from __future__ import annotations

import json
import os
from pathlib import Path


MEDIA_ROOT = Path(os.environ.get("MEDIA_ROOT", "data/media")).resolve()


def published_assets(entity_type: str | None = None) -> list[dict]:
    manifest = json.loads((MEDIA_ROOT / "manifest.json").read_text(encoding="utf-8"))
    result = []
    for item in manifest.get("assets", []):
        if item.get("status") != "approved" or not item.get("sha256") or not item.get("local_path"):
            continue
        if entity_type and item.get("entity_type") != entity_type:
            continue
        source_page = str(item.get("source_page") or "")
        source = "rf4db" if "rf4db.com" in source_page else "rf4map" if "rf4map.ru" in source_page else "rf4-official"
        result.append({
            "id": item["sha256"],
            "entity_type": item.get("entity_type"),
            "entity_key": item.get("entity_key"),
            "label": item.get("label"),
            "width": item.get("width"),
            "height": item.get("height"),
            "content_type": item.get("content_type"),
            "image_url": f"/api/v1/media/assets/{item['sha256']}",
            "source_system": source,
            "source_url": source_page,
        })
    return sorted(result, key=lambda item: (str(item["entity_type"]), str(item["label"] or "").casefold(), item["id"]))


def published_file(digest: str) -> tuple[Path, str] | None:
    if len(digest) != 64 or any(char not in "0123456789abcdef" for char in digest):
        return None
    manifest = json.loads((MEDIA_ROOT / "manifest.json").read_text(encoding="utf-8"))
    item = next((row for row in manifest.get("assets", []) if row.get("status") == "approved" and row.get("sha256") == digest), None)
    if not item:
        return None
    target = (MEDIA_ROOT / item["local_path"]).resolve()
    if not target.is_relative_to(MEDIA_ROOT.resolve()) or not target.is_file():
        return None
    return target, str(item["content_type"])