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use anyhow::{anyhow, Context, Result};
use std::{env, fs::File, io::Write};
pub mod cmd_line;
pub mod weather;

/// Constants for the information of the program.
pub mod program_info {
    /// The name of the program.
    pub const PROGRAM_NAME: &str = "weather-cli";
    /// The description of the program.
    pub const PROGRAM_DESCRIPTION: &str = "Weather for command-line fans!";
    /// The authors of the program.
    pub const PROGRAM_AUTHORS: &str = "decaplanet";
}

/// Returns the running executable directory.
pub fn get_executable_directory() -> Result<String> {
    let executable_path =
        env::current_exe().context("Couldn't get the execuatable file directory!")?;
    let executable_directory = executable_path
        .parent()
        .context("Couldn't get the execuatable directory!")?;

    if let Some(dir_str) = executable_directory.to_str() {
        return Ok(dir_str.to_string());
    }

    Err(anyhow!("Unable to get the executable directory."))
}

/// Formats the given file name with the executable directory.
pub fn get_json_file(name: &str) -> Result<File> {
    let executable_dir = get_executable_directory()?;

    let file = match File::open(format!("{}/weather-cli-{}.json", executable_dir, name)) {
        Ok(f) => f,
        Err(_) => {
            let mut new_file =
                File::create(format!("{}/weather-cli-{}.json", executable_dir, name))
                    .context("Couldn't create a json file.")?;
            new_file
                .write_all("{}".as_bytes())
                .context("Couldn't create a json file.")?;

            File::open(format!("{}/weather-cli-{}.json", executable_dir, name))
                .context("Couldn't get the json file.")?
        }
    };

    Ok(file)
}