/**
 * DialogueSystem.js
 * =================
 * KRVAVA ŽETEV - NPC Dialogue & Conversation System
 * 
 * Features:
 * - Dynamic dialogue trees with choices
 * - Character portraits and emotions
 * - Quest integration (dialogue can trigger/complete quests)
 * - Relationship tracking (affects dialogue options)
 * - Twin Bond special dialogues (Ana's voice)
 * - Memory system (NPCs remember past conversations)
 * 
 * @author NovaFarma Team
 * @date 2025-12-23
 */

export default class DialogueSystem {
    constructor(scene) {
        this.scene = scene;

        // Active dialogue state
        this.currentDialogue = null;
        this.currentSpeaker = null;
        this.currentNode = null;
        this.dialogueHistory = new Map(); // NPC ID -> conversation history

        // UI elements
        this.dialogueBox = null;
        this.portraitSprite = null;
        this.nameText = null;
        this.dialogueText = null;
        this.choicesContainer = null;

        // Dialogue database
        this.dialogues = new Map(); // Dialogue ID -> dialogue data

        // Callbacks
        this.onDialogueComplete = null;
        this.onChoiceMade = null;

        console.log('💬 DialogueSystem initialized');
    }

    /**
     * Register a dialogue tree
     * @param {string} dialogueId - Unique identifier
     * @param {object} dialogueData - Tree structure
     */
    registerDialogue(dialogueId, dialogueData) {
        this.dialogues.set(dialogueId, dialogueData);
        console.log(`💬 Registered dialogue: ${dialogueId}`);
    }

    /**
     * Start a dialogue with an NPC
     * @param {string} dialogueId - Which dialogue to start
     * @param {object} speaker - NPC or character data
     * @param {function} onComplete - Callback when done
     */
    startDialogue(dialogueId, speaker, onComplete) {
        const dialogueData = this.dialogues.get(dialogueId);

        if (!dialogueData) {
            console.error(`Dialogue not found: ${dialogueId}`);
            return;
        }

        this.currentDialogue = dialogueData;
        this.currentSpeaker = speaker;
        this.onDialogueComplete = onComplete;

        // Show UI
        this.createDialogueUI();

        // Start at root node
        this.showNode(dialogueData.root || 'start');

        // Pause game
        this.scene.physics.pause();

        console.log(`💬 Started dialogue: ${dialogueId} with ${speaker.name}`);
    }

    /**
     * Show a specific dialogue node
     * @param {string} nodeId - Node to display
     */
    showNode(nodeId) {
        const node = this.currentDialogue.nodes[nodeId];

        if (!node) {
            console.error(`Node not found: ${nodeId}`);
            this.endDialogue();
            return;
        }

        this.currentNode = node;

        // Update speaker info
        const speaker = node.speaker || this.currentSpeaker.name;
        const emotion = node.emotion || 'neutral';

        this.updateSpeaker(speaker, emotion);

        // Show text with typewriter effect
        this.typewriterText(node.text);

        // Show choices or continue button
        if (node.choices && node.choices.length > 0) {
            this.showChoices(node.choices);
        } else if (node.next) {
            this.showContinueButton(node.next);
        } else {
            // End of dialogue
            this.showContinueButton('END');
        }

        // Execute node actions
        if (node.action) {
            this.executeNodeAction(node.action);
        }

        // Record in history
        this.addToHistory(nodeId, node.text);
    }

    /**
     * Create dialogue UI
     */
    createDialogueUI() {
        const width = this.scene.cameras.main.width;
        const height = this.scene.cameras.main.height;

        // Container for everything
        this.dialogueContainer = this.scene.add.container(0, 0);
        this.dialogueContainer.setDepth(1000);

        // Dark overlay
        const overlay = this.scene.add.rectangle(0, 0, width, height, 0x000000, 0.5);
        overlay.setOrigin(0);
        overlay.setInteractive();
        this.dialogueContainer.add(overlay);

        // Dialogue box
        const boxY = height - 200;
        const boxHeight = 180;

        this.dialogueBox = this.scene.add.rectangle(
            width / 2, boxY,
            width - 80, boxHeight,
            0x2d1b00, 0.95
        );
        this.dialogueBox.setStrokeStyle(3, 0xd4a574);
        this.dialogueContainer.add(this.dialogueBox);

        // Portrait background
        this.portraitBg = this.scene.add.rectangle(100, boxY, 100, 100, 0x4a3520, 0.9);
        this.portraitBg.setStrokeStyle(2, 0xd4a574);
        this.dialogueContainer.add(this.portraitBg);

        // Portrait
        this.portraitSprite = this.scene.add.text(100, boxY, '👤', {
            fontSize: '64px'
        });
        this.portraitSprite.setOrigin(0.5);
        this.dialogueContainer.add(this.portraitSprite);

        // Speaker name
        this.nameText = this.scene.add.text(170, boxY - 70, '', {
            fontSize: '20px',
            fontFamily: 'Georgia, serif',
            color: '#FFD700',
            fontStyle: 'bold',
            stroke: '#000000',
            strokeThickness: 3
        });
        this.dialogueContainer.add(this.nameText);

        // Dialogue text
        this.dialogueText = this.scene.add.text(170, boxY - 40, '', {
            fontSize: '18px',
            fontFamily: 'Georgia, serif',
            color: '#f4e4c1',
            wordWrap: { width: width - 280 },
            lineSpacing: 6
        });
        this.dialogueContainer.add(this.dialogueText);

        // Choices container
        this.choicesContainer = this.scene.add.container(width / 2, boxY + 120);
        this.dialogueContainer.add(this.choicesContainer);
    }

    /**
     * Update speaker display
     */
    updateSpeaker(name, emotion) {
        this.nameText.setText(name);

        // Get portrait based on speaker and emotion
        const portrait = this.getPortrait(name, emotion);
        this.portraitSprite.setText(portrait);
    }

    /**
     * Get portrait emoji
     */
    getPortrait(speaker, emotion) {
        // Kai portraits
        if (speaker === 'Kai' || speaker === 'You') {
            const kaiEmotions = {
                'neutral': '👨',
                'happy': '😊',
                'sad': '😢',
                'angry': '😠',
                'worried': '😟',
                'shocked': '😱',
                'determined': '😤'
            };
            return kaiEmotions[emotion] || '👨';
        }

        // Ana portraits (Twin Bond - ghostly)
        if (speaker === 'Ana' || speaker === 'Ana (Twin Bond)') {
            const anaEmotions = {
                'neutral': '👻',
                'happy': '😇',
                'sad': '😰',
                'worried': '😨',
                'pain': '😣',
                'help': '🆘'
            };
            return anaEmotions[emotion] || '👻';
        }

        // Other NPCs
        const npcPortraits = {
            'Grok': '🧘',
            'Elder': '👴',
            'Blacksmith': '🔨',
            'Baker': '🍞',
            'Doctor': '⚕️',
            'Merchant': '💰',
            'Stranger': '❓',
            'Zombie': '🧟'
        };

        return npcPortraits[speaker] || '👤';
    }

    /**
     * Typewriter text effect
     */
    typewriterText(text) {
        let displayText = '';
        let charIndex = 0;

        this.dialogueText.setText('');

        const timer = this.scene.time.addEvent({
            delay: 30,
            callback: () => {
                if (charIndex < text.length) {
                    displayText += text[charIndex];
                    this.dialogueText.setText(displayText);
                    charIndex++;
                } else {
                    timer.remove();
                }
            },
            loop: true
        });
    }

    /**
     * Show dialogue choices
     */
    showChoices(choices) {
        this.choicesContainer.removeAll(true);

        choices.forEach((choice, index) => {
            // Check if choice is available
            if (choice.condition && !this.checkCondition(choice.condition)) {
                return; // Skip this choice
            }

            const y = index * 50;

            // Choice button background
            const btn = this.scene.add.rectangle(0, y, 600, 40, 0x6b4423, 1);
            btn.setStrokeStyle(2, 0xd4a574);
            btn.setInteractive({ useHandCursor: true });

            // Choice text
            const text = this.scene.add.text(0, y, choice.text, {
                fontSize: '16px',
                fontFamily: 'Georgia, serif',
                color: '#f4e4c1',
                fontStyle: 'bold'
            });
            text.setOrigin(0.5);

            // Hover effects
            btn.on('pointerover', () => {
                btn.setFillStyle(0x8b5a3c);
                text.setColor('#FFD700');
            });

            btn.on('pointerout', () => {
                btn.setFillStyle(0x6b4423);
                text.setColor('#f4e4c1');
            });

            // Click handler
            btn.on('pointerdown', () => {
                this.onChoiceSelected(choice);
            });

            this.choicesContainer.add([btn, text]);
        });
    }

    /**
     * Show continue button
     */
    showContinueButton(nextNode) {
        this.choicesContainer.removeAll(true);

        const continueBtn = this.scene.add.text(0, 0, '▼ Continue (SPACE)', {
            fontSize: '16px',
            fontFamily: 'Georgia, serif',
            color: '#888888'
        });
        continueBtn.setOrigin(0.5);

        // Pulse animation
        this.scene.tweens.add({
            targets: continueBtn,
            alpha: 0.3,
            duration: 800,
            yoyo: true,
            repeat: -1
        });

        this.choicesContainer.add(continueBtn);

        // Space key or click to continue
        const spaceKey = this.scene.input.keyboard.addKey('SPACE');
        spaceKey.once('down', () => {
            if (nextNode === 'END') {
                this.endDialogue();
            } else {
                this.showNode(nextNode);
            }
        });
    }

    /**
     * Handle choice selection
     */
    onChoiceSelected(choice) {
        console.log(`💬 Choice selected: ${choice.text}`);

        // Execute choice action
        if (choice.action) {
            this.executeNodeAction(choice.action);
        }

        // Callback
        if (this.onChoiceMade) {
            this.onChoiceMade(choice);
        }

        // Go to next node
        if (choice.next) {
            this.showNode(choice.next);
        } else {
            this.endDialogue();
        }
    }

    /**
     * Execute node action
     */
    executeNodeAction(action) {
        switch (action.type) {
            case 'quest_start':
                this.scene.questSystem?.startQuest(action.questId);
                break;

            case 'quest_complete':
                this.scene.questSystem?.completeQuest(action.questId);
                break;

            case 'give_item':
                this.scene.inventorySystem?.addItem(action.itemId, action.amount);
                break;

            case 'take_item':
                this.scene.inventorySystem?.removeItem(action.itemId, action.amount);
                break;

            case 'relationship_change':
                this.changeRelationship(action.npcId, action.amount);
                break;

            case 'custom':
                if (action.callback) {
                    action.callback(this.scene);
                }
                break;
        }
    }

    /**
     * Check if condition is met
     */
    checkCondition(condition) {
        switch (condition.type) {
            case 'quest_active':
                return this.scene.questSystem?.isQuestActive(condition.questId);

            case 'quest_complete':
                return this.scene.questSystem?.isQuestComplete(condition.questId);

            case 'has_item':
                return this.scene.inventorySystem?.hasItem(condition.itemId, condition.amount);

            case 'relationship':
                return this.getRelationship(condition.npcId) >= condition.value;

            case 'custom':
                return condition.check(this.scene);

            default:
                return true;
        }
    }

    /**
     * Add to conversation history
     */
    addToHistory(nodeId, text) {
        const speakerId = this.currentSpeaker.id || this.currentSpeaker.name;

        if (!this.dialogueHistory.has(speakerId)) {
            this.dialogueHistory.set(speakerId, []);
        }

        this.dialogueHistory.get(speakerId).push({
            nodeId: nodeId,
            text: text,
            timestamp: Date.now()
        });
    }

    /**
     * Relationship tracking
     */
    changeRelationship(npcId, amount) {
        // TODO: Integrate with proper relationship system
        console.log(`💕 Relationship with ${npcId}: ${amount > 0 ? '+' : ''}${amount}`);
    }

    getRelationship(npcId) {
        // TODO: Get from relationship system
        return 0;
    }

    /**
     * End dialogue
     */
    endDialogue() {
        console.log('💬 Dialogue ended');

        // Clean up UI
        if (this.dialogueContainer) {
            this.dialogueContainer.destroy();
        }

        // Resume game
        this.scene.physics.resume();

        // Callback
        if (this.onDialogueComplete) {
            this.onDialogueComplete();
        }

        // Reset state
        this.currentDialogue = null;
        this.currentSpeaker = null;
        this.currentNode = null;
        this.onDialogueComplete = null;
    }

    /**
     * Check if dialogue is active
     */
    isActive() {
        return this.currentDialogue !== null;
    }
}