#[cfg(feature = "plugin")]
use crate::config_files::NUSHELL_FOLDER;
use crate::{
    command,
    config_files::{self, setup_config},
};
use log::trace;
#[cfg(feature = "plugin")]
use nu_cli::read_plugin_file;
use nu_cli::{evaluate_commands, evaluate_file, evaluate_repl};
use nu_protocol::{
    engine::{EngineState, Stack},
    report_error_new, PipelineData, Spanned,
};
use nu_utils::utils::perf;

pub(crate) fn run_commands(
    engine_state: &mut EngineState,
    parsed_nu_cli_args: command::NushellCliArgs,
    use_color: bool,
    commands: &Spanned<String>,
    input: PipelineData,
    entire_start_time: std::time::Instant,
) {
    trace!("run_commands");
    let mut stack = Stack::new();
    let start_time = std::time::Instant::now();

    // if the --no-config-file(-n) option is NOT passed, load the plugin file,
    // load the default env file or custom (depending on parsed_nu_cli_args.env_file),
    // and maybe a custom config file (depending on parsed_nu_cli_args.config_file)
    //
    // if the --no-config-file(-n) flag is passed, do not load plugin, env, or config files
    if parsed_nu_cli_args.no_config_file.is_none() {
        #[cfg(feature = "plugin")]
        read_plugin_file(engine_state, parsed_nu_cli_args.plugin_file, NUSHELL_FOLDER);

        perf(
            "read plugins",
            start_time,
            file!(),
            line!(),
            column!(),
            use_color,
        );

        let start_time = std::time::Instant::now();
        // If we have a env file parameter *OR* we have a login shell parameter, read the env file
        if parsed_nu_cli_args.env_file.is_some() || parsed_nu_cli_args.login_shell.is_some() {
            config_files::read_config_file(
                engine_state,
                &mut stack,
                parsed_nu_cli_args.env_file,
                true,
            );
        } else {
            config_files::read_default_env_file(engine_state, &mut stack)
        }

        perf(
            "read env.nu",
            start_time,
            file!(),
            line!(),
            column!(),
            use_color,
        );

        let start_time = std::time::Instant::now();
        // If we have a config file parameter *OR* we have a login shell parameter, read the config file
        if parsed_nu_cli_args.config_file.is_some() || parsed_nu_cli_args.login_shell.is_some() {
            config_files::read_config_file(
                engine_state,
                &mut stack,
                parsed_nu_cli_args.config_file,
                false,
            );
        }

        perf(
            "read config.nu",
            start_time,
            file!(),
            line!(),
            column!(),
            use_color,
        );

        // If we have a login shell parameter, read the login file
        let start_time = std::time::Instant::now();
        if parsed_nu_cli_args.login_shell.is_some() {
            config_files::read_loginshell_file(engine_state, &mut stack);
        }

        perf(
            "read login.nu",
            start_time,
            file!(),
            line!(),
            column!(),
            use_color,
        );
    }

    // Before running commands, set up the startup time
    engine_state.set_startup_time(entire_start_time.elapsed().as_nanos() as i64);

    // Regenerate the $nu constant to contain the startup time and any other potential updates
    engine_state.generate_nu_constant();

    let start_time = std::time::Instant::now();
    if let Err(err) = evaluate_commands(
        commands,
        engine_state,
        &mut stack,
        input,
        parsed_nu_cli_args.table_mode,
        parsed_nu_cli_args.no_newline.is_some(),
    ) {
        report_error_new(engine_state, &err);
        std::process::exit(1);
    }
    perf(
        "evaluate_commands",
        start_time,
        file!(),
        line!(),
        column!(),
        use_color,
    );
}

pub(crate) fn run_file(
    engine_state: &mut EngineState,
    parsed_nu_cli_args: command::NushellCliArgs,
    use_color: bool,
    script_name: String,
    args_to_script: Vec<String>,
    input: PipelineData,
) {
    trace!("run_file");
    let mut stack = Stack::new();

    // if the --no-config-file(-n) option is NOT passed, load the plugin file,
    // load the default env file or custom (depending on parsed_nu_cli_args.env_file),
    // and maybe a custom config file (depending on parsed_nu_cli_args.config_file)
    //
    // if the --no-config-file(-n) flag is passed, do not load plugin, env, or config files
    if parsed_nu_cli_args.no_config_file.is_none() {
        let start_time = std::time::Instant::now();
        #[cfg(feature = "plugin")]
        read_plugin_file(engine_state, parsed_nu_cli_args.plugin_file, NUSHELL_FOLDER);
        perf(
            "read plugins",
            start_time,
            file!(),
            line!(),
            column!(),
            use_color,
        );

        let start_time = std::time::Instant::now();
        // only want to load config and env if relative argument is provided.
        if parsed_nu_cli_args.env_file.is_some() {
            config_files::read_config_file(
                engine_state,
                &mut stack,
                parsed_nu_cli_args.env_file,
                true,
            );
        } else {
            config_files::read_default_env_file(engine_state, &mut stack)
        }
        perf(
            "read env.nu",
            start_time,
            file!(),
            line!(),
            column!(),
            use_color,
        );

        let start_time = std::time::Instant::now();
        if parsed_nu_cli_args.config_file.is_some() {
            config_files::read_config_file(
                engine_state,
                &mut stack,
                parsed_nu_cli_args.config_file,
                false,
            );
        }
        perf(
            "read config.nu",
            start_time,
            file!(),
            line!(),
            column!(),
            use_color,
        );
    }

    // Regenerate the $nu constant to contain the startup time and any other potential updates
    engine_state.generate_nu_constant();

    let start_time = std::time::Instant::now();
    if let Err(err) = evaluate_file(
        script_name,
        &args_to_script,
        engine_state,
        &mut stack,
        input,
    ) {
        report_error_new(engine_state, &err);
        std::process::exit(1);
    }
    perf(
        "evaluate_file",
        start_time,
        file!(),
        line!(),
        column!(),
        use_color,
    );

    let start_time = std::time::Instant::now();
    let last_exit_code = stack.get_env_var(&*engine_state, "LAST_EXIT_CODE");
    if let Some(last_exit_code) = last_exit_code {
        let value = last_exit_code.as_int();
        if let Ok(value) = value {
            if value != 0 {
                std::process::exit(value as i32);
            }
        }
    }
    perf(
        "get exit code",
        start_time,
        file!(),
        line!(),
        column!(),
        use_color,
    );
}

pub(crate) fn run_repl(
    engine_state: &mut EngineState,
    parsed_nu_cli_args: command::NushellCliArgs,
    entire_start_time: std::time::Instant,
) -> Result<(), miette::ErrReport> {
    trace!("run_repl");
    let mut stack = Stack::new();
    let start_time = std::time::Instant::now();

    if parsed_nu_cli_args.no_config_file.is_none() {
        setup_config(
            engine_state,
            &mut stack,
            #[cfg(feature = "plugin")]
            parsed_nu_cli_args.plugin_file,
            parsed_nu_cli_args.config_file,
            parsed_nu_cli_args.env_file,
            parsed_nu_cli_args.login_shell.is_some(),
        );
    }

    // Reload use_color from config in case it's different from the default value
    let use_color = engine_state.get_config().use_ansi_coloring;
    perf(
        "setup_config",
        start_time,
        file!(),
        line!(),
        column!(),
        use_color,
    );

    let start_time = std::time::Instant::now();
    let ret_val = evaluate_repl(
        engine_state,
        stack,
        config_files::NUSHELL_FOLDER,
        parsed_nu_cli_args.execute,
        parsed_nu_cli_args.no_std_lib,
        entire_start_time,
    );
    perf(
        "evaluate_repl",
        start_time,
        file!(),
        line!(),
        column!(),
        use_color,
    );

    ret_val
}