import { CoreEvents } from '../constants/CoreEvents';
/**
 * ViewSelectorManager - Manages view selector UI and state
 *
 * RESPONSIBILITY:
 * ===============
 * This manager owns all logic related to the <swp-view-selector> UI element.
 * It follows the principle that each functional UI element has its own manager.
 *
 * RESPONSIBILITIES:
 * - Handles button clicks on swp-view-button elements
 * - Manages current view state (day/week/month)
 * - Validates view values
 * - Emits VIEW_CHANGED and VIEW_RENDERED events
 * - Updates button UI states (data-active attributes)
 *
 * EVENT FLOW:
 * ===========
 * User clicks button → changeView() → validate → update state → emit event → update UI
 *
 * IMPLEMENTATION STATUS:
 * ======================
 * - Week view: FULLY IMPLEMENTED
 * - Day view: NOT IMPLEMENTED (button exists but no rendering)
 * - Month view: NOT IMPLEMENTED (button exists but no rendering)
 *
 * SUBSCRIBERS:
 * ============
 * - GridRenderer: Uses view parameter (currently only supports 'week')
 * - Future: DayRenderer, MonthRenderer when implemented
 */
export class ViewSelectorManager {
    constructor(eventBus, config) {
        this.buttonListeners = new Map();
        this.eventBus = eventBus;
        this.config = config;
        this.setupButtonListeners();
        this.setupEventListeners();
    }
    /**
     * Setup click listeners on all view selector buttons
     */
    setupButtonListeners() {
        const buttons = document.querySelectorAll('swp-view-button[data-view]');
        buttons.forEach(button => {
            const clickHandler = (event) => {
                event.preventDefault();
                const view = button.getAttribute('data-view');
                if (view && this.isValidView(view)) {
                    this.changeView(view);
                }
            };
            button.addEventListener('click', clickHandler);
            this.buttonListeners.set(button, clickHandler);
        });
        // Initialize button states
        this.updateButtonStates();
    }
    /**
     * Setup event bus listeners
     */
    setupEventListeners() {
        this.eventBus.on(CoreEvents.INITIALIZED, () => {
            this.initializeView();
        });
        this.eventBus.on(CoreEvents.DATE_CHANGED, () => {
            this.refreshCurrentView();
        });
    }
    /**
     * Change the active view
     */
    changeView(newView) {
        if (newView === this.config.currentView) {
            return; // No change
        }
        const previousView = this.config.currentView;
        this.config.currentView = newView;
        // Update button UI states
        this.updateButtonStates();
        // Emit event for subscribers
        this.eventBus.emit(CoreEvents.VIEW_CHANGED, {
            previousView,
            currentView: newView
        });
    }
    /**
     * Update button states (data-active attributes)
     */
    updateButtonStates() {
        const buttons = document.querySelectorAll('swp-view-button[data-view]');
        buttons.forEach(button => {
            const buttonView = button.getAttribute('data-view');
            if (buttonView === this.config.currentView) {
                button.setAttribute('data-active', 'true');
            }
            else {
                button.removeAttribute('data-active');
            }
        });
    }
    /**
     * Initialize view on INITIALIZED event
     */
    initializeView() {
        this.updateButtonStates();
        this.emitViewRendered();
    }
    /**
     * Emit VIEW_RENDERED event
     */
    emitViewRendered() {
        this.eventBus.emit(CoreEvents.VIEW_RENDERED, {
            view: this.config.currentView
        });
    }
    /**
     * Refresh current view on DATE_CHANGED event
     */
    refreshCurrentView() {
        this.emitViewRendered();
    }
    /**
     * Validate if string is a valid CalendarView type
     */
    isValidView(view) {
        return ['day', 'week', 'month'].includes(view);
    }
}
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