pragma Singleton
pragma ComponentBehavior: Bound

import QtQuick
import Quickshell
import qs.Services
import "LayoutResolver.js" as Resolver

Singleton {
    id: root

    readonly property var screens: Quickshell.screens.map(screen => ({
                name: screen.name,
                model: screen.model,
                x: screen.x,
                y: screen.y,
                width: screen.width,
                height: screen.height,
                scale: CompositorService.getScreenScale(screen)
            }))
    readonly property var primaryBar: SettingsData.getPrimaryBarConfig()
    readonly property var layouts: screens.map(screen => Resolver.resolveScreen(SettingsData.barConfigs.map(config => ({
                    config,
                    barThickness: Theme.barThickness(config.innerPadding ?? 4, screen.scale),
                    wingSize: config.gothCornersEnabled && root.barSpansEdge(config) ? Math.max(0, config.gothCornerRadiusOverride ? config.gothCornerRadiusValue ?? 12 : Theme.windowRadius) : 0,
                    popupThickness: Theme.barThickness(Resolver.option(config, "innerPadding", root.primaryBar, 4), screen.scale),
                    islandThickness: Resolver.islandThickness(config, SettingsData.islandDefaults),
                    islandFloating: SettingsData.islandSetting(config, "islandFloating")
                })), screen, {
            screens: root.screens,
            displayNameMode: SettingsData.displayNameMode,
            framePreferences: SettingsData.frameScreenPreferences,
            effectiveFrameEnabled: FrameTransitionState.effectiveFrameEnabled,
            effectiveConnected: FrameTransitionState.effectiveConnectedFrameModeActive,
            frameThickness: SettingsData.frameThickness,
            frameBarSize: SettingsData.frameBarSize
        }))
    readonly property var islandKeys: layouts.reduce((keys, layout) => keys.concat(layout.instances.filter(instance => instance.kind === "island").map(instance => instance.key)), [])

    function barSpansEdge(config) {
        return (config?.barLengthMode ?? "full") === "full" && (config?.barLengthPadding ?? 0) <= 0;
    }

    function forScreen(screen) {
        const name = typeof screen === "string" ? screen : screen?.name;
        return layouts.find(layout => layout.screen.name === name) ?? null;
    }

    function screenForName(name) {
        return Quickshell.screens.find(screen => screen.name === name) ?? null;
    }

    function instance(key) {
        const [screenName, barId] = JSON.parse(key);
        return forScreen(screenName)?.instances.find(instance => instance.barId === barId) ?? null;
    }

    function forConfig(screen, barId) {
        return forScreen(screen)?.instances.find(instance => instance.barId === barId) ?? null;
    }

    function edge(screen, side) {
        return forScreen(screen)?.edges[side] ?? null;
    }

    function assignedScreens(config) {
        return Quickshell.screens.filter(screen => coversScreen(config, screen));
    }

    function coversScreen(config, screen) {
        return Resolver.coversScreen(config, screen, screens, SettingsData.displayNameMode);
    }

    function standaloneScreens(barId) {
        return Quickshell.screens.filter(screen => forScreen(screen)?.instances.some(instance => instance.barId === barId && instance.kind === "bar"));
    }

    function hostedScreens(barId) {
        return Quickshell.screens.filter(screen => forScreen(screen)?.instances.some(instance => instance.barId === barId && (instance.kind === "bar" || instance.kind === "island")));
    }

    function frameKeys(screen) {
        const instances = forScreen(screen)?.instances ?? [];
        const order = ["left", "right", "top", "bottom"];
        return instances.filter(instance => instance.kind === "frame").sort((a, b) => order.indexOf(a.edge) - order.indexOf(b.edge)).map(instance => instance.key);
    }

    function barEdges(screen, overlayOnly) {
        return Resolver.edges.filter(side => edge(screen, side)?.bars.some(config => !overlayOnly || config.useOverlayLayer));
    }

    function islandConfigs(screen) {
        return forScreen(screen)?.islands.map(input => input.config) ?? [];
    }

    function frameReservation(screen, side) {
        return edge(screen, side)?.frameReservation ?? 0;
    }

    function frameContentInset(screen, barId, side) {
        const layout = forScreen(screen);
        const band = layout?.edges[side];
        if (!band?.occupancy)
            return null;
        const instance = forConfig(screen, barId);
        return Math.max(0, band.occupancy - (instance?.kind === "frame" ? 0 : instance?.margins[side] ?? 0));
    }

    function adjacentBar(screen, side, config) {
        return Resolver.adjacentBar(forScreen(screen), side, config);
    }

    function dockAdjacentThickness(screen, side) {
        const layout = forScreen(screen);
        return (layout?.instances ?? []).filter(instance => instance.edge === side).reduce((sum, instance) => sum + instance.reservation, 0);
    }

    function adjacentInfo(screen, config) {
        return Resolver.adjacentInfo(forScreen(screen), config, primaryBar);
    }

    function barBounds(screen, thickness, position, config) {
        const appearance = config ?? primaryBar;
        const radius = (appearance?.gothCornerRadiusOverride ?? false) ? (appearance?.gothCornerRadiusValue ?? 12) : Theme.windowRadius;
        const wing = (appearance?.gothCornersEnabled ?? false) && barSpansEdge(appearance) ? Math.max(0, radius) : 0;
        const edge = position === undefined ? (primaryBar?.position ?? 0) : position;
        return Resolver.barBounds(forScreen(screen), thickness, edge, config, primaryBar, SettingsData.connectedFrameModeActive, wing);
    }

    function surfaceOrigin(screen, width, height, anchors, margins) {
        return Resolver.surfaceOrigin(forScreen(screen) ?? {
            screen
        }, width, height, anchors, margins);
    }

    function popupTrigger(pos, screen, thickness, width, spacing, position, config) {
        const edge = position === undefined ? (primaryBar?.position ?? 0) : position;
        const gap = spacing === undefined ? (primaryBar?.spacing ?? 4) : spacing;
        const trigger = Resolver.popupTrigger(pos, screen, thickness, width, gap, edge, config, primaryBar, SettingsData.connectedFrameModeActive);
        const offset = forScreen(screen)?.instances.find(instance => instance.barId === config?.id)?.rowOffset ?? 0;
        switch (edge) {
        case 0:
            trigger.y += offset;
            break;
        case 1:
            trigger.y -= offset;
            break;
        case 2:
            trigger.x += offset;
            break;
        case 3:
            trigger.x -= offset;
            break;
        }
        return trigger;
    }

    function positionChoices(config) {
        return Resolver.availablePositions(layouts.filter(layout => coversScreen(config, layout.screen)), config);
    }
}