// Filename: frontend/js/components/customSelect.js

export default class CustomSelect {
    constructor(container) {
        this.container = container;
        this.trigger = this.container.querySelector('.custom-select-trigger');
        this.panel = this.container.querySelector('.custom-select-panel');

        if (!this.trigger || !this.panel) {
            console.warn('CustomSelect cannot initialize: missing .custom-select-trigger or .custom-select-panel.', this.container);
            return;
        }

        this.nativeSelect = this.container.querySelector('select');
        this.triggerText = this.trigger.querySelector('span');
        this.template = this.panel.querySelector('.custom-select-option-template');
        
        
        if (typeof CustomSelect.openInstance === 'undefined') {
            CustomSelect.openInstance = null;
            CustomSelect.initGlobalListener();
        }
        
        if (this.nativeSelect) {
            this.generateOptions();
            this.updateTriggerText();
        }
        
        this.bindEvents(); 
    }

    static initGlobalListener() {
        document.addEventListener('click', (event) => {
            if (CustomSelect.openInstance && !CustomSelect.openInstance.container.contains(event.target)) {
                CustomSelect.openInstance.close();
            }
        });
    }

    generateOptions() {
        this.panel.querySelectorAll(':scope > *:not(.custom-select-option-template)').forEach(child => child.remove());
        Array.from(this.nativeSelect.options).forEach(option => {
            let item;
            if (this.template) {
                item = this.template.cloneNode(true);
                item.classList.remove('custom-select-option-template');
                item.removeAttribute('hidden');
            } else {
                item = document.createElement('a');
                item.href = '#';
                item.className = 'block px-4 py-2 text-sm text-zinc-700 hover:bg-zinc-100 dark:text-zinc-200 dark:hover:bg-zinc-600';
            }
            item.classList.add('custom-select-option');
            item.textContent = option.textContent;
            item.dataset.value = option.value;
            if (option.selected) { item.classList.add('is-selected'); }
            this.panel.appendChild(item);
        });
    }

    bindEvents() {
        this.trigger.addEventListener('click', (event) => {
            // [NEW] Guard clause: If the trigger is functionally disabled, do nothing.
            if (this.trigger.classList.contains('is-disabled')) {
                return;
            }
            event.stopPropagation();
            if (CustomSelect.openInstance && CustomSelect.openInstance !== this) {
                CustomSelect.openInstance.close();
            }
            this.toggle();
        });
        if (this.nativeSelect) {
            this.panel.addEventListener('click', (event) => {
                event.preventDefault();
                const option = event.target.closest('.custom-select-option');
                if (option) { this.selectOption(option); }
            });
        }
    }
    
    selectOption(optionEl) {
        const selectedValue = optionEl.dataset.value;
        if (this.nativeSelect.value !== selectedValue) {
            this.nativeSelect.value = selectedValue;
            this.nativeSelect.dispatchEvent(new Event('change', { bubbles: true }));
        }
        this.updateTriggerText();
        this.panel.querySelectorAll('.custom-select-option').forEach(el => el.classList.remove('is-selected'));
        optionEl.classList.add('is-selected');
        this.close();
    }

    updateTriggerText() {
        // [IMPROVEMENT] Guard against missing elements.
        if (!this.nativeSelect || !this.triggerText) return;
        
        const selectedOption = this.nativeSelect.options[this.nativeSelect.selectedIndex];
        if (selectedOption) {
            this.triggerText.textContent = selectedOption.textContent;
        }
    }

    toggle() {
        this.panel.classList.toggle('hidden');
        if (this.panel.classList.contains('hidden')) {
            if (CustomSelect.openInstance === this) {
                 CustomSelect.openInstance = null;
            }
        } else {
            CustomSelect.openInstance = this;
        }
    }

    open() {
        this.panel.classList.remove('hidden');
        CustomSelect.openInstance = this;
    }
    
    close() {
        this.panel.classList.add('hidden');
        if (CustomSelect.openInstance === this) {
            CustomSelect.openInstance = null;
        }
    }
}