# -*- coding: utf-8 -*-
"""Клиент CurseForge API (https://api.curseforge.com/v1).

Официальный API требует заголовок x-api-key. Без ключа используется публичное
зеркало api.curse.tools — формат ответов там тот же (v1), так что код один.
Если ключ задан (set_api_key), запросы идут сначала на официальный API.
"""
import json
import urllib.parse

from . import http

OFFICIAL = "https://api.curseforge.com/v1"
MIRROR = "https://api.curse.tools/v1/cf"
HEADERS = {"Accept": "application/json",
           "User-Agent": "PixelLauncher/2.1.1 (lightweight Minecraft launcher)"}

# числовые id загрузчиков в CurseForge
LOADER_NAMES = {1: "forge", 2: "cauldron", 3: "liteloader", 4: "fabric",
                5: "quilt", 6: "neoforge"}

_api_key = ""


def set_api_key(key):
    """Ключ CurseForge API (необязателен — есть зеркало без ключа)."""
    global _api_key
    _api_key = (key or "").strip()


def get_api_key():
    return _api_key


def _bases():
    if _api_key:
        return [OFFICIAL, MIRROR]
    return [MIRROR]


def _get(path, params=None, timeout=30):
    """GET API. Бросает RuntimeError с текстом последней ошибки."""
    last = None
    for base in _bases():
        url = base + path
        if params:
            url += "?" + urllib.parse.urlencode(params)
        headers = dict(HEADERS)
        if base == OFFICIAL and _api_key:
            headers["x-api-key"] = _api_key
        try:
            raw = http.get_bytes(url, timeout=timeout, headers=headers)
            return json.loads(raw.decode("utf-8"))
        except Exception as e:  # noqa: BLE001
            last = e
    raise RuntimeError(str(last) if last else "CurseForge недоступен")


def search_modpacks(search_filter="", game_version="", modloader_type=None,
                    page_size=20, index=0):
    """Поиск сборок (classId 4471). Возвращает (список, всего_найдено)."""
    params = {
        "gameId": 432,
        "classId": 4471,
        "pageSize": page_size,
        "index": index,
        "sortField": 2,          # downloads
        "sortOrder": "desc",
    }
    if search_filter:
        params["searchFilter"] = search_filter
    if game_version:
        params["gameVersion"] = game_version
    if modloader_type:
        params["modLoaderType"] = modloader_type
    data = _get("/mods/search", params)
    out = []
    for m in (data.get("data") or []):
        logo = m.get("logo") or {}
        files = m.get("latestFiles") or []
        latest = next((f for f in files if f.get("downloadUrl")),
                      files[0] if files else None)
        latest = latest or {}
        loaders = []
        for idx in (m.get("latestFilesIndexes") or []):
            name = LOADER_NAMES.get(idx.get("modLoader"))
            if name and name not in loaders:
                loaders.append(name)
        out.append({
            "id": m.get("id"),
            "name": m.get("name") or "?",
            "slug": m.get("slug") or "",
            "summary": (m.get("summary") or "").strip(),
            "downloads": int(m.get("downloadCount") or 0),
            "icon": logo.get("thumbnailUrl") or logo.get("url") or "",
            "file_id": latest.get("id"),
            "file_name": latest.get("fileName") or "",
            "download_url": latest.get("downloadUrl") or "",
            "size": int(latest.get("fileLength") or 0),
            "game_versions": [x.get("gameVersion")
                              for x in (m.get("latestFilesIndexes") or [])],
            "loaders": loaders,
        })
    return out, int((data.get("pagination") or {}).get("totalCount") or 0)


def get_files(mod_id, game_version="", modloader_type=None, page_size=50):
    """Файлы сборки/мода. Возвращает список словарей."""
    params = {"pageSize": page_size}
    if game_version:
        params["gameVersion"] = game_version
    if modloader_type:
        params["modLoaderType"] = modloader_type
    data = _get("/mods/%s/files" % mod_id, params)
    out = []
    for f in (data.get("data") or []):
        out.append(_file(f))
    return out


def get_file(mod_id, file_id):
    """Один файл по id (нужен downloadUrl для скачивания)."""
    data = _get("/mods/%s/files/%s" % (mod_id, file_id))
    f = data.get("data") if isinstance(data, dict) else None
    return _file(f) if isinstance(f, dict) else {}


def _file(f):
    """Приводит ответ API к общему виду."""
    hashes = {}
    for h in (f.get("hashes") or []):
        algo = h.get("algo")
        if algo == 1:
            hashes["sha1"] = h.get("value") or ""
        elif algo == 2:
            hashes["md5"] = h.get("value") or ""
    return {
        "id": f.get("id"),
        "mod_id": f.get("modId"),
        "name": f.get("displayName") or f.get("fileName") or "",
        "file_name": f.get("fileName") or "",
        "download_url": f.get("downloadUrl") or "",
        "size": int(f.get("fileLength") or 0),
        "date": (f.get("fileDate") or "")[:10],
        "game_versions": f.get("gameVersions") or [],
        "sha1": hashes.get("sha1", ""),
        "md5": hashes.get("md5", ""),
    }


def get_download_url(mod_id, file_id):
    """Прямая ссылка на файл (downloadUrl из API)."""
    return get_file(mod_id, file_id).get("download_url") or ""


def download_pack(url, dest, size=0, progress=None, cancel=None):
    return http.download_file(url, dest, size=size, progress=progress,
                              cancel=cancel)