import { useState } from "react";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Rocket, Bug, AlertTriangle, TrendingUp, Mail } from "lucide-react";
import { toast } from "sonner";
import Header from "@/components/Header";
import Footer from "@/components/Footer";

type ChangeType = "feature" | "fix" | "breaking" | "improvement";

interface Release {
  version: string;
  date: string;
  title: string;
  description: string;
  changes: ChangeType[];
}

const releases: Release[] = [
  {
    version: "2.4.0",
    date: "Apr 2, 2024",
    title: "Edge Functions & Global Deployments",
    description: "Deploy serverless functions to 30+ edge regions with automatic geo-routing. Includes new SDK methods for managing edge deployments and improved cold start times.",
    changes: ["feature", "improvement"],
  },
  {
    version: "2.3.1",
    date: "Mar 25, 2024",
    title: "Fix: Webhook Retry Logic",
    description: "Fixed an issue where webhook retries could fire duplicate events. Improved idempotency key handling and added exponential backoff.",
    changes: ["fix"],
  },
  {
    version: "2.3.0",
    date: "Mar 18, 2024",
    title: "v2 Authentication API",
    description: "New authentication API with support for OAuth 2.0, API key scopes, and token rotation. Breaking: v1 auth endpoints deprecated and will be removed in v3.",
    changes: ["feature", "breaking"],
  },
  {
    version: "2.2.2",
    date: "Mar 5, 2024",
    title: "Dashboard Performance & Bug Fixes",
    description: "Reduced dashboard load time by 40%. Fixed pagination bug on project listing and resolved timezone display issues in analytics.",
    changes: ["fix", "improvement"],
  },
  {
    version: "2.2.0",
    date: "Feb 20, 2024",
    title: "Real-Time Logs & Streaming",
    description: "Stream deployment logs in real time via the CLI or dashboard. New log filtering, search, and export capabilities with structured JSON output.",
    changes: ["feature", "improvement"],
  },
];

const typeConfig: Record<ChangeType, { label: string; color: string; icon: typeof Rocket }> = {
  feature: { label: "Feature", color: "bg-emerald-500/10 text-emerald-400 border-emerald-500/20", icon: Rocket },
  fix: { label: "Fix", color: "bg-sky-500/10 text-sky-400 border-sky-500/20", icon: Bug },
  breaking: { label: "Breaking", color: "bg-red-500/10 text-red-400 border-red-500/20", icon: AlertTriangle },
  improvement: { label: "Improvement", color: "bg-amber-500/10 text-amber-400 border-amber-500/20", icon: TrendingUp },
};

const filterOptions: { label: string; value: string }[] = [
  { label: "All", value: "all" },
  { label: "Features", value: "feature" },
  { label: "Fixes", value: "fix" },
  { label: "Breaking", value: "breaking" },
];

export default function ChangelogPage() {
  const [filter, setFilter] = useState("all");
  const [email, setEmail] = useState("");

  const filtered = filter === "all"
    ? releases
    : releases.filter((r) => r.changes.includes(filter as ChangeType));

  const handleSubscribe = (e: React.FormEvent) => {
    e.preventDefault();
    if (!email) return;
    toast.success("Subscribed to changelog updates!");
    setEmail("");
  };

  return (
    <div className="min-h-screen bg-slate-950 text-white antialiased">
      <Header />

      <div className="pt-32 pb-24 mx-auto max-w-3xl px-6">
        {/* Header */}
        <div className="text-center mb-12">
          <Badge className="mb-4 bg-emerald-500/10 text-emerald-400 border-emerald-500/20">Changelog</Badge>
          <h1 className="text-3xl font-bold tracking-tight sm:text-4xl animate-fade-up">What is new in DevStack</h1>
          <p className="mt-4 text-slate-400">All the latest updates, improvements, and fixes.</p>
        </div>

        {/* Subscribe */}
        <Card className="bg-slate-900/60 border-slate-800 mb-10">
          <CardContent className="p-6">
            <form onSubmit={handleSubscribe} className="flex flex-col sm:flex-row gap-3">
              <div className="flex items-center gap-2 flex-1">
                <Mail className="h-5 w-5 text-slate-500 flex-shrink-0" />
                <Input
                  type="email"
                  placeholder="you@company.com"
                  value={email}
                  onChange={(e) => setEmail(e.target.value)}
                  className="bg-slate-950 border-slate-700 text-white placeholder:text-slate-600 focus:border-emerald-500"
                />
              </div>
              <Button type="submit" className="rounded-full bg-emerald-500 hover:bg-emerald-400 text-slate-950 font-semibold active:scale-[0.98]">
                Subscribe to updates
              </Button>
            </form>
          </CardContent>
        </Card>

        {/* Filters */}
        <div className="flex flex-wrap gap-2 mb-10">
          {filterOptions.map((opt) => (
            <button
              key={opt.value}
              onClick={() => setFilter(opt.value)}
              className={`px-4 py-1.5 rounded-full text-sm font-medium transition-all ${
                filter === opt.value
                  ? "bg-emerald-500/10 text-emerald-400 ring-1 ring-emerald-500/30"
                  : "text-slate-400 hover:text-white hover:bg-slate-800"
              }`}
            >
              {opt.label}
            </button>
          ))}
        </div>

        {/* Release entries */}
        <div className="space-y-8 stagger">
          {filtered.map((release) => (
            <Card key={release.version} className="bg-slate-900/60 border-slate-800 hover:border-emerald-500/20 transition-all">
              <CardContent className="p-6">
                <div className="flex flex-wrap items-center gap-3 mb-4">
                  <Badge className="bg-emerald-500/10 text-emerald-400 border-emerald-500/20 font-mono">
                    v{release.version}
                  </Badge>
                  <span className="text-sm text-slate-500">{release.date}</span>
                  <div className="flex gap-2 ml-auto">
                    {release.changes.map((type) => {
                      const cfg = typeConfig[type];
                      return (
                        <Badge key={type} className={`text-xs ${cfg.color}`}>
                          <cfg.icon className="h-3 w-3 mr-1" />
                          {cfg.label}
                        </Badge>
                      );
                    })}
                  </div>
                </div>
                <h3 className="text-lg font-semibold text-white mb-2">{release.title}</h3>
                <p className="text-sm text-slate-400 leading-relaxed">{release.description}</p>
              </CardContent>
            </Card>
          ))}
        </div>

        {filtered.length === 0 && (
          <div className="text-center py-12">
            <p className="text-slate-500">No entries matching this filter.</p>
          </div>
        )}
      </div>

      <Footer />
    </div>
  );
}