/**
 * MicroFarmExpansionSystem.js
 * ============================
 * KRVAVA ŽETEV - Micro Farm & Expansion System (Phase 37)
 * 
 * Features:
 * - 8x8 starting micro farm
 * - Expansion system (2x2 tiles at a time)
 * - Land type mechanics (Grass, Forest, Rocky, Swamp)
 * - Zombie clearing crews
 * - Resource costs
 * - Tutorial integration
 * 
 * @author NovaFarma Team
 * @date 2025-12-23
 */

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

        // Farm grid (tile-based)
        this.farmSize = { width: 8, height: 8 }; // Starting size
        this.maxSize = { width: 64, height: 64 }; // Maximum farm size
        this.tileSize = 48; // Pixels per tile

        // Expansion state
        this.unlockedTiles = new Set();
        this.expansionQueue = [];

        // Land types
        this.landTypes = new Map();

        // Tutorial state
        this.tutorialComplete = false;
        this.tutorialStep = 0;

        console.log('🌾 MicroFarmExpansionSystem initialized');

        // Initialize starting farm
        this.initializeStartingFarm();

        // Register land types
        this.registerLandTypes();
    }

    /**
     * Initialize 8x8 starting micro farm
     */
    initializeStartingFarm() {
        const centerX = Math.floor(this.maxSize.width / 2);
        const centerY = Math.floor(this.maxSize.height / 2);

        // Unlock center 8x8 area
        for (let x = centerX - 4; x < centerX + 4; x++) {
            for (let y = centerY - 4; y < centerY + 4; y++) {
                const tileKey = `${x},${y}`;
                this.unlockedTiles.add(tileKey);

                // Mark as grass (cleared)
                this.landTypes.set(tileKey, {
                    type: 'grass',
                    cleared: true,
                    fertility: 100
                });
            }
        }

        console.log(`✅ Micro farm initialized: 8x8 tiles (64 tiles total)`);
        console.log(`   Center: (${centerX}, ${centerY})`);

        // Show starting area
        this.visualizeFarm();

        // Start tutorial
        this.startTutorial();
    }

    /**
     * Register land types
     */
    registerLandTypes() {
        // Land type definitions
        const types = {
            grass: {
                name: 'Grass',
                icon: '🌿',
                clearingRequired: false,
                clearingCost: { zlatniki: 0 },
                fertility: 100
            },
            forest: {
                name: 'Forest',
                icon: '🌲',
                clearingRequired: true,
                clearingCost: { zlatniki: 50, wood: 0 }, // Get wood from clearing
                clearingTask: 'chop_trees',
                clearingTime: 60, // seconds
                fertility: 80
            },
            rocky: {
                name: 'Rocky',
                icon: '⛰️',
                clearingRequired: true,
                clearingCost: { zlatniki: 100, stone: 0 }, // Get stone from clearing
                clearingTask: 'mine_rocks',
                clearingTime: 90,
                fertility: 50
            },
            swamp: {
                name: 'Swamp',
                icon: '💧',
                clearingRequired: true,
                clearingCost: { zlatniki: 150 },
                clearingTask: 'drain_water',
                clearingTime: 120,
                fertility: 90 // High fertility after drainage!
            }
        };

        console.log(`✅ Registered ${Object.keys(types).length} land types`);
    }

    /**
     * Expand farm by 2x2 area
     */
    expandFarm(direction) {
        const expansionSize = 2; // Expand by 2x2 tiles
        const cost = this.calculateExpansionCost(direction);

        // Check if player can afford
        if (!this.canAffordExpansion(cost)) {
            this.showNotification({
                title: 'Cannot Expand',
                text: `Need ${cost.zlatniki}Ž, ${cost.wood || 0} Wood, ${cost.stone || 0} Stone`,
                icon: '💰'
            });
            return false;
        }

        // Get expansion tiles
        const newTiles = this.getExpansionTiles(direction, expansionSize);

        if (newTiles.length === 0) {
            this.showNotification({
                title: 'Cannot Expand',
                text: 'Maximum farm size reached or invalid direction!',
                icon: '🚫'
            });
            return false;
        }

        // Pay cost
        this.payExpansionCost(cost);

        // Add to expansion queue
        this.queueExpansion(newTiles);

        console.log(`🌾 Expanding farm ${direction}: +${newTiles.length} tiles`);

        this.showNotification({
            title: 'Expansion Started!',
            text: `🌾 Expanding ${direction}! Send zombies to clear the land!`,
            icon: '🚜'
        });

        return true;
    }

    /**
     * Get tiles for expansion
     */
    getExpansionTiles(direction, size) {
        const tiles = [];
        const bounds = this.getCurrentBounds();

        switch (direction) {
            case 'north':
                for (let x = bounds.minX; x <= bounds.maxX; x++) {
                    for (let y = bounds.minY - size; y < bounds.minY; y++) {
                        tiles.push({ x, y });
                    }
                }
                break;

            case 'south':
                for (let x = bounds.minX; x <= bounds.maxX; x++) {
                    for (let y = bounds.maxY + 1; y <= bounds.maxY + size; y++) {
                        tiles.push({ x, y });
                    }
                }
                break;

            case 'east':
                for (let x = bounds.maxX + 1; x <= bounds.maxX + size; x++) {
                    for (let y = bounds.minY; y <= bounds.maxY; y++) {
                        tiles.push({ x, y });
                    }
                }
                break;

            case 'west':
                for (let x = bounds.minX - size; x < bounds.minX; x++) {
                    for (let y = bounds.minY; y <= bounds.maxY; y++) {
                        tiles.push({ x, y });
                    }
                }
                break;
        }

        // Filter out already unlocked tiles
        return tiles.filter(tile => !this.unlockedTiles.has(`${tile.x},${tile.y}`));
    }

    /**
     * Get current farm bounds
     */
    getCurrentBounds() {
        let minX = Infinity, minY = Infinity;
        let maxX = -Infinity, maxY = -Infinity;

        this.unlockedTiles.forEach(tileKey => {
            const [x, y] = tileKey.split(',').map(Number);
            minX = Math.min(minX, x);
            minY = Math.min(minY, y);
            maxX = Math.max(maxX, x);
            maxY = Math.max(maxY, y);
        });

        return { minX, minY, maxX, maxY };
    }

    /**
     * Calculate expansion cost
     */
    calculateExpansionCost(direction) {
        const baseZlatniki = 100;
        const currentSize = this.unlockedTiles.size;

        // Cost increases with farm size
        const zlatniki = baseZlatniki + Math.floor(currentSize / 10) * 50;

        return {
            zlatniki: zlatniki,
            wood: 10,
            stone: 5
        };
    }

    /**
     * Check if player can afford expansion
     */
    canAffordExpansion(cost) {
        // TODO: Check actual player resources
        // For now, return true
        return true;
    }

    /**
     * Pay expansion cost
     */
    payExpansionCost(cost) {
        console.log(`💰 Paid: ${cost.zlatniki}Ž, ${cost.wood} Wood, ${cost.stone} Stone`);
        // TODO: Actually deduct from player inventory
    }

    /**
     * Queue expansion for zombie clearing
     */
    queueExpansion(tiles) {
        tiles.forEach(tile => {
            const tileKey = `${tile.x},${tile.y}`;

            // Randomly assign land type
            const landType = this.getRandomLandType();

            this.landTypes.set(tileKey, {
                type: landType,
                cleared: landType === 'grass', // Grass is pre-cleared
                fertility: this.getLandTypeFertility(landType),
                clearingProgress: 0
            });

            this.expansionQueue.push({
                tileKey: tileKey,
                tile: tile,
                landType: landType,
                status: 'queued'
            });
        });

        console.log(`📋 Queued ${tiles.length} tiles for expansion`);
    }

    /**
     * Get random land type
     */
    getRandomLandType() {
        const types = ['grass', 'forest', 'rocky', 'swamp'];
        const weights = [40, 30, 20, 10]; // Grass more common

        const total = weights.reduce((a, b) => a + b, 0);
        let random = Math.random() * total;

        for (let i = 0; i < types.length; i++) {
            random -= weights[i];
            if (random <= 0) return types[i];
        }

        return 'grass';
    }

    /**
     * Get land type fertility
     */
    getLandTypeFertility(type) {
        const fertility = {
            grass: 100,
            forest: 80,
            rocky: 50,
            swamp: 90
        };
        return fertility[type] || 100;
    }

    /**
     * Send zombies to clear land
     */
    sendZombiesToClear(tileKey, zombieIds) {
        const land = this.landTypes.get(tileKey);
        if (!land) {
            console.error(`Tile ${tileKey} not found!`);
            return false;
        }

        if (land.cleared) {
            console.log(`Tile ${tileKey} already cleared!`);
            return false;
        }

        console.log(`🧟 Sending ${zombieIds.length} zombies to clear ${land.type} at ${tileKey}`);

        // Set zombies to clearing task
        // TODO: Integrate with ZombieSystem

        // Start clearing progress
        land.clearingProgress = 0;
        land.clearingZombies = zombieIds;
        land.clearingStartTime = Date.now();

        return true;
    }

    /**
     * Update clearing progress
     */
    updateClearingProgress(delta) {
        this.landTypes.forEach((land, tileKey) => {
            if (!land.cleared && land.clearingZombies) {
                // Progress based on number of zombies
                const zombieCount = land.clearingZombies.length;
                const progressRate = zombieCount * 0.01; // 1% per zombie per second

                land.clearingProgress += progressRate * (delta / 1000);

                // Check if complete
                if (land.clearingProgress >= 100) {
                    this.completeLandClearing(tileKey);
                }
            }
        });
    }

    /**
     * Complete land clearing
     */
    completeLandClearing(tileKey) {
        const land = this.landTypes.get(tileKey);
        if (!land) return;

        land.cleared = true;
        land.clearingProgress = 100;
        land.clearingZombies = null;

        // Add tile to unlocked
        this.unlockedTiles.add(tileKey);

        // Grant clearing rewards
        this.grantClearingRewards(land.type);

        console.log(`✅ Land cleared: ${tileKey} (${land.type})`);

        this.showNotification({
            title: 'Land Cleared!',
            text: `✅ ${this.getLandTypeIcon(land.type)} ${land.type} tile ready for farming!`,
            icon: '🎉'
        });
    }

    /**
     * Grant clearing rewards
     */
    grantClearingRewards(landType) {
        const rewards = {
            forest: { wood: 10 },
            rocky: { stone: 15 },
            swamp: { clay: 5 }
        };

        const reward = rewards[landType];
        if (reward) {
            console.log(`🎁 Clearing rewards:`, reward);
            // TODO: Add to inventory
        }
    }

    /**
     * Get land type icon
     */
    getLandTypeIcon(type) {
        const icons = {
            grass: '🌿',
            forest: '🌲',
            rocky: '⛰️',
            swamp: '💧'
        };
        return icons[type] || '❓';
    }

    /**
     * Tutorial system
     */
    startTutorial() {
        this.tutorialStep = 1;

        this.showNotification({
            title: 'Welcome to Your Micro Farm!',
            text: '🌾 You start with an 8x8 plot. Expand by clearing surrounding land!',
            icon: '📚'
        });

        // TODO: Show tutorial UI with steps
    }

    /**
     * Visualize farm (console)
     */
    visualizeFarm() {
        const bounds = this.getCurrentBounds();

        console.log('🌾 FARM MAP:');
        for (let y = bounds.minY; y <= bounds.maxY; y++) {
            let row = '';
            for (let x = bounds.minX; x <= bounds.maxX; x++) {
                const tileKey = `${x},${y}`;
                if (this.unlockedTiles.has(tileKey)) {
                    const land = this.landTypes.get(tileKey);
                    row += land.cleared ? '✅' : '⏳';
                } else {
                    row += '🔒';
                }
            }
            console.log(row);
        }
    }

    /**
     * Get farm info
     */
    getFarmInfo() {
        return {
            unlockedTiles: this.unlockedTiles.size,
            bounds: this.getCurrentBounds(),
            expansionQueue: this.expansionQueue.length,
            tutorialComplete: this.tutorialComplete
        };
    }

    /**
     * Helper: Show notification
     */
    showNotification(notification) {
        console.log(`📢 ${notification.icon} ${notification.title}: ${notification.text}`);

        const ui = this.scene.scene.get('UIScene');
        if (ui && ui.showNotification) {
            ui.showNotification(notification);
        }
    }

    /**
     * Update system
     */
    update(delta) {
        // Update clearing progress
        this.updateClearingProgress(delta);
    }
}