"use client";

import { useEffect, useState } from "react";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { TrendingUp, TrendingDown, Mail, MousePointer, Reply } from "lucide-react";
import { useApi } from "@/hooks/use-api";

interface CampaignMetrics {
  totalSent: number;
  delivered: number;
  opened: number;
  clicked: number;
  replied: number;
  bounced: number;
  deliveryRate: number;
  openRate: number;
  clickRate: number;
  replyRate: number;
}

interface AnalyticsDashboardProps {
  userId?: string;
}

export function AnalyticsDashboard({ userId }: AnalyticsDashboardProps) {
  const [metrics, setMetrics] = useState<CampaignMetrics | null>(null);
  const { get, loading } = useApi<CampaignMetrics>();

  useEffect(() => {
    async function fetchAnalytics() {
      const data = await get("/api/analytics");
      if (data) {
        setMetrics(data);
      }
    }

    fetchAnalytics();
  }, [get, userId]);

  if (loading) {
    return (
      <div className="space-y-6">
        <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
          {Array.from({ length: 4 }).map((_, i) => (
            <Card key={i}>
              <CardHeader className="space-y-2">
                <div className="h-4 w-24 bg-muted animate-pulse rounded" />
                <div className="h-8 w-32 bg-muted animate-pulse rounded" />
              </CardHeader>
            </Card>
          ))}
        </div>
      </div>
    );
  }

  // Default values if no data
  const data = metrics || {
    totalSent: 0,
    delivered: 0,
    opened: 0,
    clicked: 0,
    replied: 0,
    bounced: 0,
    deliveryRate: 0,
    openRate: 0,
    clickRate: 0,
    replyRate: 0,
  };

  return (
    <div className="space-y-6">
      <div>
        <h2 className="text-3xl font-bold tracking-tight">Analytics Dashboard</h2>
        <p className="text-muted-foreground">
          Track your email campaign performance and metrics
        </p>
      </div>

      <Tabs defaultValue="overview" className="space-y-4">
        <TabsList>
          <TabsTrigger value="overview">Overview</TabsTrigger>
          <TabsTrigger value="campaigns">Campaigns</TabsTrigger>
          <TabsTrigger value="engagement">Engagement</TabsTrigger>
        </TabsList>

        <TabsContent value="overview" className="space-y-4">
          {/* Key Metrics */}
          <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
            <Card>
              <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                <CardTitle className="text-sm font-medium">Emails Sent</CardTitle>
                <Mail className="h-4 w-4 text-muted-foreground" />
              </CardHeader>
              <CardContent>
                <div className="text-2xl font-bold">{data.totalSent.toLocaleString()}</div>
                <p className="text-xs text-muted-foreground">
                  {data.delivered} delivered ({data.deliveryRate.toFixed(1)}%)
                </p>
              </CardContent>
            </Card>

            <Card>
              <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                <CardTitle className="text-sm font-medium">Open Rate</CardTitle>
                {data.openRate > 25 ? (
                  <TrendingUp className="h-4 w-4 text-green-600" />
                ) : (
                  <TrendingDown className="h-4 w-4 text-red-600" />
                )}
              </CardHeader>
              <CardContent>
                <div className="text-2xl font-bold">{data.openRate.toFixed(1)}%</div>
                <p className="text-xs text-muted-foreground">
                  {data.opened} of {data.delivered} emails
                </p>
              </CardContent>
            </Card>

            <Card>
              <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                <CardTitle className="text-sm font-medium">Click Rate</CardTitle>
                <MousePointer className="h-4 w-4 text-muted-foreground" />
              </CardHeader>
              <CardContent>
                <div className="text-2xl font-bold">{data.clickRate.toFixed(1)}%</div>
                <p className="text-xs text-muted-foreground">
                  {data.clicked} clicks
                </p>
              </CardContent>
            </Card>

            <Card>
              <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
                <CardTitle className="text-sm font-medium">Reply Rate</CardTitle>
                <Reply className="h-4 w-4 text-muted-foreground" />
              </CardHeader>
              <CardContent>
                <div className="text-2xl font-bold">{data.replyRate.toFixed(1)}%</div>
                <p className="text-xs text-muted-foreground">
                  {data.replied} replies
                </p>
              </CardContent>
            </Card>
          </div>

          {/* Detailed Metrics */}
          <Card>
            <CardHeader>
              <CardTitle>Performance Breakdown</CardTitle>
              <CardDescription>Detailed metrics for your campaigns</CardDescription>
            </CardHeader>
            <CardContent className="space-y-4">
              <div className="space-y-2">
                <div className="flex items-center justify-between">
                  <span className="text-sm font-medium">Delivery Rate</span>
                  <span className="text-sm text-muted-foreground">{data.deliveryRate.toFixed(1)}%</span>
                </div>
                <div className="h-2 rounded-full bg-muted overflow-hidden">
                  <div
                    className="h-full bg-green-600 transition-all"
                    style={{ width: `${data.deliveryRate}%` }}
                  />
                </div>
              </div>

              <div className="space-y-2">
                <div className="flex items-center justify-between">
                  <span className="text-sm font-medium">Open Rate</span>
                  <span className="text-sm text-muted-foreground">{data.openRate.toFixed(1)}%</span>
                </div>
                <div className="h-2 rounded-full bg-muted overflow-hidden">
                  <div
                    className="h-full bg-blue-600 transition-all"
                    style={{ width: `${data.openRate}%` }}
                  />
                </div>
              </div>

              <div className="space-y-2">
                <div className="flex items-center justify-between">
                  <span className="text-sm font-medium">Click Rate</span>
                  <span className="text-sm text-muted-foreground">{data.clickRate.toFixed(1)}%</span>
                </div>
                <div className="h-2 rounded-full bg-muted overflow-hidden">
                  <div
                    className="h-full bg-purple-600 transition-all"
                    style={{ width: `${data.clickRate}%` }}
                  />
                </div>
              </div>

              <div className="space-y-2">
                <div className="flex items-center justify-between">
                  <span className="text-sm font-medium">Reply Rate</span>
                  <span className="text-sm text-muted-foreground">{data.replyRate.toFixed(1)}%</span>
                </div>
                <div className="h-2 rounded-full bg-muted overflow-hidden">
                  <div
                    className="h-full bg-orange-600 transition-all"
                    style={{ width: `${data.replyRate}%` }}
                  />
                </div>
              </div>

              {data.bounced > 0 && (
                <div className="pt-4 border-t">
                  <div className="flex items-center justify-between text-sm">
                    <span className="text-muted-foreground">Bounced Emails</span>
                    <span className="font-medium text-destructive">{data.bounced}</span>
                  </div>
                </div>
              )}
            </CardContent>
          </Card>
        </TabsContent>

        <TabsContent value="campaigns" className="space-y-4">
          <Card>
            <CardHeader>
              <CardTitle>Campaign Overview</CardTitle>
              <CardDescription>Performance metrics across all campaigns</CardDescription>
            </CardHeader>
            <CardContent>
              <div className="text-center py-8 text-muted-foreground">
                <p>Campaign comparison data will be available once you have multiple active campaigns.</p>
              </div>
            </CardContent>
          </Card>
        </TabsContent>

        <TabsContent value="engagement" className="space-y-4">
          <Card>
            <CardHeader>
              <CardTitle>Engagement Metrics</CardTitle>
              <CardDescription>Track how recipients interact with your emails</CardDescription>
            </CardHeader>
            <CardContent>
              <div className="space-y-4">
                <div className="grid gap-4 md:grid-cols-3">
                  <div className="space-y-2">
                    <p className="text-sm font-medium">Total Engagements</p>
                    <p className="text-3xl font-bold">{data.opened + data.clicked + data.replied}</p>
                  </div>
                  <div className="space-y-2">
                    <p className="text-sm font-medium">Unique Opens</p>
                    <p className="text-3xl font-bold">{data.opened}</p>
                  </div>
                  <div className="space-y-2">
                    <p className="text-sm font-medium">Link Clicks</p>
                    <p className="text-3xl font-bold">{data.clicked}</p>
                  </div>
                </div>
              </div>
            </CardContent>
          </Card>
        </TabsContent>
      </Tabs>
    </div>
  );
}