"""
Pro 多路转播：每频道独立 URL 配置文件、跨频道抖音地址去重、同步到 legacy youtube.ini + URL_config.ini。
"""
from __future__ import annotations

import json
import re
import time
from pathlib import Path
from typing import Any, Callable, Awaitable

# 与 web2_client_overview 一致的去重键
def _norm_douyin_url(url: str) -> str:
    u = (url or "").strip()
    if not u:
        return ""
    u = re.sub(r"#.*$", "", u).strip()
    return u.rstrip("/").lower()


def _norm_stream_key(key: str) -> str:
    k = (key or "").strip()
    if not k:
        return ""
    if k.startswith("rtmp://") or k.startswith("rtmps://"):
        parts = k.rstrip("/").split("/")
        k = parts[-1] if parts else k
    return k.strip().lower()


def relay_pro_dir(config_dir: Path) -> Path:
    p = config_dir / "relay_pro"
    p.mkdir(parents=True, exist_ok=True)
    return p


def _safe_channel_file_id(channel_id: str) -> str:
    s = re.sub(r"[^a-zA-Z0-9_-]", "_", (channel_id or "").strip())
    return s or "default"


def url_config_path_for_channel(config_dir: Path, channel_id: str) -> Path:
    return relay_pro_dir(config_dir) / f"url_config.{_safe_channel_file_id(channel_id)}.ini"


def channels_json_path(config_dir: Path) -> Path:
    return config_dir / "youtube_channels.json"


def ensure_default_relay_config(config_dir: Path) -> None:
    """若缺少 youtube_channels.json 或 channels 为空，则写入默认 ch_default 与 url_config（便于独立运行 uvicorn）。"""
    config_dir = Path(config_dir)
    config_dir.mkdir(parents=True, exist_ok=True)
    relay_pro_dir(config_dir)
    p = channels_json_path(config_dir)
    need_write = False
    if not p.exists():
        need_write = True
    else:
        try:
            raw = json.loads(p.read_text(encoding="utf-8"))
        except Exception:
            need_write = True
            raw = None
        else:
            arr = raw.get("channels") if isinstance(raw, dict) else None
            if not isinstance(arr, list) or len(arr) == 0:
                need_write = True
    if not need_write:
        return
    default_doc: dict[str, Any] = {
        "version": 1,
        "autoManaged": True,
        "channels": [
            {
                "id": "ch_default",
                "name": "默认线路",
                "douyinUrl": "",
                "youtubeKey": "",
            }
        ],
    }
    p.write_text(json.dumps(default_doc, ensure_ascii=False, indent=2), encoding="utf-8")
    uc = url_config_path_for_channel(config_dir, "ch_default")
    if not uc.exists():
        uc.write_text(
            "# 软件已自动创建。每行一个抖音直播间地址，例如：\n# https://live.douyin.com/123456789\n\n",
            encoding="utf-8",
        )


def load_channels_document(config_dir: Path) -> tuple[dict[str, Any] | None, list[str]]:
    p = channels_json_path(config_dir)
    if not p.exists():
        return None, ["缺少 config/youtube_channels.json，请先添加（见 youtube_channels.example.json）"]
    try:
        raw = json.loads(p.read_text(encoding="utf-8"))
    except Exception as e:
        return None, [f"youtube_channels.json 解析失败: {e}"]
    if not isinstance(raw, dict):
        return None, ["youtube_channels.json 格式错误"]
    arr = raw.get("channels")
    if not isinstance(arr, list):
        return None, ["youtube_channels.json 缺少 channels 数组"]
    return raw, []


def ensure_channel_ids(config_dir: Path, raw: dict[str, Any]) -> bool:
    """为缺 id 的条目补 ch_0, ch_1 并写回文件。返回是否写回。"""
    arr = raw.get("channels")
    if not isinstance(arr, list):
        return False
    changed = False
    for i, item in enumerate(arr):
        if not isinstance(item, dict):
            continue
        cid = str(item.get("id") or "").strip()
        if not cid:
            item["id"] = f"ch_{i}"
            changed = True
    if changed:
        channels_json_path(config_dir).write_text(json.dumps(raw, ensure_ascii=False, indent=2), encoding="utf-8")
    return changed


def list_channels_for_pro(config_dir: Path) -> dict[str, Any]:
    doc, errs = load_channels_document(config_dir)
    if doc is None:
        return {"ok": False, "error": errs[0] if errs else "未知错误", "channels": []}
    ensure_channel_ids(config_dir, doc)
    doc, _ = load_channels_document(config_dir)
    assert doc is not None
    arr = doc.get("channels")
    out: list[dict[str, Any]] = []
    if isinstance(arr, list):
        for item in arr:
            if not isinstance(item, dict):
                continue
            cid = str(item.get("id") or "").strip()
            name = str(item.get("name") or "").strip() or "未命名"
            durl = str(item.get("douyinUrl") or item.get("douyin_url") or "").strip()
            key = str(item.get("youtubeKey") or item.get("key") or "").strip()
            if not cid:
                continue
            kp = _mask_key_preview(key)
            out.append(
                {
                    "id": cid,
                    "name": name,
                    "douyinUrl": durl,
                    "keyPreview": kp,
                }
            )
    return {"ok": True, "channels": out}


def _mask_key_preview(key: str) -> str:
    k = (key or "").strip()
    if not k:
        return ""
    if len(k) <= 8:
        return "****"
    return f"{k[:4]}…{k[-4:]}"


def get_channel_by_id(config_dir: Path, channel_id: str) -> dict[str, Any] | None:
    doc, _ = load_channels_document(config_dir)
    if doc is None:
        return None
    arr = doc.get("channels")
    if not isinstance(arr, list):
        return None
    for item in arr:
        if not isinstance(item, dict):
            continue
        if str(item.get("id") or "").strip() == channel_id:
            return item
    return None


def get_channel_detail(config_dir: Path, channel_id: str) -> dict[str, Any] | None:
    ch = get_channel_by_id(config_dir, channel_id)
    if not ch:
        return None
    return {
        "id": str(ch.get("id") or "").strip(),
        "name": str(ch.get("name") or "").strip() or "未命名",
        "douyinUrl": str(ch.get("douyinUrl") or ch.get("douyin_url") or "").strip(),
        "youtubeKey": str(ch.get("youtubeKey") or ch.get("key") or "").strip(),
    }


def update_channel_key(config_dir: Path, channel_id: str, new_key: str) -> tuple[bool, str]:
    doc, errs = load_channels_document(config_dir)
    if doc is None:
        return False, errs[0] if errs else "无法读取配置"
    arr = doc.get("channels")
    if not isinstance(arr, list):
        return False, "channels 无效"
    nk = _norm_stream_key(new_key)
    if not nk:
        return False, "密钥不能为空"
    for item in arr:
        if not isinstance(item, dict):
            continue
        oid = str(item.get("id") or "").strip()
        if oid == channel_id:
            continue
        ok = _norm_stream_key(str(item.get("youtubeKey") or item.get("key") or ""))
        if ok and ok == nk:
            return False, "禁止多条线路共用同一 YouTube 串流密钥"
    for item in arr:
        if not isinstance(item, dict):
            continue
        if str(item.get("id") or "").strip() != channel_id:
            continue
        item["youtubeKey"] = new_key.strip()
        channels_json_path(config_dir).write_text(json.dumps(doc, ensure_ascii=False, indent=2), encoding="utf-8")
        return True, "已保存"
    return False, "未找到该频道"


def extract_url_lines_from_ini(text: str) -> list[str]:
    lines: list[str] = []
    for raw in text.splitlines():
        t = raw.strip()
        if not t or t.startswith("#"):
            continue
        if "," in t:
            t = t.split(",")[-1].strip()
        if "douyin" in t.lower() or "v.douyin.com" in t.lower() or "live.douyin.com" in t.lower():
            lines.append(t)
    return lines


def collect_normalized_urls_from_all_other_channels(
    config_dir: Path, exclude_channel_id: str
) -> dict[str, set[str]]:
    """channel_id -> set of normalized douyin urls from their url_config file."""
    doc, _ = load_channels_document(config_dir)
    out: dict[str, set[str]] = {}
    if doc is None:
        return out
    arr = doc.get("channels")
    if not isinstance(arr, list):
        return out
    for item in arr:
        if not isinstance(item, dict):
            continue
        cid = str(item.get("id") or "").strip()
        if not cid or cid == exclude_channel_id:
            continue
        p = url_config_path_for_channel(config_dir, cid)
        if not p.exists():
            out[cid] = set()
            continue
        try:
            text = p.read_text(encoding="utf-8", errors="ignore")
        except Exception:
            out[cid] = set()
            continue
        s: set[str] = set()
        for line in extract_url_lines_from_ini(text):
            nd = _norm_douyin_url(line)
            if nd:
                s.add(nd)
        out[cid] = s
    return out


def validate_url_config_no_cross_duplicate(
    config_dir: Path, channel_id: str, new_content: str
) -> list[str]:
    """保存本频道 URL 列表时，与其它频道的 URL 去重（禁止同一抖音直播间出现在多条线路）。"""
    errors: list[str] = []
    mine: set[str] = set()
    for line in extract_url_lines_from_ini(new_content):
        nd = _norm_douyin_url(line)
        if nd:
            mine.add(nd)
    others = collect_normalized_urls_from_all_other_channels(config_dir, channel_id)
    for ocid, oset in others.items():
        inter = mine & oset
        if inter:
            errors.append(
                f"与频道「{ocid}」的地址列表冲突：以下抖音链接已出现在其它线路（禁止重复）："
                + "；".join(list(inter)[:5])
            )
    return errors


def read_url_config_for_channel(config_dir: Path, channel_id: str) -> str:
    p = url_config_path_for_channel(config_dir, channel_id)
    if not p.exists():
        return "# 每行一个抖音直播间地址\n"
    try:
        return p.read_text(encoding="utf-8")
    except Exception:
        return "# 读取失败\n"


def write_url_config_for_channel(config_dir: Path, channel_id: str, content: str) -> tuple[bool, str]:
    errs = validate_url_config_no_cross_duplicate(config_dir, channel_id, content)
    if errs:
        return False, errs[0]
    p = url_config_path_for_channel(config_dir, channel_id)
    p.parent.mkdir(parents=True, exist_ok=True)
    p.write_text(content, encoding="utf-8")
    return True, "保存成功"


def write_youtube_ini_single_key(config_dir: Path, key: str) -> None:
    """写入单路 youtube.ini（[youtube] key=）。"""
    lines = ["[youtube]", f"key = {key.strip()}", ""]
    (config_dir / "youtube.ini").write_text("\n".join(lines), encoding="utf-8")


def sync_channel_to_legacy_files(config_dir: Path, channel_id: str) -> tuple[bool, str]:
    """将选中频道的密钥与 URL 列表同步到 youtube.ini + URL_config.ini，供当前单进程 youtube 脚本使用。"""
    d = get_channel_detail(config_dir, channel_id)
    if not d:
        return False, "频道不存在"
    key = d.get("youtubeKey") or ""
    if not str(key).strip():
        return False, "该频道未配置 youtubeKey"
    url_path = url_config_path_for_channel(config_dir, channel_id)
    if not url_path.exists():
        return False, f"缺少该频道的地址文件：{url_path.name}"
    try:
        url_body = url_path.read_text(encoding="utf-8")
    except Exception as e:
        return False, f"读取地址文件失败: {e}"
    write_youtube_ini_single_key(config_dir, str(key))
    (config_dir / "URL_config.ini").write_text(url_body, encoding="utf-8")
    return True, "已同步到 youtube.ini 与 URL_config.ini"


def parse_relay_meta_lines(log_text: str) -> list[dict[str, Any]]:
    out: list[dict[str, Any]] = []
    for line in log_text.splitlines():
        if "[RELAY_META]" not in line:
            continue
        idx = line.find("{")
        if idx < 0:
            continue
        try:
            j = json.loads(line[idx:])
            if isinstance(j, dict):
                out.append(j)
        except Exception:
            continue
    return out


async def build_relay_live_status(
    config_dir: Path,
    base_dir: Path,
    get_process_info: Callable[[str], Awaitable[dict[str, Any]]],
    read_log_tail: Callable[[str, int], Awaitable[str]],
    youtube_pm2_name: str,
) -> dict[str, Any]:
    """工作台 Pro：解析日志 RELAY_META + 进程状态，匹配 youtube_channels.json 频道名。"""
    ch_doc = list_channels_for_pro(config_dir)
    id_to_name = {c["id"]: c["name"] for c in ch_doc.get("channels") or []}
    try:
        info = await get_process_info(youtube_pm2_name)
    except Exception:
        info = {"process_status": "unknown", "out_path": "", "err_path": ""}
    st = str(info.get("process_status") or "unknown")
    online = st == "online"
    out_path = str(info.get("out_path") or "")
    err_path = str(info.get("err_path") or "")
    recent = ""
    try:
        if out_path:
            recent += await read_log_tail(out_path, 400)
        if err_path:
            recent += "\n" + await read_log_tail(err_path, 400)
    except Exception:
        recent = recent or ""
    metas = parse_relay_meta_lines(recent)
    last = metas[-1] if metas else None
    rows: list[dict[str, Any]] = []
    suffix = str(last.get("youtubeKeySuffix") or "").strip().lower() if last else ""
    matched_id, matched_name = _match_channel_by_key_suffix(config_dir, suffix)
    if last:
        ts = last.get("ts")
        duration_sec: float | None = None
        if isinstance(ts, (int, float)):
            duration_sec = max(0.0, time.time() - float(ts))
        rows.append(
            {
                "channelId": matched_id or None,
                "channelName": matched_name or id_to_name.get(matched_id, "") or "当前推流",
                "anchor": last.get("anchor"),
                "douyinHint": last.get("douyinHint"),
                "streamTitle": last.get("streamTitle"),
                "youtubeKeySuffix": last.get("youtubeKeySuffix"),
                "durationSec": duration_sec,
                "processOnline": online,
            }
        )
    return {
        "youtubeProcess": youtube_pm2_name,
        "processStatus": st,
        "processOnline": online,
        "relayRows": rows,
        "lastRelayMeta": last,
    }


def _match_channel_by_key_suffix(config_dir: Path, suffix: str) -> tuple[str, str]:
    """用 RELAY_META 的 youtubeKeySuffix 与 youtube_channels.json 中密钥比对。"""
    if not suffix:
        return "", ""
    doc, _ = load_channels_document(config_dir)
    if not doc or not isinstance(doc.get("channels"), list):
        return "", ""
    for item in doc["channels"]:
        if not isinstance(item, dict):
            continue
        k = str(item.get("youtubeKey") or item.get("key") or "").strip()
        if not k:
            continue
        if k.startswith("rtmp://") or k.startswith("rtmps://"):
            parts = k.rstrip("/").split("/")
            k = parts[-1] if parts else k
        tail = k[-8:].lower() if len(k) >= 8 else k.lower()
        if suffix == tail or (len(suffix) >= 4 and tail.endswith(suffix)):
            return str(item.get("id") or ""), str(item.get("name") or "")
    return "", ""


def first_youtube_pm2_name(script_entries: list[dict[str, Any]]) -> str:
    for e in script_entries:
        script = str(e.get("script") or "")
        if script.endswith(".py") and Path(script).stem.startswith("youtube"):
            return Path(script).stem
    return "youtube2"