"use client";

import { useState } from "react";
import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
import { Settings, Cpu, RefreshCw, CheckCircle, XCircle, Play } from "lucide-react";
import { settingsAPI, adminAPI } from "@/lib/api";

const LLM_PROVIDERS = [
  { value: "openai", label: "OpenAI (GPT-4o)", hint: "Requires OPENAI_API_KEY in .env" },
  { value: "anthropic", label: "Anthropic (Claude)", hint: "Requires ANTHROPIC_API_KEY in .env" },
  { value: "gemini", label: "Google Gemini", hint: "Requires GEMINI_API_KEY in .env" },
  { value: "ollama", label: "Ollama (Local)", hint: "Requires Ollama running on host" },
];

export default function SettingsPage() {
  const qc = useQueryClient();
  const { data: settings, isLoading } = useQuery({
    queryKey: ["settings"],
    queryFn: () => settingsAPI.get(),
  });

  const updateSetting = useMutation({
    mutationFn: ({ key, value }: { key: string; value: string }) => settingsAPI.update(key, value),
    onSuccess: () => qc.invalidateQueries({ queryKey: ["settings"] }),
  });

  const [testResult, setTestResult] = useState<{ status: string; detail?: string; summary_preview?: string; provider?: string } | null>(null);
  const [testing, setTesting] = useState(false);
  const [taskIds, setTaskIds] = useState<Record<string, string>>({});

  const testLLM = async () => {
    setTesting(true);
    setTestResult(null);
    try {
      const result = await settingsAPI.testLLM();
      setTestResult(result);
    } catch (e: unknown) {
      setTestResult({ status: "error", detail: e instanceof Error ? e.message : String(e) });
    } finally {
      setTesting(false);
    }
  };

  const trigger = async (name: string, fn: () => Promise<{ task_id: string }>) => {
    const result = await fn();
    setTaskIds((prev) => ({ ...prev, [name]: result.task_id }));
  };

  if (isLoading) return <div className="text-center py-20 text-muted-foreground">Loading settings...</div>;

  return (
    <div className="space-y-8 max-w-2xl">
      <div>
        <h1 className="text-2xl font-bold flex items-center gap-2">
          <Settings className="w-5 h-5" /> Settings
        </h1>
        <p className="text-muted-foreground text-sm mt-1">Configure LLM provider and system settings</p>
      </div>

      {/* LLM Provider */}
      <section className="bg-card border border-border rounded-lg p-6 space-y-4">
        <h2 className="font-semibold flex items-center gap-2">
          <Cpu className="w-4 h-4" /> LLM Provider
        </h2>
        <p className="text-xs text-muted-foreground">
          Current: <strong>{settings?.llm_provider}</strong> / <strong>{settings?.llm_model}</strong>
        </p>
        <div className="space-y-2">
          {LLM_PROVIDERS.map(({ value, label, hint }) => (
            <label key={value} className="flex items-start gap-3 cursor-pointer">
              <input
                type="radio"
                name="provider"
                value={value}
                checked={settings?.llm_provider === value}
                onChange={() => updateSetting.mutate({ key: "llm_provider", value })}
                className="mt-0.5"
              />
              <div>
                <div className="text-sm font-medium">{label}</div>
                <div className="text-xs text-muted-foreground">{hint}</div>
              </div>
            </label>
          ))}
        </div>

        <div className="flex items-center gap-3 pt-2 border-t border-border">
          <button
            onClick={testLLM}
            disabled={testing}
            className="flex items-center gap-2 px-4 py-2 text-sm bg-primary text-primary-foreground rounded-md hover:bg-primary/90 disabled:opacity-50 transition-colors"
          >
            <Play className="w-3.5 h-3.5" />
            {testing ? "Testing..." : "Test Connection"}
          </button>
          {testResult && (
            <div className="flex items-center gap-2 text-sm">
              {testResult.status === "ok" ? (
                <>
                  <CheckCircle className="w-4 h-4 text-green-500" />
                  <span className="text-green-600 dark:text-green-400">
                    {testResult.provider}/{testResult.summary_preview?.slice(0, 50)}...
                  </span>
                </>
              ) : (
                <>
                  <XCircle className="w-4 h-4 text-red-500" />
                  <span className="text-red-600 dark:text-red-400">{testResult.detail}</span>
                </>
              )}
            </div>
          )}
        </div>
      </section>

      {/* Polling Settings */}
      <section className="bg-card border border-border rounded-lg p-6 space-y-4">
        <h2 className="font-semibold flex items-center gap-2">
          <RefreshCw className="w-4 h-4" /> Data Sources
        </h2>
        <div className="space-y-3 text-sm">
          <div className="flex items-center justify-between">
            <div>
              <div className="font-medium">Congress.gov Poll Interval</div>
              <div className="text-xs text-muted-foreground">How often to check for new bills</div>
            </div>
            <select
              value={settings?.congress_poll_interval_minutes}
              onChange={(e) => updateSetting.mutate({ key: "congress_poll_interval_minutes", value: e.target.value })}
              className="px-3 py-1.5 text-sm bg-background border border-border rounded-md"
            >
              <option value="15">Every 15 min</option>
              <option value="30">Every 30 min</option>
              <option value="60">Every hour</option>
              <option value="360">Every 6 hours</option>
            </select>
          </div>
          <div className="flex items-center justify-between py-2 border-t border-border">
            <div>
              <div className="font-medium">NewsAPI.org</div>
              <div className="text-xs text-muted-foreground">100 requests/day free tier</div>
            </div>
            <span className={`text-xs font-medium ${settings?.newsapi_enabled ? "text-green-500" : "text-muted-foreground"}`}>
              {settings?.newsapi_enabled ? "Configured" : "Not configured"}
            </span>
          </div>
          <div className="flex items-center justify-between py-2 border-t border-border">
            <div>
              <div className="font-medium">Google Trends</div>
              <div className="text-xs text-muted-foreground">Zeitgeist scoring via pytrends</div>
            </div>
            <span className={`text-xs font-medium ${settings?.pytrends_enabled ? "text-green-500" : "text-muted-foreground"}`}>
              {settings?.pytrends_enabled ? "Enabled" : "Disabled"}
            </span>
          </div>
        </div>
      </section>

      {/* Manual Controls */}
      <section className="bg-card border border-border rounded-lg p-6 space-y-4">
        <h2 className="font-semibold">Manual Controls</h2>
        <div className="flex flex-wrap gap-3">
          <button
            onClick={() => trigger("poll", adminAPI.triggerPoll)}
            className="flex items-center gap-2 px-4 py-2 text-sm bg-muted hover:bg-accent rounded-md transition-colors"
          >
            <RefreshCw className="w-3.5 h-3.5" /> Trigger Poll
          </button>
          <button
            onClick={() => trigger("members", adminAPI.triggerMemberSync)}
            className="flex items-center gap-2 px-4 py-2 text-sm bg-muted hover:bg-accent rounded-md transition-colors"
          >
            <RefreshCw className="w-3.5 h-3.5" /> Sync Members
          </button>
          <button
            onClick={() => trigger("trends", adminAPI.triggerTrendScores)}
            className="flex items-center gap-2 px-4 py-2 text-sm bg-muted hover:bg-accent rounded-md transition-colors"
          >
            <RefreshCw className="w-3.5 h-3.5" /> Calculate Trends
          </button>
        </div>
        {Object.entries(taskIds).map(([name, id]) => (
          <p key={name} className="text-xs text-muted-foreground">{name}: task {id} queued</p>
        ))}
      </section>
    </div>
  );
}