use clap::Subcommand;
use std::path::Path;

#[derive(Subcommand)]
pub enum ConfigCommand {
    Init {
        #[arg(short, long)]
        force: bool,
    },
    #[command(name = "config-show")]
    Show {
        #[arg(short, long)]
        section: Option<String>,
    },
    Edit {
        #[arg(short, long)]
        key: String,
        #[arg(short, long)]
        value: String,
    },
    Validate,
}

pub fn handle_config_command(cmd: ConfigCommand) -> anyhow::Result<()> {
    match cmd {
        ConfigCommand::Init { force } => {
            let config_path = Path::new("config/markbase.toml");

            if config_path.exists() && !force {
                println!("Configuration file already exists at config/markbase.toml");
                println!("Use --force to overwrite");
                return Ok(());
            }

            let config = crate::config::MarkBaseConfig::default_config();
            config.save(config_path)?;

            println!("✓ Configuration file created: config/markbase.toml");
            println!("Default values:");
            println!("  Server port: {}", config.server.port);
            println!("  PostgreSQL host: {}", config.postgresql.host);
            println!("  Test users: {}", config.test.users.join(", "));
        }
        ConfigCommand::Show { section } => {
            let config_path = Path::new("config/markbase.toml");

            if !config_path.exists() {
                println!(
                    "Configuration file not found. Run 'markbase metadata config init' first."
                );
                return Ok(());
            }

            let config = crate::config::MarkBaseConfig::load(config_path)?;

            if let Some(s) = section {
                show_section(&config, &s);
            } else {
                println!("{}", toml::to_string_pretty(&config)?);
            }
        }
        ConfigCommand::Edit { key, value } => {
            let config_path = Path::new("config/markbase.toml");

            if !config_path.exists() {
                println!(
                    "Configuration file not found. Run 'markbase metadata config init' first."
                );
                return Ok(());
            }

            let mut config = crate::config::MarkBaseConfig::load(config_path)?;

            match config.get(&key) {
                Some(old_value) => {
                    config.set(&key, &value)?;
                    config.validate()?;
                    config.save(config_path)?;
                    println!("✓ Updated {}: {} → {}", key, old_value, value);
                }
                None => {
                    println!("Invalid config key: {}", key);
                    println!(
                        "Valid keys: server.*, postgresql.*, authentication.*, test.*, logging.*"
                    );
                }
            }
        }
        ConfigCommand::Validate => {
            let config_path = Path::new("config/markbase.toml");

            if !config_path.exists() {
                println!(
                    "Configuration file not found. Run 'markbase metadata config init' first."
                );
                return Ok(());
            }

            let config = crate::config::MarkBaseConfig::load(config_path)?;

            match config.validate() {
                Ok(_) => {
                    println!("✓ Configuration is valid");
                }
                Err(e) => {
                    println!("✗ Configuration validation failed: {}", e);
                }
            }
        }
    }

    Ok(())
}

fn show_section(config: &crate::config::MarkBaseConfig, section: &str) {
    match section {
        "server" => println!("{}", toml::to_string_pretty(&config.server).unwrap()),
        "postgresql" => println!("{}", toml::to_string_pretty(&config.postgresql).unwrap()),
        "authentication" => println!("{}", toml::to_string_pretty(&config.authentication).unwrap()),
        "test" => println!("{}", toml::to_string_pretty(&config.test).unwrap()),
        "logging" => println!("{}", toml::to_string_pretty(&config.logging).unwrap()),
        _ => println!("Invalid section: {}. Valid sections: server, postgresql, authentication, test, logging", section),
    }
}