use std::path::Path;

use just_template::{Template, tmpl_param};

use crate::{
    constants::{COMPILE_INFO_RS, COMPILE_INFO_RS_TEMPLATE},
    env::{get_git_branch, get_git_commit, get_platform, get_toolchain, get_version},
};

/// Generate compile info using just_template
pub async fn generate_compile_info(repo_root: &Path) {
    // Read the template code
    let template_code = tokio::fs::read_to_string(repo_root.join(COMPILE_INFO_RS_TEMPLATE))
        .await
        .unwrap();

    // Get all the values needed for the template
    let date = chrono::Local::now().format("%Y-%m-%d %H:%M:%S").to_string();
    let target = std::env::var("TARGET").unwrap_or_else(|_| "unknown".to_string());
    let platform = get_platform(&target);
    let toolchain = get_toolchain();
    let version = get_version();
    let branch = get_git_branch().unwrap_or_else(|_| "unknown".to_string());
    let commit = get_git_commit().unwrap_or_else(|_| "unknown".to_string());

    // Create a Template instance
    let mut template = Template::from(template_code);

    // Set all parameters
    tmpl_param!(
        template,
        date = date,
        target = target,
        platform = platform,
        toolchain = toolchain,
        version = version,
        branch = branch,
        commit = commit
    );

    // Expand the template
    let generated_code = template.expand().unwrap();

    // Write the generated code
    let compile_info_path = repo_root.join(COMPILE_INFO_RS);
    tokio::fs::write(compile_info_path, generated_code)
        .await
        .unwrap();

    println!("Generated compile_info.rs using just_template");
}