import { signal } from '@angular/core';
import { TestBed } from '@angular/core/testing';
import { By } from '@angular/platform-browser';
import { vi } from 'vitest';
import type { CharacterResponse, EquipmentResponse, InventoryItem, InventoryResponse } from '../../core/api/game-api.models';
import { WorldStore } from '../world/world.store';
import { InventoryDetailPanelComponent } from './inventory-detail-panel.component';
import { InventoryPageComponent } from './inventory-page.component';
import { InventoryStore } from './inventory.store';

const inventory: InventoryResponse = {
  items: [
    {
      id: 'item-sword',
      quantity: 1,
      equipped: true,
      item: {
        key: 'worn-short-sword',
        name: 'Abgenutztes Kurzschwert',
        rarity: 'COMMON',
        equipmentSlot: 'WEAPON',
        weaponDamage: 8,
        bonusAttack: 0,
        bonusHp: 0,
        bonusArmor: 0,
        iconPath: '/images/items/worn-short-sword.png',
      },
    },
    {
      id: 'item-blade',
      quantity: 1,
      equipped: false,
      item: {
        key: 'bandit-blade',
        name: 'Räuberklinge',
        rarity: 'COMMON',
        equipmentSlot: 'WEAPON',
        weaponDamage: 11,
        bonusAttack: 1,
        bonusHp: 0,
        bonusArmor: 0,
        iconPath: '/images/items/bandit-blade.png',
      },
    },
  ],
};

const equipment: EquipmentResponse = {
  slots: {
    WEAPON: { characterItemId: 'item-sword', item: { key: 'worn-short-sword', name: 'Abgenutztes Kurzschwert', rarity: 'COMMON', iconPath: '/images/items/worn-short-sword.png' } },
    HEAD: null,
    CHEST: null,
    HANDS: null,
    LEGS: null,
    FEET: null,
    AMULET: null,
  },
  stats: { maxHp: 100, attack: 6, weaponDamage: 8, armor: 0 },
};

const character: CharacterResponse = {
  id: 'character-1',
  name: 'Aric Duskwalker',
  renown: 0,
  silver: 0,
  currentHp: 100,
  maxHp: 100,
  attack: 6,
  currentLocation: { id: 'loc-1', key: 'south-gate', name: 'Südtor' },
};

interface SetupOptions {
  inventoryData?: InventoryResponse;
  selectedItemId?: string | null;
  selectedItem?: InventoryItem | null;
  character?: CharacterResponse | null;
}

async function setup(options: SetupOptions = {}) {
  const inventoryStore = {
    inventory: signal(options.inventoryData ?? inventory),
    equipment: signal(equipment),
    selectedItemId: signal<string | null>(options.selectedItemId ?? null),
    loading: signal(false),
    equipping: signal(false),
    error: signal<string | null>(null),
    load: vi.fn(() => Promise.resolve()),
    selectItem: vi.fn(),
    selectedItem: vi.fn(() => options.selectedItem ?? null),
    equip: vi.fn(() => Promise.resolve()),
  };
  const worldStore = {
    character: signal(options.character === undefined ? character : options.character),
    load: vi.fn(() => Promise.resolve()),
  };

  await TestBed.configureTestingModule({
    imports: [InventoryPageComponent],
    providers: [
      { provide: InventoryStore, useValue: inventoryStore },
      { provide: WorldStore, useValue: worldStore },
    ],
  }).compileComponents();

  const fixture = TestBed.createComponent(InventoryPageComponent);
  fixture.detectChanges();
  return { fixture, inventoryStore, worldStore };
}

describe('InventoryPageComponent', () => {
  it('loads the inventory on init', async () => {
    const { inventoryStore } = await setup();
    expect(inventoryStore.load).toHaveBeenCalledOnce();
  });

  it('loads the world state on init when no character has been loaded yet (direct navigation/hard refresh)', async () => {
    const { worldStore } = await setup({ character: null });
    expect(worldStore.load).toHaveBeenCalledOnce();
  });

  it('does not call world load again when a character is already present', async () => {
    const { worldStore } = await setup();
    expect(worldStore.load).not.toHaveBeenCalled();
  });

  it('renders one tile per owned item', async () => {
    const { fixture } = await setup();
    const tiles = (fixture.nativeElement as HTMLElement).querySelectorAll('.inventory-page__slot');
    expect(tiles.length).toBe(2);
  });

  it('marks the equipped item with a badge', async () => {
    const { fixture } = await setup();
    expect((fixture.nativeElement as HTMLElement).querySelector('[data-slot-equipped]')).not.toBeNull();
  });

  it('selects an item when its tile is clicked', async () => {
    const { fixture, inventoryStore } = await setup();
    (fixture.nativeElement as HTMLElement).querySelectorAll<HTMLButtonElement>('.inventory-page__slot')[1].click();

    expect(inventoryStore.selectItem).toHaveBeenCalledWith('item-blade');
  });

  it('shows the equipment overview with all seven slots and empty ones as Leer', async () => {
    const { fixture } = await setup();
    const text = (fixture.nativeElement as HTMLElement).querySelector('.inventory-page__equipment-list')?.textContent ?? '';

    expect(text).toContain('Waffe');
    expect(text).toContain('Abgenutztes Kurzschwert');
    expect(text).toContain('Kopf');
    expect(text).toContain('Leer');
  });

  it('shows the effective stats summary from the equipment response', async () => {
    const { fixture } = await setup();
    const text = (fixture.nativeElement as HTMLElement).querySelector('[data-inventory-stats]')?.textContent ?? '';

    expect(text).toContain('100');
    expect(text).toContain('6');
    expect(text).toContain('8');
  });

  it('passes the equipped item from the SAME slot as the selection — not just any equipped item — to the detail panel', async () => {
    // item-helm (HEAD, equipped) is placed before item-sword (WEAPON, equipped) so that a
    // regression which drops the equipmentSlot match (i.e. "find the first equipped item")
    // would surface item-helm instead of item-sword, and this test would fail.
    const threeItemInventory: InventoryResponse = {
      items: [
        {
          id: 'item-helm',
          quantity: 1,
          equipped: true,
          item: {
            key: 'iron-helm',
            name: 'Eiserner Helm',
            rarity: 'COMMON',
            equipmentSlot: 'HEAD',
            weaponDamage: 0,
            bonusAttack: 0,
            bonusHp: 5,
            bonusArmor: 2,
            iconPath: '/images/items/iron-helm.png',
          },
        },
        inventory.items[0], // item-sword, WEAPON, equipped
        inventory.items[1], // item-blade, WEAPON, not equipped — this is the selection
      ],
    };

    const { fixture } = await setup({
      inventoryData: threeItemInventory,
      selectedItemId: 'item-blade',
      selectedItem: threeItemInventory.items[2],
    });

    const panel = fixture.debugElement.query(By.directive(InventoryDetailPanelComponent))
      .componentInstance as InventoryDetailPanelComponent;

    expect(panel.equippedItemInSlot()?.id).toBe('item-sword');
  });
});