use std::{
    env::set_current_dir,
    path::{Path, PathBuf},
    process::Command,
};

use colored::Colorize;
use glob::glob;

const MAIN_C: &str = include_str!("templates/main.c");
const GITIGNORE: &str = include_str!("templates/gitignoretemplate");

#[derive(clap::Parser)]
#[clap(version)]
pub struct App {
    #[clap(subcommand)]
    command: Subcommand,
}

#[derive(clap::Subcommand)]
enum Subcommand {
    /// Create a new C project
    New {
        /// The name of the new project
        name: String,
    },
    /// Initialize a new C project
    Init,
    /// Run the local project
    Run {
        /// The build mode to use
        mode: Option<String>,
        /// Arguments to pass to the project binary
        #[arg(long, short)]
        args: Option<Vec<String>>,
    },
    /// Build the local project
    Build {
        /// The build mode to use
        mode: Option<String>,
    },
    /// Clean all in progress files
    Clean,
}

impl App {
    pub fn run(self) {
        match self.command {
            Subcommand::New { name } => match create_project(&name) {
                Err(e) => {
                    eprintln!("Error creating project '{name}': {e}");
                    std::process::exit(1);
                }
                _ => {}
            },
            Subcommand::Init => match create_project(".") {
                Err(e) => {
                    eprintln!("Error initializing project: {e}");
                    std::process::exit(1);
                }
                _ => {}
            },
            Subcommand::Run { mode, args } => {
                match build(&mode) {
                    Err(e) => {
                        eprintln!("Error building project: {e}");
                        std::process::exit(1);
                    }
                    _ => {}
                };
                if let Err(e) = run(&mode, args) {
                    eprintln!("Error running project: {e}");
                    std::process::exit(1);
                }
            }
            Subcommand::Build { mode } => match build(&mode) {
                Err(e) => {
                    eprintln!("Error building project: {e}");
                    std::process::exit(1);
                }
                _ => {}
            },
            Subcommand::Clean => match clean() {
                Err(e) => {
                    eprintln!("Error cleaning project: {e}");
                    std::process::exit(1);
                }
                _ => {}
            },
        }
    }
}

fn create_project<P: AsRef<Path>>(directory: P) -> std::io::Result<()> {
    let name = if directory.as_ref().to_string_lossy() == "." {
        String::new()
    } else {
        format!(" '{}'", directory.as_ref().to_string_lossy())
    };

    println!(
        "  {} binary (application){}",
        "Creating".green().bold(),
        name
    );

    let pathdir = directory.as_ref();

    if pathdir.exists() && pathdir.to_string_lossy() != "." {
        return Err(std::io::Error::new(
            std::io::ErrorKind::AlreadyExists,
            "specified directory already exists",
        ));
    }

    if !pathdir.exists() && pathdir.to_string_lossy() != "." {
        std::fs::create_dir(pathdir)?;
    }

    set_current_dir(pathdir)?;

    std::fs::create_dir("src")?;

    std::fs::write("src/main.c", MAIN_C)?;
    std::fs::write(".gitignore", GITIGNORE)?;

    let config = crate::config::Config::new(&pathdir.to_string_lossy());

    let serial = toml::to_string_pretty(&config).expect("a valid TOML structure");

    std::fs::write("Pallet.toml", &serial)?;

    Ok(())
}

fn get_config() -> Option<crate::config::Config> {
    let p = PathBuf::from("Pallet.toml");
    if !p.exists() {
        return None;
    }
    let raw = std::fs::read_to_string(&p).expect("A valid config file");

    toml::from_str(&raw).ok()
}

fn build(mode: &Option<String>) -> std::io::Result<()> {
    let conf = match get_config() {
        Some(conf) => conf,
        None => {
            eprintln!("Error opening config file. No Pallet.toml in current directory.");
            std::process::exit(1);
        }
    };

    let build_config = conf.get_or_default(mode).ok_or(std::io::Error::new(
        std::io::ErrorKind::NotFound,
        "build layout not found",
    ))?;

    println!(
        "  {} '{}' profile for project '{}'",
        "Building".green().bold(),
        build_config.name,
        conf.name
    );

    let start = std::time::Instant::now();

    std::fs::create_dir_all(format!("target/{}", build_config.name))?;

    let mut command = Command::new("gcc");

    for arg in &build_config.args {
        command.arg(arg);
    }

    for entry in glob("src/*.c")
        .map_err(|e| std::io::Error::new(std::io::ErrorKind::NotFound, format!("{e}").as_str()))?
    {
        if let Ok(path) = entry {
            command.arg(path.to_string_lossy().to_string());
        }
    }

    command
        .arg("-o")
        .arg(format!("target/{}/{}", build_config.name, conf.name));

    let mut child = command.spawn()?;

    child.wait()?;

    let stop = start.elapsed();

    println!(
        "   {} '{}' profile for project '{}' in {:.2}s",
        "Finished".green().bold(),
        build_config.name,
        conf.name,
        stop.as_secs_f64()
    );

    Ok(())
}

fn run(mode: &Option<String>, args: Option<Vec<String>>) -> std::io::Result<()> {
    let conf = match get_config() {
        Some(conf) => conf,
        None => {
            eprintln!("Error opening config file. No Pallet.toml in current directory.");
            std::process::exit(1);
        }
    };

    let build_config = conf.get_or_default(mode).ok_or(std::io::Error::new(
        std::io::ErrorKind::NotFound,
        "build layout not found",
    ))?;

    println!(
        "    {} '{}' profile for project '{}'",
        "Running".green().bold(),
        build_config.name,
        conf.name
    );

    let mut command = Command::new(format!("target/{}/{}", build_config.name, conf.name));

    if let Some(args) = args {
        for arg in args {
            command.arg(arg);
        }
    }

    let mut child = command.spawn()?;

    child.wait()?;

    Ok(())
}

fn clean() -> std::io::Result<()> {
    if let None = get_config() {
        return Err(std::io::Error::new(
            std::io::ErrorKind::NotFound,
            "no Pallet.toml found in local dir",
        ));
    }

    std::fs::remove_dir_all("target/")?;

    println!(
        "  {} removed files in target/ directory",
        "Successfully".green().bold()
    );

    Ok(())
}