"use client";

import { useEffect, useState } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Badge } from "@/components/ui/badge";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { CheckCircle2, XCircle, Loader2, ExternalLink } from "lucide-react";

interface SettingsGroup {
  name: string;
  description: string;
  docsUrl: string;
  keys: string[];
}

interface SettingConfig {
  label: string;
  placeholder: string;
  secret?: boolean;
}

const SETTINGS_GROUPS: SettingsGroup[] = [
  {
    name: "Postiz",
    description:
      "Self-hosted social media scheduling. Handles Instagram and TikTok publishing.",
    docsUrl: "https://postiz.com",
    keys: ["POSTIZ_URL", "POSTIZ_API_KEY"],
  },
  {
    name: "Tavily",
    description:
      "AI-powered web research. Used by the Trend Scout and Research agents.",
    docsUrl: "https://tavily.com",
    keys: ["TAVILY_API_KEY"],
  },
  {
    name: "Gemini",
    description:
      "Google Gemini powers NanoBanana MCP for AI image generation in static ads. ~$0.04-0.13/image.",
    docsUrl: "https://aistudio.google.com/apikey",
    keys: ["GEMINI_API_KEY"],
  },
  {
    name: "Nextdoor",
    description:
      "Direct Nextdoor Ads API integration for local advertising.",
    docsUrl: "https://developer.nextdoor.com",
    keys: ["NEXTDOOR_API_TOKEN", "NEXTDOOR_ADVERTISER_ID"],
  },
];

const SETTINGS_CONFIG: Record<string, SettingConfig> = {
  POSTIZ_URL: { label: "Postiz URL", placeholder: "http://localhost:5000" },
  POSTIZ_API_KEY: {
    label: "Postiz API Key",
    placeholder: "your-postiz-api-key",
    secret: true,
  },
  TAVILY_API_KEY: {
    label: "Tavily API Key",
    placeholder: "tvly-...",
    secret: true,
  },
  GEMINI_API_KEY: {
    label: "Google Gemini API Key",
    placeholder: "AIza...",
    secret: true,
  },
  NEXTDOOR_API_TOKEN: {
    label: "Nextdoor API Token",
    placeholder: "your-nextdoor-token",
    secret: true,
  },
  NEXTDOOR_ADVERTISER_ID: {
    label: "Nextdoor Advertiser ID",
    placeholder: "your-advertiser-id",
  },
};

type IntegrationStatus = Record<
  string,
  { connected: boolean; error?: string }
>;

export default function SettingsPage() {
  const [settings, setSettings] = useState<Record<string, string>>({});
  const [status, setStatus] = useState<IntegrationStatus>({});
  const [editValues, setEditValues] = useState<Record<string, string>>({});
  const [saving, setSaving] = useState<string | null>(null);
  const [saved, setSaved] = useState<string | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    fetch("/api/settings?status=true")
      .then((r) => r.json())
      .then((data) => {
        setSettings(data.settings || {});
        setStatus(data.status || {});
        setLoading(false);
      })
      .catch(() => setLoading(false));
  }, []);

  async function handleSave(key: string) {
    const value = editValues[key];
    if (value === undefined) return;

    setSaving(key);
    const res = await fetch("/api/settings", {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ key, value }),
    });

    if (res.ok) {
      setSaved(key);
      // Refresh settings
      const data = await fetch("/api/settings?status=true").then((r) =>
        r.json()
      );
      setSettings(data.settings || {});
      setStatus(data.status || {});
      setEditValues((prev) => {
        const next = { ...prev };
        delete next[key];
        return next;
      });
      setTimeout(() => setSaved(null), 2000);
    }
    setSaving(null);
  }

  function getGroupStatus(group: SettingsGroup): {
    connected: boolean;
    error?: string;
  } {
    const key = group.name.toLowerCase();
    return status[key] || { connected: false, error: "Unknown" };
  }

  if (loading) {
    return (
      <div className="flex items-center justify-center py-20">
        <Loader2 className="h-6 w-6 animate-spin text-muted-foreground" />
      </div>
    );
  }

  return (
    <div className="space-y-6">
      <div>
        <h1 className="text-3xl font-bold">Settings</h1>
        <p className="text-muted-foreground mt-1">
          Configure your third-party integrations. Values are stored securely in
          the database and override environment variables.
        </p>
      </div>

      {SETTINGS_GROUPS.map((group) => {
        const groupStatus = getGroupStatus(group);

        return (
          <Card key={group.name}>
            <CardHeader>
              <div className="flex items-center justify-between">
                <div className="flex items-center gap-3">
                  <CardTitle>{group.name}</CardTitle>
                  {groupStatus.connected ? (
                    <Badge
                      variant="outline"
                      className="text-green-600 border-green-200 bg-green-50"
                    >
                      <CheckCircle2 className="h-3 w-3 mr-1" />
                      Connected
                    </Badge>
                  ) : (
                    <Badge
                      variant="outline"
                      className="text-amber-600 border-amber-200 bg-amber-50"
                    >
                      <XCircle className="h-3 w-3 mr-1" />
                      {groupStatus.error || "Not connected"}
                    </Badge>
                  )}
                </div>
                <a
                  href={group.docsUrl}
                  target="_blank"
                  rel="noopener noreferrer"
                  className="text-sm text-muted-foreground hover:text-foreground flex items-center gap-1"
                >
                  Docs
                  <ExternalLink className="h-3 w-3" />
                </a>
              </div>
              <CardDescription>{group.description}</CardDescription>
            </CardHeader>
            <CardContent className="space-y-4">
              {group.keys.map((key) => {
                const config = SETTINGS_CONFIG[key];
                const currentValue = settings[key] || "";
                const isEditing = key in editValues;
                const editValue = editValues[key] ?? "";

                return (
                  <div key={key} className="space-y-2">
                    <Label htmlFor={key}>{config.label}</Label>
                    <div className="flex gap-2">
                      <Input
                        id={key}
                        type={config.secret && !isEditing ? "password" : "text"}
                        placeholder={config.placeholder}
                        value={isEditing ? editValue : currentValue}
                        onChange={(e) =>
                          setEditValues((prev) => ({
                            ...prev,
                            [key]: e.target.value,
                          }))
                        }
                        onFocus={() => {
                          if (!isEditing) {
                            // Clear masked value on focus for secret fields
                            setEditValues((prev) => ({
                              ...prev,
                              [key]: "",
                            }));
                          }
                        }}
                      />
                      {isEditing && (
                        <Button
                          onClick={() => handleSave(key)}
                          disabled={saving === key}
                          size="sm"
                          className="shrink-0"
                        >
                          {saving === key ? (
                            <Loader2 className="h-4 w-4 animate-spin" />
                          ) : saved === key ? (
                            <CheckCircle2 className="h-4 w-4" />
                          ) : (
                            "Save"
                          )}
                        </Button>
                      )}
                      {isEditing && (
                        <Button
                          variant="ghost"
                          size="sm"
                          className="shrink-0"
                          onClick={() =>
                            setEditValues((prev) => {
                              const next = { ...prev };
                              delete next[key];
                              return next;
                            })
                          }
                        >
                          Cancel
                        </Button>
                      )}
                    </div>
                  </div>
                );
              })}
            </CardContent>
          </Card>
        );
      })}
    </div>
  );
}