import { Palette } from "theme.slint";
import { TimeString, Const } from "global.slint";

export struct TimelineEvent {
    start: int,
    duration: int,
    finished: bool,
    label: string,
    background-color: color,
    text-color: color,
}

export struct TimelineState {
    visible-time: int,
    offset: int,
    events: [TimelineEvent],
}

export component Timeline inherits Rectangle {
    callback clicked <=> ta.clicked;

    background: Palette.background;
    
    in-out property<TimelineState> state;
    property<int> visible-offset: max(state.offset, state.visible-time);
    out property<int> max-offset: Const.max-offset;

    ta := TouchArea {
        preferred-width: 100%;
        preferred-height: 100%;
    }

    border-width: 1px;
    border-color: black;
    Rectangle {
        x: 0;
        y: parent.height / 4;
        z: 0;
        width: parent.width;
        height: parent.height / 2;
        border-color: black;
        border-width: 1px;
        background: Palette.timeline;
    }

    Text {
        x: 0;
        y: parent.height - self.height;
        text: TimeString.from(visible-offset - state.visible-time);
        color: Palette.background-text;
    }

    Text {
        x: parent.width - self.width;
        y: parent.height - self.height;
        text: TimeString.from(visible-offset);
        color: Palette.background-text;
    }

    for event in state.events: timeline-event := Rectangle {
        property<length> real-x: ((state.visible-time - (visible-offset - event.start)) / state.visible-time) * parent.width;
        property<length> real-width: event.duration / state.visible-time * parent.width + min(real-x, 0);
        x: max(real-x, 0);
        y: parent.height / 4;
        z: 1;
        width: event.finished ?
            min(parent.width - self.x, real-width) :
            parent.width - self.x;
        height: parent.height / 2;
        visible: self.width > 0 && self.real-x < parent.width;
        border-color: black;
        border-width: 1px;
        background: event.background-color;

        Text {
            x: 0;
            y: -self.height;
            text: event.label;
            visible: timeline-event.visible;
            color: Palette.background-text;
        }
        start-txt := Text {
            x: 0;
            y: root.height - self.height - timeline-event.height;
            text: timeline-event.x == timeline-event.real-x ?
                TimeString.from(event.start) :
                TimeString.from(visible-offset - state.visible-time);
            visible: timeline-event.visible &&
                (self.width * 2 < timeline-event.width ||
                    (!end-txt.visible && self.width < timeline-event.width));
            color: event.text-color;
        }
        end-txt := Text {
            x: timeline-event.width - self.width;
            y: root.height - self.height - timeline-event.height;
            text: timeline-event.x + timeline-event.real-width <= root.width ?
                TimeString.from(event.start + event.duration) :
                TimeString.from(visible-offset);
            visible: timeline-event.visible && timeline-event.width - self.width * 2 > 0;
            color: event.text-color;
        }
    }
    @children
}