Vue.component('tt-select', {
    props: {
        options: {type: Array, required: true},
        label: {type: String, default: null},
        required: {type: Boolean, default: false},
        value: {type: [String, Number, Array], default: null},
        disabled: {type: Boolean, default: false},
        suffix: {type: String, default: null},
        sm: {type: Boolean, default: false},
        row: {type: Boolean, default: false},
        multiple: {type: Boolean, default: false},
        searchable: {type: Boolean, default: true}
    },

    data() {
        return {
            open: false,
            searchQuery: '',
            selected: this.multiple ? (Array.isArray(this.value) ? [...this.value] : []) : this.value
        };
    },

    watch: {
        value(newVal) {
            this.selected = this.multiple ? (Array.isArray(newVal) ? [...newVal] : []) : newVal;
        },
        open(isOpen) {
            if (!isOpen) {
                this.searchQuery = ''; // Reset search on close
                return;
            }
            this.$nextTick(() => {
                if (this.searchable && this.$refs.searchInput) {
                    this.$refs.searchInput.focus();
                }
                if (this.$refs.optionsList) {
                    this.$refs.optionsList.scrollTop = 0;
                }
            });
        }
    },

    mounted() {
        document.addEventListener('click', this.onClickOutside);
        document.addEventListener('tt-select-open', this.handleGlobalOpen);
    },

    beforeDestroy() {
        document.removeEventListener('click', this.onClickOutside);
        document.removeEventListener('tt-select-open', this.handleGlobalOpen);
    },

    computed: {
        normalizedOptions() {
            return this.options.map(opt =>
                (opt !== null && typeof opt === 'object')
                    ? {value: opt.value, text: opt.text, disabled: !!opt.disabled}
                    : {value: opt, text: String(opt), disabled: false}
            );
        },

        filteredOptions() {
            const displayLimit = 100;

            if (!this.searchable || !this.searchQuery) {
                return this.normalizedOptions.slice(0, displayLimit);
            }

            const q = this.searchQuery.toLowerCase();
            return this.normalizedOptions
                .filter(option => option.text.toLowerCase().includes(q))
                .slice(0, displayLimit);
        },

        displayText() {
            const addSuffix = text => text ? `${text}${this.suffix ? ` ${this.suffix}` : ''}` : '';

            if (!this.multiple) {
                const opt = this.normalizedOptions.find(o => o.value === this.selected);
                return opt ? addSuffix(opt.text) : 'Auswählen...';
            }

            const count = Array.isArray(this.selected) ? this.selected.length : 0;
            if (count === 0) return 'Auswählen...';
            if (count === 1) {
                const opt = this.normalizedOptions.find(o => o.value === this.selected[0]);
                return opt ? addSuffix(opt.text) : '';
            }
            return `${count} ausgewählt`;
        },

        hasSelection() {
            if (this.multiple) {
                return Array.isArray(this.selected) && this.selected.length > 0;
            }
            return this.selected !== null && this.selected !== undefined && this.selected !== '';
        }
    },

    methods: {
        toggleDropdown() {
            if (this.disabled) return;
            if (!this.open) {
                this.$emit('focus');
                // Dispatch event that this select is opening
                document.dispatchEvent(new CustomEvent('tt-select-open', { detail: { id: this._uid } }));
            }
            this.open = !this.open;
        },

        onClickOutside(e) {
            if (this.$el && !this.$el.contains(e.target)) {
                this.open = false;
            }
        },

        handleGlobalOpen(event) {
            if (event.detail.id !== this._uid) {
                this.open = false;
            }
        },

        isSelected(opt) {
            return this.multiple
                ? Array.isArray(this.selected) && this.selected.includes(opt.value)
                : this.selected === opt.value;
        },

        selectOption(opt) {
            if (opt.disabled) return;

            if (this.multiple) {
                const newSelection = Array.isArray(this.selected) ? [...this.selected] : [];
                const index = newSelection.indexOf(opt.value);
                if (index > -1) {
                    newSelection.splice(index, 1);
                } else {
                    newSelection.push(opt.value);
                }
                this.selected = newSelection;
            } else {
                this.selected = opt.value;
                this.open = false; // Close on selection for single mode
            }
            this.$emit('input', this.selected);
        },

        handleEnter() {
            if (this.searchQuery && this.filteredOptions.length === 1) {
                this.selectOption(this.filteredOptions[0]);
                if (!this.multiple) this.open = false;
            }
        }
    },

    template: `
      <div class="form-group" :class="[{ 'row': row }, 'tt-select-modern']">
        <label v-if="label" :for="'tt-select-' + _uid"
               :class="['col-form-label', { 'col-sm-4': row, 'col-form-label-sm': sm && row }]">
          {{ label }}
        </label>

        <div :class="{ 'col-sm-8 p-0': row }">
          <div class="tt-select-container">
            <button type="button" class="tt-select-trigger"
                    :id="'tt-select-' + _uid"
                    :class="{ 'sm': sm, 'open': open }"
                    :disabled="disabled"
                    @click.stop="toggleDropdown">
              <span class="trigger-text" :class="{'placeholder': !hasSelection}">{{ displayText }}</span>
              <i class="fas fa-chevron-down trigger-arrow"></i>
            </button>

            <div class="tt-select-dropdown" :class="{ show: open }" @click.stop>
              <div class="dropdown-header">
                <span>{{ label || 'Auswählen' }}</span>
                <button type="button" class="close-btn" @click="toggleDropdown">&times;</button>
              </div>

              <div v-if="searchable" class="search-input-wrapper">
                <input ref="searchInput" type="text" class="search-input"
                       v-model="searchQuery" :disabled="disabled" placeholder="Suchen..."
                       @keydown.enter.prevent="handleEnter">
              </div>

              <ul class="options-list" ref="optionsList">
                <li v-if="!filteredOptions.length" class="no-results">
                  Keine Ergebnisse gefunden.
                </li>
                <li v-for="opt in filteredOptions" :key="opt.value"
                    class="option-item"
                    :class="{ 'selected': isSelected(opt), 'disabled': opt.disabled }"
                    @click="selectOption(opt)">
                  <div class="option-label">
                    <input :type="multiple ? 'checkbox' : 'radio'"
                           :name="'option-' + _uid"
                           :value="opt.value"
                           :checked="isSelected(opt)"
                           :disabled="opt.disabled">
                    <span>{{ opt.text }}<span v-if="suffix"> {{ suffix }}</span></span>
                  </div>
                  <i v-if="isSelected(opt)" class="fas fa-check option-checkmark"></i>
                </li>
              </ul>
            </div>
          </div>
        </div>
      </div>
    `
});