import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { questApi } from '../api/endpoints';
import { Scroll, CheckCircle, Circle, Trophy, ChevronDown, ChevronRight, Star, Coins, Swords, Lock } from 'lucide-react';
import { useState, useMemo } from 'react';

const OBJ_LABELS: Record<string, string> = {
  kill_monster: 'Tuer',
  kill_any: 'Gagner des combats',
  gather_material: 'Récolter',
  craft_item: 'Crafter',
  forge_item: 'Forger',
};

function useInvalidateQuests() {
  const qc = useQueryClient();
  return () => {
    qc.invalidateQueries({ queryKey: ['quests'] });
    qc.invalidateQueries({ queryKey: ['questsActive'] });
    qc.invalidateQueries({ queryKey: ['questsAvailable'] });
    qc.invalidateQueries({ queryKey: ['questsCompleted'] });
    qc.invalidateQueries({ queryKey: ['questArcs'] });
    qc.invalidateQueries({ queryKey: ['character'] });
  };
}

function QuestCard({ pq, mode }: { pq: any; mode: 'active' | 'available' | 'completed' }) {
  const invalidateAll = useInvalidateQuests();
  const quest = mode === 'active' ? pq.quest : pq;
  const progress = mode === 'active' ? pq.progress : 0;
  const status = mode === 'active' ? pq.status : 'available';
  const pct = Math.min(100, Math.floor((progress / quest.objectiveCount) * 100));

  const acceptMut = useMutation({
    mutationFn: () => questApi.accept(quest.id),
    onSuccess: invalidateAll,
  });

  const claimMut = useMutation({
    mutationFn: () => questApi.claim(pq.id),
    onSuccess: invalidateAll,
  });

  const abandonMut = useMutation({
    mutationFn: () => questApi.abandon(pq.id),
    onSuccess: invalidateAll,
  });

  const isCompleted = status === 'completed';
  const isClaimed = status === 'claimed';

  return (
    <div className={`card ${isCompleted ? 'card-gold' : ''} py-3 px-4`}>
      <div className="flex justify-between items-start mb-1">
        <div className="flex-1">
          <div className="flex items-center gap-1.5">
            {isClaimed ? <CheckCircle size={14} className="text-rpg-green" /> : isCompleted ? <Trophy size={14} className="text-rpg-gold" /> : <Circle size={13} className="text-rpg-muted" />}
            <span className={`font-bold text-[13px] ${isCompleted ? 'text-rpg-gold' : 'text-rpg-text'}`}>{quest.name}</span>
            {quest.repeatable && <span className="text-[9px] text-rpg-blue bg-[#1a2540] px-1.5 py-px rounded">répétable</span>}
          </div>
          <p className="mt-1 mb-0 text-[11px] text-rpg-muted">{quest.description}</p>
        </div>
      </div>

      {/* Objectif */}
      <div className="text-[11px] text-[#9ca3af] mt-1.5 mb-1">
        {OBJ_LABELS[quest.objectiveType] ?? quest.objectiveType} — {mode === 'active' ? `${progress}/${quest.objectiveCount}` : `×${quest.objectiveCount}`}
      </div>

      {/* Progress bar (active quests only) */}
      {mode === 'active' && (
        <div className="bar-track mb-1.5" style={{ height: 6 }}>
          <div className={isCompleted ? 'bar-fill-xp' : 'bar-fill-end'} style={{ width: `${pct}%` }} />
        </div>
      )}

      {/* Rewards */}
      <div className="flex gap-3 text-[11px] text-rpg-muted mb-1.5">
        <span className="flex items-center gap-1"><Star size={10} className="text-rpg-purple" /> {quest.rewardXp} XP</span>
        <span className="flex items-center gap-1"><Coins size={10} className="text-rpg-gold" /> {quest.rewardGold} or</span>
        {quest.rewardTitle && <span className="text-rpg-gold">🏅 {quest.rewardTitle}</span>}
        {quest.minLevel > 1 && <span>Niv. {quest.minLevel}+</span>}
      </div>

      {/* Actions */}
      {mode === 'available' && (
        <button className="btn btn-ghost text-[11px] py-1 px-3" disabled={acceptMut.isPending} onClick={() => acceptMut.mutate()}>
          {acceptMut.isPending ? 'Acceptation…' : '+ Accepter'}
        </button>
      )}
      {mode === 'active' && isCompleted && (
        <button className="btn btn-gold text-[11px] py-1 px-3" disabled={claimMut.isPending} onClick={() => claimMut.mutate()}>
          {claimMut.isPending ? 'Réclamation…' : '🎁 Réclamer la récompense'}
        </button>
      )}
      {mode === 'active' && !isCompleted && (
        <button className="btn btn-ghost text-[10px] py-0.5 px-2 text-rpg-muted" disabled={abandonMut.isPending} onClick={() => abandonMut.mutate()}>
          {abandonMut.isPending ? '…' : '✕ Abandonner'}
        </button>
      )}
      {acceptMut.isError && <p className="text-rpg-red text-[11px] mt-1">{(acceptMut.error as Error).message}</p>}
      {claimMut.isError && <p className="text-rpg-red text-[11px] mt-1">{(claimMut.error as Error).message}</p>}
      {abandonMut.isError && <p className="text-rpg-red text-[11px] mt-1">{(abandonMut.error as Error).message}</p>}
    </div>
  );
}

function ArcQuestRow({ q }: { q: any }) {
  const qc = useQueryClient();

  const acceptMut = useMutation({
    mutationFn: () => questApi.accept(q.id),
    onSuccess: () => {
      qc.invalidateQueries({ queryKey: ['questArcs'] });
      qc.invalidateQueries({ queryKey: ['questsActive'] });
    },
  });

  const claimMut = useMutation({
    mutationFn: () => questApi.claim(q.playerQuestId),
    onSuccess: () => {
      qc.invalidateQueries({ queryKey: ['questArcs'] });
      qc.invalidateQueries({ queryKey: ['questsActive'] });
      qc.invalidateQueries({ queryKey: ['character'] });
    },
  });

  return (
    <div className="flex items-center gap-2 text-xs py-1 border-b border-[#1a2030]">
      {q.playerStatus === 'claimed'
        ? <CheckCircle size={12} className="text-rpg-green shrink-0" />
        : q.playerStatus === 'completed'
          ? <Trophy size={12} className="text-rpg-gold shrink-0" />
          : q.playerStatus === 'active'
            ? <Swords size={12} className="text-rpg-blue shrink-0" />
            : <Circle size={11} className="text-[#3a4560] shrink-0" />
      }
      <div className="flex-1 min-w-0">
        <span className={
          q.playerStatus === 'claimed' ? 'text-rpg-green' : q.playerStatus === 'active' ? 'text-rpg-text' : 'text-rpg-muted'
        }>{q.name}</span>
        {q.playerStatus === 'active' && (
          <span className="text-[10px] text-rpg-blue ml-1.5">{q.progress}/{q.objectiveCount}</span>
        )}
      </div>
      <span className="text-[10px] text-rpg-muted">{q.rewardXp} XP</span>
      {q.minLevel > 1 && !q.levelOk && <span className="text-[9px] text-rpg-red">Niv.{q.minLevel}</span>}

      {/* Actions */}
      {q.canAccept && (
        <button className="btn btn-ghost text-[10px] py-px px-1.5" disabled={acceptMut.isPending} onClick={() => acceptMut.mutate()}>
          {acceptMut.isPending ? '...' : '+ Accepter'}
        </button>
      )}
      {q.playerStatus === 'completed' && (
        <button className="btn btn-gold text-[10px] py-px px-1.5" disabled={claimMut.isPending} onClick={() => claimMut.mutate()}>
          {claimMut.isPending ? '...' : '🎁 Réclamer'}
        </button>
      )}
      {acceptMut.isError && <span className="text-rpg-red text-[9px]">{(acceptMut.error as Error).message}</span>}
    </div>
  );
}

/** Détermine si un arc doit être ouvert par défaut */
function shouldArcBeOpen(arc: any): boolean {
  if (!arc.zoneUnlocked) return false;
  if (arc.completed) return false;
  // Ouvert si au moins une quête est active ou prête à réclamer
  return arc.quests.some((q: any) => q.playerStatus === 'active' || q.playerStatus === 'completed');
}

function ArcSection({ arc, defaultOpen }: { arc: any; defaultOpen: boolean }) {
  const [open, setOpen] = useState(defaultOpen);
  const { completed, total } = arc.progress;
  const locked = !arc.zoneUnlocked;
  const pct = total > 0 ? Math.floor((completed / total) * 100) : 0;

  return (
    <div className={`card ${locked ? '' : arc.completed ? '' : 'card-gold'} py-3 px-4 mb-2 ${locked ? 'opacity-40' : ''}`}>
      <div
        className={`flex items-center gap-2 cursor-pointer ${open && !locked ? 'mb-2' : ''}`}
        onClick={() => setOpen(!open)}
      >
        {locked ? <Lock size={14} className="text-rpg-muted shrink-0" /> : open ? <ChevronDown size={14} className="text-rpg-muted shrink-0" /> : <ChevronRight size={14} className="text-rpg-muted shrink-0" />}
        <Scroll size={14} className={`shrink-0 ${arc.completed ? 'text-rpg-green' : locked ? 'text-rpg-muted' : 'text-rpg-gold'}`} />
        <span className={`font-bold text-sm flex-1 ${arc.completed ? 'text-rpg-green' : locked ? 'text-rpg-muted' : 'text-rpg-gold'}`}>
          {arc.name}
        </span>
        <span className="text-[11px] text-rpg-muted">{completed}/{total}</span>
        {arc.completed && <CheckCircle size={14} className="text-rpg-green shrink-0" />}
        {locked && <span className="text-[10px] text-rpg-muted">🔒 Complétez l'arc précédent</span>}
      </div>

      {/* Progress bar */}
      {!locked && (
        <div className="bar-track mb-2" style={{ height: 4 }}>
          <div className={arc.completed ? 'bar-fill-hp' : 'bar-fill-xp'} style={{ width: `${pct}%`, background: arc.completed ? '#3ddc84' : undefined }} />
        </div>
      )}

      {open && !locked && (
        <>
          <p className="text-[11px] text-rpg-muted mb-2 pl-7">{arc.description}</p>
          <div className="flex flex-col pl-3">
            {arc.quests.map((q: any) => <ArcQuestRow key={q.id} q={q} />)}
          </div>
        </>
      )}
    </div>
  );
}

export function QuestPage() {
  const { data: active, isLoading: loadActive } = useQuery({ queryKey: ['questsActive'], queryFn: questApi.active });
  const { data: available, isLoading: loadAvail } = useQuery({ queryKey: ['questsAvailable'], queryFn: questApi.available });
  const { data: arcs } = useQuery({ queryKey: ['questArcs'], queryFn: questApi.arcs });
  const [showAllCombat, setShowAllCombat] = useState(false);

  // Pré-calculer quels arcs sont ouverts par défaut (stable entre renders)
  const arcDefaultOpen = useMemo(() => {
    if (!arcs) return {};
    const map: Record<string, boolean> = {};
    for (const arc of arcs) {
      map[arc.id] = shouldArcBeOpen(arc);
    }
    return map;
  }, [arcs]);

  if (loadActive || loadAvail) return <div className="p-8 text-rpg-muted">Chargement…</div>;

  const isCraftQuest = (q: any) => ['forge_item', 'craft_item'].includes(q.objectiveType ?? q.quest?.objectiveType);
  const isCombatQuest = (q: any) => !isCraftQuest(q);

  const activeAll = active ?? [];
  const activeCombat = activeAll.filter((pq: any) => !pq.quest.repeatable && isCombatQuest(pq));
  const activeCraft = activeAll.filter((pq: any) => !pq.quest.repeatable && isCraftQuest(pq));
  const activeDaily = activeAll.filter((pq: any) => pq.quest.repeatable);

  const availableAll = available ?? [];
  const availableCombat = availableAll.filter((q: any) => !q.repeatable && isCombatQuest(q));
  const availableCraft = availableAll.filter((q: any) => !q.repeatable && isCraftQuest(q));
  const availableDaily = availableAll.filter((q: any) => q.repeatable);
  const shownCombat = showAllCombat ? availableCombat : availableCombat.slice(0, 3);
  const hiddenCount = availableCombat.length - 3;

  return (
    <div>
      <h2 className="mb-4 text-rpg-gold text-xl font-bold">📜 Quêtes</h2>

      <div className="grid-2">
        {/* Active combat quests */}
        <div>
          <p className="mb-2 text-xs font-bold text-rpg-muted uppercase">
            Quêtes actives ({activeCombat.length}/3)
          </p>
          {activeCombat.length > 0 ? (
            <div className="flex flex-col gap-1.5">
              {activeCombat.map((pq: any) => <QuestCard key={pq.id} pq={pq} mode="active" />)}
            </div>
          ) : (
            <div className="card py-6 text-center text-rpg-muted text-[13px]">
              Aucune quête active — acceptez-en à droite
            </div>
          )}
        </div>

        {/* Available combat quests */}
        <div>
          <p className="mb-2 text-xs font-bold text-rpg-muted uppercase">
            Quêtes de combat
          </p>
          {shownCombat.length > 0 ? (
            <div className="flex flex-col gap-1.5">
              {shownCombat.map((q: any) => <QuestCard key={q.id} pq={q} mode="available" />)}
              {hiddenCount > 0 && (
                <button
                  className="btn btn-ghost w-full text-[11px] py-1 mt-0.5"
                  onClick={() => setShowAllCombat(!showAllCombat)}
                >
                  {showAllCombat ? 'Réduire' : `Voir tout (+${hiddenCount} quête${hiddenCount > 1 ? 's' : ''})`}
                </button>
              )}
            </div>
          ) : (
            <div className="card py-6 text-center text-rpg-muted text-[13px]">
              Toutes les quêtes de combat sont complétées
            </div>
          )}
        </div>
      </div>

      {/* Métiers */}
      {(activeCraft.length > 0 || availableCraft.length > 0) && (
        <div className="mt-6">
          <p className="mb-2 text-xs font-bold text-rpg-muted uppercase">🔨 Métiers</p>
          <div className="grid-2-cards">
            {activeCraft.map((pq: any) => <QuestCard key={pq.id} pq={pq} mode="active" />)}
            {availableCraft.map((q: any) => <QuestCard key={q.id} pq={q} mode="available" />)}
          </div>
        </div>
      )}

      {/* Tâches quotidiennes */}
      <div className="mt-6">
        <p className="mb-2 text-xs font-bold text-rpg-muted uppercase">🔄 Tâches quotidiennes</p>
        <div className="grid-2-cards">
          {activeDaily.map((pq: any) => <QuestCard key={pq.id} pq={pq} mode="active" />)}
          {availableDaily.map((q: any) => <QuestCard key={q.id} pq={q} mode="available" />)}
        </div>
      </div>

      {/* Arcs narratifs */}
      {arcs && arcs.length > 0 && (
        <div className="mt-6">
          <p className="mb-2 text-xs font-bold text-rpg-muted uppercase">📖 Arcs narratifs</p>
          {arcs.map((arc: any) => (
            <ArcSection key={arc.id} arc={arc} defaultOpen={arcDefaultOpen[arc.id] ?? false} />
          ))}
        </div>
      )}
    </div>
  );
}