namespace ts.projectSystem {
    describe("unittests:: tsserver:: Inferred projects", () => {
        it("create inferred project", () => {
            const appFile: File = {
                path: `${tscWatch.projectRoot}/app.ts`,
                content: `
                import {f} from "./module"
                console.log(f)
                `
            };

            const moduleFile: File = {
                path: `${tscWatch.projectRoot}/module.d.ts`,
                content: `export let x: number`
            };
            const host = createServerHost([appFile, moduleFile, libFile]);
            const projectService = createProjectService(host);
            const { configFileName } = projectService.openClientFile(appFile.path);

            assert(!configFileName, `should not find config, got: '${configFileName}`);
            checkNumberOfConfiguredProjects(projectService, 0);
            checkNumberOfInferredProjects(projectService, 1);

            const project = projectService.inferredProjects[0];

            checkArray("inferred project", project.getFileNames(), [appFile.path, libFile.path, moduleFile.path]);
            checkWatchedFiles(host, getConfigFilesToWatch(tscWatch.projectRoot).concat(libFile.path, moduleFile.path));
            checkWatchedDirectories(host, [tscWatch.projectRoot], /*recursive*/ false);
            checkWatchedDirectories(host, [combinePaths(tscWatch.projectRoot, nodeModulesAtTypes)], /*recursive*/ true);
        });

        it("should use only one inferred project if 'useOneInferredProject' is set", () => {
            const file1 = {
                path: `${tscWatch.projectRoot}/a/b/main.ts`,
                content: "let x =1;"
            };
            const configFile: File = {
                path: `${tscWatch.projectRoot}/a/b/tsconfig.json`,
                content: `{
                    "compilerOptions": {
                        "target": "es6"
                    },
                    "files": [ "main.ts" ]
                }`
            };
            const file2 = {
                path: `${tscWatch.projectRoot}/a/c/main.ts`,
                content: "let x =1;"
            };

            const file3 = {
                path: `${tscWatch.projectRoot}/a/d/main.ts`,
                content: "let x =1;"
            };

            const host = createServerHost([file1, file2, file3, libFile]);
            const projectService = createProjectService(host, { useSingleInferredProject: true });
            projectService.openClientFile(file1.path);
            projectService.openClientFile(file2.path);
            projectService.openClientFile(file3.path);

            checkNumberOfConfiguredProjects(projectService, 0);
            checkNumberOfInferredProjects(projectService, 1);
            checkProjectActualFiles(projectService.inferredProjects[0], [file1.path, file2.path, file3.path, libFile.path]);


            host.writeFile(configFile.path, configFile.content);
            host.checkTimeoutQueueLengthAndRun(2); // load configured project from disk + ensureProjectsForOpenFiles
            checkNumberOfConfiguredProjects(projectService, 1);
            checkNumberOfInferredProjects(projectService, 1);
            checkProjectActualFiles(projectService.inferredProjects[0], [file2.path, file3.path, libFile.path]);
        });

        it("disable inferred project", () => {
            const file1 = {
                path: "/a/b/f1.ts",
                content: "let x =1;"
            };

            const host = createServerHost([file1]);
            const projectService = createProjectService(host, { useSingleInferredProject: true }, { syntaxOnly: true });

            projectService.openClientFile(file1.path, file1.content);

            checkNumberOfProjects(projectService, { inferredProjects: 1 });
            const proj = projectService.inferredProjects[0];
            assert.isDefined(proj);

            assert.isFalse(proj.languageServiceEnabled);
        });

        it("project settings for inferred projects", () => {
            const file1 = {
                path: "/a/b/app.ts",
                content: `import {x} from "mod"`
            };
            const modFile = {
                path: "/a/mod.ts",
                content: "export let x: number"
            };
            const host = createServerHost([file1, modFile]);
            const projectService = createProjectService(host);

            projectService.openClientFile(file1.path);
            projectService.openClientFile(modFile.path);

            checkNumberOfProjects(projectService, { inferredProjects: 2 });
            const inferredProjects = projectService.inferredProjects.slice();
            checkProjectActualFiles(inferredProjects[0], [file1.path]);
            checkProjectActualFiles(inferredProjects[1], [modFile.path]);

            projectService.setCompilerOptionsForInferredProjects({ moduleResolution: ModuleResolutionKind.Classic });
            host.checkTimeoutQueueLengthAndRun(3);
            checkNumberOfProjects(projectService, { inferredProjects: 2 });
            assert.strictEqual(projectService.inferredProjects[0], inferredProjects[0]);
            assert.strictEqual(projectService.inferredProjects[1], inferredProjects[1]);
            checkProjectActualFiles(inferredProjects[0], [file1.path, modFile.path]);
            assert.isTrue(inferredProjects[1].isOrphan());
        });

        it("should support files without extensions", () => {
            const f = {
                path: "/a/compile",
                content: "let x = 1"
            };
            const host = createServerHost([f]);
            const session = createSession(host);
            session.executeCommand(<server.protocol.SetCompilerOptionsForInferredProjectsRequest>{
                seq: 1,
                type: "request",
                command: "compilerOptionsForInferredProjects",
                arguments: {
                    options: {
                        allowJs: true
                    }
                }
            });
            session.executeCommand(<server.protocol.OpenRequest>{
                seq: 2,
                type: "request",
                command: "open",
                arguments: {
                    file: f.path,
                    fileContent: f.content,
                    scriptKindName: "JS"
                }
            });
            const projectService = session.getProjectService();
            checkNumberOfProjects(projectService, { inferredProjects: 1 });
            checkProjectActualFiles(projectService.inferredProjects[0], [f.path]);
        });

        it("inferred projects per project root", () => {
            const file1 = { path: "/a/file1.ts", content: "let x = 1;", projectRootPath: "/a" };
            const file2 = { path: "/a/file2.ts", content: "let y = 2;", projectRootPath: "/a" };
            const file3 = { path: "/b/file2.ts", content: "let x = 3;", projectRootPath: "/b" };
            const file4 = { path: "/c/file3.ts", content: "let z = 4;" };
            const host = createServerHost([file1, file2, file3, file4]);
            const session = createSession(host, {
                useSingleInferredProject: true,
                useInferredProjectPerProjectRoot: true
            });
            session.executeCommand(<server.protocol.SetCompilerOptionsForInferredProjectsRequest>{
                seq: 1,
                type: "request",
                command: CommandNames.CompilerOptionsForInferredProjects,
                arguments: {
                    options: {
                        allowJs: true,
                        target: ScriptTarget.ESNext
                    }
                }
            });
            session.executeCommand(<server.protocol.SetCompilerOptionsForInferredProjectsRequest>{
                seq: 2,
                type: "request",
                command: CommandNames.CompilerOptionsForInferredProjects,
                arguments: {
                    options: {
                        allowJs: true,
                        target: ScriptTarget.ES2015
                    },
                    projectRootPath: "/b"
                }
            });
            session.executeCommand(<server.protocol.OpenRequest>{
                seq: 3,
                type: "request",
                command: CommandNames.Open,
                arguments: {
                    file: file1.path,
                    fileContent: file1.content,
                    scriptKindName: "JS",
                    projectRootPath: file1.projectRootPath
                }
            });
            session.executeCommand(<server.protocol.OpenRequest>{
                seq: 4,
                type: "request",
                command: CommandNames.Open,
                arguments: {
                    file: file2.path,
                    fileContent: file2.content,
                    scriptKindName: "JS",
                    projectRootPath: file2.projectRootPath
                }
            });
            session.executeCommand(<server.protocol.OpenRequest>{
                seq: 5,
                type: "request",
                command: CommandNames.Open,
                arguments: {
                    file: file3.path,
                    fileContent: file3.content,
                    scriptKindName: "JS",
                    projectRootPath: file3.projectRootPath
                }
            });
            session.executeCommand(<server.protocol.OpenRequest>{
                seq: 6,
                type: "request",
                command: CommandNames.Open,
                arguments: {
                    file: file4.path,
                    fileContent: file4.content,
                    scriptKindName: "JS"
                }
            });

            const projectService = session.getProjectService();
            checkNumberOfProjects(projectService, { inferredProjects: 3 });
            checkProjectActualFiles(projectService.inferredProjects[0], [file4.path]);
            checkProjectActualFiles(projectService.inferredProjects[1], [file1.path, file2.path]);
            checkProjectActualFiles(projectService.inferredProjects[2], [file3.path]);
            assert.equal(projectService.inferredProjects[0].getCompilationSettings().target, ScriptTarget.ESNext);
            assert.equal(projectService.inferredProjects[1].getCompilationSettings().target, ScriptTarget.ESNext);
            assert.equal(projectService.inferredProjects[2].getCompilationSettings().target, ScriptTarget.ES2015);
        });

        function checkInferredProject(inferredProject: server.InferredProject, actualFiles: File[], target: ScriptTarget) {
            checkProjectActualFiles(inferredProject, actualFiles.map(f => f.path));
            assert.equal(inferredProject.getCompilationSettings().target, target);
        }

        function verifyProjectRootWithCaseSensitivity(useCaseSensitiveFileNames: boolean) {
            const files: [File, File, File, File] = [
                { path: "/a/file1.ts", content: "let x = 1;" },
                { path: "/A/file2.ts", content: "let y = 2;" },
                { path: "/b/file2.ts", content: "let x = 3;" },
                { path: "/c/file3.ts", content: "let z = 4;" }
            ];
            const host = createServerHost(files, { useCaseSensitiveFileNames });
            const projectService = createProjectService(host, { useSingleInferredProject: true, }, { useInferredProjectPerProjectRoot: true });
            projectService.setCompilerOptionsForInferredProjects({
                allowJs: true,
                target: ScriptTarget.ESNext
            });
            projectService.setCompilerOptionsForInferredProjects({
                allowJs: true,
                target: ScriptTarget.ES2015
            }, "/a");

            openClientFiles(["/a", "/a", "/b", undefined]);
            verifyInferredProjectsState([
                [[files[3]], ScriptTarget.ESNext],
                [[files[0], files[1]], ScriptTarget.ES2015],
                [[files[2]], ScriptTarget.ESNext]
            ]);
            closeClientFiles();

            openClientFiles(["/a", "/A", "/b", undefined]);
            if (useCaseSensitiveFileNames) {
                verifyInferredProjectsState([
                    [[files[3]], ScriptTarget.ESNext],
                    [[files[0]], ScriptTarget.ES2015],
                    [[files[1]], ScriptTarget.ESNext],
                    [[files[2]], ScriptTarget.ESNext]
                ]);
            }
            else {
                verifyInferredProjectsState([
                    [[files[3]], ScriptTarget.ESNext],
                    [[files[0], files[1]], ScriptTarget.ES2015],
                    [[files[2]], ScriptTarget.ESNext]
                ]);
            }
            closeClientFiles();

            projectService.setCompilerOptionsForInferredProjects({
                allowJs: true,
                target: ScriptTarget.ES2017
            }, "/A");

            openClientFiles(["/a", "/a", "/b", undefined]);
            verifyInferredProjectsState([
                [[files[3]], ScriptTarget.ESNext],
                [[files[0], files[1]], useCaseSensitiveFileNames ? ScriptTarget.ES2015 : ScriptTarget.ES2017],
                [[files[2]], ScriptTarget.ESNext]
            ]);
            closeClientFiles();

            openClientFiles(["/a", "/A", "/b", undefined]);
            if (useCaseSensitiveFileNames) {
                verifyInferredProjectsState([
                    [[files[3]], ScriptTarget.ESNext],
                    [[files[0]], ScriptTarget.ES2015],
                    [[files[1]], ScriptTarget.ES2017],
                    [[files[2]], ScriptTarget.ESNext]
                ]);
            }
            else {
                verifyInferredProjectsState([
                    [[files[3]], ScriptTarget.ESNext],
                    [[files[0], files[1]], ScriptTarget.ES2017],
                    [[files[2]], ScriptTarget.ESNext]
                ]);
            }
            closeClientFiles();

            function openClientFiles(projectRoots: [string | undefined, string | undefined, string | undefined, string | undefined]) {
                files.forEach((file, index) => {
                    projectService.openClientFile(file.path, file.content, ScriptKind.JS, projectRoots[index]);
                });
            }

            function closeClientFiles() {
                files.forEach(file => projectService.closeClientFile(file.path));
            }

            function verifyInferredProjectsState(expected: [File[], ScriptTarget][]) {
                checkNumberOfProjects(projectService, { inferredProjects: expected.length });
                projectService.inferredProjects.forEach((p, index) => {
                    const [actualFiles, target] = expected[index];
                    checkInferredProject(p, actualFiles, target);
                });
            }
        }

        it("inferred projects per project root with case sensitive system", () => {
            verifyProjectRootWithCaseSensitivity(/*useCaseSensitiveFileNames*/ true);
        });

        it("inferred projects per project root with case insensitive system", () => {
            verifyProjectRootWithCaseSensitivity(/*useCaseSensitiveFileNames*/ false);
        });

        it("should still retain configured project created while opening the file", () => {
            const appFile: File = {
                path: `${tscWatch.projectRoot}/app.ts`,
                content: `const app = 20;`
            };
            const config: File = {
                path: `${tscWatch.projectRoot}/tsconfig.json`,
                content: "{}"
            };
            const jsFile1: File = {
                path: `${tscWatch.projectRoot}/jsFile1.js`,
                content: `const jsFile1 = 10;`
            };
            const jsFile2: File = {
                path: `${tscWatch.projectRoot}/jsFile2.js`,
                content: `const jsFile2 = 10;`
            };
            const host = createServerHost([appFile, libFile, config, jsFile1, jsFile2]);
            const projectService = createProjectService(host);
            const originalSet = projectService.configuredProjects.set;
            const originalDelete = projectService.configuredProjects.delete;
            const configuredCreated = new Map<string, true>();
            const configuredRemoved = new Map<string, true>();
            projectService.configuredProjects.set = (key, value) => {
                assert.isFalse(configuredCreated.has(key));
                configuredCreated.set(key, true);
                return originalSet.call(projectService.configuredProjects, key, value);
            };
            projectService.configuredProjects.delete = key => {
                assert.isFalse(configuredRemoved.has(key));
                configuredRemoved.set(key, true);
                return originalDelete.call(projectService.configuredProjects, key);
            };

            // Do not remove config project when opening jsFile that is not present as part of config project
            projectService.openClientFile(jsFile1.path);
            checkNumberOfProjects(projectService, { inferredProjects: 1, configuredProjects: 1 });
            checkProjectActualFiles(projectService.inferredProjects[0], [jsFile1.path, libFile.path]);
            const project = projectService.configuredProjects.get(config.path)!;
            checkProjectActualFiles(project, [appFile.path, config.path, libFile.path]);
            checkConfiguredProjectCreatedAndNotDeleted();

            // Do not remove config project when opening jsFile that is not present as part of config project
            projectService.closeClientFile(jsFile1.path);
            checkNumberOfProjects(projectService, { inferredProjects: 1, configuredProjects: 1 });
            projectService.openClientFile(jsFile2.path);
            checkNumberOfProjects(projectService, { inferredProjects: 1, configuredProjects: 1 });
            checkProjectActualFiles(projectService.inferredProjects[0], [jsFile2.path, libFile.path]);
            checkProjectActualFiles(project, [appFile.path, config.path, libFile.path]);
            checkConfiguredProjectNotCreatedAndNotDeleted();

            // Do not remove config project when opening jsFile that is not present as part of config project
            projectService.openClientFile(jsFile1.path);
            checkNumberOfProjects(projectService, { inferredProjects: 2, configuredProjects: 1 });
            checkProjectActualFiles(projectService.inferredProjects[0], [jsFile2.path, libFile.path]);
            checkProjectActualFiles(projectService.inferredProjects[1], [jsFile1.path, libFile.path]);
            checkProjectActualFiles(project, [appFile.path, config.path, libFile.path]);
            checkConfiguredProjectNotCreatedAndNotDeleted();

            // When opening file that doesnt fall back to the config file, we remove the config project
            projectService.openClientFile(libFile.path);
            checkNumberOfProjects(projectService, { inferredProjects: 2 });
            checkProjectActualFiles(projectService.inferredProjects[0], [jsFile2.path, libFile.path]);
            checkProjectActualFiles(projectService.inferredProjects[1], [jsFile1.path, libFile.path]);
            checkConfiguredProjectNotCreatedButDeleted();

            function checkConfiguredProjectCreatedAndNotDeleted() {
                assert.equal(configuredCreated.size, 1);
                assert.isTrue(configuredCreated.has(config.path));
                assert.equal(configuredRemoved.size, 0);
                configuredCreated.clear();
            }

            function checkConfiguredProjectNotCreatedAndNotDeleted() {
                assert.equal(configuredCreated.size, 0);
                assert.equal(configuredRemoved.size, 0);
            }

            function checkConfiguredProjectNotCreatedButDeleted() {
                assert.equal(configuredCreated.size, 0);
                assert.equal(configuredRemoved.size, 1);
                assert.isTrue(configuredRemoved.has(config.path));
                configuredRemoved.clear();
            }
        });

        it("regression test - should infer typeAcquisition for inferred projects when set undefined", () => {
            const file1 = { path: "/a/file1.js", content: "" };
            const host = createServerHost([file1]);

            const projectService = createProjectService(host);

            projectService.openClientFile(file1.path);

            checkNumberOfProjects(projectService, { inferredProjects: 1 });
            const inferredProject = projectService.inferredProjects[0];
            checkProjectActualFiles(inferredProject, [file1.path]);
            inferredProject.setTypeAcquisition(undefined);

            const expected = {
                enable: true,
                include: [],
                exclude: []
            };
            assert.deepEqual(inferredProject.getTypeAcquisition(), expected, "typeAcquisition should be inferred for inferred projects");
        });
    });
}
