// DOM Elements
const elements = {
    sidebar: document.getElementById('sidebar'),
    apiTester: document.getElementById('apiTester'),
    closeTester: document.getElementById('closeTester'),
    getApiKeyBtn: document.getElementById('getApiKeyBtn'),
    tryApiBtn: document.getElementById('tryApiBtn'),
    toast: document.getElementById('toast')
};

// Navigation and scrolling
const setupNavigation = () => {
    // Smooth scrolling for navigation links
    document.querySelectorAll('.nav-item').forEach(link => {
        link.addEventListener('click', (e) => {
            e.preventDefault();
            const targetId = link.getAttribute('href').substring(1);
            const targetElement = document.getElementById(targetId);

            if (targetElement) {
                targetElement.scrollIntoView({
                    behavior: 'smooth',
                    block: 'start'
                });

                // Update active nav item
                document.querySelectorAll('.nav-item').forEach(item => {
                    item.classList.remove('active');
                });
                link.classList.add('active');
            }
        });
    });

    // Update active nav item on scroll
    const observerOptions = {
        rootMargin: '-100px 0px -50% 0px',
        threshold: 0
    };

    const observer = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                const id = entry.target.id;
                const navLink = document.querySelector(`[href="#${id}"]`);

                if (navLink) {
                    document.querySelectorAll('.nav-item').forEach(item => {
                        item.classList.remove('active');
                    });
                    navLink.classList.add('active');
                }
            }
        });
    }, observerOptions);

    // Observe all sections
    document.querySelectorAll('.doc-section').forEach(section => {
        observer.observe(section);
    });
};

// Code tabs functionality
const setupCodeTabs = () => {
    document.querySelectorAll('.code-tabs').forEach(tabGroup => {
        const tabs = tabGroup.querySelectorAll('.tab-btn');
        const codeExample = tabGroup.closest('.code-example');
        const contents = codeExample.querySelectorAll('.tab-content');

        tabs.forEach(tab => {
            tab.addEventListener('click', () => {
                const targetTab = tab.dataset.tab;

                // Update active tab
                tabs.forEach(t => t.classList.remove('active'));
                tab.classList.add('active');

                // Update active content
                contents.forEach(content => {
                    content.classList.remove('active');
                    if (content.id === targetTab) {
                        content.classList.add('active');
                    }
                });
            });
        });
    });
};

// Copy to clipboard functionality
const setupCopyButtons = () => {
    document.querySelectorAll('.copy-btn').forEach(button => {
        button.addEventListener('click', async () => {
            const copyTarget = button.dataset.copy;
            const targetElement = document.getElementById(copyTarget);

            if (targetElement) {
                try {
                    await navigator.clipboard.writeText(targetElement.textContent);
                    showToast('Copied to clipboard!', 'success');

                    // Visual feedback
                    const originalText = button.textContent;
                    button.textContent = 'Copied!';
                    setTimeout(() => {
                        button.textContent = originalText;
                    }, 2000);
                } catch (err) {
                    console.error('Failed to copy:', err);
                    showToast('Failed to copy to clipboard', 'error');
                }
            }
        });
    });
};

// API Tester functionality
const setupApiTester = () => {
    const tester = elements.apiTester;
    const closeTester = elements.closeTester;
    const tryApiBtn = elements.tryApiBtn;
    const sendRequestBtn = document.getElementById('sendRequest');

    // Show API tester
    tryApiBtn.addEventListener('click', () => {
        tester.classList.add('show');
        document.body.style.overflow = 'hidden';
    });

    // Close API tester
    const closeTesterModal = () => {
        tester.classList.remove('show');
        document.body.style.overflow = 'auto';
    };

    closeTester.addEventListener('click', closeTesterModal);

    // Close on outside click
    tester.addEventListener('click', (e) => {
        if (e.target === tester) {
            closeTesterModal();
        }
    });

    // Close on escape key
    document.addEventListener('keydown', (e) => {
        if (e.key === 'Escape' && tester.classList.contains('show')) {
            closeTesterModal();
        }
    });

    // Try It buttons for specific endpoints
    document.querySelectorAll('.try-it-btn').forEach(button => {
        button.addEventListener('click', () => {
            const endpoint = button.dataset.endpoint;
            populateApiTester(endpoint);
            tester.classList.add('show');
            document.body.style.overflow = 'hidden';
        });
    });

    // Send API request
    sendRequestBtn.addEventListener('click', async () => {
        await sendApiRequest();
    });
};

// Populate API tester with endpoint data
const populateApiTester = (endpoint) => {
    const methodSelect = document.getElementById('testMethod');
    const endpointInput = document.getElementById('testEndpoint');
    const headersTextarea = document.getElementById('testHeaders');
    const bodyTextarea = document.getElementById('testBody');

    const endpointConfigs = {
        projects: {
            method: 'GET',
            endpoint: '/projects',
            headers: `Authorization: Bearer your_api_key_here
Content-Type: application/json`,
            body: ''
        }
    };

    const config = endpointConfigs[endpoint];
    if (config) {
        methodSelect.value = config.method;
        endpointInput.value = config.endpoint;
        headersTextarea.value = config.headers;
        bodyTextarea.value = config.body;
    }
};

// Send API request (mock implementation)
const sendApiRequest = async () => {
    const method = document.getElementById('testMethod').value;
    const endpoint = document.getElementById('testEndpoint').value;
    const headers = document.getElementById('testHeaders').value;
    const body = document.getElementById('testBody').value;
    const responseStatus = document.getElementById('responseStatus');
    const responseBody = document.getElementById('responseBody');

    // Show loading state
    responseStatus.textContent = 'Sending request...';
    responseStatus.className = 'response-status';
    responseBody.textContent = '';

    try {
        // Parse headers
        const headerLines = headers.split('\n').filter(line => line.trim());
        const headerObj = {};
        headerLines.forEach(line => {
            const [key, ...valueParts] = line.split(':');
            if (key && valueParts.length > 0) {
                headerObj[key.trim()] = valueParts.join(':').trim();
            }
        });

        // Mock API response based on endpoint
        const mockResponse = generateMockResponse(method, endpoint);

        // Simulate network delay
        await new Promise(resolve => setTimeout(resolve, 1000));

        // Display response
        responseStatus.textContent = `${mockResponse.status} ${mockResponse.statusText}`;
        responseStatus.className = `response-status ${mockResponse.status < 400 ? 'success' : 'error'}`;
        responseBody.textContent = JSON.stringify(mockResponse.data, null, 2);

        showToast('Request completed', 'success');

    } catch (error) {
        responseStatus.textContent = '500 Internal Server Error';
        responseStatus.className = 'response-status error';
        responseBody.textContent = JSON.stringify({
            error: {
                code: 'request_failed',
                message: error.message || 'Failed to send request'
            }
        }, null, 2);

        showToast('Request failed', 'error');
    }
};

// Generate mock API responses
const generateMockResponse = (method, endpoint) => {
    const responses = {
        'GET /projects': {
            status: 200,
            statusText: 'OK',
            data: {
                data: [
                    {
                        id: 'proj_1234567890',
                        name: 'Website Redesign',
                        description: 'Complete overhaul of company website',
                        status: 'active',
                        created_at: '2025-01-15T10:30:00Z',
                        updated_at: '2025-01-20T14:22:00Z',
                        owner: {
                            id: 'user_0987654321',
                            name: 'John Doe',
                            email: 'john@company.com'
                        },
                        team_id: 'team_1122334455',
                        task_count: 24,
                        completed_tasks: 12,
                        progress: 50.0,
                        due_date: '2025-03-01T00:00:00Z',
                        tags: ['design', 'frontend', 'priority-high']
                    }
                ],
                pagination: {
                    limit: 20,
                    offset: 0,
                    total: 1,
                    has_more: false
                }
            }
        },
        'POST /projects': {
            status: 201,
            statusText: 'Created',
            data: {
                id: 'proj_9876543210',
                name: 'Mobile App Development',
                description: 'Build iOS and Android mobile applications',
                status: 'active',
                created_at: new Date().toISOString(),
                updated_at: new Date().toISOString(),
                owner: {
                    id: 'user_0987654321',
                    name: 'John Doe',
                    email: 'john@company.com'
                },
                team_id: 'team_1122334455',
                task_count: 0,
                completed_tasks: 0,
                progress: 0.0,
                due_date: '2025-06-01T00:00:00Z',
                tags: ['mobile', 'ios', 'android']
            }
        }
    };

    const key = `${method} ${endpoint}`;
    return responses[key] || {
        status: 404,
        statusText: 'Not Found',
        data: {
            error: {
                code: 'endpoint_not_found',
                message: 'The requested endpoint was not found'
            }
        }
    };
};

// Toast notifications
const showToast = (message, type = 'success') => {
    const toast = elements.toast;
    const toastMessage = toast.querySelector('.toast-message');
    const toastIcon = toast.querySelector('.toast-icon');

    toastMessage.textContent = message;

    if (type === 'success') {
        toast.style.background = 'var(--success)';
        toastIcon.textContent = '✓';
    } else {
        toast.style.background = 'var(--error)';
        toastIcon.textContent = '✕';
    }

    toast.classList.add('show');

    setTimeout(() => {
        toast.classList.remove('show');
    }, 4000);
};

// Get API Key functionality
const setupGetApiKey = () => {
    elements.getApiKeyBtn.addEventListener('click', () => {
        showToast('Redirecting to API key management...', 'success');
        setTimeout(() => {
            // In a real app, this would redirect to the API key management page
            window.location.href = 'login.html';
        }, 2000);
    });
};

// Navbar background on scroll
const setupNavbarScroll = () => {
    window.addEventListener('scroll', () => {
        const navbar = document.querySelector('.navbar');
        if (window.scrollY > 50) {
            navbar.style.background = 'rgba(255, 255, 255, 0.98)';
        } else {
            navbar.style.background = 'rgba(255, 255, 255, 0.95)';
        }
    });
};

// Button click handlers
const setupButtonHandlers = () => {
    document.querySelectorAll('.btn').forEach(btn => {
        btn.addEventListener('click', (e) => {
            const buttonText = btn.textContent.toLowerCase();

            if (buttonText.includes('trial') || buttonText.includes('start')) {
                if (!btn.closest('.api-tester') && !btn.id) {
                    e.preventDefault();
                    showToast('Starting your free trial! Redirecting...', 'success');
                    setTimeout(() => {
                        window.location.href = 'signup.html';
                    }, 2000);
                }
            }
        });
    });
};

// Syntax highlighting for code blocks (simple implementation)
const setupSyntaxHighlighting = () => {
    document.querySelectorAll('pre code').forEach(block => {
        const text = block.textContent;

        // Simple JSON highlighting
        if (text.trim().startsWith('{') || text.trim().startsWith('[')) {
            try {
                const parsed = JSON.parse(text);
                const highlighted = JSON.stringify(parsed, null, 2)
                    .replace(/"([^"]+)":/g, '<span style="color: #8b5cf6;">"$1":</span>')
                    .replace(/: "([^"]+)"/g, ': <span style="color: #10b981;">"$1"</span>')
                    .replace(/: (\d+)/g, ': <span style="color: #f59e0b;">$1</span>')
                    .replace(/: (true|false|null)/g, ': <span style="color: #ef4444;">$1</span>');

                block.innerHTML = highlighted;
            } catch (e) {
                // If JSON parsing fails, leave as is
            }
        }

        // Simple curl command highlighting
        if (text.includes('curl')) {
            const highlighted = text
                .replace(/curl/g, '<span style="color: #8b5cf6;">curl</span>')
                .replace(/-X (GET|POST|PUT|DELETE)/g, '<span style="color: #f59e0b;">-X</span> <span style="color: #10b981;">$1</span>')
                .replace(/-H/g, '<span style="color: #f59e0b;">-H</span>')
                .replace(/-d/g, '<span style="color: #f59e0b;">-d</span>');

            block.innerHTML = highlighted;
        }
    });
};

// Initialize everything
const init = () => {
    setupNavigation();
    setupCodeTabs();
    setupCopyButtons();
    setupApiTester();
    setupGetApiKey();
    setupNavbarScroll();
    setupButtonHandlers();
    setupSyntaxHighlighting();

    // Set first nav item as active initially
    const firstNavItem = document.querySelector('.nav-item');
    if (firstNavItem) {
        firstNavItem.classList.add('active');
    }
};

// Initialize when DOM is loaded
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
} else {
    init();
}

// Export for potential external use
window.TaskFlowAPIDocs = {
    showToast,
    populateApiTester,
    sendApiRequest
};