import { describe, it, expect, vi, beforeEach } from 'vitest';
import AppState from '../utils/renderer/AppState';

describe('AppState', () => {
  let state;

  beforeEach(() => {
    state = new AppState();
  });

  describe('constructor', () => {
    it('initializes with default values', () => {
      expect(state.getCurrentDirectory()).toBeNull();
      expect(state.getCurrentFiles()).toEqual([]);
      expect(state.getCurrentShow()).toBeNull();
      expect(state.getCurrentSeasons()).toEqual([]);
      expect(state.getCurrentEpisodes()).toEqual([]);
      expect(state.getSelectedSeasonEpisodeCount()).toBe(0);
      expect(state.isUpdatingEpisodeNumbers).toBe(false);
      expect(state.getNavigationStack()).toEqual([]);
      expect(state.getNavigationDepth()).toBe(0);
    });
  });

  describe('currentDirectory', () => {
    it('sets and gets directory', () => {
      state.setCurrentDirectory('/path/to/dir');
      expect(state.getCurrentDirectory()).toBe('/path/to/dir');
    });

    it('overwrites previous directory', () => {
      state.setCurrentDirectory('/path/one');
      state.setCurrentDirectory('/path/two');
      expect(state.getCurrentDirectory()).toBe('/path/two');
    });
  });

  describe('currentFiles', () => {
    it('sets and gets files array', () => {
      const files = [{ name: 'file1.mp4' }, { name: 'file2.mp4' }];
      state.setCurrentFiles(files);
      expect(state.getCurrentFiles()).toEqual(files);
    });

    it('handles empty array', () => {
      state.setCurrentFiles([]);
      expect(state.getCurrentFiles()).toEqual([]);
    });
  });

  describe('currentShow', () => {
    it('sets and gets show object', () => {
      const show = { id: 'series-12345', name: 'Test Show' };
      state.setCurrentShow(show);
      expect(state.getCurrentShow()).toEqual(show);
    });
  });

  describe('currentSeasons', () => {
    it('sets and gets seasons array', () => {
      const seasons = [{ number: 1 }, { number: 2 }];
      state.setCurrentSeasons(seasons);
      expect(state.getCurrentSeasons()).toEqual(seasons);
    });
  });

  describe('currentEpisodes', () => {
    it('sets and gets episodes array', () => {
      const episodes = [{ number: 1 }, { number: 2 }];
      state.setCurrentEpisodes(episodes);
      expect(state.getCurrentEpisodes()).toEqual(episodes);
    });
  });

  describe('selectedSeasonEpisodeCount', () => {
    it('sets and gets episode count', () => {
      state.setSelectedSeasonEpisodeCount(13);
      expect(state.getSelectedSeasonEpisodeCount()).toBe(13);
    });
  });

  describe('updatingEpisodeNumbers', () => {
    it('sets and gets updating flag', () => {
      state.setUpdatingEpisodeNumbers(true);
      expect(state.isUpdatingEpisodeNumbers).toBe(true);
      state.setUpdatingEpisodeNumbers(false);
      expect(state.isUpdatingEpisodeNumbers).toBe(false);
    });
  });

  describe('reset', () => {
    it('resets all state to defaults', () => {
      state.setCurrentDirectory('/path/to/dir');
      state.setCurrentFiles([{ name: 'file.mp4' }]);
      state.setCurrentShow({ name: 'Show' });
      state.setCurrentSeasons([{ number: 1 }]);
      state.setCurrentEpisodes([{ number: 1 }]);
      state.setSelectedSeasonEpisodeCount(10);
      state.setUpdatingEpisodeNumbers(true);
      state.addToNavigationStack('/path/to/dir');

      state.reset();

      expect(state.getCurrentDirectory()).toBeNull();
      expect(state.getCurrentFiles()).toEqual([]);
      expect(state.getCurrentShow()).toBeNull();
      expect(state.getCurrentSeasons()).toEqual([]);
      expect(state.getCurrentEpisodes()).toEqual([]);
      expect(state.getSelectedSeasonEpisodeCount()).toBe(0);
      expect(state.isUpdatingEpisodeNumbers).toBe(false);
      expect(state.getNavigationStack()).toEqual([]);
      expect(state.getNavigationDepth()).toBe(0);
    });
  });

  describe('navigationStack', () => {
    it('adds directories to stack', () => {
      state.addToNavigationStack('/home');
      expect(state.getNavigationStack()).toEqual(['/home']);
      expect(state.getNavigationDepth()).toBe(0);
    });

    it('supports multiple navigation levels', () => {
      state.addToNavigationStack('/home');
      state.addToNavigationStack('/home/movies');
      state.addToNavigationStack('/home/movies/show');
      expect(state.getNavigationStack().length).toBe(3);
      expect(state.getNavigationDepth()).toBe(2);
    });

    it('returns current directory from stack', () => {
      state.addToNavigationStack('/home');
      state.addToNavigationStack('/home/movies');
      expect(state.getCurrentDirectoryFromStack()).toBe('/home/movies');
    });

    it('returns null when stack is empty', () => {
      expect(state.getCurrentDirectoryFromStack()).toBeNull();
    });

    it('truncates forward history on new navigation', () => {
      state.addToNavigationStack('/home');
      state.addToNavigationStack('/home/movies');
      state.goBack();
      state.addToNavigationStack('/home/photos');
      expect(state.getNavigationStack()).toEqual(['/home', '/home/photos']);
    });

    it('goes back to previous directory', () => {
      state.addToNavigationStack('/home');
      state.addToNavigationStack('/home/movies');
      const result = state.goBack();
      expect(result).toBe('/home');
    });

    it('returns null when cannot go back', () => {
      state.addToNavigationStack('/home');
      const result = state.goBack();
      expect(result).toBeNull();
    });

    it('returns null on empty stack goBack', () => {
      const result = state.goBack();
      expect(result).toBeNull();
    });

    it('canGoBack returns correct state', () => {
      expect(state.canGoBack()).toBe(false);
      state.addToNavigationStack('/home');
      expect(state.canGoBack()).toBe(false);
      state.addToNavigationStack('/home/movies');
      expect(state.canGoBack()).toBe(true);
    });

    it('canGoBack becomes false after going back to root', () => {
      state.addToNavigationStack('/home');
      state.addToNavigationStack('/home/movies');
      state.goBack();
      expect(state.canGoBack()).toBe(false);
    });

    it('handles deep navigation', () => {
      for (let i = 1; i <= 5; i++) {
        state.addToNavigationStack(`/level${i}`);
      }
      expect(state.getNavigationDepth()).toBe(4);
      expect(state.getNavigationStack().length).toBe(5);
    });
  });
});