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use fmt::Debug;

use crate::{Context, Vector};
use std::{error::Error, fmt};

///Action is type for command action. It returns Result<ActionResult, ActionError>.

pub type Action = fn(Context) -> Result<ActionResult, ActionError>;

#[derive(Debug)]
///ActionResult stores result of action.

pub enum ActionResult {
	///Done shows that action is done.

	Done,
	/// ShowHelpRequest shows that action requested to show help.

	ShowHelpRequest(Context),
	/// ShowHelpReq shows that action requested to show relative's help.

	ShowOtherHelpReq(Context, usize, Vector<String>),
	/// Shows return Context and Action as result for parse and run.

	Result(Context, Action),
	/// Custom result

	Custom(Box<dyn CustomResult>),
}

/// Empty Trait for Custom Result.

pub trait CustomResult {
	/// function for show debug message

	fn debug_message(&self) -> &str;
}

impl Debug for dyn CustomResult {
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
		write!(f, "{}", self.debug_message())
	}
}

/// ActionError stores error of action.

#[derive(Debug)]
pub struct ActionError {
	/// ActionError's value

	pub value: String,
	/// ActionError's Kind

	pub kind: ActionErrorKind,
	/// context is a field for storing context that error occured

	pub context: Context,
	/// If there is an error which is not ActionError, related_error can stores it.

	pub related_error: Option<Box<dyn Error>>,
	/// printed flag. If this is true, this shows error is not printed yet.

	pub printed: bool,
}

/// ErrorKind of ActionError

#[derive(Debug)]
pub enum ActionErrorKind {
	/// Shows a custom(Normal) error

	Custom,
	/// Shows that no action is registered to specidied command.

	NoActionRegistered,
	/// Shows None.

	None,
}

impl ActionError {
	/// Creates new ActionError.

	pub fn new<T: Into<String>>(
		value: T,
		kind: ActionErrorKind,
		context: Context,
		related_error: Option<Box<dyn Error>>,
	) -> Self {
		Self {
			value: value.into(),
			kind,
			context,
			related_error,
			printed: false,
		}
	}

	/// Creates new ActionError without (not action) error info.

	pub fn without_related_error(value: String, kind: ActionErrorKind, context: Context) -> Self {
		Self {
			value,
			kind,
			context,
			related_error: None,
			printed: false,
		}
	}
}

impl fmt::Display for ActionError {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> fmt::Result {
		match self.kind {
			ActionErrorKind::Custom => write!(f, "{}", self.value),
			ActionErrorKind::NoActionRegistered => {
				write!(f, "{} does not have its own action.", self.value)
			}
			ActionErrorKind::None => write!(f, "no action error"),
		}

		//write!(f, "{}", description)

	}
}

impl Error for ActionError {}