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use std::fs;

use serde_derive::{Deserialize, Serialize};

use crate::target::{
    generate_hash, Dependencies, Dependency, LanguageTarget, ProgramCommand, Shell,
    SupportedLanguage,
};

const BUILD_TEMPLATE: &str = include_str!("./templates/node/package.json.tmpl");
const SOURCE_TEMPLATE: &str = include_str!("./templates/node/index.js.tmpl");
const SHELL_TEMPLATE: &str = include_str!("./templates/node/shell.sh.tmpl");

#[derive(Deserialize, Serialize)]
pub struct Context {
    pub deps: Dependencies,
    pub dep_string: String,
    pub packages: Vec<String>,
}

pub fn new(deps: Dependencies, shell: bool) -> LanguageTarget<Context> {
    LanguageTarget::new(
        ("package.json", BUILD_TEMPLATE),
        Context {
            deps: deps.clone(),
            dep_string: generate_dep_string(deps.clone()),
            packages: generate_packages(deps.clone()),
        },
        generate_hash(deps, SupportedLanguage::node),
        ProgramCommand::new(String::from("npm"), vec!["i".to_string()]),
        if shell {
            Some(Shell::new(
                Box::new(|| {
                    let source = fs::read_to_string("./src/index.js")?;
                    Ok(ProgramCommand::new(
                        String::from("node"),
                        vec![
                            "-i".to_string(),
                            "--experimental-repl-await".to_string(),
                            "-e".to_string(),
                            source,
                        ],
                    ))
                }),
                SHELL_TEMPLATE,
            ))
        } else {
            None
        },
        "src",
        vec![("index.js", SOURCE_TEMPLATE)],
    )
}

fn generate_dep_string(deps: Dependencies) -> String {
    deps.iter()
        .map(|Dependency { name, version }| format!("\"{}\": \"^{}\"", name, version))
        .collect::<Vec<String>>()
        .join(",\n")
}

fn generate_packages(deps: Dependencies) -> Vec<String> {
    deps.iter().map(|dep| dep.name.clone()).collect()
}