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use crate::{Exit, ExitInstance, Instance, mock, Position};

#[derive(Debug, Eq, PartialEq)]
pub struct Room {
    pub(crate) id: String,
    pub(crate) palette: String, // id
    pub(crate) name: Option<String>,
    pub(crate) tiles: Vec<String>, // tile ids
    pub(crate) items: Vec<Instance>,
    pub(crate) exits: Vec<ExitInstance>,
    pub(crate) endings: Vec<Instance>,
}

impl From<String> for Room {
    fn from(string: String) -> Room {
        // todo handle room_format?
        let mut lines: Vec<&str> = string.lines().collect();
        let id = lines[0].replace("ROOM ", "");
        let mut name = None;
        let mut palette = "0".to_string();
        let mut items: Vec<Instance> = Vec::new();
        let mut exits: Vec<ExitInstance> = Vec::new();
        let mut endings: Vec<Instance> = 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("PAL") {
                palette = last_line.replace("PAL ", "").to_string();
            } else if last_line.starts_with("ITM") {
                let last_line = last_line.replace("ITM ", "");
                let item_position: Vec<&str> = last_line.split(' ').collect();
                let item_id = item_position[0];
                let position = item_position[1];
                let position = Position::from(position.to_string());

                items.push(Instance { position, id: item_id.to_string() });
            } else if last_line.starts_with("EXT") {
                let last_line = last_line.replace("EXT ", "");
                let parts: Vec<&str> = last_line.split(' ').collect();
                let position = Position::from(parts[0].to_string());
                let exit = Exit::from(format!("{} {}", parts[1], parts[2]));

                exits.push(ExitInstance { position, exit });
            } else if last_line.starts_with("END") {
                let last_line = last_line.replace("END ", "");
                let ending_position: Vec<&str> = last_line.split(' ').collect();
                let ending = ending_position[0].to_string();
                let position = ending_position[1].to_string();
                let position = Position::from(position);

                endings.push(Instance { position, id: ending });
            } else {
                lines.push(last_line);
                break;
            }
        }

        let lines = &lines[1..];

        let mut tiles: Vec<String> = Vec::new();

        for line in lines.into_iter() {
            let line: Vec<&str> = line.split(",").collect();

            for tile_id in line {
                tiles.push(tile_id.to_string());
            }
        }

        Room { id, palette, name, tiles, items, exits, endings }
    }
}

#[test]
fn test_room_from_string() {
    assert_eq!(
        Room::from(include_str!("../test/resources/room").to_string()),
        mock::room()
    );
}

impl ToString for Room {
    fn to_string(&self) -> String {
        let mut tiles = String::new();
        let mut items = String::new();
        let mut exits = String::new();
        let mut endings = String::new();

        let sqrt = (self.tiles.len() as f64).sqrt() as usize; // 8 for SD, 16 for HD
        for line in self.tiles.chunks(sqrt) {
            for tile in line {
                tiles.push_str(&format!("{},", tile));
            }
            tiles.pop(); // remove trailing comma
            tiles.push_str("\n");
        }
        tiles.pop(); // remove trailing newline

        for instance in &self.items {
            items.push_str(
                &format!("\nITM {} {}", instance.id, instance.position.to_string())
            );
        }

        for instance in &self.exits {
            exits.push_str(
                &format!(
                    "\nEXT {} {}",
                    instance.position.to_string(),
                    instance.exit.to_string(),
                )
            );
        }

        for instance in &self.endings {
            endings.push_str(
                &format!("\nEND {} {}", instance.id, instance.position.to_string())
            );
        }

        format!(
            "ROOM {}\n{}{}{}{}{}\nPAL {}",
            self.id,
            tiles,
            if self.name.as_ref().is_some() { format!("\nNAME {}", self.name.as_ref().unwrap()) } else { "".to_string() },
            items,
            exits,
            endings,
            self.palette
        )
    }
}

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