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/* source: https://github.com/jamwaffles/embedded-graphics/blob/master/simulator/src/output_settings.rs */

/// Output settings.
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct OutputSettings {
    /// Pixel scale.
    pub scale: u32,
    /// Spacing between pixels.
    pub pixel_spacing: u32,
}

impl Default for OutputSettings {
    fn default() -> Self {
        OutputSettingsBuilder::new().build()
    }
}

/// Output settings builder.
pub struct OutputSettingsBuilder {
    scale: Option<u32>,
    pixel_spacing: Option<u32>,
}

impl OutputSettingsBuilder {
    /// Creates new output settings builder.
    pub fn new() -> Self {
        Self {
            scale: None,
            pixel_spacing: None,
        }
    }

    /// Sets the pixel scale.
    ///
    /// A scale of `2` or higher is useful for viewing the simulator on high DPI displays.
    ///
    /// # Panics
    ///
    /// Panics if the scale is set to `0`.
    pub fn scale(mut self, scale: u32) -> Self {
        if scale == 0 {
            panic!("scale must be >= 0");
        }

        self.scale = Some(scale);

        self
    }

    /// Sets the gap between pixels.
    ///
    /// Most lower resolution displays have visible gaps between individual pixels.
    /// This effect can be simulated by setting the pixel spacing to a value greater
    /// than `0`.
    pub fn pixel_spacing(mut self, pixel_spacing: u32) -> Self {
        self.pixel_spacing = Some(pixel_spacing);

        self
    }

    /// Builds the output settings.
    pub fn build(self) -> OutputSettings {
        OutputSettings {
            scale: self.scale.unwrap_or(1),
            pixel_spacing: self.pixel_spacing.unwrap_or(0),
        }
    }
}