#!/usr/bin/env python3
"""
Generate TypeScript constants from audio_splitter/defaults.py.
"""

import importlib.util
import json
import sys
from pathlib import Path

# Get the directory where this script is located
SCRIPT_DIR = Path(__file__).parent.absolute()

# The defaults.py is in the same directory as the script
DEFAULTS_PATH = SCRIPT_DIR / "defaults.py"

# The frontend source is at SCRIPT_DIR.parent (i.e., /app)
# The generated file should be at /app/src/constants/generated.ts
FRONTEND_ROOT = SCRIPT_DIR.parent
OUTPUT_PATH = FRONTEND_ROOT / "src" / "constants" / "generated.ts"


def load_defaults_module():
    spec = importlib.util.spec_from_file_location("defaults", DEFAULTS_PATH)
    if spec is None:
        raise RuntimeError(f"Could not load spec for {DEFAULTS_PATH}")
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module


def format_value(value):
    """Convert Python value to TypeScript literal."""
    if value is None:
        return "null"
    if isinstance(value, bool):
        return str(value).lower()
    if isinstance(value, str):
        # Use json.dumps to produce a properly escaped string literal
        return json.dumps(value)
    if isinstance(value, (int, float)):
        return str(value)
    if isinstance(value, list):
        return f"[{', '.join(format_value(v) for v in value)}]"
    return repr(value)


def main():
    print(f"Generating TypeScript defaults from {DEFAULTS_PATH}")
    defaults = load_defaults_module()

    constants = {name: value for name, value in vars(defaults).items() if name.startswith("DEFAULT_")}

    if not constants:
        print("No DEFAULT_* constants found.")
        sys.exit(1)

    lines = [
        "// ============================================================================",
        "// GENERATED FILE – DO NOT EDIT MANUALLY.",
        "// This file is generated from audio_splitter/defaults.py.",
        "// Run `npm run generate` or `python scripts/generate_ts_defaults.py` to update.",
        "// ============================================================================",
        "",
    ]

    for name, value in sorted(constants.items()):
        ts_value = format_value(value)
        lines.append(f"export const {name} = {ts_value};")

    OUTPUT_PATH.parent.mkdir(parents=True, exist_ok=True)
    OUTPUT_PATH.write_text("\n".join(lines) + "\n")

    print(f"✅ Generated {OUTPUT_PATH}")
    print(f"   {len(constants)} constants exported.")


if __name__ == "__main__":
    main()