Overlay

import { mount, Overlay, signal, Text, View, type ViewRef } from "nsh";
import { button, buttonText, desktop, Inspector, Panel, Segmented, Stage, ui, wide } from "./palette";

type Placement = "top" | "bottom" | "left" | "right";
type Align = "start" | "center" | "end";

function App() {
  const open = signal(false);
  const placement = signal<Placement>("bottom");
  const align = signal<Align>("center");
  const position = signal("—");
  const closed = signal("—");
  let anchor: ViewRef | undefined;

  const placements = () => (
    <Segmented
      label="placement"
      options={["top", "bottom", "left", "right"] as Placement[]}
      value={placement()}
      onChange={(v) => (placement.set(v), open.set(true))}
    />
  );
  const aligns = () => (
    <Segmented label="align" options={["start", "center", "end"] as Align[]} value={align()} onChange={(v) => (align.set(v), open.set(true))} />
  );
  const subject = () => (
    <>
      <View
        style={{
          width: 220,
          height: 72,
          overflow: "hidden",
          borderRadius: 14,
          borderWidth: 2,
          borderStyle: "dashed",
          borderColor: ui().faint,
          alignItems: "center",
          justifyContent: "center",
        }}
      >
        <View
          ref={anchor}
          onPress={() => open.set(!open())}
          {...button("accent", { align: "center" })}
        >
          <Text style={buttonText("accent")}>{open() ? "Close" : "Open"}</Text>
        </View>
        <If when={open()}>
          <Overlay
            anchor={anchor}
            placement={placement()}
            align={align()}
            offset={8}
            margin={12}
            onPosition={(e) =>
              position.set(
                `${e.placement} at ${Math.round(e.bounds.origin.x)}, ${Math.round(e.bounds.origin.y)} · ${Math.round(e.bounds.size.width)}×${Math.round(e.bounds.size.height)} · room ${Math.round(e.available.width)}×${Math.round(e.available.height)}`,
              )
            }
            onPressOutside={(e) => {
              closed.set(`onPressOutside at ${Math.round(e.pagePosition.x)}, ${Math.round(e.pagePosition.y)}`);
              open.set(false);
            }}
            onCancel={() => {
              closed.set("onCancel");
              open.set(false);
            }}
            style={{
              ...ui().card,
              borderRadius: 12,
              padding: 14,
              gap: 4,
              // Narrow beside the button, so it fits on a phone's side.
              maxWidth: !wide() && (placement() === "left" || placement() === "right") ? 130 : 220,
            }}
          >
            <Text style={{ fontSize: 15, fontWeight: "600", color: ui().text }}>On top of everything</Text>
            <Text style={{ fontSize: 13, color: ui().muted }}>
              Its box clips the button, not this overlay. Pick a side {wide() ? "on the right" : "above"}.
            </Text>
          </Overlay>
        </If>
      </View>
      <Text style={{ marginTop: 6, fontSize: 12, color: ui().faint }}>The dashed box has overflow: hidden</Text>
    </>
  );

  return (
    <View style={{ flex: 1, backgroundColor: ui().page, padding: 20, paddingTop: 24, gap: 14 }}>
      <Text style={{ fontSize: 22, fontWeight: "700", color: ui().text }}>overlay</Text>
      <Text style={{ color: ui().muted }}>
        {desktop ? "Click the button, then click outside or press Escape" : "Tap the button, then tap outside"}
      </Text>

      {() =>
        wide() ? (
          <View style={{ flex: 1, flexDirection: "row", gap: 16 }}>
            <Stage>
              <View style={{ alignItems: "center" }}>{subject()}</View>
            </Stage>
            <Inspector>
              {placements()}
              {aligns()}
              <Panel title="onPosition">
                <Text style={{ fontSize: 13, color: ui().text, fontVariant: ["tabular-nums"] }}>{position()}</Text>
              </Panel>
              <Panel title="closed by" grow>
                <Text style={{ fontSize: 13, color: closed() === "—" ? ui().text : ui().accent }}>{closed()}</Text>
              </Panel>
            </Inspector>
          </View>
        ) : (
          <>
            <View style={{ flexDirection: "row", gap: 12 }}>
              <View style={{ flex: 3 }}>{placements()}</View>
              <View style={{ flex: 2 }}>{aligns()}</View>
            </View>

            <View style={{ flex: 1, minHeight: 160, alignItems: "center", justifyContent: "center" }}>{subject()}</View>

            <View style={{ ...ui().inset, borderRadius: 12, padding: 12, gap: 6 }}>
              <Text style={{ fontSize: 12, color: ui().muted }}>
                onPosition <Text style={{ color: ui().text }}>{position()}</Text>
              </Text>
              <Text style={{ fontSize: 12, color: ui().muted }}>
                closed by <Text style={{ color: closed() === "—" ? ui().text : ui().accent }}>{closed()}</Text>
              </Text>
            </View>
          </>
        )
      }
    </View>
  );
}

mount(App);