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use serde::{Deserialize, Serialize};

/// This object describes the position on faces where a mask should be placed by
/// default.
///
/// [The official docs](https://core.telegram.org/bots/api#maskposition).
#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct MaskPosition {
    /// The part of the face relative to which the mask should be placed. One
    /// of `forehead`, `eyes`, `mouth`, or `chin`.
    pub point: String,

    /// Shift by X-axis measured in widths of the mask scaled to the face size,
    /// from left to right. For example, choosing `-1.0` will place mask just
    /// to the left of the default mask position.
    pub x_shift: f64,

    /// Shift by Y-axis measured in heights of the mask scaled to the face
    /// size, from top to bottom. For example, `1.0` will place the mask just
    /// below the default mask position.
    pub y_shift: f64,

    /// Mask scaling coefficient. For example, `2.0` means double size.
    pub scale: f64,
}

impl MaskPosition {
    pub fn new<S>(point: S, x_shift: f64, y_shift: f64, scale: f64) -> Self
    where
        S: Into<String>,
    {
        Self {
            point: point.into(),
            x_shift,
            y_shift,
            scale,
        }
    }

    pub fn point<S>(mut self, val: S) -> Self
    where
        S: Into<String>,
    {
        self.point = val.into();
        self
    }

    pub fn x_shift(mut self, val: f64) -> Self {
        self.x_shift = val;
        self
    }

    pub fn y_shift(mut self, val: f64) -> Self {
        self.y_shift = val;
        self
    }

    pub fn scale(mut self, val: f64) -> Self {
        self.scale = val;
        self
    }
}