"use client";

import { useState, useEffect, useCallback } from "react";
import Link from "next/link";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  cloudDocConfigApi,
  type CloudDocConfigRead,
  type CloudDocConfigUpdate,
} from "@/lib/api/client";
import { Loader2, Save, FileStack } from "lucide-react";
import { toast } from "sonner";

export default function SettingsCloudDocConfigPage() {
  const [config, setConfig] = useState<CloudDocConfigRead | null>(null);
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [form, setForm] = useState<CloudDocConfigUpdate>({
    feishu: { app_id: "", app_secret: "" },
    yuque: { token: "", default_repo: "" },
    tencent: { client_id: "", client_secret: "" },
  });

  const load = useCallback(async () => {
    setLoading(true);
    try {
      const data = await cloudDocConfigApi.get();
      setConfig(data);
      setForm({
        feishu: { app_id: data.feishu.app_id, app_secret: "" },
        yuque: { token: "", default_repo: data.yuque.default_repo },
        tencent: { client_id: data.tencent.client_id, client_secret: "" },
      });
    } catch {
      toast.error("加载云文档配置失败");
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    load();
  }, [load]);

  const handleSave = async () => {
    setSaving(true);
    try {
      const payload: CloudDocConfigUpdate = {};
      if (form.feishu?.app_id !== undefined) payload.feishu = { app_id: form.feishu.app_id };
      if (form.feishu?.app_secret !== undefined && form.feishu.app_secret !== "")
        payload.feishu = { ...payload.feishu, app_secret: form.feishu.app_secret };
      if (form.yuque?.token !== undefined && form.yuque.token !== "")
        payload.yuque = { token: form.yuque.token };
      if (form.yuque?.default_repo !== undefined)
        payload.yuque = { ...payload.yuque, default_repo: form.yuque.default_repo };
      if (form.tencent?.client_id !== undefined) payload.tencent = { client_id: form.tencent.client_id };
      if (form.tencent?.client_secret !== undefined && form.tencent.client_secret !== "")
        payload.tencent = { ...payload.tencent, client_secret: form.tencent.client_secret };
      await cloudDocConfigApi.update(payload);
      toast.success("已保存");
      await load();
    } catch (e) {
      toast.error(e instanceof Error ? e.message : "保存失败");
    } finally {
      setSaving(false);
    }
  };

  if (loading) {
    return (
      <div className="p-6 max-w-2xl flex items-center gap-2">
        <Loader2 className="h-5 w-5 animate-spin" />
        <span className="text-sm text-muted-foreground">加载中…</span>
      </div>
    );
  }

  return (
    <div className="p-6 max-w-2xl">
      <div className="mb-4">
        <Link
          href="/settings"
          className="text-sm text-muted-foreground hover:text-foreground"
        >
          ← 设置
        </Link>
      </div>
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <FileStack className="h-5 w-5" />
            云文档配置
          </CardTitle>
          <p className="text-sm text-muted-foreground mt-1">
            配置飞书、语雀、腾讯文档的 API 凭证，用于在工作台「推送到云文档」时创建/更新在线文档。
          </p>
        </CardHeader>
        <CardContent className="space-y-6">
          {/* 飞书 */}
          <div className="space-y-3">
            <h3 className="text-sm font-medium">飞书 (Feishu)</h3>
            <div className="grid gap-2">
              <Label>App ID</Label>
              <Input
                value={form.feishu?.app_id ?? config?.feishu?.app_id ?? ""}
                onChange={(e) =>
                  setForm((f) => ({
                    ...f,
                    feishu: { ...f.feishu, app_id: e.target.value },
                  }))
                }
                placeholder="在飞书开放平台创建应用后获取"
              />
            </div>
            <div className="grid gap-2">
              <Label>App Secret</Label>
              <Input
                type="password"
                value={form.feishu?.app_secret ?? ""}
                onChange={(e) =>
                  setForm((f) => ({
                    ...f,
                    feishu: { ...f.feishu, app_secret: e.target.value },
                  }))
                }
                placeholder={config?.feishu?.app_secret_configured ? "已配置，留空不修改" : "必填"}
              />
            </div>
          </div>

          {/* 语雀 */}
          <div className="space-y-3">
            <h3 className="text-sm font-medium">语雀 (Yuque)</h3>
            <div className="grid gap-2">
              <Label>Personal Access Token</Label>
              <Input
                type="password"
                value={form.yuque?.token ?? ""}
                onChange={(e) =>
                  setForm((f) => ({
                    ...f,
                    yuque: { ...f.yuque, token: e.target.value },
                  }))
                }
                placeholder={config?.yuque?.token_configured ? "已配置，留空不修改" : "在语雀 设置 → Token 中创建"}
              />
            </div>
            <div className="grid gap-2">
              <Label>默认知识库 (namespace)</Label>
              <Input
                value={form.yuque?.default_repo ?? config?.yuque?.default_repo ?? ""}
                onChange={(e) =>
                  setForm((f) => ({
                    ...f,
                    yuque: { ...f.yuque, default_repo: e.target.value },
                  }))
                }
                placeholder="如：your_username/repo"
              />
            </div>
          </div>

          {/* 腾讯文档 */}
          <div className="space-y-3">
            <h3 className="text-sm font-medium">腾讯文档 (Tencent)</h3>
            <p className="text-xs text-muted-foreground">
              腾讯文档需 OAuth 用户授权，当前版本仅保留配置项，推送功能请先用飞书或语雀。
            </p>
            <div className="grid gap-2">
              <Label>Client ID</Label>
              <Input
                value={form.tencent?.client_id ?? config?.tencent?.client_id ?? ""}
                onChange={(e) =>
                  setForm((f) => ({
                    ...f,
                    tencent: { ...f.tencent, client_id: e.target.value },
                  }))
                }
                placeholder="开放平台应用 Client ID"
              />
            </div>
            <div className="grid gap-2">
              <Label>Client Secret</Label>
              <Input
                type="password"
                value={form.tencent?.client_secret ?? ""}
                onChange={(e) =>
                  setForm((f) => ({
                    ...f,
                    tencent: { ...f.tencent, client_secret: e.target.value },
                  }))
                }
                placeholder={config?.tencent?.client_secret_configured ? "已配置，留空不修改" : "选填"}
              />
            </div>
          </div>

          <Button onClick={handleSave} disabled={saving}>
            {saving ? <Loader2 className="h-4 w-4 animate-spin mr-2" /> : <Save className="h-4 w-4 mr-2" />}
            保存配置
          </Button>
        </CardContent>
      </Card>
    </div>
  );
}