use crate::prelude::*;
use nu_engine::WholeStreamCommand;
use nu_errors::ShellError;
use nu_protocol::{Signature, UntaggedValue, Value};
use nu_test_support::{NATIVE_PATH_ENV_SEPARATOR, NATIVE_PATH_ENV_VAR};

pub struct SubCommand;

impl WholeStreamCommand for SubCommand {
    fn name(&self) -> &str {
        "pathvar save"
    }

    fn signature(&self) -> Signature {
        Signature::build("pathvar save")
    }

    fn usage(&self) -> &str {
        "Save the current pathvar to the config file"
    }

    fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        save(args)
    }
}
pub fn save(args: CommandArgs) -> Result<OutputStream, ShellError> {
    let name = args.call_info.name_tag.clone();
    let ctx = &args.context;

    if let Some(global_cfg) = &mut ctx.configs().lock().global_config {
        if let Some(pathvar) = ctx.scope.get_env(NATIVE_PATH_ENV_VAR) {
            let paths: Vec<Value> = pathvar
                .split(NATIVE_PATH_ENV_SEPARATOR)
                .map(Value::from)
                .collect();

            let span_range = 0..paths.len();
            let row = Value::new(
                UntaggedValue::Table(paths),
                Tag::from(Span::from(&span_range)),
            );

            global_cfg.vars.insert("path".to_string(), row);
            global_cfg.write()?;
            ctx.reload_config(global_cfg)?;

            Ok(OutputStream::empty())
        } else {
            Err(ShellError::unexpected("PATH not set"))
        }
    } else {
        let value = UntaggedValue::Error(crate::commands::config::err_no_global_cfg_present())
            .into_value(name);

        Ok(OutputStream::one(value))
    }
}