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use crate::{from_base36, optional_data_line, AnimationFrames, Image, ToBase36};

#[derive(Debug, Eq, PartialEq)]
pub struct Tile {
    pub id: u64,
    pub name: Option<String>,
    pub wall: Option<bool>, // this is "optional" in that a tile can have `WAL true|false` or neither
    pub animation_frames: Vec<Image>,
    pub colour_id: Option<u64>,
}

impl Tile {
    fn name_line(&self) -> String {
        optional_data_line("NAME", self.name.as_ref())
    }

    fn wall_line(&self) -> String {
        if self.wall.is_some() {
            format!("\nWAL {}", self.wall.unwrap())
        } else {
            "".to_string()
        }
    }

    fn colour_line(&self) -> String {
        if self.colour_id.is_some() {
            format!("\nCOL {}", self.colour_id.unwrap())
        } else {
            "".to_string()
        }
    }
}

impl From<String> for Tile {
    #[inline]
    fn from(string: String) -> Tile {
        let mut lines: Vec<&str> = string.lines().collect();

        let id = from_base36(&lines[0].replace("TIL ", ""));

        let mut wall = None;
        let mut name = None;
        let mut colour_id = None;

        loop {
            let last_line = lines.pop().unwrap();

            if last_line.starts_with("WAL") {
                wall = Some(last_line.ends_with("true"));
            } else if last_line.starts_with("NAME") {
                name = Some(last_line.replace("NAME ", "").to_string());
            } else if last_line.starts_with("COL") {
                colour_id = Some(last_line.replace("COL ", "").parse().unwrap());
            } else {
                lines.push(last_line);
                break;
            }
        }

        let animation_frames = lines[1..].join("");
        let animation_frames: Vec<&str> = animation_frames.split(">").collect();
        let animation_frames: Vec<Image> = animation_frames
            .iter()
            .map(|&frame| Image::from(frame.to_string()))
            .collect();

        Tile {
            id,
            name,
            wall,
            animation_frames,
            colour_id,
        }
    }
}

impl ToString for Tile {
    #[inline]
    fn to_string(&self) -> String {
        format!(
            "TIL {}\n{}{}{}{}",
            self.id.to_base36(),
            self.animation_frames.to_string(),
            self.name_line(),
            self.wall_line(),
            self.colour_line(),
        )
    }
}

#[cfg(test)]
mod test {
    use crate::tile::Tile;
    use crate::image::Image;

    #[test]
    fn test_tile_from_string() {
        let output = Tile::from(include_str!("test-resources/tile").to_string());

        let expected = Tile {
            id: 35,
            name: Some("concrete 1".to_string()),
            wall: Some(true),
            animation_frames: vec![Image {
                pixels: vec![1; 64],
            }],
            colour_id: None,
        };

        assert_eq!(output, expected);
    }

    #[test]
    fn test_tile_to_string() {
        let output = Tile {
            id: 262,
            name: Some("chequers".to_string()),
            wall: None,
            animation_frames: vec![
                crate::mock::image::chequers_1(),
                crate::mock::image::chequers_2(),
            ],
            colour_id: None,
        }
            .to_string();

        let expected = include_str!("test-resources/tile-chequers").to_string();

        assert_eq!(output, expected);
    }
}