namespace Harness {
    export type TestRunnerKind = CompilerTestKind | FourslashTestKind | "project" | "rwc" | "test262" | "user" | "dt" | "docker";
    export type CompilerTestKind = "conformance" | "compiler" | "compiler-oh";
    export type FourslashTestKind = "fourslash" | "fourslash-shims" | "fourslash-shims-pp" | "fourslash-server" | "fourslash-oh";

    /* eslint-disable prefer-const */
    export let shards = 1;
    export let shardId = 1;
    /* eslint-enable prefer-const */

    // The following have setters as while they're read here in the harness, they're only set in the runner
    export function setShards(count: number) {
        shards = count;
    }
    export function setShardId(id: number) {
        shardId = id;
    }

    export abstract class RunnerBase {
        // contains the tests to run
        public tests: (string | FileBasedTest)[] = [];

        /** Add a source file to the runner's list of tests that need to be initialized with initializeTests */
        public addTest(fileName: string) {
            this.tests.push(fileName);
        }

        public enumerateFiles(folder: string, regex?: RegExp, options?: { recursive: boolean }): string[] {
            return ts.map(IO.listFiles(userSpecifiedRoot + folder, regex, { recursive: (options ? options.recursive : false) }), ts.normalizeSlashes);
        }

        abstract kind(): TestRunnerKind;

        abstract enumerateTestFiles(): (string | FileBasedTest)[];

        getTestFiles(): ReturnType<this["enumerateTestFiles"]> {
            const all = this.enumerateTestFiles();
            if (shards === 1) {
                return all as ReturnType<this["enumerateTestFiles"]>;
            }
            return all.filter((_val, idx) => idx % shards === (shardId - 1)) as ReturnType<this["enumerateTestFiles"]>;
        }

        /** The working directory where tests are found. Needed for batch testing where the input path will differ from the output path inside baselines */
        public workingDirectory = "";

        /** Setup the runner's tests so that they are ready to be executed by the harness
         *  The first test should be a describe/it block that sets up the harness's compiler instance appropriately
         */
        public abstract initializeTests(): void;

        /** Replaces instances of full paths with fileNames only */
        static removeFullPaths(path: string) {
            // If its a full path (starts with "C:" or "/") replace with just the filename
            let fixedPath = /^(\w:|\/)/.test(path) ? ts.getBaseFileName(path) : path;

            // when running in the browser the 'full path' is the host name, shows up in error baselines
            const localHost = /http:\/localhost:\d+/g;
            fixedPath = fixedPath.replace(localHost, "");
            return fixedPath;
        }
    }
}