use crate::{from_base36, optional_data_line, AnimationFrames, Image, Position, ToBase36};
use crate::image::animation_frames_from_string;
use std::str::FromStr;

#[derive(Debug, Eq, PartialEq)]
pub struct Sprite {
    pub id: u64,
    pub name: Option<String>,
    pub animation_frames: Vec<Image>,
    pub dialogue_id: Option<String>,
    pub room_id: Option<u64>,
    pub position: Option<Position>,
    pub colour_id: Option<u64>,
    pub items: Vec<String>,
}

impl Sprite {
    #[inline]
    fn name_line(&self) -> String {
        optional_data_line("NAME", self.name.as_ref())
    }

    #[inline]
    fn dialogue_line(&self) -> String {
        optional_data_line("DLG", self.dialogue_id.as_ref())
    }

    #[inline]
    fn room_position_line(&self) -> String {
        if self.room_id.is_some() && self.position.is_some() {
            format!(
                "\nPOS {} {}",
                self.room_id.unwrap().to_base36(),
                self.position.as_ref().unwrap().to_string()
            )
        } else {
            "".to_string()
        }
    }

    #[inline]
    fn colour_line(&self) -> String {
        optional_data_line("COL", self.colour_id.as_ref())
    }

    #[inline]
    fn item_lines(&self) -> String {
        if self.items.len() == 0 {
            "".to_string()
        } else {
            let lines: Vec<String> = self.items.iter().map(|item| format!("ITM {}", item)).collect();
            format!("\n{}", lines.join("\n"))
        }
    }
}

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

        let id = from_base36(&lines[0].replace("SPR ", ""));
        let mut name = None;
        let mut dialogue_id: Option<String> = None;
        let mut room_id: Option<u64> = None;
        let mut position: Option<Position> = None;
        let mut colour_id: Option<u64> = None;
        let mut items: Vec<String> = Vec::new();

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

            if last_line.starts_with("NAME") {
                name = Some(last_line.replace("NAME ", "").to_string());
            } else if last_line.starts_with("DLG") {
                dialogue_id = Some(last_line.replace("DLG ", "").to_string());
            } else if last_line.starts_with("POS") {
                let last_line = last_line.replace("POS ", "");
                let room_position: Vec<&str> = last_line.split(' ').collect();
                room_id = Some(from_base36(&room_position[0]));

                if room_position.len() < 2 {
                    panic!("Bad room/position for sprite: {}", string);
                }

                position = Some(Position::from_str(room_position[1]).unwrap());
            } else if last_line.starts_with("COL") {
                colour_id = Some(last_line.replace("COL ", "").parse().unwrap());
            } else if last_line.starts_with("ITM") {
                items.push(last_line.replace("ITM ", ""));
            } else {
                lines.push(last_line);
                break;
            }
        }

        items.reverse();

        let animation_frames = animation_frames_from_string(
            lines[1..].join("\n")
        );

        Sprite {
            id,
            name,
            animation_frames,
            dialogue_id,
            room_id,
            position,
            colour_id,
            items
        }
    }
}

impl ToString for Sprite {
    #[inline]
    fn to_string(&self) -> String {
        format!(
            "SPR {}\n{}{}{}{}{}{}",
            self.id.to_base36(),
            self.animation_frames.to_string(),
            self.name_line(),
            self.dialogue_line(),
            self.room_position_line(),
            self.colour_line(),
            self.item_lines(),
        )
    }
}

#[cfg(test)]
mod test {
    use crate::mock;
    use crate::sprite::Sprite;

    #[test]
    fn test_sprite_from_string() {
        let output = Sprite::from(include_str!("test-resources/sprite").to_string());
        let expected = mock::sprite();

        assert_eq!(output, expected);
    }

    #[test]
    fn test_sprite_to_string() {
        assert_eq!(mock::sprite().to_string(), include_str!("test-resources/sprite").to_string());
    }
}