"""Design tokens CSS generator for VoIdeaAI.

Reads docs/design-system/tokens.json and generates:
- app/design-tokens/css/tokens.css
"""

import json
from pathlib import Path

TOKENS_PATH = Path(__file__).parent.parent.parent / "docs" / "design-system" / "tokens.json"
OUTPUT_PATH = Path(__file__).parent / "css" / "tokens.css"


def load_tokens() -> dict:
    if not TOKENS_PATH.exists():
        return {}
    return json.loads(TOKENS_PATH.read_text(encoding="utf-8-sig"))


def generate_css(tokens: dict) -> str:
    lines = [
        "/* VoIdeaAI Design Tokens — auto-generated */",
        "/* Source: docs/design-system/tokens.json */",
        ":root {",
    ]

    for category, values in tokens.items():
        if not isinstance(values, dict):
            continue
        for key, value in values.items():
            if key == "$schema":
                continue
            if isinstance(value, dict):
                for mode, val in value.items():
                    if mode == "light":
                        lines.append(f"  --{category}-{key}: {val};")
            elif isinstance(value, (str, int, float)):
                lines.append(f"  --{category}-{key}: {value};")

    lines.append("}")
    lines.append("")
    lines.append(".dark {")
    for category, values in tokens.items():
        if not isinstance(values, dict):
            continue
        for key, value in values.items():
            if key == "$schema":
                continue
            if isinstance(value, dict):
                for mode, val in value.items():
                    if mode == "dark":
                        lines.append(f"  --{category}-{key}: {val};")
    lines.append("}")

    return "\n".join(lines)


def main():
    tokens = load_tokens()
    if not tokens:
        print("tokens.json not found, skipping")
        return

    OUTPUT_PATH.parent.mkdir(parents=True, exist_ok=True)
    css = generate_css(tokens)
    OUTPUT_PATH.write_text(css, encoding="utf-8")
    print(f"Generated {OUTPUT_PATH} ({len(css)} bytes)")


if __name__ == "__main__":
    main()