import MilestoneComponent from "@/components/features/Milestone.vue";
import {
    CoercableComponent,
    Component,
    findFeatures,
    getUniqueID,
    makePersistent,
    Persistent,
    Replace,
    setDefault,
    StyleValue,
    Visibility
} from "@/features/feature";
import { globalBus } from "@/game/events";
import "@/game/notifications";
import settings from "@/game/settings";
import {
    Computable,
    GetComputableType,
    GetComputableTypeWithDefault,
    processComputable,
    ProcessedComputable
} from "@/util/computed";
import { createProxy } from "@/util/proxies";
import { coerceComponent, isCoercableComponent } from "@/util/vue";
import { Unsubscribe } from "nanoevents";
import { computed, Ref, unref } from "vue";
import { useToast } from "vue-toastification";

export const MilestoneType = Symbol("Milestone");

export enum MilestoneDisplay {
    All = "all",
    //Last = "last",
    Configurable = "configurable",
    Incomplete = "incomplete",
    None = "none"
}

export interface MilestoneOptions {
    visibility?: Computable<Visibility>;
    shouldEarn: Computable<boolean>;
    style?: Computable<StyleValue>;
    classes?: Computable<Record<string, boolean>>;
    display?: Computable<
        | CoercableComponent
        | {
              requirement: CoercableComponent;
              effectDisplay?: CoercableComponent;
              optionsDisplay?: CoercableComponent;
          }
    >;
    onComplete?: VoidFunction;
}

interface BaseMilestone extends Persistent<boolean> {
    id: string;
    earned: Ref<boolean>;
    type: typeof MilestoneType;
    [Component]: typeof MilestoneComponent;
}

export type Milestone<T extends MilestoneOptions> = Replace<
    T & BaseMilestone,
    {
        visibility: GetComputableTypeWithDefault<T["visibility"], Visibility.Visible>;
        shouldEarn: GetComputableType<T["shouldEarn"]>;
        style: GetComputableType<T["style"]>;
        classes: GetComputableType<T["classes"]>;
        display: GetComputableType<T["display"]>;
    }
>;

export type GenericMilestone = Replace<
    Milestone<MilestoneOptions>,
    {
        visibility: ProcessedComputable<Visibility>;
    }
>;

export function createMilestone<T extends MilestoneOptions>(
    options: T & ThisType<Milestone<T>>
): Milestone<T> {
    const milestone: T & Partial<BaseMilestone> = options;
    makePersistent<boolean>(milestone, false);
    milestone.id = getUniqueID("milestone-");
    milestone.type = MilestoneType;
    milestone[Component] = MilestoneComponent;

    milestone.earned = milestone.state;
    processComputable(milestone as T, "visibility");
    setDefault(milestone, "visibility", Visibility.Visible);
    const visibility = milestone.visibility as ProcessedComputable<Visibility>;
    milestone.visibility = computed(() => {
        switch (settings.msDisplay) {
            default:
            case MilestoneDisplay.All:
                return unref(visibility);
            case MilestoneDisplay.Configurable:
                if (
                    unref(proxy.earned) &&
                    !(
                        proxy.display != null &&
                        typeof unref(proxy.display) == "object" &&
                        "optionsDisplay" in (unref(proxy.display) as Record<string, unknown>)
                    )
                ) {
                    return Visibility.None;
                }
                return unref(visibility);
            case MilestoneDisplay.Incomplete:
                if (unref(proxy.earned)) {
                    return Visibility.None;
                }
                return unref(visibility);
            case MilestoneDisplay.None:
                return Visibility.None;
        }
    });

    processComputable(milestone as T, "shouldEarn");
    processComputable(milestone as T, "style");
    processComputable(milestone as T, "classes");
    processComputable(milestone as T, "display");

    const proxy = createProxy((milestone as unknown) as Milestone<T>);
    return proxy;
}

const toast = useToast();

const listeners: Record<string, Unsubscribe> = {};
globalBus.on("addLayer", layer => {
    const milestones: GenericMilestone[] = (findFeatures(
        layer,
        MilestoneType
    ) as GenericMilestone[]).filter(milestone => milestone.shouldEarn != null);
    listeners[layer.id] = layer.on("postUpdate", () => {
        milestones.forEach(milestone => {
            if (
                unref(milestone.visibility) === Visibility.Visible &&
                !milestone.earned.value &&
                unref(milestone.shouldEarn)
            ) {
                milestone.state.value = true;
                milestone.onComplete?.();
                if (milestone.display) {
                    const display = unref(milestone.display);
                    toast.info(
                        <template>
                            <h2>Milestone earned!</h2>
                            <div>
                                {coerceComponent(
                                    isCoercableComponent(display) ? display : display.requirement
                                )}
                            </div>
                        </template>
                    );
                }
            }
        });
    });
});
globalBus.on("removeLayer", layer => {
    // unsubscribe from postUpdate
    listeners[layer.id]?.();
    delete listeners[layer.id];
});

declare module "@/game/settings" {
    interface Settings {
        msDisplay: MilestoneDisplay;
    }
}

globalBus.on("loadSettings", settings => {
    setDefault(settings, "msDisplay", MilestoneDisplay.All);
});