import request from 'supertest';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import axios from 'axios';
import MockAdapter from 'axios-mock-adapter';
import { fetchCalendarData } from '../src/calendarUtil.js';

// ESM equivalent of __dirname
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const CALENDARS_DIR = path.join(process.cwd(), 'calendar');
const TEST_CALENDARS_DIR = path.join(__dirname, 'test_calendars');
const EXPECTED_OUTPUTS_DIR = path.join(__dirname, 'expected_outputs');

let server;
process.chdir(__dirname)
const app = await import('../src/server');

describe('Calendar Merging API', () => {
    beforeAll(async () => {
        // Start the server
        server = app.default.listen(0);
    });

    afterAll(async () => {
        // Ensure the server is closed before cleanup
        await new Promise(resolve => server.close(resolve));

        // Clean up the merged calendars directory after tests
        if (fs.existsSync(CALENDARS_DIR)) {
            fs.rmSync(CALENDARS_DIR, { recursive: true, force: true });
        }

        // Optional: Add a delay to ensure all handles are released
        await new Promise(resolve => setTimeout(resolve, 100));
    });

    const getTestCalendarFilename = (filename) => {
        return path.join(TEST_CALENDARS_DIR, filename);
    };

    const loadExpectedOutput = (filename) => {
        return fs.readFileSync(path.join(EXPECTED_OUTPUTS_DIR, filename), 'utf8');
    };

    test('Preserve nextcloud calendar', async () => {
        const input = getTestCalendarFilename('nextcloud-minimal.ics');
        const response = await request(server)
            .post('/merge')
            .send({
                linkGroupName: 'nextcloud-minimal',
                calendars: [
                    {
                        url: input,
                        prefix: '',
                        override: false,
                    },
                ],
            });
        expect(response.status).toBe(200);
        // Check if the file was created in the test directory
        const filePath = path.join(CALENDARS_DIR, 'nextcloud-minimal.ics');
        console.log('Checking if file exists at:', filePath);
        expect(fs.existsSync(filePath)).toBe(true);

        // Load expected output
        const expectedOutput = fs.readFileSync(input, 'utf8');
        const actualOutput = fs.readFileSync(filePath, 'utf8');
        
        //compare
        expect(actualOutput).toBe(expectedOutput);
    });

    test('Preserve google calendar', async () => {
        const input = getTestCalendarFilename('google-calendar-minimal.ics');
        const response = await request(server)
            .post('/merge')
            .send({
                linkGroupName: 'google-calendar-minimal',
                calendars: [
                    {
                        url: input,
                        prefix: '',
                        override: false,
                    },
                ],
            });
        expect(response.status).toBe(200);
        // Check if the file was created in the test directory
        const filePath = path.join(CALENDARS_DIR, 'google-calendar-minimal.ics');
        console.log('Checking if file exists at:', filePath);
        expect(fs.existsSync(filePath)).toBe(true);

        // Load expected output
        const expectedOutput = fs.readFileSync(input, 'utf8');
        const actualOutput = fs.readFileSync(filePath, 'utf8');
        
        //compare
        expect(actualOutput).toBe(expectedOutput);
    });


    test('Preserve date-based calendar', async () => {
        const input = getTestCalendarFilename('US_Holidays.ics');
        const response = await request(server)
            .post('/merge')
            .send({
                linkGroupName: 'US Holidays',
                calendars: [
                    {
                        url: input,
                        prefix: '',
                        override: false,
                    },
                ],
            });
        expect(response.status).toBe(200);
        // Check if the file was created in the test directory
        const filePath = path.join(CALENDARS_DIR, 'US_Holidays.ics');
        console.log('Checking if file exists at:', filePath);
        expect(fs.existsSync(filePath)).toBe(true);
        // Load expected output and compare
        const expectedOutput = fs.readFileSync(input, 'utf8');
        const actualOutput = fs.readFileSync(filePath, 'utf8');
        expect(actualOutput).toBe(expectedOutput);
    });

    test('Merge date-based calendar', async () => {
        const response = await request(server)
            .post('/merge')
            .send({
                linkGroupName: 'Date Based Calendar',
                calendars: [
                    {
                        url: getTestCalendarFilename('holiday_calendar_2023.ics'),
                        prefix: 'holiday_calendar_2023',
                        override: false,
                    },
                    {
                        url: getTestCalendarFilename('US_Holidays.ics'),
                        prefix: 'US_holidays',
                        override: false,
                    },
                ],
            });
        expect(response.status).toBe(200);
        expect(response.body.url).toMatch(new RegExp(`calendar/Date_Based_Calendar`));

        // Check if the file was created in the test directory
        const filePath = path.join(CALENDARS_DIR, 'Date_Based_Calendar.ics');
        console.log('Checking if file exists at:', filePath);
        expect(fs.existsSync(filePath)).toBe(true);

        // Load expected output and compare
        const expectedOutput = loadExpectedOutput('Date_Based_Calendar.ics');
        const actualOutput = fs.readFileSync(filePath, 'utf8');
        expect(actualOutput).toBe(expectedOutput);
    });
    
    //test Merge time-based calendar
    test('Merge time-based calendar', async () => {
        const input = getTestCalendarFilename('work_task_calendar.ics');
        const response = await request(server)
            .post('/merge')
            .send({
                linkGroupName: 'Time Based Calendar',
                calendars: [
                    {
                        url: getTestCalendarFilename('team_meeting_calendar.ics'), // Time-based calendar
                        prefix: 'team_meeting_calendar',
                        override: false,
                    },
                    {
                        url: getTestCalendarFilename('work_task_calendar.ics'), // Time-based calendar
                        prefix: 'Work_Task',
                        override: false,
                    },
                ],
            });

        expect(response.status).toBe(200);
        expect(response.body.url).toMatch(/calendar\/Time_Based_Calendar/);
        
        // Check if the file was created in the test directory
        const filePath = path.join(CALENDARS_DIR, 'Time_Based_Calendar.ics');
        expect(fs.existsSync(filePath)).toBe(true);

        // Load expected output and compare
        const expectedOutput = loadExpectedOutput('Time_Based_Calendar.ics');
        const actualOutput = fs.readFileSync(filePath, 'utf8');
        expect(actualOutput).toBe(expectedOutput);
    });
    
    //test Merge calendar without prefix
    test('Merge calendar without prefix', async () => {
        const response = await request(server)
            .post('/merge')
            .send({
                linkGroupName: 'No Prefix Calendar',
                calendars: [
                    {
                        url: getTestCalendarFilename('sf_public_holidays.ics'),
                        prefix: '',
                        override: false,
                    },
                ],
            });

        expect(response.status).toBe(200);
        expect(response.body.url).toMatch(/calendar\/No_Prefix_Calendar/);
        
        // Check if the file was created in the test directory
        const filePath = path.join(CALENDARS_DIR, 'No_Prefix_Calendar.ics');
        expect(fs.existsSync(filePath)).toBe(true);

        // Load expected output and compare
        const expectedOutput = loadExpectedOutput('No_Prefix_Calendar.ics');
        const actualOutput = fs.readFileSync(filePath, 'utf8');
        expect(actualOutput).toBe(expectedOutput);
    });
    
    //test Merge calendar with override
    test('Merge calendar with override', async () => {
        const response = await request(server)
            .post('/merge')
            .send({
                linkGroupName: 'Override Calendar',
                calendars: [
                    {
                        url: getTestCalendarFilename('sf_public_holidays.ics'),
                        prefix: 'Override Event',
                        override: true,
                    },
                ],
            });

        expect(response.status).toBe(200);
        expect(response.body.url).toMatch(/calendar\/Override_Calendar/);
        
        // Check if the file was created in the test directory
        const filePath = path.join(CALENDARS_DIR, 'Override_Calendar.ics');
        expect(fs.existsSync(filePath)).toBe(true);

        // Load expected output and compare
        const expectedOutput = loadExpectedOutput('Override_Calendar.ics');
        const actualOutput = fs.readFileSync(filePath, 'utf8');
        expect(actualOutput).toBe(expectedOutput);
    });

    //test Merge date-based and time-based calendars
    test('Merge date-based and time-based calendars', async () => {
    const response = await request(server)
        .post('/merge')
        .send({
            linkGroupName: 'Merged Date and Time Based Calendar',
            calendars: [
                {
                    url: getTestCalendarFilename('holiday_calendar_2023.ics'), // Date-based calendar
                    prefix: 'Holiday_2023',
                    override: false,
                },
                {
                    url: getTestCalendarFilename('work_task_calendar.ics'), // Time-based calendar
                    prefix: 'Work_Task',
                    override: false,
                },
            ],
        });

    expect(response.status).toBe(200);
    expect(response.body.url).toMatch(new RegExp('calendar/Merged_Date_and_Time_Based_Calendar'));

    // Check if the file was created in the test directory
    const filePath = path.join(CALENDARS_DIR, 'Merged_Date_and_Time_Based_Calendar.ics');
    expect(fs.existsSync(filePath)).toBe(true);

    // Load expected output and compare
    const expectedOutput = loadExpectedOutput('Merged_Date_and_Time_Based_Calendar.ics');
    const actualOutput = fs.readFileSync(filePath, 'utf8');
    expect(actualOutput).toBe(expectedOutput);
    });

    describe('Smart URL Handling', () => {
        let mockAxios;
      
        beforeAll(() => {
          mockAxios = new MockAdapter(axios);
        });

        afterEach(() => {
            mockAxios.reset();
        });

        afterAll(() => {
            mockAxios.restore();
        });
      
        test('should use original URL when valid without .ics', async () => {
          const validUrl = 'https://cals.ftt.gmbh/calendar/germanholithunder';
          mockAxios.onGet(validUrl).reply(200, 'VALID_CALENDAR');
          
          const result = await fetchCalendarData({ url: validUrl });
          expect(result.data).toBe('VALID_CALENDAR');
        });
      
        test('should try .ics version when original fails', async () => {
          const invalidUrl = 'https://cals.ftt.gmbh/calendar/germanholithunder.ics';
          const validUrl = invalidUrl.slice(0, -4);
          
          mockAxios
            .onGet(invalidUrl).reply(404)
            .onGet(validUrl).reply(200, 'VALID_CALENDAR');
      
          const result = await fetchCalendarData({ url: invalidUrl });
          expect(result.data).toBe('VALID_CALENDAR');
        });
      
        test('should preserve valid .ics URLs', async () => {
          const googleUrl = 'https://calendar.google.com/.../basic.ics';
          mockAxios.onGet(googleUrl).reply(200, 'GOOGLE_CALENDAR');
          
          const result = await fetchCalendarData({ url: googleUrl });
          expect(result.data).toBe('GOOGLE_CALENDAR');
        });
      
        test('should try both versions for ambiguous URLs', async () => {
          const baseUrl = 'https://example.com/calendar';
          const icsUrl = baseUrl + '.ics';
          
          mockAxios
            .onGet(baseUrl).reply(404)
            .onGet(icsUrl).reply(200, 'ICS_CALENDAR');
      
          const result = await fetchCalendarData({ url: baseUrl });
          expect(result.data).toBe('ICS_CALENDAR');
        });
    });
});