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use core::fmt;

use super::State;


#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct TokenMeta {
    index_start: u64,
    index_end: u64,
    col_start: u64,
    col_end: u64,
    line_start: u64,
    line_end: u64,
}

unsafe impl Send for TokenMeta {}
unsafe impl Sync for TokenMeta {}

impl TokenMeta {

    #[inline]
    pub fn new(
        index_start: u64,
        index_end: u64,
        col_start: u64,
        col_end: u64,
        line_start: u64,
        line_end: u64
    ) -> Self {
        assert!(
            index_end > index_start,
            "token meta error: end index cannot be less than the start row of a token."
        );
        assert!(
            line_end >= line_start,
            "token meta error: end line cannot be less than the start line of a token."
        );

        TokenMeta {
            index_start: index_start,
            index_end: index_end,
            col_start: col_start,
            col_end: col_end,
            line_start: line_start,
            line_end: line_end,
        }
    }

    #[inline(always)]
    pub fn new_state_meta<'a>(current_state: &'a State, state: &'a State) -> TokenMeta {
        TokenMeta::new(
            current_state.index() as u64,
            state.index() as u64,
            current_state.col(),
            state.col(),
            current_state.row(),
            state.row()
        )
    }

    #[inline(always)]
    pub fn index_start(&self) -> u64 { self.index_start }
    #[inline(always)]
    pub fn index_end(&self) -> u64 { self.index_end }

    #[inline(always)]
    pub fn row_start(&self) -> u64 { self.line_start }
    #[inline(always)]
    pub fn row_end(&self) -> u64 { self.line_end }

    #[inline(always)]
    pub fn col_start(&self) -> u64 { self.col_start }
    #[inline(always)]
    pub fn col_end(&self) -> u64 { self.col_end }

    #[inline(always)]
    pub fn line_start(&self) -> u64 { self.line_start }
    #[inline(always)]
    pub fn line_end(&self) -> u64 { self.line_end }

    #[inline(always)]
    pub fn len(&self) -> u64 {
        self.index_end - self.index_start
    }

    #[inline(always)]
    pub fn line_count(&self) -> u64 {
        (self.line_end - self.line_start) + 1
    }

    #[inline(always)]
    pub fn col_count(&self) -> u64 {
        (self.col_end - self.col_start) + 1
    }
}

impl fmt::Display for TokenMeta {
    #[inline(always)]
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Debug::fmt(self, f)
    }
}