import ComputedType from "./entity/ComputedType.js"
import Configuration from "./Configuration.js"
import MirroredEntity from "./entity/MirroredEntity.js"
import Union from "./entity/Union.js"

export default class Utility {

    static booleanConverter = {
        fromAttribute: (value, type) => {
            value ? "true" : "false"
        },
        toAttribute: (value, type) => {
            if (value === true) {
                return "true"
            }
            if (value === false) {
                return "false"
            }
            return ""
        }
    }

    /** @param {Number} x */
    static sigmoid(x, curvature = 1.7) {
        return 1 / (1 + (x / (1 - x) ** -curvature))
    }

    /** @param {Number} x */
    static sigmoidPositive(x, curvature = 3.7, length = 1.1) {
        return 1 - Math.exp(-((x / length) ** curvature))
    }

    /** @param {Number} value */
    static clamp(value, min = -Infinity, max = Infinity) {
        return Math.min(Math.max(value, min), max)
    }

    /** @param {HTMLElement} element */
    static getScale(element) {
        // @ts-expect-error
        const scale = element.blueprint?.getScale() ?? getComputedStyle(element).getPropertyValue("--ueb-scale")
        return scale != "" ? parseFloat(scale) : 1
    }

    /**
     * @param {Number} num
     * @param {Number} decimals
     */
    static minDecimals(num, decimals = 1, epsilon = 1e-8) {
        const powered = num * 10 ** decimals
        if (Math.abs(powered % 1) > epsilon) {
            // More decimal digits than required
            return num.toString()
        }
        return num.toFixed(decimals)
    }

    /** @param {String} value */
    static numberFromText(value = "") {
        value = value.toLowerCase()
        switch (value) {
            case "zero": return 0
            case "one": return 1
            case "two": return 2
            case "three": return 3
            case "four": return 4
            case "five": return 5
            case "six": return 6
            case "seven": return 7
            case "eight": return 8
            case "nine": return 9
        }
    }

    /**
     * @param {Number} num
     * @param {Number} decimals
     */
    static roundDecimals(num, decimals = 1) {
        const power = 10 ** decimals
        return Math.round(num * power) / power
    }

    /** @param {Number} num */
    static printNumber(num) {
        if (num == Number.POSITIVE_INFINITY) {
            return "inf"
        } else if (num == Number.NEGATIVE_INFINITY) {
            return "-inf"
        }
        return Utility.minDecimals(num)
    }

    /** @param {Number} num */
    static printExponential(num) {
        if (num == Number.POSITIVE_INFINITY) {
            return "inf"
        } else if (num == Number.NEGATIVE_INFINITY) {
            return "-inf"
        }
        const int = Math.round(num)
        if (int >= 1000) {
            const exp = Math.floor(Math.log10(int))
            const dec = Math.round(num / 10 ** (exp - 2)) / 100
            // Not using num.toExponential() because of the omitted leading 0 on the exponential
            return `${dec}e+${exp < 10 ? "0" : ""}${exp}`
        }
        const intPart = Math.floor(num)
        if (intPart == 0) {
            return num.toString()
        }
        return this.roundDecimals(num, Math.max(0, 3 - Math.floor(num).toString().length)).toString()
    }

    /**
     * @param {Number} a
     * @param {Number} b
     */
    static approximatelyEqual(a, b, epsilon = 1e-8) {
        return !(Math.abs(a - b) > epsilon)
    }

    /**
     * @param {Coordinates} viewportLocation
     * @param {HTMLElement} movementElement
     */
    static convertLocation(viewportLocation, movementElement, ignoreScale = false) {
        const scaleCorrection = ignoreScale ? 1 : 1 / Utility.getScale(movementElement)
        const bounding = movementElement.getBoundingClientRect()
        const location = /** @type {Coordinates} */([
            Math.round((viewportLocation[0] - bounding.x) * scaleCorrection),
            Math.round((viewportLocation[1] - bounding.y) * scaleCorrection)
        ])
        return location
    }

    /**
     * @param {Attribute} entity
     * @param {String} key
     * @returns {Boolean}
     */
    static isSerialized(entity, key) {
        return entity["attributes"]?.[key]?.serialized
            ?? entity.constructor["attributes"]?.[key]?.serialized
            ?? false
    }

    /** @param {String[]} keys */
    static objectGet(target, keys, defaultValue = undefined) {
        if (target === undefined) {
            return undefined
        }
        if (!(keys instanceof Array)) {
            throw new TypeError("UEBlueprint: Expected keys to be an array")
        }
        if (keys.length == 0 || !(keys[0] in target) || target[keys[0]] === undefined) {
            return defaultValue
        }
        if (keys.length == 1) {
            return target[keys[0]]
        }
        return Utility.objectGet(target[keys[0]], keys.slice(1), defaultValue)
    }

    /**
     * @param {String[]} keys
     * @returns {Boolean}
     */
    static objectSet(target, keys, value, defaultDictType = Object) {
        if (!(keys instanceof Array)) {
            throw new TypeError("Expected keys to be an array.")
        }
        if (keys.length == 1) {
            if (keys[0] in target || target[keys[0]] === undefined) {
                target[keys[0]] = value
                return true
            }
        } else if (keys.length > 0) {
            if (!(target[keys[0]] instanceof Object)) {
                target[keys[0]] = new defaultDictType()
            }
            return Utility.objectSet(target[keys[0]], keys.slice(1), value, defaultDictType)
        }
        return false
    }

    /**
     * @param {Attribute} a
     * @param {Attribute} b
     */
    static equals(a, b) {
        // Here we cannot check both instanceof IEntity because this would introduce a circular include dependency
        if (/** @type {IEntity?} */(a)?.equals && /** @type {IEntity?} */(b)?.equals) {
            return /** @type {IEntity} */(a).equals(/** @type {IEntity} */(b))
        }
        a = Utility.sanitize(a)
        b = Utility.sanitize(b)
        if (a?.constructor === BigInt && b?.constructor === Number) {
            b = BigInt(b)
        } else if (a?.constructor === Number && b?.constructor === BigInt) {
            a = BigInt(a)
        }
        if (a === b) {
            return true
        }
        if (a instanceof Array && b instanceof Array) {
            return a.length === b.length && a.every((value, i) => Utility.equals(value, b[i]))
        }
        return false
    }

    /**
     * @template {Attribute | AttributeTypeDescription} T
     * @param {T} value
     * @returns {AttributeConstructor<T>}
     */
    static getType(value) {
        if (value === null) {
            return null
        }
        if (value?.constructor === Object && /** @type {AttributeInformation} */(value)?.type instanceof Function) {
            return /** @type {AttributeInformation} */(value).type
        }
        return /** @type {AttributeConstructor<any>} */(value?.constructor)
    }

    /**
     * @template {Attribute} V
     * @template {AttributeConstructor<V>} C
     * @param {C} type
     * @returns {value is InstanceType<C>}
     */
    static isValueOfType(value, type, acceptNull = false) {
        if (type instanceof MirroredEntity) {
            type = type.getTargetType()
        }
        return (acceptNull && value === null) || value instanceof type || value?.constructor === type
    }

    /** @param {Attribute} value */
    static sanitize(value, targetType = /** @type {AttributeTypeDescription } */(value?.constructor)) {
        if (targetType instanceof Array) {
            targetType = targetType[0]
        }
        if (targetType instanceof ComputedType) {
            return value // The type is computed, can't say anything about it
        }
        if (targetType instanceof Union) {
            let type = targetType.values.find(t => Utility.isValueOfType(value, t, false))
            if (!type) {
                type = targetType.values[0]
            }
            targetType = type
        }
        if (targetType instanceof MirroredEntity) {
            if (value instanceof MirroredEntity) {
                return value
            }
            return Utility.sanitize(value, targetType.getTargetType())
        }
        if (targetType && !Utility.isValueOfType(value, targetType, true)) {
            value = targetType === BigInt
                ? BigInt(/** @type {Number} */(value))
                : new /** @type {EntityConstructor} */(targetType)(value)
        }
        if (value instanceof Boolean || value instanceof Number || value instanceof String) {
            value = /** @type {TerminalAttribute} */(value.valueOf()) // Get the relative primitive value
        }
        return value
    }

    /**
     * @param {Number} x
     * @param {Number} y
     * @param {Number} gridSize
     * @returns {Coordinates}
     */
    static snapToGrid(x, y, gridSize) {
        if (gridSize === 1) {
            return [x, y]
        }
        return [
            gridSize * Math.floor(x / gridSize),
            gridSize * Math.floor(y / gridSize)
        ]
    }

    /**
     * @template T
     * @param {Array<T>} a
     * @param {Array<T>} b
     */
    static mergeArrays(a = [], b = []) {
        let result = []
        a = [...a]
        b = [...b]
        restart:
        while (true) {
            for (let j = 0; j < b.length; ++j) {
                for (let i = 0; i < a.length; ++i) {
                    if (a[i] == b[j]) {
                        // Found an element in common in the two arrays
                        result.push(
                            // Take and append all the elements skipped from a
                            ...a.splice(0, i),
                            // Take and append all the elements skippend from b
                            ...b.splice(0, j),
                            // Take and append the element in common
                            ...a.splice(0, 1)
                        )
                        b.shift() // Remove the same element from b
                        continue restart
                    }
                }
            }
            break restart
        }
        // Append remaining the elements in the arrays and make it unique
        return [...(new Set(result.concat(...a, ...b)))]
    }

    /** @param {String} value */
    static escapeString(value) {
        return value
            .replaceAll(new RegExp(`(${Configuration.stringEscapedCharacters.source})`, "g"), '\\$1')
            .replaceAll("\n", "\\n") // Replace newline with \n
            .replaceAll("\t", "\\t") // Replace tab with \t
    }

    /** @param {String} value */
    static unescapeString(value) {
        return value
            .replaceAll(new RegExp(Configuration.unescapedBackslash.source + "t", "g"), "\t") // Replace tab with \t
            .replaceAll(new RegExp(Configuration.unescapedBackslash.source + "n", "g"), "\n") // Replace newline with \n
            .replaceAll(new RegExp(`\\\\(${Configuration.stringEscapedCharacters.source})`, "g"), "$1")
    }

    /** @param {String} value */
    static clearHTMLWhitespace(value) {
        return value
            .replaceAll("&nbsp;", "\u00A0") // whitespace
            .replaceAll(/<br\s*\/>|<br>/g, "\n") // newlines
            .replaceAll(/(\<!--.*?\-->)/g, "") // html comments
    }

    /** @param {String} value */
    static encodeHTMLWhitespace(value) {
        return value.replaceAll(" ", "\u00A0")
    }

    /** @param {String} value */
    static capitalFirstLetter(value) {
        if (value.length === 0) {
            return value
        }
        return value.charAt(0).toUpperCase() + value.slice(1)
    }

    /** @param {String} value */
    static formatStringName(value = "") {
        return value
            // Remove leading b (for boolean values) or newlines
            .replace(/^\s*b(?=[A-Z])/, "")
            // Insert a space where needed, possibly removing unnecessary elading characters
            .replaceAll(Configuration.nameRegexSpaceReplacement, " ")
            .trim()
            .split(" ")
            .map(v => Utility.capitalFirstLetter(v))
            .join(" ")
    }

    /** @param {String} value */
    static getIdFromReference(value) {
        return value
            .replace(/(?:.+\.)?([^\.]+)$/, "$1")
            .replaceAll(/(?<=[a-z\d])(?=[A-Z])|(?<=[a-zA-Z])(?=\d)|(?<=[A-Z]{2})(?=[A-Z][a-z])/g, "-")
            .toLowerCase()
    }

    /** @param {String} pathValue */
    static getNameFromPath(pathValue) {
        return pathValue.match(/[^\.\/]+$/)?.[0] ?? ""
    }

    /** @param {LinearColorEntity} value */
    static printLinearColor(value) {
        return `${Math.round(value.R.valueOf() * 255)}, ${Math.round(value.G.valueOf() * 255)}, ${Math.round(value.B.valueOf() * 255)}`
    }

    /**
     * @param {Number} x
     * @param {Number} y
     * @returns {Coordinates}
     */
    static getPolarCoordinates(x, y, positiveTheta = false) {
        let theta = Math.atan2(y, x)
        if (positiveTheta && theta < 0) {
            theta = 2 * Math.PI + theta
        }
        return [
            Math.sqrt(x * x + y * y),
            theta,
        ]
    }

    /**
     * @param {Number} r
     * @param {Number} theta
     * @returns {Coordinates}
     */
    static getCartesianCoordinates(r, theta) {
        return [
            r * Math.cos(theta),
            r * Math.sin(theta)
        ]
    }

    /**
     * @param {Number} begin
     * @param {Number} end
     */
    static range(begin = 0, end = 0, step = end >= begin ? 1 : -1) {
        return Array.from({ length: Math.ceil((end - begin) / step) }, (_, i) => begin + (i * step))
    }

    /**
     * @param {HTMLElement} element
     * @param {String} value
     */
    static paste(element, value) {
        const event = new ClipboardEvent("paste", {
            bubbles: true,
            cancelable: true,
            clipboardData: new DataTransfer(),
        })
        event.clipboardData.setData("text", value)
        element.dispatchEvent(event)
    }

    /** @param {Blueprint} blueprint */
    static async copy(blueprint) {
        const event = new ClipboardEvent("copy", {
            bubbles: true,
            cancelable: true,
            clipboardData: new DataTransfer(),
        })
        blueprint.dispatchEvent(event)
    }

    static animate(
        from,
        to,
        intervalSeconds,
        callback,
        acknowledgeRequestAnimationId = id => { },
        timingFunction = x => {
            const v = x ** 3.5
            return v / (v + ((1 - x) ** 3.5))
        }
    ) {
        let startTimestamp
        const doAnimation = currentTimestamp => {
            if (startTimestamp === undefined) {
                startTimestamp = currentTimestamp
            }
            let delta = (currentTimestamp - startTimestamp) / intervalSeconds
            if (Utility.approximatelyEqual(delta, 1) || delta > 1) {
                delta = 1
            } else {
                acknowledgeRequestAnimationId(requestAnimationFrame(doAnimation))
            }
            const currentValue = from + (to - from) * timingFunction(delta)
            callback(currentValue)
        }
        acknowledgeRequestAnimationId(requestAnimationFrame(doAnimation))
    }
}