import { describe, it, expect, beforeEach, afterEach } from "vitest";
import { LessonEngine } from "../../src/impl/LessonEngine.js";
import { PathManager } from "../../src/impl/PathManager.js";

describe("LessonEngine + PathManager Integration", () => {
	let lessonEngine;
	let pathManager;
	let mockModules;
	let mockPaths;

	beforeEach(() => {
		// Clear localStorage before each test
		localStorage.clear();

		// Create mock modules
		mockModules = [
			{
				id: "module-1",
				title: "Module 1",
				mode: "css",
				lessons: [
					{
						id: "lesson-1-1",
						title: "Lesson 1.1",
						task: "Test task 1",
						initialCode: "",
						validations: [{ type: "contains", value: "color: red" }]
					},
					{
						id: "lesson-1-2",
						title: "Lesson 1.2",
						task: "Test task 2",
						initialCode: "",
						validations: [{ type: "contains", value: "color: blue" }]
					}
				]
			},
			{
				id: "module-2",
				title: "Module 2",
				mode: "css",
				lessons: [
					{
						id: "lesson-2-1",
						title: "Lesson 2.1",
						task: "Test task 3",
						initialCode: "",
						validations: [{ type: "contains", value: "color: green" }]
					},
					{
						id: "lesson-2-2",
						title: "Lesson 2.2",
						task: "Test task 4",
						initialCode: "",
						validations: [{ type: "contains", value: "color: yellow" }]
					}
				]
			},
			{
				id: "module-3",
				title: "Module 3",
				mode: "css",
				lessons: [
					{
						id: "lesson-3-1",
						title: "Lesson 3.1",
						task: "Test task 5",
						initialCode: "",
						validations: [{ type: "contains", value: "color: orange" }]
					}
				]
			}
		];

		// Create mock paths
		mockPaths = [
			{
				id: "path-1",
				title: "Test Path 1",
				goal: "Learn basics",
				estimatedTime: 60,
				difficulty: "beginner",
				modules: mockModules // Path includes all modules
			},
			{
				id: "path-2",
				title: "Test Path 2",
				goal: "Advanced concepts",
				estimatedTime: 90,
				difficulty: "intermediate",
				modules: [mockModules[1], mockModules[2]] // Only modules 2 and 3
			}
		];

		// Initialize LessonEngine and PathManager
		lessonEngine = new LessonEngine();
		lessonEngine.setModules(mockModules);

		pathManager = new PathManager();
		pathManager.setPaths(mockPaths);

		// Connect PathManager to LessonEngine
		lessonEngine.setPathManager(pathManager);
	});

	afterEach(() => {
		localStorage.clear();
	});

	describe("setPathManager()", () => {
		it("should set the PathManager instance", () => {
			const engine = new LessonEngine();
			const pm = new PathManager();

			expect(engine.pathManager).toBeNull();
			engine.setPathManager(pm);
			expect(engine.pathManager).toBe(pm);
		});
	});

	describe("nextLesson() with no active path", () => {
		it("should follow normal module order when no path is active", () => {
			lessonEngine.setModule(mockModules[0]);
			lessonEngine.setLessonByIndex(0);

			expect(lessonEngine.currentLessonIndex).toBe(0);
			expect(lessonEngine.currentModule.id).toBe("module-1");

			// Move to next lesson in same module
			lessonEngine.nextLesson();
			expect(lessonEngine.currentLessonIndex).toBe(1);
			expect(lessonEngine.currentModule.id).toBe("module-1");

			// Move to next module's first lesson
			lessonEngine.nextLesson();
			expect(lessonEngine.currentLessonIndex).toBe(0);
			expect(lessonEngine.currentModule.id).toBe("module-2");
		});
	});

	describe("nextLesson() with active path", () => {
		it("should follow path order when path is active", () => {
			// Start path-2 which includes only module-2 and module-3
			pathManager.startPath("path-2");

			// Start at first lesson of path (module-2, lesson 0)
			const firstLesson = pathManager.getNextLesson("path-2");
			expect(firstLesson).toEqual({ moduleId: "module-2", lessonIndex: 0 });

			lessonEngine.setModuleById(firstLesson.moduleId);
			lessonEngine.setLessonByIndex(firstLesson.lessonIndex);

			expect(lessonEngine.currentModule.id).toBe("module-2");
			expect(lessonEngine.currentLessonIndex).toBe(0);

			// Mark first lesson complete
			pathManager.markLessonCompleted("module-2", 0);

			// Next lesson should be module-2, lesson 1
			lessonEngine.nextLesson();
			expect(lessonEngine.currentModule.id).toBe("module-2");
			expect(lessonEngine.currentLessonIndex).toBe(1);
		});

		it("should navigate across modules within the path", () => {
			pathManager.startPath("path-2");

			// Start at module-2, lesson 0
			lessonEngine.setModuleById("module-2");
			lessonEngine.setLessonByIndex(0);

			// Complete both lessons in module-2
			pathManager.markLessonCompleted("module-2", 0);
			pathManager.markLessonCompleted("module-2", 1);

			// Next lesson should jump to module-3 (skipping module-1 which isn't in path)
			lessonEngine.nextLesson();
			expect(lessonEngine.currentModule.id).toBe("module-3");
			expect(lessonEngine.currentLessonIndex).toBe(0);
		});

		it("should return false when path is complete", () => {
			pathManager.startPath("path-2");

			// Complete all lessons in path-2
			pathManager.markLessonCompleted("module-2", 0);
			pathManager.markLessonCompleted("module-2", 1);
			pathManager.markLessonCompleted("module-3", 0);

			// Set to last lesson
			lessonEngine.setModuleById("module-3");
			lessonEngine.setLessonByIndex(0);

			// Should return false as there's no next lesson in the path
			const result = lessonEngine.nextLesson();
			expect(result).toBe(false);
		});
	});

	describe("validateCode() with active path", () => {
		it("should mark lesson complete in both LessonEngine and PathManager", () => {
			pathManager.startPath("path-1");

			lessonEngine.setModule(mockModules[0]);
			lessonEngine.setLessonByIndex(0);

			// Lesson should not be completed initially
			expect(lessonEngine.isCurrentLessonCompleted()).toBe(false);
			expect(pathManager.isLessonCompleted("module-1", 0)).toBe(false);

			// Apply valid code
			lessonEngine.applyUserCode("color: red");
			const result = lessonEngine.validateCode();

			expect(result.isValid).toBe(true);

			// Both should mark it as completed
			expect(lessonEngine.isCurrentLessonCompleted()).toBe(true);
			expect(pathManager.isLessonCompleted("module-1", 0)).toBe(true);
		});

		it("should not mark lesson complete in PathManager if validation fails", () => {
			pathManager.startPath("path-1");

			lessonEngine.setModule(mockModules[0]);
			lessonEngine.setLessonByIndex(0);

			// Apply invalid code
			lessonEngine.applyUserCode("color: wrong");
			const result = lessonEngine.validateCode();

			expect(result.isValid).toBe(false);

			// Neither should mark it as completed
			expect(lessonEngine.isCurrentLessonCompleted()).toBe(false);
			expect(pathManager.isLessonCompleted("module-1", 0)).toBe(false);
		});

		it("should work normally without active path", () => {
			// No path started
			lessonEngine.setModule(mockModules[0]);
			lessonEngine.setLessonByIndex(0);

			lessonEngine.applyUserCode("color: red");
			const result = lessonEngine.validateCode();

			expect(result.isValid).toBe(true);

			// Only LessonEngine should track completion
			expect(lessonEngine.isCurrentLessonCompleted()).toBe(true);
			// PathManager doesn't track without active path
			expect(pathManager.isLessonCompleted("module-1", 0)).toBe(false);
		});
	});

	describe("Path-aware navigation workflow", () => {
		it("should guide user through complete path workflow", () => {
			// Start a path
			pathManager.startPath("path-2");
			expect(pathManager.getActivePath().id).toBe("path-2");

			// Get first lesson and navigate to it
			const firstLesson = pathManager.getNextLesson("path-2");
			lessonEngine.setModuleById(firstLesson.moduleId);
			lessonEngine.setLessonByIndex(firstLesson.lessonIndex);

			expect(lessonEngine.currentModule.id).toBe("module-2");
			expect(lessonEngine.currentLessonIndex).toBe(0);

			// Complete first lesson
			lessonEngine.applyUserCode("color: green");
			lessonEngine.validateCode();

			// Navigate to next lesson using path order
			lessonEngine.nextLesson();
			expect(lessonEngine.currentModule.id).toBe("module-2");
			expect(lessonEngine.currentLessonIndex).toBe(1);

			// Complete second lesson
			lessonEngine.applyUserCode("color: yellow");
			lessonEngine.validateCode();

			// Navigate to next lesson (should cross to module-3)
			lessonEngine.nextLesson();
			expect(lessonEngine.currentModule.id).toBe("module-3");
			expect(lessonEngine.currentLessonIndex).toBe(0);

			// Complete final lesson
			lessonEngine.applyUserCode("color: orange");
			lessonEngine.validateCode();

			// Check path completion
			expect(pathManager.isPathComplete("path-2")).toBe(true);

			// No more lessons
			const result = lessonEngine.nextLesson();
			expect(result).toBe(false);
		});
	});

	describe("PathManager integration without setting PathManager", () => {
		it("should work normally when PathManager is not set", () => {
			const engine = new LessonEngine();
			engine.setModules(mockModules);

			expect(engine.pathManager).toBeNull();

			// Should navigate normally
			engine.setModule(mockModules[0]);
			engine.setLessonByIndex(0);

			engine.nextLesson();
			expect(engine.currentModule.id).toBe("module-1");
			expect(engine.currentLessonIndex).toBe(1);

			// Validation should work
			engine.applyUserCode("color: blue");
			const result = engine.validateCode();
			expect(result.isValid).toBe(true);
		});
	});
});