#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Design System Generator - Aggregates search results and applies reasoning
to generate comprehensive design system recommendations.

Usage:
    from design_system import generate_design_system
    result = generate_design_system("SaaS dashboard", "My Project")
    
    # With persistence (Master + Overrides pattern)
    result = generate_design_system("SaaS dashboard", "My Project", persist=True)
    result = generate_design_system("SaaS dashboard", "My Project", persist=True, page="dashboard")
"""

import csv
import json
import os
import sys
import io
from datetime import datetime
from pathlib import Path
from core import search, DATA_DIR

# Force UTF-8 for stdout/stderr to handle emojis/box-drawing chars on Windows (cp1252 default)
if sys.stdout.encoding and sys.stdout.encoding.lower() != 'utf-8':
    sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
if sys.stderr.encoding and sys.stderr.encoding.lower() != 'utf-8':
    sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding='utf-8')


# ============ CONFIGURATION ============
REASONING_FILE = "ui-reasoning.csv"

SEARCH_CONFIG = {
    "product": {"max_results": 1},
    "style": {"max_results": 3},
    "color": {"max_results": 2},
    "landing": {"max_results": 2},
    "typography": {"max_results": 2}
}


# ============ DESIGN SYSTEM GENERATOR ============
class DesignSystemGenerator:
    """Generates design system recommendations from aggregated searches."""

    def __init__(self):
        self.reasoning_data = self._load_reasoning()

    def _load_reasoning(self) -> list:
        """Load reasoning rules from CSV."""
        filepath = DATA_DIR / REASONING_FILE
        if not filepath.exists():
            return []
        with open(filepath, 'r', encoding='utf-8') as f:
            return list(csv.DictReader(f))

    def _multi_domain_search(self, query: str, style_priority: list = None) -> dict:
        """Execute searches across multiple domains."""
        results = {}
        for domain, config in SEARCH_CONFIG.items():
            if domain == "style" and style_priority:
                # For style, also search with priority keywords
                priority_query = " ".join(style_priority[:2]) if style_priority else query
                combined_query = f"{query} {priority_query}"
                results[domain] = search(combined_query, domain, config["max_results"])
            else:
                results[domain] = search(query, domain, config["max_results"])
        return results

    def _find_reasoning_rule(self, category: str) -> dict:
        """Find matching reasoning rule for a category."""
        category_lower = category.lower()

        # Try exact match first
        for rule in self.reasoning_data:
            if rule.get("UI_Category", "").lower() == category_lower:
                return rule

        # Try partial match
        for rule in self.reasoning_data:
            ui_cat = rule.get("UI_Category", "").lower()
            if ui_cat in category_lower or category_lower in ui_cat:
                return rule

        # Try keyword match
        for rule in self.reasoning_data:
            ui_cat = rule.get("UI_Category", "").lower()
            keywords = ui_cat.replace("/", " ").replace("-", " ").split()
            if any(kw in category_lower for kw in keywords):
                return rule

        return {}

    def _apply_reasoning(self, category: str, search_results: dict) -> dict:
        """Apply reasoning rules to search results."""
        rule = self._find_reasoning_rule(category)

        if not rule:
            return {
                "pattern": "Hero + Features + CTA",
                "style_priority": ["Minimalism", "Flat Design"],
                "color_mood": "Professional",
                "typography_mood": "Clean",
                "key_effects": "Subtle hover transitions",
                "anti_patterns": "",
                "decision_rules": {},
                "severity": "MEDIUM"
            }

        # Parse decision rules JSON
        decision_rules = {}
        try:
            decision_rules = json.loads(rule.get("Decision_Rules", "{}"))
        except json.JSONDecodeError:
            pass

        return {
            "pattern": rule.get("Recommended_Pattern", ""),
            "style_priority": [s.strip() for s in rule.get("Style_Priority", "").split("+")],
            "color_mood": rule.get("Color_Mood", ""),
            "typography_mood": rule.get("Typography_Mood", ""),
            "key_effects": rule.get("Key_Effects", ""),
            "anti_patterns": rule.get("Anti_Patterns", ""),
            "decision_rules": decision_rules,
            "severity": rule.get("Severity", "MEDIUM")
        }

    def _select_best_match(self, results: list, priority_keywords: list) -> dict:
        """Select best matching result based on priority keywords."""
        if not results:
            return {}

        if not priority_keywords:
            return results[0]

        # First: try exact style name match
        for priority in priority_keywords:
            priority_lower = priority.lower().strip()
            for result in results:
                style_name = result.get("Style Category", "").lower()
                if priority_lower in style_name or style_name in priority_lower:
                    return result

        # Second: score by keyword match in all fields
        scored = []
        for result in results:
            result_str = str(result).lower()
            score = 0
            for kw in priority_keywords:
                kw_lower = kw.lower().strip()
                # Higher score for style name match
                if kw_lower in result.get("Style Category", "").lower():
                    score += 10
                # Lower score for keyword field match
                elif kw_lower in result.get("Keywords", "").lower():
                    score += 3
                # Even lower for other field matches
                elif kw_lower in result_str:
                    score += 1
            scored.append((score, result))

        scored.sort(key=lambda x: x[0], reverse=True)
        return scored[0][1] if scored and scored[0][0] > 0 else results[0]

    def _extract_results(self, search_result: dict) -> list:
        """Extract results list from search result dict."""
        return search_result.get("results", [])

    def generate(self, query: str, project_name: str = None) -> dict:
        """Generate complete design system recommendation."""
        # Step 1: First search product to get category
        product_result = search(query, "product", 1)
        product_results = product_result.get("results", [])
        category = "General"
        if product_results:
            category = product_results[0].get("Product Type", "General")

        # Step 2: Get reasoning rules for this category
        reasoning = self._apply_reasoning(category, {})
        style_priority = reasoning.get("style_priority", [])

        # Step 3: Multi-domain search with style priority hints
        search_results = self._multi_domain_search(query, style_priority)
        search_results["product"] = product_result  # Reuse product search

        # Step 4: Select best matches from each domain using priority
        style_results = self._extract_results(search_results.get("style", {}))
        color_results = self._extract_results(search_results.get("color", {}))
        typography_results = self._extract_results(search_results.get("typography", {}))
        landing_results = self._extract_results(search_results.get("landing", {}))

        best_style = self._select_best_match(style_results, reasoning.get("style_priority", []))
        best_color = color_results[0] if color_results else {}
        best_typography = typography_results[0] if typography_results else {}
        best_landing = landing_results[0] if landing_results else {}

        # Step 5: Build final recommendation
        # Combine effects from both reasoning and style search
        style_effects = best_style.get("Effects & Animation", "")
        reasoning_effects = reasoning.get("key_effects", "")
        combined_effects = style_effects if style_effects else reasoning_effects

        return {
            "project_name": project_name or query.upper(),
            "category": category,
            "pattern": {
                "name": best_landing.get("Pattern Name", reasoning.get("pattern", "Hero + Features + CTA")),
                "sections": best_landing.get("Section Order", "Hero > Features > CTA"),
                "cta_placement": best_landing.get("Primary CTA Placement", "Above fold"),
                "color_strategy": best_landing.get("Color Strategy", ""),
                "conversion": best_landing.get("Conversion Optimization", "")
            },
            "style": {
                "name": best_style.get("Style Category", "Minimalism"),
                "type": best_style.get("Type", "General"),
                "effects": style_effects,
                "keywords": best_style.get("Keywords", ""),
                "best_for": best_style.get("Best For", ""),
                "performance": best_style.get("Performance", ""),
                "accessibility": best_style.get("Accessibility", ""),
                "light_mode": best_style.get("Light Mode ✓", ""),
                "dark_mode": best_style.get("Dark Mode ✓", ""),
            },
            "colors": {
                "primary": best_color.get("Primary", "#2563EB"),
                "on_primary": best_color.get("On Primary", ""),
                "secondary": best_color.get("Secondary", "#3B82F6"),
                "accent": best_color.get("Accent", "#F97316"),
                "background": best_color.get("Background", "#F8FAFC"),
                "foreground": best_color.get("Foreground", "#1E293B"),
                "muted": best_color.get("Muted", ""),
                "border": best_color.get("Border", ""),
                "destructive": best_color.get("Destructive", ""),
                "ring": best_color.get("Ring", ""),
                "notes": best_color.get("Notes", ""),
                # Keep legacy keys for backward compat in MASTER.md
                "cta": best_color.get("Accent", "#F97316"),
                "text": best_color.get("Foreground", "#1E293B"),
            },
            "typography": {
                "heading": best_typography.get("Heading Font", "Inter"),
                "body": best_typography.get("Body Font", "Inter"),
                "mood": best_typography.get("Mood/Style Keywords", reasoning.get("typography_mood", "")),
                "best_for": best_typography.get("Best For", ""),
                "google_fonts_url": best_typography.get("Google Fonts URL", ""),
                "css_import": best_typography.get("CSS Import", "")
            },
            "key_effects": combined_effects,
            "anti_patterns": reasoning.get("anti_patterns", ""),
            "decision_rules": reasoning.get("decision_rules", {}),
            "severity": reasoning.get("severity", "MEDIUM")
        }


# ============ OUTPUT FORMATTERS ============
BOX_WIDTH = 90  # Wider box for more content


def hex_to_ansi(hex_color: str) -> str:
    """Convert hex color to ANSI True Color swatch (██) with fallback."""
    if not hex_color or not hex_color.startswith('#'):
        return ""
    colorterm = os.environ.get('COLORTERM', '')
    if colorterm not in ('truecolor', '24bit'):
        return ""
    hex_color = hex_color.lstrip('#')
    if len(hex_color) != 6:
        return ""
    r, g, b = int(hex_color[0:2], 16), int(hex_color[2:4], 16), int(hex_color[4:6], 16)
    return f"\033[38;2;{r};{g};{b}m██\033[0m "


def ansi_ljust(s: str, width: int) -> str:
    """Like str.ljust but accounts for zero-width ANSI escape sequences."""
    import re
    visible_len = len(re.sub(r'\033\[[0-9;]*m', '', s))
    pad = width - visible_len
    return s + (" " * max(0, pad))


def section_header(name: str, width: int) -> str:
    """Create a Unicode section separator: ├─── NAME ───...┤"""
    label = f"─── {name} "
    fill = "─" * (width - len(label) - 1)
    return f"├{label}{fill}┤"


def format_ascii_box(design_system: dict) -> str:
    """Format design system as Unicode box with ANSI color swatches."""
    project = design_system.get("project_name", "PROJECT")
    pattern = design_system.get("pattern", {})
    style = design_system.get("style", {})
    colors = design_system.get("colors", {})
    typography = design_system.get("typography", {})
    effects = design_system.get("key_effects", "")
    anti_patterns = design_system.get("anti_patterns", "")

    def wrap_text(text: str, prefix: str, width: int) -> list:
        """Wrap long text into multiple lines."""
        if not text:
            return []
        words = text.split()
        lines = []
        current_line = prefix
        for word in words:
            if len(current_line) + len(word) + 1 <= width - 2:
                current_line += (" " if current_line != prefix else "") + word
            else:
                if current_line != prefix:
                    lines.append(current_line)
                current_line = prefix + word
        if current_line != prefix:
            lines.append(current_line)
        return lines

    # Build sections from pattern
    sections = pattern.get("sections", "").split(">")
    sections = [s.strip() for s in sections if s.strip()]

    # Build output lines
    lines = []
    w = BOX_WIDTH - 1

    # Header with double-line box
    lines.append("╔" + "═" * w + "╗")
    lines.append(ansi_ljust(f"║  TARGET: {project} - RECOMMENDED DESIGN SYSTEM", BOX_WIDTH) + "║")
    lines.append("╚" + "═" * w + "╝")
    lines.append("┌" + "─" * w + "┐")

    # Pattern section
    lines.append(section_header("PATTERN", BOX_WIDTH + 1))
    lines.append(f"│  Name: {pattern.get('name', '')}".ljust(BOX_WIDTH) + "│")
    if pattern.get('conversion'):
        lines.append(f"│     Conversion: {pattern.get('conversion', '')}".ljust(BOX_WIDTH) + "│")
    if pattern.get('cta_placement'):
        lines.append(f"│     CTA: {pattern.get('cta_placement', '')}".ljust(BOX_WIDTH) + "│")
    lines.append("│     Sections:".ljust(BOX_WIDTH) + "│")
    for i, section in enumerate(sections, 1):
        lines.append(f"│       {i}. {section}".ljust(BOX_WIDTH) + "│")

    # Style section
    lines.append(section_header("STYLE", BOX_WIDTH + 1))
    lines.append(f"│  Name: {style.get('name', '')}".ljust(BOX_WIDTH) + "│")
    light = style.get("light_mode", "")
    dark = style.get("dark_mode", "")
    if light or dark:
        lines.append(f"│     Mode Support: Light {light}  Dark {dark}".ljust(BOX_WIDTH) + "│")
    if style.get("keywords"):
        for line in wrap_text(f"Keywords: {style.get('keywords', '')}", "│     ", BOX_WIDTH):
            lines.append(line.ljust(BOX_WIDTH) + "│")
    if style.get("best_for"):
        for line in wrap_text(f"Best For: {style.get('best_for', '')}", "│     ", BOX_WIDTH):
            lines.append(line.ljust(BOX_WIDTH) + "│")
    if style.get("performance") or style.get("accessibility"):
        perf_a11y = f"Performance: {style.get('performance', '')} | Accessibility: {style.get('accessibility', '')}"
        lines.append(f"│     {perf_a11y}".ljust(BOX_WIDTH) + "│")

    # Colors section (extended palette with ANSI swatches)
    lines.append(section_header("COLORS", BOX_WIDTH + 1))
    color_entries = [
        ("Primary",      "primary",      "--color-primary"),
        ("On Primary",   "on_primary",   "--color-on-primary"),
        ("Secondary",    "secondary",    "--color-secondary"),
        ("Accent/CTA",   "accent",       "--color-accent"),
        ("Background",   "background",   "--color-background"),
        ("Foreground",   "foreground",   "--color-foreground"),
        ("Muted",        "muted",        "--color-muted"),
        ("Border",       "border",       "--color-border"),
        ("Destructive",  "destructive",  "--color-destructive"),
        ("Ring",         "ring",         "--color-ring"),
    ]
    for label, key, css_var in color_entries:
        hex_val = colors.get(key, "")
        if not hex_val:
            continue
        swatch = hex_to_ansi(hex_val)
        content = f"│     {swatch}{label + ':':14s} {hex_val:10s} ({css_var})"
        lines.append(ansi_ljust(content, BOX_WIDTH) + "│")
    if colors.get("notes"):
        for line in wrap_text(f"Notes: {colors.get('notes', '')}", "│     ", BOX_WIDTH):
            lines.append(line.ljust(BOX_WIDTH) + "│")

    # Typography section
    lines.append(section_header("TYPOGRAPHY", BOX_WIDTH + 1))
    lines.append(f"│  {typography.get('heading', '')} / {typography.get('body', '')}".ljust(BOX_WIDTH) + "│")
    if typography.get("mood"):
        for line in wrap_text(f"Mood: {typography.get('mood', '')}", "│     ", BOX_WIDTH):
            lines.append(line.ljust(BOX_WIDTH) + "│")
    if typography.get("best_for"):
        for line in wrap_text(f"Best For: {typography.get('best_for', '')}", "│     ", BOX_WIDTH):
            lines.append(line.ljust(BOX_WIDTH) + "│")
    if typography.get("google_fonts_url"):
        lines.append(f"│     Google Fonts: {typography.get('google_fonts_url', '')}".ljust(BOX_WIDTH) + "│")
    if typography.get("css_import"):
        lines.append(f"│     CSS Import: {typography.get('css_import', '')[:70]}...".ljust(BOX_WIDTH) + "│")

    # Key Effects section
    if effects:
        lines.append(section_header("KEY EFFECTS", BOX_WIDTH + 1))
        for line in wrap_text(effects, "│     ", BOX_WIDTH):
            lines.append(line.ljust(BOX_WIDTH) + "│")

    # Anti-patterns section
    if anti_patterns:
        lines.append(section_header("AVOID", BOX_WIDTH + 1))
        for line in wrap_text(anti_patterns, "│     ", BOX_WIDTH):
            lines.append(line.ljust(BOX_WIDTH) + "│")

    # Pre-Delivery Checklist section
    lines.append(section_header("PRE-DELIVERY CHECKLIST", BOX_WIDTH + 1))
    checklist_items = [
        "[ ] No emojis as icons (use SVG: Heroicons/Lucide)",
        "[ ] cursor-pointer on all clickable elements",
        "[ ] Hover states with smooth transitions (150-300ms)",
        "[ ] Light mode: text contrast 4.5:1 minimum",
        "[ ] Focus states visible for keyboard nav",
        "[ ] prefers-reduced-motion respected",
        "[ ] Responsive: 375px, 768px, 1024px, 1440px"
    ]
    for item in checklist_items:
        lines.append(f"│     {item}".ljust(BOX_WIDTH) + "│")

    lines.append("└" + "─" * w + "┘")

    return "\n".join(lines)


def format_markdown(design_system: dict) -> str:
    """Format design system as markdown."""
    project = design_system.get("project_name", "PROJECT")
    pattern = design_system.get("pattern", {})
    style = design_system.get("style", {})
    colors = design_system.get("colors", {})
    typography = design_system.get("typography", {})
    effects = design_system.get("key_effects", "")
    anti_patterns = design_system.get("anti_patterns", "")

    lines = []
    lines.append(f"## Design System: {project}")
    lines.append("")

    # Pattern section
    lines.append("### Pattern")
    lines.append(f"- **Name:** {pattern.get('name', '')}")
    if pattern.get('conversion'):
        lines.append(f"- **Conversion Focus:** {pattern.get('conversion', '')}")
    if pattern.get('cta_placement'):
        lines.append(f"- **CTA Placement:** {pattern.get('cta_placement', '')}")
    if pattern.get('color_strategy'):
        lines.append(f"- **Color Strategy:** {pattern.get('color_strategy', '')}")
    lines.append(f"- **Sections:** {pattern.get('sections', '')}")
    lines.append("")

    # Style section
    lines.append("### Style")
    lines.append(f"- **Name:** {style.get('name', '')}")
    light = style.get("light_mode", "")
    dark = style.get("dark_mode", "")
    if light or dark:
        lines.append(f"- **Mode Support:** Light {light} | Dark {dark}")
    if style.get('keywords'):
        lines.append(f"- **Keywords:** {style.get('keywords', '')}")
    if style.get('best_for'):
        lines.append(f"- **Best For:** {style.get('best_for', '')}")
    if style.get('performance') or style.get('accessibility'):
        lines.append(f"- **Performance:** {style.get('performance', '')} | **Accessibility:** {style.get('accessibility', '')}")
    lines.append("")

    # Colors section (extended palette)
    lines.append("### Colors")
    lines.append("| Role | Hex | CSS Variable |")
    lines.append("|------|-----|--------------|")
    md_color_entries = [
        ("Primary",      "primary",      "--color-primary"),
        ("On Primary",   "on_primary",   "--color-on-primary"),
        ("Secondary",    "secondary",    "--color-secondary"),
        ("Accent/CTA",   "accent",       "--color-accent"),
        ("Background",   "background",   "--color-background"),
        ("Foreground",   "foreground",   "--color-foreground"),
        ("Muted",        "muted",        "--color-muted"),
        ("Border",       "border",       "--color-border"),
        ("Destructive",  "destructive",  "--color-destructive"),
        ("Ring",         "ring",         "--color-ring"),
    ]
    for label, key, css_var in md_color_entries:
        hex_val = colors.get(key, "")
        if hex_val:
            lines.append(f"| {label} | `{hex_val}` | `{css_var}` |")
    if colors.get("notes"):
        lines.append(f"\n*Notes: {colors.get('notes', '')}*")
    lines.append("")

    # Typography section
    lines.append("### Typography")
    lines.append(f"- **Heading:** {typography.get('heading', '')}")
    lines.append(f"- **Body:** {typography.get('body', '')}")
    if typography.get("mood"):
        lines.append(f"- **Mood:** {typography.get('mood', '')}")
    if typography.get("best_for"):
        lines.append(f"- **Best For:** {typography.get('best_for', '')}")
    if typography.get("google_fonts_url"):
        lines.append(f"- **Google Fonts:** {typography.get('google_fonts_url', '')}")
    if typography.get("css_import"):
        lines.append(f"- **CSS Import:**")
        lines.append(f"```css")
        lines.append(f"{typography.get('css_import', '')}")
        lines.append(f"```")
    lines.append("")

    # Key Effects section
    if effects:
        lines.append("### Key Effects")
        lines.append(f"{effects}")
        lines.append("")

    # Anti-patterns section
    if anti_patterns:
        lines.append("### Avoid (Anti-patterns)")
        newline_bullet = '\n- '
        lines.append(f"- {anti_patterns.replace(' + ', newline_bullet)}")
        lines.append("")

    # Pre-Delivery Checklist section
    lines.append("### Pre-Delivery Checklist")
    lines.append("- [ ] No emojis as icons (use SVG: Heroicons/Lucide)")
    lines.append("- [ ] cursor-pointer on all clickable elements")
    lines.append("- [ ] Hover states with smooth transitions (150-300ms)")
    lines.append("- [ ] Light mode: text contrast 4.5:1 minimum")
    lines.append("- [ ] Focus states visible for keyboard nav")
    lines.append("- [ ] prefers-reduced-motion respected")
    lines.append("- [ ] Responsive: 375px, 768px, 1024px, 1440px")
    lines.append("")

    return "\n".join(lines)


# ============ MAIN ENTRY POINT ============
def generate_design_system(query: str, project_name: str = None, output_format: str = "ascii", 
                           persist: bool = False, page: str = None, output_dir: str = None) -> str:
    """
    Main entry point for design system generation.

    Args:
        query: Search query (e.g., "SaaS dashboard", "e-commerce luxury")
        project_name: Optional project name for output header
        output_format: "ascii" (default) or "markdown"
        persist: If True, save design system to design-system/ folder
        page: Optional page name for page-specific override file
        output_dir: Optional output directory (defaults to current working directory)

    Returns:
        Formatted design system string
    """
    generator = DesignSystemGenerator()
    design_system = generator.generate(query, project_name)
    
    # Persist to files if requested
    if persist:
        persist_design_system(design_system, page, output_dir, query)

    if output_format == "markdown":
        return format_markdown(design_system)
    return format_ascii_box(design_system)


# ============ PERSISTENCE FUNCTIONS ============
def persist_design_system(design_system: dict, page: str = None, output_dir: str = None, page_query: str = None) -> dict:
    """
    Persist design system to design-system/<project>/ folder using Master + Overrides pattern.
    
    Args:
        design_system: The generated design system dictionary
        page: Optional page name for page-specific override file
        output_dir: Optional output directory (defaults to current working directory)
        page_query: Optional query string for intelligent page override generation
    
    Returns:
        dict with created file paths and status
    """
    base_dir = Path(output_dir) if output_dir else Path.cwd()
    
    # Use project name for project-specific folder. Coalesce falsy values
    # (missing key, explicit None, or "") so the .lower() below can't crash.
    project_name = design_system.get("project_name") or "default"
    project_slug = project_name.lower().replace(' ', '-')
    
    design_system_dir = base_dir / "design-system" / project_slug
    pages_dir = design_system_dir / "pages"
    
    created_files = []
    
    # Create directories
    design_system_dir.mkdir(parents=True, exist_ok=True)
    pages_dir.mkdir(parents=True, exist_ok=True)
    
    master_file = design_system_dir / "MASTER.md"
    
    # Generate and write MASTER.md
    master_content = format_master_md(design_system)
    with open(master_file, 'w', encoding='utf-8') as f:
        f.write(master_content)
    created_files.append(str(master_file))
    
    # If page is specified, create page override file with intelligent content
    if page:
        page_file = pages_dir / f"{page.lower().replace(' ', '-')}.md"
        page_content = format_page_override_md(design_system, page, page_query)
        with open(page_file, 'w', encoding='utf-8') as f:
            f.write(page_content)
        created_files.append(str(page_file))
    
    return {
        "status": "success",
        "design_system_dir": str(design_system_dir),
        "created_files": created_files
    }


def format_master_md(design_system: dict) -> str:
    """Format design system as MASTER.md with hierarchical override logic."""
    project = design_system.get("project_name", "PROJECT")
    pattern = design_system.get("pattern", {})
    style = design_system.get("style", {})
    colors = design_system.get("colors", {})
    typography = design_system.get("typography", {})
    effects = design_system.get("key_effects", "")
    anti_patterns = design_system.get("anti_patterns", "")
    
    timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    
    lines = []
    
    # Logic header
    lines.append("# Design System Master File")
    lines.append("")
    lines.append("> **LOGIC:** When building a specific page, first check `design-system/pages/[page-name].md`.")
    lines.append("> If that file exists, its rules **override** this Master file.")
    lines.append("> If not, strictly follow the rules below.")
    lines.append("")
    lines.append("---")
    lines.append("")
    lines.append(f"**Project:** {project}")
    lines.append(f"**Generated:** {timestamp}")
    lines.append(f"**Category:** {design_system.get('category', 'General')}")
    lines.append("")
    lines.append("---")
    lines.append("")
    
    # Global Rules section
    lines.append("## Global Rules")
    lines.append("")
    
    # Color Palette
    lines.append("### Color Palette")
    lines.append("")
    lines.append("| Role | Hex | CSS Variable |")
    lines.append("|------|-----|--------------|")
    master_color_entries = [
        ("Primary",      "primary",      "--color-primary"),
        ("On Primary",   "on_primary",   "--color-on-primary"),
        ("Secondary",    "secondary",    "--color-secondary"),
        ("Accent/CTA",   "accent",       "--color-accent"),
        ("Background",   "background",   "--color-background"),
        ("Foreground",   "foreground",   "--color-foreground"),
        ("Muted",        "muted",        "--color-muted"),
        ("Border",       "border",       "--color-border"),
        ("Destructive",  "destructive",  "--color-destructive"),
        ("Ring",         "ring",         "--color-ring"),
    ]
    for label, key, css_var in master_color_entries:
        hex_val = colors.get(key, "")
        if hex_val:
            lines.append(f"| {label} | `{hex_val}` | `{css_var}` |")
    lines.append("")
    if colors.get("notes"):
        lines.append(f"**Color Notes:** {colors.get('notes', '')}")
        lines.append("")
    
    # Typography
    lines.append("### Typography")
    lines.append("")
    lines.append(f"- **Heading Font:** {typography.get('heading', 'Inter')}")
    lines.append(f"- **Body Font:** {typography.get('body', 'Inter')}")
    if typography.get("mood"):
        lines.append(f"- **Mood:** {typography.get('mood', '')}")
    if typography.get("google_fonts_url"):
        lines.append(f"- **Google Fonts:** [{typography.get('heading', '')} + {typography.get('body', '')}]({typography.get('google_fonts_url', '')})")
    lines.append("")
    if typography.get("css_import"):
        lines.append("**CSS Import:**")
        lines.append("```css")
        lines.append(typography.get("css_import", ""))
        lines.append("```")
        lines.append("")
    
    # Spacing Variables
    lines.append("### Spacing Variables")
    lines.append("")
    lines.append("| Token | Value | Usage |")
    lines.append("|-------|-------|-------|")
    lines.append("| `--space-xs` | `4px` / `0.25rem` | Tight gaps |")
    lines.append("| `--space-sm` | `8px` / `0.5rem` | Icon gaps, inline spacing |")
    lines.append("| `--space-md` | `16px` / `1rem` | Standard padding |")
    lines.append("| `--space-lg` | `24px` / `1.5rem` | Section padding |")
    lines.append("| `--space-xl` | `32px` / `2rem` | Large gaps |")
    lines.append("| `--space-2xl` | `48px` / `3rem` | Section margins |")
    lines.append("| `--space-3xl` | `64px` / `4rem` | Hero padding |")
    lines.append("")
    
    # Shadow Depths
    lines.append("### Shadow Depths")
    lines.append("")
    lines.append("| Level | Value | Usage |")
    lines.append("|-------|-------|-------|")
    lines.append("| `--shadow-sm` | `0 1px 2px rgba(0,0,0,0.05)` | Subtle lift |")
    lines.append("| `--shadow-md` | `0 4px 6px rgba(0,0,0,0.1)` | Cards, buttons |")
    lines.append("| `--shadow-lg` | `0 10px 15px rgba(0,0,0,0.1)` | Modals, dropdowns |")
    lines.append("| `--shadow-xl` | `0 20px 25px rgba(0,0,0,0.15)` | Hero images, featured cards |")
    lines.append("")
    
    # Component Specs section
    lines.append("---")
    lines.append("")
    lines.append("## Component Specs")
    lines.append("")
    
    # Buttons
    lines.append("### Buttons")
    lines.append("")
    lines.append("```css")
    lines.append("/* Primary Button */")
    lines.append(".btn-primary {")
    lines.append(f"  background: {colors.get('cta', '#F97316')};")
    lines.append("  color: white;")
    lines.append("  padding: 12px 24px;")
    lines.append("  border-radius: 8px;")
    lines.append("  font-weight: 600;")
    lines.append("  transition: all 200ms ease;")
    lines.append("  cursor: pointer;")
    lines.append("}")
    lines.append("")
    lines.append(".btn-primary:hover {")
    lines.append("  opacity: 0.9;")
    lines.append("  transform: translateY(-1px);")
    lines.append("}")
    lines.append("")
    lines.append("/* Secondary Button */")
    lines.append(".btn-secondary {")
    lines.append(f"  background: transparent;")
    lines.append(f"  color: {colors.get('primary', '#2563EB')};")
    lines.append(f"  border: 2px solid {colors.get('primary', '#2563EB')};")
    lines.append("  padding: 12px 24px;")
    lines.append("  border-radius: 8px;")
    lines.append("  font-weight: 600;")
    lines.append("  transition: all 200ms ease;")
    lines.append("  cursor: pointer;")
    lines.append("}")
    lines.append("```")
    lines.append("")
    
    # Cards
    lines.append("### Cards")
    lines.append("")
    lines.append("```css")
    lines.append(".card {")
    lines.append(f"  background: {colors.get('background', '#FFFFFF')};")
    lines.append("  border-radius: 12px;")
    lines.append("  padding: 24px;")
    lines.append("  box-shadow: var(--shadow-md);")
    lines.append("  transition: all 200ms ease;")
    lines.append("  cursor: pointer;")
    lines.append("}")
    lines.append("")
    lines.append(".card:hover {")
    lines.append("  box-shadow: var(--shadow-lg);")
    lines.append("  transform: translateY(-2px);")
    lines.append("}")
    lines.append("```")
    lines.append("")
    
    # Inputs
    lines.append("### Inputs")
    lines.append("")
    lines.append("```css")
    lines.append(".input {")
    lines.append("  padding: 12px 16px;")
    lines.append("  border: 1px solid #E2E8F0;")
    lines.append("  border-radius: 8px;")
    lines.append("  font-size: 16px;")
    lines.append("  transition: border-color 200ms ease;")
    lines.append("}")
    lines.append("")
    lines.append(".input:focus {")
    lines.append(f"  border-color: {colors.get('primary', '#2563EB')};")
    lines.append("  outline: none;")
    lines.append(f"  box-shadow: 0 0 0 3px {colors.get('primary', '#2563EB')}20;")
    lines.append("}")
    lines.append("```")
    lines.append("")
    
    # Modals
    lines.append("### Modals")
    lines.append("")
    lines.append("```css")
    lines.append(".modal-overlay {")
    lines.append("  background: rgba(0, 0, 0, 0.5);")
    lines.append("  backdrop-filter: blur(4px);")
    lines.append("}")
    lines.append("")
    lines.append(".modal {")
    lines.append("  background: white;")
    lines.append("  border-radius: 16px;")
    lines.append("  padding: 32px;")
    lines.append("  box-shadow: var(--shadow-xl);")
    lines.append("  max-width: 500px;")
    lines.append("  width: 90%;")
    lines.append("}")
    lines.append("```")
    lines.append("")
    
    # Style section
    lines.append("---")
    lines.append("")
    lines.append("## Style Guidelines")
    lines.append("")
    lines.append(f"**Style:** {style.get('name', 'Minimalism')}")
    lines.append("")
    if style.get("keywords"):
        lines.append(f"**Keywords:** {style.get('keywords', '')}")
        lines.append("")
    if style.get("best_for"):
        lines.append(f"**Best For:** {style.get('best_for', '')}")
        lines.append("")
    if effects:
        lines.append(f"**Key Effects:** {effects}")
        lines.append("")
    
    # Layout Pattern
    lines.append("### Page Pattern")
    lines.append("")
    lines.append(f"**Pattern Name:** {pattern.get('name', '')}")
    lines.append("")
    if pattern.get('conversion'):
        lines.append(f"- **Conversion Strategy:** {pattern.get('conversion', '')}")
    if pattern.get('cta_placement'):
        lines.append(f"- **CTA Placement:** {pattern.get('cta_placement', '')}")
    lines.append(f"- **Section Order:** {pattern.get('sections', '')}")
    lines.append("")
    
    # Anti-Patterns section
    lines.append("---")
    lines.append("")
    lines.append("## Anti-Patterns (Do NOT Use)")
    lines.append("")
    if anti_patterns:
        anti_list = [a.strip() for a in anti_patterns.split("+")]
        for anti in anti_list:
            if anti:
                lines.append(f"- ❌ {anti}")
    lines.append("")
    lines.append("### Additional Forbidden Patterns")
    lines.append("")
    lines.append("- ❌ **Emojis as icons** — Use SVG icons (Heroicons, Lucide, Simple Icons)")
    lines.append("- ❌ **Missing cursor:pointer** — All clickable elements must have cursor:pointer")
    lines.append("- ❌ **Layout-shifting hovers** — Avoid scale transforms that shift layout")
    lines.append("- ❌ **Low contrast text** — Maintain 4.5:1 minimum contrast ratio")
    lines.append("- ❌ **Instant state changes** — Always use transitions (150-300ms)")
    lines.append("- ❌ **Invisible focus states** — Focus states must be visible for a11y")
    lines.append("")
    
    # Pre-Delivery Checklist
    lines.append("---")
    lines.append("")
    lines.append("## Pre-Delivery Checklist")
    lines.append("")
    lines.append("Before delivering any UI code, verify:")
    lines.append("")
    lines.append("- [ ] No emojis used as icons (use SVG instead)")
    lines.append("- [ ] All icons from consistent icon set (Heroicons/Lucide)")
    lines.append("- [ ] `cursor-pointer` on all clickable elements")
    lines.append("- [ ] Hover states with smooth transitions (150-300ms)")
    lines.append("- [ ] Light mode: text contrast 4.5:1 minimum")
    lines.append("- [ ] Focus states visible for keyboard navigation")
    lines.append("- [ ] `prefers-reduced-motion` respected")
    lines.append("- [ ] Responsive: 375px, 768px, 1024px, 1440px")
    lines.append("- [ ] No content hidden behind fixed navbars")
    lines.append("- [ ] No horizontal scroll on mobile")
    lines.append("")
    
    return "\n".join(lines)


def format_page_override_md(design_system: dict, page_name: str, page_query: str = None) -> str:
    """Format a page-specific override file with intelligent AI-generated content."""
    project = design_system.get("project_name", "PROJECT")
    timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    page_title = page_name.replace("-", " ").replace("_", " ").title()
    
    # Detect page type and generate intelligent overrides
    page_overrides = _generate_intelligent_overrides(page_name, page_query, design_system)
    
    lines = []
    
    lines.append(f"# {page_title} Page Overrides")
    lines.append("")
    lines.append(f"> **PROJECT:** {project}")
    lines.append(f"> **Generated:** {timestamp}")
    lines.append(f"> **Page Type:** {page_overrides.get('page_type', 'General')}")
    lines.append("")
    lines.append("> ⚠️ **IMPORTANT:** Rules in this file **override** the Master file (`design-system/MASTER.md`).")
    lines.append("> Only deviations from the Master are documented here. For all other rules, refer to the Master.")
    lines.append("")
    lines.append("---")
    lines.append("")
    
    # Page-specific rules with actual content
    lines.append("## Page-Specific Rules")
    lines.append("")
    
    # Layout Overrides
    lines.append("### Layout Overrides")
    lines.append("")
    layout = page_overrides.get("layout", {})
    if layout:
        for key, value in layout.items():
            lines.append(f"- **{key}:** {value}")
    else:
        lines.append("- No overrides — use Master layout")
    lines.append("")
    
    # Spacing Overrides
    lines.append("### Spacing Overrides")
    lines.append("")
    spacing = page_overrides.get("spacing", {})
    if spacing:
        for key, value in spacing.items():
            lines.append(f"- **{key}:** {value}")
    else:
        lines.append("- No overrides — use Master spacing")
    lines.append("")
    
    # Typography Overrides
    lines.append("### Typography Overrides")
    lines.append("")
    typography = page_overrides.get("typography", {})
    if typography:
        for key, value in typography.items():
            lines.append(f"- **{key}:** {value}")
    else:
        lines.append("- No overrides — use Master typography")
    lines.append("")
    
    # Color Overrides
    lines.append("### Color Overrides")
    lines.append("")
    colors = page_overrides.get("colors", {})
    if colors:
        for key, value in colors.items():
            lines.append(f"- **{key}:** {value}")
    else:
        lines.append("- No overrides — use Master colors")
    lines.append("")
    
    # Component Overrides
    lines.append("### Component Overrides")
    lines.append("")
    components = page_overrides.get("components", [])
    if components:
        for comp in components:
            lines.append(f"- {comp}")
    else:
        lines.append("- No overrides — use Master component specs")
    lines.append("")
    
    # Page-Specific Components
    lines.append("---")
    lines.append("")
    lines.append("## Page-Specific Components")
    lines.append("")
    unique_components = page_overrides.get("unique_components", [])
    if unique_components:
        for comp in unique_components:
            lines.append(f"- {comp}")
    else:
        lines.append("- No unique components for this page")
    lines.append("")
    
    # Recommendations
    lines.append("---")
    lines.append("")
    lines.append("## Recommendations")
    lines.append("")
    recommendations = page_overrides.get("recommendations", [])
    if recommendations:
        for rec in recommendations:
            lines.append(f"- {rec}")
    lines.append("")
    
    return "\n".join(lines)


def _generate_intelligent_overrides(page_name: str, page_query: str, design_system: dict) -> dict:
    """
    Generate intelligent overrides based on page type using layered search.
    
    Uses the existing search infrastructure to find relevant style, UX, and layout
    data instead of hardcoded page types.
    """
    from core import search
    
    page_lower = page_name.lower()
    query_lower = (page_query or "").lower()
    combined_context = f"{page_lower} {query_lower}"
    
    # Search across multiple domains for page-specific guidance
    style_search = search(combined_context, "style", max_results=1)
    ux_search = search(combined_context, "ux", max_results=3)
    landing_search = search(combined_context, "landing", max_results=1)
    
    # Extract results from search response
    style_results = style_search.get("results", [])
    ux_results = ux_search.get("results", [])
    landing_results = landing_search.get("results", [])
    
    # Detect page type from search results or context
    page_type = _detect_page_type(combined_context, style_results)
    
    # Build overrides from search results
    layout = {}
    spacing = {}
    typography = {}
    colors = {}
    components = []
    unique_components = []
    recommendations = []
    
    # Extract style-based overrides
    if style_results:
        style = style_results[0]
        style_name = style.get("Style Category", "")
        keywords = style.get("Keywords", "")
        best_for = style.get("Best For", "")
        effects = style.get("Effects & Animation", "")
        
        # Infer layout from style keywords
        if any(kw in keywords.lower() for kw in ["data", "dense", "dashboard", "grid"]):
            layout["Max Width"] = "1400px or full-width"
            layout["Grid"] = "12-column grid for data flexibility"
            spacing["Content Density"] = "High — optimize for information display"
        elif any(kw in keywords.lower() for kw in ["minimal", "simple", "clean", "single"]):
            layout["Max Width"] = "800px (narrow, focused)"
            layout["Layout"] = "Single column, centered"
            spacing["Content Density"] = "Low — focus on clarity"
        else:
            layout["Max Width"] = "1200px (standard)"
            layout["Layout"] = "Full-width sections, centered content"
        
        if effects:
            recommendations.append(f"Effects: {effects}")
    
    # Extract UX guidelines as recommendations
    for ux in ux_results:
        category = ux.get("Category", "")
        do_text = ux.get("Do", "")
        dont_text = ux.get("Don't", "")
        if do_text:
            recommendations.append(f"{category}: {do_text}")
        if dont_text:
            components.append(f"Avoid: {dont_text}")
    
    # Extract landing pattern info for section structure
    if landing_results:
        landing = landing_results[0]
        sections = landing.get("Section Order", "")
        cta_placement = landing.get("Primary CTA Placement", "")
        color_strategy = landing.get("Color Strategy", "")
        
        if sections:
            layout["Sections"] = sections
        if cta_placement:
            recommendations.append(f"CTA Placement: {cta_placement}")
        if color_strategy:
            colors["Strategy"] = color_strategy
    
    # Add page-type specific defaults if no search results
    if not layout:
        layout["Max Width"] = "1200px"
        layout["Layout"] = "Responsive grid"
    
    if not recommendations:
        recommendations = [
            "Refer to MASTER.md for all design rules",
            "Add specific overrides as needed for this page"
        ]
    
    return {
        "page_type": page_type,
        "layout": layout,
        "spacing": spacing,
        "typography": typography,
        "colors": colors,
        "components": components,
        "unique_components": unique_components,
        "recommendations": recommendations
    }


def _detect_page_type(context: str, style_results: list) -> str:
    """Detect page type from context and search results."""
    context_lower = context.lower()
    
    # Check for common page type patterns
    page_patterns = [
        (["dashboard", "admin", "analytics", "data", "metrics", "stats", "monitor", "overview"], "Dashboard / Data View"),
        (["checkout", "payment", "cart", "purchase", "order", "billing"], "Checkout / Payment"),
        (["settings", "profile", "account", "preferences", "config"], "Settings / Profile"),
        (["landing", "marketing", "homepage", "hero", "home", "promo"], "Landing / Marketing"),
        (["login", "signin", "signup", "register", "auth", "password"], "Authentication"),
        (["pricing", "plans", "subscription", "tiers", "packages"], "Pricing / Plans"),
        (["blog", "article", "post", "news", "content", "story"], "Blog / Article"),
        (["product", "item", "detail", "pdp", "shop", "store"], "Product Detail"),
        (["search", "results", "browse", "filter", "catalog", "list"], "Search Results"),
        (["empty", "404", "error", "not found", "zero"], "Empty State"),
    ]
    
    for keywords, page_type in page_patterns:
        if any(kw in context_lower for kw in keywords):
            return page_type
    
    # Fallback: try to infer from style results
    if style_results:
        style_name = style_results[0].get("Style Category", "").lower()
        best_for = style_results[0].get("Best For", "").lower()
        
        if "dashboard" in best_for or "data" in best_for:
            return "Dashboard / Data View"
        elif "landing" in best_for or "marketing" in best_for:
            return "Landing / Marketing"
    
    return "General"


# ============ CLI SUPPORT ============
if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(description="Generate Design System")
    parser.add_argument("query", help="Search query (e.g., 'SaaS dashboard')")
    parser.add_argument("--project-name", "-p", type=str, default=None, help="Project name")
    parser.add_argument("--format", "-f", choices=["ascii", "markdown"], default="ascii", help="Output format")

    args = parser.parse_args()

    result = generate_design_system(args.query, args.project_name, args.format)
    print(result)
