use {
    clap::ArgMatches,
    hpk_cli::cli,
    hpk::{Creator, Dependency, Message, Specs, Version},
    ron::ser::{to_writer_pretty, PrettyConfig},
    std::{
        env,
        error::Error,
        ffi::OsStr,
        fs::File,
        io::{self, BufWriter},
        path::PathBuf,
        sync::mpsc,
    },
};

fn main() -> Result<(), Box<dyn Error>> {
    let matches = cli().get_matches();
    match matches.subcommand() {
        Some(("create", matches)) => create(matches)?,
        Some(("init", matches)) => {
            let specsfile = init(matches)?;
            println!("Created specsfile {}", specsfile.display());
        }
        Some(("search", matches)) => search(matches)?,
        Some(("install", matches)) => install(matches)?,
        Some(("remove", matches)) => remove(matches)?,
        Some(("upgrade", _)) => upgrade()?,
        _ => {}
    }
    Ok(())
}

fn create(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let dir = PathBuf::from(matches.get_one::<String>("directory").unwrap().to_string());
    let outdir = if let Some(d) = matches.get_one::<String>("output") {
        PathBuf::from(&d.to_string())
    } else {
        env::current_dir()?
    };
    let mut specs = if let Some(s) = matches.get_one::<String>("specs") {
        let path = PathBuf::from(s.to_string());
        let fd = File::open(path)?;
        ron::de::from_reader(fd)?
    } else {
        Specs::default()
    };
    if let Some(n) = matches.get_one::<String>("name") {
        specs.name = n.to_string();
    }
    if let Some(v) = matches.get_one::<String>("package-version") {
        specs.version = v.to_string().parse::<Version>()?;
    }
    if let Some(r) = matches.get_one::<u8>("release") {
        specs.release = *r;
    }
    if let Some(deps) = matches.get_many::<String>("dependencies") {
        for d in deps {
            let d = Dependency {
                name: d.to_string(),
                version: (None, None),
            };
            specs.dependencies.push(d);
        }
    }
    let creator = Creator::new(&dir, specs)?;
    let (sender, receiver) = mpsc::channel();
    creator.create(&outdir, sender)?;
    for msg in receiver.iter() {
        match msg {
            Message::MemberAdded(_s) => {}
            Message::Success(s) => println!("{s}"),
            Message::Failure(s) => {
                eprint!("{s}");
                return Err(io::Error::new(io::ErrorKind::Other, s).into());
            }
        }
    }
    Ok(())
}

fn init(matches: &ArgMatches) -> Result<PathBuf, Box<dyn Error>> {
    let specsfile = PathBuf::from("package.specs");
    let cfg = PrettyConfig::new().struct_names(true);
    let buf = File::create(&specsfile)?;
    let writer = BufWriter::new(buf);
    let specs = create_specs(matches)?;
    to_writer_pretty(writer, &specs, cfg)?;
    Ok(specsfile)
}

fn search(_matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    unimplemented!();
}

fn install(_matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    unimplemented!();
}

fn remove(_matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    unimplemented!();
}

fn upgrade() -> Result<(), Box<dyn Error>> {
    unimplemented!();
}

#[allow(clippy::cast_possible_truncation)]
pub fn create_specs(matches: &ArgMatches) -> Result<Specs, Box<dyn Error>> {
    let mut specs = Specs::default();
    let mut name: Option<String> = None;
    let mut version: Option<Version> = None;
    let cwd = env::current_dir()?;
    if let Some(dir) = cwd.file_name().and_then(OsStr::to_str) {
        if let Some((n, v)) = dir.split_once('-') {
            name = Some(n.to_string());
            if let Ok(v) = v.parse() {
                version = Some(v);
            }
        }
    }
    if let Some(name) = matches.get_one::<String>("name") {
        specs.name = name.to_string();
    } else if let Some(n) = name {
        specs.name = n;
    }
    if let Some(version) = matches.get_one::<String>("package-version") {
        specs.version = version.parse()?;
    } else if let Some(v) = version {
        specs.version = v;
    }
    if let Some(release) = matches.get_one::<usize>("release") {
        specs.release = *release as u8;
    }
    if let Some(deps) = matches.get_many::<String>("dependencies") {
        let deps = deps
            .map(|d| Dependency {
                name: d.to_string(),
                version: (None, None),
            })
            .collect::<Vec<Dependency>>();
        specs.dependencies = deps;
    }
    Ok(specs)
}