import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { itemApi, materialApi } from '../api/endpoints';
import { api } from '../api/client';
import type { CharacterItem } from '../api/types';
import { Package, Sword, Shield, Coins } from 'lucide-react';

const RARITY_LABEL: Record<string, string> = {
  common: 'Commun', rare: 'Rare', epic: 'Épique', legendary: 'Légendaire',
};

function ItemCard({ ci, onEquip, onUnequip, onSell, selling }: {
  ci: CharacterItem; onEquip: () => void; onUnequip: () => void; onSell: () => void; selling: boolean;
}) {
  const { item } = ci;
  const forgeBonusATK = item.type === 'weapon' ? ci.forgeLevel * 2 : 0;
  const forgeBonusDEF = item.type === 'armor' ? ci.forgeLevel * 2 : 0;
  const totalATK = item.attackBonus + forgeBonusATK;
  const totalDEF = item.defenseBonus + forgeBonusDEF;
  const FORGE_COSTS: Record<number, number> = { 1: 50, 2: 100, 3: 250, 4: 500, 5: 1000 };
  let forgeInvestment = 0;
  for (let i = 1; i <= ci.forgeLevel; i++) forgeInvestment += FORGE_COSTS[i] ?? 0;
  const sellPrice = Math.floor(((item as any).buyPrice || 0) * 0.4 + forgeInvestment * 0.5);

  const bonuses = [
    totalATK > 0 && `+${totalATK} ATK${forgeBonusATK > 0 ? ` (${item.attackBonus}+${forgeBonusATK})` : ''}`,
    totalDEF > 0 && `+${totalDEF} DEF${forgeBonusDEF > 0 ? ` (${item.defenseBonus}+${forgeBonusDEF})` : ''}`,
    item.forceBonus    && `+${item.forceBonus} FOR`,
    item.agiliteBonus  && `+${item.agiliteBonus} AGI`,
    item.intelligenceBonus && `+${item.intelligenceBonus} INT`,
    item.chanceBonus   && `+${item.chanceBonus} CHA`,
    item.vitaliteBonus && `+${item.vitaliteBonus} VIT`,
  ].filter(Boolean).join(' · ');

  return (
    <div className={`card ${ci.equipped ? 'card-gold' : ''}`} style={{ position: 'relative' }}>
      {ci.equipped && (
        <span className="badge badge-gold" style={{ position: 'absolute', top: 8, right: 8, fontSize: 9 }}>Équipé</span>
      )}
      {ci.forgeLevel > 0 && (
        <span className="badge badge-blue" style={{ position: 'absolute', top: ci.equipped ? 28 : 8, right: 8, fontSize: 9 }}>
          +{ci.forgeLevel}
        </span>
      )}
      <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginBottom: 4 }}>
        <span style={{ fontSize: 20 }}>{item.type === 'weapon' ? '⚔️' : '🛡️'}</span>
        <div>
          <div style={{ fontWeight: 700, fontSize: 13 }}>{item.name}</div>
          <div className={`rarity-${item.rarity}`} style={{ fontSize: 11 }}>{RARITY_LABEL[item.rarity]}</div>
        </div>
      </div>
      {bonuses && <div style={{ fontSize: 11, color: '#3ddc84', marginBottom: 8 }}>{bonuses}</div>}
      <div style={{ display: 'flex', gap: 6, alignItems: 'center' }}>
        {!ci.equipped
          ? <button className="btn btn-ghost" style={{ fontSize: 11, padding: '0.2rem 0.6rem' }} onClick={onEquip}>Équiper</button>
          : <button className="btn btn-ghost" style={{ fontSize: 11, padding: '0.2rem 0.6rem' }} onClick={onUnequip}>Déséquiper</button>
        }
        {!ci.equipped && sellPrice > 0 && (
          <button className="btn btn-ghost" style={{ fontSize: 10, padding: '0.15rem 0.5rem', color: '#6b7a99' }}
            disabled={selling} onClick={onSell}>
            <Coins size={10} style={{ display: 'inline', marginRight: 3 }} />{selling ? '...' : `Vendre (${sellPrice}💰)`}
          </button>
        )}
      </div>
    </div>
  );
}

export function InventoryPage() {
  const qc = useQueryClient();

  const { data: inventory, isLoading: loadInv } = useQuery({
    queryKey: ['inventory'],
    queryFn: itemApi.inventory,
  });

  const { data: materials, isLoading: loadMat } = useQuery({
    queryKey: ['materials'],
    queryFn: materialApi.inventory,
  });

  const equipMut = useMutation({
    mutationFn: (id: string) => itemApi.equip(id),
    onSuccess: () => qc.invalidateQueries({ queryKey: ['inventory'] }),
  });

  const unequipMut = useMutation({
    mutationFn: (slot: 'weapon' | 'armor') => itemApi.unequip(slot),
    onSuccess: () => qc.invalidateQueries({ queryKey: ['inventory'] }),
  });

  const sellMut = useMutation({
    mutationFn: (charItemId: string) => api.post<any>(`/shop/sell/${charItemId}`),
    onSuccess: () => {
      qc.invalidateQueries({ queryKey: ['inventory'] });
      qc.invalidateQueries({ queryKey: ['character'] });
    },
  });

  if (loadInv || loadMat) return <div style={{ padding: '2rem', color: '#6b7a99' }}>Chargement…</div>;

  const weapons = inventory?.filter(ci => ci.item.type === 'weapon') ?? [];
  const armors  = inventory?.filter(ci => ci.item.type === 'armor')  ?? [];

  return (
    <div>
      <h2 style={{ margin: '0 0 1rem', color: '#f4c94e', fontSize: 20 }}>
        <Package size={18} style={{ display: 'inline', marginRight: 8 }} />Inventaire
      </h2>

      {inventory?.length === 0 && (
        <div className="card" style={{ textAlign: 'center', padding: '2rem', color: '#6b7a99' }}>
          Inventaire vide — gagne des combats pour lootter des matériaux et crafter des équipements !
        </div>
      )}

      {/* Armes */}
      {weapons.length > 0 && (
        <div style={{ marginBottom: '1.25rem' }}>
          <p style={{ margin: '0 0 0.5rem', fontSize: 12, fontWeight: 700, color: '#6b7a99', textTransform: 'uppercase', display:'flex', alignItems:'center', gap:4 }}>
            <Sword size={11} /> Armes ({weapons.length})
          </p>
          <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fill, minmax(220px, 1fr))', gap: '0.75rem' }}>
            {weapons.map(ci => (
              <ItemCard
                key={ci.id} ci={ci}
                onEquip={() => equipMut.mutate(ci.id)}
                onUnequip={() => unequipMut.mutate('weapon')}
                onSell={() => sellMut.mutate(ci.id)}
                selling={sellMut.isPending}
              />
            ))}
          </div>
        </div>
      )}

      {/* Armures */}
      {armors.length > 0 && (
        <div style={{ marginBottom: '1.25rem' }}>
          <p style={{ margin: '0 0 0.5rem', fontSize: 12, fontWeight: 700, color: '#6b7a99', textTransform: 'uppercase', display:'flex', alignItems:'center', gap:4 }}>
            <Shield size={11} /> Armures ({armors.length})
          </p>
          <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fill, minmax(220px, 1fr))', gap: '0.75rem' }}>
            {armors.map(ci => (
              <ItemCard
                key={ci.id} ci={ci}
                onEquip={() => equipMut.mutate(ci.id)}
                onUnequip={() => unequipMut.mutate('armor')}
                onSell={() => sellMut.mutate(ci.id)}
                selling={sellMut.isPending}
              />
            ))}
          </div>
        </div>
      )}

      {/* Matériaux */}
      {materials && materials.length > 0 && (
        <div>
          <p style={{ margin: '0 0 0.5rem', fontSize: 12, fontWeight: 700, color: '#6b7a99', textTransform: 'uppercase' }}>
            🌿 Matériaux
          </p>
          <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fill, minmax(180px, 1fr))', gap: '0.5rem' }}>
            {materials.map(cm => (
              <div key={cm.id} className="card" style={{ display: 'flex', alignItems: 'center', gap: 8, padding: '0.625rem' }}>
                <span style={{ fontSize: 18 }}>🌿</span>
                <div>
                  <div style={{ fontSize: 13, fontWeight: 600 }}>{cm.material.name}</div>
                  <div className={`rarity-${cm.material.rarity}`} style={{ fontSize: 11 }}>×{cm.quantity}</div>
                </div>
              </div>
            ))}
          </div>
        </div>
      )}
    </div>
  );
}
