document.addEventListener('DOMContentLoaded', () => {
    const toastEl = document.getElementById('appToast');
    if (toastEl && window.bootstrap) {
        const toast = new bootstrap.Toast(toastEl);
        toast.show();
    }

    document.querySelectorAll('.needs-validation').forEach((form) => {
        form.addEventListener('submit', (event) => {
            if (!form.checkValidity()) {
                event.preventDefault();
                event.stopPropagation();
            }
            form.classList.add('was-validated');
        });
    });

    const activeItem = document.querySelector('.task-item-active');
    if (activeItem && window.innerWidth < 1200) {
        activeItem.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
    }

    const taskList = document.querySelector('.task-list');
    const detailContent = document.getElementById('taskDetailContent');

    if (!taskList || !detailContent) {
        return;
    }

    const detailPriorityBadge = document.getElementById('detailPriorityBadge');
    const detailStatusBadge = document.getElementById('detailStatusBadge');
    const detailTitle = document.getElementById('detailTitle');
    const detailDescription = document.getElementById('detailDescription');
    const detailCreated = document.getElementById('detailCreated');
    const detailUpdated = document.getElementById('detailUpdated');
    const detailCompleted = document.getElementById('detailCompleted');
    const detailEditLink = document.getElementById('detailEditLink');
    const detailToggleTaskId = document.getElementById('detailToggleTaskId');
    const detailDeleteTaskId = document.getElementById('detailDeleteTaskId');
    const detailToggleIcon = document.getElementById('detailToggleIcon');
    const detailToggleText = document.getElementById('detailToggleText');
    const taskEditorForm = document.getElementById('taskEditorForm');
    const taskFormAction = document.getElementById('taskFormAction');
    const taskFormTaskId = document.getElementById('taskFormTaskId');
    const taskFormSelectedTask = document.getElementById('taskFormSelectedTask');
    const taskFormTitle = document.getElementById('taskFormTitle');
    const taskFormEyebrow = document.getElementById('taskFormEyebrow');
    const taskFormCancelLink = document.getElementById('taskFormCancelLink');
    const taskTitleInput = document.getElementById('title');
    const taskDescriptionInput = document.getElementById('description');
    const taskPriorityInput = document.getElementById('priority');
    const isEditingMode = taskEditorForm?.dataset.formMode === 'update';

    const syncActiveState = (selectedItem) => {
        document.querySelectorAll('.task-item').forEach((item) => {
            const isActive = item === selectedItem;
            item.classList.toggle('task-item-active', isActive);
            item.setAttribute('aria-pressed', isActive ? 'true' : 'false');
        });
    };

    const syncEditForm = (taskItem) => {
        if (!isEditingMode || !taskItem) {
            return;
        }

        if (taskFormAction) {
            taskFormAction.value = 'update';
        }

        if (taskFormTaskId) {
            taskFormTaskId.value = taskItem.dataset.taskId || '';
        }

        if (taskFormSelectedTask) {
            taskFormSelectedTask.value = taskItem.dataset.taskId || '';
        }

        if (taskTitleInput) {
            taskTitleInput.value = taskItem.dataset.taskTitle || '';
        }

        if (taskDescriptionInput) {
            taskDescriptionInput.value = taskItem.dataset.taskDescriptionRaw || '';
        }

        if (taskPriorityInput) {
            taskPriorityInput.value = taskItem.dataset.taskPriorityValue || 'medium';
        }

        if (taskFormTitle) {
            taskFormTitle.textContent = 'Обновить задачу';
        }

        if (taskFormEyebrow) {
            taskFormEyebrow.textContent = 'Редактирование';
        }

        if (taskFormCancelLink) {
            const cancelUrl = new URL(taskItem.dataset.taskEditUrl || 'index.php', window.location.origin);
            cancelUrl.searchParams.delete('edit');
            taskFormCancelLink.href = `${cancelUrl.pathname}${cancelUrl.search}${cancelUrl.hash}`;
        }
    };

    const updateHistory = (taskId) => {
        const url = new URL(window.location.href);
        url.searchParams.set('task', taskId);

        if (isEditingMode) {
            url.searchParams.set('edit', taskId);
        } else {
            url.searchParams.delete('edit');
        }

        history.replaceState({ taskId }, '', url);
    };

    const selectTask = (taskItem, shouldSyncHistory = true) => {
        if (!taskItem) {
            return;
        }

        syncActiveState(taskItem);
        detailContent.dataset.selectedTaskId = taskItem.dataset.taskId || '';

        if (detailPriorityBadge) {
            detailPriorityBadge.className = `priority-badge ${taskItem.dataset.taskPriorityClass || ''}`.trim();
            detailPriorityBadge.textContent = taskItem.dataset.taskPriorityLabel || '';
        }

        if (detailStatusBadge) {
            detailStatusBadge.className = `status-badge ${taskItem.dataset.taskStatusClass || ''}`.trim();
            detailStatusBadge.textContent = taskItem.dataset.taskStatusLabel || '';
        }

        if (detailTitle) {
            detailTitle.textContent = taskItem.dataset.taskTitle || '';
        }

        if (detailDescription) {
            detailDescription.textContent = taskItem.dataset.taskDescription || '';
        }

        if (detailCreated) {
            detailCreated.textContent = taskItem.dataset.taskCreatedLabel || '';
        }

        if (detailUpdated) {
            detailUpdated.textContent = taskItem.dataset.taskUpdatedLabel || '';
        }

        if (detailCompleted) {
            detailCompleted.textContent = taskItem.dataset.taskCompletedLabel || '';
        }

        if (detailEditLink) {
            detailEditLink.href = taskItem.dataset.taskEditUrl || 'index.php';
        }

        if (detailToggleTaskId) {
            detailToggleTaskId.value = taskItem.dataset.taskId || '';
        }

        if (detailDeleteTaskId) {
            detailDeleteTaskId.value = taskItem.dataset.taskId || '';
        }

        if (detailToggleIcon) {
            detailToggleIcon.className = `bi ${taskItem.dataset.taskToggleIcon || 'bi-check2'} me-2`;
        }

        if (detailToggleText) {
            detailToggleText.textContent = taskItem.dataset.taskToggleLabel || 'Отметить выполненной';
        }

        syncEditForm(taskItem);

        if (shouldSyncHistory && taskItem.dataset.taskId) {
            updateHistory(taskItem.dataset.taskId);
        }
    };

    taskList.addEventListener('click', (event) => {
        const taskItem = event.target.closest('.task-item');
        if (!taskItem) {
            return;
        }

        if (event.target.closest('form') || event.target.closest('[data-bs-toggle="dropdown"]') || event.target.closest('.dropdown-item-edit')) {
            return;
        }

        if (event.target.closest('.dropdown-menu') && !event.target.closest('.task-open-link')) {
            return;
        }

        const clickedLink = event.target.closest('a');
        if (clickedLink && !event.target.closest('.task-open-link')) {
            return;
        }

        event.preventDefault();
        selectTask(taskItem);
    });

    taskList.addEventListener('keydown', (event) => {
        const taskItem = event.target.closest('.task-item');
        if (!taskItem || event.target !== taskItem) {
            return;
        }

        if (event.key !== 'Enter' && event.key !== ' ') {
            return;
        }

        event.preventDefault();
        selectTask(taskItem);
    });

    window.addEventListener('popstate', () => {
        const taskId = new URL(window.location.href).searchParams.get('task');
        if (!taskId) {
            return;
        }

        const matchingItem = document.querySelector(`.task-item[data-task-id="${CSS.escape(taskId)}"]`);
        if (matchingItem) {
            selectTask(matchingItem, false);
        }
    });
});