use std::ops::Deref;

pub mod plain;
pub mod rust_lang;

#[derive(Debug, Clone)]
pub enum Language {
    PlainText,
}

#[derive(Debug, Clone)]
pub enum TokenType {
    Whitespace { token: Token },
    Keyword { token: Token },
    String { token: Token },
    Number { token: Token },
    Identifier { token: Token },
    Literal { token: Token },
    Comment { token: Token },
    Operator { token: Token },
    Separator { token: Token },
}

impl TokenType {
    pub fn move_to(&self, line: usize, character: usize, start: usize, end: usize) -> Self {
        match self {
            TokenType::Whitespace { token } => TokenType::Whitespace {
                token: token.move_to(line, character, start, end),
            },
            TokenType::Keyword { token } => TokenType::Keyword {
                token: token.move_to(line, character, start, end),
            },
            TokenType::String { token } => TokenType::String {
                token: token.move_to(line, character, start, end),
            },
            TokenType::Number { token } => TokenType::Number {
                token: token.move_to(line, character, start, end),
            },
            TokenType::Identifier { token } => TokenType::Identifier {
                token: token.move_to(line, character, start, end),
            },
            TokenType::Literal { token } => TokenType::Literal {
                token: token.move_to(line, character, start, end),
            },
            TokenType::Comment { token } => TokenType::Comment {
                token: token.move_to(line, character, start, end),
            },
            TokenType::Operator { token } => TokenType::Operator {
                token: token.move_to(line, character, start, end),
            },
            TokenType::Separator { token } => TokenType::Separator {
                token: token.move_to(line, character, start, end),
            },
        }
    }

    pub fn is_new_line(&self) -> bool {
        match self {
            TokenType::Whitespace { token } => token.text().as_str() == "\n",
            _ => false,
        }
    }

    pub fn is_space(&self) -> bool {
        match self {
            TokenType::Whitespace { token } => token.text().as_str() == " ",
            _ => false,
        }
    }
}

impl Deref for TokenType {
    type Target = Token;

    fn deref(&self) -> &<Self as Deref>::Target {
        match self {
            TokenType::Whitespace { token } => token,
            TokenType::Keyword { token } => token,
            TokenType::String { token } => token,
            TokenType::Number { token } => token,
            TokenType::Identifier { token } => token,
            TokenType::Literal { token } => token,
            TokenType::Comment { token } => token,
            TokenType::Operator { token } => token,
            TokenType::Separator { token } => token,
        }
    }
}

#[derive(Debug, Clone)]
pub struct Token {
    line: usize,
    character: usize,
    start: usize,
    end: usize,
    text: String,
}

#[derive(Debug, Clone, Copy)]
pub struct Span {
    pub lo: usize,
    pub hi: usize,
}

impl Token {
    pub fn new(text: String, line: usize, character: usize, start: usize, end: usize) -> Self {
        Self {
            text,
            line,
            character,
            start,
            end,
        }
    }

    pub fn text(&self) -> &String {
        &self.text
    }

    pub fn line(&self) -> usize {
        self.line.clone()
    }

    pub fn character(&self) -> usize {
        self.character.clone()
    }

    pub fn start(&self) -> usize {
        self.start.clone()
    }

    pub fn end(&self) -> usize {
        self.end.clone()
    }

    pub fn move_to(&self, line: usize, character: usize, start: usize, end: usize) -> Self {
        Self {
            text: self.text.clone(),
            line,
            character,
            start,
            end,
        }
    }
}

pub fn parse(text: String, language: Language) -> Vec<TokenType> {
    match language {
        Language::PlainText => plain::lexer::Lexer::new(text.as_str())
//            .inspect(|tok| println!("tok: {:?}", tok))
            .map(|t| t.0)
            .collect(),
    }
}