// Note: This code assumes you have Mocha, Chai, and Sinon loaded in your test environment
// along with jQuery and html2canvas. You'll also need to include your screen capture plugin.

describe('Screen Capture Plugin', function() {
    var $button, sandbox, originalBodyHTML;

    beforeEach(function() {
        originalBodyHTML = document.body.innerHTML;
        // Create a test element and initialize the plugin
        $button = $('.' + flagCaptureScreen);
        $button.screenshotButton();
        // $button = $button.find('button');
        
        // Create a sinon sandbox for mocking
        sandbox = sinon.createSandbox();
    });

    afterEach(function() {
        // Clean up
        sandbox.restore();
    });

    after(function() {
        document.body.innerHTML = originalBodyHTML;
    });

    // 1. Initialization and Setup
    describe('1. Initialization and Setup', function() {
        it('a. should initialize correctly on a given DOM element', function() {
            expect($button).to.exist;
        });

        it('b. should create the button with correct text', function() {
            expect($button.text()).to.equal('Capture Screen');
        });

        it('c. should make the button visible on the page', function() {
            expect($button.is(':visible')).to.be.true;
        });
    });

    // 2. Button Functionality
    describe('2. Button Functionality', function() {
        it('a. should trigger screenshot process on click', function(done) {
            // const canvasStub = sinon.stub(document.createElement('canvas'));
            sinon.stub(window, 'html2canvas').resolves(document.createElement('canvas'));
            // await waitForClick($button);
            $button.click();
            setTimeout(() => {
                expect(html2canvas.called).to.be.true;
                expect(html2canvas.callCount).to.equal(1);
                html2canvas.restore();
                done();
            }, 1000);
        });

        it('b. should hide button during screenshot process', 
            /*
            async function() {
            sinon.stub(window, 'html2canvas').resolves(document.createElement('canvas'));
            let resolve;
            const promise = new Promise((r) => resolve = r);
            function handleButtonClick() {
                resolve();
                $button.off('click', handleButtonClick);
            }
            $button.on("click", function() { 
                handleButtonClick();
            });
            $button.click();
            expect($button.hasClass(flagIsHidden)).to.be.true;
            html2canvas.restore();
        }
            */
            function(done) {
                sinon.stub(window, 'html2canvas').resolves(document.createElement('canvas'));
                $button.click();
                expect($button.hasClass(flagIsHidden)).to.be.true;
                html2canvas.restore();
                done();
            }
        );

        it('c. should show button after screenshot is taken', function(done) {
            sinon.stub(window, 'html2canvas').resolves(document.createElement('canvas'));
            /*
            await waitForClick($button).then(() => {
                setTimeout(() => {
                    expect($button.hasClass(flagIsHidden)).to.be.false;
                    // html2canvas.restore();
                }, 100); // delay for screenshot and callback process
            })
            .catch((err) => {
                html2canvas.restore();
                throw err;
            });
            */
            $button.click();
            setTimeout(() => {
                expect($button.hasClass(flagIsHidden)).to.be.false;
                html2canvas.restore();
                done();
            }, 1000); // delay for screenshot and callback process
        });
    });

    // 3. Input Handling
    describe('3. Input Handling', function() {
        let $input, $textarea;

        beforeEach(function() {
            $input = $('<input type="text" value="test">').appendTo('body');
            $textarea = $('<textarea>test</textarea>').appendTo('body');
        });

        afterEach(function() {
            $input.remove();
            $textarea.remove();
        });

        it('a. should clear input and textarea values during screenshot', function(done) {
            sinon.stub(window, 'html2canvas').resolves(document.createElement('canvas'));
            $button.click();
            expect($input.val()).to.equal('');
            expect($textarea.val()).to.equal('');
            html2canvas.restore();
            done();
        });

        it('b. should restore input and textarea values after screenshot', function(done) {
            sinon.stub(window, 'html2canvas').resolves(document.createElement('canvas'));
            /*
            await waitForClick($button).then(() => {
                setTimeout(() => {
                    expect($input.val()).to.equal('test');
                    expect($textarea.val()).to.equal('test');
                }, 1000); // delay for screenshot and callback process
            })
            /*
            .catch((err) => {
                html2canvas.restore();
                throw err;
            })*
            ;
            */
            $button.click();
            setTimeout(() => {
                expect($input.val()).to.equal('test');
                expect($textarea.val()).to.equal('test');
                done();
            }, 1000);
            html2canvas.restore();
        });
    });

    // 4. Modal and Floating Element Handling
    describe('4. Modal and Floating Element Handling', function() {
        let $modal;

        beforeEach(function() {
            $modal = $('<div class="modal">Modal Content</div>').appendTo('body');
        });

        afterEach(function() {
            $modal.remove();
        });

        it('a. should capture visible modals', async function() {
            sinon.stub(window, 'html2canvas').callsFake(function(element) {
                expect($(element).find('.modal').length).to.equal(5);
                return Promise.resolve(document.createElement('canvas'));
            });
            await waitForClick($button);
            html2canvas.restore();
        });
    });

    // 5. HTML2Canvas Integration
    describe('5. HTML2Canvas Integration', function() {
        it('a. should call html2canvas with correct parameters', async function() {
            const html2canvasStub = sinon.stub(window, 'html2canvas').resolves(document.createElement('canvas'));
            await waitForClick($button);
            html2canvas.restore();
            expect(html2canvasStub.calledWith(document.body)).to.be.true;
        });

        it('b. should handle html2canvas errors gracefully', async function() {
            sinon.stub(window, 'html2canvas').rejects(new Error('Test error'));
            sinon.stub(console, 'error');
            await waitForClick($button);
            html2canvas.restore();
            expect(console.error.called).to.be.true;
            console.error.restore();
        });
    });

    // 6. Screenshot Generation
    describe('6. Screenshot Generation', function() {
        /* Base64 string used instead of Blob
        it('a. should create a blob from the canvas', async function() {
            const canvas = document.createElement('canvas');
            sinon.stub(window, 'html2canvas').resolves(canvas);
            sinon.stub(canvas, 'toBlob').callsArgWith(0, new Blob());
            await waitForClick($button);
            html2canvas.restore();
            expect(canvas.toBlob.called).to.be.true;
            canvas.toBlob.restore();
        });
        */

        it('b. should generate a Base64 PNG string when saving is confirmed', async function() {
            const consoleStub = sinon.stub(console, 'log');
            await waitForClick($button).then(() => {
                setTimeout(() => {
                    expect(consoleStub.callCount).to.equal(2);
                    const base64String = consoleStub.getCall(0).args[1];
                    expect(base64String).to.be.a('string');
                    expect(base64String).to.match(/^data:image\/png;base64,/);
                    consoleStub.restore();
                }, 1000); // delay for screenshot and callback process
            });
        });
    });

    // 7. Download Functionality
    describe('7. Download Functionality', function() {
        it('a. should create a temporary anchor element for download', async function() {
            // Stub document.createElement
            createElementStub = sinon.stub(document, 'createElement').callsFake(function(tagName) {
                if (tagName === 'a') {
                    return {
                        style: {},
                        href: '',
                        download: '',
                        click: sinon.spy()
                    };
                }
            });

            // Stub document.body.appendChild and removeChild
            appendChildStub = sinon.stub(document.body, 'appendChild');
            removeChildStub = sinon.stub(document.body, 'removeChild');

            // Mock blob and URL
            blobMock = new Blob(['test'], { type: 'text/plain' });
            urlMock = 'blob:http://example.com/test';
            sinon.stub(URL, 'createObjectURL').returns(urlMock);
            sinon.stub(URL, 'revokeObjectURL');
            
            await waitForClick($button).then(() => {
                setTimeout(() => {
                    // Assertions
                    expect(createElementStub.calledWith('a')).to.be.true;
                    expect(appendChildStub.calledOnce).to.be.true;
                    expect(removeChildStub.calledOnce).to.be.true;

                    const aElement = appendChildStub.getCall(0).args[0];
                    expect(aElement.href).to.equal(urlMock);
                    expect(aElement.download).to.equal('screenshot.png'); // Assuming settings.fileName is 'screenshot.png'
                }, 1000);
            });
            /*
            const appendChildStub = sandbox.stub(document.body, 'appendChild').callsFake((element) => {
                console.log("attempting to append element: ", element);
                if (element.tagName === 'IFRAME') {
                    // Allow iframe to be appended normally
                    document.body.appendChild.wrappedMethod.call(document.body, element);
                }
            });
            sandbox.stub(document.body, 'removeChild');
            sandbox.stub(URL, 'createObjectURL').returns('blob:test');
            sandbox.stub(URL, 'revokeObjectURL');

            await waitForClick($button).then(() => {
                setTimeout(() => {
                    expect(document.body.appendChild.calledOnce).to.be.true;
                    expect(document.body.appendChild.args[0][0].tagName).to.equal('A');
                }, 1000); // delay for screenshot and callback process
            });
            */
        });

        it('b. should click the temporary anchor element programmatically', async function() {
            const fakeAnchor = {
                style: {},
                click: sinon.spy()
            };
            sandbox.stub(document, 'createElement').returns(fakeAnchor);

            await waitForClick($button);
            expect(fakeAnchor.click.calledOnce).to.be.true;
        });

        it('c. should remove the temporary anchor after download', async function() {
            sandbox.stub(document.body, 'removeChild');

            await waitForClick($button);
            expect(document.body.removeChild.calledOnce).to.be.true;
        });
    });

    // 8. Cross-browser Compatibility
    describe('8. Cross-browser Compatibility', function() {
        it('a. should work in Chrome-like environments', function() {
            // Assuming we're running tests in a Chrome-like environment
            expect(() => $button.screenshotButton()).to.not.throw();
        });

        // Additional browser-specific tests would go here
        // These might need to be run in different environments or with browser mocks
    });

    // 9. Performance
    describe('9. Performance', function() {
        it('a. should capture and generate screenshot within acceptable time', async function() {
            this.timeout(5000); // Adjust timeout as needed

            const startTime = performance.now();

            await waitForClick($button);

            const endTime = performance.now();
            const duration = endTime - startTime;
            expect(duration).to.be.below(1000); // Adjust threshold as needed
        });

        // Additional performance tests with different page complexities would go here
    });

    // 10. Error Handling
    describe('10. Error Handling', function() {
        it('a. should log error when html2canvas is not loaded', async function() {
            const consoleErrorStub = sandbox.stub(console, 'error');
            const originalHtml2Canvas = window.html2canvas;
            delete window.html2canvas;

            await waitForClick($button);

            expect(consoleErrorStub.calledOnce).to.be.true;
            expect(consoleErrorStub.args[0][0]).to.include('html2canvas is not loaded');

            // Restore html2canvas
            window.html2canvas = originalHtml2Canvas;
        });

        it('a. should handle errors during capture process', async function() {
            sandbox.stub(window, 'html2canvas').rejects(new Error('Capture failed'));
            const consoleErrorStub = sandbox.stub(console, 'error');

            await waitForClick($button);

            expect(consoleErrorStub.calledOnce).to.be.true;
            expect(consoleErrorStub.args[0][0]).to.include('Capture failed');
        });
    });

    // Configuration Options
    describe('11. Configuration Options', function() {
        it('11.1 should apply custom button text correctly', function() {
            const customText = 'Capture Screen';
            $button.screenshotButton({ buttonText: customText });
            expect($button.text()).to.equal(customText);
        });

        it('11.2 should use custom filename for the downloaded image', async function() {
            const customFileName = 'custom-screenshot.png';
            $button.screenshotButton({ fileName: customFileName });

            // Mock html2canvas and URL.createObjectURL
            global.html2canvas = sinon.stub().resolves({ toBlob: (callback) => callback(new Blob()) });
            global.URL.createObjectURL = sinon.stub().returns('blob:url');

            // Mock anchor creation and click
            const anchorMock = {
                style: {},
                click: sinon.spy(),
                remove: sinon.spy()
            };
            sinon.stub(document, 'createElement').returns(anchorMock);

            await waitForClick($button);

            expect(anchorMock.download).to.equal(customFileName);
            document.createElement.restore();
        });

        it('11.3 should respect custom modal selectors during capture', async function() {
            const customSelector = '.custom-modal';
            $button.screenshotButton({ modalsSelector: customSelector });

            // Create a custom modal element
            $('<div class="custom-modal">Custom Modal</div>').appendTo('body');

            // Mock html2canvas
            global.html2canvas = sinon.spy((element, options) => {
                expect(options.ignoreElements).to.be.a('function');
                const customModal = document.querySelector(customSelector);
                expect(options.ignoreElements(customModal)).to.be.false;
                done();
                return Promise.resolve({ toBlob: () => {} });
            });

            await waitForClick($button);
        });
    });

    // Accessibility
    describe('12. Accessibility', function() {
        it('12.1 should have appropriate ARIA attributes', function() {
            $button.screenshotButton(defaultOptions);
            expect($button.attr('role')).to.equal('button');
            expect($button.attr('aria-label')).to.equal(defaultOptions.buttonText);
        });

        it('12.2 should be keyboard accessible', async function() {
            $button.screenshotButton(defaultOptions);
            $button.on('keydown', function(e) {
                if (e.which === 13) {  // Enter key
                    done();
                }
            });
            const event = new KeyboardEvent('keydown', { 'keyCode': 13 });
            $button[0].dispatchEvent(event);
        });
    });

    // Security
    describe('13. Security', function() {
        it('13.1 should not capture sensitive information in inputs and textareas', async function() {
            $button.screenshotButton(defaultOptions);

            // Create test input and textarea with sensitive information
            $('<input type="text" value="sensitive-info">').appendTo('body');
            $('<textarea>confidential-data</textarea>').appendTo('body');

            // Mock html2canvas
            global.html2canvas = sinon.spy(() => {
                const inputs = document.querySelectorAll('input, textarea');
                inputs.forEach(input => {
                    expect(input.value).to.be.empty;
                });
                done();
                return Promise.resolve({ toBlob: () => {} });
            });

            await waitForClick($button);
        });

        it('13.2 should restore input and textarea values after capture', async function() {
            $button.screenshotButton(defaultOptions);

            const inputValue = 'sensitive-info';
            const textareaValue = 'confidential-data';

            // Create test input and textarea with sensitive information
            $('<input type="text" value="' + inputValue + '">').appendTo('body');
            $('<textarea>' + textareaValue + '</textarea>').appendTo('body');

            // Mock html2canvas and URL.createObjectURL
            global.html2canvas = sinon.stub().resolves({ toBlob: (callback) => callback(new Blob()) });
            global.URL.createObjectURL = sinon.stub().returns('blob:url');

            await waitForClick($button);

            setTimeout(() => {
                const inputs = document.querySelectorAll('input, textarea');
                inputs.forEach(input => {
                    if (input.tagName === 'INPUT') {
                        expect(input.value).to.equal(inputValue);
                    } else if (input.tagName === 'TEXTAREA') {
                        expect(input.value).to.equal(textareaValue);
                    }
                });
                done();
            }, 0);
        });
    });

    // CSS Interaction
    describe('14. CSS Interaction', function() {
        it('14.1 should not break existing page styles', function() {
            const originalStyles = getComputedStyle(document.body);
            $button.screenshotButton();
            const newStyles = getComputedStyle(document.body);
            expect(originalStyles.cssText).to.equal(newStyles.cssText);
        });

        it('14.2 should apply correct button styling', function() {
            $button.screenshotButton();
            const $button = $button.find('button');
            const buttonStyles = getComputedStyle($button[0]);
            expect(buttonStyles.display).to.not.equal('none');
            // Add more specific style checks as per your plugin's CSS
        });
    });

    // jQuery Plugin Standards
    describe('15. jQuery Plugin Standards', function() {
        it('15.1 should return jQuery object for chaining', function() {
            const result = $button.screenshotButton();
            expect(result).to.equal($button);
        });

        it('15.2 should initialize plugin on multiple elements', function() {
            $('body').append('<div class="test-class"></div><div class="test-class"></div>');
            $('.test-class').screenshotButton();
            expect($('.test-class').find('button').length).to.equal(2);
        });
    });

    // Memory Management
    describe('16. Memory Management', function() {
        it('16.1 should not leak memory on repeated initialization and destruction', function() {
            const initialMemory = performance.memory ? performance.memory.usedJSHeapSize : 0;
            for (let i = 0; i < 100; i++) {
                $button.screenshotButton();
                $button.empty();
            }
            const finalMemory = performance.memory ? performance.memory.usedJSHeapSize : 0;
            expect(finalMemory - initialMemory).to.be.below(1000000); // Less than 1MB increase
        });

        it('16.2 should remove all created DOM elements after use', function() {
            $button.screenshotButton();
            const initialChildCount = $button[0].childElementCount;
            $button.find('button').click();
            // Assuming the screenshot process is synchronous for this test
            expect($button[0].childElementCount).to.equal(initialChildCount);
        });
    });

    // Responsiveness
    describe('17. Responsiveness', function() {
        it('17.1 should behave correctly on different screen sizes', function() {
            const viewports = [
                {width: 320, height: 568},  // iPhone 5
                {width: 1024, height: 768}, // iPad
                {width: 1920, height: 1080} // Full HD
            ];

            viewports.forEach(size => {
                $button.width(size.width).height(size.height);
                $button.screenshotButton();
                const $button = $button.find('button');
                expect($button.is(':visible')).to.be.true;
                expect($button.width()).to.be.at.most(size.width);
            });
        });

        it('17.2 should capture accurate viewport in screenshot', async function() {
            $button.width(800).height(600);
            $button.html('<div id="content" style="width: 100%; height: 100%; background-color: red;"></div>');
            $button.screenshotButton();

            const $button = $button.find('button');
            await waitForClick($button);

            // Mock html2canvas to check if it's called with correct dimensions
            sinon.replace(window, 'html2canvas', sinon.fake.returns(Promise.resolve({
                toBlob: (callback) => callback(new Blob(['fakepngdata'], {type: 'image/png'}))
            })));

            setTimeout(() => {
                expect(html2canvas.calledOnce).to.be.true;
                const args = html2canvas.firstCall.args[1];
                expect(args.width).to.equal(800);
                expect(args.height).to.equal(600);
                sinon.restore();
                done();
            }, 100);
        });
    });
});