#!/usr/bin/env python3
"""Validate a registry tool submission.

Usage: python scripts/validate_tool.py path/to/tool
"""

from __future__ import annotations

import re
import sys
from pathlib import Path
from typing import List

import yaml

TOOL_NAME_RE = re.compile(r"^[A-Za-z0-9-]{1,64}$")
SEMVER_RE = re.compile(r"^(\d+)\.(\d+)\.(\d+)(?:-[0-9A-Za-z.-]+)?(?:\+.+)?$")

REQUIRED_README_SECTIONS = ["## Usage", "## Examples"]


def find_repo_root(start: Path) -> Path | None:
    current = start.resolve()
    while current != current.parent:
        if (current / "categories" / "categories.yaml").exists():
            return current
        current = current.parent
    if (current / "categories" / "categories.yaml").exists():
        return current
    return None


def load_categories(repo_root: Path) -> List[str]:
    categories_path = repo_root / "categories" / "categories.yaml"
    data = yaml.safe_load(categories_path.read_text(encoding="utf-8")) or {}
    categories = data.get("categories", [])
    return [c.get("name") for c in categories if c.get("name")]


def validate_tool(tool_path: Path) -> List[str]:
    errors: List[str] = []
    if tool_path.is_dir():
        config_path = tool_path / "config.yaml"
        readme_path = tool_path / "README.md"
    else:
        config_path = tool_path
        readme_path = tool_path.parent / "README.md"

    if not config_path.exists():
        return [f"Missing config.yaml at {config_path}"]

    try:
        config_text = config_path.read_text(encoding="utf-8")
        data = yaml.safe_load(config_text) or {}
    except Exception as exc:
        return [f"Invalid YAML in config.yaml: {exc}"]

    name = (data.get("name") or "").strip()
    version = (data.get("version") or "").strip()
    description = (data.get("description") or "").strip()
    category = (data.get("category") or "").strip()

    if not name:
        errors.append("Missing required field: name")
    elif not TOOL_NAME_RE.match(name):
        errors.append("Tool name must match ^[A-Za-z0-9-]{1,64}$")

    if not version:
        errors.append("Missing required field: version")
    elif not SEMVER_RE.match(version):
        errors.append("Version must be valid semver (MAJOR.MINOR.PATCH)")

    if not description:
        errors.append("Missing required field: description")

    repo_root = find_repo_root(tool_path)
    if repo_root:
        categories = load_categories(repo_root)
        if category and category not in categories:
            errors.append(f"Unknown category '{category}' (not in categories.yaml)")
    else:
        if category:
            errors.append("Cannot validate category (categories.yaml not found)")

    if not readme_path.exists():
        errors.append(f"Missing README.md at {readme_path}")
    else:
        readme_text = readme_path.read_text(encoding="utf-8")
        for section in REQUIRED_README_SECTIONS:
            if section not in readme_text:
                errors.append(f"README.md missing section: {section}")

    return errors


def main() -> int:
    if len(sys.argv) < 2:
        print("Usage: python scripts/validate_tool.py path/to/tool")
        return 1

    tool_path = Path(sys.argv[1])
    errors = validate_tool(tool_path)
    if errors:
        print("Validation failed:")
        for err in errors:
            print(f"- {err}")
        return 1

    print("Validation passed")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())