"use client";

import { useState } from "react";
import { useProviderConfigs, useUpdateProvider, useTestProvider } from "@/hooks/use-admin-providers";
import { useConfig } from "@/hooks/use-config";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Switch } from "@/components/ui/switch";
import { CheckCircle, XCircle, Loader2 } from "lucide-react";
import { ApiRequestError } from "@/lib/api";

const PROVIDER_FIELDS: Record<
  string,
  Array<{ key: string; label: string; type?: string; required?: boolean }>
> = {
  jellyfin: [
    { key: "base_url", label: "Base URL", required: true },
    { key: "api_key", label: "API Key", type: "password", required: true },
    { key: "user_id", label: "User ID", required: true },
  ],
  local_files: [
    { key: "files_dir", label: "Files Directory", required: true },
    { key: "transcode_dir", label: "Transcode Directory" },
    { key: "cleanup_ttl_hours", label: "Cleanup TTL Hours" },
  ],
};

interface ProviderCardProps {
  providerType: string;
  existingConfig?: { config_json: Record<string, string>; enabled: boolean };
}

function ProviderCard({ providerType, existingConfig }: ProviderCardProps) {
  const fields = PROVIDER_FIELDS[providerType] ?? [];
  const [formValues, setFormValues] = useState<Record<string, string>>(
    () => existingConfig?.config_json ?? {},
  );
  const [enabled, setEnabled] = useState(existingConfig?.enabled ?? true);
  const [conflictError, setConflictError] = useState(false);
  const [testResult, setTestResult] = useState<{ ok: boolean; message: string } | null>(null);

  const updateProvider = useUpdateProvider();
  const testProvider = useTestProvider();

  const handleSave = async () => {
    setConflictError(false);
    try {
      await updateProvider.mutateAsync({
        type: providerType,
        payload: { config_json: formValues, enabled },
      });
    } catch (e: unknown) {
      if (e instanceof ApiRequestError && e.status === 409) {
        setConflictError(true);
      }
    }
  };

  const handleTest = async () => {
    setTestResult(null);
    const result = await testProvider.mutateAsync({
      type: providerType,
      payload: { config_json: formValues, enabled: true },
    });
    setTestResult(result);
  };

  return (
    <Card className="border-zinc-800 bg-zinc-900">
      <CardHeader className="flex flex-row items-center justify-between pb-3">
        <CardTitle className="text-sm font-medium capitalize text-zinc-100">
          {providerType.replace("_", " ")}
        </CardTitle>
        <div className="flex items-center gap-2">
          <span className="text-xs text-zinc-400">Enabled</span>
          <Switch checked={enabled} onCheckedChange={setEnabled} />
        </div>
      </CardHeader>
      <CardContent className="space-y-3">
        {conflictError && (
          <div className="rounded border border-yellow-600/40 bg-yellow-950/30 px-3 py-2 text-xs text-yellow-400">
            UI config disabled — set <code>CONFIG_SOURCE=db</code> on the server
          </div>
        )}
        {fields.map((field) => (
          <div key={field.key} className="space-y-1">
            <Label className="text-xs text-zinc-400">
              {field.label}
              {field.required && <span className="ml-1 text-red-400">*</span>}
            </Label>
            <Input
              type={field.type ?? "text"}
              value={formValues[field.key] ?? ""}
              onChange={(e) =>
                setFormValues((prev) => ({ ...prev, [field.key]: e.target.value }))
              }
              placeholder={
                field.type === "password" ? "••••••••" : `Enter ${field.label.toLowerCase()}`
              }
              className="h-8 border-zinc-700 bg-zinc-800 text-xs text-zinc-100"
            />
          </div>
        ))}
        {testResult && (
          <div
            className={`flex items-center gap-2 rounded px-3 py-2 text-xs ${
              testResult.ok
                ? "bg-green-950/30 text-green-400"
                : "bg-red-950/30 text-red-400"
            }`}
          >
            {testResult.ok ? (
              <CheckCircle className="h-3.5 w-3.5" />
            ) : (
              <XCircle className="h-3.5 w-3.5" />
            )}
            {testResult.message}
          </div>
        )}
        <div className="flex gap-2 pt-1">
          <Button
            variant="outline"
            size="sm"
            onClick={handleTest}
            disabled={testProvider.isPending}
            className="border-zinc-700 text-xs"
          >
            {testProvider.isPending && <Loader2 className="mr-1 h-3 w-3 animate-spin" />}
            Test Connection
          </Button>
          <Button
            size="sm"
            onClick={handleSave}
            disabled={updateProvider.isPending}
            className="text-xs"
          >
            {updateProvider.isPending && <Loader2 className="mr-1 h-3 w-3 animate-spin" />}
            Save
          </Button>
        </div>
      </CardContent>
    </Card>
  );
}

export function ProviderSettingsPanel() {
  const { data: config } = useConfig();
  const { data: providerConfigs = [] } = useProviderConfigs();

  const availableTypes = config?.available_provider_types ?? [];

  return (
    <div className="space-y-4 p-6">
      <div>
        <h2 className="text-sm font-semibold text-zinc-100">Provider Configuration</h2>
        <p className="mt-0.5 text-xs text-zinc-500">
          Configure media providers. Requires <code>CONFIG_SOURCE=db</code> on the server.
        </p>
      </div>
      {availableTypes.length === 0 ? (
        <p className="text-xs text-zinc-500">No providers available in this build.</p>
      ) : (
        <div className="space-y-4">
          {availableTypes.map((type) => {
            const existing = providerConfigs.find((c) => c.provider_type === type);
            return (
              <ProviderCard
                key={type}
                providerType={type}
                existingConfig={existing}
              />
            );
          })}
        </div>
      )}
    </div>
  );
}