from __future__ import annotations

import argparse
import hashlib
import json
from pathlib import Path
from typing import Any

from fetch_1c_its_docs import LinkParser, charset_from_content_type, is_content_src_url, normalize_url, safe_slug


ROOT = Path(__file__).resolve().parents[1]
DEFAULT_RAW_DIR = ROOT / "plugins" / "1c" / "rag" / "official-docs" / "raw"
DEFAULT_MANIFEST = DEFAULT_RAW_DIR / "manifest.json"


def load_json(path: Path) -> dict[str, Any]:
    if not path.exists():
        return {}
    try:
        data = json.loads(path.read_text(encoding="utf-8-sig"))
    except json.JSONDecodeError:
        return {}
    return data if isinstance(data, dict) else {}


def inspect_plan(manifest_path: Path, raw_dir: Path) -> dict[str, Any]:
    manifest = load_json(manifest_path)
    records = manifest.get("pages") or []
    existing_urls = {str(record.get("url") or "") for record in records}
    candidates_by_url: dict[str, dict[str, Any]] = {}
    shell_pages = 0

    for record in records:
        filename = str(record.get("file") or "")
        url = str(record.get("url") or "")
        if is_content_src_url(url):
            continue
        path = raw_dir / filename
        if not path.exists():
            continue
        try:
            body = path.read_bytes()
            text = body.decode(charset_from_content_type(str(record.get("content_type") or "")), errors="replace")
        except OSError:
            continue
        parser = LinkParser()
        parser.feed(text)
        src_links = []
        for href in parser.links:
            next_url = normalize_url(url, href)
            if next_url and is_content_src_url(next_url):
                src_links.append(next_url)
        if not src_links:
            continue
        shell_pages += 1
        for src_url in src_links:
            if src_url.endswith("#_print"):
                continue
            candidates_by_url[src_url] = {
                "url": src_url,
                "expected_file": safe_slug(src_url),
                "already_in_manifest": src_url in existing_urls,
                "already_on_disk": (raw_dir / safe_slug(src_url)).exists(),
                "parent_url": url,
                "parent_title": record.get("title"),
                "source_id": record.get("source_id"),
                "source_type": record.get("source_type"),
            }

    candidates = sorted(candidates_by_url.values(), key=lambda item: item["url"])
    missing = [item for item in candidates if not item["already_in_manifest"] and not item["already_on_disk"]]
    return {
        "schema": "onec_its_fetch_plan_inspection.v1",
        "manifest": str(manifest_path),
        "raw_dir": str(raw_dir),
        "manifest_sha256": hashlib.sha256(manifest_path.read_bytes()).hexdigest() if manifest_path.exists() else None,
        "counts": {
            "raw_pages": len(records),
            "shell_pages_with_src": shell_pages,
            "src_candidates": len(candidates),
            "missing_src_candidates": len(missing),
        },
        "missing_src_candidates": missing,
        "src_candidates": candidates,
    }


def main() -> int:
    parser = argparse.ArgumentParser(description="Inspect already fetched 1C:ITS hdoc shells for missing /src/ body pages.")
    parser.add_argument("--manifest", type=Path, default=DEFAULT_MANIFEST)
    parser.add_argument("--raw-dir", type=Path, default=DEFAULT_RAW_DIR)
    parser.add_argument("--output", type=Path)
    parser.add_argument("--print", action="store_true", dest="print_full")
    args = parser.parse_args()

    result = inspect_plan(args.manifest, args.raw_dir)
    if args.output:
        args.output.parent.mkdir(parents=True, exist_ok=True)
        args.output.write_text(json.dumps(result, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")
    payload = result if args.print_full else {"counts": result["counts"], "output": str(args.output) if args.output else None}
    print(json.dumps(payload, ensure_ascii=False, indent=2))
    return 0


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