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#[cfg(test)]
mod tests;

///The following are the implemented ANSI escape sequences. More to be added.
#[derive(Debug, PartialEq)]
pub enum AnsiSequence {
    CursorPos(u32, u32),
    CursorUp(u32),
    CursorDown(u32),
    CursorForward(u32),
    CursorBackward(u32),
    CursorSave,
    CursorRestore,
    EraseDisplay,
    EraseLine,
    SetGraphicsMode(Vec<u32>),
    SetMode(u8),
    ResetMode(u8),
    HideCursor,
    ShowCursor,
    CursorToApp,
    SetNewLineMode,
    SetCol132,
    SetSmoothScroll,
    SetReverseVideo,
    SetOriginRelative,
    SetAutoWrap,
    SetAutoRepeat,
    SetInterlacing,
    SetLineFeedMode,
    SetCursorKeyToCursor,
    SetVT52,
    SetCol80,
    SetJumpScrolling,
    SetNormalVideo,
    SetOriginAbsolute,
    ResetAutoWrap,
    ResetAutoRepeat,
    ResetInterlacing,
    SetAlternateKeypad,
    SetNumericKeypad,
    SetUKG0,
    SetUKG1,
    SetUSG0,
    SetUSG1,
    SetG0SpecialChars,
    SetG1SpecialChars,
    SetG0AlternateChar,
    SetG1AlternateChar,
    SetG0AltAndSpecialGraph,
    SetG1AltAndSpecialGraph,
    SetSingleShift2,
    SetSingleShift3,
    SetTopAndBottom(u32, u32),
}

use std::fmt::Display;
impl Display for AnsiSequence {
    fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(formatter, "\u{1b}")?;
        
        use AnsiSequence::*;
        match self {
            CursorPos(line, col) 
                => write!(formatter, "[{};{}H", line, col),
            CursorUp(amt)
                => write!(formatter, "[{}A", amt),
            CursorDown(amt)
                => write!(formatter, "[{}B", amt),
            CursorForward(amt)
                => write!(formatter, "[{}C", amt),
            CursorBackward(amt)
                => write!(formatter, "[{}D", amt),
            CursorSave
                => write!(formatter, "[s"),
            CursorRestore
                => write!(formatter, "[u"),
            EraseDisplay
                => write!(formatter, "[2J"),
            EraseLine
                => write!(formatter, "[K"),
            SetGraphicsMode(vec)
                => {
                    match vec.len() {
                        0 => write!(formatter, "[m"),
                        1 => write!(formatter, "[{}m", vec[0]),
                        2 => write!(formatter, "[{};{}m", vec[0], vec[1]),
                        3 => write!(formatter, "[{};{};{}m", vec[0], vec[1], vec[2]),
                        _ => unreachable!()
                    }
                },
            SetMode(mode)
                => write!(formatter, "[={}h", mode),
            ResetMode(mode)
                => write!(formatter, "[={}l", mode),
            ShowCursor
                => write!(formatter, "[?25h"),
            HideCursor
                => write!(formatter, "[?25l"),
            CursorToApp
                => write!(formatter, "[?1h"),
            SetNewLineMode
                => write!(formatter, "[20h"),
            SetCol132
                => write!(formatter, "[?3h"),
            SetSmoothScroll
                => write!(formatter, "[?4h"),
            SetReverseVideo
                => write!(formatter, "[?5h"),
            SetOriginRelative
                => write!(formatter, "[?6h"),
            SetAutoWrap
                => write!(formatter, "[?7h"),
            SetAutoRepeat
                => write!(formatter, "[?8h"),
            SetInterlacing
                => write!(formatter, "[?9h"),
            SetLineFeedMode
                => write!(formatter, "[20l"),
            SetCursorKeyToCursor
                => write!(formatter, "[?1l"),
            SetVT52
                => write!(formatter, "[?2l"),
            SetCol80
                => write!(formatter, "[?3l"),
            SetJumpScrolling
                => write!(formatter, "[?4l"),
            SetNormalVideo
                => write!(formatter, "[?5l"),
            SetOriginAbsolute
                => write!(formatter, "[?6l"),
            ResetAutoWrap
                => write!(formatter, "[?7l"),
            ResetAutoRepeat
                => write!(formatter, "[?8l"),
            ResetInterlacing
                => write!(formatter, "[?9l"),
            SetAlternateKeypad
                => write!(formatter, "="),
            SetNumericKeypad
                => write!(formatter, ">"),
            SetUKG0
                => write!(formatter, "(A"),
            SetUKG1
                => write!(formatter, ")A"),
            SetUSG0
                => write!(formatter, "(B"),
            SetUSG1
                => write!(formatter, ")B"),
            SetG0SpecialChars
                => write!(formatter, "(0"),
            SetG1SpecialChars
                => write!(formatter, ")0"),
            SetG0AlternateChar
                => write!(formatter, "(1"),
            SetG1AlternateChar
                => write!(formatter, ")1"),
            SetG0AltAndSpecialGraph
                => write!(formatter, "(2"),
            SetG1AltAndSpecialGraph
                => write!(formatter, ")2"),
            SetSingleShift2
                => write!(formatter, "N"),
            SetSingleShift3
                => write!(formatter, "O"),
            SetTopAndBottom(x, y)
                => write!(formatter, "{};{}r", x, y)
        }
    }
}

///This is what is outputted by the parsing iterator.
///Each block contains either straight-up text, or simply
///an ANSI escape sequence.
#[derive(Debug, PartialEq)]
pub enum Output<'a> {
    TextBlock(&'a str),
    Escape(AnsiSequence)
}

impl<'a> Display for Output<'a> {
    fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
        use Output::*;
        match self {
            TextBlock(txt) => write!(formatter, "{}", txt),
            Escape(seq) => write!(formatter, "{}", seq)
        }
    }
}