package datepicker

// DatePicker renders a reusable date picker component with DD/MM/YYYY format
//
// Features:
//   - Interactive calendar dropdown with month/year selectors
//   - DD/MM/YYYY format (proper date format, none of that American nonsense)
//   - Year range: 2001-2051
//   - Today's date highlighted in blue
//   - Click outside to close
//   - Consistent with Catppuccin theme
//
// Parameters:
//   - id: unique ID for the input field (e.g., "start_date")
//   - name: form field name (e.g., "start_date")
//   - label: display label (e.g., "Start Date")
//   - placeholder: input placeholder (default: "DD/MM/YYYY")
//   - required: whether the field is required (true/false)
//   - onChange: Alpine.js expression to run when date changes (e.g., "dateIsEmpty = false; updateCanSubmit();")
//             Set to empty string "" if no custom onChange handler is needed
//
// Usage Example:
//   import "git.haelnorr.com/h/oslstats/internal/view/component/datepicker"
//
//   @datepicker.DatePicker("birth_date", "birth_date", "Date of Birth", "DD/MM/YYYY", true, "handleDateChange();")
//
// The component submits the date in DD/MM/YYYY format. To parse on the server:
//   date, err := time.Parse("02/01/2006", dateString)
templ DatePicker(id, name, label, placeholder string, required bool, onChange string) {
	<div
		x-data="{ 
		showPicker: false,
		selectedDate: '',
		displayDate: '',
		tempYear: new Date().getFullYear(),
		tempMonth: new Date().getMonth(),
		months: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
		init() {
			// Ensure dropdowns are initialized with current month/year
			this.tempYear = new Date().getFullYear();
			this.tempMonth = new Date().getMonth();
		},
		getDaysInMonth(year, month) {
			return new Date(year, month + 1, 0).getDate();
		},
		getFirstDayOfMonth(year, month) {
			return new Date(year, month, 1).getDay();
		},
		selectDate(day) {
			const d = String(day).padStart(2, '0');
			const m = String(this.tempMonth + 1).padStart(2, '0');
			const y = this.tempYear;
			this.displayDate = d + '/' + m + '/' + y;
			this.selectedDate = this.displayDate;
			$refs.dateInput.value = this.displayDate;
			this.showPicker = false;
			// Manually trigger input event so Alpine.js @input handler fires
			$refs.dateInput.dispatchEvent(new Event('input', { bubbles: true }));
		},
		prevMonth() {
			if (this.tempMonth === 0) {
				this.tempMonth = 11;
				this.tempYear--;
			} else {
				this.tempMonth--;
			}
		},
		nextMonth() {
			if (this.tempMonth === 11) {
				this.tempMonth = 0;
				this.tempYear++;
			} else {
				this.tempMonth++;
			}
		},
		isToday(day) {
			const today = new Date();
			return day === today.getDate() && 
				this.tempMonth === today.getMonth() && 
				this.tempYear === today.getFullYear();
		}
	}"
	>
		<label for={ id } class="block text-sm font-medium mb-2">{ label }</label>
		<div class="relative">
			<input
				type="text"
				id={ id }
				name={ name }
				x-ref="dateInput"
				class="py-3 px-4 pr-10 block w-full rounded-lg text-sm bg-base border-2 border-overlay0 focus:border-blue outline-none"
				placeholder={ placeholder }
				pattern="\d{2}/\d{2}/\d{4}"
				if required {
					required
				}
				readonly
				x-model="displayDate"
				@click="showPicker = !showPicker"
				if onChange != "" {
					@input={ onChange }
				}
			/>
			<button
				type="button"
				class="absolute right-3 top-1/2 -translate-y-1/2 text-subtext0 hover:text-text"
				@click="showPicker = !showPicker"
			>
				<svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
					<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 7V3m8 4V3m-9 8h10M5 21h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z"></path>
				</svg>
			</button>
			<!-- Date Picker Dropdown -->
			<div
				x-show="showPicker"
				x-cloak
				@click.away="showPicker = false"
				class="absolute z-50 mt-2 bg-mantle border-2 border-surface1 rounded-lg shadow-lg p-4 w-80"
			>
				<!-- Month/Year Navigation -->
				<div class="flex items-center justify-between gap-2 mb-4">
					<button type="button" @click="prevMonth()" class="p-1 hover:bg-surface0 rounded shrink-0">
						<svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
							<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7"></path>
						</svg>
					</button>
					<div class="flex gap-2 flex-1">
						<select
							x-model.number="tempMonth"
							class="flex-1 px-2 py-1 text-sm bg-surface0 border border-surface1 rounded outline-none focus:border-blue"
						>
							<option value="0">January</option>
							<option value="1">February</option>
							<option value="2">March</option>
							<option value="3">April</option>
							<option value="4">May</option>
							<option value="5">June</option>
							<option value="6">July</option>
							<option value="7">August</option>
							<option value="8">September</option>
							<option value="9">October</option>
							<option value="10">November</option>
							<option value="11">December</option>
						</select>
						<select
							x-model.number="tempYear"
							class="px-2 py-1 text-sm bg-surface0 border border-surface1 rounded outline-none focus:border-blue"
						>
							<option value="2001">2001</option>
							<option value="2002">2002</option>
							<option value="2003">2003</option>
							<option value="2004">2004</option>
							<option value="2005">2005</option>
							<option value="2006">2006</option>
							<option value="2007">2007</option>
							<option value="2008">2008</option>
							<option value="2009">2009</option>
							<option value="2010">2010</option>
							<option value="2011">2011</option>
							<option value="2012">2012</option>
							<option value="2013">2013</option>
							<option value="2014">2014</option>
							<option value="2015">2015</option>
							<option value="2016">2016</option>
							<option value="2017">2017</option>
							<option value="2018">2018</option>
							<option value="2019">2019</option>
							<option value="2020">2020</option>
							<option value="2021">2021</option>
							<option value="2022">2022</option>
							<option value="2023">2023</option>
							<option value="2024">2024</option>
							<option value="2025">2025</option>
							<option value="2026">2026</option>
							<option value="2027">2027</option>
							<option value="2028">2028</option>
							<option value="2029">2029</option>
							<option value="2030">2030</option>
							<option value="2031">2031</option>
							<option value="2032">2032</option>
							<option value="2033">2033</option>
							<option value="2034">2034</option>
							<option value="2035">2035</option>
							<option value="2036">2036</option>
							<option value="2037">2037</option>
							<option value="2038">2038</option>
							<option value="2039">2039</option>
							<option value="2040">2040</option>
							<option value="2041">2041</option>
							<option value="2042">2042</option>
							<option value="2043">2043</option>
							<option value="2044">2044</option>
							<option value="2045">2045</option>
							<option value="2046">2046</option>
							<option value="2047">2047</option>
							<option value="2048">2048</option>
							<option value="2049">2049</option>
							<option value="2050">2050</option>
							<option value="2051">2051</option>
						</select>
					</div>
					<button type="button" @click="nextMonth()" class="p-1 hover:bg-surface0 rounded shrink-0">
						<svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
							<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"></path>
						</svg>
					</button>
				</div>
				<!-- Day Headers -->
				<div class="grid grid-cols-7 gap-1 mb-2">
					<div class="text-center text-xs font-medium text-subtext0 py-1">Su</div>
					<div class="text-center text-xs font-medium text-subtext0 py-1">Mo</div>
					<div class="text-center text-xs font-medium text-subtext0 py-1">Tu</div>
					<div class="text-center text-xs font-medium text-subtext0 py-1">We</div>
					<div class="text-center text-xs font-medium text-subtext0 py-1">Th</div>
					<div class="text-center text-xs font-medium text-subtext0 py-1">Fr</div>
					<div class="text-center text-xs font-medium text-subtext0 py-1">Sa</div>
				</div>
				<!-- Calendar Days -->
				<div class="grid grid-cols-7 gap-1">
					<template x-for="blank in getFirstDayOfMonth(tempYear, tempMonth)" :key="'blank-' + blank">
						<div class="text-center py-2"></div>
					</template>
					<template x-for="day in getDaysInMonth(tempYear, tempMonth)" :key="'day-' + day">
						<button
							type="button"
							@click="selectDate(day)"
							class="text-center py-2 rounded hover:bg-surface0 transition"
							:class="{
								'bg-blue text-mantle font-bold': isToday(day),
								'hover:bg-surface1': !isToday(day)
							}"
							x-text="day"
						></button>
					</template>
				</div>
			</div>
		</div>
	</div>
}