import {
    create,
    factory,
    all,
    MathJsFunctionName,
    fractionDependencies,
    addDependencies,
    divideDependencies,
    formatDependencies,
} from 'mathjs';
/*
Basic usage examples
*/
{
    const math = create(all, {});

    // functions and constants
    math.round(math.e, 3);
    math.atan2(3, -3) / math.pi;
    math.log(10000, 10);
    math.sqrt(-4);
    math.pow([[-1, 2], [3, 1]], 2);
    const angle = 0.2;
    math.add(math.pow(math.sin(angle), 2), math.pow(math.cos(angle), 2));

    // expressions
    math.evaluate('1.2 * (2 + 4.5)');

    // chained operations
    const a = math
        .chain(3)
        .add(4)
        .multiply(2)
        .done(); // 14

    // mixed use of different data types in functions
    math.add(4, [5, 6]); // number + Array, [9, 10]
    math.multiply(math.unit('5 mm'), 3); // Unit * number,  15 mm
    math.subtract([2, 3, 4], 5); // Array - number, [-3, -2, -1]
    math.add(math.matrix([2, 3]), [4, 5]); // Matrix + Array, [6, 8]
}

/*
Bignumbers examples
*/
{
    // configure the default type of numbers as BigNumbers
    const math = create(all, {
        number: 'BigNumber',
        precision: 20,
    });

    {
        math.add(math.bignumber(0.1), math.bignumber(0.2)); // BigNumber, 0.3
        math.divide(math.bignumber(0.3), math.bignumber(0.2)); // BigNumber, 1.5
    }
}

/*
Chaining examples
*/
{
    const math = create(all, {});
    const a = math
        .chain(3)
        .add(4)
        .multiply(2)
        .done(); // 14

    // Another example, calculate square(sin(pi / 4))
    const b = math
        .chain(math.pi)
        .divide(4)
        .sin()
        .square()
        .done();

    // toString will return a string representation of the chain's value
    const chain = math.chain(2).divide(3);
    const str: string = chain.toString(); // "0.6666666666666666"

    chain.valueOf();

    // the function subset can be used to get or replace sub matrices
    const array = [[1, 2], [3, 4]];
    const v = math
        .chain(array)
        .subset(math.index(1, 0))
        .done(); // 3

    const m = math
        .chain(array)
        .subset(math.index(0, 0), 8)
        .multiply(3)
        .done();
}

/*
Complex numbers examples
*/
{
    const math = create(all, {});
    const a = math.complex(2, 3);
    // create a complex number by providing a string with real and complex parts
    const b = math.complex('3 - 7i');

    // read the real and complex parts of the complex number
    {
        const x: number = a.re;
        const y: number = a.im;

        // adjust the complex value
        a.re = 5;
    }

    // clone a complex value
    {
        const clone = a.clone();
    }

    // perform operations with complex numbers
    {
        math.add(a, b);
        math.multiply(a, b);
        math.sin(a);
    }

    // create a complex number from polar coordinates
    {
        const p: math.PolarCoordinates = { r: math.sqrt(2), phi: math.pi / 4 };
        const c: math.Complex = math.complex(p);
    }

    // get polar coordinates of a complex number
    {
        const p: math.PolarCoordinates = math.complex(3, 4).toPolar();
    }
}

/*
Expressions examples
*/
{
    const math = create(all, {});
    // evaluate expressions
    {
        math.evaluate('sqrt(3^2 + 4^2)');
    }

    // evaluate multiple expressions at once
    {
        math.evaluate(['f = 3', 'g = 4', 'f * g']);
    }

    // scope can contain both variables and functions
    {
        const scope = { hello: (name: string) => `hello, ${name}!` };
        math.evaluate('hello("hero")', scope); // "hello, hero!"
    }

    // define a function as an expression
    {
        const scope: any = {
            a: 3,
            b: 4,
        };
        const f = math.evaluate('f(x) = x ^ a', scope);
        f(2);
        scope.f(2);
    }

    {
        const node2 = math.parse('x^a');
        const code2: math.EvalFunction = node2.compile();
        node2.toString();
    }

    // 3. using function math.compile
    // parse an expression
    {
        // provide a scope for the variable assignment
        const code2 = math.compile('a = a + 3');
        const scope = { a: 7 };
        code2.evaluate(scope);
    }
    // 4. using a parser
    const parser = math.parser();

    // get and set variables and functions
    {
        parser.evaluate('x = 7 / 2'); // 3.5
        parser.evaluate('x + 3'); // 6.5
        parser.evaluate('f(x, y) = x^y'); // f(x, y)
        parser.evaluate('f(2, 3)'); // 8

        const x = parser.get('x');
        const f = parser.get('f');
        const y = parser.getAll();
        const g = f(3, 3);

        parser.set('h', 500);
        parser.set('hello', (name: string) => `hello, ${name}!`);
    }

    // clear defined functions and variables
    parser.clear();
}

/*
Fractions examples
*/
{
    // configure the default type of numbers as Fractions
    const math = create(all, {
        number: 'Fraction',
    });

    const x = math.fraction(0.125);
    const y = math.fraction('1/3');
    math.fraction(2, 3);

    math.add(x, y);
    math.divide(x, y);

    // output formatting
    const a = math.fraction('2/3');
}

/*
Matrices examples
*/
{
    const math = create(all, {});

    // create matrices and arrays. a matrix is just a wrapper around an Array,
    // providing some handy utilities.
    const a: math.Matrix = math.matrix([1, 4, 9, 16, 25]);
    const b: math.Matrix = math.matrix(math.ones([2, 3]));
    b.size();

    // the Array data of a Matrix can be retrieved using valueOf()
    const array = a.valueOf();

    // Matrices can be cloned
    const clone: math.Matrix = a.clone();

    // perform operations with matrices
    math.sqrt(a);
    math.factorial(a);

    // create and manipulate matrices. Arrays and Matrices can be used mixed.
    {
        const a = [[1, 2], [3, 4]];
        const b: math.Matrix = math.matrix([[5, 6], [1, 1]]);

        b.subset(math.index(1, [0, 1]), [[7, 8]]);
        const c = math.multiply(a, b);
        const f: math.Matrix = math.matrix([1, 0]);
        const d: math.Matrix = f.subset(math.index(1, 0));
    }

    // get a sub matrix
    {
        const a: math.Matrix = math.diag(math.range(1, 4));
        a.subset(math.index([1, 2], [1, 2]));
        const b: math.Matrix = math.range(1, 6);
        b.subset(math.index(math.range(1, 4)));
    }

    // resize a multi dimensional matrix
    {
        const a = math.matrix();
        a.resize([2, 2, 2], 0);
        a.size();
        a.resize([2, 2]);
        a.size();
    }

    // can set a subset of a matrix to uninitialized
    {
        const m = math.matrix();
        m.subset(math.index(2), 6, math.uninitialized);
    }

    // create ranges
    {
        math.range(1, 6);
        math.range(0, 18, 3);
        math.range('2:-1:-3');
        math.factorial(math.range('1:6'));
    }

    // map matrix
    {
        math.map([1, 2, 3], function(value) {
            return value * value;
        }); // returns [1, 4, 9]
    }

    // filter matrix
    {
        math.filter([6, -2, -1, 4, 3], function(x) {
            return x > 0;
        }); // returns [6, 4, 3]
        math.filter(['23', 'foo', '100', '55', 'bar'], /[0-9]+/); // returns ["23", "100", "55"]
    }
}

/*
Sparse matrices examples
*/
{
    const math = create(all, {});

    // create a sparse matrix
    const a = math.identity(1000, 1000, 'sparse');

    // do operations with a sparse matrix
    const b = math.multiply(a, a);
    const c = math.multiply(b, math.complex(2, 2));
    const d = math.matrix([0, 1]);
    const e = math.transpose(d);
    const f = math.multiply(e, a);
}

/*
Units examples
*/
{
    const math = create(all, {});

    // units can be created by providing a value and unit name, or by providing
    // a string with a valued unit.
    const a = math.unit(45, 'cm'); // 450 mm
    const b = math.unit('0.1m'); // 100 mm

    // creating units
    math.createUnit('foo');
    math.createUnit('furlong', '220 yards');
    math.createUnit('furlong', '220 yards', { override: true });
    math.createUnit('testunit', { definition: '0.555556 kelvin', offset: 459.67 });
    math.createUnit('testunit', { definition: '0.555556 kelvin', offset: 459.67 }, { override: true });
    math.createUnit('knot', { definition: '0.514444 m/s', aliases: ['knots', 'kt', 'kts'] });
    math.createUnit('knot', { definition: '0.514444 m/s', aliases: ['knots', 'kt', 'kts'] }, { override: true });
    math.createUnit(
        'knot',
        {
            definition: '0.514444 m/s',
            aliases: ['knots', 'kt', 'kts'],
            prefixes: 'long',
        },
        { override: true }
    );
    math.createUnit(
        {
            foo_2: {
                prefixes: 'long',
            },
            bar: '40 foo',
            baz: {
                definition: '1 bar/hour',
                prefixes: 'long',
            },
        },
        {
            override: true,
        }
    );
    // use Unit as definition
    math.createUnit('c', { definition: b });
    math.createUnit('c', { definition: b }, { override: true });

    // units can be added, subtracted, and multiplied or divided by numbers and by other units
    math.add(a, b);
    math.multiply(b, 2);
    math.divide(math.unit('1 m'), math.unit('1 s'));
    math.pow(math.unit('12 in'), 3);

    // units can be converted to a specific type, or to a number
    b.to('cm');
    math.to(b, 'inch');
    b.toNumber('cm');
    math.number(b, 'cm');

    // the expression parser supports units too
    math.evaluate('2 inch to cm');

    // units can be converted to SI
    math.unit('1 inch').toSI();

    // units can be split into other units
    math.unit('1 m').splitUnit(['ft', 'in']);
}

/*
Expression tree examples
*/
{
    const math = create(all, {});

    // Filter an expression tree
    const node: math.MathNode = math.parse('x^2 + x/4 + 3*y');
    const filtered: math.MathNode[] = node.filter((node: math.MathNode) => node.isSymbolNode && node.name === 'x');

    const arr: string[] = filtered.map((node: math.MathNode) => node.toString());

    // Traverse an expression tree
    const node1: math.MathNode = math.parse('3 * x + 2');
    node1.traverse((node: math.MathNode, path: string, parent: math.MathNode) => {
        switch (node.type) {
            case 'OperatorNode':
                return node.type === 'OperatorNode';
            case 'ConstantNode':
                return node.type === 'ConstantNode';
            case 'SymbolNode':
                return node.type === 'SymbolNode';
            default:
                return node.type === 'any string at all';
        }
    });
}

/*
JSON serialization/deserialization
*/
{
    const math = create(all, {});

    const data = {
        bigNumber: math.bignumber('1.5'),
    };
    const stringified = JSON.stringify(data);
    const parsed = JSON.parse(stringified, math.json.reviver);
    parsed.bigNumber === math.bignumber('1.5'); // true
}

/*
Extend functionality with import
 */

declare module 'mathjs' {
    interface MathJsStatic {
        testFun(): number;
        value: number;
    }
}

{
    const math = create(all, {});
    const testFun = () => 5;

    math.import(
        {
            testFun,
            value: 10,
        },
        {}
    );

    math.testFun();

    const a = math.value * 2;
}

/*
Renamed functions from v5 => v6
 */
{
    const math = create(all, {});
    math.typeOf(1);
    math.variance([1, 2, 3, 4]);
    math.evaluate('1 + 2');

    // chained operations
    math.chain(3)
        .typeOf()
        .done();
    math.chain([1, 2, 3])
        .variance()
        .done();
    math.chain('1 + 2')
        .evaluate()
        .done();
}

/*
Factory Test
 */
{
    // create a factory function
    const name = 'negativeSquare';
    const dependencies: MathJsFunctionName[] = ['multiply', 'unaryMinus'];
    const createNegativeSquare = factory(name, dependencies, injected => {
        const { multiply, unaryMinus } = injected;
        return function negativeSquare(x: number): number {
            return unaryMinus(multiply(x, x));
        };
    });

    // create an instance of the function yourself:
    const multiply = (a: number, b: number) => a * b;
    const unaryMinus = (a: number) => -a;
    const negativeSquare = createNegativeSquare({ multiply, unaryMinus });
    negativeSquare(3);
}

/**
 * Dependency map typing test from mathjs official document:
 * https://mathjs.org/docs/custom_bundling.html#using-just-a-few-functions
 */
{
    const config = {
        // optionally, you can specify configuration
    };

    // Create just the functions we need
    const { fraction, add, divide, format } = create(
        {
            fractionDependencies,
            addDependencies,
            divideDependencies,
            formatDependencies,
        },
        config
    );

    // Use the created functions
    const a = fraction(1, 3);
    const b = fraction(3, 7);
    const c = add(a, b);
    const d = divide(a, b);
    console.log('c =', format(c)); // outputs "c = 16/21"
    console.log('d =', format(d)); // outputs "d = 7/9"
}