import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { useNavigate } from 'react-router-dom';
import toast from 'react-hot-toast';
import { npcApi, characterApi } from '../api/endpoints';
import type { NpcView } from '../api/types';
import { Landmark, Heart, Zap, ArrowRight } from 'lucide-react';
import { REST_COST } from '../constants';

// ── Constants ──

const ROLE_EMOJI: Record<string, string> = {
  mentor: '🧙',
  companion: '💚',
  merchant: '🛍️',
  quest_giver: '📜',
  sage: '🔮',
  rival: '⚔️',
};

const ROLE_LABELS: Record<string, string> = {
  mentor: 'Mentor',
  companion: 'Compagnon',
  merchant: 'Marchand',
  quest_giver: 'Quêtes',
  sage: 'Sage',
  rival: 'Rival',
};

const ROLE_COLORS: Record<string, string> = {
  mentor: '#f4c94e',
  companion: '#3ddc84',
  merchant: '#5ba4f5',
  quest_giver: '#a78bfa',
  sage: '#a78bfa',
  rival: '#e84040',
};

const ACTION_LABELS: Record<string, { label: string; emoji: string }> = {
  heal: { label: 'Soins', emoji: '🩹' },
  open_quests: { label: 'Voir les quêtes', emoji: '📜' },
  open_shop: { label: 'Voir la boutique', emoji: '🛍️' },
  open_forge: { label: 'Voir la forge', emoji: '🔨' },
  challenge: { label: 'Défier', emoji: '⚔️' },
};

const ACTION_ROUTES: Record<string, string> = {
  open_quests: '/quests',
  open_shop: '/shop',
  open_forge: '/forge',
  challenge: '/combat',
};

const VILLAGE_LOCATIONS: Record<string, { name: string; emoji: string; atmosphere: string }> = {
  village_plaza: {
    name: 'Place du Village',
    emoji: '🌸',
    atmosphere: 'Les nénuphars flottent doucement sous la lumière filtrée. Un air familier résonne.',
  },
  village_arena: {
    name: 'Arène',
    emoji: '🏟️',
    atmosphere: 'L\'écho des combats passés résonne sur les pierres mouillées.',
  },
  village_quests: {
    name: 'Source aux Quêtes',
    emoji: '📜',
    atmosphere: 'Le murmure du savoir coule comme un ruisseau entre les rochers moussus.',
  },
  village_forge: {
    name: 'La Forge',
    emoji: '🔨',
    atmosphere: 'Des étincelles dansent et le métal chante sous les coups du marteau.',
  },
  village_shop: {
    name: 'L\'Échoppe',
    emoji: '🏪',
    atmosphere: 'Des marchandises exotiques s\'étalent sur des feuilles de nénuphar géantes.',
  },
};

const LOCATION_ORDER = ['village_plaza', 'village_arena', 'village_quests', 'village_forge', 'village_shop'];

// ── Components ──

function NpcCard({ npc, character }: { npc: NpcView; character: any }) {
  const navigate = useNavigate();
  const qc = useQueryClient();
  const roleColor = ROLE_COLORS[npc.role] ?? '#6b7a99';
  const roleEmoji = ROLE_EMOJI[npc.role] ?? '🐸';
  const roleLabel = ROLE_LABELS[npc.role] ?? npc.role;

  const healMut = useMutation({
    mutationFn: () => characterApi.rest(),
    onSuccess: (data) => {
      toast.success(`${npc.name} vous soigne ! +${data.healed} PV`);
      qc.invalidateQueries({ queryKey: ['character'] });
    },
    onError: (err: Error) => toast.error(err.message),
  });

  const endurance = character?.enduranceCurrent ?? 0;
  const needsHeal = character && character.hpCurrent < character.hpMax;
  const canHeal = needsHeal && endurance >= REST_COST;

  const handleAction = () => {
    if (!npc.action) return;
    if (npc.action === 'heal') {
      healMut.mutate();
      return;
    }
    const route = ACTION_ROUTES[npc.action];
    if (route) navigate(route);
  };

  const actionInfo = npc.action ? ACTION_LABELS[npc.action] : null;

  return (
    <div className="card flex-1 min-w-[280px] py-4 px-5">
      {/* Header */}
      <div className="flex items-start gap-3 mb-3">
        <span className="text-[32px] leading-none">{roleEmoji}</span>
        <div className="flex-1 min-w-0">
          <div className="flex items-center gap-2">
            <span className="font-bold text-sm text-rpg-text">{npc.name}</span>
            <span
              className="text-[9px] font-bold px-1.5 py-px rounded uppercase"
              style={{ background: roleColor + '22', color: roleColor }}
            >
              {roleLabel}
            </span>
          </div>
          {npc.lore && (
            <p className="mt-1 mb-0 text-[11px] text-rpg-muted italic line-clamp-2">{npc.lore}</p>
          )}
        </div>
      </div>

      {/* Dialogue bubble */}
      <div
        className="rounded-md px-3 py-2.5 mb-3 text-xs text-rpg-text leading-relaxed"
        style={{
          background: '#111620',
          borderLeft: `3px solid ${roleColor}`,
        }}
      >
        « {npc.dialogue} »
      </div>

      {/* Action */}
      {actionInfo && (
        <div>
          {npc.action === 'heal' ? (
            <div>
              <button
                className={`btn ${canHeal ? 'btn-gold' : 'btn-ghost'} w-full text-xs py-1.5 flex items-center justify-center gap-2`}
                disabled={!canHeal || healMut.isPending}
                onClick={handleAction}
              >
                {healMut.isPending ? (
                  'Soins en cours…'
                ) : (
                  <>
                    <Heart size={12} />
                    {actionInfo.label}
                    <span className="text-[10px] opacity-70 flex items-center gap-0.5">
                      ({REST_COST} <Zap size={9} />)
                    </span>
                  </>
                )}
              </button>
              {!needsHeal && (
                <p className="text-[10px] text-rpg-green text-center mt-1.5">Vos PV sont au maximum !</p>
              )}
              {needsHeal && !canHeal && (
                <p className="text-[10px] text-rpg-red text-center mt-1.5">Endurance insuffisante</p>
              )}
            </div>
          ) : (
            <button
              className="btn btn-ghost w-full text-xs py-1.5 flex items-center justify-center gap-2"
              onClick={handleAction}
            >
              {actionInfo.emoji} {actionInfo.label}
              <ArrowRight size={12} className="opacity-50" />
            </button>
          )}
        </div>
      )}
    </div>
  );
}

function VillageLocation({ locationKey, npcs, character }: {
  locationKey: string;
  npcs: NpcView[];
  character: any;
}) {
  const loc = VILLAGE_LOCATIONS[locationKey];
  if (!loc || npcs.length === 0) return null;

  return (
    <div className="mb-6">
      {/* Location header */}
      <div className="mb-3">
        <h3 className="text-sm font-bold text-rpg-text flex items-center gap-2 mb-1">
          <span className="text-base">{loc.emoji}</span>
          {loc.name}
        </h3>
        <p className="text-[11px] text-rpg-muted italic pl-7">{loc.atmosphere}</p>
      </div>

      {/* NPC cards */}
      <div className="flex gap-3 flex-wrap">
        {npcs.map((npc) => (
          <NpcCard key={npc.id} npc={npc} character={character} />
        ))}
      </div>
    </div>
  );
}

export function VillagePage() {
  const { data: npcs, isLoading } = useQuery({
    queryKey: ['npcs'],
    queryFn: npcApi.all,
  });

  const { data: character } = useQuery({
    queryKey: ['character'],
    queryFn: characterApi.me,
  });

  if (isLoading) return <div className="p-8 text-rpg-muted">Chargement du village…</div>;

  // Group NPCs by location
  const byLocation = new Map<string, NpcView[]>();
  for (const npc of (npcs ?? [])) {
    const list = byLocation.get(npc.location) ?? [];
    list.push(npc);
    byLocation.set(npc.location, list);
  }

  return (
    <div>
      {/* Village banner */}
      <div className="card card-gold mb-6 py-4 px-5">
        <div className="flex items-center gap-3 mb-2">
          <Landmark size={20} className="text-rpg-gold" />
          <h2 className="text-lg font-bold text-rpg-gold m-0">Le Village</h2>
        </div>
        <p className="text-xs text-rpg-muted m-0">
          L'étang murmure doucement. Les grenouilles vaquent à leurs occupations.
          Un lieu de repos, de rencontres et de préparation avant la prochaine aventure.
        </p>
      </div>

      {/* Location sections */}
      {LOCATION_ORDER.map((locKey) => (
        <VillageLocation
          key={locKey}
          locationKey={locKey}
          npcs={byLocation.get(locKey) ?? []}
          character={character}
        />
      ))}

      {/* Empty state */}
      {(!npcs || npcs.length === 0) && (
        <div className="card py-8 text-center text-rpg-muted text-sm">
          Le village semble désert… Revenez plus tard.
        </div>
      )}
    </div>
  );
}