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src/modules/visual-generation/services/veo-video.service.ts

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+// Veo Video Service - AI-powered video generation
+// Path: src/modules/visual-generation/services/veo-video.service.ts
+
+import { Injectable, Logger } from '@nestjs/common';
+
+export interface VideoGenerationRequest {
+    prompt: string;
+    duration?: VideoDuration;
+    aspectRatio?: VideoAspectRatio;
+    style?: VideoStyle;
+    motion?: MotionType;
+    audio?: AudioOptions;
+    platform?: string;
+}
+
+export type VideoDuration = '5s' | '10s' | '15s' | '30s' | '60s';
+
+export type VideoAspectRatio = '1:1' | '9:16' | '16:9' | '4:5';
+
+export type VideoStyle =
+    | 'cinematic'
+    | 'documentary'
+    | 'animated'
+    | 'motion_graphics'
+    | 'time_lapse'
+    | 'slow_motion'
+    | 'hyperlapse'
+    | 'stopmotion'
+    | 'vlog'
+    | 'corporate';
+
+export type MotionType =
+    | 'static'
+    | 'pan_left'
+    | 'pan_right'
+    | 'zoom_in'
+    | 'zoom_out'
+    | 'dolly_in'
+    | 'dolly_out'
+    | 'orbit'
+    | 'tilt_up'
+    | 'tilt_down';
+
+export interface AudioOptions {
+    music?: MusicStyle;
+    voiceover?: boolean;
+    soundEffects?: boolean;
+}
+
+export type MusicStyle =
+    | 'upbeat'
+    | 'calm'
+    | 'dramatic'
+    | 'corporate'
+    | 'inspirational'
+    | 'electronic'
+    | 'acoustic'
+    | 'none';
+
+export interface GeneratedVideo {
+    id: string;
+    prompt: string;
+    url: string;
+    thumbnailUrl: string;
+    duration: VideoDuration;
+    aspectRatio: VideoAspectRatio;
+    style: VideoStyle;
+    resolution: VideoResolution;
+    fps: number;
+    fileSize: number; // in bytes
+    metadata: VideoMetadata;
+    status: VideoStatus;
+    createdAt: Date;
+}
+
+export interface VideoResolution {
+    width: number;
+    height: number;
+    quality: '720p' | '1080p' | '4k';
+}
+
+export interface VideoMetadata {
+    model: string;
+    generationTime: number;
+    frames: number;
+    hasAudio: boolean;
+    audioTrack?: string;
+    tags: string[];
+}
+
+export type VideoStatus = 'queued' | 'processing' | 'completed' | 'failed';
+
+export interface VideoScene {
+    order: number;
+    duration: string;
+    prompt: string;
+    motion?: MotionType;
+    transition?: TransitionType;
+}
+
+export type TransitionType =
+    | 'cut'
+    | 'fade'
+    | 'dissolve'
+    | 'wipe'
+    | 'zoom'
+    | 'slide';
+
+@Injectable()
+export class VeoVideoService {
+    private readonly logger = new Logger(VeoVideoService.name);
+
+    // Platform-specific video defaults
+    private readonly platformDefaults: Record<string, {
+        duration: VideoDuration;
+        aspectRatio: VideoAspectRatio;
+        style: VideoStyle;
+    }> = {
+            tiktok: { duration: '15s', aspectRatio: '9:16', style: 'vlog' },
+            instagram_reel: { duration: '15s', aspectRatio: '9:16', style: 'cinematic' },
+            instagram_story: { duration: '10s', aspectRatio: '9:16', style: 'motion_graphics' },
+            youtube_short: { duration: '30s', aspectRatio: '9:16', style: 'vlog' },
+            youtube: { duration: '60s', aspectRatio: '16:9', style: 'cinematic' },
+            linkedin: { duration: '30s', aspectRatio: '16:9', style: 'corporate' },
+            twitter: { duration: '15s', aspectRatio: '16:9', style: 'motion_graphics' },
+        };
+
+    // Style prompt modifiers
+    private readonly styleModifiers: Record<VideoStyle, string> = {
+        cinematic: 'cinematic quality, film-like, dramatic lighting, professional',
+        documentary: 'documentary style, authentic, natural lighting, storytelling',
+        animated: 'animated, cartoon style, vibrant colors, fun',
+        motion_graphics: 'motion graphics, smooth transitions, modern design, clean',
+        time_lapse: 'time-lapse, accelerated motion, passage of time',
+        slow_motion: 'slow motion, detailed, dramatic, fluid movement',
+        hyperlapse: 'hyperlapse, dynamic movement, urban, travel',
+        stopmotion: 'stop motion animation, creative, artistic',
+        vlog: 'vlog style, personal, casual, authentic',
+        corporate: 'corporate style, professional, clean, business-oriented',
+    };
+
+    /**
+     * Generate a video
+     */
+    async generateVideo(request: VideoGenerationRequest): Promise<GeneratedVideo> {
+        const {
+            prompt,
+            duration = '15s',
+            aspectRatio = '9:16',
+            style = 'cinematic',
+            motion = 'static',
+            audio,
+            platform,
+        } = request;
+
+        // Apply platform defaults
+        let finalDuration = duration;
+        let finalRatio = aspectRatio;
+        let finalStyle = style;
+
+        if (platform && this.platformDefaults[platform]) {
+            const defaults = this.platformDefaults[platform];
+            finalDuration = defaults.duration;
+            finalRatio = defaults.aspectRatio;
+            finalStyle = defaults.style;
+        }
+
+        // Get resolution based on aspect ratio
+        const resolution = this.getResolution(finalRatio);
+        const frames = this.calculateFrames(finalDuration);
+
+        // Mock generation (in production, this would call Veo API)
+        const video: GeneratedVideo = {
+            id: `vid-${Date.now()}`,
+            prompt,
+            url: `https://storage.example.com/videos/${Date.now()}.mp4`,
+            thumbnailUrl: `https://storage.example.com/videos/${Date.now()}_thumb.jpg`,
+            duration: finalDuration,
+            aspectRatio: finalRatio,
+            style: finalStyle,
+            resolution,
+            fps: 30,
+            fileSize: this.estimateFileSize(finalDuration, resolution),
+            metadata: {
+                model: 'veo-2.0',
+                generationTime: 15000 + Math.random() * 10000,
+                frames,
+                hasAudio: !!audio?.music || !!audio?.voiceover,
+                audioTrack: audio?.music,
+                tags: this.extractTags(prompt),
+            },
+            status: 'completed',
+            createdAt: new Date(),
+        };
+
+        this.logger.log(`Generated video: ${video.id}`);
+        return video;
+    }
+
+    /**
+     * Generate video from image (image-to-video)
+     */
+    async imageToVideo(
+        imageUrl: string,
+        motion: MotionType = 'zoom_in',
+        duration: VideoDuration = '5s',
+    ): Promise<GeneratedVideo> {
+        return this.generateVideo({
+            prompt: `Animate image with ${motion} motion`,
+            duration,
+            motion,
+        });
+    }
+
+    /**
+     * Generate multi-scene video
+     */
+    async generateMultiSceneVideo(
+        scenes: VideoScene[],
+        audio?: AudioOptions,
+    ): Promise<GeneratedVideo> {
+        const totalDuration = scenes.reduce((sum, scene) => {
+            const seconds = parseInt(scene.duration.replace('s', ''));
+            return sum + seconds;
+        }, 0);
+
+        const combinedPrompt = scenes.map((s) => s.prompt).join(' | ');
+
+        return this.generateVideo({
+            prompt: combinedPrompt,
+            duration: `${totalDuration}s` as VideoDuration,
+            audio,
+        });
+    }
+
+    /**
+     * Get video generation status
+     */
+    async getVideoStatus(videoId: string): Promise<{
+        status: VideoStatus;
+        progress: number;
+        estimatedRemaining?: number;
+    }> {
+        // Mock status check
+        return {
+            status: 'completed',
+            progress: 100,
+        };
+    }
+
+    /**
+     * Get platform recommendations
+     */
+    getPlatformRecommendations(platform: string): {
+        duration: VideoDuration;
+        aspectRatio: VideoAspectRatio;
+        style: VideoStyle;
+        tips: string[];
+    } | null {
+        const defaults = this.platformDefaults[platform];
+        if (!defaults) return null;
+
+        return {
+            ...defaults,
+            tips: this.getPlatformTips(platform),
+        };
+    }
+
+    /**
+     * Get available styles
+     */
+    getStyles(): { style: VideoStyle; description: string }[] {
+        return Object.entries(this.styleModifiers).map(([style, description]) => ({
+            style: style as VideoStyle,
+            description: description.split(',')[0],
+        }));
+    }
+
+    /**
+     * Get available motions
+     */
+    getMotions(): { motion: MotionType; description: string }[] {
+        const descriptions: Record<MotionType, string> = {
+            static: 'No camera movement',
+            pan_left: 'Camera pans from right to left',
+            pan_right: 'Camera pans from left to right',
+            zoom_in: 'Camera zooms in towards subject',
+            zoom_out: 'Camera zooms out from subject',
+            dolly_in: 'Camera moves forward',
+            dolly_out: 'Camera moves backward',
+            orbit: 'Camera orbits around subject',
+            tilt_up: 'Camera tilts upward',
+            tilt_down: 'Camera tilts downward',
+        };
+
+        return Object.entries(descriptions).map(([motion, description]) => ({
+            motion: motion as MotionType,
+            description,
+        }));
+    }
+
+    // Private helper methods
+
+    private getResolution(aspectRatio: VideoAspectRatio): VideoResolution {
+        const resolutions: Record<VideoAspectRatio, VideoResolution> = {
+            '1:1': { width: 1080, height: 1080, quality: '1080p' },
+            '9:16': { width: 1080, height: 1920, quality: '1080p' },
+            '16:9': { width: 1920, height: 1080, quality: '1080p' },
+            '4:5': { width: 1080, height: 1350, quality: '1080p' },
+        };
+        return resolutions[aspectRatio];
+    }
+
+    private calculateFrames(duration: VideoDuration): number {
+        const seconds = parseInt(duration.replace('s', ''));
+        return seconds * 30; // 30 fps
+    }
+
+    private estimateFileSize(duration: VideoDuration, resolution: VideoResolution): number {
+        const seconds = parseInt(duration.replace('s', ''));
+        const baseSize = resolution.quality === '4k' ? 50 : resolution.quality === '1080p' ? 20 : 10;
+        return seconds * baseSize * 1024 * 1024; // MB to bytes
+    }
+
+    private extractTags(prompt: string): string[] {
+        const words = prompt.toLowerCase().split(/\s+/);
+        return words.filter((w) => w.length > 3).slice(0, 10);
+    }
+
+    private getPlatformTips(platform: string): string[] {
+        const tips: Record<string, string[]> = {
+            tiktok: [
+                'Hook viewers in first 3 seconds',
+                'Use trending sounds',
+                'Include text overlays',
+                'End with a loop-friendly transition',
+            ],
+            instagram_reel: [
+                'Start with an attention-grabbing moment',
+                'Use vertical format fully',
+                'Add captions for sound-off viewing',
+                'Keep it under 30 seconds for best engagement',
+            ],
+            youtube_short: [
+                'Vertical format required',
+                'First 2 seconds are critical',
+                'Add a clear CTA',
+                'Hashtags help discovery',
+            ],
+            linkedin: [
+                'Keep professional tone',
+                'Add captions (most watch on mute)',
+                'Lead with value',
+                'Optimal length: 30-90 seconds',
+            ],
+        };
+
+        return tips[platform] || ['Optimize for the platform guidelines'];
+    }
+}