import {assert} from "chai";
import * as MockFs from "mock-fs";

import * as TestUtilities from "./testUtilities";

import * as FileTree from "./fileTree";
import {Directory, Location} from "./utilities";

describe("fileTree module has a", () => {
    describe("buildTree function that", () => {
        let result: Directory;
        let logged: string[];
        beforeEach(() => {
            MockFs(TestUtilities.mockFsConfiguration());
            logged = [];
            const logger = (message: string) => logged.push(message);
            result = FileTree.buildTree(
                "./directory1",
                {
                    barrelName: "barrel.ts",
                    logger,
                    quoteCharacter: "\"",
                    rootPath: "some/path",
                },
            );
        });
        afterEach(() => {
            MockFs.restore();
        });
        it("should build a tree structure matching the file system directories", () => {
            // Check the current directory.
            assert.equal(result.path, "./directory1");
            assert.equal(result.name, "directory1");

            // Check for a child.
            assert.lengthOf(result.directories, 2);
            const subDirectory = result.directories[0];

            // Check the child directory.
            assert.equal(subDirectory.path, "directory1/directory2");
            assert.equal(subDirectory.name, "directory2");
        });
        it("should enumerate each file in a directory", () => {
            assert.lengthOf(result.files, 3);
            const testFile = (name: string) => {
                const files = result.files.filter((file) => file.name === name);
                assert.lengthOf(files, 1);
                const firstFile = files[0];
                assert.equal(firstFile.path, `directory1/${name}`);
                assert.equal(firstFile.name, name);
            };
            testFile("index.ts");
            testFile("barrel.ts");
            testFile("ignore.txt");
        });
        it("should identify existing barrels in a directory", () => {
            assert.isNotNull(result.barrel);

            const barrel = result.barrel as Location;

            // Test the barrel.
            assert.equal(barrel.name, "barrel.ts");
            assert.equal(barrel.path, "directory1/barrel.ts");

            // Test it is in the files list.
            assert.notEqual(result.files.indexOf(barrel), -1);

            // Check for a child.
            assert.lengthOf(result.directories, 2);
            const subDirectory = result.directories[0];

            // Child shouldn't have a barrel.
            assert.isUndefined(subDirectory.barrel);
        });
        it("should log useful information to the logger", () => {
            assert.sameMembers(
                logged,
                [
                    "Building directory tree for ./directory1",
                    "Found existing barrel @ directory1/barrel.ts",
                    "Building directory tree for directory1/directory2",
                    "Building directory tree for directory1/directory2/directory4",
                    "Building directory tree for directory1/directory3",
                ],
            );
        });
    });
    describe("walkTree function that", () => {
        it("should should call the callback once for each directory in the tree", () => {
            const fakeTree: Directory = TestUtilities.mockDirectoryTree();

            // Build a collection all all directories.
            let allDirectories: Directory[] = [fakeTree];
            fakeTree.directories.forEach((directory) => {
                // Child/grandchild directories.
                allDirectories = allDirectories.concat([directory]).concat(directory.directories);
            });

            const calledDirectories: Directory[] = [];
            const callback = (directory: Directory) => calledDirectories.push(directory);

            FileTree.walkTree(fakeTree, callback);

            assert.deepEqual(allDirectories, calledDirectories);
        });
    });
});