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use std::fs;

use abscissa_core::clap::Parser;
use abscissa_core::{Command, Runnable};

use crate::conclude::Output;
use crate::config;
use crate::prelude::*;

/// In order to validate the configuration file the command will check that the file exists,
/// that it is readable and not empty. It will then check the validity of the fields inside
/// the file.
#[derive(Command, Debug, Parser)]
pub struct ValidateCmd {}

impl Runnable for ValidateCmd {
    /// Validate the loaded configuration.
    fn run(&self) {
        let config = app_config();
        trace!("loaded configuration: {:#?}", *config);

        // Verify that the configuration file has been found.
        match config::config_path() {
            Some(p) => {
                // If there is a configuration file, verify that it is readable and not empty.
                match fs::read_to_string(p.clone()) {
                    Ok(content) => {
                        if content.is_empty() {
                            Output::error("the configuration file is empty").exit();
                        }
                    }
                    Err(e) => {
                        Output::error(format!("error reading the configuration file {p:?}: {e}"))
                            .exit()
                    }
                }
            }
            None => Output::error("no configuration file found").exit(),
        }

        // No need to output the underlying error, this is done already when the application boots.
        // See `application::CliApp::after_config`.
        match config::validate_config(&config) {
            Ok(_) => Output::success("configuration is valid").exit(),
            Err(_) => Output::error("configuration is invalid").exit(),
        }
    }
}