/**
 * WP BnB Frontend JavaScript
 *
 * Handles search forms, calendar widgets, and interactive elements.
 *
 * @package Magdev\WpBnb
 */

(function() {
	'use strict';

	/**
	 * WP BnB Frontend namespace.
	 */
	const WpBnb = {

		/**
		 * Configuration from localized script.
		 */
		config: window.wpBnbFrontend || {},

		/**
		 * Initialize all frontend components.
		 */
		init: function() {
			this.initSearchForms();
			this.initCalendarWidgets();
			this.initAvailabilityForms();
			this.initPriceCalculators();
		},

		/**
		 * Initialize room search forms.
		 */
		initSearchForms: function() {
			const forms = document.querySelectorAll('.wp-bnb-search-form');
			forms.forEach(form => {
				new SearchForm(form);
			});
		},

		/**
		 * Initialize calendar widgets.
		 */
		initCalendarWidgets: function() {
			const calendars = document.querySelectorAll('.wp-bnb-availability-calendar-widget');
			calendars.forEach(calendar => {
				new CalendarWidget(calendar);
			});
		},

		/**
		 * Initialize availability check forms on single room pages.
		 */
		initAvailabilityForms: function() {
			const forms = document.querySelectorAll('.wp-bnb-availability-check');
			forms.forEach(form => {
				new AvailabilityForm(form);
			});
		},

		/**
		 * Initialize price calculator forms.
		 */
		initPriceCalculators: function() {
			const calculators = document.querySelectorAll('.wp-bnb-price-calculator');
			calculators.forEach(calculator => {
				new PriceCalculator(calculator);
			});
		},

		/**
		 * Make an AJAX request.
		 *
		 * @param {string} action The AJAX action.
		 * @param {Object} data The request data.
		 * @return {Promise} Promise resolving to response data.
		 */
		ajax: function(action, data = {}) {
			const formData = new FormData();
			formData.append('action', action);
			formData.append('nonce', this.config.nonce || '');

			Object.keys(data).forEach(key => {
				if (data[key] !== null && data[key] !== undefined) {
					formData.append(key, data[key]);
				}
			});

			return fetch(this.config.ajaxUrl || '/wp-admin/admin-ajax.php', {
				method: 'POST',
				body: formData,
				credentials: 'same-origin'
			})
			.then(response => {
				if (!response.ok) {
					throw new Error('Network response was not ok');
				}
				return response.json();
			})
			.then(data => {
				if (!data.success) {
					throw new Error(data.data?.message || 'Request failed');
				}
				return data.data;
			});
		},

		/**
		 * Format a date as YYYY-MM-DD.
		 *
		 * @param {Date} date The date object.
		 * @return {string} Formatted date string.
		 */
		formatDate: function(date) {
			const year = date.getFullYear();
			const month = String(date.getMonth() + 1).padStart(2, '0');
			const day = String(date.getDate()).padStart(2, '0');
			return `${year}-${month}-${day}`;
		},

		/**
		 * Parse a date string.
		 *
		 * @param {string} dateStr Date string in YYYY-MM-DD format.
		 * @return {Date|null} Date object or null if invalid.
		 */
		parseDate: function(dateStr) {
			if (!dateStr) return null;
			const parts = dateStr.split('-');
			if (parts.length !== 3) return null;
			return new Date(parseInt(parts[0]), parseInt(parts[1]) - 1, parseInt(parts[2]));
		},

		/**
		 * Calculate nights between two dates.
		 *
		 * @param {Date} checkIn Check-in date.
		 * @param {Date} checkOut Check-out date.
		 * @return {number} Number of nights.
		 */
		calculateNights: function(checkIn, checkOut) {
			if (!checkIn || !checkOut) return 0;
			const diffTime = checkOut.getTime() - checkIn.getTime();
			return Math.ceil(diffTime / (1000 * 60 * 60 * 24));
		},

		/**
		 * Debounce a function.
		 *
		 * @param {Function} func The function to debounce.
		 * @param {number} wait Wait time in milliseconds.
		 * @return {Function} Debounced function.
		 */
		debounce: function(func, wait) {
			let timeout;
			return function executedFunction(...args) {
				const later = () => {
					clearTimeout(timeout);
					func(...args);
				};
				clearTimeout(timeout);
				timeout = setTimeout(later, wait);
			};
		}
	};

	/**
	 * Search Form handler class.
	 */
	class SearchForm {
		constructor(element) {
			this.form = element;
			this.resultsContainer = document.querySelector(
				this.form.dataset.results || '.wp-bnb-search-results'
			);
			this.currentPage = 1;
			this.isLoading = false;

			this.bindEvents();
		}

		bindEvents() {
			// Form submission.
			this.form.addEventListener('submit', (e) => {
				e.preventDefault();
				this.currentPage = 1;
				this.search();
			});

			// Date validation.
			const checkIn = this.form.querySelector('[name="check_in"]');
			const checkOut = this.form.querySelector('[name="check_out"]');

			if (checkIn && checkOut) {
				// Set min date to today.
				const today = WpBnb.formatDate(new Date());
				checkIn.setAttribute('min', today);

				checkIn.addEventListener('change', () => {
					if (checkIn.value) {
						// Set check-out min to day after check-in.
						const minCheckOut = WpBnb.parseDate(checkIn.value);
						if (minCheckOut) {
							minCheckOut.setDate(minCheckOut.getDate() + 1);
							checkOut.setAttribute('min', WpBnb.formatDate(minCheckOut));

							// Clear check-out if it's before new minimum.
							if (checkOut.value && checkOut.value <= checkIn.value) {
								checkOut.value = '';
							}
						}
					}
				});

				checkOut.addEventListener('change', () => {
					if (checkOut.value && checkIn.value && checkOut.value <= checkIn.value) {
						alert(WpBnb.config.i18n?.invalidDateRange || 'Check-out must be after check-in');
						checkOut.value = '';
					}
				});
			}

			// Reset button.
			const resetBtn = this.form.querySelector('[type="reset"]');
			if (resetBtn) {
				resetBtn.addEventListener('click', () => {
					setTimeout(() => {
						this.clearResults();
					}, 0);
				});
			}

			// Load more button.
			if (this.resultsContainer) {
				this.resultsContainer.addEventListener('click', (e) => {
					if (e.target.classList.contains('wp-bnb-load-more')) {
						e.preventDefault();
						this.loadMore();
					}
				});
			}
		}

		getFormData() {
			const formData = new FormData(this.form);
			const data = {};

			formData.forEach((value, key) => {
				if (value) {
					// Handle array fields (amenities[]).
					if (key.endsWith('[]')) {
						const cleanKey = key.slice(0, -2);
						if (!data[cleanKey]) {
							data[cleanKey] = [];
						}
						data[cleanKey].push(value);
					} else {
						data[key] = value;
					}
				}
			});

			// Convert arrays to comma-separated strings for AJAX.
			Object.keys(data).forEach(key => {
				if (Array.isArray(data[key])) {
					data[key] = data[key].join(',');
				}
			});

			return data;
		}

		search() {
			if (this.isLoading) return;

			this.isLoading = true;
			this.showLoading();

			const data = this.getFormData();
			data.page = this.currentPage;
			data.per_page = this.form.dataset.perPage || 12;

			WpBnb.ajax('wp_bnb_search_rooms', data)
				.then(response => {
					this.renderResults(response, this.currentPage === 1);
				})
				.catch(error => {
					this.showError(error.message);
				})
				.finally(() => {
					this.isLoading = false;
					this.hideLoading();
				});
		}

		loadMore() {
			this.currentPage++;
			this.search();
		}

		renderResults(response, replace = true) {
			if (!this.resultsContainer) return;

			const { rooms, total, page, total_pages } = response;

			if (replace) {
				this.resultsContainer.innerHTML = '';
			} else {
				// Remove existing load more button.
				const existingLoadMore = this.resultsContainer.querySelector('.wp-bnb-load-more-wrapper');
				if (existingLoadMore) {
					existingLoadMore.remove();
				}
			}

			if (rooms.length === 0 && replace) {
				this.resultsContainer.innerHTML = `
					<div class="wp-bnb-no-results">
						<p>${WpBnb.config.i18n?.noResults || 'No rooms found matching your criteria.'}</p>
					</div>
				`;
				return;
			}

			// Create results count.
			if (replace) {
				const countEl = document.createElement('div');
				countEl.className = 'wp-bnb-results-count';
				countEl.innerHTML = `<p>${WpBnb.config.i18n?.resultsFound?.replace('%d', total) || `${total} rooms found`}</p>`;
				this.resultsContainer.appendChild(countEl);
			}

			// Create grid container.
			let grid = this.resultsContainer.querySelector('.wp-bnb-rooms-grid');
			if (!grid) {
				grid = document.createElement('div');
				grid.className = 'wp-bnb-rooms-grid wp-bnb-grid wp-bnb-grid-3';
				this.resultsContainer.appendChild(grid);
			}

			// Render room cards.
			rooms.forEach(room => {
				const card = this.createRoomCard(room);
				grid.appendChild(card);
			});

			// Add load more button if there are more pages.
			if (page < total_pages) {
				const loadMoreWrapper = document.createElement('div');
				loadMoreWrapper.className = 'wp-bnb-load-more-wrapper';
				loadMoreWrapper.innerHTML = `
					<button type="button" class="wp-bnb-load-more wp-bnb-button">
						${WpBnb.config.i18n?.loadMore || 'Load More'}
					</button>
				`;
				this.resultsContainer.appendChild(loadMoreWrapper);
			}
		}

		createRoomCard(room) {
			const card = document.createElement('article');
			card.className = 'wp-bnb-room-card';

			let imageHtml = '';
			if (room.thumbnail) {
				imageHtml = `
					<div class="wp-bnb-room-card-image">
						<a href="${this.escapeHtml(room.permalink)}">
							<img src="${this.escapeHtml(room.thumbnail)}" alt="${this.escapeHtml(room.title)}">
						</a>
					</div>
				`;
			}

			let amenitiesHtml = '';
			if (room.amenities && room.amenities.length > 0) {
				const amenityItems = room.amenities.slice(0, 4).map(a =>
					`<span class="wp-bnb-amenity-tag">${this.escapeHtml(a.name)}</span>`
				).join('');
				amenitiesHtml = `<div class="wp-bnb-room-card-amenities">${amenityItems}</div>`;
			}

			let priceHtml = '';
			if (room.price_display) {
				priceHtml = `
					<div class="wp-bnb-room-card-price">
						<span class="wp-bnb-price">${this.escapeHtml(room.price_display)}</span>
						<span class="wp-bnb-price-unit">/ ${WpBnb.config.i18n?.perNight || 'night'}</span>
					</div>
				`;
			}

			card.innerHTML = `
				${imageHtml}
				<div class="wp-bnb-room-card-content">
					<h3 class="wp-bnb-room-card-title">
						<a href="${this.escapeHtml(room.permalink)}">${this.escapeHtml(room.title)}</a>
					</h3>
					${room.building_name ? `<p class="wp-bnb-room-card-building">${this.escapeHtml(room.building_name)}</p>` : ''}
					<div class="wp-bnb-room-card-meta">
						${room.capacity ? `<span class="wp-bnb-capacity">${room.capacity} ${WpBnb.config.i18n?.guests || 'guests'}</span>` : ''}
						${room.room_type ? `<span class="wp-bnb-room-type">${this.escapeHtml(room.room_type)}</span>` : ''}
					</div>
					${amenitiesHtml}
					${priceHtml}
					<a href="${this.escapeHtml(room.permalink)}" class="wp-bnb-room-card-link wp-bnb-button wp-bnb-button-small">
						${WpBnb.config.i18n?.viewDetails || 'View Details'}
					</a>
				</div>
			`;

			return card;
		}

		escapeHtml(str) {
			if (!str) return '';
			const div = document.createElement('div');
			div.textContent = str;
			return div.innerHTML;
		}

		showLoading() {
			this.form.classList.add('wp-bnb-loading');
			const submitBtn = this.form.querySelector('[type="submit"]');
			if (submitBtn) {
				submitBtn.disabled = true;
				submitBtn.dataset.originalText = submitBtn.textContent;
				submitBtn.textContent = WpBnb.config.i18n?.searching || 'Searching...';
			}
		}

		hideLoading() {
			this.form.classList.remove('wp-bnb-loading');
			const submitBtn = this.form.querySelector('[type="submit"]');
			if (submitBtn) {
				submitBtn.disabled = false;
				if (submitBtn.dataset.originalText) {
					submitBtn.textContent = submitBtn.dataset.originalText;
				}
			}
		}

		showError(message) {
			if (!this.resultsContainer) return;
			this.resultsContainer.innerHTML = `
				<div class="wp-bnb-error">
					<p>${this.escapeHtml(message)}</p>
				</div>
			`;
		}

		clearResults() {
			if (this.resultsContainer) {
				this.resultsContainer.innerHTML = '';
			}
		}
	}

	/**
	 * Calendar Widget handler class.
	 */
	class CalendarWidget {
		constructor(element) {
			this.container = element;
			this.roomId = element.dataset.roomId;
			this.currentYear = parseInt(element.querySelector('[data-year]')?.dataset.year) || new Date().getFullYear();
			this.currentMonth = parseInt(element.querySelector('[data-month]')?.dataset.month) || (new Date().getMonth() + 1);

			this.bindEvents();
		}

		bindEvents() {
			// Navigation buttons.
			this.container.addEventListener('click', (e) => {
				const navBtn = e.target.closest('.wp-bnb-calendar-nav');
				if (navBtn) {
					e.preventDefault();
					const direction = navBtn.dataset.direction;
					if (direction === 'prev') {
						this.navigatePrev();
					} else if (direction === 'next') {
						this.navigateNext();
					}
				}
			});
		}

		navigatePrev() {
			this.currentMonth--;
			if (this.currentMonth < 1) {
				this.currentMonth = 12;
				this.currentYear--;
			}
			this.loadCalendar();
		}

		navigateNext() {
			this.currentMonth++;
			if (this.currentMonth > 12) {
				this.currentMonth = 1;
				this.currentYear++;
			}
			this.loadCalendar();
		}

		loadCalendar() {
			this.container.classList.add('wp-bnb-loading');

			WpBnb.ajax('wp_bnb_get_calendar', {
				room_id: this.roomId,
				year: this.currentYear,
				month: this.currentMonth
			})
			.then(response => {
				this.renderCalendar(response);
			})
			.catch(error => {
				console.error('Calendar load error:', error);
			})
			.finally(() => {
				this.container.classList.remove('wp-bnb-loading');
			});
		}

		renderCalendar(data) {
			const monthContainer = this.container.querySelector('.wp-bnb-calendar-month');
			if (!monthContainer) return;

			// Update month/year attributes.
			monthContainer.dataset.year = this.currentYear;
			monthContainer.dataset.month = this.currentMonth;

			// Update month name.
			const monthNameEl = monthContainer.querySelector('.wp-bnb-calendar-month-name');
			if (monthNameEl) {
				monthNameEl.textContent = `${data.month_name} ${this.currentYear}`;
			}

			// Rebuild calendar grid.
			const tbody = monthContainer.querySelector('.wp-bnb-calendar-grid tbody');
			if (!tbody) return;

			tbody.innerHTML = '';

			let day = 1;
			const totalDays = data.days_in_month;
			const firstDay = data.first_day_of_week;
			const weeks = Math.ceil((firstDay + totalDays) / 7);

			for (let week = 0; week < weeks; week++) {
				const tr = document.createElement('tr');

				for (let dow = 0; dow < 7; dow++) {
					const td = document.createElement('td');
					const cellIndex = week * 7 + dow;

					if (cellIndex < firstDay || day > totalDays) {
						td.className = 'wp-bnb-calendar-empty';
					} else {
						const dayData = data.days[day];
						const classes = ['wp-bnb-calendar-day'];

						if (dayData) {
							if (dayData.is_booked) {
								classes.push('wp-bnb-booked');
							} else {
								classes.push('wp-bnb-available');
							}
							if (dayData.is_past) {
								classes.push('wp-bnb-past');
							}
							if (dayData.is_today) {
								classes.push('wp-bnb-today');
							}
							td.dataset.date = dayData.date || '';
						}

						td.className = classes.join(' ');
						td.textContent = day;
						day++;
					}

					tr.appendChild(td);
				}

				tbody.appendChild(tr);
			}
		}
	}

	/**
	 * Availability Form handler class.
	 * For checking availability on single room pages.
	 */
	class AvailabilityForm {
		constructor(element) {
			this.form = element;
			this.roomId = element.dataset.roomId;
			this.resultContainer = element.querySelector('.wp-bnb-availability-result');

			this.bindEvents();
		}

		bindEvents() {
			this.form.addEventListener('submit', (e) => {
				e.preventDefault();
				this.checkAvailability();
			});

			// Date validation.
			const checkIn = this.form.querySelector('[name="check_in"]');
			const checkOut = this.form.querySelector('[name="check_out"]');

			if (checkIn && checkOut) {
				const today = WpBnb.formatDate(new Date());
				checkIn.setAttribute('min', today);

				checkIn.addEventListener('change', () => {
					if (checkIn.value) {
						const minCheckOut = WpBnb.parseDate(checkIn.value);
						if (minCheckOut) {
							minCheckOut.setDate(minCheckOut.getDate() + 1);
							checkOut.setAttribute('min', WpBnb.formatDate(minCheckOut));
						}
					}
					this.clearResult();
				});

				checkOut.addEventListener('change', () => {
					this.clearResult();
				});
			}
		}

		checkAvailability() {
			const checkIn = this.form.querySelector('[name="check_in"]')?.value;
			const checkOut = this.form.querySelector('[name="check_out"]')?.value;

			if (!checkIn || !checkOut) {
				this.showResult('error', WpBnb.config.i18n?.selectDates || 'Please select check-in and check-out dates.');
				return;
			}

			if (checkOut <= checkIn) {
				this.showResult('error', WpBnb.config.i18n?.invalidDateRange || 'Check-out must be after check-in.');
				return;
			}

			this.form.classList.add('wp-bnb-loading');

			WpBnb.ajax('wp_bnb_get_availability', {
				room_id: this.roomId,
				check_in: checkIn,
				check_out: checkOut
			})
			.then(response => {
				if (response.available) {
					let message = WpBnb.config.i18n?.available || 'Room is available!';
					if (response.price_display) {
						message += ` ${WpBnb.config.i18n?.totalPrice || 'Total'}: ${response.price_display}`;
					}
					this.showResult('success', message, response);
				} else {
					this.showResult('error', WpBnb.config.i18n?.notAvailable || 'Sorry, the room is not available for these dates.');
				}
			})
			.catch(error => {
				this.showResult('error', error.message);
			})
			.finally(() => {
				this.form.classList.remove('wp-bnb-loading');
			});
		}

		showResult(type, message, data = null) {
			if (!this.resultContainer) return;

			let html = `<div class="wp-bnb-availability-${type}">${this.escapeHtml(message)}</div>`;

			if (type === 'success' && data && data.booking_url) {
				html += `
					<a href="${this.escapeHtml(data.booking_url)}" class="wp-bnb-button wp-bnb-book-now">
						${WpBnb.config.i18n?.bookNow || 'Book Now'}
					</a>
				`;
			}

			this.resultContainer.innerHTML = html;
			this.resultContainer.style.display = 'block';
		}

		clearResult() {
			if (this.resultContainer) {
				this.resultContainer.innerHTML = '';
				this.resultContainer.style.display = 'none';
			}
		}

		escapeHtml(str) {
			if (!str) return '';
			const div = document.createElement('div');
			div.textContent = str;
			return div.innerHTML;
		}
	}

	/**
	 * Price Calculator handler class.
	 */
	class PriceCalculator {
		constructor(element) {
			this.container = element;
			this.roomId = element.dataset.roomId;
			this.priceDisplay = element.querySelector('.wp-bnb-calculated-price');
			this.breakdownDisplay = element.querySelector('.wp-bnb-price-breakdown');

			this.bindEvents();
		}

		bindEvents() {
			const checkIn = this.container.querySelector('[name="check_in"]');
			const checkOut = this.container.querySelector('[name="check_out"]');

			if (checkIn && checkOut) {
				const debouncedCalculate = WpBnb.debounce(() => this.calculate(), 300);

				checkIn.addEventListener('change', debouncedCalculate);
				checkOut.addEventListener('change', debouncedCalculate);
			}
		}

		calculate() {
			const checkIn = this.container.querySelector('[name="check_in"]')?.value;
			const checkOut = this.container.querySelector('[name="check_out"]')?.value;

			if (!checkIn || !checkOut || checkOut <= checkIn) {
				this.clearDisplay();
				return;
			}

			this.container.classList.add('wp-bnb-loading');

			WpBnb.ajax('wp_bnb_calculate_price', {
				room_id: this.roomId,
				check_in: checkIn,
				check_out: checkOut
			})
			.then(response => {
				this.displayPrice(response);
			})
			.catch(error => {
				console.error('Price calculation error:', error);
				this.clearDisplay();
			})
			.finally(() => {
				this.container.classList.remove('wp-bnb-loading');
			});
		}

		displayPrice(data) {
			if (this.priceDisplay) {
				this.priceDisplay.innerHTML = `
					<span class="wp-bnb-price-label">${WpBnb.config.i18n?.total || 'Total'}:</span>
					<span class="wp-bnb-price-amount">${this.escapeHtml(data.formatted_total)}</span>
				`;
				this.priceDisplay.style.display = 'block';
			}

			if (this.breakdownDisplay && data.breakdown) {
				let breakdownHtml = '<ul class="wp-bnb-breakdown-list">';

				if (data.breakdown.nights) {
					breakdownHtml += `<li>${data.breakdown.nights} ${WpBnb.config.i18n?.nights || 'nights'}</li>`;
				}
				if (data.breakdown.tier) {
					breakdownHtml += `<li>${this.escapeHtml(data.breakdown.tier)}</li>`;
				}
				if (data.breakdown.base_total) {
					breakdownHtml += `<li>${WpBnb.config.i18n?.basePrice || 'Base'}: ${this.escapeHtml(data.breakdown.base_total)}</li>`;
				}
				if (data.breakdown.weekend_total && parseFloat(data.breakdown.weekend_total) > 0) {
					breakdownHtml += `<li>${WpBnb.config.i18n?.weekendSurcharge || 'Weekend surcharge'}: ${this.escapeHtml(data.breakdown.weekend_total)}</li>`;
				}
				if (data.breakdown.season_name) {
					breakdownHtml += `<li>${WpBnb.config.i18n?.season || 'Season'}: ${this.escapeHtml(data.breakdown.season_name)}</li>`;
				}

				breakdownHtml += '</ul>';

				this.breakdownDisplay.innerHTML = breakdownHtml;
				this.breakdownDisplay.style.display = 'block';
			}
		}

		clearDisplay() {
			if (this.priceDisplay) {
				this.priceDisplay.innerHTML = '';
				this.priceDisplay.style.display = 'none';
			}
			if (this.breakdownDisplay) {
				this.breakdownDisplay.innerHTML = '';
				this.breakdownDisplay.style.display = 'none';
			}
		}

		escapeHtml(str) {
			if (!str) return '';
			const div = document.createElement('div');
			div.textContent = str;
			return div.innerHTML;
		}
	}

	// Initialize on DOM ready.
	if (document.readyState === 'loading') {
		document.addEventListener('DOMContentLoaded', () => WpBnb.init());
	} else {
		WpBnb.init();
	}

	// Expose to global scope for potential external use.
	window.WpBnb = WpBnb;

})();