/**
 * Advanced Search Functionality
 * Handles complex search queries with date ranges, user filters, and multiple criteria
 */

// Open advanced search modal
function openAdvancedSearch() {
    const modal = document.getElementById('advancedSearchModal');
    if (modal) {
        modal.style.display = 'flex';
        document.body.classList.add('modal-open');
        loadUsersForSearch();
        populateCurrentFilters();
        loadSavedFilters();
    }
}

// Close advanced search modal
function closeAdvancedSearch() {
    const modal = document.getElementById('advancedSearchModal');
    if (modal) {
        modal.style.display = 'none';
        document.body.classList.remove('modal-open');
    }
}

// Close modal when clicking on backdrop
function closeOnAdvancedSearchBackdropClick(event) {
    const modal = document.getElementById('advancedSearchModal');
    if (event.target === modal) {
        closeAdvancedSearch();
    }
}

// Load users for dropdown
async function loadUsersForSearch() {
    try {
        const response = await fetch('/api/get_users.php', {
            credentials: 'same-origin'
        });
        const data = await response.json();

        if (data.success && data.users) {
            const createdBySelect = document.getElementById('adv-created-by');
            const assignedToSelect = document.getElementById('adv-assigned-to');

            // Clear existing options (except first default option)
            while (createdBySelect.options.length > 1) {
                createdBySelect.remove(1);
            }
            while (assignedToSelect.options.length > 2) { // Keep "Any" and "Unassigned"
                assignedToSelect.remove(2);
            }

            // Add users to both dropdowns
            data.users.forEach(user => {
                const displayName = user.display_name || user.username;

                const option1 = document.createElement('option');
                option1.value = user.user_id;
                option1.textContent = displayName;
                createdBySelect.appendChild(option1);

                const option2 = document.createElement('option');
                option2.value = user.user_id;
                option2.textContent = displayName;
                assignedToSelect.appendChild(option2);
            });
        }
    } catch (error) {
        console.error('Error loading users:', error);
    }
}

// Populate form with current URL parameters
function populateCurrentFilters() {
    const urlParams = new URLSearchParams(window.location.search);

    // Search text
    if (urlParams.has('search')) {
        document.getElementById('adv-search-text').value = urlParams.get('search');
    }

    // Status
    if (urlParams.has('status')) {
        const statuses = urlParams.get('status').split(',');
        const statusSelect = document.getElementById('adv-status');
        Array.from(statusSelect.options).forEach(option => {
            option.selected = statuses.includes(option.value);
        });
    }
}

// Perform advanced search
function performAdvancedSearch(event) {
    event.preventDefault();

    const params = new URLSearchParams();

    // Search text
    const searchText = document.getElementById('adv-search-text').value.trim();
    if (searchText) {
        params.set('search', searchText);
    }

    // Date ranges
    const createdFrom = document.getElementById('adv-created-from').value;
    const createdTo = document.getElementById('adv-created-to').value;
    const updatedFrom = document.getElementById('adv-updated-from').value;
    const updatedTo = document.getElementById('adv-updated-to').value;

    if (createdFrom) params.set('created_from', createdFrom);
    if (createdTo) params.set('created_to', createdTo);
    if (updatedFrom) params.set('updated_from', updatedFrom);
    if (updatedTo) params.set('updated_to', updatedTo);

    // Status (multi-select)
    const statusSelect = document.getElementById('adv-status');
    const selectedStatuses = Array.from(statusSelect.selectedOptions).map(opt => opt.value);
    if (selectedStatuses.length > 0) {
        params.set('status', selectedStatuses.join(','));
    }

    // Priority range
    const priorityMin = document.getElementById('adv-priority-min').value;
    const priorityMax = document.getElementById('adv-priority-max').value;
    if (priorityMin) params.set('priority_min', priorityMin);
    if (priorityMax) params.set('priority_max', priorityMax);

    // Users
    const createdBy = document.getElementById('adv-created-by').value;
    const assignedTo = document.getElementById('adv-assigned-to').value;
    if (createdBy) params.set('created_by', createdBy);
    if (assignedTo) params.set('assigned_to', assignedTo);

    // Redirect to dashboard with params
    window.location.href = '/?' + params.toString();
}

// Reset advanced search form
function resetAdvancedSearch() {
    document.getElementById('advancedSearchForm').reset();

    // Unselect all multi-select options
    const statusSelect = document.getElementById('adv-status');
    Array.from(statusSelect.options).forEach(option => {
        option.selected = false;
    });
}

// Save current search as a filter
async function saveCurrentFilter() {
    showInputModal(
        'Save Search Filter',
        'Enter a name for this filter:',
        'My Filter',
        async (filterName) => {
            if (!filterName || filterName.trim() === '') {
                toast.warning('Filter name cannot be empty', 2000);
                return;
            }

            const filterCriteria = getCurrentFilterCriteria();

            try {
                const response = await fetch('/api/saved_filters.php', {
                    method: 'POST',
                    credentials: 'same-origin',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRF-Token': window.CSRF_TOKEN
                    },
                    body: JSON.stringify({
                        filter_name: filterName.trim(),
                        filter_criteria: filterCriteria
                    })
                });

                const result = await response.json();

                if (result.success) {
                    toast.success(`Filter "${filterName}" saved successfully!`, 3000);
                    loadSavedFilters();
                } else {
                    toast.error('Failed to save filter: ' + (result.error || 'Unknown error'), 4000);
                }
            } catch (error) {
                console.error('Error saving filter:', error);
                toast.error('Error saving filter', 4000);
            }
        }
    );
}

// Get current filter criteria from form
function getCurrentFilterCriteria() {
    const criteria = {};

    const searchText = document.getElementById('adv-search-text').value.trim();
    if (searchText) criteria.search = searchText;

    const createdFrom = document.getElementById('adv-created-from').value;
    if (createdFrom) criteria.created_from = createdFrom;

    const createdTo = document.getElementById('adv-created-to').value;
    if (createdTo) criteria.created_to = createdTo;

    const updatedFrom = document.getElementById('adv-updated-from').value;
    if (updatedFrom) criteria.updated_from = updatedFrom;

    const updatedTo = document.getElementById('adv-updated-to').value;
    if (updatedTo) criteria.updated_to = updatedTo;

    const statusSelect = document.getElementById('adv-status');
    const selectedStatuses = Array.from(statusSelect.selectedOptions).map(opt => opt.value);
    if (selectedStatuses.length > 0) criteria.status = selectedStatuses.join(',');

    const priorityMin = document.getElementById('adv-priority-min').value;
    if (priorityMin) criteria.priority_min = priorityMin;

    const priorityMax = document.getElementById('adv-priority-max').value;
    if (priorityMax) criteria.priority_max = priorityMax;

    const createdBy = document.getElementById('adv-created-by').value;
    if (createdBy) criteria.created_by = createdBy;

    const assignedTo = document.getElementById('adv-assigned-to').value;
    if (assignedTo) criteria.assigned_to = assignedTo;

    return criteria;
}

// Load saved filters
async function loadSavedFilters() {
    try {
        const response = await fetch('/api/saved_filters.php', {
            credentials: 'same-origin'
        });
        const data = await response.json();

        if (data.success && data.filters) {
            populateSavedFiltersDropdown(data.filters);
        }
    } catch (error) {
        console.error('Error loading saved filters:', error);
    }
}

// Populate saved filters dropdown
function populateSavedFiltersDropdown(filters) {
    const dropdown = document.getElementById('saved-filters-select');
    if (!dropdown) return;

    // Clear existing options except the first (placeholder)
    while (dropdown.options.length > 1) {
        dropdown.remove(1);
    }

    // Add saved filters
    filters.forEach(filter => {
        const option = document.createElement('option');
        option.value = filter.filter_id;
        option.textContent = filter.filter_name + (filter.is_default ? ' ⭐' : '');
        option.dataset.criteria = JSON.stringify(filter.filter_criteria);
        dropdown.appendChild(option);
    });
}

// Load a saved filter
function loadSavedFilter() {
    const dropdown = document.getElementById('saved-filters-select');
    const selectedOption = dropdown.options[dropdown.selectedIndex];

    if (!selectedOption || !selectedOption.dataset.criteria) return;

    try {
        const criteria = JSON.parse(selectedOption.dataset.criteria);
        applySavedFilterCriteria(criteria);
    } catch (error) {
        console.error('Error loading filter:', error);
    }
}

// Apply saved filter criteria to form
function applySavedFilterCriteria(criteria) {
    // Search text
    document.getElementById('adv-search-text').value = criteria.search || '';

    // Date ranges
    document.getElementById('adv-created-from').value = criteria.created_from || '';
    document.getElementById('adv-created-to').value = criteria.created_to || '';
    document.getElementById('adv-updated-from').value = criteria.updated_from || '';
    document.getElementById('adv-updated-to').value = criteria.updated_to || '';

    // Status
    const statusSelect = document.getElementById('adv-status');
    const statuses = criteria.status ? criteria.status.split(',') : [];
    Array.from(statusSelect.options).forEach(option => {
        option.selected = statuses.includes(option.value);
    });

    // Priority
    document.getElementById('adv-priority-min').value = criteria.priority_min || '';
    document.getElementById('adv-priority-max').value = criteria.priority_max || '';

    // Users
    document.getElementById('adv-created-by').value = criteria.created_by || '';
    document.getElementById('adv-assigned-to').value = criteria.assigned_to || '';
}

// Delete saved filter
async function deleteSavedFilter() {
    const dropdown = document.getElementById('saved-filters-select');
    const selectedOption = dropdown.options[dropdown.selectedIndex];

    if (!selectedOption || selectedOption.value === '') {
        if (typeof toast !== 'undefined') {
            toast.error('Please select a filter to delete');
        }
        return;
    }

    const filterId = selectedOption.value;
    const filterName = selectedOption.textContent;

    showConfirmModal(
        `Delete Filter "${filterName}"?`,
        'This action cannot be undone.',
        'error',
        async () => {
            try {
                const response = await fetch('/api/saved_filters.php', {
                    method: 'DELETE',
                    credentials: 'same-origin',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRF-Token': window.CSRF_TOKEN
                    },
                    body: JSON.stringify({ filter_id: filterId })
                });

                const result = await response.json();

                if (result.success) {
                    toast.success('Filter deleted successfully', 3000);
                    loadSavedFilters();
                    resetAdvancedSearch();
                } else {
                    toast.error('Failed to delete filter', 4000);
                }
            } catch (error) {
                console.error('Error deleting filter:', error);
                toast.error('Error deleting filter', 4000);
            }
        }
    );
}

// Keyboard shortcut (Ctrl+Shift+F)
document.addEventListener('keydown', (e) => {
    if (e.ctrlKey && e.shiftKey && e.key === 'F') {
        e.preventDefault();
        openAdvancedSearch();
    }

    // ESC to close
    if (e.key === 'Escape') {
        const modal = document.getElementById('advancedSearchModal');
        if (modal && modal.style.display === 'flex') {
            closeAdvancedSearch();
        }
    }
});