import {expect} from 'chai';
import * as ts from 'typescript';
import {MutableSourceCode} from '../src/mutable-source-code';
import {defaultCompilerOptions} from '../src/configuration';
import {FastAppendAction, FastRewriteAction, ReplaceAction, InsertAction} from '../src/mutable-source-code';

function aSourceMapperFor(source: string): MutableSourceCode {
    const ast = ts.createSourceFile('test.ts', source, defaultCompilerOptions.target, true);
    return new MutableSourceCode(ast);
}

describe('Mutable source actions performs', function() {
    it('FastAppendAction at the end of source', () => {
        const source = `const someCode = 'Some string';`;
        const mutableCode = aSourceMapperFor(source);
        mutableCode.execute([new FastAppendAction('const b = 666;')]);
        expect(mutableCode.code).to.equal(`const someCode = 'Some string';const b = 666;`);
    });

    it('FastRewriteAction', function() {
        const source = `const someCode = 'Some string';`;
        //              0123456789012345678901234567890
        //                        1         2         3
        const mutableCode = aSourceMapperFor(source);
        mutableCode.execute([new FastRewriteAction(18, 'XXXXXXXXXXX')]);
        expect(mutableCode.code).to.equal(`const someCode = 'XXXXXXXXXXX';`);
    });

    it('ReplaceAction - replace style', function() {
        const source = `const someCode = 'Some string';`;
        //              0123456789012345678901234567890
        //                        1         2         3
        const mutableCode = aSourceMapperFor(source);
        mutableCode.execute([new ReplaceAction(6, 30, 'b = 666')]);
        expect(mutableCode.code).to.equal('const b = 666;');
    });

    it('InsertAction', function() {
        const source = `const someCode = 'Some string';`;
        //              0123456789012345678901234567890
        //                        1         2         3
        const mutableCode = aSourceMapperFor(source);
        mutableCode.execute([new InsertAction(6, '__')]);
        expect(mutableCode.code).to.equal(`const __someCode = 'Some string';`);
    });

    it('InsertAction (beginning)', function() {
        const source = `const someCode = 'Some string';`;
        //              0123456789012345678901234567890
        //                        1         2         3
        const mutableCode = aSourceMapperFor(source);
        mutableCode.execute([new InsertAction(0, '__')]);
        expect(mutableCode.code).to.equal(`__const someCode = 'Some string';`);
    });

    it('several actions in sequence', function() {
        const source = `const someCode = 'Some string';`;
        //              0123456789012345678901234567890
        //                        1         2         3
        const mutableCode = aSourceMapperFor(source);
        mutableCode.execute([
            new ReplaceAction(6, 6, '__'),
            new FastAppendAction('const b = 666;'),
            new FastRewriteAction(18, 'XXXXXXXXXXX')
        ]);
        expect(mutableCode.code).to.equal(`const __someCode = 'XXXXXXXXXXX';const b = 666;`);
    })
});