use std::collections::HashMap;
use std::fs;
use serde_derive::{Serialize, Deserialize};

#[derive(Debug, Eq, PartialEq, Serialize, Deserialize)]
pub struct Colour {
    red: u8,
    green: u8,
    blue: u8,
    alpha: u8,
}

impl Colour {
    pub fn from(colours: Vec<u8>) -> Colour {
        const ZERO: u8 = 0;
        Colour {
            red:   *colours.get(0).unwrap_or(&ZERO),
            green: *colours.get(1).unwrap_or(&ZERO),
            blue:  *colours.get(2).unwrap_or(&ZERO),
            alpha: *colours.get(3).unwrap_or(&255),
        }
    }

    pub fn to_vec(&self) -> Vec<u8> {
        vec![self.red, self.green, self.blue, self.alpha]
    }
}

#[derive(Debug, Eq, PartialEq, Serialize, Deserialize)]
pub struct Palette {
    name: String,
    colours: Vec<Colour>,
}

impl Palette {
    pub fn from(name: &str, toml: &str) -> Self {
        let intermediate: IntermediatePalette = toml::from_str(toml).unwrap();

        println!("palette name: {}", name);

        for colour in &intermediate.colours {
            println!("palette colour: {}{}{}", colour[0], colour[1], colour[2]);
        }

        Palette {
            name: name.to_string(),
            colours: intermediate.colours.iter().map(|vec| {
                Colour::from(vec.clone())
            }).collect(),
        }
    }

    pub fn from_file(path: String) -> Self {
        // todo get name without extension
        let name = "blah";
        let toml = fs::read_to_string(path).unwrap();
        Self::from(name, &toml)
    }
}

/// for toml purposes
#[derive(Serialize, Deserialize)]
struct IntermediatePalette {
    colours: Vec<Vec<u8>>,
}

/// for toml purposes
#[derive(Serialize, Deserialize)]
struct IntermediatePalettes {
    /// singular so each palette section is named "palette" instead of "palettes" in toml
    palette: Vec<IntermediatePalette>,
}

impl IntermediatePalettes {
    pub fn from_dir() -> Self {
        Self {
            palette: vec![]
        }
    }
}

#[derive(Eq, Hash, PartialEq)]
pub struct Position {
    x: u8,
    y: u8,
}

#[derive(Debug, Eq, PartialEq, Serialize, Deserialize)]
pub struct Image {
    name: String,
    /// colour indexes
    pixels: Vec<u8>,
}

impl Image {
    fn from(intermediate: IntermediateImage) -> Image {
        Image {
            name: intermediate.name.to_owned(),
            pixels: intermediate.pixels.split_whitespace().collect::<String>().chars().map(
                |char|char as u8
            ).collect()
        }
    }
}

/// for toml purposes
#[derive(Debug, Serialize, Deserialize)]
struct IntermediateImages {
    /// singular so each image is named "image" instead of "images" in toml
    image: Vec<IntermediateImage>,
}

impl IntermediateImages {
    fn to_images(&self) -> Vec<Image> {
        self.image.iter().map(|intermediate|
            Image::from(intermediate.clone())
        ).collect()
    }
}

#[derive(Clone, Debug, Serialize, Deserialize)]
struct IntermediateImage {
    name: String,
    pixels: String,
}

impl IntermediateImage {
    // todo refactor
    fn from(image: Image) -> IntermediateImage {
        let mut string = "\n".to_string();

        let sqrt = (image.pixels.len() as f64).sqrt() as usize;
        for line in image.pixels.chunks(sqrt) {
            for pixel in line {
                string.push_str(&format!("{}", *pixel));
            }
            string.push('\n');
        }

        IntermediateImage {
            name: image.name.to_owned(),
            /// todo wtf? I guess this crate doesn't handle multiline strings correctly
            pixels: format!("\"\"{}\"\"", string),
        }
    }
}

// #[derive(Serialize, Deserialize)]
// pub struct Thing {
//     name: Option<String>,
//     /// image name
//     image: String,
// }
//

pub struct Room {
    name: String,
    width: u8,
    height: u8,
    /// thing names and their positions
    background: HashMap<Position, String>,
    foreground: HashMap<Position, String>,
}

#[derive(Serialize, Deserialize)]
struct IntermediateRoom {
    name: String,
    background: Vec<String>,
    foreground: Vec<String>,
}

impl IntermediateRoom {
    fn from(room: Room) -> IntermediateRoom {
        fn hashmap_to_vec(hash: HashMap<Position, String>, width: u8, height: u8) -> Vec<String> {
            let mut thing_ids = Vec::new();

            while thing_ids.len() < (width * height) as usize {
                thing_ids.push(String::new());
            }

            thing_ids
        }

        IntermediateRoom {
            name: "".to_string(),
            background: vec![],
            foreground: vec![]
        }
    }
}

// #[derive(Serialize, Deserialize)]
// pub enum DataType {
//     Image,
//     Integer,
//     Palette,
//     Room,
//     Script,
//     String,
//     Thing,
//     Variable,
// }
//
// /// todo refactor, this is stupid
// #[derive(Serialize, Deserialize)]
// pub struct Value {
//     data_type: DataType,
//     image: Option<String>,
//     integer: Option<u64>,
//     palette: Option<String>,
//     room: Option<String>,
//     script: Option<String>,
//     string: Option<String>,
//     thing: Option<String>,
//     variable: Option<String>,
// }
//
// #[derive(Serialize, Deserialize)]
// pub struct Variable {
//     name: String,
//     data_type: DataType,
//     default: Value,
// }
//
// #[derive(Serialize, Deserialize)]
// pub struct Parameter {
//     name: String,
//     data_type: DataType,
//     default: Value,
// }
//
// #[derive(Serialize, Deserialize)]
// pub struct Script {
//     name: Option<String>,
//     params: Vec<Parameter>,
//     script: String,
// }
//
// #[derive(Serialize, Deserialize)]
// pub struct ScriptInstance {
//     script: String,
//     params: HashMap<String, Value>,
// }
//
// #[derive(Serialize, Deserialize)]
// pub struct ScriptCollection {
//     scripts: Vec<ScriptInstance>,
//     /// as well as many named scripts, a trigger can have one anonymous script
//     anonymous: Option<String>,
// }
//
// #[derive(Serialize, Deserialize)]
// pub struct Version {
//     major: u8,
//     minor: u8,
// }
//
// impl Version {
//     pub fn default() -> Version {
//         Version { major: 0, minor: 1 }
//     }
// }

#[derive(Debug, Eq, PartialEq, Serialize, Deserialize)]
pub struct Config {
    /// used in the window title bar
    name: Option<String>,
    width: u8,
    height: u8,
    /// animation rate in milliseconds
    tick: u64,
    /// if this is not specified, the game will pick the first room it finds
    starting_room: Option<String>,
}

#[derive(Serialize, Deserialize)]
pub struct Game {
    config: Config,
//     palettes: Vec<Palette>,
//     variables: Vec<Variable>,
//     triggers: HashMap<String, ScriptCollection>,
}
//
// #[derive(Debug)]
// pub struct GameParseError;
//
// impl Game {
//     pub fn from(s: &str) -> Result<Game, GameParseError> {
//         let result = toml::from_str(s);
//         if result.is_ok() {
//             Ok(result.unwrap())
//         } else {
//             Err(GameParseError)
//         }
//     }
// }
//

mod mock {
    pub(crate) mod image {
        use crate::Image;

        pub fn bg() -> Image {
            Image {
                name: "bg".to_string(),
                pixels: vec![
                    0,0,0,0,0,0,0,0,
                    0,0,0,0,0,0,0,0,
                    0,0,0,0,0,0,0,0,
                    0,0,0,0,0,0,0,0,
                    0,0,0,0,0,0,0,0,
                    0,0,0,0,0,0,0,0,
                    0,0,0,0,0,0,0,0,
                    0,0,0,0,0,0,0,0,
                ]
            }
        }

        pub fn block() -> Image {
            Image {
                name: "block".to_string(),
                pixels: vec![
                    1,1,1,1,1,1,1,1,
                    1,0,0,0,0,0,0,1,
                    1,0,0,0,0,0,0,1,
                    1,0,0,1,1,0,0,1,
                    1,0,0,1,1,0,0,1,
                    1,0,0,0,0,0,0,1,
                    1,0,0,0,0,0,0,1,
                    1,1,1,1,1,1,1,1,
                ]
            }
        }

        pub fn avatar() -> Image {
            Image {
                name: "avatar".to_string(),
                pixels: vec![
                    0,0,0,2,2,0,0,0,
                    0,0,0,2,2,0,0,0,
                    0,0,0,2,2,0,0,0,
                    0,0,2,2,2,2,0,0,
                    0,2,2,2,2,2,2,0,
                    2,0,2,2,2,2,0,2,
                    0,0,2,0,0,2,0,0,
                    0,0,2,0,0,2,0,0,
                ]
            }
        }

        pub fn cat() -> Image {
            Image {
                name: "cat".to_string(),
                pixels: vec![
                    0,0,0,0,0,0,0,0,
                    0,0,0,0,0,0,0,0,
                    0,2,0,2,0,0,0,2,
                    0,2,2,2,0,0,0,2,
                    0,2,2,2,0,0,2,0,
                    0,2,2,2,2,2,0,0,
                    0,0,2,2,2,2,0,0,
                    0,0,2,0,0,2,0,0,
                ]
            }
        }
    }

    pub(crate) mod palette {
        use crate::{Palette, Colour, IntermediatePalette};

        pub(crate) fn intermediate() -> IntermediatePalette {
            IntermediatePalette {
                colours: vec![
                    vec![0,0,0,0],
                    vec![0,81,104,255],
                    vec![118,159,155,255],
                    vec![155,155,155,255],
                ]
            }
        }

        pub(crate) fn default() -> Palette {
            Palette {
                name: "blueprint".to_string(),
                colours: vec![
                    Colour { red: 0, green: 0, blue: 0, alpha: 0 },
                    Colour { red: 0, green: 81, blue: 104, alpha: 255 },
                    Colour { red: 118, green: 159, blue: 155, alpha: 255 },
                    Colour { red: 155, green: 155, blue: 155, alpha: 255 },
                ],
            }
        }
    }
}

#[cfg(test)]
mod test {
    use crate::{Game, Config, Palette, Colour, Image, IntermediatePalettes, IntermediateImage, IntermediateImages};

    #[test]
    fn test_config_from_toml() {
        let output: Config = toml::from_str(include_str!("test-resources/basic/game.toml")).unwrap();
        let expected = Config {
            name: Some("Write your game's title here".to_string()),
            width: 16,
            height: 9,
            tick: 400,
            starting_room: Some("example room".to_string())
        };
        assert_eq!(output, expected);
    }

    #[test]
    fn test_config_to_toml() {
        let output = toml::to_string(&Config {
            name: Some("Write your game's title here".to_string()),
            width: 16,
            height: 9,
            tick: 400,
            starting_room: Some("example room".to_string())
        }).unwrap();
        let expected = include_str!("test-resources/basic/game.toml");
        assert_eq!(&output, expected);
    }

    #[test]
    fn test_palette_from_toml() {
        let output = Palette::from(
            "blueprint",
            include_str!("test-resources/basic/palettes/blueprint.toml")
        );
        let expected = crate::mock::palette::default();
        assert_eq!(output, expected);
    }

    #[test]
    fn test_palette_to_toml() {
        let intermediate = crate::mock::palette::intermediate();
        let output = toml::to_string(&intermediate).unwrap();
        let expected = include_str!("test-resources/basic/palettes/blueprint.toml");
        assert_eq!(&output, expected);
    }

    // #[test]
    // fn test_image_from_toml() {
    //     let str = include_str!("test-resources/basic/images.toml");
    //     let output: Image = toml::from_str(str).unwrap();
    //     let expected = crate::mock::image::avatar();
    //     assert_eq!(output, expected);
    // }

    #[test]
    fn test_colour_from_intermediate() {
        let output = Colour::from(vec![64, 128, 192, 255]);
        let expected = Colour { red: 64, green: 128, blue: 192, alpha: 255 };
        assert_eq!(output, expected);
    }

    #[test]
    fn test_colour_to_intermediate() {
        let output = Colour { red: 64, green: 128, blue: 192, alpha: 255 }.to_vec();
        let expected = vec![64, 128, 192, 255];
        assert_eq!(output, expected);
    }

    // #[test]
    // fn test_images_from_intermediate() {
    //     let str = include_str!("test-resources/basic/images.toml");
    //     let output: Vec<IntermediateImage> = toml::from_str(str).unwrap();
    //     print!("{}", output.len());
    // }

    // #[test]
    // fn test_images_to_toml() {
    //     let images = IntermediateImages {
    //         image: vec![
    //             IntermediateImage::from(crate::mock::image::bg()),
    //             IntermediateImage::from(crate::mock::image::block()),
    //             IntermediateImage::from(crate::mock::image::avatar()),
    //             IntermediateImage::from(crate::mock::image::cat()),
    //         ]
    //     };
    //
    //     let output = toml::to_string(&images).unwrap();
    //     let expected = include_str!("test-resources/basic/images.toml");
    //
    //     // I think this is failing because one has escaped quotation marks and one has normal ones(??)
    //     assert_eq!(output, expected);
    // }

    // #[test]
    // fn test_images_from_toml() {
    //     let str = include_str!("test-resources/basic/images.toml");
    //     let output: IntermediateImages = toml::from_str(str).unwrap();
    //     let output = output.to_images();
    //     let expected = vec![
    //         crate::mock::image::bg(),
    //         crate::mock::image::block(),
    //         crate::mock::image::avatar(),
    //         crate::mock::image::cat(),
    //     ];
    //     assert_eq!(output, expected);
    // }
}