use documented::Documented;
use gpui::{Hsla, point};

use crate::components::Label;
use crate::prelude::*;

/// A progress bar is a horizontal bar that communicates the status of a process.
///
/// A progress bar should not be used to represent indeterminate progress.
#[derive(IntoElement, RegisterComponent, Documented)]
pub struct ProgressBar {
    id: ElementId,
    value: f32,
    max_value: f32,
    bg_color: Hsla,
    over_color: Hsla,
    fg_color: Hsla,
}

impl ProgressBar {
    pub fn new(id: impl Into<ElementId>, value: f32, max_value: f32, cx: &App) -> Self {
        Self {
            id: id.into(),
            value,
            max_value,
            bg_color: cx.theme().colors().background,
            over_color: cx.theme().status().error,
            fg_color: cx.theme().status().info,
        }
    }

    /// Sets the current value of the progress bar.
    pub fn value(mut self, value: f32) -> Self {
        self.value = value;
        self
    }

    /// Sets the maximum value of the progress bar.
    pub fn max_value(mut self, max_value: f32) -> Self {
        self.max_value = max_value;
        self
    }

    /// Sets the background color of the progress bar.
    pub fn bg_color(mut self, color: Hsla) -> Self {
        self.bg_color = color;
        self
    }

    /// Sets the foreground color of the progress bar.
    pub fn fg_color(mut self, color: Hsla) -> Self {
        self.fg_color = color;
        self
    }

    /// Sets the over limit color of the progress bar.
    pub fn over_color(mut self, color: Hsla) -> Self {
        self.over_color = color;
        self
    }
}

impl RenderOnce for ProgressBar {
    fn render(self, _window: &mut Window, _cx: &mut App) -> impl IntoElement {
        let fill_width = (self.value / self.max_value).clamp(0.02, 1.0);

        div()
            .id(self.id.clone())
            .w_full()
            .h_2()
            .p_0p5()
            .rounded_full()
            .bg(self.bg_color)
            .shadow(vec![gpui::BoxShadow {
                color: gpui::black().opacity(0.08),
                offset: point(px(0.), px(1.)),
                blur_radius: px(0.),
                spread_radius: px(0.),
                inset: false,
            }])
            .child(
                div()
                    .h_full()
                    .rounded_full()
                    .when(self.value > self.max_value, |div| div.bg(self.over_color))
                    .when(self.value <= self.max_value, |div| div.bg(self.fg_color))
                    .w(relative(fill_width)),
            )
    }
}

impl Component for ProgressBar {
    fn scope() -> ComponentScope {
        ComponentScope::Status
    }

    fn description() -> Option<&'static str> {
        Some(Self::DOCS)
    }

    fn preview(_window: &mut Window, cx: &mut App) -> Option<AnyElement> {
        let max_value = 180.0;
        let container = || v_flex().w_full().gap_1();

        Some(
            example_group(vec![single_example(
                "Examples",
                v_flex()
                    .w_full()
                    .gap_2()
                    .child(
                        container()
                            .child(
                                h_flex()
                                    .justify_between()
                                    .child(Label::new("0%"))
                                    .child(Label::new("Empty")),
                            )
                            .child(ProgressBar::new("empty", 0.0, max_value, cx)),
                    )
                    .child(
                        container()
                            .child(
                                h_flex()
                                    .justify_between()
                                    .child(Label::new("38%"))
                                    .child(Label::new("Partial")),
                            )
                            .child(ProgressBar::new("partial", max_value * 0.35, max_value, cx)),
                    )
                    .child(
                        container()
                            .child(
                                h_flex()
                                    .justify_between()
                                    .child(Label::new("100%"))
                                    .child(Label::new("Complete")),
                            )
                            .child(ProgressBar::new("filled", max_value, max_value, cx)),
                    )
                    .into_any_element(),
            )])
            .into_any_element(),
        )
    }
}
