import 'mocha';
import { expect } from 'chai';
import { IReadOnlyFunctionParameterCollection } from '@/application/Parser/Script/Compiler/Function/Parameter/IFunctionParameterCollection';
import { FunctionParameterCollectionStub } from '@tests/unit/stubs/FunctionParameterCollectionStub';
import { createCallerFunction, createFunctionWithInlineCode } from '@/application/Parser/Script/Compiler/Function/SharedFunction';
import { IFunctionCall } from '@/application/Parser/Script/Compiler/Function/Call/IFunctionCall';
import { FunctionCallStub } from '@tests/unit/stubs/FunctionCallStub';
import { FunctionBodyType } from '@/application/Parser/Script/Compiler/Function/ISharedFunction';
import { ISharedFunction } from '@/application/Parser/Script/Compiler/Function/ISharedFunction';

describe('SharedFunction', () => {
    describe('name', () => {
        runForEachFactoryMethod((build) => {
            it('sets as expected', () => {
                // arrange
                const expected = 'expected-function-name';
                const builder = new SharedFunctionBuilder()
                    .withName(expected);
                // act
                const sut = build(builder);
                // assert
                expect(sut.name).equal(expected);
            });
            it('throws if empty or undefined', () => {
                // arrange
                const expectedError = 'undefined function name';
                const invalidValues = [ undefined, '' ];
                for (const invalidValue of invalidValues) {
                    const builder = new SharedFunctionBuilder()
                        .withName(invalidValue);
                    // act
                    const act = () => build(builder);
                    // assert
                    expect(act).to.throw(expectedError);
                }
            });
        });
    });
    describe('parameters', () => {
        runForEachFactoryMethod((build) => {
            it('sets as expected', () => {
                // arrange
                const expected = new FunctionParameterCollectionStub()
                    .withParameterName('test-parameter');
                const builder = new SharedFunctionBuilder()
                    .withParameters(expected);
                // act
                const sut = build(builder);
                // assert
                expect(sut.parameters).equal(expected);
            });
            it('throws if undefined', () => {
                // arrange
                const expectedError = 'undefined parameters';
                const parameters = undefined;
                const builder = new SharedFunctionBuilder()
                    .withParameters(parameters);
                // act
                const act = () => build(builder);
                // assert
                expect(act).to.throw(expectedError);
            });
        });
    });
    describe('body', () => {
        describe('createFunctionWithInlineCode', () => {
            describe('code', () => {
                it('sets as expected', () => {
                    // arrange
                    const expected = 'expected-code';
                    // act
                    const sut = new SharedFunctionBuilder()
                        .withCode(expected)
                        .createFunctionWithInlineCode();
                    // assert
                    expect(sut.body.code.do).equal(expected);
                });
                it('throws if empty or undefined', () => {
                    // arrange
                    const functionName = 'expected-function-name';
                    const expectedError = `undefined code in function "${functionName}"`;
                    const invalidValues = [ undefined, '' ];
                    for (const invalidValue of invalidValues) {
                        // act
                        const act = () => new SharedFunctionBuilder()
                            .withName(functionName)
                            .withCode(invalidValue)
                            .createFunctionWithInlineCode();
                        // assert
                        expect(act).to.throw(expectedError);
                    }
                });
            });
            describe('revertCode', () => {
                it('sets as expected', () => {
                    // arrange
                    const testData = [ 'expected-revert-code', undefined, '' ];
                    for (const data of testData) {
                        // act
                        const sut = new SharedFunctionBuilder()
                            .withRevertCode(data)
                            .createFunctionWithInlineCode();
                        // assert
                        expect(sut.body.code.revert).equal(data);
                    }
                });
            });
            it('sets type as expected', () => {
                // arrange
                const expectedType = FunctionBodyType.Code;
                // act
                const sut = new SharedFunctionBuilder()
                    .createFunctionWithInlineCode();
                // assert
                expect(sut.body.type).equal(expectedType);
            });
            it('calls are undefined', () => {
                // arrange
                const expectedCalls = undefined;
                // act
                const sut = new SharedFunctionBuilder()
                    .createFunctionWithInlineCode();
                // assert
                expect(sut.body.calls).equal(expectedCalls);
            });
        });
        describe('createCallerFunction', () => {
            describe('callSequence', () => {
                it('sets as expected', () => {
                    // arrange
                    const expected = [
                        new FunctionCallStub().withFunctionName('firstFunction'),
                        new FunctionCallStub().withFunctionName('secondFunction'),
                    ];
                    // act
                    const sut = new SharedFunctionBuilder()
                        .withCallSequence(expected)
                        .createCallerFunction();
                    // assert
                    expect(sut.body.calls).equal(expected);
                });
                it('throws if undefined', () => {
                    // arrange
                    const functionName = 'invalidFunction';
                    const callSequence = undefined;
                    const expectedError = `undefined call sequence in function "${functionName}"`;
                    // act
                    const act = () => new SharedFunctionBuilder()
                        .withName(functionName)
                        .withCallSequence(callSequence)
                        .createCallerFunction();
                    // assert
                    expect(act).to.throw(expectedError);
                });
                it('throws if empty', () => {
                    // arrange
                    const functionName = 'invalidFunction';
                    const callSequence = [ ];
                    const expectedError = `empty call sequence in function "${functionName}"`;
                    // act
                    const act = () => new SharedFunctionBuilder()
                        .withName(functionName)
                        .withCallSequence(callSequence)
                        .createCallerFunction();
                    // assert
                    expect(act).to.throw(expectedError);
                });
            });
            it('sets type as expected', () => {
                // arrange
                const expectedType = FunctionBodyType.Calls;
                // act
                const sut = new SharedFunctionBuilder()
                    .createCallerFunction();
                // assert
                expect(sut.body.type).equal(expectedType);
            });
            it('code is undefined', () => {
                // arrange
                const expectedCode = undefined;
                // act
                const sut = new SharedFunctionBuilder()
                    .createCallerFunction();
                // assert
                expect(sut.body.code).equal(expectedCode);
            });
        });
    });
});

function runForEachFactoryMethod(
    act: (action: (sut: SharedFunctionBuilder) => ISharedFunction) => void): void {
    describe('createCallerFunction', () => {
        const action = (builder: SharedFunctionBuilder) => builder.createCallerFunction();
        act(action);
    });
    describe('createFunctionWithInlineCode', () => {
        const action = (builder: SharedFunctionBuilder) => builder.createFunctionWithInlineCode();
        act(action);
    });
}

/*
    Using an abstraction here allows for easy refactorings in
    parameters or moving between functional and object-oriented
    solutions without refactorings all tests.
*/
class SharedFunctionBuilder {
    private name = 'name';
    private parameters: IReadOnlyFunctionParameterCollection = new FunctionParameterCollectionStub();
    private callSequence: readonly IFunctionCall[] = [ new FunctionCallStub() ];
    private code = 'code';
    private revertCode = 'revert-code';

    public createCallerFunction(): ISharedFunction {
        return createCallerFunction(
            this.name,
            this.parameters,
            this.callSequence,
        );
    }
    public createFunctionWithInlineCode(): ISharedFunction {
        return createFunctionWithInlineCode(
            this.name,
            this.parameters,
            this.code,
            this.revertCode,
        );
    }

    public withName(name: string) {
        this.name = name;
        return this;
    }
    public withParameters(parameters: IReadOnlyFunctionParameterCollection) {
        this.parameters = parameters;
        return this;
    }
    public withCode(code: string) {
        this.code = code;
        return this;
    }
    public withRevertCode(revertCode: string) {
        this.revertCode = revertCode;
        return this;
    }
    public withCallSequence(callSequence: readonly IFunctionCall[]) {
        this.callSequence = callSequence;
        return this;
    }
}