//! A crate for loading data from the aseprite sprite editor. Should
//! go along well with the tiled crate, I hope!
//!
//! It does not load any actual images, just the metadata. Currently
//! it only loads aseprite's JSON export format, and only when
//! exported in a particular format that has all the options just
//! right. I've yet to find a use case that won't cover though.
//!
//! Automatically exporting a sprite to a given format is documented
//! here: https://www.aseprite.org/docs/cli/ The easy way to export in
//! the right format is to use a command such as `aseprite -b
//! boonga.ase --sheet boonga.png --format json-array --data
//! boonga.json`
//!
//! Otherwise you have to go to `file->export sprite sheet` and select
//! "array" rather than "hash".  Every.  Single.  Time.
//!
//! This has been tested to work with aseprite 1.1.6; newer or older
//! versions have not been tested.

#[macro_use]
extern crate serde_derive;

#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone, Copy)]
pub struct Rect {
    pub x: u32,
    pub y: u32,
    pub w: u32,
    pub h: u32,
}


#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone, Copy)]
pub struct Dimensions {
    pub w: u32,
    pub h: u32,
}


#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
pub struct Frame {
    pub filename: String,
    pub frame: Rect,
    pub rotated: bool,
    pub trimmed: bool,
    #[serde(rename = "spriteSourceSize")]
    pub sprite_source_size: Rect,
    #[serde(rename = "sourceSize")]
    pub source_size: Dimensions,
    pub duration: u32,
}

#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone, Copy)]
pub enum Direction {
    #[serde(rename="forward")]
    Forward,
    #[serde(rename="reverse")]
    Reverse,
    #[serde(rename="pingpong")]
    Pingpong,
}

#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
pub struct Frametag {
    pub name: String,
    pub from: u32,
    pub to: u32,
    pub direction: Direction,
}

// These are listed at:
// https://github.com/aseprite/aseprite/blob/2e3bbe2968da65fa8852ebb94464942bf9cb8870/src/doc/blend_mode.cpp#L17

#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone, Copy)]
pub enum BlendMode {
    #[serde(rename="normal")]
    Normal,
    #[serde(rename="multiply")]
    Multiply,
    #[serde(rename="screen")]
    Screen,
    #[serde(rename="overlay")]
    Overlay,
    #[serde(rename="darken")]
    Darken,
    #[serde(rename="lighten")]
    Lighten,
    #[serde(rename="color_dodge")]
    ColorDodge,
    #[serde(rename="color_burn")]
    ColorBurn,
    #[serde(rename="hard_light")]
    HardLight,
    #[serde(rename="soft_light")]
    SoftLight,
    #[serde(rename="difference")]
    Difference,
    #[serde(rename="exclusion")]
    Exclusion,
    #[serde(rename="hsl_hue")]
    HslHue,
    #[serde(rename="hsl_saturation")]
    HslSaturation,
    #[serde(rename="hsl_color")]
    HslColor,
    #[serde(rename="hsl_luminosity")]
    HslLuminosity,
}

#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
pub struct Layer {
    pub name: String,
    pub opacity: u32,
    #[serde(rename = "blendMode")]
    pub blend_mode: BlendMode,
}


#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
pub struct Metadata {
    pub app: String,
    pub version: String,
    pub format: String,
    pub size: Dimensions,
    pub scale: String, // Surely this should be a number?
    #[serde(rename = "frameTags")]
    pub frame_tags: Option<Vec<Frametag>>,
    pub layers: Option<Vec<Layer>>,
    pub image: Option<String>,
}


#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
pub struct SpritesheetData {
    pub frames: Vec<Frame>,
    pub meta: Metadata,
}


#[cfg(test)]
mod tests {
    extern crate serde_json;

    const S: &'static str = r##"{ "frames": [
   {
    "filename": "boonga 0.ase",
    "frame": { "x": 1, "y": 1, "w": 18, "h": 18 },
    "rotated": false,
    "trimmed": false,
    "spriteSourceSize": { "x": 0, "y": 0, "w": 16, "h": 16 },
    "sourceSize": { "w": 16, "h": 16 },
    "duration": 250
   },
   {
    "filename": "boonga 1.ase",
    "frame": { "x": 20, "y": 1, "w": 18, "h": 18 },
    "rotated": false,
    "trimmed": false,
    "spriteSourceSize": { "x": 0, "y": 0, "w": 16, "h": 16 },
    "sourceSize": { "w": 16, "h": 16 },
    "duration": 250
   }
 ],
 "meta": {
  "app": "http://www.aseprite.org/",
  "version": "1.1.6-dev",
  "image": "boonga.png",
  "format": "RGBA8888",
  "size": { "w": 39, "h": 20 },
  "scale": "1",
  "frameTags": [
   { "name": "testtag", "from": 0, "to": 1, "direction": "forward" }
  ],
  "layers": [
   { "name": "Layer 1", "opacity": 255, "blendMode": "normal" }
  ]
 }
}
"##;


    const S_NO_META: &'static str = r##"{ "frames": [
   {
    "filename": "boonga 0.ase",
    "frame": { "x": 1, "y": 1, "w": 18, "h": 18 },
    "rotated": false,
    "trimmed": false,
    "spriteSourceSize": { "x": 0, "y": 0, "w": 16, "h": 16 },
    "sourceSize": { "w": 16, "h": 16 },
    "duration": 250
   },
   {
    "filename": "boonga 1.ase",
    "frame": { "x": 20, "y": 1, "w": 18, "h": 18 },
    "rotated": false,
    "trimmed": false,
    "spriteSourceSize": { "x": 0, "y": 0, "w": 16, "h": 16 },
    "sourceSize": { "w": 16, "h": 16 },
    "duration": 250
   }
 ],
 "meta": {
  "app": "http://www.aseprite.org/",
  "version": "1.1.6-dev",
  "image": "boonga.png",
  "format": "RGBA8888",
  "size": { "w": 39, "h": 20 },
  "scale": "1"
 }
}
"##;


    #[test]
    fn test_sprite_load_save() {
        let deserialized: super::SpritesheetData = serde_json::from_str(S).unwrap();

        let serialized = serde_json::to_string(&deserialized).unwrap();
        let deserialized_again: super::SpritesheetData = serde_json::from_str(&serialized).unwrap();

        assert_eq!(deserialized, deserialized_again);
    }


    #[test]
    fn test_less_metadata() {
        let deserialized: super::SpritesheetData = serde_json::from_str(S_NO_META).unwrap();

        let serialized = serde_json::to_string(&deserialized).unwrap();
        let deserialized_again: super::SpritesheetData = serde_json::from_str(&serialized).unwrap();

        assert_eq!(deserialized, deserialized_again);
    }

}