/**
 * Typescript definition tests for d3/d3-array module
 *
 * Note: These tests are intended to test the definitions only
 * in the sense of typing and call signature consistency. They
 * are not intended as functional tests.
 */

import * as d3Array from 'd3-array';
import { scaleTime } from 'd3-scale';
import { timeYear } from 'd3-time';

// -----------------------------------------------------------------------------
// Preparatory Steps
// -----------------------------------------------------------------------------

class NumCoercible {
    a: number;

    constructor(a: number) {
        this.a = a;
    }
    valueOf() {
        return this.a;
    }
}

class MixedObject {
    num: number;
    str: string;
    numeric: NumCoercible;
    date: Date;

    constructor(a: number, date: Date) {
        this.num = a;
        this.str = a.toString();
        this.numeric = new NumCoercible(a);
        this.date = date;
    }
}

let num: number;
let date: Date;

let numOrUndefined: number | undefined;
let strOrUndefined: string | undefined;
let numericOrUndefined: NumCoercible | undefined;
let dateOrUndefined: Date | undefined;
let numOrUndefinedExtent: [number, number] | [undefined, undefined];
let strOrUndefinedExtent: [string, string] | [undefined, undefined];
let numericOrUndefinedExtent: [NumCoercible, NumCoercible] | [undefined, undefined];
let dateMixedOrUndefined: [Date, Date] | [undefined, undefined];
let mixedOrUndefinedExtent: [d3Array.Primitive | NumCoercible, d3Array.Primitive | NumCoercible] | [undefined, undefined];
let dateOrUndefinedExtent: [Date, Date] | [undefined, undefined];

let numbersArray = [10, 20, 30, 40, 50];
const numbersOrUndefinedArray = [10, 20, undefined, null, 40, 50];
let stringyNumbersArray = ['10', '20', '30', '40', '50'];
const numericArray = [new NumCoercible(10), new NumCoercible(20), new NumCoercible(30), new NumCoercible(40), new NumCoercible(50)];
let dateArray = [new Date(2016, 6, 1), new Date(2016, 7, 30), new Date(2015, 3, 15)];

const mixedObjectArray = [
    new MixedObject(10, new Date(2016, 6, 1)),
    new MixedObject(20, new Date(2016, 7, 30)),
    new MixedObject(30, new Date(2015, 3, 15)),
    new MixedObject(40, new Date(2014, 3, 15)),
    new MixedObject(50, new Date(2017, 4, 15))
];

const mixedObjectOrUndefinedArray = [...mixedObjectArray, undefined];

let typedArray = Uint8Array.from(numbersArray);
let readonlyNumbersArray = numbersArray as ReadonlyArray<number>;
const readonlyNumbersOrUndefinedArray = numbersOrUndefinedArray as ReadonlyArray<number>;
const readonlyStringyNumbersArray = stringyNumbersArray as ReadonlyArray<string>;
const readonlyNumericArray = numericArray as ReadonlyArray<NumCoercible>;
const readonlyDateArray = dateArray as ReadonlyArray<Date>;
const readonlyMixedObjectArray = mixedObjectArray as ReadonlyArray<MixedObject>;
const readonlyMixedObjectOrUndefinedArray = mixedObjectOrUndefinedArray as ReadonlyArray<MixedObject>;

function accessorMixedObjectToNum(datum: MixedObject, index: number, array: MixedObject[]): number {
    return datum.num;
}

function accessorMixedObjectToStr(datum: MixedObject, index: number, array: MixedObject[]): string {
    return datum.str;
}

function accessorMixedObjectToNumeric(datum: MixedObject, index: number, array: MixedObject[]): NumCoercible {
    return datum.numeric;
}

function accessorMixedObjectToDate(datum: MixedObject, index: number, array: MixedObject[]): Date {
    return datum.date;
}

function accessorMixedObjectToNumOrUndefined(datum: MixedObject | undefined, index: number, array: Array<MixedObject | undefined>): number | undefined | null {
    return datum ? datum.num : undefined;
}

function accessorMixedObjectToStrOrUndefined(datum: MixedObject | undefined, index: number, array: MixedObject[]): string | undefined | null {
    return datum ? datum.str : undefined;
}

// -----------------------------------------------------------------------------
// Test Statistics
// -----------------------------------------------------------------------------

// max() -----------------------------------------------------------------------

// without accessors

numOrUndefined = d3Array.max(numbersArray);
strOrUndefined = d3Array.max(stringyNumbersArray);
numericOrUndefined = d3Array.max(numericArray);
dateOrUndefined = d3Array.max(dateArray);

// ArrayLike test cases

numOrUndefined = d3Array.max(typedArray);
numOrUndefined = d3Array.max(readonlyNumbersOrUndefinedArray);
strOrUndefined = d3Array.max(readonlyStringyNumbersArray);
numericOrUndefined = d3Array.max(readonlyNumericArray);
dateOrUndefined = d3Array.max(readonlyDateArray);

// with accessors

numOrUndefined = d3Array.max(mixedObjectArray, accessorMixedObjectToNum);
strOrUndefined = d3Array.max(mixedObjectArray, accessorMixedObjectToStr);
numericOrUndefined = d3Array.max(mixedObjectArray, accessorMixedObjectToNumeric);
dateOrUndefined = d3Array.max(mixedObjectArray, accessorMixedObjectToDate);
numOrUndefined = d3Array.max(mixedObjectArray, accessorMixedObjectToNumOrUndefined);
strOrUndefined = d3Array.max(mixedObjectArray, accessorMixedObjectToStrOrUndefined);
numOrUndefined = d3Array.max(readonlyMixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);

// min() -----------------------------------------------------------------------

// without accessors

numOrUndefined = d3Array.min(numbersArray);
strOrUndefined = d3Array.min(stringyNumbersArray);
numericOrUndefined = d3Array.min(numericArray);
dateOrUndefined = d3Array.min(dateArray);

// ArrayLike test cases

numOrUndefined = d3Array.min(typedArray);
numOrUndefined = d3Array.min(readonlyNumbersOrUndefinedArray);
strOrUndefined = d3Array.min(readonlyStringyNumbersArray);
numericOrUndefined = d3Array.min(readonlyNumericArray);
dateOrUndefined = d3Array.min(readonlyDateArray);

// with accessors

numOrUndefined = d3Array.min(mixedObjectArray, accessorMixedObjectToNum);
strOrUndefined = d3Array.min(mixedObjectArray, accessorMixedObjectToStr);
numericOrUndefined = d3Array.min(mixedObjectArray, accessorMixedObjectToNumeric);
dateOrUndefined = d3Array.min(mixedObjectArray, accessorMixedObjectToDate);
numOrUndefined = d3Array.min(mixedObjectArray, accessorMixedObjectToNumOrUndefined);
strOrUndefined = d3Array.min(mixedObjectArray, accessorMixedObjectToStrOrUndefined);
numOrUndefined = d3Array.max(readonlyMixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);

// extent() --------------------------------------------------------------------

// without accessors

numOrUndefinedExtent = d3Array.extent(numbersArray);
strOrUndefinedExtent = d3Array.extent(stringyNumbersArray);
numericOrUndefinedExtent = d3Array.extent(numericArray);
dateOrUndefinedExtent = d3Array.extent(dateArray);

// ArrayLike test cases

numOrUndefinedExtent = d3Array.extent(typedArray);
numOrUndefinedExtent = d3Array.extent(readonlyNumbersOrUndefinedArray);
strOrUndefinedExtent = d3Array.extent(readonlyStringyNumbersArray);
numericOrUndefinedExtent = d3Array.extent(readonlyNumericArray);
dateOrUndefinedExtent = d3Array.extent(readonlyDateArray);

// with accessors

numOrUndefinedExtent = d3Array.extent(mixedObjectArray, accessorMixedObjectToNum);
strOrUndefinedExtent = d3Array.extent(mixedObjectArray, accessorMixedObjectToStr);
mixedOrUndefinedExtent = d3Array.extent(mixedObjectArray, accessorMixedObjectToNumeric);
dateMixedOrUndefined = d3Array.extent(mixedObjectArray, accessorMixedObjectToDate);
numOrUndefinedExtent = d3Array.extent(mixedObjectArray, accessorMixedObjectToNumOrUndefined);
strOrUndefinedExtent = d3Array.extent(mixedObjectArray, accessorMixedObjectToStrOrUndefined);
numOrUndefinedExtent = d3Array.extent(readonlyMixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);

// mean() ----------------------------------------------------------------------

numOrUndefined = d3Array.mean(numbersArray);
numOrUndefined = d3Array.mean(numericArray);
numOrUndefined = d3Array.mean(numbersOrUndefinedArray);

numOrUndefined = d3Array.mean(typedArray);
numOrUndefined = d3Array.mean(readonlyNumbersOrUndefinedArray);
numOrUndefined = d3Array.mean(readonlyNumericArray);
numOrUndefined = d3Array.mean(readonlyNumbersOrUndefinedArray);

numOrUndefined = d3Array.mean(mixedObjectArray, accessorMixedObjectToNum);
numOrUndefined = d3Array.mean(mixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);
numOrUndefined = d3Array.mean(readonlyMixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);

// median() --------------------------------------------------------------------

numOrUndefined = d3Array.median(numbersArray);
numOrUndefined = d3Array.median(numericArray);
numOrUndefined = d3Array.median(numbersOrUndefinedArray);

numOrUndefined = d3Array.median(typedArray);
numOrUndefined = d3Array.median(readonlyNumbersArray);
numOrUndefined = d3Array.median(readonlyNumericArray);
numOrUndefined = d3Array.median(readonlyNumbersOrUndefinedArray);

numOrUndefined = d3Array.median(mixedObjectArray, accessorMixedObjectToNum);
numOrUndefined = d3Array.median(mixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);
numOrUndefined = d3Array.median(readonlyMixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);

// quantile() ------------------------------------------------------------------

numOrUndefined = d3Array.quantile(numbersArray, 0.5);
numOrUndefined = d3Array.quantile(numericArray, 0.5);
numOrUndefined = d3Array.quantile(numbersOrUndefinedArray, 0.5);

numOrUndefined = d3Array.quantile(typedArray, 0.5);
numOrUndefined = d3Array.quantile(readonlyNumbersArray, 0.5);
numOrUndefined = d3Array.quantile(readonlyNumericArray, 0.5);
numOrUndefined = d3Array.quantile(readonlyNumbersOrUndefinedArray, 0.5);

numOrUndefined = d3Array.quantile(mixedObjectArray, 0.5, accessorMixedObjectToNum);
numOrUndefined = d3Array.quantile(mixedObjectOrUndefinedArray, 0.5, accessorMixedObjectToNumOrUndefined);
numOrUndefined = d3Array.quantile(readonlyMixedObjectOrUndefinedArray, 0.5, accessorMixedObjectToNumOrUndefined);

// sum() -----------------------------------------------------------------------

numOrUndefined = d3Array.sum(numbersArray);
numOrUndefined = d3Array.sum(numericArray);
numOrUndefined = d3Array.sum(numbersOrUndefinedArray);

numOrUndefined = d3Array.sum(typedArray);
numOrUndefined = d3Array.sum(readonlyNumbersArray);
numOrUndefined = d3Array.sum(readonlyNumericArray);
numOrUndefined = d3Array.sum(readonlyNumbersOrUndefinedArray);

numOrUndefined = d3Array.sum(mixedObjectArray, accessorMixedObjectToNum);
numOrUndefined = d3Array.sum(mixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);
numOrUndefined = d3Array.sum(readonlyMixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);

// deviation() -----------------------------------------------------------------

numOrUndefined = d3Array.deviation(numbersArray);
numOrUndefined = d3Array.deviation(numericArray);
numOrUndefined = d3Array.deviation(numbersOrUndefinedArray);

numOrUndefined = d3Array.deviation(typedArray);
numOrUndefined = d3Array.deviation(readonlyNumbersArray);
numOrUndefined = d3Array.deviation(readonlyNumericArray);
numOrUndefined = d3Array.deviation(readonlyNumbersOrUndefinedArray);

numOrUndefined = d3Array.deviation(mixedObjectArray, accessorMixedObjectToNum);
numOrUndefined = d3Array.deviation(mixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);
numOrUndefined = d3Array.deviation(readonlyMixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);

// variance() ------------------------------------------------------------------

numOrUndefined = d3Array.variance(numbersArray);
numOrUndefined = d3Array.variance(numericArray);
numOrUndefined = d3Array.variance(numbersOrUndefinedArray);

numOrUndefined = d3Array.variance(typedArray);
numOrUndefined = d3Array.variance(readonlyNumbersArray);
numOrUndefined = d3Array.variance(readonlyNumericArray);
numOrUndefined = d3Array.variance(readonlyNumbersOrUndefinedArray);

numOrUndefined = d3Array.variance(mixedObjectArray, accessorMixedObjectToNum);
numOrUndefined = d3Array.variance(mixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);
numOrUndefined = d3Array.variance(readonlyMixedObjectOrUndefinedArray, accessorMixedObjectToNumOrUndefined);

// -----------------------------------------------------------------------------
// Test Searching Arrays
// -----------------------------------------------------------------------------

numbersArray = [0, 2, 3, 4, 7, 8];
stringyNumbersArray = ['0', '2', '3', '4', '7', '8'];
dateArray = [new Date(2010, 1, 1), new Date(2011, 1, 1), new Date(2012, 1, 1), new Date(2013, 1, 1)];
typedArray = Uint8Array.from(numbersArray);

// scan() ----------------------------------------------------------------------

numOrUndefined = d3Array.scan(numbersArray);
numOrUndefined = d3Array.scan(typedArray);
numOrUndefined = d3Array.scan(readonlyNumbersArray);

numOrUndefined = d3Array.scan(mixedObjectArray, (a, b) => {
    const aElem: MixedObject = a;
    const bElem: MixedObject = b;
    return a.num - b.num;
});

numOrUndefined = d3Array.scan(readonlyMixedObjectArray, (a, b) => {
    const aElem: MixedObject = a;
    const bElem: MixedObject = b;
    return a.num - b.num;
});

numOrUndefined = d3Array.scan(mixedObjectOrUndefinedArray, (a, b) => {
    const aElem: MixedObject | undefined = a;
    const bElem: MixedObject | undefined = b;
    return a && b ? a.num - b.num : NaN;
});

numOrUndefined = d3Array.scan(readonlyMixedObjectOrUndefinedArray, (a, b) => {
    const aElem: MixedObject | undefined = a;
    const bElem: MixedObject | undefined = b;
    return a && b ? a.num - b.num : NaN;
});

// bisectLeft() ----------------------------------------------------------------

num = d3Array.bisectLeft(numbersArray, 4);
num = d3Array.bisectLeft(numbersArray, 4, 1);
num = d3Array.bisectLeft(numbersArray, 4, 1, 4);

num = d3Array.bisectLeft(stringyNumbersArray, '21');
num = d3Array.bisectLeft(stringyNumbersArray, '21', 1);
num = d3Array.bisectLeft(stringyNumbersArray, '21', 1, 4);

num = d3Array.bisectLeft(dateArray, new Date(2011, 2, 1));
num = d3Array.bisectLeft(dateArray, new Date(2011, 2, 1), 1);
num = d3Array.bisectLeft(dateArray, new Date(2011, 2, 1), 1, 2);

num = d3Array.bisectLeft(typedArray, 4);
num = d3Array.bisectLeft(typedArray, 4, 1);
num = d3Array.bisectLeft(typedArray, 4, 1, 4);

num = d3Array.bisectLeft(readonlyNumbersArray, 4);
num = d3Array.bisectLeft(readonlyNumbersArray, 4, 1);
num = d3Array.bisectLeft(readonlyNumbersArray, 4, 1, 4);

num = d3Array.bisectLeft(readonlyStringyNumbersArray, '21');
num = d3Array.bisectLeft(readonlyStringyNumbersArray, '21', 1);
num = d3Array.bisectLeft(readonlyStringyNumbersArray, '21', 1, 4);

num = d3Array.bisectLeft(readonlyDateArray, new Date(2011, 2, 1));
num = d3Array.bisectLeft(readonlyDateArray, new Date(2011, 2, 1), 1);
num = d3Array.bisectLeft(readonlyDateArray, new Date(2011, 2, 1), 1, 2);

// bisectRight() ---------------------------------------------------------------

num = d3Array.bisectRight(numbersArray, 4);
num = d3Array.bisectRight(numbersArray, 4, 1);
num = d3Array.bisectRight(numbersArray, 4, 1, 4);

num = d3Array.bisectRight(stringyNumbersArray, '21');
num = d3Array.bisectRight(stringyNumbersArray, '21', 1);
num = d3Array.bisectRight(stringyNumbersArray, '21', 1, 4);

num = d3Array.bisectRight(dateArray, new Date(2011, 2, 1));
num = d3Array.bisectRight(dateArray, new Date(2011, 2, 1), 1);
num = d3Array.bisectRight(dateArray, new Date(2011, 2, 1), 1, 2);

num = d3Array.bisectRight(typedArray, 4);
num = d3Array.bisectRight(typedArray, 4, 1);
num = d3Array.bisectRight(typedArray, 4, 1, 4);

num = d3Array.bisectRight(readonlyNumbersArray, 4);
num = d3Array.bisectRight(readonlyNumbersArray, 4, 1);
num = d3Array.bisectRight(readonlyNumbersArray, 4, 1, 4);

num = d3Array.bisectRight(readonlyStringyNumbersArray, '21');
num = d3Array.bisectRight(readonlyStringyNumbersArray, '21', 1);
num = d3Array.bisectRight(readonlyStringyNumbersArray, '21', 1, 4);

num = d3Array.bisectRight(readonlyDateArray, new Date(2011, 2, 1));
num = d3Array.bisectRight(readonlyDateArray, new Date(2011, 2, 1), 1);
num = d3Array.bisectRight(readonlyDateArray, new Date(2011, 2, 1), 1, 2);

// bisect() --------------------------------------------------------------------

num = d3Array.bisect(numbersArray, 4);
num = d3Array.bisect(numbersArray, 4, 1);
num = d3Array.bisect(numbersArray, 4, 1, 4);

num = d3Array.bisect(stringyNumbersArray, '21');
num = d3Array.bisect(stringyNumbersArray, '21', 1);
num = d3Array.bisect(stringyNumbersArray, '21', 1, 4);

num = d3Array.bisect(dateArray, new Date(2011, 2, 1));
num = d3Array.bisect(dateArray, new Date(2011, 2, 1), 1);
num = d3Array.bisect(dateArray, new Date(2011, 2, 1), 1, 2);

num = d3Array.bisect(typedArray, 4);
num = d3Array.bisect(typedArray, 4, 1);
num = d3Array.bisect(typedArray, 4, 1, 4);

num = d3Array.bisect(readonlyNumbersArray, 4);
num = d3Array.bisect(readonlyNumbersArray, 4, 1);
num = d3Array.bisect(readonlyNumbersArray, 4, 1, 4);

num = d3Array.bisect(readonlyStringyNumbersArray, '21');
num = d3Array.bisect(readonlyStringyNumbersArray, '21', 1);
num = d3Array.bisect(readonlyStringyNumbersArray, '21', 1, 4);

num = d3Array.bisect(readonlyDateArray, new Date(2011, 2, 1));
num = d3Array.bisect(readonlyDateArray, new Date(2011, 2, 1), 1);
num = d3Array.bisect(readonlyDateArray, new Date(2011, 2, 1), 1, 2);

// bisector() ------------------------------------------------------------------

mixedObjectArray.sort((a, b) => a.date.valueOf() - b.date.valueOf());

let mixedObjectDateBisectorObject: d3Array.Bisector<MixedObject, Date>;

// define using accessor
mixedObjectDateBisectorObject = d3Array.bisector<MixedObject, Date>(el => el.date);

// define using comparator
mixedObjectDateBisectorObject = d3Array.bisector<MixedObject, Date>((el, x) =>
    el.date.valueOf() - x.valueOf());

// bisect left
num = mixedObjectDateBisectorObject.left(mixedObjectArray, new Date(2015, 3, 14));
num = mixedObjectDateBisectorObject.left(mixedObjectArray, new Date(2015, 3, 14), 1);
num = mixedObjectDateBisectorObject.left(mixedObjectArray, new Date(2015, 3, 14), 3, 4);

num = mixedObjectDateBisectorObject.left(readonlyMixedObjectArray, new Date(2015, 3, 14));
num = mixedObjectDateBisectorObject.left(readonlyMixedObjectArray, new Date(2015, 3, 14), 1);
num = mixedObjectDateBisectorObject.left(readonlyMixedObjectArray, new Date(2015, 3, 14), 3, 4);

// bisect right
num = mixedObjectDateBisectorObject.right(mixedObjectArray, new Date(2015, 3, 14));
num = mixedObjectDateBisectorObject.right(mixedObjectArray, new Date(2015, 3, 14), 1);
num = mixedObjectDateBisectorObject.right(mixedObjectArray, new Date(2015, 3, 14), 3, 4);

num = mixedObjectDateBisectorObject.right(readonlyMixedObjectArray, new Date(2015, 3, 14));
num = mixedObjectDateBisectorObject.right(readonlyMixedObjectArray, new Date(2015, 3, 14), 1);
num = mixedObjectDateBisectorObject.right(readonlyMixedObjectArray, new Date(2015, 3, 14), 3, 4);

// ascending() -----------------------------------------------------------------

num = d3Array.ascending(undefined, 20);
num = d3Array.ascending(10, 20);
num = d3Array.ascending('10', '20');
num = d3Array.ascending(new Date(2016, 6, 13), new Date(2016, 6, 14));

// descending() ----------------------------------------------------------------

num = d3Array.descending(undefined, 20);
num = d3Array.descending(10, 20);
num = d3Array.descending('10', '20');
num = d3Array.descending(new Date(2016, 6, 13), new Date(2016, 6, 14));

// -----------------------------------------------------------------------------
// Test Transforming  Arrays
// -----------------------------------------------------------------------------

// merge() ---------------------------------------------------------------------

const testArray1 = [
    new MixedObject(10, new Date(2016, 6, 1)),
    new MixedObject(20, new Date(2016, 7, 30)),
    new MixedObject(30, new Date(2015, 3, 15)),
    new MixedObject(40, new Date(2014, 3, 15)),
    new MixedObject(50, new Date(2017, 4, 15))
];

const testArray2 = [
    new MixedObject(40, new Date(2016, 3, 1)),
    new MixedObject(50, new Date(2016, 9, 30)),
];

let testArrays: MixedObject[][] = [testArray1, testArray2];

const readonlyTestArray1 = testArray1 as ReadonlyArray<MixedObject>;
const readonlyTestArray2 = testArray2 as ReadonlyArray<MixedObject>;
const readonlyTestArrays = [testArray1, testArray2] as ReadonlyArray<ReadonlyArray<MixedObject>>;

let mergedArray: MixedObject[];

mergedArray = d3Array.merge(testArrays); // inferred type
mergedArray = d3Array.merge<MixedObject>(testArrays); // explicit type
// mergedArray = d3Array.merge<MixedObject>([[10, 40, 30], [15, 30]]); // fails, type mismatch
// mergedArray = d3Array.merge([testArray1, [15, 30]]); // fails, type mismatch

mergedArray = d3Array.merge(readonlyTestArrays); // inferred type
mergedArray = d3Array.merge<MixedObject>(readonlyTestArrays); // explicit type

// cross() ---------------------------------------------------------------------

let crossed: Array<[string, number]>;

const chars = ['x', 'y'];
const nums = [1, 2];

crossed = d3Array.cross(chars, nums);
crossed = d3Array.cross<string, number>(chars, nums);

let strArray: string[] = d3Array.cross<number, number, string>([2, 3], [5, 6], (a, b) => (a + b) + 'px');
strArray = d3Array.cross([2, 3], [5, 6], (a, b) => {
    const aa: number = a;
    const bb: number = b;
    return (aa + bb) + 'px';
});

const readonlyChars = chars as ReadonlyArray<string>;
const readonlyNums = new Uint8Array(nums);

crossed = d3Array.cross(readonlyChars, readonlyNums);
crossed = d3Array.cross<string, number>(readonlyChars, readonlyNums);

strArray = d3Array.cross<number, number, string>([2, 3] as ReadonlyArray<number>, new Uint8ClampedArray([5, 6]), (a, b) => (a + b) + 'px');
strArray = d3Array.cross([2, 3] as ReadonlyArray<number>, new Uint8ClampedArray([5, 6]), (a, b) => {
    const aa: number = a;
    const bb: number = b;
    return (aa + bb) + 'px';
});

d3Array.cross(new Uint8Array([1, 2, 3, 4, 5]), new Uint8Array([10, 20, 30, 40, 50]));

// pairs() ---------------------------------------------------------------------

let pairs: Array<[MixedObject, MixedObject]>;

pairs = d3Array.pairs(mergedArray);

numbersArray = d3Array.pairs<MixedObject, number>(mergedArray, (a, b) => b.num - a.num);
numbersArray = d3Array.pairs(mergedArray, (a, b) => {
    const aa: MixedObject = a;
    const bb: MixedObject = b;
    return bb.num - aa.num;
});

const readonlyMergedArray = mergedArray as ReadonlyArray<MixedObject>;
pairs = d3Array.pairs(readonlyMergedArray);

numbersArray = d3Array.pairs<MixedObject, number>(readonlyMergedArray, (a, b) => b.num - a.num);
numbersArray = d3Array.pairs(readonlyMergedArray, (a, b) => {
    const aa: MixedObject = a;
    const bb: MixedObject = b;
    return bb.num - aa.num;
});

// permute() -------------------------------------------------------------------

// getting a permutation of array elements
mergedArray = d3Array.permute(mergedArray, [1, 0, 2, 5, 3, 4, 6]);
mergedArray = d3Array.permute(readonlyMergedArray, [1, 0, 2, 5, 3, 4, 6]);

// Getting an ordered array with object properties

const testObject = {
    val: 10,
    name: 'Test',
    when: new Date(),
    more: [10, 30, 40]
};

const x: Array<number | string | Date | number[]> = d3Array.permute(testObject, ['name', 'val', 'when', 'more']);

// range() ---------------------------------------------------------------------

numbersArray = d3Array.range(10);
numbersArray = d3Array.range(1, 10);
numbersArray = d3Array.range(1, 10, 0.5);

// shuffle() -------------------------------------------------------------------

mergedArray = d3Array.shuffle(mergedArray);
mergedArray = d3Array.shuffle(mergedArray, 1);
mergedArray = d3Array.shuffle(mergedArray, 1, 3);
// mergedArray = d3Array.shuffle(readonlyMergedArray); // fails, shuffle mutates input array in-place

// Test each TypedArray explicitly. Can't use ArrayLike in this case because shuffle is mutable and ArrayLike would include ReadonlyArray
const resultInt8: Int8Array = d3Array.shuffle(new Int8Array(numbersArray));
const resultUint8: Uint8Array = d3Array.shuffle(new Uint8Array(numbersArray));
const resultUint8Clamped: Uint8ClampedArray = d3Array.shuffle(new Uint8ClampedArray(numbersArray));
const resultInt16: Int16Array = d3Array.shuffle(new Int16Array(numbersArray));
const resultUint6: Uint16Array = d3Array.shuffle(new Uint16Array(numbersArray));
const resultInt32: Int32Array = d3Array.shuffle(new Int32Array(numbersArray));
const resultUint32: Uint32Array = d3Array.shuffle(new Uint32Array(numbersArray));
const resultFloat32: Float32Array = d3Array.shuffle(new Float32Array(numbersArray));
const resultFloat64: Float64Array = d3Array.shuffle(new Float64Array(numbersArray));

// ticks() ---------------------------------------------------------------------

numbersArray = d3Array.ticks(1, 10, 5);

// tickIncrement() ------------------------------------------------------------------

let numDiff: number = d3Array.tickIncrement(1, 10, 5);

// tickStep() ------------------------------------------------------------------

numDiff = d3Array.tickStep(1, 10, 5);

// transpose() -----------------------------------------------------------------

testArrays = d3Array.transpose([testArray1, testArray2]);
testArrays = d3Array.transpose([readonlyTestArray1, readonlyTestArray2] as ReadonlyArray<ReadonlyArray<MixedObject>>);

// zip() -----------------------------------------------------------------------

testArrays = d3Array.zip(testArray1, testArray2);
testArrays = d3Array.zip(readonlyTestArray1, readonlyTestArray2);

// -----------------------------------------------------------------------------
// Test Histogram
// -----------------------------------------------------------------------------

const tScale = scaleTime();

// Create histogram generator ==================================================

let defaultHistogram: d3Array.HistogramGenerator<number, number>;
defaultHistogram = d3Array.histogram();

let testHistogram: d3Array.HistogramGenerator<MixedObject, Date>;
testHistogram = d3Array.histogram<MixedObject, Date>();

// Configure histogram generator ===============================================

// value(...) ------------------------------------------------------------------

testHistogram = testHistogram.value((d, i, data) => {
    const datum: MixedObject = d; // d is of type MixedObject
    const index: number = i; // i is number
    const array: ArrayLike<MixedObject> = data; // data is of type MixedObject[]
    return datum.date;
});

let valueAccessorFn: (d: MixedObject, i: number, data: MixedObject[]) => Date;
valueAccessorFn = testHistogram.value();

// domain(...) -----------------------------------------------------------------

// test with array
testHistogram = testHistogram.domain([new Date(2014, 3, 15), new Date(2017, 4, 15)]);

// usage with scale domain:
const domain = tScale.domain();

testHistogram = testHistogram.domain([domain[0], domain[domain.length]]);

// testHistogram = testHistogram.domain(tScale.domain()); // fails, as scale domain is an array with possibly more than the two elements expected by histogram

// use with accessor function
testHistogram = testHistogram.domain(values => [values[0], values[values.length]]);

// get current domain accessor function
let domainAccessorFn: (values: Date[]) => [Date, Date];
domainAccessorFn = testHistogram.domain();

// thresholds(...) -------------------------------------------------------------

// with count constant
defaultHistogram = defaultHistogram.thresholds(3);

// with threshold count generator
defaultHistogram = defaultHistogram.thresholds(d3Array.thresholdScott);

// with thresholds value array

testHistogram = testHistogram.thresholds([new Date(2015, 11, 15), new Date(2016, 6, 1), new Date(2016, 8, 30)]);

// with thresholds value array accessors
testHistogram = testHistogram.thresholds((values: Date[], min: Date, max: Date) => {
    let thresholds: Date[];
    thresholds = [values[0], values[2], values[4]];
    return thresholds;
});

testHistogram = testHistogram.thresholds(tScale.ticks(timeYear));

// Use histogram generator =====================================================

numbersArray = [-1, 0, 1, 1, 3, 20, 234];

let defaultBins: Array<d3Array.Bin<number, number>>;
defaultBins = defaultHistogram(numbersArray);

let defaultBin: d3Array.Bin<number, number>;
defaultBin = defaultBins[0];

num = defaultBin.length; // defaultBin is array
num = defaultBin[0]; // with element type number
num = defaultBin.x0; // bin lower bound is number
num = defaultBin.x1; // bin upper bound is number

let testBins: Array<d3Array.Bin<MixedObject, Date>>;
testBins = testHistogram(mixedObjectArray);
testBins = testHistogram(readonlyMixedObjectArray);

let testBin: d3Array.Bin<MixedObject, Date>;
testBin = testBins[0];

num = testBin.length; // defaultBin is array
const mixedObject: MixedObject = testBin[0]; // with element type MixedObject
date = testBin.x0; // bin lower bound is Date
date = testBin.x1; // bin upper bound is Date

// Histogram Tresholds =========================================================

numbersArray = [-1, 0, 1, 1, 3, 20, 234];
typedArray = new Uint8Array(numbersArray);
readonlyNumbersArray = numbersArray as ReadonlyArray<number>;

num = d3Array.thresholdFreedmanDiaconis(numbersArray, -1, 234);
num = d3Array.thresholdFreedmanDiaconis(typedArray, -1, 234);
num = d3Array.thresholdFreedmanDiaconis(readonlyNumbersArray, -1, 234);

num = d3Array.thresholdScott(numbersArray, -1, 234);
num = d3Array.thresholdScott(typedArray, -1, 234);
num = d3Array.thresholdScott(readonlyNumbersArray, -1, 234);

num = d3Array.thresholdSturges(numbersArray);
num = d3Array.thresholdSturges(typedArray);
num = d3Array.thresholdSturges(readonlyNumbersArray);