import { Link, useParams } from 'react-router-dom'
import { useGenlocke } from '../hooks/useGenlockes'
import { usePokemonFamilies } from '../hooks/usePokemon'
import { GenlockeGraveyard, GenlockeLineage, StatCard, RuleBadges } from '../components'
import type { GenlockeLegDetail, RetiredPokemon, RunStatus } from '../types'
import { useMemo, useState } from 'react'

const statusColors: Record<RunStatus, string> = {
  completed: 'bg-blue-500',
  active: 'bg-green-500',
  failed: 'bg-red-500',
}

const statusRing: Record<RunStatus, string> = {
  completed: 'ring-accent-500',
  active: 'ring-green-500 animate-pulse',
  failed: 'ring-red-500',
}

const statusStyles: Record<RunStatus, string> = {
  active: 'bg-green-100 text-green-800 dark:bg-green-900/40 dark:text-green-300',
  completed: 'bg-blue-100 text-blue-800 dark:bg-blue-900/40 dark:text-blue-300',
  failed: 'bg-red-100 text-red-800 dark:bg-red-900/40 dark:text-red-300',
}

function LegIndicator({ leg }: { leg: GenlockeLegDetail }) {
  const hasRun = leg.runId !== null
  const status = leg.runStatus as RunStatus | null

  const dot = status ? (
    <div
      className={`w-4 h-4 rounded-full ${statusColors[status]} ring-2 ring-offset-2 ring-offset-white dark:ring-offset-gray-900 ${statusRing[status]}`}
    />
  ) : (
    <div className="w-4 h-4 rounded-full bg-surface-3" />
  )

  const content = (
    <div className="flex flex-col items-center gap-1 min-w-[80px]">
      {dot}
      <span className="text-xs font-medium text-text-secondary text-center leading-tight">
        {leg.game.name}
      </span>
      {status && <span className="text-[10px] text-text-tertiary capitalize">{status}</span>}
    </div>
  )

  if (hasRun) {
    return (
      <Link to={`/runs/${leg.runId}`} className="hover:opacity-80 transition-opacity">
        {content}
      </Link>
    )
  }

  return content
}

function PokemonSprite({ pokemon }: { pokemon: RetiredPokemon }) {
  if (pokemon.spriteUrl) {
    return (
      <img
        src={pokemon.spriteUrl}
        alt={pokemon.name}
        title={pokemon.name}
        className="w-10 h-10"
        loading="lazy"
      />
    )
  }
  return (
    <div
      className="w-10 h-10 rounded-full bg-surface-3 flex items-center justify-center text-sm font-bold"
      title={pokemon.name}
    >
      {pokemon.name[0]?.toUpperCase()}
    </div>
  )
}

export function GenlockeDetail() {
  const { genlockeId } = useParams<{ genlockeId: string }>()
  const id = Number(genlockeId)
  const { data: genlocke, isLoading, error } = useGenlocke(id)
  const { data: familiesData } = usePokemonFamilies()

  const [showGraveyard, setShowGraveyard] = useState(false)
  const [showLineage, setShowLineage] = useState(false)

  const activeLeg = useMemo(() => {
    if (!genlocke) return null
    return genlocke.legs.find((l) => l.runStatus === 'active') ?? null
  }, [genlocke])

  // Group retired Pokemon by leg, showing only the "base" Pokemon per family
  const retiredByLeg = useMemo(() => {
    if (!genlocke || !familiesData) return []
    const familyMap = new Map<number, number[]>()
    for (const family of familiesData.families) {
      for (const id of family) {
        familyMap.set(id, family)
      }
    }

    return genlocke.legs
      .filter((leg) => leg.retiredPokemonIds && leg.retiredPokemonIds.length > 0)
      .map((leg) => {
        // Find base Pokemon (lowest ID) for each family in this leg's retired list
        const seen = new Set<string>()
        const bases: number[] = []
        for (const pid of leg.retiredPokemonIds!) {
          const family = familyMap.get(pid)
          const key = family ? family.join(',') : String(pid)
          if (!seen.has(key)) {
            seen.add(key)
            bases.push(family ? Math.min(...family) : pid)
          }
        }
        return {
          legOrder: leg.legOrder,
          gameName: leg.game.name,
          pokemonIds: bases.sort((a, b) => a - b),
        }
      })
  }, [genlocke, familiesData])

  if (isLoading) {
    return (
      <div className="flex items-center justify-center py-12">
        <div className="w-8 h-8 border-4 border-blue-600 border-t-transparent rounded-full animate-spin" />
      </div>
    )
  }

  if (error || !genlocke) {
    return (
      <div className="max-w-4xl mx-auto p-8">
        <div className="rounded-lg bg-status-failed-bg p-4 text-status-failed">
          Failed to load genlocke. Please try again.
        </div>
      </div>
    )
  }

  const survivalRate =
    genlocke.stats.totalEncounters > 0
      ? Math.round(
          ((genlocke.stats.totalEncounters - genlocke.stats.totalDeaths) /
            genlocke.stats.totalEncounters) *
            100
        )
      : 0

  return (
    <div className="max-w-4xl mx-auto p-8 space-y-8">
      {/* Header */}
      <div>
        <Link to="/genlockes" className="text-sm text-text-link hover:underline">
          &larr; Back to Genlockes
        </Link>
        <div className="flex items-center gap-3 mt-2">
          <h1 className="text-3xl font-bold text-text-primary">{genlocke.name}</h1>
          <span
            className={`px-2.5 py-0.5 rounded-full text-xs font-medium capitalize ${statusStyles[genlocke.status]}`}
          >
            {genlocke.status}
          </span>
        </div>
      </div>

      {/* Progress Timeline */}
      <section>
        <h2 className="text-lg font-semibold text-text-primary mb-4">Progress</h2>
        <div className="bg-surface-1 rounded-lg shadow p-6">
          <div className="flex items-start gap-2 overflow-x-auto pb-2">
            {genlocke.legs.map((leg, i) => (
              <div key={leg.id} className="flex items-center">
                <LegIndicator leg={leg} />
                {i < genlocke.legs.length - 1 && (
                  <div
                    className={`h-0.5 w-6 mx-1 mt-[-16px] ${
                      leg.runStatus === 'completed' ? 'bg-blue-500' : 'bg-surface-3'
                    }`}
                  />
                )}
              </div>
            ))}
          </div>
        </div>
      </section>

      {/* Cumulative Stats */}
      <section>
        <h2 className="text-lg font-semibold text-text-primary mb-4">Cumulative Stats</h2>
        <div className="grid grid-cols-2 sm:grid-cols-4 gap-4">
          <StatCard label="Encounters" value={genlocke.stats.totalEncounters} color="blue" />
          <StatCard label="Deaths" value={genlocke.stats.totalDeaths} color="red" />
          <StatCard
            label="Legs Completed"
            value={genlocke.stats.legsCompleted}
            total={genlocke.stats.totalLegs}
            color="green"
          />
          <StatCard label="Survival Rate" value={survivalRate} color="purple" />
        </div>
      </section>

      {/* Configuration */}
      <section>
        <h2 className="text-lg font-semibold text-text-primary mb-4">Configuration</h2>
        <div className="bg-surface-1 rounded-lg shadow p-6 space-y-4">
          <div>
            <h3 className="text-sm font-medium text-text-tertiary mb-2">Genlocke Rules</h3>
            <div className="flex flex-wrap gap-1.5">
              {genlocke.genlockeRules.retireHoF ? (
                <span className="px-2 py-0.5 rounded-full text-xs font-medium bg-purple-100 text-purple-800 dark:bg-purple-900/40 dark:text-purple-300">
                  Retire HoF Teams
                </span>
              ) : (
                <span className="text-sm text-text-tertiary">
                  No genlocke-specific rules enabled
                </span>
              )}
            </div>
          </div>
          <div>
            <h3 className="text-sm font-medium text-text-tertiary mb-2">Nuzlocke Rules</h3>
            <RuleBadges rules={genlocke.nuzlockeRules} />
          </div>
        </div>
      </section>

      {/* Retired Families */}
      {genlocke.genlockeRules.retireHoF && retiredByLeg.length > 0 && (
        <section>
          <h2 className="text-lg font-semibold text-text-primary mb-4">Retired Families</h2>
          <div className="space-y-3">
            {retiredByLeg.map((leg) => (
              <div key={leg.legOrder} className="bg-surface-1 rounded-lg shadow p-4">
                <h3 className="text-sm font-medium text-text-tertiary mb-2">
                  Leg {leg.legOrder} &mdash; {leg.gameName}
                </h3>
                <div className="flex flex-wrap gap-1">
                  {leg.pokemonIds.map((pid) => {
                    const pokemon = genlocke.retiredPokemon[pid]
                    if (!pokemon) return null
                    return <PokemonSprite key={pid} pokemon={pokemon} />
                  })}
                </div>
              </div>
            ))}
          </div>
        </section>
      )}

      {/* Quick Actions */}
      <section>
        <h2 className="text-lg font-semibold text-text-primary mb-4">Quick Actions</h2>
        <div className="flex flex-wrap gap-3">
          {activeLeg && (
            <Link
              to={`/runs/${activeLeg.runId}`}
              className="px-4 py-2 bg-blue-600 text-white rounded-lg font-medium hover:bg-blue-700 transition-colors"
            >
              Go to Active Leg (Leg {activeLeg.legOrder})
            </Link>
          )}
          <button
            onClick={() => setShowGraveyard((v) => !v)}
            className={`px-4 py-2 rounded-lg font-medium transition-colors ${
              showGraveyard
                ? 'bg-red-600 text-white hover:bg-red-700'
                : 'bg-surface-3 text-text-secondary hover:bg-surface-4'
            }`}
          >
            Graveyard
          </button>
          <button
            onClick={() => setShowLineage((v) => !v)}
            className={`px-4 py-2 rounded-lg font-medium transition-colors ${
              showLineage
                ? 'bg-accent-600 text-white hover:bg-accent-500'
                : 'bg-surface-3 text-text-secondary hover:bg-surface-4'
            }`}
          >
            Lineage
          </button>
        </div>
      </section>

      {/* Graveyard */}
      {showGraveyard && (
        <section>
          <h2 className="text-lg font-semibold text-text-primary mb-4">Cumulative Graveyard</h2>
          <GenlockeGraveyard genlockeId={id} />
        </section>
      )}

      {/* Lineage */}
      {showLineage && (
        <section>
          <h2 className="text-lg font-semibold text-text-primary mb-4">Pokemon Lineages</h2>
          <GenlockeLineage genlockeId={id} />
        </section>
      )}
    </div>
  )
}