/**
 * QuestSystemExpanded.js
 * =======================
 * KRVAVA ŽETEV - Enhanced Quest System for Main Campaign
 * 
 * Extends the original QuestSystem to support:
 * - Act-based quest structure
 * - Location-based objectives
 * - Dialogue integration
 * - Event triggers
 * - Quest chains
 * - Bond strength rewards
 * 
 * @author NovaFarma Team
 * @date 2025-12-23
 */

class QuestSystemExpanded {
    constructor(scene) {
        this.scene = scene;

        // Load Act 1 Quest Data
        this.questDB = typeof Act1QuestData !== 'undefined' ? Act1QuestData : {};

        // Quest state
        this.activeQuests = new Map(); // questId -> quest instance
        this.completedQuests = new Set();
        this.questHistory = [];

        // Current main quest
        this.mainQuest = null;

        // UI reference
        this.questUI = null;

        console.log('📜 QuestSystemExpanded initialized');
        console.log(`📚 Loaded ${Object.keys(this.questDB).length} quests`);
    }

    /**
     * Start a quest
     */
    startQuest(questId) {
        if (this.completedQuests.has(questId)) {
            console.log(`⚠️ Quest already completed: ${questId}`);
            return false;
        }

        if (this.activeQuests.has(questId)) {
            console.log(`⚠️ Quest already active: ${questId}`);
            return false;
        }

        const questTemplate = this.questDB[questId];
        if (!questTemplate) {
            console.error(`❌ Quest not found: ${questId}`);
            return false;
        }

        // Create quest instance (deep copy)
        const quest = JSON.parse(JSON.stringify(questTemplate));
        quest.startTime = Date.now();
        quest.status = 'active';

        // Add to active quests
        this.activeQuests.set(questId, quest);

        // If main quest, set as current
        if (quest.isMainQuest) {
            this.mainQuest = quest;
        }

        // Show start dialogue
        if (quest.startDialogue) {
            this.showQuestDialogue(quest.startDialogue);
        }

        // Trigger any start events
        if (quest.triggerEvent) {
            this.triggerQuestEvent(quest.triggerEvent);
        }

        // Notification
        this.showQuestNotification({
            title: 'New Quest!',
            questTitle: quest.title,
            description: quest.description,
            icon: quest.isMainQuest ? '📖' : '📝'
        });

        // Update UI
        this.updateUI();

        console.log(`📜 Quest Started: ${quest.title} (${questId})`);

        // Emit event
        this.scene.events.emit('questStarted', { quest });

        return true;
    }

    /**
     * Complete a quest objective
     */
    completeObjective(questId, objectiveId) {
        const quest = this.activeQuests.get(questId);
        if (!quest) {
            console.warn(`Quest not active: ${questId}`);
            return false;
        }

        const objective = quest.objectives.find(obj => obj.id === objectiveId);
        if (!objective) {
            console.error(`Objective not found: ${objectiveId}`);
            return false;
        }

        if (objective.completed) {
            console.log(`Objective already complete: ${objectiveId}`);
            return false;
        }

        objective.completed = true;
        objective.completedTime = Date.now();

        console.log(`✅ Objective Complete: ${objective.description}`);

        // Show notification
        this.showObjectiveNotification(objective.description);

        // Check if all objectives complete
        const allComplete = quest.objectives.every(obj => obj.completed);
        if (allComplete) {
            this.completeQuest(questId);
        } else {
            // Update UI
            this.updateUI();
        }

        return true;
    }

    /**
     * Update objective progress
     */
    updateObjectiveProgress(questId, objectiveId, amount) {
        const quest = this.activeQuests.get(questId);
        if (!quest) return false;

        const objective = quest.objectives.find(obj => obj.id === objectiveId);
        if (!objective) return false;

        objective.current = Math.min(objective.required, objective.current + amount);

        // Check if objective complete
        if (objective.current >= objective.required && !objective.completed) {
            this.completeObjective(questId, objectiveId);
        } else {
            this.updateUI();
        }

        return true;
    }

    /**
     * Complete a quest
     */
    completeQuest(questId) {
        const quest = this.activeQuests.get(questId);
        if (!quest) {
            console.error(`Quest not active: ${questId}`);
            return false;
        }

        // Mark as completed
        quest.status = 'completed';
        quest.completeTime = Date.now();

        // Show completion dialogue
        if (quest.completeDialogue) {
            this.showQuestDialogue(quest.completeDialogue);
        }

        // Grant rewards
        if (quest.rewards) {
            this.grantRewards(quest.rewards);
        }

        // Move to completed
        this.activeQuests.delete(questId);
        this.completedQuests.add(questId);
        this.questHistory.push(quest);

        // Notification
        this.showQuestNotification({
            title: 'Quest Complete!',
            questTitle: quest.title,
            description: 'Rewards granted',
            icon: '🏆',
            color: '#FFD700'
        });

        // Start next quest if exists
        if (quest.nextQuest) {
            setTimeout(() => {
                this.startQuest(quest.nextQuest);
            }, 2000); // 2 second delay
        }

        // If main quest, clear it
        if (quest.isMainQuest) {
            this.mainQuest = null;
        }

        console.log(`🏆 Quest Complete: ${quest.title}`);

        // Emit event
        this.scene.events.emit('questCompleted', { quest });

        // Update UI
        this.updateUI();

        return true;
    }

    /**
     * Grant quest rewards
     */
    grantRewards(rewards) {
        // XP
        if (rewards.xp && this.scene.player) {
            this.scene.player.addXP?.(rewards.xp);
            console.log(`💫 Gained ${rewards.xp} XP`);
        }

        // Items
        if (rewards.items && this.scene.inventorySystem) {
            rewards.items.forEach(item => {
                this.scene.inventorySystem.addItem(item.id, item.amount);
                console.log(`📦 Received ${item.amount}x ${item.id}`);
            });
        }

        // Bond Strength
        if (rewards.bondStrength && this.scene.twinBondSystem) {
            this.scene.twinBondSystem.changeBondStrength(rewards.bondStrength);
            console.log(`💞 Bond Strength ${rewards.bondStrength > 0 ? '+' : ''}${rewards.bondStrength}`);
        }

        // Unlocks
        if (rewards.unlocks) {
            rewards.unlocks.forEach(unlock => {
                this.unlockFeature(unlock);
            });
        }
    }

    /**
     * Unlock feature/system
     */
    unlockFeature(featureId) {
        console.log(`🔓 Unlocked: ${featureId}`);

        switch (featureId) {
            case 'twin_bond_ui':
                if (this.scene.twinBondSystem) {
                    this.scene.twinBondSystem.createBondUI();
                }
                break;

            case 'zombie_commands':
                // Already available through ZombieSystem
                break;

            case 'grave_crafting':
                if (this.scene.recipeSystem) {
                    this.scene.recipeSystem.unlockRecipe('grave');
                }
                break;

            case 'act_2':
                console.log('🎬 ACT 2 UNLOCKED!');
                // TODO: Transition to Act 2
                break;
        }

        this.scene.events.emit('featureUnlocked', { featureId });
    }

    /**
     * Trigger quest event
     */
    triggerQuestEvent(event) {
        if (event.type === 'twin_bond_message' && this.scene.twinBondSystem) {
            setTimeout(() => {
                this.scene.twinBondSystem.showTelepathicMessage(
                    event.message,
                    event.emotion
                );
            }, event.delay || 0);
        }
    }

    /**
     * Show quest dialogue
     */
    showQuestDialogue(dialogue) {
        // Simple text display for now
        // TODO: Integrate with DialogueSystem
        console.log(`💬 ${dialogue.speaker}: ${dialogue.text}`);
    }

    /**
     * Show quest notification
     */
    showQuestNotification(notification) {
        const ui = this.scene.scene.get('UIScene');
        if (ui && ui.showNotification) {
            ui.showNotification(notification);
        } else {
            // Fallback
            console.log(`📢 ${notification.icon} ${notification.title}: ${notification.questTitle}`);
        }
    }

    /**
     * Show objective notification
     */
    showObjectiveNotification(description) {
        const ui = this.scene.scene.get('UIScene');
        if (ui && ui.showFloatingText) {
            ui.showFloatingText({
                x: this.scene.player?.x || 400,
                y: this.scene.player?.y - 50 || 300,
                text: `✓ ${description}`,
                color: '#00FF00'
            });
        }
    }

    /**
     * Check location objective
     */
    checkLocationObjective(questId, objectiveId, playerX, playerY) {
        const quest = this.activeQuests.get(questId);
        if (!quest) return false;

        const objective = quest.objectives.find(obj => obj.id === objectiveId);
        if (!objective || objective.type !== 'location') return false;

        const distance = Phaser.Math.Distance.Between(
            playerX, playerY,
            objective.target.x, objective.target.y
        );

        if (distance <= objective.target.radius) {
            this.completeObjective(questId, objectiveId);
            return true;
        }

        return false;
    }

    /**
     * Update (check objectives)
     */
    update(delta) {
        // Check location objectives for active quests
        if (this.scene.player) {
            const playerX = this.scene.player.x;
            const playerY = this.scene.player.y;

            this.activeQuests.forEach((quest, questId) => {
                quest.objectives.forEach(objective => {
                    if (objective.completed) return;

                    if (objective.type === 'location') {
                        this.checkLocationObjective(questId, objective.id, playerX, playerY);
                    }
                });
            });
        }
    }

    /**
     * Update UI
     */
    updateUI() {
        const ui = this.scene.scene.get('UIScene');
        if (ui && ui.updateQuestTracker) {
            ui.updateQuestTracker(this.mainQuest);
        }
    }

    /**
     * Getters
     */
    isQuestActive(questId) {
        return this.activeQuests.has(questId);
    }

    isQuestComplete(questId) {
        return this.completedQuests.has(questId);
    }

    getActiveQuests() {
        return Array.from(this.activeQuests.values());
    }

    getMainQuest() {
        return this.mainQuest;
    }

    getQuestProgress(questId) {
        const quest = this.activeQuests.get(questId);
        if (!quest) return null;

        const total = quest.objectives.length;
        const completed = quest.objectives.filter(obj => obj.completed).length;

        return {
            total,
            completed,
            percentage: Math.round((completed / total) * 100)
        };
    }
}