import base64
import logging
import os
import time

from flask import Blueprint, jsonify, request, send_file

from backend.config import LOGIN_TIMEOUT, STATIC_DIR
from backend.proxy import test_proxy_api
from backend.session import login_session
from backend.sso.qr_login import check_login_state, cleanup_session, debug_snapshot, start_qr_login

api_bp = Blueprint("api", __name__)
logger = logging.getLogger(__name__)

login_session.login_timeout = LOGIN_TIMEOUT


def _save_qr_png(qrcode_b64: str):
    if not qrcode_b64:
        return
    raw = qrcode_b64.split(",", 1)[-1]
    img_bytes = base64.b64decode(raw)
    path = os.path.join(STATIC_DIR, "qrcode.png")
    with open(path, "wb") as f:
        f.write(img_bytes)


@api_bp.route("/api/start_qr", methods=["POST"])
def start_qr():
    if not login_session.lock.acquire(blocking=False):
        return jsonify({"status": "error", "message": "已有正在进行的扫码任务，请稍后重试"})
    try:
        data = request.get_json() or {}
        proxy_api = data.get("proxy_api", "").strip()
        result, qr_b64 = start_qr_login(proxy_api)
        if qr_b64:
            try:
                _save_qr_png(qr_b64)
            except Exception as e:
                logger.warning("保存二维码图片失败: %s", e)
        return jsonify(result)
    finally:
        login_session.lock.release()


@api_bp.route("/api/check_login", methods=["GET"])
def check_login():
    req_sid = request.args.get("session_id", "")
    if req_sid and login_session.session_id and req_sid != login_session.session_id:
        return jsonify({"status": "idle", "message": "会话已过期，请重新获取二维码"})

    if login_session.status in ("idle", "loading"):
        return jsonify({"status": login_session.status, "message": login_session.message})

    if login_session.status == "error":
        return jsonify({"status": "error", "message": login_session.message})

    if login_session.status == "success" and login_session.cookies:
        return jsonify({
            "status": "success",
            "session_id": login_session.session_id,
            "nickname": login_session.nickname,
            "cookies": login_session.cookies,
            "message": login_session.message,
        })

    try:
        return jsonify(check_login_state())
    except Exception as e:
        logger.error("检查登录异常: %s", e, exc_info=True)
        return jsonify({"status": "error", "message": str(e)})


@api_bp.route("/api/test_proxy", methods=["POST"])
def test_proxy():
    data = request.get_json() or {}
    proxy_api = data.get("proxy_api", "").strip()
    if not proxy_api:
        return jsonify({"status": "error", "message": "请提供代理 API"})
    try:
        return jsonify(test_proxy_api(proxy_api))
    except Exception as e:
        return jsonify({"status": "error", "message": str(e)})


@api_bp.route("/api/status", methods=["GET"])
def api_status():
    elapsed = ""
    if login_session.status in ("qr_ready", "scanning", "success") and login_session.start_time:
        elapsed_sec = int(time.time() - login_session.start_time)
        elapsed = f" (已等待 {elapsed_sec}s)"
    client = login_session.sso_client
    return jsonify({
        "status": login_session.status,
        "message": login_session.message + elapsed,
        "session_id": login_session.session_id or "",
        "nickname": login_session.nickname or "",
        "proxy_used": login_session.proxy_used,
        "api_mode": getattr(client, "api_mode", None) if client else None,
        "login_timeout": LOGIN_TIMEOUT,
    })


@api_bp.route("/api/reset", methods=["POST"])
def api_reset():
    cleanup_session()
    login_session.reset()
    login_session.message = "会话已重置"
    return jsonify({"status": "success", "message": "会话已重置"})


@api_bp.route("/api/health", methods=["GET"])
def api_health():
    client = login_session.sso_client
    return jsonify({
        "status": "ok",
        "session_status": login_session.status,
        "session_id": login_session.session_id or "",
        "api_mode": getattr(client, "api_mode", None) if client else None,
        "engine": "http_sso",
        "timestamp": time.time(),
    })


@api_bp.route("/api/debug", methods=["GET"])
def api_debug():
    try:
        return jsonify(debug_snapshot())
    except Exception as e:
        return jsonify({"status": "error", "message": str(e)})


@api_bp.route("/qrcode.png")
def get_qrcode():
    qr_path = os.path.join(STATIC_DIR, "qrcode.png")
    if os.path.exists(qr_path):
        return send_file(qr_path, mimetype="image/png")
    return "二维码未生成，请先点击获取二维码", 404