//! The only persistent host toolbar. A collapsed sidebar owns just its toggle
//! and the native traffic-light safe area; the page owns the rest of the window.
use crate::{
    display_list::{DisplayList, DrawCommand},
    geometry::{Point, Rect},
    system_ui::{
        Button, Interaction, Target, Ui,
        theme::{self, Theme},
    },
    tabs::Tab,
};

pub const WIDTH: f32 = 256.0;
pub const HEADER: f32 = 40.0;
pub const CONTROLS: f32 = if cfg!(target_os = "macos") { 86.0 } else { 0.0 };

#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum Action {
    Toggle,
    NewPage,
    Tool(&'static str),
    Activate(u64),
    Close(u64),
}

pub struct State {
    pub open: bool,
    pub interaction: Interaction,
    pub targets: Vec<Target<Action>>,
    pub scroll: f32,
}

impl Default for State {
    fn default() -> Self {
        Self {
            open: true,
            interaction: Interaction::default(),
            targets: Vec::new(),
            scroll: 0.0,
        }
    }
}

impl State {
    pub fn left(&self) -> f32 {
        if self.open { WIDTH } else { 0.0 }
    }

    pub fn covers(&self, point: Point) -> bool {
        if self.open {
            point.x >= 0.0 && point.x < WIDTH
        } else {
            Rect::new(0.0, 0.0, CONTROLS + 44.0, HEADER).contains(point)
        }
    }

    pub fn draw(
        &mut self,
        tabs: &[Tab],
        height: f32,
        accent: crate::display_list::Color,
    ) -> DisplayList {
        let mut ui = Ui::new(Theme::new(accent), self.interaction.clone());
        if self.open {
            ui.fill(Rect::new(0.0, 0.0, WIDTH, height), theme::BAR);
        }
        let toggle_x = if self.open {
            WIDTH - 40.0
        } else {
            CONTROLS + 4.0
        };
        // Draw a sidebar icon with primitives so its shape does not depend on fonts.
        ui.button(
            Rect::new(toggle_x, 6.0, 30.0, 28.0),
            Action::Toggle,
            Button::new(""),
        );
        ui.list.push(DrawCommand::StrokeRoundedRect {
            rect: Rect::new(toggle_x + 7.0, 13.0, 16.0, 13.0),
            radius: 2.0,
            width: 1.0,
            color: theme::MUTED,
        });
        ui.fill(Rect::new(toggle_x + 12.0, 14.0, 1.0, 11.0), theme::MUTED);
        if self.open {
            ui.label(20.0, 61.0, "ENDORPHIN", theme::TEXT, false);
            ui.button(
                Rect::new(12.0, 95.0, WIDTH - 24.0, 34.0),
                Action::NewPage,
                Button::new("＋  新建页面"),
            );
            for (index, (name, label)) in [
                ("Console", "Console"),
                ("Sources", "Sources"),
                ("Network", "Network"),
                ("Settings", "Settings"),
            ]
            .into_iter()
            .enumerate()
            {
                let selected = tabs
                    .iter()
                    .any(|tab| tab.active && tab.developer_tool.as_deref() == Some(name));
                ui.button(
                    Rect::new(12.0, 147.0 + index as f32 * 34.0, WIDTH - 24.0, 30.0),
                    Action::Tool(name),
                    Button::new(label).selected(selected),
                );
            }
            ui.label(20.0, 303.0, "页面", theme::MUTED, false);
            let area = Rect::new(8.0, 333.0, WIDTH - 16.0, (height - 383.0).max(0.0));
            let pages: Vec<_> = tabs
                .iter()
                .filter(|tab| tab.developer_tool.is_none())
                .collect();
            self.scroll = self
                .scroll
                .clamp(0.0, (pages.len() as f32 * 36.0 - area.height).max(0.0));
            ui.list.push(DrawCommand::PushClip(area));
            for (index, tab) in pages.into_iter().enumerate() {
                let y = area.y + index as f32 * 36.0 - self.scroll;
                // Register only fully visible rows: paint clipping must match input.
                if y < area.y || y + 32.0 > area.y + area.height {
                    continue;
                }
                ui.button(
                    Rect::new(12.0, y, WIDTH - 56.0, 32.0),
                    Action::Activate(tab.id),
                    Button::new(&tab.title).selected(tab.active),
                );
                ui.button(
                    Rect::new(WIDTH - 40.0, y, 28.0, 32.0),
                    Action::Close(tab.id),
                    Button::new("×"),
                );
            }
            ui.list.push(DrawCommand::PopClip);
            ui.label(20.0, height - 32.0, "本地工作区", theme::MUTED, false);
        }
        self.targets = ui.targets;
        self.interaction.reconcile(&self.targets);
        ui.list
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn collapsing_removes_every_host_target_except_the_toggle() {
        let mut sidebar = State::default();
        sidebar.draw(&[], 800.0, theme::PALETTE[0]);
        assert!(sidebar.targets.len() > 1);
        sidebar.open = false;
        sidebar.draw(&[], 800.0, theme::PALETTE[0]);
        assert_eq!(sidebar.targets.len(), 1);
        assert_eq!(sidebar.targets[0].action, Some(Action::Toggle));
        assert_eq!(sidebar.left(), 0.0);
        assert!(!sidebar.covers(Point::new(400.0, 10.0)));
        assert!(!sidebar.covers(Point::new(10.0, 80.0)));
    }
}