"""CAD-Documenter CLI - Main entry point."""

import sys
from pathlib import Path

import click
from rich.console import Console
from rich.progress import Progress, SpinnerColumn, TextColumn
from rich.panel import Panel

from .config import load_config, create_default_config
from .pipeline import DocumentationPipeline

console = Console()


def print_banner():
    """Print welcome banner."""
    console.print(Panel.fit(
        "[bold blue]CAD-Documenter[/bold blue] v0.1.0\n"
        "[dim]Video walkthrough → Engineering documentation[/dim]",
        border_style="blue"
    ))


@click.command()
@click.argument("video", type=click.Path(exists=True, path_type=Path))
@click.option("-o", "--output", type=click.Path(path_type=Path), help="Output directory")
@click.option("--frames-only", is_flag=True, help="Only extract frames, skip documentation")
@click.option("--atomizer-hints", is_flag=True, help="Generate Atomizer FEA hints")
@click.option("--bom", is_flag=True, help="Generate Bill of Materials")
@click.option("--pdf", is_flag=True, help="Generate PDF via Atomaste Report Standard")
@click.option("--frame-interval", type=float, help="Seconds between frame extractions")
@click.option("--whisper-model", type=click.Choice(["tiny", "base", "small", "medium", "large"]), help="Whisper model size")
@click.option("--api-provider", type=click.Choice(["openai", "anthropic"]), help="Vision API provider")
@click.option("--config", "config_path", type=click.Path(exists=True, path_type=Path), help="Config file path")
@click.option("--init-config", is_flag=True, help="Create default config file and exit")
@click.option("-v", "--verbose", is_flag=True, help="Verbose output")
@click.version_option()
def main(
    video: Path,
    output: Path | None,
    frames_only: bool,
    atomizer_hints: bool,
    bom: bool,
    pdf: bool,
    frame_interval: float | None,
    whisper_model: str | None,
    api_provider: str | None,
    config_path: Path | None,
    init_config: bool,
    verbose: bool,
):
    """
    Generate engineering documentation from a CAD walkthrough video.

    VIDEO: Path to the video file (.mp4, .mov, .avi, etc.)

    Examples:

        cad-doc walkthrough.mp4

        cad-doc video.mp4 --output ./docs --bom --atomizer-hints

        cad-doc video.mp4 --pdf --whisper-model medium
    """
    print_banner()
    
    # Handle --init-config
    if init_config:
        default_path = Path.home() / ".cad-documenter.toml"
        create_default_config(default_path)
        console.print(f"[green]✓[/green] Created config file: {default_path}")
        console.print("[dim]Edit this file to configure API keys and defaults.[/dim]")
        return
    
    # Load configuration
    config = load_config(config_path)
    
    # Override config with CLI options
    if frame_interval is not None:
        config.processing.frame_interval = frame_interval
    if whisper_model is not None:
        config.processing.whisper_model = whisper_model
    if api_provider is not None:
        config.api.provider = api_provider
    
    # Check API key
    if not frames_only and not config.api.api_key:
        provider = config.api.provider.upper()
        console.print(f"[red]Error:[/red] No API key found for {config.api.provider}.")
        console.print(f"Set [cyan]{provider}_API_KEY[/cyan] environment variable or add to config file.")
        console.print(f"\nTo create a config file: [cyan]cad-doc --init-config[/cyan]")
        sys.exit(1)
    
    console.print(f"Processing: [cyan]{video.name}[/cyan]")
    if verbose:
        console.print(f"  API: {config.api.provider} ({config.api.vision_model or 'default'})")
        console.print(f"  Whisper: {config.processing.whisper_model}")
    
    # Default output directory
    if output is None:
        output = video.parent / f"{video.stem}_docs"
    
    output.mkdir(parents=True, exist_ok=True)
    console.print(f"Output: [cyan]{output}[/cyan]")
    
    # Initialize pipeline
    try:
        pipeline = DocumentationPipeline(
            video_path=video,
            output_dir=output,
            config=config,
        )
    except ValueError as e:
        console.print(f"[red]Configuration error:[/red] {e}")
        sys.exit(1)
    
    # Frames only mode
    if frames_only:
        with Progress(
            SpinnerColumn(),
            TextColumn("[progress.description]{task.description}"),
            console=console,
        ) as progress:
            progress.add_task("Extracting frames...", total=None)
            frames = pipeline.extract_frames()
        
        console.print(f"[green]✓[/green] Extracted {len(frames)} frames to {output / 'frames'}")
        return
    
    # Full pipeline
    with Progress(
        SpinnerColumn(),
        TextColumn("[progress.description]{task.description}"),
        console=console,
    ) as progress:
        
        # Step 1: Extract frames
        task1 = progress.add_task("[cyan]Step 1/4:[/cyan] Extracting frames...", total=None)
        frames = pipeline.extract_frames()
        progress.update(task1, description=f"[green]✓[/green] Extracted {len(frames)} frames")
        progress.remove_task(task1)
        
        # Step 2: Transcribe
        task2 = progress.add_task("[cyan]Step 2/4:[/cyan] Transcribing audio...", total=None)
        transcript = pipeline.transcribe_audio()
        seg_count = len(transcript.segments) if transcript.segments else 0
        progress.update(task2, description=f"[green]✓[/green] Transcribed {seg_count} segments")
        progress.remove_task(task2)
        
        if verbose and transcript.full_text:
            console.print(Panel(
                transcript.full_text[:500] + ("..." if len(transcript.full_text) > 500 else ""),
                title="Transcript Preview",
                border_style="dim"
            ))
        
        # Step 3: Analyze
        task3 = progress.add_task("[cyan]Step 3/4:[/cyan] Analyzing components...", total=None)
        analysis = pipeline.analyze_components(frames, transcript)
        comp_count = len(analysis.components)
        progress.update(task3, description=f"[green]✓[/green] Identified {comp_count} components")
        progress.remove_task(task3)
        
        if verbose and analysis.components:
            console.print("\n[bold]Components found:[/bold]")
            for c in analysis.components:
                console.print(f"  • {c.name} ({c.material or 'material unknown'})")
        
        # Step 4: Generate documentation
        task4 = progress.add_task("[cyan]Step 4/4:[/cyan] Generating documentation...", total=None)
        doc_path = pipeline.generate_documentation(
            analysis, 
            atomizer_hints=atomizer_hints or config.output.include_atomizer_hints,
            bom=bom or config.output.include_bom,
        )
        progress.update(task4, description=f"[green]✓[/green] Documentation generated")
        progress.remove_task(task4)
    
    # Generate PDF if requested
    if pdf:
        console.print("[cyan]Generating PDF...[/cyan]")
        try:
            pdf_path = pipeline.generate_pdf(doc_path)
            console.print(f"[green]✓[/green] PDF: {pdf_path}")
        except Exception as e:
            console.print(f"[yellow]Warning:[/yellow] PDF generation failed: {e}")
    
    # Summary
    console.print()
    console.print(Panel.fit(
        f"[bold green]Documentation complete![/bold green]\n\n"
        f"📄 [cyan]{doc_path}[/cyan]\n"
        f"📊 {len(analysis.components)} components documented\n"
        f"🖼️  {len(frames)} frames extracted",
        title="Summary",
        border_style="green"
    ))
    
    # Show atomizer hints summary if generated
    if (atomizer_hints or config.output.include_atomizer_hints) and analysis.atomizer_hints:
        hints = analysis.atomizer_hints
        if hints.objectives or hints.constraints:
            console.print("\n[bold]Atomizer Hints:[/bold]")
            for obj in hints.objectives[:3]:
                console.print(f"  🎯 {obj['direction'].capitalize()} {obj['name']}")
            for constraint in hints.constraints[:3]:
                console.print(f"  📏 {constraint['type']}: {constraint['value']}")


if __name__ == "__main__":
    main()