oximedia-cli 0.1.4

//! Standalone filter graph processing command.
//!
//! Provides filter-related commands using the `oximedia-graph` crate for building
//! and running filter pipelines.

use anyhow::{Context, Result};
use clap::Subcommand;
use colored::Colorize;
use std::path::PathBuf;

/// Filter command subcommands.
#[derive(Subcommand, Debug)]
pub enum FilterCommand {
    /// Apply a filter graph to a media file
    Apply {
        /// Input file path
        #[arg(short, long)]
        input: PathBuf,

        /// Output file path
        #[arg(short, long)]
        output: PathBuf,

        /// Filter graph description (e.g., "scale=1280:720,crop=640:480")
        #[arg(long)]
        graph: String,

        /// Overwrite output file without asking
        #[arg(short = 'y', long)]
        overwrite: bool,
    },

    /// List available filters
    List {
        /// Filter by category: video, audio, all
        #[arg(long, default_value = "all")]
        category: String,
    },

    /// Show detailed information about a filter
    Info {
        /// Filter name
        #[arg(value_name = "NAME")]
        name: String,
    },
}

/// Handle filter command dispatch.
pub async fn handle_filter_command(command: FilterCommand, json_output: bool) -> Result<()> {
    match command {
        FilterCommand::Apply {
            input,
            output,
            graph,
            overwrite,
        } => apply_filter(&input, &output, &graph, overwrite, json_output).await,
        FilterCommand::List { category } => list_filters(&category, json_output).await,
        FilterCommand::Info { name } => filter_info(&name, json_output).await,
    }
}

/// Known built-in filter descriptions.
struct FilterDesc {
    name: &'static str,
    category: &'static str,
    description: &'static str,
    parameters: &'static str,
}

/// Get the list of known filters.
fn known_filters() -> Vec<FilterDesc> {
    vec![
        FilterDesc {
            name: "scale",
            category: "video",
            description: "Scale video to specified dimensions",
            parameters: "width:height (e.g., scale=1280:720, scale=-1:720)",
        },
        FilterDesc {
            name: "crop",
            category: "video",
            description: "Crop video to specified region",
            parameters: "width:height[:x:y] (e.g., crop=640:480, crop=640:480:100:50)",
        },
        FilterDesc {
            name: "rotate",
            category: "video",
            description: "Rotate video by specified angle",
            parameters: "angle (in radians, e.g., rotate=PI/2)",
        },
        FilterDesc {
            name: "flip",
            category: "video",
            description: "Flip video horizontally",
            parameters: "(no parameters)",
        },
        FilterDesc {
            name: "vflip",
            category: "video",
            description: "Flip video vertically",
            parameters: "(no parameters)",
        },
        FilterDesc {
            name: "fps",
            category: "video",
            description: "Change frame rate",
            parameters: "rate (e.g., fps=30, fps=24000/1001)",
        },
        FilterDesc {
            name: "pad",
            category: "video",
            description: "Pad video with borders",
            parameters: "width:height[:x:y[:color]] (e.g., pad=1920:1080:0:0:black)",
        },
        FilterDesc {
            name: "deinterlace",
            category: "video",
            description: "Deinterlace video using bob or weave method",
            parameters: "method (bob, weave, yadif)",
        },
        FilterDesc {
            name: "denoise",
            category: "video",
            description: "Reduce video noise",
            parameters: "strength[:temporal] (e.g., denoise=3, denoise=5:2)",
        },
        FilterDesc {
            name: "sharpen",
            category: "video",
            description: "Sharpen video",
            parameters: "amount (e.g., sharpen=1.5)",
        },
        FilterDesc {
            name: "volume",
            category: "audio",
            description: "Adjust audio volume",
            parameters: "gain (dB or factor, e.g., volume=2.0, volume=6dB)",
        },
        FilterDesc {
            name: "atempo",
            category: "audio",
            description: "Change audio tempo without pitch change",
            parameters: "factor (e.g., atempo=1.5)",
        },
        FilterDesc {
            name: "aresample",
            category: "audio",
            description: "Resample audio to specified rate",
            parameters: "rate (e.g., aresample=48000)",
        },
        FilterDesc {
            name: "amix",
            category: "audio",
            description: "Mix multiple audio streams",
            parameters: "inputs[:duration] (e.g., amix=2:longest)",
        },
        FilterDesc {
            name: "lowpass",
            category: "audio",
            description: "Low-pass audio filter",
            parameters: "frequency (Hz, e.g., lowpass=3000)",
        },
        FilterDesc {
            name: "highpass",
            category: "audio",
            description: "High-pass audio filter",
            parameters: "frequency (Hz, e.g., highpass=200)",
        },
        FilterDesc {
            name: "equalizer",
            category: "audio",
            description: "Parametric equalizer",
            parameters: "freq:width:gain (e.g., equalizer=1000:200:6)",
        },
    ]
}

/// Apply a filter graph to a media file.
async fn apply_filter(
    input: &PathBuf,
    output: &PathBuf,
    graph_desc: &str,
    overwrite: bool,
    json_output: bool,
) -> Result<()> {
    if !input.exists() {
        return Err(anyhow::anyhow!("Input file not found: {}", input.display()));
    }

    if output.exists() && !overwrite {
        return Err(anyhow::anyhow!(
            "Output file already exists: {} (use -y to overwrite)",
            output.display()
        ));
    }

    // Parse the filter graph description
    let filter_chain: Vec<&str> = graph_desc.split(',').collect();

    if json_output {
        let result = serde_json::json!({
            "input": input.display().to_string(),
            "output": output.display().to_string(),
            "graph": graph_desc,
            "filters": filter_chain,
            "status": "pending_media_pipeline",
            "message": "Filter graph parsed; awaiting media pipeline integration",
        });
        let json_str =
            serde_json::to_string_pretty(&result).context("Failed to serialize result")?;
        println!("{}", json_str);
    } else {
        println!("{}", "Filter Graph Processing".green().bold());
        println!("{}", "=".repeat(60));
        println!("{:20} {}", "Input:", input.display());
        println!("{:20} {}", "Output:", output.display());
        println!("{:20} {}", "Graph:", graph_desc);
        println!();

        println!("{}", "Filter Chain".cyan().bold());
        println!("{}", "-".repeat(60));
        for (i, filter) in filter_chain.iter().enumerate() {
            println!("  {}. {}", i + 1, filter.trim());
        }
        println!();

        println!(
            "{}",
            "Note: Media decoding/encoding pipeline not yet integrated.".yellow()
        );
        println!(
            "{}",
            "Filter graph builder is ready; media pipeline will enable end-to-end processing."
                .dimmed()
        );
    }

    Ok(())
}

/// List available filters.
async fn list_filters(category: &str, json_output: bool) -> Result<()> {
    let all_filters = known_filters();

    let filters: Vec<&FilterDesc> = match category.to_lowercase().as_str() {
        "video" => all_filters
            .iter()
            .filter(|f| f.category == "video")
            .collect(),
        "audio" => all_filters
            .iter()
            .filter(|f| f.category == "audio")
            .collect(),
        _ => all_filters.iter().collect(),
    };

    if json_output {
        let filter_list: Vec<serde_json::Value> = filters
            .iter()
            .map(|f| {
                serde_json::json!({
                    "name": f.name,
                    "category": f.category,
                    "description": f.description,
                    "parameters": f.parameters,
                })
            })
            .collect();
        let result = serde_json::json!({
            "filters": filter_list,
            "count": filter_list.len(),
        });
        let json_str =
            serde_json::to_string_pretty(&result).context("Failed to serialize result")?;
        println!("{}", json_str);
    } else {
        println!("{}", "Available Filters".green().bold());
        println!("{}", "=".repeat(60));
        println!();

        let mut current_category = "";
        for f in &filters {
            if f.category != current_category {
                current_category = f.category;
                let cat_title = match current_category {
                    "video" => "Video Filters",
                    "audio" => "Audio Filters",
                    _ => current_category,
                };
                println!("{}", cat_title.cyan().bold());
                println!("{}", "-".repeat(60));
            }
            println!("  {:16} {}", f.name.green(), f.description);
        }
        println!();
        println!("{}", format!("Total: {} filter(s)", filters.len()).dimmed());
        println!();
        println!(
            "Use {} for details on a specific filter.",
            "oximedia filter info <name>".cyan()
        );
    }

    Ok(())
}

/// Show detailed information about a filter.
async fn filter_info(name: &str, json_output: bool) -> Result<()> {
    let all_filters = known_filters();

    let filter = all_filters
        .iter()
        .find(|f| f.name.eq_ignore_ascii_case(name));

    match filter {
        Some(f) => {
            if json_output {
                let result = serde_json::json!({
                    "name": f.name,
                    "category": f.category,
                    "description": f.description,
                    "parameters": f.parameters,
                });
                let json_str =
                    serde_json::to_string_pretty(&result).context("Failed to serialize result")?;
                println!("{}", json_str);
            } else {
                println!("{}", "Filter Information".green().bold());
                println!("{}", "=".repeat(60));
                println!("{:20} {}", "Name:", f.name.green());
                println!("{:20} {}", "Category:", f.category);
                println!("{:20} {}", "Description:", f.description);
                println!("{:20} {}", "Parameters:", f.parameters);
                println!();
                println!(
                    "{}",
                    format!(
                        "Usage: oximedia filter apply -i input -o output --graph \"{}=...\"",
                        f.name
                    )
                    .dimmed()
                );
            }
        }
        None => {
            return Err(anyhow::anyhow!(
                "Unknown filter '{}'. Use 'oximedia filter list' to see available filters.",
                name
            ));
        }
    }

    Ok(())
}