/**
 * HordeWaveSystem.js
 * ==================
 * KRVAVA ŽETEV - Horde Mode Wave Manager
 * 
 * Features:
 * - Wave spawning system
 * - Difficulty scaling
 * - Enemy type pools
 * - Boss waves
 * - Rewards
 * 
 * @author NovaFarma Team
 * @date 2025-12-23
 */

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

        // Wave state
        this.currentWave = 0;
        this.isWaveActive = false;
        this.waveStartTime = 0;
        this.enemiesRemaining = 0;
        this.enemiesKilled = 0;

        // Spawn points
        this.spawnPoints = [];
        this.spawnRadius = 500; // Pixels from player

        // Wave definitions
        this.waves = [];

        // Statistics
        this.stats = {
            totalWavesCompleted: 0,
            totalEnemiesKilled: 0,
            highestWave: 0,
            totalRewards: 0
        };

        console.log('🌊 HordeWaveSystem initialized');

        // Generate wave definitions
        this.generateWaves();
    }

    /**
     * Generate infinite wave definitions
     */
    generateWaves() {
        // Pre-generate 100 waves (can generate more on-demand)
        for (let i = 1; i <= 100; i++) {
            this.waves.push(this.generateWave(i));
        }

        console.log(`✅ Generated ${this.waves.length} wave definitions`);
    }

    /**
     * Generate single wave definition
     */
    generateWave(waveNumber) {
        const wave = {
            number: waveNumber,
            enemies: [],
            isBossWave: waveNumber % 10 === 0, // Every 10th wave is boss
            rewards: {
                zlatniki: 10 * waveNumber,
                xp: 50 * waveNumber,
                items: []
            }
        };

        // Boss wave
        if (wave.isBossWave) {
            wave.enemies = this.generateBossWave(waveNumber);
        } else {
            // Normal wave
            wave.enemies = this.generateNormalWave(waveNumber);
        }

        return wave;
    }

    /**
     * Generate normal wave enemies
     */
    generateNormalWave(waveNumber) {
        const enemies = [];

        // Base enemy count scales with wave
        const baseCount = 5 + Math.floor(waveNumber * 1.5);

        // Enemy types unlock progressively
        const availableTypes = this.getAvailableEnemyTypes(waveNumber);

        for (let i = 0; i < baseCount; i++) {
            const enemyType = Phaser.Utils.Array.GetRandom(availableTypes);
            const enemy = {
                type: enemyType.id,
                health: enemyType.baseHealth * (1 + waveNumber * 0.1), // +10% HP per wave
                damage: enemyType.baseDamage * (1 + waveNumber * 0.05), // +5% damage per wave
                speed: enemyType.baseSpeed,
                spawnDelay: i * 500 // Stagger spawns
            };
            enemies.push(enemy);
        }

        return enemies;
    }

    /**
     * Generate boss wave
     */
    generateBossWave(waveNumber) {
        const enemies = [];

        // Boss
        const bossLevel = Math.floor(waveNumber / 10);
        const boss = {
            type: 'boss_zombie',
            health: 1000 * bossLevel,
            damage: 50 * bossLevel,
            speed: 80,
            isBoss: true,
            spawnDelay: 0
        };
        enemies.push(boss);

        // Add minions (scales with boss level)
        const minionCount = 5 + (bossLevel * 2);
        for (let i = 0; i < minionCount; i++) {
            const minion = {
                type: 'elite_zombie',
                health: 200 * bossLevel,
                damage: 20 * bossLevel,
                speed: 120,
                spawnDelay: 1000 + (i * 500)
            };
            enemies.push(minion);
        }

        return enemies;
    }

    /**
     * Get available enemy types for wave
     */
    getAvailableEnemyTypes(waveNumber) {
        const types = [
            // Tier 1: Waves 1-5
            { id: 'basic_zombie', tier: 1, baseHealth: 100, baseDamage: 10, baseSpeed: 80 },
            { id: 'crawler_zombie', tier: 1, baseHealth: 80, baseDamage: 15, baseSpeed: 100 },

            // Tier 2: Waves 6-15
            { id: 'runner_zombie', tier: 2, baseHealth: 120, baseDamage: 12, baseSpeed: 150 },
            { id: 'spitter_zombie', tier: 2, baseHealth: 90, baseDamage: 20, baseSpeed: 70 },

            // Tier 3: Waves 16-30
            { id: 'tank_zombie', tier: 3, baseHealth: 300, baseDamage: 25, baseSpeed: 60 },
            { id: 'exploder_zombie', tier: 3, baseHealth: 150, baseDamage: 50, baseSpeed: 90 },

            // Tier 4: Waves 31-50
            { id: 'mutant_zombie', tier: 4, baseHealth: 500, baseDamage: 40, baseSpeed: 110 },
            { id: 'alpha_zombie', tier: 4, baseHealth: 800, baseDamage: 60, baseSpeed: 100 },

            // Tier 5: Waves 51+
            { id: 'nightmare_zombie', tier: 5, baseHealth: 1200, baseDamage: 80, baseSpeed: 130 },
            { id: 'omega_zombie', tier: 5, baseHealth: 2000, baseDamage: 100, baseSpeed: 120 }
        ];

        // Filter by tier
        let availableTier = 1;
        if (waveNumber >= 51) availableTier = 5;
        else if (waveNumber >= 31) availableTier = 4;
        else if (waveNumber >= 16) availableTier = 3;
        else if (waveNumber >= 6) availableTier = 2;

        return types.filter(t => t.tier <= availableTier);
    }

    /**
     * Start wave
     */
    startWave(waveNumber = null) {
        if (this.isWaveActive) {
            console.log('⚠️ Wave already active!');
            return false;
        }

        // Use next wave if not specified
        if (waveNumber === null) {
            waveNumber = this.currentWave + 1;
        }

        // Generate more waves if needed
        if (waveNumber > this.waves.length) {
            for (let i = this.waves.length + 1; i <= waveNumber; i++) {
                this.waves.push(this.generateWave(i));
            }
        }

        const wave = this.waves[waveNumber - 1];
        if (!wave) {
            console.error(`Wave ${waveNumber} not found!`);
            return false;
        }

        this.currentWave = waveNumber;
        this.isWaveActive = true;
        this.waveStartTime = Date.now();
        this.enemiesRemaining = wave.enemies.length;
        this.enemiesKilled = 0;

        console.log(`🌊 Wave ${waveNumber} ${wave.isBossWave ? '👑 BOSS ' : ''}starting!`);
        console.log(`   Enemies: ${wave.enemies.length}`);

        // Spawn enemies
        this.spawnWaveEnemies(wave);

        // Show wave notification
        this.showNotification({
            title: wave.isBossWave ? '👑 BOSS WAVE!' : `Wave ${waveNumber}`,
            text: `${wave.enemies.length} enemies incoming!`,
            icon: '🌊'
        });

        return true;
    }

    /**
     * Spawn wave enemies
     */
    spawnWaveEnemies(wave) {
        wave.enemies.forEach(enemy => {
            setTimeout(() => {
                this.spawnEnemy(enemy);
            }, enemy.spawnDelay || 0);
        });
    }

    /**
     * Spawn single enemy
     */
    spawnEnemy(enemyData) {
        // Get spawn point (random around player)
        const spawnPoint = this.getRandomSpawnPoint();

        // TODO: Create actual enemy sprite
        console.log(`👾 Spawning ${enemyData.type} at (${spawnPoint.x}, ${spawnPoint.y})`);

        // Create enemy using ZombieSystem or EnemySystem
        // For now, just log
        const enemy = {
            ...enemyData,
            x: spawnPoint.x,
            y: spawnPoint.y,
            isAlive: true,
            currentHealth: enemyData.health
        };

        // TODO: Add to enemy tracking

        return enemy;
    }

    /**
     * Get random spawn point
     */
    getRandomSpawnPoint() {
        const playerX = this.scene.player?.x || 0;
        const playerY = this.scene.player?.y || 0;

        // Random angle
        const angle = Math.random() * Math.PI * 2;

        // Spawn at radius distance
        const x = playerX + Math.cos(angle) * this.spawnRadius;
        const y = playerY + Math.sin(angle) * this.spawnRadius;

        return { x, y };
    }

    /**
     * Enemy killed callback
     */
    onEnemyKilled(enemy) {
        if (!this.isWaveActive) return;

        this.enemiesKilled++;
        this.enemiesRemaining--;
        this.stats.totalEnemiesKilled++;

        console.log(`💀 Enemy killed! (${this.enemiesKilled}/${this.currentWave ? this.waves[this.currentWave - 1].enemies.length : 0})`);

        // Check if wave complete
        if (this.enemiesRemaining <= 0) {
            this.completeWave();
        }
    }

    /**
     * Complete wave
     */
    completeWave() {
        if (!this.isWaveActive) return;

        const wave = this.waves[this.currentWave - 1];
        const duration = Date.now() - this.waveStartTime;

        this.isWaveActive = false;
        this.stats.totalWavesCompleted++;
        this.stats.highestWave = Math.max(this.stats.highestWave, this.currentWave);

        console.log(`✅ Wave ${this.currentWave} complete!`);
        console.log(`   Time: ${Math.floor(duration / 1000)}s`);
        console.log(`   Killed: ${this.enemiesKilled}`);

        // Grant rewards
        this.grantWaveRewards(wave);

        // Show completion notification
        this.showNotification({
            title: 'Wave Complete!',
            text: `✅ Wave ${this.currentWave} cleared! Rewards granted!`,
            icon: '🏆'
        });

        // Auto-start next wave after delay
        setTimeout(() => {
            this.showWaveCountdown();
        }, 5000);
    }

    /**
     * Grant wave rewards
     */
    grantWaveRewards(wave) {
        const rewards = wave.rewards;

        console.log(`🎁 Rewards:`);
        console.log(`   💰 ${rewards.zlatniki} Zlatniki`);
        console.log(`   ⭐ ${rewards.xp} XP`);

        // TODO: Actually grant rewards to player
        this.stats.totalRewards += rewards.zlatniki;

        // Rare loot on boss waves
        if (wave.isBossWave) {
            console.log(`   👑 BONUS: Boss loot!`);
            // TODO: Grant rare items
        }
    }

    /**
     * Show wave countdown
     */
    showWaveCountdown() {
        const nextWave = this.currentWave + 1;

        console.log(`⏰ Next wave (${nextWave}) in 10 seconds...`);

        this.showNotification({
            title: 'Next Wave Soon',
            text: `⏰ Wave ${nextWave} starts in 10 seconds!`,
            icon: '⚔️'
        });

        // Auto-start after countdown
        setTimeout(() => {
            this.startWave(nextWave);
        }, 10000);
    }

    /**
     * End horde mode
     */
    endHordeMode() {
        this.isWaveActive = false;

        console.log('🛑 Horde mode ended');
        console.log('📊 Final Stats:');
        console.log(`   Waves: ${this.stats.totalWavesCompleted}`);
        console.log(`   Kills: ${this.stats.totalEnemiesKilled}`);
        console.log(`   Highest: ${this.stats.highestWave}`);

        this.showNotification({
            title: 'Horde Mode Ended',
            text: `Survived ${this.stats.highestWave} waves! ${this.stats.totalEnemiesKilled} kills!`,
            icon: '🏆'
        });
    }

    /**
     * Get wave info
     */
    getWaveInfo(waveNumber) {
        return this.waves[waveNumber - 1];
    }

    /**
     * Get statistics
     */
    getStats() {
        return {
            ...this.stats,
            currentWave: this.currentWave,
            isActive: this.isWaveActive
        };
    }

    /**
     * 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) {
        if (!this.isWaveActive) return;

        // Update wave timer, check conditions, etc.
        // TODO: Implement wave updates
    }
}