// ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
// ┃ ██████ ██████ ██████       █      █      █      █      █ █▄  ▀███ █       ┃
// ┃ ▄▄▄▄▄█ █▄▄▄▄▄ ▄▄▄▄▄█  ▀▀▀▀▀█▀▀▀▀▀ █ ▀▀▀▀▀█ ████████▌▐███ ███▄  ▀█ █ ▀▀▀▀▀ ┃
// ┃ █▀▀▀▀▀ █▀▀▀▀▀ █▀██▀▀ ▄▄▄▄▄ █ ▄▄▄▄▄█ ▄▄▄▄▄█ ████████▌▐███ █████▄   █ ▄▄▄▄▄ ┃
// ┃ █      ██████ █  ▀█▄       █ ██████      █      ███▌▐███ ███████▄ █       ┃
// ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
// ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
// ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
// ┃ This file is part of the Perspective library, distributed under the terms ┃
// ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
// ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

import * as d3Array from "d3-array";
import { defaultPadding } from "../padding/default";
import { Pad, PadUnit, PaddingStrategy } from "../../types";

export type SymmetricalAbout = number | null;

export interface ExtentLinear {
    (data: any[]): PaddingStrategy;
    accessors: (nextAccessors?: any[]) => any;

    pad(): Pad;
    pad(nextPad: Pad): ExtentLinear;

    padUnit(): PadUnit;
    padUnit(nextPadUnit: PadUnit): ExtentLinear;

    include(): number[];
    include(nextInclude?: number[]): ExtentLinear;

    symmetricalAbout(): number | null;
    symmetricalAbout(nextSymmetricalAbout?: number | null): ExtentLinear;

    paddingStrategy(): PaddingStrategy;
    paddingStrategy(nextPaddingStrategy?: any): ExtentLinear;
}

export const extentLinear = function (): ExtentLinear {
    let accessors = [
        function (d) {
            return d;
        },
    ];
    let symmetricalAbout: number | null = null;
    let include: number[] = [];
    let paddingStrategy = defaultPadding();

    const instance: Partial<ExtentLinear> = function instance(
        data,
    ): PaddingStrategy {
        let values = new Array(data.length);
        let _iteratorNormalCompletion = true;
        let _didIteratorError = false;
        let _iteratorError = undefined;

        let _iterator = accessors[Symbol.iterator]();
        try {
            for (
                let _step;
                !(_iteratorNormalCompletion = (_step = _iterator.next()).done);
                _iteratorNormalCompletion = true
            ) {
                let accessor = _step.value;

                for (let i = 0; i < data.length; i++) {
                    let value = accessor(data[i], i);
                    if (Array.isArray(value)) {
                        values.push.apply(values, toConsumableArray(value));
                    } else {
                        values.push(value);
                    }
                }
            }
        } catch (err) {
            _didIteratorError = true;
            _iteratorError = err;
        } finally {
            try {
                if (!_iteratorNormalCompletion && _iterator.return) {
                    _iterator.return();
                }
            } finally {
                if (_didIteratorError) {
                    throw _iteratorError;
                }
            }
        }

        let extent$$1 = [d3Array.min(values), d3Array.max(values)];

        extent$$1[0] =
            extent$$1[0] == null
                ? d3Array.min(include)
                : d3Array.min(
                      [extent$$1[0]].concat(toConsumableArray(include)),
                  );
        extent$$1[1] =
            extent$$1[1] == null
                ? d3Array.max(include)
                : d3Array.max(
                      [extent$$1[1]].concat(toConsumableArray(include)),
                  );

        if (symmetricalAbout != null) {
            let halfRange = Math.max(
                Math.abs(extent$$1[1] - symmetricalAbout),
                Math.abs(extent$$1[0] - symmetricalAbout),
            );
            extent$$1[0] = symmetricalAbout - halfRange;
            extent$$1[1] = symmetricalAbout + halfRange;
        }

        return paddingStrategy(extent$$1);
    };

    instance.accessors = function () {
        if (!arguments.length) {
            return accessors;
        }
        accessors = arguments.length <= 0 ? undefined : arguments[0];
        return instance;
    };

    //This function points directly at the paddingStrategy child object's
    //properties for backwards-compatibility. DEPRECATED.
    instance.pad = function (...args: Pad[]): any {
        if (!args.length) {
            return paddingStrategy.pad;
        }

        paddingStrategy.pad(args[0]);

        return instance;
    };

    //This function points directly at the paddingStrategy child object's
    //properties for backwards-compatibility. DEPRECATED.
    instance.padUnit = function (...args: PadUnit[]): any {
        if (!args.length) {
            return paddingStrategy.padUnit;
        }

        paddingStrategy.padUnit(args[0]);

        return instance;
    };

    instance.include = function (...args: number[][]): any {
        if (!args.length) {
            return include;
        }

        include = args[0];

        return instance;
    };

    instance.symmetricalAbout = function (...args: SymmetricalAbout[]): any {
        if (!args.length) {
            return symmetricalAbout;
        }

        symmetricalAbout = args[0];

        return instance;
    };

    instance.paddingStrategy = function (...args: PaddingStrategy[]): any {
        if (!args.length) {
            return paddingStrategy;
        }

        paddingStrategy = args[0];

        return instance;
    };

    return instance as ExtentLinear;
};

let toConsumableArray = function (arr) {
    if (Array.isArray(arr)) {
        let arr2 = Array(arr.length);
        for (let i = 0; i < arr.length; i++) {
            arr2[i] = arr[i];
        }
        return arr2;
    } else {
        return Array.from(arr);
    }
};