// Preload Scene - Nalaganje assetov
class PreloadScene extends Phaser.Scene {
    constructor() {
        super({ key: 'PreloadScene' });
    }

    preload() {
        console.log('⏳ PreloadScene: Loading MINIMAL assets for DEMO...');

        this.createLoadingBar();

        // ═══════════════════════════════════════════════════════════════
        // 🎵 AUDIO PRELOAD - Cinematic Voices
        // ═══════════════════════════════════════════════════════════════
        this.preloadAudio();

        // ═══════════════════════════════════════════════════════════════
        // 🎨 CHARACTER SPRITES - Demo Characters
        // ═══════════════════════════════════════════════════════════════
        this.preloadCharacterSprites();

        // ═══════════════════════════════════════════════════════════════
        // 🎮 DEMO MODE - ALL OLD ASSETS DISABLED!
        // ═══════════════════════════════════════════════════════════════
        // DemoSceneEnhanced has its own preload() - ne rabimo ničesar!
        // This PreloadScene samo pokazuje loading bar in gre v DemoSceneEnhanced

        console.log('✅ Minimal preload complete - DemoSceneEnhanced will load its own assets!');
    }

    preloadCharacterSprites() {
        console.log('🎨 Preloading character sprites...');

        const basePath = 'assets/references/main_characters/';

        // Kai sprites
        this.loadImageSafe('kai_idle', basePath + 'kai/animations/idle/kai_idle_frame1.png');
        this.loadImageSafe('kai_walk', basePath + 'kai/animations/walk/kai_walk_frame1.png');

        // Ana sprites  
        this.loadImageSafe('ana_idle', basePath + 'ana/animations/idle/ana_idle_frame1.png');
        this.loadImageSafe('ana_walk', basePath + 'ana/animations/walk/ana_walk_frame1.png');

        // Susi (companion)
        this.loadImageSafe('susi_idle', 'assets/references/companions/susi/animations/idle/susi_idle_frame1.png');
        this.loadImageSafe('susi_run', 'assets/references/companions/susi/animations/run/susi_run_frame1.png');

        console.log('🎨 Character sprites queued');
    }

    loadImageSafe(key, path) {
        try {
            this.load.image(key, path);
        } catch (error) {
            console.warn(`⚠️  Image skipped: ${key}`);
        }
    }

    preloadAudio() {
        console.log('🎵 Preloading audio assets...');

        const basePath = 'assets/audio/voices/';

        // 🎬 INTRO CUTSCENE VOICES (NEW!)
        this.loadAudioSafe('intro_flyover', 'assets/audio/voiceover/intro/01_narrator_flyover.mp3');
        this.loadAudioSafe('intro_awakening', 'assets/audio/voiceover/intro/02_kai_awakening.mp3');
        this.loadAudioSafe('intro_truth_1', 'assets/audio/voiceover/intro/03_kai_truth_part1.mp3');
        this.loadAudioSafe('intro_truth_2', 'assets/audio/voiceover/intro/04_kai_truth_part2.mp3');

        // Narrator (cinematic)
        this.loadAudioSafe('narrator_intro', basePath + 'narrator/intro_cutscene.mp3');
        this.loadAudioSafe('narrator_memory', basePath + 'narrator/kai_memory_ana.mp3');
        this.loadAudioSafe('narrator_discovery', basePath + 'narrator/discovery_church.mp3');

        // Kai voices
        this.loadAudioSafe('kai_voice_1', basePath + 'kai/kai_01.mp3');
        this.loadAudioSafe('kai_voice_2', basePath + 'kai/kai_02.mp3');
        this.loadAudioSafe('kai_voice_3', basePath + 'kai/kai_03.mp3');
        this.loadAudioSafe('kai_voice_4', basePath + 'kai/kai_04.mp3');
        this.loadAudioSafe('kai_voice_5', basePath + 'kai/kai_05.mp3');

        // Ana voices
        this.loadAudioSafe('ana_voice_1', basePath + 'ana/ana_01.mp3');
        this.loadAudioSafe('ana_voice_2', basePath + 'ana/ana_02.mp3');
        this.loadAudioSafe('ana_voice_3', basePath + 'ana/ana_03.mp3');
        this.loadAudioSafe('ana_voice_4', basePath + 'ana/ana_04.mp3');

        console.log('🎵 Audio preload queued');
    }

    loadAudioSafe(key, path) {
        try {
            this.load.audio(key, path);
        } catch (error) {
            console.warn(`⚠️  Audio skipped: ${key}`);
        }
    }

    createAnimations() {
        if (this.anims.exists('protagonist_walk')) return;

        // Zombie animations (only if texture exists)
        if (this.textures.exists('zombie_walk')) {
            this.anims.create({
                key: 'zombie_walk_anim',
                frames: this.anims.generateFrameNumbers('zombie_walk', { start: 0, end: 5 }),
                frameRate: 8,
                repeat: -1
            });
        } else {
            console.warn('⚠️ Texture "zombie_walk" not found - skipping animation');
        }

        this.anims.create({
            key: 'zombie_worker_walk',
            frames: this.anims.generateFrameNumbers('zombie_worker', { start: 0, end: 5 }),
            frameRate: 8,
            repeat: -1
        });

        // KRVAVA ŽETEV: Protagonist 4-directional walking animations
        // Row 1: DOWN (frames 0-3)
        this.anims.create({
            key: 'protagonist_walk_down',
            frames: this.anims.generateFrameNumbers('player_protagonist', { start: 0, end: 3 }),
            frameRate: 8,
            repeat: -1
        });

        // Row 2: LEFT (frames 4-7)
        this.anims.create({
            key: 'protagonist_walk_left',
            frames: this.anims.generateFrameNumbers('player_protagonist', { start: 4, end: 7 }),
            frameRate: 8,
            repeat: -1
        });

        // Row 3: RIGHT (frames 8-11)
        this.anims.create({
            key: 'protagonist_walk_right',
            frames: this.anims.generateFrameNumbers('player_protagonist', { start: 8, end: 11 }),
            frameRate: 8,
            repeat: -1
        });

        // Row 4: UP (frames 12-15)
        this.anims.create({
            key: 'protagonist_walk_up',
            frames: this.anims.generateFrameNumbers('player_protagonist', { start: 12, end: 15 }),
            frameRate: 8,
            repeat: -1
        });

        // IDLE: Use first frame of each direction
        this.anims.create({
            key: 'protagonist_idle_down',
            frames: [{ key: 'player_protagonist', frame: 0 }],
            frameRate: 1
        });

        this.anims.create({
            key: 'protagonist_idle_left',
            frames: [{ key: 'player_protagonist', frame: 4 }],
            frameRate: 1
        });

        this.anims.create({
            key: 'protagonist_idle_right',
            frames: [{ key: 'player_protagonist', frame: 8 }],
            frameRate: 1
        });

        this.anims.create({
            key: 'protagonist_idle_up',
            frames: [{ key: 'player_protagonist', frame: 12 }],
            frameRate: 1
        });

        console.log('🎞️ Animations created!');
    }

    processAllTransparency() {
        // Process ALL sprites to remove backgrounds
        const spritesToProcess = [
            'player_sprite',
            'zombie_sprite',
            'merchant_sprite',
            'house_sprite',
            'stone_sprite',
            'tree_sprite',
            'grass_sprite',
            'leaf_sprite',
            'wheat_sprite',
            'stone_texture',
            // New pixel art assets
            'flowers',
            'tree_green',
            'tree_blue',
            'tree_dead',
            'rock_asset',

            // FINAL TREES
            'tree_green_final',
            'tree_blue_final',
            'tree_dead_final',

            // STARDEW VALLEY FOREST TREES
            'tree_purple',
            'tree_apple',
            'tree_pear',
            'tree_cherry',
            'tree_sapling',

            // NEW transparent assets
            'tree_blue_new',
            'tree_green_new',
            'rock_1',
            'rock_2',
            'rock_small',
            'merchant_new',
            'elite_zombie',
            'tree_dead_new',
            'flowers_new',
            'hill_sprite',
            'fence',
            'fence_old',
            'gravestone',
            // City content
            'chest',
            'spawner',
            'signpost_city',
            'signpost_farm',
            'signpost_both',
            // Voxel stil
            'tree_voxel_green',
            'tree_voxel_blue',
            'tree_voxel_dead',
            'rock_voxel',

            // NEW ISOMETRIC 2.5D ASSETS - Remove transparency
            'barn_isometric',
            'farmhouse_isometric',
            'fence_isometric',
            'bridge_isometric',
            'blacksmith_workshop',
            'ruins_building',
            'soil_tilled',
            'carrots_stages',
            'flowers_pink_isometric',
            // NOTE: player_dreadlocks and zombie_worker are SPRITESHEETS - don't process!
            'grave_zombie',

            // NEW FENCE PIECES
            'fence_post',
            'fence_horizontal',
            'fence_vertical',
            'fence_corner',

            // ANIMALS & NPCs
            'chicken',
            'cow',
            'cow_mutant',
            'elf',
            'troll',
            'villager',
            'npc_merchant',
            'npc_zombie',

            // STRUCTURES
            'structure_house',
            'wall_damaged',
            'city_wall',

            // MISC OBJECTS
            'wheat_sprite',
            'grass_sprite',
            'leaf_sprite',
            'stone_sprite'

            // 🌳 TREES REMOVED - already have transparent PNG!
            // (green removal would delete green leaves!)
        ];

        spritesToProcess.forEach(spriteKey => {
            this.processSpriteTransparency(spriteKey);
        });

        // ULTRA AGGRESSIVE: Fence Post only
        if (this.textures.exists('fence_post')) {
            this.ultraRemoveBackground('fence_post');
        }

        // ULTRA REMOVED - new tree sprites already have transparency!
        // if (this.textures.exists('cesnjevo_drevo')) {
        //     this.ultraRemoveBackground('cesnjevo_drevo');
        // }

        console.log('✅ All sprites transparency processed!');
    }

    processSpriteTransparency(spriteKey) {
        if (!this.textures.exists(spriteKey)) return;

        const texture = this.textures.get(spriteKey);
        const source = texture.getSourceImage();

        // Create canvas to process image
        const canvas = document.createElement('canvas');
        canvas.width = source.width;
        canvas.height = source.height;
        const ctx = canvas.getContext('2d', { willReadFrequently: true });

        // Draw original image
        ctx.drawImage(source, 0, 0);

        // Get image data
        const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
        const data = imageData.data;

        // Remove backgrounds - ULTRA AGGRESSIVE MODE!
        for (let i = 0; i < data.length; i += 4) {
            const r = data[i];
            const g = data[i + 1];
            const b = data[i + 2];
            const a = data[i + 3];

            // Skip if already transparent
            if (a === 0) continue;

            const brightness = (r + g + b) / 3;

            // 🟢 GREEN REMOVAL - Only BRIGHT greens!
            // Pink (255,105,180) has g=105 - MUST KEEP!
            // Bright green (0,255,0) has g=255 - REMOVE!
            const isGreen = (
                g > 180 &&  // Only very bright green
                g > r * 1.3 &&  // Green dominates red
                g > b * 1.3     // Green dominates blue
            );
            if (isGreen) {
                data[i + 3] = 0;
                continue;
            }

            // 1. Remove ALL grayscale colors (ANY shade of gray)
            const isGrayscale = Math.abs(r - g) < 20 && Math.abs(g - b) < 20 && Math.abs(r - b) < 20;
            if (isGrayscale && brightness > 80) {
                data[i + 3] = 0; // Make transparent
                continue;
            }

            // 2. Remove ALL light/bright backgrounds (AI-generated sprites)
            if (brightness > 150) {
                data[i + 3] = 0; // Make transparent
                continue;
            }

            // 3. Remove PURE WHITE
            if (r > 240 && g > 240 && b > 240) {
                data[i + 3] = 0;
                continue;
            }

            // 4. Remove OFF-WHITE / CREAM / BEIGE
            if (brightness > 200 && Math.abs(r - g) < 30 && Math.abs(g - b) < 30) {
                data[i + 3] = 0;
                continue;
            }

            // 5. Remove PASTEL colors (low saturation, high brightness)
            const maxRGB = Math.max(r, g, b);
            const minRGB = Math.min(r, g, b);
            const saturation = maxRGB === 0 ? 0 : (maxRGB - minRGB) / maxRGB;

            if (saturation < 0.3 && brightness > 120) {
                data[i + 3] = 0; // Remove low-saturation backgrounds
                continue;
            }

            // Special: Remove brown/tan backgrounds (merchant sprite)
            if (spriteKey === 'merchant_sprite') {
                // Brown detection: R > G > B, warm tones
                const isBrown = r > 100 && r > g && g > b && (r - b) > 40;
                if (isBrown) {
                    data[i + 3] = 0;
                }
            }
        }

        // Put processed data back
        ctx.putImageData(imageData, 0, 0);

        // Create new texture from processed canvas
        this.textures.remove(spriteKey);
        this.textures.addCanvas(spriteKey, canvas);
    }

    createLoadingBar() {
        const width = this.cameras.main.width;
        const height = this.cameras.main.height;

        // Warm background (Stardew Valley style)
        const bg = this.add.graphics();
        bg.fillStyle(0x2d1b00, 1);
        bg.fillRect(0, 0, width, height);

        // Simple "LOADING" text
        const title = this.add.text(width / 2, height / 2 - 80, 'LOADING', {
            fontFamily: 'Georgia, serif',
            fontSize: '36px',
            fontStyle: 'bold',
            fill: '#f4e4c1',
            stroke: '#2d1b00',
            strokeThickness: 4
        }).setOrigin(0.5);

        // Progress Bar container (wooden style)
        const barWidth = 400;
        const barHeight = 30;
        const barX = width / 2 - barWidth / 2;
        const barY = height / 2;

        const progressBox = this.add.graphics();
        progressBox.fillStyle(0x4a3520, 0.9);
        progressBox.fillRoundedRect(barX, barY, barWidth, barHeight, 5);
        progressBox.lineStyle(3, 0xd4a574, 1);
        progressBox.strokeRoundedRect(barX, barY, barWidth, barHeight, 5);

        const progressBar = this.add.graphics();

        // Zombie sprite walking on the bar
        const zombie = this.add.text(barX, barY + barHeight / 2, '🧟', {
            fontSize: '32px'
        }).setOrigin(0.5);

        // Percentage text
        const percentText = this.add.text(width / 2, barY + barHeight / 2, '0%', {
            font: '16px Georgia',
            fill: '#f4e4c1',
            fontStyle: 'bold'
        }).setOrigin(0.5);

        this.load.on('progress', (value) => {
            percentText.setText(parseInt(value * 100) + '%');
            progressBar.clear();
            progressBar.fillStyle(0x6b4423, 1);

            // Smooth fill
            const w = (barWidth - 10) * value;
            if (w > 0) {
                progressBar.fillRoundedRect(barX + 5, barY + 5, w, barHeight - 10, 2);
            }

            // Move zombie along the bar (moderate speed)
            const zombieX = barX + (barWidth * value);
            zombie.setX(zombieX);

            // Gentle bounce animation
            const bounce = Math.sin(value * 20) * 3;
            zombie.setY(barY + barHeight / 2 + bounce);
        });

        this.load.on('complete', () => {
            // Fade out animation
            this.tweens.add({
                targets: [progressBar, progressBox, percentText, title, zombie, bg],
                alpha: 0,
                duration: 800,
                onComplete: () => {
                    progressBar.destroy();
                    progressBox.destroy();
                    percentText.destroy();
                    title.destroy();
                    zombie.destroy();
                    bg.destroy(); // Ensure bg is destroyed here
                    console.log('✅ PreloadScene: Assets loaded!');
                    window.gameState.currentScene = 'PreloadScene';

                    // ✅ Starting main menu (StoryScene)
                    this.time.delayedCall(500, () => {
                        console.log('🎮 Starting StoryScene (Main Menu)...');
                        this.scene.start('StoryScene'); // ← MAIN MENU
                    });
                }
            });
        });
    }

    create() {
        // The actual scene start logic has been moved to the 'load.on(complete)' callback
        // to ensure all assets are fully loaded and the loading bar has faded out.
        // This 'create' method now primarily serves as a placeholder or for any
        // immediate setup that doesn't depend on asset loading completion.
    }

    processPlayerSpritesheet() {
        const spriteKey = 'player_protagonist';

        if (!this.textures.exists(spriteKey)) {
            console.warn('⚠️ Player protagonist texture not found!');
            return;
        }

        console.log('🎨 Processing player spritesheet transparency...');

        const texture = this.textures.get(spriteKey);
        const source = texture.getSourceImage();

        const canvas = document.createElement('canvas');
        canvas.width = source.width;
        canvas.height = source.height;
        const ctx = canvas.getContext('2d', { willReadFrequently: true });

        ctx.drawImage(source, 0, 0);
        const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
        const data = imageData.data;

        // ULTRA AGGRESSIVE: Remove ALL checkerboard patterns and gray backgrounds
        for (let i = 0; i < data.length; i += 4) {
            const r = data[i];
            const g = data[i + 1];
            const b = data[i + 2];
            const a = data[i + 3];

            // Skip if already transparent
            if (a === 0) continue;

            // 1. Remove PERFECT GRAY (checkerboard pattern: RGB 204,204,204 and 153,153,153)
            if (r === g && g === b) {
                if (r === 204 || r === 153 || r === 192 || r === 128 || (r >= 180 && r <= 210)) {
                    data[i + 3] = 0;
                    continue;
                }
            }

            // 2. Remove ANY grayscale (R≈G≈B within 15 units)
            const isGrayscale = Math.abs(r - g) < 15 && Math.abs(g - b) < 15 && Math.abs(r - b) < 15;
            const brightness = (r + g + b) / 3;

            if (isGrayscale && brightness > 100) {
                data[i + 3] = 0;
                continue;
            }

            // 3. Remove LIGHT backgrounds (brightness > 150)
            if (brightness > 150) {
                data[i + 3] = 0;
                continue;
            }

            // 4. Keep ONLY colored pixels (character skin, clothing, hair)
            // Character has: blue hoodie, brown pants, brown skin
            const maxChannel = Math.max(r, g, b);
            const minChannel = Math.min(r, g, b);
            const saturation = maxChannel === 0 ? 0 : (maxChannel - minChannel) / maxChannel;

            // If low saturation AND bright = background
            if (saturation < 0.15 && brightness > 80) {
                data[i + 3] = 0;
                continue;
            }
        }

        ctx.putImageData(imageData, 0, 0);

        // Replace texture
        this.textures.remove(spriteKey);
        this.textures.addCanvas(spriteKey, canvas);

        console.log('✅ Player spritesheet transparency processed!');
    }

    ultraRemoveBackground(spriteKey) {
        if (!this.textures.exists(spriteKey)) return;

        const texture = this.textures.get(spriteKey);
        const source = texture.getSourceImage();

        const canvas = document.createElement('canvas');
        canvas.width = source.width;
        canvas.height = source.height;
        const ctx = canvas.getContext('2d', { willReadFrequently: true });

        ctx.drawImage(source, 0, 0);
        const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
        const data = imageData.data;

        // Different logic for different sprites
        if (spriteKey === 'cesnjevo_drevo') {
            // CHERRY BLOSSOM: Keep only PINK (flowers) and BROWN (trunk)
            for (let i = 0; i < data.length; i += 4) {
                const r = data[i];
                const g = data[i + 1];
                const b = data[i + 2];

                // Pink detection: R > G, R > B, pinkish tones
                const isPink = r > 100 && r > g && r > b && (r - g) > 30;

                // Brown detection: R > G > B, warm earthy tones
                const isBrown = r > g && g > b && r > 80 && r < 200;

                // Keep pink OR brown, remove everything else
                if (!isPink && !isBrown) {
                    data[i + 3] = 0; // Make transparent
                }
            }
        } else {
            // FALLBACK: Fence post logic (keep only brown)
            for (let i = 0; i < data.length; i += 4) {
                const r = data[i];
                const g = data[i + 1];
                const b = data[i + 2];

                // Keep only brown/wood colors: R > G > B and R is dominant
                const isBrown = r > g && g > b && r > 80 && r < 200;

                if (!isBrown) {
                    data[i + 3] = 0; // Make transparent
                }
            }
        }

        ctx.putImageData(imageData, 0, 0);

        // Remove old texture and create new one from canvas
        this.textures.remove(spriteKey);
        this.textures.addCanvas(spriteKey, canvas);

        console.log(`🔥 ULTRA removed background from ${spriteKey}`);
    }
}