/**
 * HintManager - Context-aware hint system for RTS game
 * Shows helpful hints at the right moment with smooth animations
 */

class HintManager {
    constructor() {
        this.hintQueue = [];
        this.currentHint = null;
        this.shownHints = new Set();
        this.enabled = true;
        this.hintElement = null;
        this.translations = {};
        
        this.initializeHintElement();
        this.loadHintHistory();
    }
    
    initializeHintElement() {
        // Create hint container
        this.hintElement = document.createElement('div');
        this.hintElement.id = 'hint-display';
        this.hintElement.className = 'hint-container hidden';
        
        // Add to body
        document.body.appendChild(this.hintElement);
        
        console.log('[HintManager] Initialized');
    }
    
    loadHintHistory() {
        // Load previously shown hints from localStorage
        try {
            const history = localStorage.getItem('rts_shown_hints');
            if (history) {
                this.shownHints = new Set(JSON.parse(history));
                console.log(`[HintManager] Loaded ${this.shownHints.size} shown hints from history`);
            }
        } catch (error) {
            console.warn('[HintManager] Failed to load hint history:', error);
        }
    }
    
    saveHintHistory() {
        // Save shown hints to localStorage
        try {
            localStorage.setItem('rts_shown_hints', JSON.stringify([...this.shownHints]));
        } catch (error) {
            console.warn('[HintManager] Failed to save hint history:', error);
        }
    }
    
    setTranslations(translations) {
        this.translations = translations;
    }
    
    translate(key) {
        return this.translations[key] || key;
    }
    
    showHint(hintKey, options = {}) {
        if (!this.enabled) return;
        
        // Check if hint was already shown (unless force is true)
        if (!options.force && this.shownHints.has(hintKey)) {
            return;
        }
        
        // Default options
        const config = {
            duration: 3000, // 3 seconds
            priority: 0,    // Higher priority = shown first
            force: false,   // Show even if already shown
            position: 'center', // 'center', 'top', 'bottom'
            ...options
        };
        
        // Add to queue with priority
        this.hintQueue.push({ key: hintKey, config });
        this.hintQueue.sort((a, b) => b.config.priority - a.config.priority);
        
        // Mark as shown
        this.shownHints.add(hintKey);
        this.saveHintHistory();
        
        // Show if no current hint
        if (!this.currentHint) {
            this.displayNext();
        }
    }
    
    displayNext() {
        if (this.hintQueue.length === 0) {
            this.currentHint = null;
            return;
        }
        
        const { key, config } = this.hintQueue.shift();
        this.currentHint = { key, config };
        
        // Get translated text
        const text = this.translate(key);
        
        // Update hint element
        this.hintElement.textContent = text;
        this.hintElement.className = `hint-container ${config.position}`;
        
        // Fade in
        setTimeout(() => {
            this.hintElement.classList.add('visible');
        }, 50);
        
        // Auto-hide after duration
        setTimeout(() => {
            this.hide();
        }, config.duration);
        
        console.log(`[HintManager] Showing hint: ${key}`);
    }
    
    hide() {
        if (!this.hintElement) return;
        
        // Fade out
        this.hintElement.classList.remove('visible');
        
        // Wait for animation, then show next
        setTimeout(() => {
            this.displayNext();
        }, 500); // Match CSS transition duration
    }
    
    enable() {
        this.enabled = true;
        console.log('[HintManager] Hints enabled');
    }
    
    disable() {
        this.enabled = false;
        this.hide();
        console.log('[HintManager] Hints disabled');
    }
    
    toggle() {
        this.enabled = !this.enabled;
        if (!this.enabled) {
            this.hide();
        }
        return this.enabled;
    }
    
    reset() {
        // Clear history and show all hints again
        this.shownHints.clear();
        this.saveHintHistory();
        console.log('[HintManager] Hint history reset');
    }
    
    // Contextual hint triggers
    onGameStart() {
        this.showHint('hint.game.welcome', { priority: 10, duration: 4000 });
        setTimeout(() => {
            this.showHint('hint.game.build_barracks', { priority: 9, duration: 4000 });
        }, 4500);
    }
    
    onFirstUnitSelected() {
        this.showHint('hint.controls.movement', { priority: 8 });
    }
    
    onFirstBuildingPlaced() {
        this.showHint('hint.game.train_units', { priority: 7 });
    }
    
    onMultipleUnitsSelected(count) {
        if (count >= 3) {
            this.showHint('hint.controls.control_groups', { priority: 6 });
        }
    }
    
    onLowCredits() {
        this.showHint('hint.game.low_credits', { priority: 5 });
    }
    
    onLowPower() {
        this.showHint('hint.game.low_power', { priority: 5 });
    }
    
    onFirstCombat() {
        this.showHint('hint.combat.attack_move', { priority: 7 });
    }
    
    onControlGroupAssigned() {
        this.showHint('hint.controls.control_groups_select', { priority: 6, duration: 4000 });
    }
    
    onCameraKeyboard() {
        this.showHint('hint.controls.camera_keyboard', { priority: 4 });
    }
    
    onLanguageChanged() {
        this.showHint('hint.ui.language_changed', { priority: 8, duration: 2000 });
    }
}

// Export for use in game.js
if (typeof module !== 'undefined' && module.exports) {
    module.exports = HintManager;
}