"use client"

import { useState, useEffect } from "react"
import Link from "next/link"
import { useSearchParams } from "next/navigation"
import { useBetslipStore } from "@/lib/store/betslip-store"
import { mockEvents, popularLeagues, type Event } from "@/lib/mock-data"
import { useBettingStore } from "@/lib/store/betting-store"
import type { AppEvent } from "@/lib/store/betting-types"
import { SPORT_SLUG_TO_ID, getMarketsForTab, type ApiOdds, type MarketTabKey } from "@/lib/store/betting-api"
import { cn } from "@/lib/utils"
import { ChevronDown, BarChart2, TrendingUp, Plus, Loader2 } from "lucide-react"

function OddsButton({ odds, onClick, isSelected }: {
  odds: number
  onClick: () => void
  isSelected: boolean
}) {
  return (
    <button
      onClick={onClick}
      className={cn(
        "flex items-center justify-center py-2 px-0.5 border-r border-border/10 text-[10px] transition-all min-w-0 bg-brand-surface hover:bg-white/5 h-full",
        isSelected && "bg-brand-primary text-black font-bold border-none"
      )}
    >
      <span className={cn("font-bold tracking-tighter", isSelected ? "text-black" : "text-brand-primary")}>{odds.toFixed(2)}</span>
    </button>
  )
}

function EventRow({ event }: { event: Event | AppEvent }) {
  const { bets, addBet } = useBetslipStore()
  
  return (
    <div className="bg-brand-surface border-b border-border/20 hover:bg-white/5 transition-colors h-[38px] flex items-center">
       {/* Small Icons & ID Column */}
       <div className="flex items-center gap-1.5 px-2 w-[80px] shrink-0 border-r border-border/10 h-full">
         <BarChart2 className="size-3 text-muted-foreground hover:text-primary cursor-pointer shrink-0" />
         <TrendingUp className="size-3 text-muted-foreground hover:text-primary cursor-pointer shrink-0" />
         <span className="text-[9.5px] text-brand-primary font-bold tabular-nums italic ml-0.5">{event.id || "01682"}</span>
       </div>

       {/* Time & Team Column */}
       <div className="flex items-center gap-3 px-3 w-[240px] shrink-0 border-r border-border/10 h-full">
         <div className="flex flex-col text-[9.5px] font-bold text-white leading-tight italic shrink-0 w-[45px]">
            <span>11:00</span>
            <span className="text-white/40 uppercase font-medium">PM</span>
         </div>
         <span className="text-[10px] font-bold text-white truncate max-w-[180px]">{event.homeTeam} - {event.awayTeam}</span>
       </div>

       {/* Market Columns Grid (10 Markets) */}
       <div className="flex-1 grid grid-cols-10 h-full shrink-0">
          {event.markets.slice(0, 10).map((market) => {
             const betId = `${event.id}-${market.id}`
             const isSelected = bets.some((b) => b.id === betId)
             return (
              <OddsButton
                key={market.id}
                odds={market.odds}
                isSelected={isSelected}
                onClick={() => addBet({
                  id: betId,
                  event: `${event.homeTeam} - ${event.awayTeam}`,
                  league: `${event.sport} - ${event.country} - ${event.league}`,
                  market: "1X2",
                  selection: market.label,
                  odds: market.odds,
                })}
              />
             )
          })}
       </div>

       {/* More Markets Button -> match detail page */}
       <Link
         href={`/event/${event.id}`}
         className="w-10 flex items-center justify-center h-full hover:bg-white/5 transition-colors border-l border-border/10 group"
         aria-label="View all markets"
       >
          <Plus className="size-3 text-white group-hover:scale-110 transition-transform" />
       </Link>
    </div>
  )
}

const MARKET_HEADERS = ["1", "X", "2", "Over (2.5)", "Under (2.5)", "1X", "12", "X2", "Yes", "No"]

const ROW1_TABS: { key: MarketTabKey; label: string }[] = [
  { key: "main", label: "Main" },
  { key: "goals", label: "Goals" },
  { key: "handicap", label: "Handicap" },
  { key: "half_time", label: "Half Time / Full Time" },
  { key: "correct_score", label: "Correct Score" },
]
const ROW2_TABS: { key: MarketTabKey; label: string }[] = [
  { key: "1st_half", label: "1st Half" },
  { key: "2nd_half", label: "2nd Half" },
  { key: "combo", label: "Combo" },
  { key: "chance_mix", label: "Chance Mix" },
  { key: "home", label: "Home" },
]

export function EventsList({ filter = "All", sport: sportProp = "all", search = "" }: {
  filter?: string
  sport?: string
  search?: string
}) {
  const searchParams = useSearchParams()
  const leagueQuery = searchParams.get("league")
  const sportQuery = searchParams.get("sport") ?? sportProp
  const [selectedLeague, setSelectedLeague] = useState<string | null>(leagueQuery)
  const [activeTab, setActiveTab] = useState<MarketTabKey>("main")
  const { bets, addBet } = useBetslipStore()

  const sportId = sportQuery === "all" ? null : (SPORT_SLUG_TO_ID[sportQuery] ?? null)
  const leagueId = selectedLeague && !Number.isNaN(Number(selectedLeague)) ? selectedLeague : null
  const { events: apiEvents, loading, error, hasMore, loadMore, setFilters } = useBettingStore()

  useEffect(() => {
    setSelectedLeague(leagueQuery)
  }, [leagueQuery])

  useEffect(() => {
    setFilters(sportId, leagueId)
  }, [sportId, leagueId, setFilters])

  const handleClose = () => {
    const url = new URL(window.location.href)
    url.searchParams.delete("league")
    window.history.pushState({}, "", url)
    setSelectedLeague(null)
  }

  const useApi = !(error && apiEvents.length === 0)
  const events = useApi
    ? (filter === "Live" ? apiEvents.filter((e) => e.isLive) : apiEvents)
    : selectedLeague
      ? mockEvents.filter((e) => e.league.toLowerCase() === selectedLeague.toLowerCase())
      : mockEvents.filter((e) => {
          if (filter === "Live" && !e.isLive) return false
          if (sportProp !== "all" && e.sport.toLowerCase() !== sportProp.toLowerCase()) return false
          return true
        })
  const showLoadMore = useApi && hasMore && events.length > 0

  // Common Header Rendering
  const renderTableHeaders = () => (
    <>
      {/* Table Header Categories */}
      <div className="bg-brand-surface border-b border-border/40 grid grid-cols-5 text-[11px] font-bold text-white uppercase text-center items-center h-9">
         <div className="h-full flex items-center justify-center hover:bg-white/5 transition-colors cursor-pointer border-r border-border/20">Main</div>
         <div className="h-full flex items-center justify-center hover:bg-white/5 transition-colors cursor-pointer border-r border-border/20">Goals</div>
         <div className="h-full flex items-center justify-center hover:bg-white/5 transition-colors cursor-pointer border-r border-border/20">Handicap</div>
         <div className="h-full flex items-center justify-center hover:bg-white/5 transition-colors cursor-pointer border-r border-border/20 text-[9px] leading-tight">Half Time / Full Time</div>
         <div className="h-full flex items-center justify-center hover:bg-white/5 transition-colors cursor-pointer">Correct Score</div>
      </div>
      {/* Sub Headers */}
      <div className="bg-brand-surface border-b border-border/40 grid grid-cols-5 text-[10px] font-bold text-white uppercase text-center items-center h-8">
         <div className="h-full flex items-center justify-center hover:bg-white/5 transition-colors cursor-pointer border-r border-border/20">1st Half</div>
         <div className="h-full flex items-center justify-center hover:bg-white/5 transition-colors cursor-pointer border-r border-border/20">2nd Half</div>
         <div className="h-full flex items-center justify-center bg-brand-primary text-black border-r border-border/10">Combo</div>
         <div className="h-full flex items-center justify-center hover:bg-white/5 transition-colors cursor-pointer border-r border-border/20">Chance Mix</div>
         <div className="h-full flex items-center justify-center hover:bg-white/5 transition-colors cursor-pointer">Home</div>
      </div>
    </>
  )

  const getHeadersForTab = (tab: MarketTabKey) => {
    const first = events[0]
    const rawOdds: ApiOdds[] = first && "rawOdds" in first && Array.isArray((first as AppEvent).rawOdds) ? (first as AppEvent).rawOdds! : []
    return getMarketsForTab(rawOdds, tab).headers
  }

  const renderColumnHeaders = (tab: MarketTabKey, eventList: (Event | AppEvent)[]) => {
    let headers = eventList.length ? getHeadersForTab(tab) : getMarketsForTab([], tab).headers
    if (!headers.length) headers = getMarketsForTab([], "main").headers
    const n = Math.max(headers.length, 1)
    return (
      <div className="bg-brand-surface border-b border-white/5 flex flex-col">
        <div className="h-8 flex items-center text-[9px] font-black text-white/40 uppercase">
          <div className="w-[35px] shrink-0 px-1 border-r border-border/10 h-full flex items-center justify-center" />
          <div className="w-[45px] shrink-0 border-r border-border/10 h-full flex items-center justify-center">ID</div>
          <div className="w-[50px] shrink-0 border-r border-border/10 h-full flex items-center justify-center">Time</div>
          <div className="flex-1 min-w-0 px-3 border-r border-border/10 h-full flex items-center">Event</div>
          <div
            className="flex-1 grid text-center h-full items-center tracking-tighter border-r border-border/10"
            style={{ gridTemplateColumns: `repeat(${n}, minmax(0, 1fr))` }}
          >
            {headers.map((h, i) => (
              <span key={i} className="border-r border-white/5 last:border-r-0 px-0.5 truncate">
                {h}
              </span>
            ))}
          </div>
          <div className="w-10 shrink-0 border-l border-border/10 h-full" />
        </div>
      </div>
    )
  }

  const renderEventItem = (event: Event | AppEvent, tab: MarketTabKey) => {
    const hasRawOdds = event && "rawOdds" in event && Array.isArray((event as AppEvent).rawOdds)
    const rawOdds = hasRawOdds ? (event as AppEvent).rawOdds! : []
    const { cells } = getMarketsForTab(rawOdds, tab)
    const useMainMarkets = !hasRawOdds && event.markets?.length && (tab === "main" || tab === "combo" || tab === "chance_mix" || tab === "home")
    const displayCells = useMainMarkets
      ? event.markets.slice(0, 10).map((m, i) => ({ id: m.id, label: MARKET_HEADERS[i] ?? m.label, odds: m.odds }))
      : cells
    const n = Math.max(displayCells.length, 1)
    return (
      <div key={event.id} className="h-[34px] group flex items-center border-b border-white/5 bg-brand-bg hover:bg-white/5 transition-colors">
        <div className="w-[35px] flex items-center justify-center gap-1 px-2 border-r border-white/5 h-full opacity-40 group-hover:opacity-100">
          <BarChart2 className="size-3 cursor-pointer hover:text-primary" />
        </div>
        <div className="w-[45px] text-[10px] font-black text-brand-primary italic tabular-nums text-center border-r border-white/5 h-full flex items-center justify-center">
          {event.id}
        </div>
        <div className="w-[50px] flex flex-col items-center justify-center border-r border-white/5 h-full leading-none italic font-black text-[9px]">
          <span>{event.time}</span>
          <span className="text-[7px] text-white/30 uppercase mt-0.5">PM</span>
        </div>
        <Link
          href={`/event/${event.id}`}
          className="flex-1 px-4 text-[10.5px] font-black text-white truncate max-w-[200px] hover:text-brand-primary transition-colors"
        >
          {event.homeTeam} - {event.awayTeam}
        </Link>
        <div
          className="flex-1 grid h-full"
          style={{ gridTemplateColumns: `repeat(${n}, minmax(0, 1fr))` }}
        >
          {displayCells.map((cell) => {
            const betId = `${event.id}-${cell.id}`
            const isSelected = bets.some((b) => b.id === betId)
            const hasOdds = cell.odds > 0
            return (
              <button
                key={cell.id}
                type="button"
                disabled={!hasOdds}
                onClick={() =>
                  hasOdds &&
                  addBet({
                    id: betId,
                    event: `${event.homeTeam} - ${event.awayTeam}`,
                    league: `${event.sport} - ${event.country} - ${event.league}`,
                    market: cell.label,
                    selection: cell.label,
                    odds: cell.odds,
                  })
                }
                className={cn(
                  "flex items-center justify-center text-[10.5px] font-black tabular-nums transition-all border-r border-white/5",
                  isSelected ? "bg-brand-primary text-black" : "text-brand-primary hover:bg-white/5",
                  !hasOdds && "text-white/30 cursor-default hover:bg-transparent"
                )}
              >
                {hasOdds ? cell.odds.toFixed(2) : "—"}
              </button>
            )
          })}
        </div>
        <Link
          href={`/event/${event.id}`}
          className="w-10 flex items-center justify-center h-full hover:bg-white/5 transition-colors border-l border-white/5 text-white/40 hover:text-white"
          aria-label="View all markets"
        >
          <Plus className="size-3" />
        </Link>
      </div>
    )
  }

  if (loading && events.length === 0) {
    return (
      <div className="flex flex-col bg-brand-bg rounded overflow-hidden py-16 items-center justify-center gap-3">
        <Loader2 className="size-8 animate-spin text-brand-primary" aria-hidden />
        <p className="text-white/80 text-sm font-medium">Loading events and odds…</p>
        {/* <p className="text-white/50 text-xs">Resolving odds for each event</p> */}
      </div>
    )
  }

  if (error && apiEvents.length === 0 && events.length === 0) {
    return (
      <div className="flex flex-col bg-brand-bg rounded overflow-hidden py-8 px-4 text-center">
        <p className="text-white/60 text-sm mb-2">{error}</p>
        <p className="text-white/40 text-xs">Check NEXT_PUBLIC_BETTING_API_BASE_URL and tenant.</p>
      </div>
    )
  }

  if (selectedLeague) {
    // Group by date for league view
    const groupedEvents = events.reduce((acc, event) => {
      if (!acc[event.date]) acc[event.date] = []
      acc[event.date].push(event)
      return acc
    }, {} as Record<string, (Event | AppEvent)[]>)

    return (
      <div className="flex flex-col bg-brand-bg rounded overflow-hidden shadow-2xl">
        {/* League Header / Breadcrumbs */}
        <div className="bg-brand-surface px-3 py-2 flex items-center justify-between border-b border-border/20">
          <div className="flex items-center gap-2 text-[11px] font-bold text-white/60">
             <Plus className="size-3 cursor-pointer hover:text-white" />
             <div className="flex items-center gap-1.5">
                <span className="text-white font-black">•••</span>
                <span className="uppercase">Football</span>
                <span className="mx-1 opacity-20">|</span>
                <span className="text-white uppercase">{selectedLeague === "LaLiga" ? "Spain - LaLiga" : selectedLeague}</span>
             </div>
          </div>
          <button onClick={handleClose} className="text-white hover:text-primary transition-colors">
             <Plus className="size-5 rotate-45" />
          </button>
        </div>

        {/* Market category tabs row 1: Main, Goals, Handicap, Half Time / Full Time, Correct Score */}
        <div className="flex flex-wrap gap-1 p-2 pb-1 bg-brand-bg border-b border-border/10">
          {ROW1_TABS.map(({ key, label }) => (
            <button
              key={key}
              type="button"
              onClick={() => setActiveTab(key)}
              className={cn(
                "px-3 py-1.5 text-[10px] font-black uppercase rounded-sm transition-all",
                activeTab === key ? "bg-brand-primary text-black" : "text-white/60 hover:bg-brand-surface hover:text-white"
              )}
            >
              {label}
            </button>
          ))}
        </div>
        {/* Row 2: 1st Half, 2nd Half, Combo, Chance Mix, Home */}
        <div className="flex flex-wrap gap-1 px-2 pb-2 bg-brand-bg border-b border-border/10">
          {ROW2_TABS.map(({ key, label }) => (
            <button
              key={key}
              type="button"
              onClick={() => setActiveTab(key)}
              className={cn(
                "px-3 py-1.5 text-[10px] font-black uppercase rounded-sm transition-all",
                activeTab === key ? "bg-brand-primary text-black" : "text-white/60 hover:bg-brand-surface hover:text-white"
              )}
            >
              {label}
            </button>
          ))}
        </div>

        {/* Column Headers (dynamic by tab) */}
        {renderColumnHeaders(activeTab, events)}

        {/* Grouped Events */}
        <div className="overflow-y-auto max-h-[700px]">
          {Object.entries(groupedEvents).map(([date, dateEvents]) => (
            <div key={date} className="flex flex-col">
              <div className="bg-brand-surface px-2 py-1 text-[10px] font-black text-white border-b border-white/5">
                {date}
              </div>
              {dateEvents.map((event) => renderEventItem(event, activeTab))}
            </div>
          ))}
        </div>
        {showLoadMore && (
          <div className="p-3 border-t border-white/10">
            <button
              type="button"
              onClick={loadMore}
              disabled={loading}
              className="w-full py-2.5 text-[11px] font-bold uppercase text-brand-primary hover:bg-white/5 disabled:opacity-70 flex items-center justify-center gap-2"
            >
              {loading ? (
                <>
                  <Loader2 className="size-4 animate-spin shrink-0" aria-hidden />
                  Loading…
                </>
              ) : (
                "Load more"
              )}
            </button>
          </div>
        )}
      </div>
    )
  }

  // Home View (No League Selected)
  const homeEventsByLeague = events.reduce((acc, event) => {
    if (!acc[event.league]) acc[event.league] = []
    acc[event.league].push(event)
    return acc
  }, {} as Record<string, Event[]>)

  return (
    <div className="flex flex-col bg-brand-bg rounded overflow-hidden">
      {error && (
        <div className="px-3 py-1.5 bg-amber-500/20 border-b border-amber-500/30 text-amber-200 text-[10px]">
          Showing sample data. API: {error}
        </div>
      )}
      <div className="flex flex-col">
        {Object.entries(homeEventsByLeague).map(([leagueName, leagueEvents]) => (
          <div key={leagueName} className="flex flex-col border-b border-white/5 last:border-none">
            {/* League Box Header */}
            <div className="bg-brand-surface-light px-3 py-1.5 text-[10px] font-bold text-brand-primary uppercase border-y border-border/20 flex items-center justify-between">
              <div className="flex items-center gap-2">
                <span className="text-[14px]">
                  {popularLeagues.find(l => l.name === leagueName)?.icon || 
                   popularLeagues.find(l => l.id.toLowerCase() === leagueName.toLowerCase())?.icon || 
                   "⚽"}
                </span>
                <span>{leagueName === "LaLiga" ? "Spain - LaLiga" : 
                       leagueName === "Premier League" ? "England - Premier League" :
                       leagueName === "Bundesliga" ? "Germany - Bundesliga" :
                       leagueName === "Ligue 1" ? "France - Ligue 1" :
                       leagueName}</span>
              </div>
              <ChevronDown className="size-4 text-white" />
            </div>

            {/* Column Headers for each league box */}
            <div className="bg-brand-surface px-3 py-1 flex items-center text-[8px] font-black text-white/40 uppercase border-b border-border/20">
               <div className="w-[180px] flex gap-4">
                  <span className="w-5 text-center">Stats</span>
                  <span className="w-6">ID</span>
                  <span className="w-10">Time</span>
                  <span>Event</span>
               </div>
               <div className="flex-1 grid grid-cols-10 text-center tracking-tighter">
                  {MARKET_HEADERS.map(h => <span key={h}>{h}</span>)}
               </div>
               <div className="w-10" />
            </div>

            {/* Matches in this league */}
            <div className="flex flex-col">
              {leagueEvents.map((event) => renderEventItem(event, "main"))}
            </div>
          </div>
        ))}
      </div>
      {showLoadMore && (
        <div className="p-3 border-t border-white/10">
          <button
            type="button"
            onClick={loadMore}
            disabled={loading}
            className="w-full py-2.5 text-[11px] font-bold uppercase text-brand-primary hover:bg-white/5 disabled:opacity-70 flex items-center justify-center gap-2"
          >
            {loading ? (
              <>
                <Loader2 className="size-4 animate-spin shrink-0" aria-hidden />
                Loading…
              </>
            ) : (
              "Load more"
            )}
          </button>
        </div>
      )}
    </div>
  )
}