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use super::behaviors::MouseBehavior;

use crate::{api::prelude::*, prelude::*, proc_macros::*};

// --- KEYS --
static ID_SWITCH_TRACK: &str = "switch_track";
static ID_SWITCH_TOGGLE: &str = "switch_toggle";
// --- KEYS --

/// State to handle the position of switch toggle.
#[derive(Default, AsAny)]
pub struct SwitchState {
    selected: bool,
    switch_toggle: Entity,
}

impl SwitchState {
    fn toggle_selection(&mut self) {
        self.selected = !self.selected;
    }
}

impl State for SwitchState {
    fn init(&mut self, _: &mut Registry, ctx: &mut Context) {
        self.switch_toggle = ctx
            .entity_of_child(ID_SWITCH_TOGGLE)
            .expect("SwitchState.init: Switch toggle child could not be found.");
    }

    fn update(&mut self, _: &mut Registry, ctx: &mut Context) {
        if *ctx.widget().get::<bool>("selected") == self.selected {
            return;
        }

        switch(ctx.widget()).set_selected(self.selected);

        let element = ctx.widget().clone::<Selector>("selector").style.unwrap();

        if let Some(parent) = ctx.parent_entity_by_style(&*element) {
            ctx.get_widget(parent).update(false);
        }

        {
            let mut switch_toggle = ctx.get_widget(self.switch_toggle);

            if self.selected {
                switch_toggle.set("h_align", Alignment::from("end"));
                switch_toggle
                    .get_mut::<Selector>("selector")
                    .set_state("selected");
            } else {
                switch_toggle.set("h_align", Alignment::from("start"));
                switch_toggle.get_mut::<Selector>("selector").clear_state();
            }

            switch_toggle.update(true);
        }

        ctx.get_widget(self.switch_toggle).update(false);
    }
}

widget!(
    /// The `Switch` widget can be switch between `on` and `off`.
    ///
    /// **style:** `switch`
    Switch<SwitchState>: MouseHandler {
        /// Sets or shares the background property.
        background: Brush,

        /// Sets or shares the border radius property.
        border_radius: f64,

        /// Sets or shares the border thickness property.
        border_width: Thickness,

        /// Sets or shares the border brush property.
        border_brush: Brush,

        /// Sets or shares the padding property.
        padding: Thickness,

        /// Sets or shares the pressed property.
        pressed: bool,

        /// Sets or shares the selected property.
        selected: bool
    }
);

impl Template for Switch {
    fn template(self, id: Entity, ctx: &mut BuildContext) -> Self {
        self.name("Switch")
            .style("switch")
            .pressed(false)
            .selected(false)
            .width(36.0)
            .height(30.0)
            .border_radius(8.0)
            .border_width(1.0)
            .padding(4.0)
            .on_changed_filter(vec!["selected"])
            .child(
                MouseBehavior::new()
                    .pressed(id)
                    .enabled(id)
                    .target(id.0)
                    .on_click(move |states, _| {
                        states.get_mut::<SwitchState>(id).toggle_selection();
                        false
                    })
                    .child(
                        Grid::new()
                            .child(
                                Container::new()
                                    .style(ID_SWITCH_TRACK)
                                    .margin((2, 0))
                                    .v_align("center")
                                    .build(ctx),
                            )
                            .child(
                                Container::new()
                                    .id(ID_SWITCH_TOGGLE)
                                    .style("switch_toggle")
                                    .v_align("center")
                                    .h_align("start")
                                    .width(20.0)
                                    .height(20.0)
                                    .border_radius(10.0)
                                    .build(ctx),
                            )
                            .build(ctx),
                    )
                    .build(ctx),
            )
    }
}