use {
	crate::result::Result,
	serde::Serialize,
	sqlparser::ast::{ObjectName, TableAlias, TableFactor},
	std::fmt::Debug,
	thiserror::Error,
};

#[derive(Error, Serialize, Debug, PartialEq)]
pub enum TableError {
	#[error("unreachable")]
	Unreachable,

	#[error("TableFactorNotSupported")]
	TableFactorNotSupported,
}

pub struct Table<'a> {
	name: &'a String,
	alias: Option<&'a String>,
}

impl<'a> Table<'a> {
	pub fn new(table_factor: &'a TableFactor) -> Result<Self> {
		match table_factor {
			TableFactor::Table { name, alias, .. } => {
				let name = get_name(name)?;
				let alias = alias.as_ref().map(|TableAlias { name, .. }| &name.value);

				Ok(Self { name, alias })
			}
			_ => Err(TableError::TableFactorNotSupported.into()),
		}
	}

	pub fn get_name(&self) -> &'a String {
		self.name
	}

	pub fn get_alias(&self) -> &'a String {
		match self.alias {
			Some(alias) => alias,
			None => self.name,
		}
	}
}

pub fn get_name(table_name: &ObjectName) -> Result<&String> {
	let ObjectName(idents) = table_name;

	idents
		.last()
		.map(|ident| &ident.value)
		.ok_or_else(|| TableError::Unreachable.into())
}