'use client'

import { useEffect, useState } from 'react'
import { useParams } from 'next/navigation'
import { Header } from '@/components/Header'
import { Footer } from '@/components/Footer'
import { api } from '@/lib/api'
import {
  ArrowLeft,
  TrendingUp,
  TrendingDown,
  Minus,
  Calendar,
  Globe,
  Building,
  DollarSign,
  ArrowRight,
  ExternalLink,
} from 'lucide-react'
import Link from 'next/link'
import clsx from 'clsx'

interface TldDetails {
  tld: string
  type: string
  description: string
  registry: string
  introduced: number
  trend: string
  trend_reason: string
  pricing: {
    avg: number
    min: number
    max: number
  }
  registrars: Array<{
    name: string
    registration_price: number
    renewal_price: number
    transfer_price: number
  }>
  cheapest_registrar: string
}

interface TldHistory {
  tld: string
  current_price: number
  price_change_7d: number
  price_change_30d: number
  price_change_90d: number
  history: Array<{
    date: string
    price: number
  }>
}

export default function TldDetailPage() {
  const params = useParams()
  const tld = params.tld as string
  
  const [details, setDetails] = useState<TldDetails | null>(null)
  const [history, setHistory] = useState<TldHistory | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    if (tld) {
      loadData()
    }
  }, [tld])

  const loadData = async () => {
    try {
      const [historyData, compareData] = await Promise.all([
        api.getTldHistory(tld, 90),
        api.getTldCompare(tld),
      ])
      
      // Build details from API data
      if (historyData && compareData) {
        const registrars = compareData.registrars || []
        const prices = registrars.map(r => r.registration_price)
        const avgPrice = prices.length > 0 ? prices.reduce((a, b) => a + b, 0) / prices.length : 0
        
        setDetails({
          tld: tld,
          type: 'generic',
          description: `Domain extension .${tld}`,
          registry: 'Various',
          introduced: 2020,
          trend: historyData.price_change_30d > 0 ? 'up' : historyData.price_change_30d < 0 ? 'down' : 'stable',
          trend_reason: 'Price tracking available',
          pricing: {
            avg: avgPrice,
            min: Math.min(...prices),
            max: Math.max(...prices),
          },
          registrars: registrars.sort((a, b) => a.registration_price - b.registration_price),
          cheapest_registrar: registrars[0]?.name || 'N/A',
        })
        setHistory(historyData)
      } else {
        setError('Failed to load TLD data')
      }
    } catch (err) {
      setError('Failed to load TLD data')
    } finally {
      setLoading(false)
    }
  }

  const getTrendIcon = (trend: string) => {
    switch (trend) {
      case 'up':
        return <TrendingUp className="w-5 h-5 text-warning" />
      case 'down':
        return <TrendingDown className="w-5 h-5 text-accent" />
      default:
        return <Minus className="w-5 h-5 text-foreground-subtle" />
    }
  }

  if (loading) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <div className="w-5 h-5 border-2 border-accent border-t-transparent rounded-full animate-spin" />
      </div>
    )
  }

  if (error || !details) {
    return (
      <div className="min-h-screen bg-background">
        <Header />
        <main className="pt-28 pb-16 px-4 sm:px-6">
          <div className="max-w-4xl mx-auto text-center">
            <p className="text-body-lg text-foreground-muted mb-4">{error || 'TLD not found'}</p>
            <Link
              href="/tld-pricing"
              className="inline-flex items-center gap-2 text-accent hover:text-accent-hover"
            >
              <ArrowLeft className="w-4 h-4" />
              Back to TLD Overview
            </Link>
          </div>
        </main>
      </div>
    )
  }

  return (
    <div className="min-h-screen bg-background relative">
      {/* Ambient glow */}
      <div className="fixed inset-0 pointer-events-none">
        <div className="absolute top-0 left-1/3 w-[500px] h-[400px] bg-accent/[0.02] rounded-full blur-3xl" />
      </div>

      <Header />

      <main className="relative pt-28 sm:pt-32 pb-16 sm:pb-20 px-4 sm:px-6">
        <div className="max-w-4xl mx-auto">
          {/* Back Link */}
          <Link
            href="/tld-pricing"
            className="inline-flex items-center gap-2 text-body-sm text-foreground-muted hover:text-foreground mb-8 transition-colors"
          >
            <ArrowLeft className="w-4 h-4" />
            All TLDs
          </Link>

          {/* Header */}
          <div className="mb-10 sm:mb-12 animate-fade-in">
            <div className="flex items-start justify-between gap-4 mb-4">
              <div>
                <h1 className="font-mono text-[3rem] sm:text-[4rem] md:text-[5rem] leading-none text-foreground mb-2">
                  .{details.tld}
                </h1>
                <p className="text-body-lg text-foreground-muted">{details.description}</p>
              </div>
              <div className="flex items-center gap-2 p-3 bg-background-secondary border border-border rounded-xl">
                {getTrendIcon(details.trend)}
                <span className={clsx(
                  "text-body-sm font-medium",
                  details.trend === 'up' ? "text-warning" :
                  details.trend === 'down' ? "text-accent" :
                  "text-foreground-muted"
                )}>
                  {details.trend === 'up' ? 'Rising' : details.trend === 'down' ? 'Falling' : 'Stable'}
                </span>
              </div>
            </div>
            <p className="text-body-sm text-foreground-subtle">{details.trend_reason}</p>
          </div>

          {/* Price Stats */}
          <div className="grid sm:grid-cols-3 gap-4 mb-10 sm:mb-12 animate-slide-up">
            <div className="p-5 sm:p-6 bg-background-secondary border border-border rounded-xl">
              <p className="text-ui-sm text-foreground-subtle mb-2">Average Price</p>
              <p className="text-heading-md sm:text-heading-lg font-medium text-foreground">
                ${details.pricing.avg.toFixed(2)}<span className="text-body-sm text-foreground-subtle">/yr</span>
              </p>
            </div>
            <div className="p-5 sm:p-6 bg-background-secondary border border-border rounded-xl">
              <p className="text-ui-sm text-foreground-subtle mb-2">Cheapest</p>
              <p className="text-heading-md sm:text-heading-lg font-medium text-accent">
                ${details.pricing.min.toFixed(2)}<span className="text-body-sm text-foreground-subtle">/yr</span>
              </p>
              <p className="text-ui-sm text-foreground-subtle mt-1">at {details.cheapest_registrar}</p>
            </div>
            <div className="p-5 sm:p-6 bg-background-secondary border border-border rounded-xl">
              <p className="text-ui-sm text-foreground-subtle mb-2">Price Range</p>
              <p className="text-heading-md sm:text-heading-lg font-medium text-foreground">
                ${details.pricing.min.toFixed(2)} - ${details.pricing.max.toFixed(2)}
              </p>
            </div>
          </div>

          {/* Price Changes */}
          {history && (
            <div className="mb-10 sm:mb-12 animate-slide-up delay-100">
              <h2 className="text-body-lg font-medium text-foreground mb-4">Price Changes</h2>
              <div className="grid grid-cols-3 gap-4">
                <div className="p-4 bg-background-secondary/50 border border-border rounded-xl text-center">
                  <p className="text-ui-sm text-foreground-subtle mb-1">7 Days</p>
                  <p className={clsx(
                    "text-body-lg font-medium",
                    history.price_change_7d > 0 ? "text-warning" :
                    history.price_change_7d < 0 ? "text-accent" :
                    "text-foreground-muted"
                  )}>
                    {history.price_change_7d > 0 ? '+' : ''}{history.price_change_7d.toFixed(2)}%
                  </p>
                </div>
                <div className="p-4 bg-background-secondary/50 border border-border rounded-xl text-center">
                  <p className="text-ui-sm text-foreground-subtle mb-1">30 Days</p>
                  <p className={clsx(
                    "text-body-lg font-medium",
                    history.price_change_30d > 0 ? "text-warning" :
                    history.price_change_30d < 0 ? "text-accent" :
                    "text-foreground-muted"
                  )}>
                    {history.price_change_30d > 0 ? '+' : ''}{history.price_change_30d.toFixed(2)}%
                  </p>
                </div>
                <div className="p-4 bg-background-secondary/50 border border-border rounded-xl text-center">
                  <p className="text-ui-sm text-foreground-subtle mb-1">90 Days</p>
                  <p className={clsx(
                    "text-body-lg font-medium",
                    history.price_change_90d > 0 ? "text-warning" :
                    history.price_change_90d < 0 ? "text-accent" :
                    "text-foreground-muted"
                  )}>
                    {history.price_change_90d > 0 ? '+' : ''}{history.price_change_90d.toFixed(2)}%
                  </p>
                </div>
              </div>
            </div>
          )}

          {/* Price Chart */}
          {history && history.history.length > 0 && (
            <div className="mb-10 sm:mb-12 animate-slide-up delay-150">
              <h2 className="text-body-lg font-medium text-foreground mb-4">90-Day Price History</h2>
              <div className="p-6 bg-background-secondary border border-border rounded-xl">
                <div className="h-40 flex items-end gap-0.5">
                  {history.history.map((point, i) => {
                    const prices = history.history.map(p => p.price)
                    const minPrice = Math.min(...prices)
                    const maxPrice = Math.max(...prices)
                    const range = maxPrice - minPrice || 1
                    const height = ((point.price - minPrice) / range) * 100
                    const isLast = i === history.history.length - 1
                    
                    return (
                      <div
                        key={i}
                        className={clsx(
                          "flex-1 rounded-t transition-all hover:opacity-80",
                          isLast ? "bg-accent" : "bg-accent/40"
                        )}
                        style={{ height: `${Math.max(height, 5)}%` }}
                        title={`${point.date}: $${point.price.toFixed(2)}`}
                      />
                    )
                  })}
                </div>
                <div className="flex justify-between mt-3 text-ui-sm text-foreground-subtle">
                  <span>{history.history[0]?.date}</span>
                  <span>Today</span>
                </div>
              </div>
            </div>
          )}

          {/* TLD Info */}
          <div className="mb-10 sm:mb-12 animate-slide-up delay-200">
            <h2 className="text-body-lg font-medium text-foreground mb-4">TLD Information</h2>
            <div className="grid sm:grid-cols-2 gap-4">
              <div className="flex items-center gap-4 p-4 bg-background-secondary/50 border border-border rounded-xl">
                <Globe className="w-5 h-5 text-foreground-subtle" />
                <div>
                  <p className="text-ui-sm text-foreground-subtle">Type</p>
                  <p className="text-body-sm text-foreground capitalize">{details.type}</p>
                </div>
              </div>
              <div className="flex items-center gap-4 p-4 bg-background-secondary/50 border border-border rounded-xl">
                <Building className="w-5 h-5 text-foreground-subtle" />
                <div>
                  <p className="text-ui-sm text-foreground-subtle">Registry</p>
                  <p className="text-body-sm text-foreground">{details.registry}</p>
                </div>
              </div>
              <div className="flex items-center gap-4 p-4 bg-background-secondary/50 border border-border rounded-xl">
                <Calendar className="w-5 h-5 text-foreground-subtle" />
                <div>
                  <p className="text-ui-sm text-foreground-subtle">Introduced</p>
                  <p className="text-body-sm text-foreground">{details.introduced}</p>
                </div>
              </div>
              <div className="flex items-center gap-4 p-4 bg-background-secondary/50 border border-border rounded-xl">
                <DollarSign className="w-5 h-5 text-foreground-subtle" />
                <div>
                  <p className="text-ui-sm text-foreground-subtle">Registrars</p>
                  <p className="text-body-sm text-foreground">{details.registrars.length} available</p>
                </div>
              </div>
            </div>
          </div>

          {/* Registrar Comparison */}
          <div className="mb-10 sm:mb-12 animate-slide-up delay-250">
            <h2 className="text-body-lg font-medium text-foreground mb-4">Registrar Comparison</h2>
            <div className="border border-border rounded-xl overflow-hidden">
              <table className="w-full">
                <thead>
                  <tr className="bg-background-secondary/50 border-b border-border">
                    <th className="text-left text-ui-sm text-foreground-subtle font-medium px-4 py-3">Registrar</th>
                    <th className="text-right text-ui-sm text-foreground-subtle font-medium px-4 py-3">Register</th>
                    <th className="text-right text-ui-sm text-foreground-subtle font-medium px-4 py-3 hidden sm:table-cell">Renew</th>
                    <th className="text-right text-ui-sm text-foreground-subtle font-medium px-4 py-3 hidden sm:table-cell">Transfer</th>
                  </tr>
                </thead>
                <tbody className="divide-y divide-border">
                  {details.registrars.map((registrar, i) => (
                    <tr key={registrar.name} className={clsx(
                      "transition-colors",
                      i === 0 ? "bg-accent/5" : "hover:bg-background-secondary/30"
                    )}>
                      <td className="px-4 py-3">
                        <div className="flex items-center gap-2">
                          <span className="text-body-sm text-foreground">{registrar.name}</span>
                          {i === 0 && (
                            <span className="text-ui-xs text-accent bg-accent-muted px-1.5 py-0.5 rounded">
                              Cheapest
                            </span>
                          )}
                        </div>
                      </td>
                      <td className="px-4 py-3 text-right">
                        <span className={clsx(
                          "text-body-sm font-medium",
                          i === 0 ? "text-accent" : "text-foreground"
                        )}>
                          ${registrar.registration_price.toFixed(2)}
                        </span>
                      </td>
                      <td className="px-4 py-3 text-right hidden sm:table-cell">
                        <span className="text-body-sm text-foreground-muted">
                          ${registrar.renewal_price.toFixed(2)}
                        </span>
                      </td>
                      <td className="px-4 py-3 text-right hidden sm:table-cell">
                        <span className="text-body-sm text-foreground-muted">
                          ${registrar.transfer_price.toFixed(2)}
                        </span>
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          </div>

          {/* CTA */}
          <div className="p-6 sm:p-8 bg-background-secondary border border-border rounded-xl text-center animate-slide-up delay-300">
            <h3 className="text-body-lg font-medium text-foreground mb-2">
              Monitor .{details.tld} Domains
            </h3>
            <p className="text-body-sm text-foreground-muted mb-6">
              Track availability and get notified when your target domains become available.
            </p>
            <Link
              href="/register"
              className="inline-flex items-center gap-2 px-6 py-3 bg-foreground text-background text-ui font-medium rounded-xl hover:bg-foreground/90 transition-all"
            >
              Start Monitoring
              <ArrowRight className="w-4 h-4" />
            </Link>
          </div>
        </div>
      </main>
      
      <Footer />
    </div>
  )
}