dees-catalog/ts_web/elements/dees-input-datepicker.ts

import {
  customElement,
  type TemplateResult,
  property,
  html,
  css,
  cssManager,
  state,
} from '@design.estate/dees-element';
import { DeesInputBase } from './dees-input-base.js';
import { demoFunc } from './dees-input-datepicker.demo.js';
import './dees-icon.js';
import './dees-label.js';

declare global {
  interface HTMLElementTagNameMap {
    'dees-input-datepicker': DeesInputDatepicker;
  }
}

@customElement('dees-input-datepicker')
export class DeesInputDatepicker extends DeesInputBase<DeesInputDatepicker> {
  public static demo = demoFunc;

  @property({ type: String })
  public value: string = '';

  @property({ type: Boolean })
  public enableTime: boolean = false;

  @property({ type: String })
  public timeFormat: '24h' | '12h' = '24h';

  @property({ type: Number })
  public minuteIncrement: number = 1;

  @property({ type: String })
  public dateFormat: string = 'YYYY-MM-DD';

  @property({ type: String })
  public minDate: string = '';

  @property({ type: String })
  public maxDate: string = '';

  @property({ type: Array })
  public disabledDates: string[] = [];

  @property({ type: Number })
  public weekStartsOn: 0 | 1 = 1; // Default to Monday

  @property({ type: String })
  public placeholder: string = 'YYYY-MM-DD';

  @state()
  private isOpened: boolean = false;

  @state()
  private opensToTop: boolean = false;

  @state()
  private selectedDate: Date | null = null;

  @state()
  private viewDate: Date = new Date();

  @state()
  private selectedHour: number = 0;

  @state()
  private selectedMinute: number = 0;

  public static styles = [
    ...DeesInputBase.baseStyles,
    cssManager.defaultStyles,
    css`
      :host {
        display: block;
        position: relative;
      }

      .input-container {
        position: relative;
        width: 100%;
      }

      .date-input {
        width: 100%;
        height: 40px;
        padding: 0 12px;
        background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(224 71.4% 4.1%)')};
        border: 1px solid ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
        border-radius: 6px;
        font-size: 14px;
        line-height: 1.5;
        color: ${cssManager.bdTheme('hsl(224 71.4% 4.1%)', 'hsl(210 20% 98%)')};
        cursor: pointer;
        transition: all 0.2s ease;
        outline: none;
        font-family: inherit;
      }

      .date-input::placeholder {
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
      }

      .date-input:hover:not(:disabled) {
        border-color: ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
        background: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(215 27.9% 16.9%)')};
      }

      .date-input:focus,
      .date-input.open {
        border-color: ${cssManager.bdTheme('hsl(222.2 47.4% 11.2%)', 'hsl(210 20% 98%)')};
        outline: 2px solid transparent;
        outline-offset: 2px;
        box-shadow: 0 0 0 2px ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(224 71.4% 4.1%)')}, 0 0 0 4px ${cssManager.bdTheme('hsl(222.2 47.4% 11.2% / 0.1)', 'hsl(210 20% 98% / 0.1)')};
      }

      .date-input:disabled {
        background: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(215 27.9% 16.9%)')};
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
        cursor: not-allowed;
        opacity: 0.5;
      }

      /* Icon container using flexbox for better positioning */
      .icon-container {
        position: absolute;
        right: 0;
        top: 0;
        bottom: 0;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0 12px;
        pointer-events: none;
      }

      .icon-container > * {
        pointer-events: auto;
      }

      .calendar-icon {
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
        pointer-events: none;
        display: flex;
        align-items: center;
        justify-content: center;
      }

      .clear-button {
        width: 20px;
        height: 20px;
        border: none;
        background: transparent;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 4px;
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
        transition: opacity 0.2s ease, background-color 0.2s ease;
        padding: 0;
        flex-shrink: 0;
      }

      .clear-button:hover {
        background: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(215 27.9% 16.9%)')};
        color: ${cssManager.bdTheme('hsl(224 71.4% 4.1%)', 'hsl(210 20% 98%)')};
      }

      .clear-button:disabled {
        display: none;
      }

      /* Calendar Popup Styles */
      .calendar-popup {
        will-change: transform, opacity;
        pointer-events: none;
        transition: all 0.2s ease;
        opacity: 0;
        transform: translateY(-4px);
        background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(224 71.4% 4.1%)')};
        border: 1px solid ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
        box-shadow: ${cssManager.bdTheme(
          '0 10px 15px -3px hsl(0 0% 0% / 0.1), 0 4px 6px -4px hsl(0 0% 0% / 0.1)',
          '0 10px 15px -3px hsl(0 0% 0% / 0.2), 0 4px 6px -4px hsl(0 0% 0% / 0.2)'
        )};
        border-radius: 6px;
        padding: 12px;
        position: absolute;
        user-select: none;
        margin-top: 4px;
        z-index: 50;
        left: 0;
        min-width: 280px;
      }

      .calendar-popup.top {
        bottom: calc(100% + 4px);
        top: auto;
        margin-top: 0;
        margin-bottom: 4px;
        transform: translateY(4px);
      }

      .calendar-popup.bottom {
        top: 100%;
      }

      .calendar-popup.show {
        pointer-events: all;
        transform: translateY(0);
        opacity: 1;
      }

      /* Calendar Header */
      .calendar-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 16px;
        gap: 8px;
      }

      .month-year-display {
        font-weight: 500;
        font-size: 14px;
        color: ${cssManager.bdTheme('hsl(224 71.4% 4.1%)', 'hsl(210 20% 98%)')};
        flex: 1;
        text-align: center;
      }

      .nav-button {
        width: 28px;
        height: 28px;
        border: none;
        background: transparent;
        cursor: pointer;
        border-radius: 6px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
        transition: all 0.2s ease;
      }

      .nav-button:hover {
        background: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(215 27.9% 16.9%)')};
        color: ${cssManager.bdTheme('hsl(224 71.4% 4.1%)', 'hsl(210 20% 98%)')};
      }

      .nav-button:active {
        background: ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
      }

      /* Weekday headers */
      .weekdays {
        display: grid;
        grid-template-columns: repeat(7, 1fr);
        gap: 0;
        margin-bottom: 4px;
      }

      .weekday {
        text-align: center;
        font-size: 12px;
        font-weight: 400;
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
        padding: 0 0 8px 0;
      }

      /* Days grid */
      .days-grid {
        display: grid;
        grid-template-columns: repeat(7, 1fr);
        gap: 2px;
      }

      .day {
        aspect-ratio: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        border-radius: 6px;
        font-size: 14px;
        transition: all 0.2s ease;
        color: ${cssManager.bdTheme('hsl(224 71.4% 4.1%)', 'hsl(210 20% 98%)')};
        border: none;
        width: 36px;
        height: 36px;
        background: transparent;
      }

      .day:hover:not(.disabled) {
        background: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(215 27.9% 16.9%)')};
      }

      .day.other-month {
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
        opacity: 0.5;
      }

      .day.today {
        background: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(215 27.9% 16.9%)')};
        font-weight: 500;
      }

      .day.selected {
        background: ${cssManager.bdTheme('hsl(222.2 47.4% 11.2%)', 'hsl(210 20% 98%)')};
        color: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(222.2 47.4% 11.2%)')};
        font-weight: 500;
      }

      .day.disabled {
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
        cursor: not-allowed;
        opacity: 0.3;
      }

      /* Time selector */
      .time-selector {
        margin-top: 12px;
        padding-top: 12px;
        border-top: 1px solid ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
      }

      .time-selector-title {
        font-size: 12px;
        font-weight: 500;
        margin-bottom: 8px;
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
      }

      .time-inputs {
        display: flex;
        gap: 8px;
        align-items: center;
      }

      .time-input {
        width: 65px;
        height: 36px;
        border: 1px solid ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
        border-radius: 6px;
        padding: 0 12px;
        font-size: 14px;
        text-align: center;
        background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(224 71.4% 4.1%)')};
        color: ${cssManager.bdTheme('hsl(224 71.4% 4.1%)', 'hsl(210 20% 98%)')};
        transition: all 0.2s ease;
      }

      .time-input:hover {
        border-color: ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
        background: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(215 27.9% 16.9%)')};
      }

      .time-input:focus {
        outline: none;
        border-color: ${cssManager.bdTheme('hsl(222.2 47.4% 11.2%)', 'hsl(210 20% 98%)')};
        box-shadow: 0 0 0 2px ${cssManager.bdTheme('hsl(222.2 47.4% 11.2% / 0.1)', 'hsl(210 20% 98% / 0.1)')};
      }

      .time-separator {
        font-size: 14px;
        font-weight: 500;
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
      }

      .am-pm-selector {
        display: flex;
        gap: 4px;
        margin-left: 8px;
      }

      .am-pm-button {
        padding: 6px 12px;
        border: 1px solid ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
        background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(224 71.4% 4.1%)')};
        border-radius: 6px;
        font-size: 12px;
        font-weight: 500;
        cursor: pointer;
        transition: all 0.2s ease;
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
      }

      .am-pm-button.selected {
        background: ${cssManager.bdTheme('hsl(222.2 47.4% 11.2%)', 'hsl(210 20% 98%)')};
        color: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(222.2 47.4% 11.2%)')};
        border-color: ${cssManager.bdTheme('hsl(222.2 47.4% 11.2%)', 'hsl(210 20% 98%)')};
      }

      .am-pm-button:hover:not(.selected) {
        background: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(215 27.9% 16.9%)')};
        border-color: ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
      }

      /* Action buttons */
      .calendar-actions {
        display: flex;
        gap: 8px;
        margin-top: 12px;
        padding-top: 12px;
        border-top: 1px solid ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
      }

      .action-button {
        flex: 1;
        height: 36px;
        border: none;
        border-radius: 6px;
        font-size: 14px;
        font-weight: 500;
        cursor: pointer;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        justify-content: center;
      }

      .today-button {
        background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(224 71.4% 4.1%)')};
        border: 1px solid ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
        color: ${cssManager.bdTheme('hsl(224 71.4% 4.1%)', 'hsl(210 20% 98%)')};
      }

      .today-button:hover {
        background: ${cssManager.bdTheme('hsl(210 20% 98%)', 'hsl(215 27.9% 16.9%)')};
        border-color: ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
      }

      .today-button:active {
        background: ${cssManager.bdTheme('hsl(214.3 31.8% 91.4%)', 'hsl(217.2 32.6% 17.5%)')};
      }

      .clear-button {
        background: transparent;
        border: 1px solid transparent;
        color: ${cssManager.bdTheme('hsl(220 8.9% 46.1%)', 'hsl(215 20.2% 65.1%)')};
      }

      .clear-button:hover {
        background: ${cssManager.bdTheme('hsl(0 72.2% 50.6% / 0.1)', 'hsl(0 62.8% 30.6% / 0.1)')};
        color: ${cssManager.bdTheme('hsl(0 72.2% 50.6%)', 'hsl(0 62.8% 30.6%)')};
      }

      .clear-button:active {
        background: ${cssManager.bdTheme('hsl(0 72.2% 50.6% / 0.2)', 'hsl(0 62.8% 30.6% / 0.2)')};
      }
    `,
  ];

  render(): TemplateResult {
    const monthNames = [
      'January', 'February', 'March', 'April', 'May', 'June',
      'July', 'August', 'September', 'October', 'November', 'December'
    ];

    const weekDays = this.weekStartsOn === 1 
      ? ['Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa', 'Su']
      : ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'];

    const days = this.getDaysInMonth();
    const isAM = this.selectedHour < 12;

    return html`
      <div class="input-wrapper">
        <dees-label .label=${this.label} .description=${this.description} .required=${this.required}></dees-label>
        <div class="input-container">
          <input
            type="text"
            class="date-input ${this.isOpened ? 'open' : ''}"
            .value=${this.formatDate(this.value)}
            .placeholder=${this.placeholder}
            ?disabled=${this.disabled}
            @click=${this.toggleCalendar}
            @keydown=${this.handleKeydown}
            @input=${this.handleManualInput}
            @blur=${this.handleInputBlur}
            style="padding-right: ${this.value ? '64px' : '40px'}"
          />
          <div class="icon-container">
            ${this.value && !this.disabled ? html`
              <button class="clear-button" @click=${this.clearValue} title="Clear">
                <dees-icon icon="lucide:x" iconSize="14"></dees-icon>
              </button>
            ` : ''}
            <dees-icon class="calendar-icon" icon="lucide:calendar" iconSize="16"></dees-icon>
          </div>
          
          <!-- Calendar Popup -->
          <div class="calendar-popup ${this.isOpened ? 'show' : ''} ${this.opensToTop ? 'top' : 'bottom'}">
            <!-- Month/Year Navigation -->
            <div class="calendar-header">
              <button class="nav-button" @click="${this.previousMonth}">
                <dees-icon icon="lucide:chevronLeft" iconSize="16"></dees-icon>
              </button>
              <div class="month-year-display">
                ${monthNames[this.viewDate.getMonth()]} ${this.viewDate.getFullYear()}
              </div>
              <button class="nav-button" @click="${this.nextMonth}">
                <dees-icon icon="lucide:chevronRight" iconSize="16"></dees-icon>
              </button>
            </div>

            <!-- Weekday Headers -->
            <div class="weekdays">
              ${weekDays.map(day => html`<div class="weekday">${day}</div>`)}
            </div>

            <!-- Days Grid -->
            <div class="days-grid">
              ${days.map(day => {
                const isToday = this.isToday(day);
                const isSelected = this.isSelected(day);
                const isOtherMonth = day.getMonth() !== this.viewDate.getMonth();
                const isDisabled = this.isDisabled(day);

                return html`
                  <div 
                    class="day ${isOtherMonth ? 'other-month' : ''} ${isToday ? 'today' : ''} ${isSelected ? 'selected' : ''} ${isDisabled ? 'disabled' : ''}"
                    @click="${() => !isDisabled && this.selectDate(day)}"
                  >
                    ${day.getDate()}
                  </div>
                `;
              })}
            </div>

            <!-- Time Selector -->
            ${this.enableTime ? html`
              <div class="time-selector">
                <div class="time-selector-title">Time</div>
                <div class="time-inputs">
                  <input 
                    type="number" 
                    class="time-input" 
                    .value="${this.timeFormat === '12h' 
                      ? (this.selectedHour === 0 ? 12 : this.selectedHour > 12 ? this.selectedHour - 12 : this.selectedHour).toString().padStart(2, '0')
                      : this.selectedHour.toString().padStart(2, '0')}"
                    @input="${(e: InputEvent) => this.handleHourInput(e)}"
                    min="${this.timeFormat === '12h' ? 1 : 0}"
                    max="${this.timeFormat === '12h' ? 12 : 23}"
                  />
                  <span class="time-separator">:</span>
                  <input 
                    type="number" 
                    class="time-input" 
                    .value="${this.selectedMinute.toString().padStart(2, '0')}"
                    @input="${(e: InputEvent) => this.handleMinuteInput(e)}"
                    min="0"
                    max="59"
                    step="${this.minuteIncrement || 1}"
                  />
                  ${this.timeFormat === '12h' ? html`
                    <div class="am-pm-selector">
                      <button 
                        class="am-pm-button ${isAM ? 'selected' : ''}"
                        @click="${() => this.setAMPM('am')}"
                      >
                        AM
                      </button>
                      <button 
                        class="am-pm-button ${!isAM ? 'selected' : ''}"
                        @click="${() => this.setAMPM('pm')}"
                      >
                        PM
                      </button>
                    </div>
                  ` : ''}
                </div>
              </div>
            ` : ''}

            <!-- Action Buttons -->
            <div class="calendar-actions">
              <button class="action-button today-button" @click="${this.selectToday}">
                Today
              </button>
              <button class="action-button clear-button" @click="${this.clear}">
                Clear
              </button>
            </div>
          </div>
        </div>
      </div>
    `;
  }

  async connectedCallback() {
    super.connectedCallback();
    this.handleClickOutside = this.handleClickOutside.bind(this);
  }

  async disconnectedCallback() {
    await super.disconnectedCallback();
    document.removeEventListener('click', this.handleClickOutside);
  }

  async firstUpdated() {
    // Initialize with empty value if not set
    if (!this.value) {
      this.value = '';
    }

    // Initialize view date and selected time
    if (this.value) {
      try {
        const date = new Date(this.value);
        if (!isNaN(date.getTime())) {
          this.selectedDate = date;
          this.viewDate = new Date(date);
          this.selectedHour = date.getHours();
          this.selectedMinute = date.getMinutes();
        }
      } catch {
        // Invalid date
      }
    } else {
      const now = new Date();
      this.viewDate = new Date(now);
      this.selectedHour = now.getHours();
      this.selectedMinute = 0;
    }
  }

  public formatDate(isoString: string): string {
    if (!isoString) return '';

    try {
      const date = new Date(isoString);
      if (isNaN(date.getTime())) return '';

      let formatted = this.dateFormat;
      
      // Basic date formatting
      const day = date.getDate().toString().padStart(2, '0');
      const month = (date.getMonth() + 1).toString().padStart(2, '0');
      const year = date.getFullYear().toString();
      
      // Replace in correct order to avoid conflicts
      formatted = formatted.replace('YYYY', year);
      formatted = formatted.replace('YY', year.slice(-2));
      formatted = formatted.replace('MM', month);
      formatted = formatted.replace('DD', day);

      // Time formatting if enabled
      if (this.enableTime) {
        const hours24 = date.getHours();
        const hours12 = hours24 === 0 ? 12 : hours24 > 12 ? hours24 - 12 : hours24;
        const minutes = date.getMinutes().toString().padStart(2, '0');
        const ampm = hours24 >= 12 ? 'PM' : 'AM';

        if (this.timeFormat === '12h') {
          formatted += ` ${hours12}:${minutes} ${ampm}`;
        } else {
          formatted += ` ${hours24.toString().padStart(2, '0')}:${minutes}`;
        }
      }

      return formatted;
    } catch {
      return '';
    }
  }

  private handleClickOutside = (event: MouseEvent) => {
    const path = event.composedPath();
    if (!path.includes(this)) {
      this.isOpened = false;
      document.removeEventListener('click', this.handleClickOutside);
    }
  };

  private async toggleCalendar(): Promise<void> {
    if (this.disabled) return;

    this.isOpened = !this.isOpened;

    if (this.isOpened) {
      // Check available space and set position
      const inputContainer = this.shadowRoot!.querySelector('.input-container') as HTMLElement;
      const rect = inputContainer.getBoundingClientRect();
      const spaceBelow = window.innerHeight - rect.bottom;
      const spaceAbove = rect.top;
      
      // Determine if we should open upwards (approximate height of 400px)
      this.opensToTop = spaceBelow < 400 && spaceAbove > spaceBelow;

      // Add click outside listener
      setTimeout(() => {
        document.addEventListener('click', this.handleClickOutside);
      }, 0);
    } else {
      document.removeEventListener('click', this.handleClickOutside);
    }
  }

  private getDaysInMonth(): Date[] {
    const year = this.viewDate.getFullYear();
    const month = this.viewDate.getMonth();
    const firstDay = new Date(year, month, 1);
    const lastDay = new Date(year, month + 1, 0);
    const days: Date[] = [];

    // Adjust for week start
    const startOffset = this.weekStartsOn === 1 
      ? (firstDay.getDay() === 0 ? 6 : firstDay.getDay() - 1)
      : firstDay.getDay();

    // Add days from previous month
    for (let i = startOffset; i > 0; i--) {
      days.push(new Date(year, month, 1 - i));
    }

    // Add days of current month
    for (let i = 1; i <= lastDay.getDate(); i++) {
      days.push(new Date(year, month, i));
    }

    // Add days from next month to complete the grid (6 rows)
    const remainingDays = 42 - days.length;
    for (let i = 1; i <= remainingDays; i++) {
      days.push(new Date(year, month + 1, i));
    }

    return days;
  }

  private isToday(date: Date): boolean {
    const today = new Date();
    return date.getDate() === today.getDate() &&
           date.getMonth() === today.getMonth() &&
           date.getFullYear() === today.getFullYear();
  }

  private isSelected(date: Date): boolean {
    if (!this.selectedDate) return false;
    return date.getDate() === this.selectedDate.getDate() &&
           date.getMonth() === this.selectedDate.getMonth() &&
           date.getFullYear() === this.selectedDate.getFullYear();
  }

  private isDisabled(date: Date): boolean {
    // Check min date
    if (this.minDate) {
      const min = new Date(this.minDate);
      if (date < min) return true;
    }

    // Check max date
    if (this.maxDate) {
      const max = new Date(this.maxDate);
      if (date > max) return true;
    }

    // Check disabled dates
    if (this.disabledDates && this.disabledDates.length > 0) {
      return this.disabledDates.some(disabledStr => {
        try {
          const disabled = new Date(disabledStr);
          return date.getDate() === disabled.getDate() &&
                 date.getMonth() === disabled.getMonth() &&
                 date.getFullYear() === disabled.getFullYear();
        } catch {
          return false;
        }
      });
    }

    return false;
  }

  private selectDate(date: Date): void {
    this.selectedDate = new Date(
      date.getFullYear(),
      date.getMonth(),
      date.getDate(),
      this.selectedHour,
      this.selectedMinute
    );
    
    this.value = this.selectedDate.toISOString();
    this.changeSubject.next(this);
    
    if (!this.enableTime) {
      this.isOpened = false;
    }
  }

  private selectToday(): void {
    const today = new Date();
    this.selectedDate = today;
    this.viewDate = new Date(today);
    this.selectedHour = today.getHours();
    this.selectedMinute = today.getMinutes();
    
    this.value = this.selectedDate.toISOString();
    this.changeSubject.next(this);
    
    if (!this.enableTime) {
      this.isOpened = false;
    }
  }

  private clear(): void {
    this.value = '';
    this.selectedDate = null;
    this.changeSubject.next(this);
    this.isOpened = false;
  }

  private previousMonth(): void {
    this.viewDate = new Date(this.viewDate.getFullYear(), this.viewDate.getMonth() - 1, 1);
  }

  private nextMonth(): void {
    this.viewDate = new Date(this.viewDate.getFullYear(), this.viewDate.getMonth() + 1, 1);
  }

  private handleHourInput(e: InputEvent): void {
    const input = e.target as HTMLInputElement;
    let value = parseInt(input.value) || 0;
    
    if (this.timeFormat === '12h') {
      value = Math.max(1, Math.min(12, value));
      // Convert to 24h format
      if (this.selectedHour >= 12 && value !== 12) {
        this.selectedHour = value + 12;
      } else if (this.selectedHour < 12 && value === 12) {
        this.selectedHour = 0;
      } else {
        this.selectedHour = value;
      }
    } else {
      this.selectedHour = Math.max(0, Math.min(23, value));
    }
    
    this.updateSelectedDateTime();
  }

  private handleMinuteInput(e: InputEvent): void {
    const input = e.target as HTMLInputElement;
    let value = parseInt(input.value) || 0;
    value = Math.max(0, Math.min(59, value));
    
    if (this.minuteIncrement && this.minuteIncrement > 1) {
      value = Math.round(value / this.minuteIncrement) * this.minuteIncrement;
    }
    
    this.selectedMinute = value;
    this.updateSelectedDateTime();
  }

  private setAMPM(period: 'am' | 'pm'): void {
    if (period === 'am' && this.selectedHour >= 12) {
      this.selectedHour -= 12;
    } else if (period === 'pm' && this.selectedHour < 12) {
      this.selectedHour += 12;
    }
    this.updateSelectedDateTime();
  }

  private updateSelectedDateTime(): void {
    if (this.selectedDate) {
      this.selectedDate = new Date(
        this.selectedDate.getFullYear(),
        this.selectedDate.getMonth(),
        this.selectedDate.getDate(),
        this.selectedHour,
        this.selectedMinute
      );
      this.value = this.selectedDate.toISOString();
      this.changeSubject.next(this);
    }
  }

  private handleKeydown(e: KeyboardEvent): void {
    if (e.key === 'Enter' || e.key === ' ') {
      e.preventDefault();
      this.toggleCalendar();
    } else if (e.key === 'Escape' && this.isOpened) {
      e.preventDefault();
      this.isOpened = false;
    }
  }

  private clearValue(e: Event): void {
    e.stopPropagation();
    this.value = '';
    this.selectedDate = null;
    this.changeSubject.next(this);
  }

  private handleManualInput(e: InputEvent): void {
    const input = e.target as HTMLInputElement;
    const inputValue = input.value.trim();
    
    if (!inputValue) {
      // Clear the value if input is empty
      this.value = '';
      this.selectedDate = null;
      return;
    }

    const parsedDate = this.parseManualDate(inputValue);
    if (parsedDate && !isNaN(parsedDate.getTime())) {
      // Update internal state without triggering re-render of input
      this.value = parsedDate.toISOString();
      this.selectedDate = parsedDate;
      this.viewDate = new Date(parsedDate);
      this.selectedHour = parsedDate.getHours();
      this.selectedMinute = parsedDate.getMinutes();
      this.changeSubject.next(this);
    }
  }

  private handleInputBlur(e: FocusEvent): void {
    const input = e.target as HTMLInputElement;
    const inputValue = input.value.trim();
    
    if (!inputValue) {
      this.value = '';
      this.selectedDate = null;
      this.changeSubject.next(this);
      return;
    }

    const parsedDate = this.parseManualDate(inputValue);
    if (parsedDate && !isNaN(parsedDate.getTime())) {
      this.value = parsedDate.toISOString();
      this.selectedDate = parsedDate;
      this.viewDate = new Date(parsedDate);
      this.selectedHour = parsedDate.getHours();
      this.selectedMinute = parsedDate.getMinutes();
      this.changeSubject.next(this);
      // Update the input with formatted date
      input.value = this.formatDate(this.value);
    } else {
      // Revert to previous valid value on blur if parsing failed
      input.value = this.formatDate(this.value);
    }
  }

  private parseManualDate(input: string): Date | null {
    if (!input) return null;

    // Split date and time parts if present
    const parts = input.split(' ');
    let datePart = parts[0];
    let timePart = parts[1] || '';

    let parsedDate: Date | null = null;

    // Try different date formats
    // Format 1: YYYY-MM-DD (ISO-like)
    const isoMatch = datePart.match(/^(\d{4})-(\d{1,2})-(\d{1,2})$/);
    if (isoMatch) {
      const [_, year, month, day] = isoMatch;
      parsedDate = new Date(parseInt(year), parseInt(month) - 1, parseInt(day));
    }

    // Format 2: DD.MM.YYYY (European)
    if (!parsedDate) {
      const euMatch = datePart.match(/^(\d{1,2})\.(\d{1,2})\.(\d{4})$/);
      if (euMatch) {
        const [_, day, month, year] = euMatch;
        parsedDate = new Date(parseInt(year), parseInt(month) - 1, parseInt(day));
      }
    }

    // Format 3: MM/DD/YYYY (US)
    if (!parsedDate) {
      const usMatch = datePart.match(/^(\d{1,2})\/(\d{1,2})\/(\d{4})$/);
      if (usMatch) {
        const [_, month, day, year] = usMatch;
        parsedDate = new Date(parseInt(year), parseInt(month) - 1, parseInt(day));
      }
    }

    // If no date was parsed, return null
    if (!parsedDate || isNaN(parsedDate.getTime())) {
      return null;
    }

    // Parse time if present (HH:MM format)
    if (timePart) {
      const timeMatch = timePart.match(/^(\d{1,2}):(\d{2})$/);
      if (timeMatch) {
        const [_, hours, minutes] = timeMatch;
        parsedDate.setHours(parseInt(hours));
        parsedDate.setMinutes(parseInt(minutes));
      }
    } else if (!this.enableTime) {
      // If time is not enabled and not provided, use current time
      const now = new Date();
      parsedDate.setHours(now.getHours());
      parsedDate.setMinutes(now.getMinutes());
      parsedDate.setSeconds(0);
      parsedDate.setMilliseconds(0);
    }

    return parsedDate;
  }

  public getValue(): string {
    return this.value;
  }

  public setValue(value: string): void {
    this.value = value;
    if (value) {
      try {
        const date = new Date(value);
        if (!isNaN(date.getTime())) {
          this.selectedDate = date;
          this.viewDate = new Date(date);
          this.selectedHour = date.getHours();
          this.selectedMinute = date.getMinutes();
        }
      } catch {
        // Invalid date
      }
    }
  }
}