// TaskTracker app.js — drag-and-drop, detail panel, keyboard shortcuts

(function() {
    'use strict';

    // ========================================
    // Drag-and-Drop (SortableJS)
    // ========================================

    function initKanban() {
        document.querySelectorAll('.kanban-column-body').forEach(function(el) {
            // Destroy existing Sortable instance if re-initializing
            if (el._sortable) {
                el._sortable.destroy();
            }

            el._sortable = new Sortable(el, {
                group: 'kanban',
                animation: 150,
                ghostClass: 'task-card--ghost',
                dragClass: 'task-card--dragging',
                handle: '.task-card',  // Only drag by the card itself
                filter: '.create-task-form',  // Don't drag the create form
                onEnd: function(evt) {
                    var taskId = evt.item.dataset.taskId;
                    var fromStatus = evt.from.dataset.status;
                    var toStatus = evt.to.dataset.status;

                    // No-op if dropped in same column
                    if (fromStatus === toStatus) return;

                    // Determine the handler based on transition
                    var handler = null;
                    if (toStatus === 'Active' && fromStatus === 'Paused') {
                        handler = 'Resume';
                    } else if (toStatus === 'Active') {
                        handler = 'Start';
                    } else if (toStatus === 'Paused' && fromStatus === 'Active') {
                        handler = 'Pause';
                    } else if (toStatus === 'Completed') {
                        handler = 'Complete';
                    } else {
                        // Invalid transition — revert by moving the item back
                        evt.from.appendChild(evt.item);
                        return;
                    }

                    // Fire htmx request to update the task status
                    htmx.ajax('PUT', '/board?handler=' + handler + '&id=' + taskId, {
                        target: '#kanban-board',
                        swap: 'innerHTML'
                    });
                }
            });
        });
    }

    // ========================================
    // Detail Panel helpers
    // ========================================

    // Defined on window so inline onclick handlers and partial scripts can call them.
    // The _TaskDetail partial also defines these inline; whichever loads last wins,
    // but the behavior is identical.

    window.closeDetailPanel = function() {
        var overlay = document.querySelector('.detail-overlay');
        var panel = document.querySelector('.detail-panel');
        if (overlay) overlay.classList.remove('detail-overlay--open');
        if (panel) panel.classList.remove('detail-panel--open');
        // Clear content after CSS transition completes
        setTimeout(function() {
            var container = document.getElementById('detail-panel');
            if (container && !document.querySelector('.detail-panel--open')) {
                container.innerHTML = '';
            }
        }, 300);
    };

    window.startEdit = function(fieldId) {
        var container = document.getElementById('edit-' + fieldId);
        if (!container) return;
        var display = container.querySelector('.inline-edit-display');
        var form = container.querySelector('.inline-edit-form');
        if (display) display.style.display = 'none';
        if (form) {
            form.style.display = '';
            var input = form.querySelector('input, textarea');
            if (input) {
                input.focus();
                if (input.type === 'text' || input.tagName === 'TEXTAREA') {
                    input.setSelectionRange(input.value.length, input.value.length);
                }
            }
        }
    };

    window.cancelEdit = function(fieldId) {
        var container = document.getElementById('edit-' + fieldId);
        if (!container) return;
        var display = container.querySelector('.inline-edit-display');
        var form = container.querySelector('.inline-edit-form');
        if (display) display.style.display = '';
        if (form) form.style.display = 'none';
    };

    // ========================================
    // Initialization
    // ========================================

    // Initialize Kanban drag-and-drop on page load
    document.addEventListener('DOMContentLoaded', function() {
        initKanban();
    });

    // Re-initialize after htmx swaps that affect the kanban board.
    // This is critical because htmx replaces DOM nodes, destroying Sortable instances.
    document.addEventListener('htmx:afterSwap', function(evt) {
        var target = evt.detail.target;
        if (target && (target.id === 'kanban-board' || target.id === 'board-content' || (target.closest && target.closest('#kanban-board')))) {
            initKanban();
        }
    });

    // Also handle htmx:afterSettle for cases where the DOM isn't fully ready on afterSwap
    document.addEventListener('htmx:afterSettle', function(evt) {
        var target = evt.detail.target;
        if (target && (target.id === 'kanban-board' || target.id === 'board-content')) {
            initKanban();
        }
    });

    // Open detail panel when its content is loaded via htmx
    document.addEventListener('htmx:afterSwap', function(evt) {
        if (evt.detail.target && evt.detail.target.id === 'detail-panel') {
            // Panel content was just loaded — trigger open animation
            requestAnimationFrame(function() {
                var overlay = document.querySelector('.detail-overlay');
                var panel = document.querySelector('.detail-panel');
                if (overlay) overlay.classList.add('detail-overlay--open');
                if (panel) panel.classList.add('detail-panel--open');
            });
        }
    });

    // Global Escape key handler for closing the detail panel
    // (Search modal Escape is handled separately with stopPropagation)
    document.addEventListener('keydown', function(e) {
        if (e.key === 'Escape') {
            // Don't close detail panel if search modal handled Escape
            var searchModal = document.getElementById('search-modal');
            if (searchModal && searchModal.classList.contains('search-backdrop--open')) return;

            var panel = document.querySelector('.detail-panel--open');
            if (panel) {
                closeDetailPanel();
                e.preventDefault();
            }
        }
    });

    // ========================================
    // Search Modal (Ctrl+K)
    // ========================================

    var searchSelectedIndex = 0;

    window.openSearch = function() {
        var modal = document.getElementById('search-modal');
        if (!modal) return;
        modal.classList.add('search-backdrop--open');
        var input = document.getElementById('search-input');
        if (input) {
            input.value = '';
            input.focus();
            // Trigger initial load (show recent tasks when empty)
            htmx.trigger(input, 'search');
        }
        searchSelectedIndex = 0;
    };

    window.closeSearch = function() {
        var modal = document.getElementById('search-modal');
        if (modal) modal.classList.remove('search-backdrop--open');
    };

    window.selectSearchResult = function(taskId) {
        closeSearch();
        // Load the task detail panel
        htmx.ajax('GET', '/board?handler=TaskDetail&id=' + taskId, {
            target: '#detail-panel',
            swap: 'innerHTML'
        });
    };

    window.highlightResult = function(el) {
        var results = document.querySelectorAll('.search-result');
        results.forEach(function(r) { r.classList.remove('search-result--selected'); });
        el.classList.add('search-result--selected');
        // Update index
        searchSelectedIndex = Array.from(results).indexOf(el);
    };

    // Keyboard navigation in search
    document.addEventListener('keydown', function(e) {
        var modal = document.getElementById('search-modal');
        if (!modal || !modal.classList.contains('search-backdrop--open')) {
            // Ctrl+K / Cmd+K to open
            if ((e.ctrlKey || e.metaKey) && e.key === 'k') {
                e.preventDefault();
                openSearch();
            }
            return;
        }

        // Modal is open
        if (e.key === 'Escape') {
            e.preventDefault();
            e.stopPropagation();
            closeSearch();
            return;
        }

        var results = document.querySelectorAll('.search-result');
        if (results.length === 0) return;

        if (e.key === 'ArrowDown') {
            e.preventDefault();
            searchSelectedIndex = Math.min(searchSelectedIndex + 1, results.length - 1);
            updateSearchSelection(results);
        } else if (e.key === 'ArrowUp') {
            e.preventDefault();
            searchSelectedIndex = Math.max(searchSelectedIndex - 1, 0);
            updateSearchSelection(results);
        } else if (e.key === 'Enter') {
            e.preventDefault();
            var selected = results[searchSelectedIndex];
            if (selected) {
                var taskId = selected.dataset.taskId;
                selectSearchResult(taskId);
            }
        }
    });

    function updateSearchSelection(results) {
        results.forEach(function(r, i) {
            if (i === searchSelectedIndex) {
                r.classList.add('search-result--selected');
                r.scrollIntoView({ block: 'nearest' });
            } else {
                r.classList.remove('search-result--selected');
            }
        });
    }

    // Reset selection when search results are updated
    document.addEventListener('htmx:afterSwap', function(evt) {
        if (evt.detail.target && evt.detail.target.id === 'search-results') {
            searchSelectedIndex = 0;
        }
    });

})();