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use lazy_static::lazy_static;
use serde::{Deserialize, Serialize};
use syntect::easy::HighlightLines;
use syntect::highlighting::ThemeSet;
use syntect::parsing::SyntaxSet;

#[derive(Serialize, Deserialize, Copy, Clone, PartialEq, Debug)]
pub struct RGBA {
    pub red: f64,
    pub green: f64,
    pub blue: f64,
    pub alpha: f64,
}

impl RGBA {
    pub fn new(red: f64, green: f64, blue: f64, alpha: f64) -> Self {
        RGBA {
            red,
            green,
            blue,
            alpha,
        }
    }
}

#[derive(Serialize, Deserialize, Copy, Clone, PartialEq, Debug)]
pub struct RGB {
    pub red: f64,
    pub green: f64,
    pub blue: f64,
}

impl RGB {
    pub fn new(red: f64, green: f64, blue: f64) -> Self {
        RGB { red, green, blue }
    }
}

#[derive(Serialize, Deserialize, Clone, PartialEq, Debug)]
pub struct ColoredSegment {
    pub foreground: RGBA,
    pub background: RGBA,
    pub content: String,
}

impl ColoredSegment {
    pub fn new(string: String) -> Self {
        ColoredSegment {
            foreground: RGBA::new(0f64, 0f64, 0f64, 1f64),
            background: RGBA::new(0f64, 0f64, 0f64, 0f64),
            content: string,
        }
    }

    pub fn set_foreground(&mut self, color: RGBA) {
        self.foreground = color;
    }

    pub fn set_background(&mut self, color: RGBA) {
        self.background = color;
    }
}

#[derive(Serialize, Deserialize, Clone, PartialEq, Debug)]
pub struct ColoredString {
    pub segments: Vec<ColoredSegment>,
}

impl ColoredString {
    pub fn new() -> Self {
        ColoredString {
            segments: Vec::new(),
        }
    }

    pub fn add(&mut self, segment: ColoredSegment) {
        self.segments.push(segment);
    }
}

lazy_static! {
    static ref THEME_SET: ThemeSet = ThemeSet::load_defaults();
    static ref SYNTAX_SET: SyntaxSet = SyntaxSet::load_defaults_newlines();
}

pub fn highlight(
    code: String,
    lang: String,
    theme: String,
) -> Result<ColoredString, Box<rhai::EvalAltResult>> {
    let syntax = match SYNTAX_SET.find_syntax_by_extension(&lang) {
        Some(syntax) => syntax,
        None => return Err(format!("Syntax {} not found.", lang).into()),
    };

    let theme = match THEME_SET.themes.get(&theme) {
        Some(theme) => theme,
        None => return Err(format!("Theme {} not found.", theme).into()),
    };

    let mut h = HighlightLines::new(syntax, theme);
    let mut cs = ColoredString::new();

    for line in code.lines() {
        for (style, code) in h.highlight(line, &SYNTAX_SET).iter() {
            let mut segment = ColoredSegment::new((*code).into());
            let fg = style.foreground;
            segment.set_foreground(RGBA::new(
                fg.r as f64 / 256f64,
                fg.g as f64 / 256f64,
                fg.b as f64 / 256f64,
                1f64,
            ));
            cs.add(segment);
        }
        cs.add(ColoredSegment::new("\n".into()));
    }

    cs.segments.pop();

    Ok(cs)
}

#[derive(Copy, Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct Size {
    pub x: f64,
    pub y: f64,
}

impl Size {
    pub fn new(x: f64, y: f64) -> Self {
        Size { x, y }
    }

    pub fn scaled(&self, factor: f64) -> Self {
        Self::new(self.x * factor, self.y * factor)
    }
}

impl Default for Size {
    fn default() -> Self {
        Size::new(0f64, 0f64)
    }
}

#[derive(Clone, Copy, PartialEq, Debug, Serialize, Deserialize)]
pub enum Anchor {
    North,
    South,
    East,
    West,
    Center,
}

#[derive(Clone, PartialEq, Debug, Serialize, Deserialize)]
pub struct AudioItem {
    name: String,
    start: f64,
    stretch: f64,
}

impl AudioItem {
    pub fn new<S: Into<String>>(name: S) -> AudioItem {
        AudioItem {
            name: name.into(),
            start: 0f64,
            stretch: 1f64,
        }
    }

    pub fn set_start(&mut self, start: f64) {
        self.start = start;
    }

    pub fn set_stretch(&mut self, stretch: f64) {
        self.stretch = stretch;
    }
}