//! Types for generating widget embed URLs.

use crate::{
    endpoints,
    error::{InvalidUrl, Result},
};
use snafu::ResultExt;
use std::collections::HashMap;
use url::Url;

#[derive(Clone, Debug)]
struct Widget(u64, HashMap<&'static str, String>, bool);

impl Widget {
    fn build(self) -> Result<String> {
        let widget_uri = if self.2 {
            endpoints::png_widget(self.0)
        } else {
            endpoints::widget(self.0)
        };

        let params = self.1.into_iter().map(|(k, v)| (k, v)).collect::<Vec<_>>();

        let url = Url::parse_with_params(&widget_uri, params)
            .with_context(|| InvalidUrl { uri: widget_uri })?;

        Ok(url.into_string())
    }

    fn insert(&mut self, k: &'static str, v: impl Into<String>) -> &mut Self {
        self._insert(k, v.into())
    }

    fn _insert(&mut self, k: &'static str, v: String) -> &mut Self {
        self.1.insert(k, v);

        self
    }
}

/// Type-safe and guarenteed method of making a large widget.
#[derive(Clone, Debug)]
pub struct LargeWidget(Widget);

impl LargeWidget {
    /// Creates a new builder for making a large widget.
    pub fn new(bot_id: u64) -> Self {
        Self(Widget(bot_id, HashMap::new(), false))
    }

    /// Builds into a valid URL.
    ///
    /// # Errors
    ///
    /// Returns [`Error::InvalidUrl`] if one of the query parameters is invalid.
    ///
    /// [`Error::InvalidUrl`]: ../enum.Error.html#variant.InvalidUrl
    pub fn build(self) -> Result<String> {
        self.0.build()
    }

    /// Sets the top color of the widget.
    pub fn top_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("topcolor", value);

        self
    }

    /// Sets the middle color of the widget.
    pub fn middle_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("middlecolor", value);

        self
    }

    /// Sets the username color of the widget.
    pub fn username_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("usernamecolor", value);

        self
    }

    /// Sets the certified color of the widget.
    pub fn certified_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("certifiedcolor", value);

        self
    }

    /// Sets the data color of the widget.
    pub fn data_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("datacolor", value);

        self
    }

    /// Sets the label color of the widget.
    pub fn label_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("labelcolor", value);

        self
    }

    /// Sets if the widget should be a png instead of a svg.
    pub fn png(&mut self, value: bool) -> &mut Self {
        (self.0).2 = value;

        self
    }
}

/// Type-safe and guarenteed method of making a small widget.
#[derive(Clone, Debug)]
pub struct SmallWidget(Widget);

impl SmallWidget {
    /// Creates a new builder for making a small widget.
    pub fn new(bot_id: u64) -> Self {
        Self(Widget(bot_id, HashMap::new(), false))
    }

    /// Builds into a valid URL.
    ///
    /// # Errors
    ///
    /// Returns [`Error::InvalidUrl`] if one of the query parameters is invalid.
    ///
    /// [`Error::InvalidUrl`]: ../enum.Error.html#variant.InvalidUrl
    pub fn build(self) -> Result<String> {
        self.0.build()
    }

    /// Sets the background color of the widget.
    pub fn avatar_background(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("avatarbg", value);

        self
    }

    /// Sets the left color of the widget.
    pub fn left_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("leftcolor", value);

        self
    }

    /// Sets the left text color of the widget.
    pub fn left_text_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("lefttextcolor", value);

        self
    }

    /// Sets the right color of the widget.
    pub fn right_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("rightcolor", value);

        self
    }

    /// Sets the right text color of the widget.
    pub fn right_text_color(&mut self, value: impl Into<String>) -> &mut Self {
        self.0.insert("righttextcolor", value);

        self
    }

    /// Sets if the widget should be a png instead of a svg.
    pub fn png(&mut self, value: bool) -> &mut Self {
        (self.0).2 = value;

        self
    }
}

#[cfg(test)]
mod tests {
    use super::{LargeWidget, SmallWidget};
    use crate::Result;

    // The ordering of `url`'s parsed query parameters isn't always
    // reproducable.
    #[test]
    fn test_small_widget() -> Result<()> {
        let mut widget = SmallWidget::new(1);
        widget
            .avatar_background("00FF00")
            .left_color("FF0000")
            .left_text_color("FFFFFF")
            .right_color("0F0F0F")
            .right_text_color("F0F0F0")
            .png(true);

        let url = widget.build()?;
        assert!(url.contains("avatarbg=00FF00"));
        assert!(url.contains("lefttextcolor=FFFFFF"));
        assert!(url.contains("leftcolor=FF0000"));
        assert!(url.contains("rightcolor=0F0F0F"));
        assert!(url.contains("righttextcolor=F0F0F0"));
        assert!(url.starts_with("https://top.gg/api/widget/1.png?"));

        Ok(())
    }

    #[test]
    fn test_large_widget() -> Result<()> {
        let mut widget = LargeWidget::new(1);
        widget
            .certified_color("FF0000")
            .data_color("00FF00")
            .label_color("0000FF")
            .middle_color("FFF000")
            .top_color("000FFF")
            .username_color("AAAAAA");

        let url = widget.build()?;
        assert!(url.contains("certifiedcolor=FF0000"));
        assert!(url.contains("datacolor=00FF00"));
        assert!(url.contains("labelcolor=0000FF"));
        assert!(url.contains("middlecolor=FFF000"));
        assert!(url.contains("topcolor=000FFF"));
        assert!(url.contains("usernamecolor=AAAAAA"));
        assert!(url.starts_with("https://top.gg/api/widget/1.svg?"));

        Ok(())
    }
}