"use client";

import { useEffect, useState, useRef } from "react";

import { Button } from "@/components/ui/button";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Checkbox } from "@/components/ui/checkbox";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import Avatar from "@/components/ui/avatar";
import { api } from "@/lib/api";
import { useTranslation } from "@/lib/i18n";
import { useUser } from "@/lib/user-context";

type Me = {
  username?: string;
  avatar?: string | null;
  timezone: string;
  barkUrl?: string | null;
  inappEnabled: boolean;
  barkEnabled: boolean;
};

const SettingsPanel = () => {
  const t = useTranslation();
  const { refreshUser } = useUser();
  const fileInputRef = useRef<HTMLInputElement>(null);
  const [form, setForm] = useState<Me>({
    timezone: "Asia/Shanghai",
    barkUrl: "",
    avatar: null,
    inappEnabled: true,
    barkEnabled: false,
  });
  const [saved, setSaved] = useState(false);
  const [uploading, setUploading] = useState(false);
  const [passwordForm, setPasswordForm] = useState({
    currentPassword: "",
    newPassword: "",
    confirmPassword: "",
  });
  const [passwordError, setPasswordError] = useState("");
  const [passwordSuccess, setPasswordSuccess] = useState(false);
  const [changingPassword, setChangingPassword] = useState(false);

  useEffect(() => {
    api
      .getMe()
      .then((data) => setForm(data as Me))
      .catch(() => null);
  }, []);

  const save = async () => {
    await api.updateSettings({
      avatar: form.avatar || null,
      timezone: form.timezone,
      barkUrl: form.barkUrl || null,
      inappEnabled: form.inappEnabled,
      barkEnabled: form.barkEnabled,
    });
    await refreshUser();
    setSaved(true);
    setTimeout(() => setSaved(false), 1500);
  };

  const handleFileChange = async (event: React.ChangeEvent<HTMLInputElement>) => {
    const file = event.target.files?.[0];
    if (!file) return;

    // 验证文件类型
    const allowedTypes = ["image/jpeg", "image/png", "image/gif", "image/webp"];
    if (!allowedTypes.includes(file.type)) {
      alert("不支持的文件格式，请上传 jpg、png、gif 或 webp 格式的图片");
      return;
    }

    // 验证文件大小 (5MB)
    if (file.size > 5 * 1024 * 1024) {
      alert("文件大小不能超过 5MB");
      return;
    }

    try {
      setUploading(true);
      const result = await api.uploadAvatar(file);
      setForm({ ...form, avatar: result.avatarUrl });
      await refreshUser();
    } catch (error) {
      console.error("上传头像失败:", error);
      alert("上传头像失败，请重试");
    } finally {
      setUploading(false);
    }
  };

  const handleRemoveAvatar = () => {
    setForm({ ...form, avatar: null });
    if (fileInputRef.current) {
      fileInputRef.current.value = "";
    }
  };

  const handleChangePassword = async () => {
    setPasswordError("");
    setPasswordSuccess(false);

    if (!passwordForm.currentPassword) {
      setPasswordError(t("currentPasswordRequired"));
      return;
    }
    if (!passwordForm.newPassword) {
      setPasswordError(t("newPasswordRequired"));
      return;
    }
    if (passwordForm.newPassword.length < 6) {
      setPasswordError(t("passwordTooShort"));
      return;
    }
    if (passwordForm.newPassword !== passwordForm.confirmPassword) {
      setPasswordError(t("passwordMismatch"));
      return;
    }

    try {
      setChangingPassword(true);
      await api.changePassword({
        currentPassword: passwordForm.currentPassword,
        newPassword: passwordForm.newPassword,
      });
      setPasswordSuccess(true);
      setPasswordForm({ currentPassword: "", newPassword: "", confirmPassword: "" });
      setTimeout(() => setPasswordSuccess(false), 3000);
    } catch (error) {
      setPasswordError(error instanceof Error ? error.message : "Failed to change password");
    } finally {
      setChangingPassword(false);
    }
  };

  return (
    <Card>
      <CardHeader>
        <CardTitle className="text-xl">{t("settings")}</CardTitle>
        <CardDescription>{t("settingsDesc")}</CardDescription>
      </CardHeader>
      <CardContent>
        <div className="space-y-4">
          {/* Avatar Section */}
          <div className="space-y-2">
            <Label>{t("avatar")}</Label>
            <div className="flex items-center gap-4">
              <Avatar username={form.username} src={form.avatar} size="lg" />
              <div className="flex flex-col gap-2">
                <input
                  ref={fileInputRef}
                  type="file"
                  accept="image/*"
                  onChange={handleFileChange}
                  className="hidden"
                  id="avatar-upload"
                />
                <Button
                  variant="outline"
                  size="sm"
                  onClick={() => fileInputRef.current?.click()}
                  disabled={uploading}
                >
                  {uploading ? t("uploading") : t("uploadAvatar")}
                </Button>
                {form.avatar && (
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={handleRemoveAvatar}
                  >
                    {t("removeAvatar")}
                  </Button>
                )}
                <p className="text-xs text-muted-foreground">{t("avatarHint")}</p>
              </div>
            </div>
          </div>

          <div className="space-y-2">
            <Label htmlFor="barkUrl">{t("barkPushUrl")}</Label>
            <Input
              id="barkUrl"
              value={form.barkUrl ?? ""}
              onChange={(event) => setForm({ ...form, barkUrl: event.target.value })}
              placeholder="https://your.bark.server"
            />
          </div>
          <div className="space-y-2">
            <Label htmlFor="timezone">{t("timezone")}</Label>
            <Input
              id="timezone"
              value={form.timezone}
              onChange={(event) => setForm({ ...form, timezone: event.target.value })}
              placeholder="Asia/Shanghai"
            />
          </div>
          <div className="space-y-2">
            <Label>{t("notificationChannels")}</Label>
            <div className="rounded-xl bg-muted/50 border border-border/60">
              <div className="flex items-center justify-between px-4 py-3">
                <div>
                  <div className="text-sm font-medium text-foreground">{t("webNotifications")}</div>
                  <div className="text-xs leading-relaxed text-muted-foreground">{t("webNotificationsDesc")}</div>
                </div>
                <Checkbox
                  id="inapp"
                  checked={form.inappEnabled}
                  onCheckedChange={(checked) =>
                    setForm({ ...form, inappEnabled: checked === true })
                  }
                />
              </div>
              <div className="mx-4 h-px bg-border/60" />
              <div className="flex items-center justify-between px-4 py-3">
                <div>
                  <div className="text-sm font-medium text-foreground">{t("barkAlerts")}</div>
                  <div className="text-xs leading-relaxed text-muted-foreground">{t("barkAlertsDesc")}</div>
                </div>
                <Checkbox
                  id="bark"
                  checked={form.barkEnabled}
                  onCheckedChange={(checked) =>
                    setForm({ ...form, barkEnabled: checked === true })
                  }
                />
              </div>
            </div>
          </div>
          <div className="flex items-center gap-3">
            <Button variant="outline" onClick={save}>
              {t("save")}
            </Button>
            <Button variant="outline" type="button">
              {t("cancel")}
            </Button>
            {saved && <div className="text-sm text-primary">{t("saved")}</div>}
          </div>

          {/* Change Password Section */}
          <div className="mt-8 pt-6 border-t border-border">
            <h3 className="text-lg font-semibold tracking-tight mb-4">{t("changePassword")}</h3>
            <div className="space-y-4">
              <div className="space-y-2">
                <Label htmlFor="currentPassword">{t("currentPassword")}</Label>
                <Input
                  id="currentPassword"
                  type="password"
                  value={passwordForm.currentPassword}
                  onChange={(e) => setPasswordForm({ ...passwordForm, currentPassword: e.target.value })}
                />
              </div>
              <div className="space-y-2">
                <Label htmlFor="newPassword">{t("newPassword")}</Label>
                <Input
                  id="newPassword"
                  type="password"
                  value={passwordForm.newPassword}
                  onChange={(e) => setPasswordForm({ ...passwordForm, newPassword: e.target.value })}
                />
              </div>
              <div className="space-y-2">
                <Label htmlFor="confirmPassword">{t("confirmNewPassword")}</Label>
                <Input
                  id="confirmPassword"
                  type="password"
                  value={passwordForm.confirmPassword}
                  onChange={(e) => setPasswordForm({ ...passwordForm, confirmPassword: e.target.value })}
                />
              </div>
              {passwordError && (
                <div className="text-sm text-red-500">{passwordError}</div>
              )}
              {passwordSuccess && (
                <div className="text-sm text-green-600">{t("passwordChanged")}</div>
              )}
              <Button
                variant="outline"
                onClick={handleChangePassword}
                disabled={changingPassword}
              >
                {changingPassword ? t("loading") : t("changePassword")}
              </Button>
            </div>
          </div>
        </div>
      </CardContent>
    </Card>
  );
};

export default SettingsPanel;
