import { signal } from '@angular/core';
import { TestBed } from '@angular/core/testing';
import { ActivatedRoute, convertToParamMap, Router, provideRouter } from '@angular/router';
import { vi } from 'vitest';
import type { Combat } from '../../../core/api/game-api.models';
import { CombatStore } from '../combat.store';
import { CombatPageComponent } from './combat-page.component';

const activeCombat: Combat = {
  id: 'combat-1',
  status: 'ACTIVE',
  round: 2,
  player: { name: 'Aric Duskwalker', maxHp: 100, currentHp: 95 },
  monster: {
    key: 'ash-rat',
    name: 'Aschenratte',
    level: 1,
    maxHp: 45,
    currentHp: 31,
    artworkPath: '/images/monsters/ash-rat.png',
  },
  events: [
    { round: 1, sequence: 1, type: 'DAMAGE', source: 'PLAYER', target: 'MONSTER', amount: 14 },
    { round: 1, sequence: 2, type: 'DAMAGE', source: 'MONSTER', target: 'PLAYER', amount: 5 },
  ],
  rewards: null,
};

const monsterHitLine = 'Aschenratte trifft Aric Duskwalker für 5 Schaden.';

function countOccurrences(haystack: string | null, needle: string): number {
  return haystack ? haystack.split(needle).length - 1 : 0;
}

describe('CombatPageComponent', () => {
  let combatStore: {
    combat: ReturnType<typeof signal<Combat | null>>;
    loading: ReturnType<typeof signal<boolean>>;
    actionPending: ReturnType<typeof signal<boolean>>;
    error: ReturnType<typeof signal<string | null>>;
    loadCombat: ReturnType<typeof vi.fn>;
    attack: ReturnType<typeof vi.fn>;
  };
  let router: Router;

  async function setup(combat: Combat | null) {
    combatStore = {
      combat: signal(combat),
      loading: signal(false),
      actionPending: signal(false),
      error: signal<string | null>(null),
      loadCombat: vi.fn(() => Promise.resolve()),
      attack: vi.fn(() => Promise.resolve()),
    };

    await TestBed.configureTestingModule({
      imports: [CombatPageComponent],
      providers: [
        provideRouter([]),
        { provide: CombatStore, useValue: combatStore },
        {
          provide: ActivatedRoute,
          useValue: { snapshot: { paramMap: convertToParamMap({ combatId: 'combat-1' }) } },
        },
      ],
    }).compileComponents();

    router = TestBed.inject(Router);
    vi.spyOn(router, 'navigate').mockResolvedValue(true);

    const fixture = TestBed.createComponent(CombatPageComponent);
    fixture.detectChanges();
    // The route load resolves on the microtask queue before the combat renders.
    await fixture.whenStable();
    fixture.detectChanges();
    return fixture;
  }

  afterEach(() => {
    vi.useRealTimers();
  });

  it('loads the combat from the route param on init', async () => {
    await setup(activeCombat);

    expect(combatStore.loadCombat).toHaveBeenCalledWith('combat-1');
  });

  it('shows the player, monster, HP bars, round, and the Angriff action', async () => {
    const fixture = await setup(activeCombat);
    const element = fixture.nativeElement as HTMLElement;

    expect(element.textContent).toContain('Aric Duskwalker');
    expect(element.textContent).toContain('95 / 100');
    expect(element.textContent).toContain('Aschenratte');
    expect(element.textContent).toContain('31 / 45');
    expect(element.querySelector('[data-combat-round]')?.textContent).toContain('Runde 2');
    expect(element.querySelector('[data-combat-attack]')).toBeTruthy();
  });

  it('renders the structured events as readable German combat-log entries', async () => {
    const fixture = await setup(activeCombat);
    const element = fixture.nativeElement as HTMLElement;

    expect(element.textContent).toContain('Aric Duskwalker trifft Aschenratte für 14 Schaden.');
    expect(element.textContent).toContain('Aschenratte trifft Aric Duskwalker für 5 Schaden.');
  });

  it('calls combatStore.attack() when Angriff is clicked', async () => {
    const fixture = await setup(activeCombat);
    const element = fixture.nativeElement as HTMLElement;

    element.querySelector<HTMLButtonElement>('[data-combat-attack]')?.click();

    expect(combatStore.attack).toHaveBeenCalledOnce();
  });

  it('plays the swing, reveals the monster damage, then the recoil a beat later', async () => {
    const fixture = await setup(activeCombat);
    const resolvedRound: Combat = {
      ...activeCombat,
      round: 3,
      player: { ...activeCombat.player, currentHp: 90 },
      monster: { ...activeCombat.monster, currentHp: 17 },
      events: [
        ...activeCombat.events,
        { round: 2, sequence: 3, type: 'DAMAGE', source: 'PLAYER', target: 'MONSTER', amount: 14 },
        { round: 2, sequence: 4, type: 'DAMAGE', source: 'MONSTER', target: 'PLAYER', amount: 5 },
      ],
    };
    combatStore.attack.mockImplementation(async () => {
      combatStore.combat.set(resolvedRound);
    });
    vi.useFakeTimers();

    const element = fixture.nativeElement as HTMLElement;
    const sprite = element.querySelector('.sprite--player');
    element.querySelector<HTMLButtonElement>('[data-combat-attack]')?.click();
    fixture.detectChanges();

    expect(sprite?.classList.contains('sprite--attacking')).toBe(true);
    expect(element.textContent).toContain('31 / 45');
    expect(element.textContent).toContain('95 / 100');

    // Swing lands: the monster loses HP, the player's own loss is held back.
    await vi.advanceTimersByTimeAsync(540);
    fixture.detectChanges();
    expect(sprite?.classList.contains('sprite--attacking')).toBe(false);
    expect(element.textContent).toContain('17 / 45');
    expect(element.textContent).toContain('95 / 100');
    // Only round 1's identical line is logged so far, not round 2's.
    expect(countOccurrences(element.textContent, monsterHitLine)).toBe(1);

    // The monster strikes back after the beat.
    await vi.advanceTimersByTimeAsync(260);
    fixture.detectChanges();
    expect(sprite?.classList.contains('sprite--hit')).toBe(true);
    expect(element.textContent).toContain('90 / 100');
    expect(countOccurrences(element.textContent, monsterHitLine)).toBe(2);

    await vi.advanceTimersByTimeAsync(540);
    fixture.detectChanges();
    expect(sprite?.classList.contains('sprite--hit')).toBe(false);
  });

  it('skips the recoil when the round ends without the monster striking back', async () => {
    const fixture = await setup(activeCombat);
    const won: Combat = {
      ...activeCombat,
      status: 'WON',
      monster: { ...activeCombat.monster, currentHp: 0 },
      events: [
        ...activeCombat.events,
        { round: 2, sequence: 3, type: 'DAMAGE', source: 'PLAYER', target: 'MONSTER', amount: 31 },
        { round: 2, sequence: 4, type: 'COMBAT_WON', source: 'PLAYER', target: 'MONSTER' },
      ],
    };
    combatStore.attack.mockImplementation(async () => {
      combatStore.combat.set(won);
    });
    vi.useFakeTimers();

    const element = fixture.nativeElement as HTMLElement;
    element.querySelector<HTMLButtonElement>('[data-combat-attack]')?.click();
    await vi.advanceTimersByTimeAsync(540);
    fixture.detectChanges();

    expect(element.querySelector('.sprite--player')?.classList.contains('sprite--hit')).toBe(false);
    expect(element.querySelector('[data-combat-result="WON"]')).toBeTruthy();
    expect(element.textContent).toContain('0 / 45');
  });

  it('disables Angriff while an action is pending', async () => {
    const fixture = await setup(activeCombat);
    combatStore.actionPending.set(true);
    fixture.detectChanges();

    const element = fixture.nativeElement as HTMLElement;
    expect(element.querySelector<HTMLButtonElement>('[data-combat-attack]')?.disabled).toBe(true);
  });

  it('shows the victory state and hides Angriff when the combat is WON', async () => {
    const fixture = await setup({ ...activeCombat, status: 'WON' });
    const element = fixture.nativeElement as HTMLElement;

    expect(element.querySelector('[data-combat-result="WON"]')).toBeTruthy();
    expect(element.textContent).toContain('Sieg');
    expect(element.querySelector('[data-combat-attack]')).toBeNull();
  });

  it('shows the defeat state and hides Angriff when the combat is LOST', async () => {
    const fixture = await setup({ ...activeCombat, status: 'LOST' });
    const element = fixture.nativeElement as HTMLElement;

    expect(element.querySelector('[data-combat-result="LOST"]')).toBeTruthy();
    expect(element.textContent).toContain('Niederlage');
    expect(element.querySelector('[data-combat-attack]')).toBeNull();
  });

  it('navigates to /hunt from the victory screen', async () => {
    const fixture = await setup({ ...activeCombat, status: 'WON' });
    const element = fixture.nativeElement as HTMLElement;

    element.querySelector<HTMLButtonElement>('[data-combat-to-hunt]')?.click();

    expect(router.navigate).toHaveBeenCalledWith(['/hunt']);
  });

  it('shows an error and retries loading the combat', async () => {
    const fixture = await setup(null);
    combatStore.error.set('Dieser Kampf wurde nicht gefunden.');
    fixture.detectChanges();

    const element = fixture.nativeElement as HTMLElement;
    expect(element.querySelector('[role="alert"]')?.textContent).toContain(
      'Dieser Kampf wurde nicht gefunden.',
    );
    element.querySelector<HTMLButtonElement>('[data-combat-retry]')?.click();

    expect(combatStore.loadCombat).toHaveBeenCalledTimes(2);
  });
});