//! Video Processing Workflow Example
//! 
//! This example demonstrates a complete video processing workflow
//! using the template system for different types of video content.

use tvai::*;
use std::path::Path;
use std::time::Instant;

#[tokio::main]
async fn main() -> std::result::Result<(), Box<dyn std::error::Error>> {
    println!("=== Video Processing Workflow Demo ===\n");

    // Check if Topaz Video AI is available
    match detect_topaz_installation() {
        Some(path) => {
            println!("✓ Topaz Video AI found at: {:?}", path);
        }
        None => {
            println!("⚠ Topaz Video AI not found. This demo will show the workflow without actual processing.");
            println!("  Install Topaz Video AI to run actual video processing.\n");
        }
    }

    // List available templates
    println!("Available processing templates:");
    let templates = list_available_templates();
    for (i, template_name) in templates.iter().enumerate() {
        if let Some((name, description)) = get_template_info(template_name) {
            println!("  {}. {} ({})", i + 1, name, template_name);
            println!("     {}", description);
        }
    }
    println!();

    // Demonstrate different workflow scenarios
    demonstrate_upscaling_workflow().await?;
    demonstrate_frame_rate_workflow().await?;
    demonstrate_restoration_workflow().await?;
    demonstrate_creative_workflow().await?;
    demonstrate_batch_processing().await?;

    println!("=== Workflow Demo Complete ===");
    Ok(())
}

/// Demonstrate video upscaling workflow
async fn demonstrate_upscaling_workflow() -> std::result::Result<(), Box<dyn std::error::Error>> {
    println!("=== Upscaling Workflow ===");
    
    let input_path = Path::new("examples/sample_video.mp4");
    let output_path = Path::new("output/upscaled_4k.mp4");
    
    println!("Scenario: Upscaling a low-resolution video to 4K");
    println!("Input: {:?}", input_path);
    println!("Output: {:?}", output_path);
    println!("Template: upscale_to_4k");
    
    // Show what the template would do
    let manager = global_topaz_templates().lock().unwrap();
    if let Ok(applied) = manager.apply_template("upscale_to_4k") {
        println!("Processing parameters:");
        if let Some(upscale) = &applied.enhance_params.upscale {
            println!("  • Scale factor: {}x", upscale.scale_factor);
            println!("  • AI Model: {:?}", upscale.model);
            println!("  • Quality preset: {:?}", upscale.quality_preset);
            println!("  • Compression: {}", upscale.compression);
        }
    }
    drop(manager);
    
    // Simulate processing (would actually process if files exist)
    if input_path.exists() {
        println!("Processing...");
        let start = Instant::now();
        
        match upscale_to_4k(input_path, output_path).await {
            Ok(result) => {
                println!("✓ Processing completed successfully!");
                println!("  Processing time: {:?}", result.processing_time);
                println!("  Output file: {:?}", result.output_path);
            }
            Err(e) => {
                println!("✗ Processing failed: {}", e);
                println!("  Suggestion: {}", e.user_friendly_message());
            }
        }
    } else {
        println!("⚠ Input file not found - showing workflow only");
        println!("  Would process: {:?} -> {:?}", input_path, output_path);
    }
    
    println!();
    Ok(())
}

/// Demonstrate frame rate conversion workflow
async fn demonstrate_frame_rate_workflow() -> std::result::Result<(), Box<dyn std::error::Error>> {
    println!("=== Frame Rate Conversion Workflow ===");
    
    let input_path = Path::new("examples/low_fps_video.mp4");
    let output_path = Path::new("output/smooth_60fps.mp4");
    
    println!("Scenario: Converting 24fps video to smooth 60fps");
    println!("Input: {:?}", input_path);
    println!("Output: {:?}", output_path);
    println!("Template: convert_to_60fps");
    
    // Show template parameters
    let manager = global_topaz_templates().lock().unwrap();
    if let Ok(applied) = manager.apply_template("convert_to_60fps") {
        println!("Processing parameters:");
        if let Some(interpolation) = &applied.enhance_params.interpolation {
            println!("  • Interpolation model: {:?}", interpolation.model);
            println!("  • Multiplier: {}x", interpolation.multiplier);
            println!("  • Target FPS: {:?}", interpolation.target_fps);
        }
        if let Some(fps) = applied.output_fps {
            println!("  • Output frame rate: {} fps", fps);
        }
    }
    drop(manager);
    
    if input_path.exists() {
        println!("Processing...");
        match convert_to_60fps(input_path, output_path).await {
            Ok(result) => {
                println!("✓ Frame rate conversion completed!");
                println!("  Processing time: {:?}", result.processing_time);
            }
            Err(e) => {
                println!("✗ Processing failed: {}", e);
            }
        }
    } else {
        println!("⚠ Input file not found - showing workflow only");
    }
    
    println!();
    Ok(())
}

/// Demonstrate video restoration workflow
async fn demonstrate_restoration_workflow() -> std::result::Result<(), Box<dyn std::error::Error>> {
    println!("=== Video Restoration Workflow ===");
    
    let input_path = Path::new("examples/noisy_old_video.mp4");
    let output_path = Path::new("output/restored_clean.mp4");
    
    println!("Scenario: Restoring old, noisy video footage");
    println!("Input: {:?}", input_path);
    println!("Output: {:?}", output_path);
    println!("Template: remove_noise");
    
    // Show restoration parameters
    let manager = global_topaz_templates().lock().unwrap();
    if let Ok(applied) = manager.apply_template("remove_noise") {
        println!("Processing parameters:");
        if let Some(upscale) = &applied.enhance_params.upscale {
            println!("  • AI Model: {:?} (specialized for noise reduction)", upscale.model);
            println!("  • Noise reduction: {}", upscale.noise);
            println!("  • Detail preservation: {}", upscale.details);
        }
    }
    drop(manager);
    
    if input_path.exists() {
        println!("Processing...");
        match remove_noise(input_path, output_path).await {
            Ok(result) => {
                println!("✓ Video restoration completed!");
                println!("  Processing time: {:?}", result.processing_time);
            }
            Err(e) => {
                println!("✗ Processing failed: {}", e);
            }
        }
    } else {
        println!("⚠ Input file not found - showing workflow only");
    }
    
    println!();
    Ok(())
}

/// Demonstrate creative effects workflow
async fn demonstrate_creative_workflow() -> std::result::Result<(), Box<dyn std::error::Error>> {
    println!("=== Creative Effects Workflow ===");
    
    let input_path = Path::new("examples/action_video.mp4");
    let output_path = Path::new("output/epic_slow_motion.mp4");
    
    println!("Scenario: Creating cinematic slow motion effect");
    println!("Input: {:?}", input_path);
    println!("Output: {:?}", output_path);
    println!("Template: 4x_slow_motion");
    
    // Show creative parameters
    let manager = global_topaz_templates().lock().unwrap();
    if let Ok(applied) = manager.apply_template("4x_slow_motion") {
        println!("Processing parameters:");
        if let Some(interpolation) = &applied.enhance_params.interpolation {
            println!("  • Slow motion factor: {}x", interpolation.multiplier);
            println!("  • Interpolation model: {:?}", interpolation.model);
            println!("  • Input FPS: {}", interpolation.input_fps);
        }
    }
    drop(manager);
    
    if input_path.exists() {
        println!("Processing...");
        match slow_motion_4x(input_path, output_path).await {
            Ok(result) => {
                println!("✓ Slow motion effect created!");
                println!("  Processing time: {:?}", result.processing_time);
            }
            Err(e) => {
                println!("✗ Processing failed: {}", e);
            }
        }
    } else {
        println!("⚠ Input file not found - showing workflow only");
    }
    
    println!();
    Ok(())
}

/// Demonstrate batch processing workflow
async fn demonstrate_batch_processing() -> std::result::Result<(), Box<dyn std::error::Error>> {
    println!("=== Batch Processing Workflow ===");
    
    let input_files = vec![
        ("examples/video1.mp4", "output/video1_enhanced.mp4", "upscale_to_4k"),
        ("examples/video2.mp4", "output/video2_smooth.mp4", "convert_to_60fps"),
        ("examples/video3.mp4", "output/video3_clean.mp4", "remove_noise"),
    ];
    
    println!("Scenario: Processing multiple videos with different templates");
    
    for (input, output, template) in &input_files {
        println!("\nProcessing: {} -> {} (template: {})", input, output, template);
        
        let input_path = Path::new(input);
        let output_path = Path::new(output);
        
        if input_path.exists() {
            match process_with_template(input_path, output_path, template).await {
                Ok(result) => {
                    println!("  ✓ Completed in {:?}", result.processing_time);
                }
                Err(e) => {
                    println!("  ✗ Failed: {}", e);
                }
            }
        } else {
            println!("  ⚠ Input file not found - would process with template '{}'", template);
        }
    }
    
    println!("\nBatch processing workflow complete!");
    println!();
    Ok(())
}