import 'mocha';
import { expect } from 'chai';
import { CodeChangedEvent } from '@/application/Context/State/Code/Event/CodeChangedEvent';
import { SelectedScript } from '@/application/Context/State/Selection/SelectedScript';
import { ICodePosition } from '@/application/Context/State/Code/Position/ICodePosition';
import { CodePosition } from '@/application/Context/State/Code/Position/CodePosition';
import { SelectedScriptStub } from '@tests/unit/stubs/SelectedScriptStub';
import { ScriptStub } from '@tests/unit/stubs/ScriptStub';

describe('CodeChangedEvent', () => {
    describe('ctor', () => {
        describe('position validation', () => {
            it('throws when code position is out of range', () => {
                const act = () => new CodeChangedEvent(
                    'singleline code', [], new Map<SelectedScript, ICodePosition>([
                        [ new SelectedScriptStub('1'), new CodePosition(0, 2) ],
                    ]),
                );
                expect(act).to.throw();
            });
            it('does not throw with valid code position', () => {
                const act = () => new CodeChangedEvent(
                    'singleline code', [], new Map<SelectedScript, ICodePosition>([
                        [ new SelectedScriptStub('1'), new CodePosition(0, 1) ],
                    ]),
                );
                expect(act).to.not.throw();
            });
        });
    });
    it('code returns expected', () => {
        // arrange
        const expected = 'code';
        // act
        const sut = new CodeChangedEvent(
            expected, [], new Map<SelectedScript, ICodePosition>(),
        );
        const actual = sut.code;
        // assert
        expect(actual).to.equal(expected);
    });
    describe('addedScripts', () => {
        it('returns new scripts when scripts are added', () => {
            // arrange
            const expected = [ new ScriptStub('3'), new ScriptStub('4') ];
            const initialScripts = [ new SelectedScriptStub('1'), new SelectedScriptStub('2') ];
            const newScripts = new Map<SelectedScript, ICodePosition>([
                [initialScripts[0], new CodePosition(0, 1) ],
                [initialScripts[1], new CodePosition(0, 1) ],
                [new SelectedScript(expected[0], false), new CodePosition(0, 1) ],
                [new SelectedScript(expected[1], false), new CodePosition(0, 1) ],
            ]);
            // act
            const sut = new CodeChangedEvent(
                'code', initialScripts, newScripts,
            );
            const actual = sut.addedScripts;
            // assert
            expect(actual).to.have.lengthOf(2);
            expect(actual[0]).to.deep.equal(expected[0]);
            expect(actual[1]).to.deep.equal(expected[1]);
        });
    });
    describe('removedScripts', () => {
        it('returns removed scripts when script are removed', () => {
            // arrange
            const existingScripts = [ new SelectedScriptStub('0'), new SelectedScriptStub('1') ];
            const removedScripts = [ new SelectedScriptStub('2') ];
            const initialScripts = [ ...existingScripts, ...removedScripts ];
            const newScripts = new Map<SelectedScript, ICodePosition>([
                [initialScripts[0], new CodePosition(0, 1) ],
                [initialScripts[1], new CodePosition(0, 1) ],
            ]);
            // act
            const sut = new CodeChangedEvent(
                'code', initialScripts, newScripts,
            );
            const actual = sut.removedScripts;
            // assert
            expect(actual).to.have.lengthOf(removedScripts.length);
            expect(actual[0]).to.deep.equal(removedScripts[0].script);
        });
    });
    describe('changedScripts', () => {
        it('returns changed scripts when scripts are changed', () => {
            // arrange
            const initialScripts = [ new SelectedScriptStub('1', false), new SelectedScriptStub('2', false) ];
            const newScripts = new Map<SelectedScript, ICodePosition>([
                [new SelectedScriptStub('1', true), new CodePosition(0, 1) ],
                [new SelectedScriptStub('2', false), new CodePosition(0, 1) ],
            ]);
            // act
            const sut = new CodeChangedEvent(
                'code', initialScripts, newScripts,
            );
            const actual = sut.changedScripts;
            // assert
            expect(actual).to.have.lengthOf(1);
            expect(actual[0]).to.deep.equal(initialScripts[0].script);
        });
    });
    describe('isEmpty', () => {
        it('returns true when empty', () => {
            // arrange
            const newScripts = new Map<SelectedScript, ICodePosition>();
            const oldScripts = [ new SelectedScriptStub('1', false) ];
            const sut = new CodeChangedEvent(
                'code', oldScripts, newScripts,
            );
            // act
            const actual = sut.isEmpty();
            // assert
            expect(actual).to.equal(true);
        });
        it('returns false when not empty', () => {
            // arrange
            const oldScripts = [ new SelectedScriptStub('1') ];
            const newScripts = new Map<SelectedScript, ICodePosition>( [
                [oldScripts[0], new CodePosition(0, 1) ],
            ]);
            const sut = new CodeChangedEvent(
                'code', oldScripts, newScripts,
            );
            // act
            const actual = sut.isEmpty();
            // assert
            expect(actual).to.equal(false);
        });
    });
    describe('getScriptPositionInCode', () => {
        it('returns expected position for existing script', () => {
            // arrange
            const script = new ScriptStub('1');
            const expected = new CodePosition(0, 1);
            const newScripts = new Map<SelectedScript, ICodePosition>( [
                [new SelectedScript(script, false), expected ],
            ]);
            const sut = new CodeChangedEvent(
                'code', [], newScripts,
            );
            // act
            const actual = sut.getScriptPositionInCode(script);
            // assert
            expect(actual).to.deep.equal(expected);
        });
    });
});