"use client";

import { useEffect, useMemo, useState } from "react";
import { CheckCircle2, Edit, KeyRound, List, Loader2, Plus, Trash2 } from "lucide-react";
import DashboardLayout from "@/components/layout/dashboard-layout";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Switch } from "@/components/ui/switch";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { useToast } from "@/components/ui/use-toast";
import { api } from "@/lib/api";

interface ModelConfig {
  id: number;
  user_id: number;
  name: string;
  provider: string;
  api_base: string | null;
  chat_model: string;
  embedding_model: string;
  is_active: boolean;
  has_api_key: boolean;
  api_key_masked: string;
  last_used_at: string | null;
  created_at: string;
  updated_at: string;
}

interface ProviderOption {
  provider: string;
  label: string;
  default_api_base: string;
  default_chat_model: string;
  default_embedding_model: string;
  chat_models: string[];
  embedding_models: string[];
  requires_api_key: boolean;
  supports_custom_api_base: boolean;
}

interface ProviderOptionsResponse {
  providers: ProviderOption[];
  defaults: {
    provider: string;
    api_base: string;
    chat_model: string;
    embedding_model: string;
  };
}

interface ModelConfigForm {
  name: string;
  provider: string;
  api_key: string;
  api_base: string;
  chat_model: string;
  embedding_model: string;
  is_active: boolean;
}

const DEFAULT_PROVIDER_OPTIONS: ProviderOptionsResponse = {
  providers: [
    {
      provider: "dashscope",
      label: "DashScope",
      default_api_base: "https://dashscope.aliyuncs.com/compatible-mode/v1",
      default_chat_model: "qwen3-max",
      default_embedding_model: "text-embedding-v4",
      chat_models: ["qwen3-max", "qwen-plus", "qwen-turbo", "qwen-max"],
      embedding_models: ["text-embedding-v4", "text-embedding-v3", "text-embedding-v2"],
      requires_api_key: true,
      supports_custom_api_base: true,
    },
    {
      provider: "openai",
      label: "OpenAI",
      default_api_base: "https://api.openai.com/v1",
      default_chat_model: "gpt-4o",
      default_embedding_model: "text-embedding-3-small",
      chat_models: ["gpt-4o", "gpt-4o-mini", "gpt-4.1", "gpt-4.1-mini"],
      embedding_models: ["text-embedding-3-small", "text-embedding-3-large", "text-embedding-ada-002"],
      requires_api_key: true,
      supports_custom_api_base: true,
    },
    {
      provider: "openai_compatible",
      label: "OpenAI Compatible",
      default_api_base: "",
      default_chat_model: "qwen3-max",
      default_embedding_model: "text-embedding-v4",
      chat_models: ["qwen3-max", "deepseek-chat", "gpt-4o-mini"],
      embedding_models: ["text-embedding-v4", "text-embedding-3-small"],
      requires_api_key: true,
      supports_custom_api_base: true,
    },
    {
      provider: "ollama",
      label: "Ollama",
      default_api_base: "http://localhost:11434",
      default_chat_model: "deepseek-r1:7b",
      default_embedding_model: "nomic-embed-text",
      chat_models: ["deepseek-r1:7b", "llama3.1", "qwen2.5"],
      embedding_models: ["nomic-embed-text", "mxbai-embed-large"],
      requires_api_key: false,
      supports_custom_api_base: true,
    },
  ],
  defaults: {
    provider: "dashscope",
    api_base: "https://dashscope.aliyuncs.com/compatible-mode/v1",
    chat_model: "qwen3-max",
    embedding_model: "text-embedding-v4",
  },
};

export default function APIKeysPage() {
  const [configs, setConfigs] = useState<ModelConfig[]>([]);
  const [options, setOptions] = useState<ProviderOptionsResponse>(DEFAULT_PROVIDER_OPTIONS);
  const [isLoading, setIsLoading] = useState(true);
  const [isSaving, setIsSaving] = useState(false);
  const [isEditorOpen, setIsEditorOpen] = useState(false);
  const [isProviderDialogOpen, setIsProviderDialogOpen] = useState(false);
  const [editingConfig, setEditingConfig] = useState<ModelConfig | null>(null);
  const [form, setForm] = useState<ModelConfigForm>({
    name: "",
    provider: DEFAULT_PROVIDER_OPTIONS.defaults.provider,
    api_key: "",
    api_base: DEFAULT_PROVIDER_OPTIONS.defaults.api_base,
    chat_model: DEFAULT_PROVIDER_OPTIONS.defaults.chat_model,
    embedding_model: DEFAULT_PROVIDER_OPTIONS.defaults.embedding_model,
    is_active: true,
  });
  const { toast } = useToast();

  const selectedProvider = useMemo(
    () => options.providers.find((item) => item.provider === form.provider),
    [form.provider, options.providers]
  );

  const fetchPageData = async () => {
    setIsLoading(true);
    try {
      const [providerData, configData] = await Promise.all([
        api.get("/api/model-configs/providers"),
        api.get("/api/model-configs"),
      ]);
      setOptions({
        providers: providerData.providers?.length ? providerData.providers : DEFAULT_PROVIDER_OPTIONS.providers,
        defaults: providerData.defaults || DEFAULT_PROVIDER_OPTIONS.defaults,
      });
      setConfigs(configData);
      if (!editingConfig) {
        setForm((current) => ({
          ...current,
          provider: providerData.defaults?.provider || DEFAULT_PROVIDER_OPTIONS.defaults.provider,
          api_base: providerData.defaults?.api_base || DEFAULT_PROVIDER_OPTIONS.defaults.api_base,
          chat_model: providerData.defaults?.chat_model || DEFAULT_PROVIDER_OPTIONS.defaults.chat_model,
          embedding_model:
            providerData.defaults?.embedding_model || DEFAULT_PROVIDER_OPTIONS.defaults.embedding_model,
        }));
      }
    } catch (error) {
      toast({
        title: "错误",
        description: "获取模型配置失败",
        variant: "destructive",
      });
    } finally {
      setIsLoading(false);
    }
  };

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

  const resetFormForCreate = () => {
    const defaults = options.defaults || DEFAULT_PROVIDER_OPTIONS.defaults;
    setEditingConfig(null);
    setForm({
      name: "",
      provider: defaults.provider,
      api_key: "",
      api_base: defaults.api_base,
      chat_model: defaults.chat_model,
      embedding_model: defaults.embedding_model,
      is_active: true,
    });
    setIsEditorOpen(true);
  };

  const openEditDialog = (config: ModelConfig) => {
    setEditingConfig(config);
    setForm({
      name: config.name,
      provider: config.provider,
      api_key: "",
      api_base: config.api_base || "",
      chat_model: config.chat_model,
      embedding_model: config.embedding_model,
      is_active: config.is_active,
    });
    setIsEditorOpen(true);
  };

  const updateProvider = (provider: string) => {
    const option = options.providers.find((item) => item.provider === provider);
    setForm((current) => ({
      ...current,
      provider,
      api_base: option?.default_api_base || "",
      chat_model: option?.default_chat_model || current.chat_model,
      embedding_model: option?.default_embedding_model || current.embedding_model,
    }));
  };

  const saveConfig = async () => {
    if (!form.name.trim()) {
      toast({ title: "错误", description: "请输入配置名称", variant: "destructive" });
      return;
    }
    if (!editingConfig && selectedProvider?.requires_api_key && !form.api_key.trim()) {
      toast({ title: "错误", description: "请输入 API 密钥", variant: "destructive" });
      return;
    }

    setIsSaving(true);
    try {
      const payload: Record<string, unknown> = {
        name: form.name.trim(),
        provider: form.provider,
        api_base: form.api_base.trim() || null,
        chat_model: form.chat_model.trim(),
        embedding_model: form.embedding_model.trim(),
        is_active: form.is_active,
      };
      if (form.api_key.trim()) {
        payload.api_key = form.api_key.trim();
      }

      if (editingConfig) {
        const updated = await api.put(`/api/model-configs/${editingConfig.id}`, payload);
        setConfigs((current) => current.map((item) => (item.id === updated.id ? updated : item)));
      } else {
        const created = await api.post("/api/model-configs", {
          ...payload,
          api_key: form.api_key.trim(),
        });
        setConfigs((current) => [created, ...current]);
      }

      setIsEditorOpen(false);
      toast({ title: "成功", description: "模型配置已保存" });
      fetchPageData();
    } catch (error: any) {
      toast({
        title: "错误",
        description: error?.message || "保存模型配置失败",
        variant: "destructive",
      });
    } finally {
      setIsSaving(false);
    }
  };

  const toggleActive = async (config: ModelConfig) => {
    try {
      const updated = await api.put(`/api/model-configs/${config.id}`, {
        is_active: !config.is_active,
      });
      setConfigs((current) =>
        current.map((item) =>
          item.id === updated.id
            ? updated
            : updated.is_active
              ? { ...item, is_active: false }
              : item
        )
      );
      toast({ title: "成功", description: "启用状态已更新" });
    } catch (error: any) {
      toast({
        title: "错误",
        description: error?.message || "更新启用状态失败",
        variant: "destructive",
      });
    }
  };

  const deleteConfig = async (id: number) => {
    try {
      await api.delete(`/api/model-configs/${id}`);
      setConfigs((current) => current.filter((item) => item.id !== id));
      toast({ title: "成功", description: "模型配置已删除" });
    } catch (error: any) {
      toast({
        title: "错误",
        description: error?.message || "删除模型配置失败",
        variant: "destructive",
      });
    }
  };

  const providerLabel = (provider: string) =>
    options.providers.find((item) => item.provider === provider)?.label || provider;

  const formatDate = (value: string | null) =>
    value ? new Date(value).toLocaleString("zh-CN") : "未使用";

  return (
    <DashboardLayout>
      <div className="container mx-auto py-10">
        <div className="mb-8 flex items-center justify-between">
          <div>
            <h1 className="text-2xl font-bold">API 密钥</h1>
          </div>
          <div className="flex gap-3">
            <Dialog open={isProviderDialogOpen} onOpenChange={setIsProviderDialogOpen}>
              <DialogTrigger asChild>
                <Button variant="outline">
                  <List className="mr-2 h-4 w-4" />
                  支持模型
                </Button>
              </DialogTrigger>
              <DialogContent className="max-w-2xl">
                <DialogHeader>
                  <DialogTitle>支持模型</DialogTitle>
                </DialogHeader>
                <div className="space-y-4">
                  {options.providers.map((provider) => (
                    <div key={provider.provider} className="rounded-md border p-4">
                      <div className="mb-3 flex items-center justify-between">
                        <div className="font-medium">{provider.label}</div>
                        <Badge variant={provider.requires_api_key ? "default" : "secondary"}>
                          {provider.requires_api_key ? "需要密钥" : "本地服务"}
                        </Badge>
                      </div>
                      <div className="grid gap-3 text-sm md:grid-cols-2">
                        <div>
                          <div className="mb-1 text-slate-500">语言模型</div>
                          <div className="flex flex-wrap gap-2">
                            {provider.chat_models.map((model) => (
                              <Badge key={model} variant="outline">
                                {model}
                              </Badge>
                            ))}
                          </div>
                        </div>
                        <div>
                          <div className="mb-1 text-slate-500">Embedding 模型</div>
                          <div className="flex flex-wrap gap-2">
                            {provider.embedding_models.map((model) => (
                              <Badge key={model} variant="outline">
                                {model}
                              </Badge>
                            ))}
                          </div>
                        </div>
                      </div>
                    </div>
                  ))}
                </div>
              </DialogContent>
            </Dialog>

            <Dialog open={isEditorOpen} onOpenChange={setIsEditorOpen}>
              <DialogTrigger asChild>
                <Button onClick={resetFormForCreate}>
                  <Plus className="mr-2 h-4 w-4" />
                  创建配置
                </Button>
              </DialogTrigger>
              <DialogContent className="max-w-xl">
                <DialogHeader>
                  <DialogTitle>{editingConfig ? "编辑模型配置" : "创建模型配置"}</DialogTitle>
                </DialogHeader>

                <div className="grid gap-4 py-4">
                  <div className="grid gap-2">
                    <Label htmlFor="name">配置名称</Label>
                    <Input
                      id="name"
                      value={form.name}
                      onChange={(event) => setForm({ ...form, name: event.target.value })}
                      placeholder="例如：我的 DashScope"
                    />
                  </div>

                  <div className="grid gap-2">
                    <Label>服务商</Label>
                    <select
                      value={form.provider}
                      onChange={(event) => updateProvider(event.target.value)}
                      className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2"
                    >
                      {options.providers.map((provider) => (
                        <option key={provider.provider} value={provider.provider}>
                          {provider.label}
                        </option>
                      ))}
                    </select>
                  </div>

                  <div className="grid gap-2">
                    <Label htmlFor="api-key">API 密钥</Label>
                    <Input
                      id="api-key"
                      type="password"
                      value={form.api_key}
                      onChange={(event) => setForm({ ...form, api_key: event.target.value })}
                      placeholder={editingConfig ? "留空则不修改" : "请输入 API 密钥"}
                    />
                  </div>

                  <div className="grid gap-2">
                    <Label htmlFor="api-base">API Base</Label>
                    <Input
                      id="api-base"
                      value={form.api_base}
                      onChange={(event) => setForm({ ...form, api_base: event.target.value })}
                      placeholder="https://dashscope.aliyuncs.com/compatible-mode/v1"
                    />
                  </div>

                  <div className="grid gap-4 md:grid-cols-2">
                    <div className="grid gap-2">
                      <Label htmlFor="chat-model">语言模型</Label>
                      <Input
                        id="chat-model"
                        list="chat-model-options"
                        value={form.chat_model}
                        onChange={(event) => setForm({ ...form, chat_model: event.target.value })}
                      />
                      <datalist id="chat-model-options">
                        {(selectedProvider?.chat_models || []).map((model) => (
                          <option key={model} value={model} />
                        ))}
                      </datalist>
                    </div>
                    <div className="grid gap-2">
                      <Label htmlFor="embedding-model">Embedding 模型</Label>
                      <Input
                        id="embedding-model"
                        list="embedding-model-options"
                        value={form.embedding_model}
                        onChange={(event) =>
                          setForm({ ...form, embedding_model: event.target.value })
                        }
                      />
                      <datalist id="embedding-model-options">
                        {(selectedProvider?.embedding_models || []).map((model) => (
                          <option key={model} value={model} />
                        ))}
                      </datalist>
                    </div>
                  </div>

                  <div className="flex items-center justify-between rounded-md border px-3 py-2">
                    <Label htmlFor="active">启用为默认配置</Label>
                    <Switch
                      id="active"
                      checked={form.is_active}
                      onCheckedChange={(value) => setForm({ ...form, is_active: value })}
                    />
                  </div>
                </div>

                <DialogFooter>
                  <Button onClick={saveConfig} disabled={isSaving}>
                    {isSaving && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
                    保存
                  </Button>
                </DialogFooter>
              </DialogContent>
            </Dialog>
          </div>
        </div>

        <div className="rounded-md border">
          <Table>
            <TableHeader>
              <TableRow>
                <TableHead>名称</TableHead>
                <TableHead>服务商</TableHead>
                <TableHead>语言模型</TableHead>
                <TableHead>Embedding 模型</TableHead>
                <TableHead>API 密钥</TableHead>
                <TableHead>状态</TableHead>
                <TableHead>最近使用</TableHead>
                <TableHead>操作</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {isLoading ? (
                <TableRow>
                  <TableCell colSpan={8} className="h-24 text-center text-slate-500">
                    加载中...
                  </TableCell>
                </TableRow>
              ) : configs.length === 0 ? (
                <TableRow>
                  <TableCell colSpan={8} className="h-24 text-center text-slate-500">
                    暂无模型 API 配置
                  </TableCell>
                </TableRow>
              ) : (
                configs.map((config) => (
                  <TableRow key={config.id}>
                    <TableCell className="font-medium">{config.name}</TableCell>
                    <TableCell>{providerLabel(config.provider)}</TableCell>
                    <TableCell className="font-mono text-sm">{config.chat_model}</TableCell>
                    <TableCell className="font-mono text-sm">{config.embedding_model}</TableCell>
                    <TableCell>
                      <div className="flex items-center gap-2 font-mono text-sm">
                        <KeyRound className="h-4 w-4 text-slate-400" />
                        {config.api_key_masked || "本地服务"}
                      </div>
                    </TableCell>
                    <TableCell>
                      <div className="flex items-center gap-2">
                        <Switch
                          checked={config.is_active}
                          onCheckedChange={() => toggleActive(config)}
                        />
                        {config.is_active && (
                          <Badge className="gap-1">
                            <CheckCircle2 className="h-3 w-3" />
                            默认
                          </Badge>
                        )}
                      </div>
                    </TableCell>
                    <TableCell>{formatDate(config.last_used_at)}</TableCell>
                    <TableCell>
                      <div className="flex gap-2">
                        <Button variant="outline" size="sm" onClick={() => openEditDialog(config)}>
                          <Edit className="mr-1 h-4 w-4" />
                          编辑
                        </Button>
                        <Button variant="destructive" size="sm" onClick={() => deleteConfig(config.id)}>
                          <Trash2 className="mr-1 h-4 w-4" />
                          删除
                        </Button>
                      </div>
                    </TableCell>
                  </TableRow>
                ))
              )}
            </TableBody>
          </Table>
        </div>
      </div>
    </DashboardLayout>
  );
}