import { TestBed } from '@angular/core/testing';
import { vi } from 'vitest';
import type { InventoryItem } from '../../core/api/game-api.models';
import { InventoryDetailPanelComponent } from './inventory-detail-panel.component';

const wornSword: InventoryItem = {
  id: 'item-sword',
  quantity: 1,
  equipped: true,
  item: {
    key: 'worn-short-sword',
    name: 'Worn Shortsword',
    description: 'Item description.',
    rarity: 'COMMON',
    equipmentSlot: 'WEAPON',
    weaponDamage: 8,
    bonusAttack: 0,
    bonusHp: 0,
    bonusArmor: 0,
    iconPath: '/images/items/worn-short-sword.png',
  },
};

const banditBlade: InventoryItem = {
  id: 'item-blade',
  quantity: 1,
  equipped: false,
  item: {
    key: 'bandit-blade',
    name: 'Bandit Blade',
    description: 'Item description.',
    rarity: 'COMMON',
    equipmentSlot: 'WEAPON',
    weaponDamage: 11,
    bonusAttack: 1,
    bonusHp: 0,
    bonusArmor: 0,
    iconPath: '/images/items/bandit-blade.png',
  },
};

const ashPelt: InventoryItem = {
  id: 'item-pelt',
  quantity: 3,
  equipped: false,
  item: {
    key: 'ash-pelt',
    name: 'Ash Pelt',
    description: 'Item description.',
    rarity: 'COMMON',
    equipmentSlot: null,
    weaponDamage: 0,
    bonusAttack: 0,
    bonusHp: 0,
    bonusArmor: 0,
    iconPath: '/images/items/ash-pelt.png',
  },
};

async function setup(overrides: {
  item?: InventoryItem | null;
  equippedItemInSlot?: InventoryItem | null;
  busy?: boolean;
}) {
  TestBed.resetTestingModule();
  await TestBed.configureTestingModule({ imports: [InventoryDetailPanelComponent] }).compileComponents();
  const fixture = TestBed.createComponent(InventoryDetailPanelComponent);
  fixture.componentRef.setInput('item', overrides.item ?? null);
  fixture.componentRef.setInput('equippedItemInSlot', overrides.equippedItemInSlot ?? null);
  fixture.componentRef.setInput('busy', overrides.busy ?? false);
  fixture.detectChanges();
  return fixture;
}

describe('InventoryDetailPanelComponent', () => {
  it('shows a placeholder when nothing is selected', async () => {
    const fixture = await setup({ item: null });
    expect((fixture.nativeElement as HTMLElement).querySelector('[data-detail-empty]')).not.toBeNull();
  });

  it('shows Equipped for the currently equipped item, with no equip button', async () => {
    const fixture = await setup({ item: wornSword });
    const element = fixture.nativeElement as HTMLElement;

    expect(element.querySelector('[data-detail-equipped]')?.textContent).toContain('Equipped');
    expect(element.querySelector('[data-detail-equip]')).toBeNull();
  });

  it('refuses to offer an equip button for a non-equippable item', async () => {
    const fixture = await setup({ item: ashPelt });
    const element = fixture.nativeElement as HTMLElement;

    expect(element.textContent).toContain('Not equippable');
    expect(element.querySelector('[data-detail-equip]')).toBeNull();
    expect(element.querySelector('[data-detail-equipped]')).toBeNull();
  });

  it('shows the item flavour text from the server', async () => {
    const fixture = await setup({
      item: {
        ...banditBlade,
        item: { ...banditBlade.item, description: 'A roughly serrated blade, forged for quick raids.' },
      },
    });

    expect((fixture.nativeElement as HTMLElement).textContent).toContain(
      'A roughly serrated blade, forged for quick raids.',
    );
  });

  it('shows the stat comparison against the equipped item in the same slot', async () => {
    const fixture = await setup({ item: banditBlade, equippedItemInSlot: wornSword });
    const text = (fixture.nativeElement as HTMLElement).querySelector('[data-detail-stats]')?.textContent ?? '';

    expect(text).toContain('11');
    expect(text).toContain('+3');
    expect(text).toContain('+1');
  });

  it('always shows the plain equip button for an owned equippable item', async () => {
    const fixture = await setup({ item: banditBlade });
    const element = fixture.nativeElement as HTMLElement;

    const button = element.querySelector<HTMLButtonElement>('[data-detail-equip]');
    expect(button?.disabled).toBe(false);
    expect(button?.textContent?.trim()).toBe('Equip');
  });

  it('emits equip with the characterItemId when Equip is clicked', async () => {
    const fixture = await setup({ item: banditBlade });
    const emitted: string[] = [];
    fixture.componentInstance.equip.subscribe((id: string) => emitted.push(id));

    (fixture.nativeElement as HTMLElement).querySelector<HTMLButtonElement>('[data-detail-equip]')?.click();

    expect(emitted).toEqual(['item-blade']);
  });

  it('disables the equip button while busy', async () => {
    const fixture = await setup({ item: banditBlade, busy: true });
    const button = (fixture.nativeElement as HTMLElement).querySelector<HTMLButtonElement>('[data-detail-equip]');

    expect(button?.disabled).toBe(true);
  });
});