import {Affinity, AffinityDisplay} from "./Messages";

export enum MeteredResource {
    Experience = "EXP",
    Health = "HP",
    Magic = "MP",
    Items = "IP",
    Zero = "Zero Charge",
    Blood = "BP",
    Turns = "Turns",
    Segments = "Segments",
}

export function isMeteredResource(r: Resource): r is MeteredResource {
    return Object.values<Resource>(MeteredResource).includes(r)
}

export enum UnmeteredResource {
    Fabula = "FP",
    Ultima = "UP",
    Special = "SP",
    Level = "Levels",
    Materials = "Zenit of Materials",
    Zenit = "Zenit",
    Order = "Order",
}

export function formatResourceDelta(r: Resource, a: Affinity, n: number): string {
    const delta = `${n > 0 ? "+" : n === 0 ? "±" : ""}${n.toFixed(0)}${AffinityDisplay[a]}`
    if (Math.abs(n) === 1) {
        switch (r) {
            case MeteredResource.Turns:
                return `${delta} Turn`
            case MeteredResource.Segments:
                return `${delta} Segment`
            case UnmeteredResource.Level:
                return `${delta} Level`
        }
    }
    return `${delta} ${r}`
}

export function formatMeteredResource(r: MeteredResource, n: number, mx: number): string {
    const value = `${n}/${mx}`
    if (n === 1 && mx === 1) {
        switch (r) {
            case MeteredResource.Turns:
                return `${value} Turn`
            case MeteredResource.Segments:
                return `${value} Segment`
        }
    }
    return `${value} ${r}`
}

export function formatResourceValue(r: Resource, n: number): string {
    const value = `${n}`
    if (r === UnmeteredResource.Level) {
        return `Lv. ${value}`
    }
    if (n === 1) {
        switch (r) {
            case MeteredResource.Turns:
                return `${value} Turn`
            case MeteredResource.Segments:
                return `${value} Segment`
        }
    }
    return `${value} ${r}`
}

export function formatResourceMax(r: MeteredResource, n: number): string {
    const value = `${n}`
    if (n === 1) {
        switch (r) {
            case MeteredResource.Turns:
                return `Max ${value} Turn`
            case MeteredResource.Segments:
                return `Max ${value} Segment`
        }
    }
    return `Max ${value} ${r}`
}

export function isUnmeteredResource(r: Resource): r is UnmeteredResource {
    return Object.values<Resource>(UnmeteredResource).includes(r)
}

export type Resource = MeteredResource|UnmeteredResource

export function getResourceValue<
    KeySetT extends string|number|symbol, ObjectT extends {[key in KeySetT]?: number},
    ResourceT extends string|number|symbol>
(valueMap: {[key in ResourceT]: KeySetT|undefined}, object: ObjectT, resource: ResourceT): number|undefined {
    const field = valueMap[resource]
    if (typeof field === "undefined") {
        return undefined
    }
    return object[field]
}

export function setResourceValue<
    KeySetT extends string|number|symbol, ObjectT extends {[key in KeySetT]?: number},
    ResourceT extends string|number|symbol>
(valueMap: {[key in ResourceT]: KeySetT|undefined}, maxMap: {[key in ResourceT]: KeySetT|undefined}, object: ObjectT, resource: ResourceT, value: number): ObjectT {
    const valueField = valueMap[resource]
    const maxField = maxMap[resource]

    if (typeof valueField === "undefined") {
        return object
    }

    if (typeof maxField !== "undefined") {
        const max = getResourceValue(maxMap, object, resource)
        if (typeof max === "undefined") {
            return object
        }
        return setMeteredResource(valueMap, maxMap, object, resource, value, max)
    }

    const effectiveValue = Math.max(0, value)
    return {
        ...object,
        [valueField as KeySetT]: effectiveValue,
    }
}
export function applyResourceDelta<
    KeySetT extends string|number|symbol, ObjectT extends {[key in KeySetT]?: number},
    ResourceT extends string|number|symbol>
(valueMap: {[key in ResourceT]: KeySetT|undefined}, maxMap: {[key in ResourceT]: KeySetT|undefined}, object: ObjectT, resource: ResourceT, delta: number): ObjectT {
    const value = getResourceValue(valueMap, object, resource)
    if (typeof value === "undefined") {
        return object
    }

    return setResourceValue(valueMap, maxMap, object, resource, value + delta)
}

export function setResourceMax<
    KeySetT extends string|number|symbol, ObjectT extends {[key in KeySetT]?: number},
    ResourceT extends string|number|symbol>
(valueMap: {[key in ResourceT]: KeySetT|undefined}, maxMap: {[key in ResourceT]: KeySetT|undefined}, object: ObjectT, resource: ResourceT, max: number): ObjectT {
    const valueField = valueMap[resource]
    const maxField = maxMap[resource]

    if (typeof valueField === "undefined" || typeof maxField === "undefined") {
        return object
    }
    const value = getResourceValue(valueMap, object, resource)
    if (typeof value === "undefined") {
        return object
    }
    return setMeteredResource(valueMap, maxMap, object, resource, value, max)
}

export function setMeteredResource<
    KeySetT extends string|number|symbol, ObjectT extends {[key in KeySetT]?: number},
    ResourceT extends string|number|symbol>
(valueMap: {[key in ResourceT]: KeySetT|undefined}, maxMap: {[key in ResourceT]: KeySetT|undefined}, object: ObjectT, resource: ResourceT, value: number, max: number): ObjectT {
    const valueField = valueMap[resource]
    const maxField = maxMap[resource]

    if (typeof valueField === "undefined" || typeof maxField === "undefined") {
        return object
    }
    const effectiveMax = Math.max(0, max)
    const effectiveValue = Math.max(0, Math.min(value, effectiveMax))
    return {
        ...object,
        [valueField as KeySetT]: effectiveValue,
        [maxField as KeySetT]: effectiveMax,
    }
}

export function clearResource<
    KeySetT extends string|number|symbol, ObjectT extends {[key in KeySetT]?: number},
    ResourceT extends string|number|symbol>
(valueMap: {[key in ResourceT]: KeySetT|undefined}, maxMap: {[key in ResourceT]: KeySetT|undefined}, object: ObjectT, resource: ResourceT): ObjectT {
    const valueField = valueMap[resource]
    const maxField = maxMap[resource]

    const isValidValue = typeof valueField !== "undefined" && object.hasOwnProperty(valueField)
    const isValidMax = typeof maxField !== "undefined" && object.hasOwnProperty(maxField)

    const result: { -readonly [key in keyof ObjectT]: ObjectT[key] } = {...object}
    if (isValidValue) {
        delete result[valueField as KeySetT]
    }
    if (isValidMax) {
        delete result[maxField as KeySetT]
    }
    return result as ObjectT
}

export interface ResourceManipulator<ObjectT, ResourceT> {
    getValue(object: ObjectT, resource: ResourceT): number|undefined
    getMax(object: ObjectT, resource: ResourceT): number|undefined
    setValue(object: ObjectT, resource: ResourceT, value: number): ObjectT
    setMax(object: ObjectT, resource: ResourceT, max: number): ObjectT
    setMetered(object: ObjectT, resource: ResourceT, value: number, max: number): ObjectT
    applyDelta(object: ObjectT, resource: ResourceT, delta: number): ObjectT
    clear(object: ObjectT, resource: ResourceT): ObjectT
}

export function createResourceManipulator<KeySetT extends string|number|symbol, ObjectT extends {[key in KeySetT]?: number},
    ResourceT extends string|number|symbol>(valueMap: {[key in ResourceT]: KeySetT|undefined}, maxMap: {[key in ResourceT]: KeySetT|undefined}): ResourceManipulator<ObjectT, ResourceT> {
    return {
        getValue(object: ObjectT, resource: ResourceT): number | undefined {
            return getResourceValue(valueMap, object, resource)
        },
        applyDelta(object: ObjectT, resource: ResourceT, delta: number): ObjectT {
            return applyResourceDelta(valueMap, maxMap, object, resource, delta)
        },
        getMax(object: ObjectT, resource: ResourceT): number | undefined {
            return getResourceValue(maxMap, object, resource)
        },
        setMax(object: ObjectT, resource: ResourceT, max: number): ObjectT {
            return setResourceMax(valueMap, maxMap, object, resource, max)
        },
        setMetered(object: ObjectT, resource: ResourceT, value: number, max: number): ObjectT {
            return setMeteredResource(valueMap, maxMap, object, resource, value, max);
        },
        setValue(object: ObjectT, resource: ResourceT, value: number): ObjectT {
            return setResourceValue(valueMap, maxMap, object, resource, value);
        },
        clear(object: ObjectT, resource: ResourceT): ObjectT {
            return clearResource(valueMap, maxMap, object, resource)
        }
    }
}