#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from __future__ import annotations

import os
import time
import uuid

from flask import jsonify, request, session

from routes.admin_api import admin_api_bp
from routes.decorators import admin_required
from services.time_utils import get_beijing_now
from services.update_files import (
    ensure_update_dirs,
    get_update_job_log_path,
    get_update_request_path,
    get_update_result_path,
    get_update_status_path,
    load_json_file,
    sanitize_job_id,
    tail_text_file,
    write_json_atomic,
)


def _request_ip() -> str:
    try:
        return request.headers.get("X-Forwarded-For", "").split(",")[0].strip() or request.remote_addr or ""
    except Exception:
        return ""


def _make_job_id(prefix: str = "upd") -> str:
    now_str = get_beijing_now().strftime("%Y%m%d_%H%M%S")
    rand = uuid.uuid4().hex[:8]
    return f"{prefix}_{now_str}_{rand}"


def _has_pending_request() -> bool:
    try:
        return os.path.exists(get_update_request_path())
    except Exception:
        return False


def _parse_bool_field(data: dict, key: str) -> bool | None:
    if not isinstance(data, dict) or key not in data:
        return None
    value = data.get(key)
    if isinstance(value, bool):
        return value
    if isinstance(value, int):
        if value in (0, 1):
            return bool(value)
        raise ValueError(f"{key} 必须是 0/1 或 true/false")
    if isinstance(value, str):
        text = value.strip().lower()
        if text in ("1", "true", "yes", "y", "on"):
            return True
        if text in ("0", "false", "no", "n", "off", ""):
            return False
        raise ValueError(f"{key} 必须是 0/1 或 true/false")
    if value is None:
        return None
    raise ValueError(f"{key} 必须是 0/1 或 true/false")


def _admin_reauth_required() -> bool:
    try:
        return time.time() > float(session.get("admin_reauth_until", 0) or 0)
    except Exception:
        return True


@admin_api_bp.route("/update/status", methods=["GET"])
@admin_required
def get_update_status_api():
    """读取宿主机 Update-Agent 写入的 update/status.json。"""
    ensure_update_dirs()
    status_path = get_update_status_path()
    data, err = load_json_file(status_path)
    if err:
        return jsonify({"ok": False, "error": f"读取 status 失败: {err}", "data": data}), 200
    if not data:
        return jsonify({"ok": False, "error": "未发现更新状态（Update-Agent 可能未运行）"}), 200
    data.setdefault("update_available", False)
    return jsonify({"ok": True, "data": data}), 200


@admin_api_bp.route("/update/result", methods=["GET"])
@admin_required
def get_update_result_api():
    """读取 update/result.json（最近一次更新执行结果）。"""
    ensure_update_dirs()
    result_path = get_update_result_path()
    data, err = load_json_file(result_path)
    if err:
        return jsonify({"ok": False, "error": f"读取 result 失败: {err}", "data": data}), 200
    if not data:
        return jsonify({"ok": True, "data": None}), 200
    return jsonify({"ok": True, "data": data}), 200


@admin_api_bp.route("/update/log", methods=["GET"])
@admin_required
def get_update_log_api():
    """读取 update/jobs/<job_id>.log 的末尾内容（用于后台展示进度）。"""
    ensure_update_dirs()

    job_id = sanitize_job_id(request.args.get("job_id"))
    if not job_id:
        # 若未指定，则尝试用 result.json 的 job_id
        result_data, _ = load_json_file(get_update_result_path())
        job_id = sanitize_job_id(result_data.get("job_id") if isinstance(result_data, dict) else None)

    if not job_id:
        return jsonify({"ok": True, "job_id": None, "log": "", "truncated": False}), 200

    max_bytes = request.args.get("max_bytes", "200000")
    try:
        max_bytes_i = int(max_bytes)
    except Exception:
        max_bytes_i = 200_000
    max_bytes_i = max(10_000, min(2_000_000, max_bytes_i))

    log_path = get_update_job_log_path(job_id)
    text, truncated = tail_text_file(log_path, max_bytes=max_bytes_i)
    return jsonify({"ok": True, "job_id": job_id, "log": text, "truncated": truncated}), 200


@admin_api_bp.route("/update/check", methods=["POST"])
@admin_required
def request_update_check_api():
    """请求宿主机 Update-Agent 立刻执行一次检查更新。"""
    ensure_update_dirs()
    if _has_pending_request():
        return jsonify({"error": "已有更新请求正在处理中，请稍后再试"}), 409

    job_id = _make_job_id(prefix="chk")
    payload = {
        "job_id": job_id,
        "action": "check",
        "requested_at": get_beijing_now().strftime("%Y-%m-%d %H:%M:%S"),
        "requested_by": session.get("admin_username") or "",
        "requested_ip": _request_ip(),
    }
    write_json_atomic(get_update_request_path(), payload)
    return jsonify({"success": True, "job_id": job_id}), 200


@admin_api_bp.route("/update/run", methods=["POST"])
@admin_required
def request_update_run_api():
    """请求宿主机 Update-Agent 执行一键更新并重启服务。"""
    ensure_update_dirs()
    if _admin_reauth_required():
        return jsonify({"error": "需要二次确认", "code": "reauth_required"}), 401
    if _has_pending_request():
        return jsonify({"error": "已有更新请求正在处理中，请稍后再试"}), 409

    data = request.json or {}
    try:
        build_no_cache = _parse_bool_field(data, "build_no_cache")
        if build_no_cache is None:
            build_no_cache = _parse_bool_field(data, "no_cache")
        build_pull = _parse_bool_field(data, "build_pull")
        if build_pull is None:
            build_pull = _parse_bool_field(data, "pull")
    except ValueError as e:
        return jsonify({"error": str(e)}), 400

    job_id = _make_job_id(prefix="upd")
    payload = {
        "job_id": job_id,
        "action": "update",
        "requested_at": get_beijing_now().strftime("%Y-%m-%d %H:%M:%S"),
        "requested_by": session.get("admin_username") or "",
        "requested_ip": _request_ip(),
        "build_no_cache": bool(build_no_cache) if build_no_cache is not None else False,
        "build_pull": bool(build_pull) if build_pull is not None else False,
    }
    write_json_atomic(get_update_request_path(), payload)
    return jsonify(
        {
            "success": True,
            "job_id": job_id,
            "message": "已提交更新请求，服务将重启（页面可能短暂不可用），请等待1-2分钟后刷新",
        }
    ), 200