#[macro_use]
extern crate rust_util;

use argh::FromArgs;
use rust_util::util_os::get_user_home;
use std::os::unix::fs::PermissionsExt;
use std::{env, fs};

use crate::install::install_script;
use crate::list::list_scripts;
use crate::util::{
    build_script_command, get_run_script_bin_name, read_file_and_digest, run_script_command,
};

#[cfg(feature = "switch-dart-lang")]
mod help_dart;
#[cfg(feature = "switch-go-lang")]
mod help_go;
#[cfg(feature = "switch-js-lang")]
mod help_js;
#[cfg(feature = "switch-rust-lang")]
mod help_rs;
mod install;
mod list;
mod util;

#[cfg(feature = "switch-rust-lang")]
const CMD_NAME: &str = "runrs";
#[cfg(feature = "switch-go-lang")]
const CMD_NAME: &str = "rungo";
#[cfg(feature = "switch-js-lang")]
const CMD_NAME: &str = "runjs";
#[cfg(feature = "switch-dart-lang")]
const CMD_NAME: &str = "rundart";

#[derive(FromArgs, PartialEq, Debug)]
/// Run script
struct RunScriptArgs {
    /// help message
    #[argh(switch, short = 'h')]
    help_message: bool,
    /// script template
    #[argh(switch, short = 't')]
    template: bool,
    /// list scripts
    #[argh(switch, short = 'l')]
    list: bool,
    /// install script
    #[argh(switch, short = 'i')]
    install: bool,
    /// output
    #[argh(option, short = 'o')]
    output: Option<String>,
    /// arguments
    #[argh(positional, greedy)]
    arguments: Vec<String>,
}

fn main() {
    let rs_args: RunScriptArgs = argh::from_env();
    // println!("{:#?}", rs_args);

    if env::args().len() == 1 {
        failure_and_exit!(
            "{} v{}, need arguments, `{} -h` or `{} --help-message` for help",
            CMD_NAME,
            env!("CARGO_PKG_VERSION"),
            CMD_NAME,
            CMD_NAME,
        );
    }

    if rs_args.help_message {
        print_help();
        return;
    }
    if rs_args.template {
        print_template(&rs_args.output);
        return;
    }
    if rs_args.list {
        list_scripts(rs_args.arguments.get(1));
        return;
    }
    if rs_args.install {
        if rs_args.arguments.is_empty() {
            failure_and_exit!("No scripts assigned.");
        }
        for (i, script_name) in rs_args.arguments.iter().enumerate() {
            information!(
                "Installing script: {} [ {} / {} ]",
                script_name,
                (i + 1),
                rs_args.arguments.len()
            );
            install_script(script_name);
        }
        return;
    }

    #[cfg(any(
        feature = "switch-go-lang",
        feature = "switch-js-lang",
        feature = "switch-dart-lang"
    ))]
    if true {
        failure_and_exit!("Only rust supports run by runrs.");
    }

    if rs_args.arguments.is_empty() {
        failure_and_exit!("Must assign a script file name");
    }
    let script_file = &rs_args.arguments[0];
    let (_, script_sha256) = read_file_and_digest(script_file);
    debugging!("File {} -> sha256: {}", script_file, script_sha256);

    let user_home = get_user_home().unwrap_or_else(|| failure_and_exit!("$HOME not found!"));
    let rust_script = get_run_script_bin_name(&user_home);
    let cache_script_bin_name = get_cache_script_bin_name(&user_home, &script_sha256);
    let mut run_script_cmd = build_script_command(
        rust_script,
        script_file,
        &script_sha256,
        &cache_script_bin_name,
    );
    for arg in rs_args.arguments.iter().skip(1) {
        run_script_cmd.arg(arg);
    }
    run_script_command(script_file, &cache_script_bin_name, &mut run_script_cmd)
}

fn print_help() {
    #[cfg(feature = "switch-rust-lang")]
    help_rs::print_help();
    #[cfg(feature = "switch-go-lang")]
    help_go::print_help();
    #[cfg(feature = "switch-js-lang")]
    help_js::print_help();
    #[cfg(feature = "switch-dart-lang")]
    help_dart::print_help();
}

fn print_template(output: &Option<String>) {
    #[cfg(feature = "switch-rust-lang")]
    let script = include_str!("script.template.rs");
    #[cfg(feature = "switch-go-lang")]
    let script = include_str!("script.template.go");
    #[cfg(feature = "switch-js-lang")]
    let script = include_str!("script.template.js");
    #[cfg(feature = "switch-dart-lang")]
    let script = include_str!("script.template.dart");
    match output {
        None => {
            println!("{}", script);
        }
        Some(output_file) => {
            if fs::metadata(output_file).is_ok() {
                failure!("Output script file exists: {}", output_file);
            } else {
                match fs::write(output_file, script) {
                    Ok(_) => {
                        success!("Write script file success: {}", output_file);
                        let _ = fs::set_permissions(&output_file, PermissionsExt::from_mode(0o755));
                    }
                    Err(e) => {
                        failure!("Write script file: {}, failed: {}", output_file, e);
                    }
                }
            }
        }
    }
}

fn get_cache_script_bin_name(user_home: &str, script_sha256: &str) -> String {
    #[cfg(target_os = "macos")]
    let cache_script_bin_name = format!(
        "{}/Library/Caches/rust-script/binaries/release/{}",
        user_home, script_sha256
    );
    // #[cfg(target_os = "linux")]
    #[cfg(not(target_os = "macos"))]
    let cache_script_bin_name = format!(
        "{}/.cache/rust-script/binaries/release/{}",
        user_home, script_sha256
    );
    cache_script_bin_name
}