import AutoStatusPlugin from '../src/main';
import { App, TFile, Notice } from './mock_obsidian';
import { FILE_PROCESSING_SCENARIOS } from './test-scenarios';
import {
  NOTES_WITH_PENDING_TASKS,
  NOTES_WITH_ALL_COMPLETED_TASKS,
  NOTES_WITH_NO_TASKS,
  NOTE_WITH_PENDING_TASKS_PROPERTY,
  NOTES_WITH_NESTED_TASKS,
} from './sample-notes';

// Mock Notice constructor
jest.mock('obsidian', () => {
  const originalModule = jest.requireActual('./mock_obsidian');
  return {
    ...originalModule,
    Notice: jest.fn().mockImplementation((message: string) => ({
      hide: jest.fn(),
    })),
  };
});

describe('File Processing Logic', () => {
  let plugin: AutoStatusPlugin;
  let mockApp: App;

  beforeEach(() => {
    mockApp = new App();
    plugin = new AutoStatusPlugin(mockApp as any, {} as any);
    plugin.settings = {
      propertyName: 'Pending tasks',
      enableAutoProcessing: true,
      excludeFolders: [],
      includeFolders: [],
      debounceDelay: 500,
      enableTaskCounts: false,
      pendingTasksCountProperty: 'Pending tasks count',
      totalTasksCountProperty: 'Total tasks count',
      countRootTasksOnly: false,
    };

    // Reset all mocks
    jest.clearAllMocks();
  });

  describe('shouldProcessFile', () => {
    test('should process markdown files', () => {
      const file = new TFile('test.md');
      expect(plugin.shouldProcessFile(file)).toBe(true);
    });

    test('should not process non-markdown files', () => {
      const txtFile = new TFile('test.txt');
      const pdfFile = new TFile('document.pdf');
      const imgFile = new TFile('image.png');

      expect(plugin.shouldProcessFile(txtFile)).toBe(false);
      expect(plugin.shouldProcessFile(pdfFile)).toBe(false);
      expect(plugin.shouldProcessFile(imgFile)).toBe(false);
    });

    test.each(FILE_PROCESSING_SCENARIOS)('$name', scenario => {
      const file = new TFile(scenario.filePath);
      if (scenario.parentPath) {
        file.parent = { path: scenario.parentPath };
      }

      if (scenario.settings) {
        plugin.settings = {
          ...plugin.settings,
          ...scenario.settings,
        };
      }

      expect(plugin.shouldProcessFile(file)).toBe(scenario.shouldProcess);
    });

    test('should handle files in root directory', () => {
      const rootFile = new TFile('root-note.md');
      rootFile.parent = null;
      expect(plugin.shouldProcessFile(rootFile)).toBe(true);
    });
  });

  describe('processFile', () => {
    beforeEach(() => {
      // Setup mocks with proper Jest mock functions
      mockApp.vault.read = jest.fn();
      mockApp.fileManager.processFrontMatter = jest.fn();
    });

    test('should add "Pending tasks: true" for files with pending tasks', async () => {
      const file = new TFile('test.md');

      (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_PENDING_TASKS);

      let capturedFrontmatter: any;
      (mockApp.fileManager.processFrontMatter as jest.Mock).mockImplementation(
        (file: TFile, callback: (fm: any) => void) => {
          const frontmatter = {};
          callback(frontmatter);
          capturedFrontmatter = frontmatter;
          return Promise.resolve();
        },
      );

      await plugin.processFile(file);

      expect(mockApp.vault.read).toHaveBeenCalledWith(file);
      expect(mockApp.fileManager.processFrontMatter).toHaveBeenCalledWith(file, expect.any(Function));
      expect(capturedFrontmatter).toEqual({ 'Pending tasks': true });
    });

    test('should remove "Pending tasks" property when all tasks are completed', async () => {
      const file = new TFile('test.md');

      (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_ALL_COMPLETED_TASKS);

      let capturedFrontmatter: any;
      (mockApp.fileManager.processFrontMatter as jest.Mock).mockImplementation(
        (file: TFile, callback: (fm: any) => void) => {
          const frontmatter = { 'Pending tasks': true, 'other-prop': 'value' };
          callback(frontmatter);
          capturedFrontmatter = frontmatter;
          return Promise.resolve();
        },
      );

      await plugin.processFile(file);

      expect(capturedFrontmatter).toEqual({ 'other-prop': 'value' });
      expect(capturedFrontmatter).not.toHaveProperty('Pending tasks');
    });

    test('should remove "Pending tasks" property when no tasks exist', async () => {
      const file = new TFile('test.md');

      (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_NO_TASKS);

      let capturedFrontmatter: any;
      (mockApp.fileManager.processFrontMatter as jest.Mock).mockImplementation(
        (file: TFile, callback: (fm: any) => void) => {
          const frontmatter = { 'Pending tasks': true };
          callback(frontmatter);
          capturedFrontmatter = frontmatter;
          return Promise.resolve();
        },
      );

      await plugin.processFile(file);

      expect(capturedFrontmatter).toEqual({});
      expect(capturedFrontmatter).not.toHaveProperty('Pending tasks');
    });

    test('should use custom property name from settings', async () => {
      plugin.settings.propertyName = 'Custom Property';
      const file = new TFile('test.md');

      (mockApp.vault.read as jest.Mock).mockResolvedValue('- [ ] Task');

      let capturedFrontmatter: any;
      (mockApp.fileManager.processFrontMatter as jest.Mock).mockImplementation(
        (file: TFile, callback: (fm: any) => void) => {
          const frontmatter = {};
          callback(frontmatter);
          capturedFrontmatter = frontmatter;
          return Promise.resolve();
        },
      );

      await plugin.processFile(file);

      expect(capturedFrontmatter).toEqual({ 'Custom Property': true });
    });

    test('should not process files that should be excluded', async () => {
      const file = new TFile('Templates/template.md');
      file.parent = { path: 'Templates' };
      plugin.settings.excludeFolders = ['Templates'];

      await plugin.processFile(file);

      expect(mockApp.vault.read).not.toHaveBeenCalled();
      expect(mockApp.fileManager.processFrontMatter).not.toHaveBeenCalled();
    });

    test('should handle file read errors gracefully', async () => {
      const file = new TFile('test.md');
      const error = new Error('File read error');

      (mockApp.vault.read as jest.Mock).mockRejectedValue(error);
      const consoleSpy = jest.spyOn(console, 'error').mockImplementation();

      await plugin.processFile(file);

      expect(consoleSpy).toHaveBeenCalledWith(`Auto Status Plugin: Error processing file ${file.path}:`, error);

      consoleSpy.mockRestore();
    });

    describe('task count properties', () => {
      const captureFrontmatter = (initial: Record<string, unknown> = {}) => {
        const captured: { value: Record<string, unknown> } = { value: {} };
        (mockApp.fileManager.processFrontMatter as jest.Mock).mockImplementation(
          (_file: TFile, callback: (fm: any) => void) => {
            const frontmatter = { ...initial };
            callback(frontmatter);
            captured.value = frontmatter;
            return Promise.resolve();
          },
        );
        return captured;
      };

      test('does not write count properties when disabled', async () => {
        plugin.settings.enableTaskCounts = false;
        (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_PENDING_TASKS);
        const captured = captureFrontmatter();

        await plugin.processFile(new TFile('test.md'));

        expect(captured.value).not.toHaveProperty('Pending tasks count');
        expect(captured.value).not.toHaveProperty('Total tasks count');
      });

      test('removes existing count properties when feature is disabled', async () => {
        plugin.settings.enableTaskCounts = false;
        (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_PENDING_TASKS);
        const captured = captureFrontmatter({
          'Pending tasks count': 99,
          'Total tasks count': 99,
          'other-prop': 'keep',
        });

        await plugin.processFile(new TFile('test.md'));

        expect(captured.value).toEqual({ 'Pending tasks': true, 'other-prop': 'keep' });
      });

      test('writes count properties when enabled and tasks exist', async () => {
        plugin.settings.enableTaskCounts = true;
        (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_PENDING_TASKS);
        const captured = captureFrontmatter();

        await plugin.processFile(new TFile('test.md'));

        expect(captured.value).toEqual({
          'Pending tasks': true,
          'Pending tasks count': 3,
          'Total tasks count': 6,
        });
      });

      test('writes zero pending when all tasks are completed', async () => {
        plugin.settings.enableTaskCounts = true;
        (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_ALL_COMPLETED_TASKS);
        const captured = captureFrontmatter();

        await plugin.processFile(new TFile('test.md'));

        expect(captured.value).toEqual({
          'Pending tasks count': 0,
          'Total tasks count': 5,
        });
      });

      test('deletes count properties when no tasks exist', async () => {
        plugin.settings.enableTaskCounts = true;
        (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_NO_TASKS);
        const captured = captureFrontmatter({
          'Pending tasks count': 5,
          'Total tasks count': 10,
        });

        await plugin.processFile(new TFile('test.md'));

        expect(captured.value).toEqual({});
      });

      test('respects countRootTasksOnly for counts and boolean', async () => {
        plugin.settings.enableTaskCounts = true;
        plugin.settings.countRootTasksOnly = true;
        (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_NESTED_TASKS);
        const captured = captureFrontmatter();

        await plugin.processFile(new TFile('test.md'));

        expect(captured.value).toEqual({
          'Pending tasks': true,
          'Pending tasks count': 1,
          'Total tasks count': 1,
        });
      });

      test('uses custom count property names', async () => {
        plugin.settings.enableTaskCounts = true;
        plugin.settings.pendingTasksCountProperty = 'pending_n';
        plugin.settings.totalTasksCountProperty = 'total_n';
        (mockApp.vault.read as jest.Mock).mockResolvedValue(NOTES_WITH_PENDING_TASKS);
        const captured = captureFrontmatter();

        await plugin.processFile(new TFile('test.md'));

        expect(captured.value).toEqual({
          'Pending tasks': true,
          pending_n: 3,
          total_n: 6,
        });
      });
    });

    test('should handle frontmatter processing errors gracefully', async () => {
      const file = new TFile('test.md');
      const error = new Error('Frontmatter processing error');

      (mockApp.vault.read as jest.Mock).mockResolvedValue('- [ ] Task');
      (mockApp.fileManager.processFrontMatter as jest.Mock).mockRejectedValue(error);

      const consoleSpy = jest.spyOn(console, 'error').mockImplementation();

      await plugin.processFile(file);

      expect(consoleSpy).toHaveBeenCalledWith(`Auto Status Plugin: Error processing file ${file.path}:`, error);

      consoleSpy.mockRestore();
    });
  });

  describe('processAllNotes', () => {
    beforeEach(() => {
      mockApp.vault.getMarkdownFiles = jest.fn();
      plugin.processFile = jest.fn();
    });

    test('should process all eligible markdown files', async () => {
      const files = [new TFile('note1.md'), new TFile('note2.md'), new TFile('Templates/template.md')];
      files[2].parent = { path: 'Templates' };

      plugin.settings.excludeFolders = ['Templates'];
      (mockApp.vault.getMarkdownFiles as jest.Mock).mockReturnValue(files);

      await plugin.processAllNotes();

      expect(plugin.processFile).toHaveBeenCalledTimes(2);
      expect(plugin.processFile).toHaveBeenCalledWith(files[0]);
      expect(plugin.processFile).toHaveBeenCalledWith(files[1]);
      expect(plugin.processFile).not.toHaveBeenCalledWith(files[2]);
    });

    test('should show completion notice', async () => {
      const files = [new TFile('note1.md'), new TFile('note2.md')];
      (mockApp.vault.getMarkdownFiles as jest.Mock).mockReturnValue(files);

      await plugin.processAllNotes();

      expect(Notice).toHaveBeenCalledWith('Auto Status: Processed 2 notes');
    });
  });
});