import { enhancePrompt } from "../enhance-prompt"
import { ApiConfiguration } from "../../shared/api"
import { buildApiHandler, SingleCompletionHandler } from "../../api"
import { defaultPrompts } from "../../shared/modes"

// Mock the API handler
jest.mock("../../api", () => ({
	buildApiHandler: jest.fn(),
}))

describe("enhancePrompt", () => {
	const mockApiConfig: ApiConfiguration = {
		apiProvider: "openai",
		openAiApiKey: "test-key",
		openAiBaseUrl: "https://api.openai.com/v1",
	}

	beforeEach(() => {
		jest.clearAllMocks()

		// Mock the API handler with a completePrompt method
		;(buildApiHandler as jest.Mock).mockReturnValue({
			completePrompt: jest.fn().mockResolvedValue("Enhanced prompt"),
			createMessage: jest.fn(),
			getModel: jest.fn().mockReturnValue({
				id: "test-model",
				info: {
					maxTokens: 4096,
					contextWindow: 8192,
					supportsPromptCache: false,
				},
			}),
		} as unknown as SingleCompletionHandler)
	})

	it("enhances prompt using default enhancement prompt when no custom prompt provided", async () => {
		const result = await enhancePrompt(mockApiConfig, "Test prompt")

		expect(result).toBe("Enhanced prompt")
		const handler = buildApiHandler(mockApiConfig)
		expect((handler as any).completePrompt).toHaveBeenCalledWith(`${defaultPrompts.enhance}\n\nTest prompt`)
	})

	it("enhances prompt using custom enhancement prompt when provided", async () => {
		const customEnhancePrompt = "You are a custom prompt enhancer"

		const result = await enhancePrompt(mockApiConfig, "Test prompt", customEnhancePrompt)

		expect(result).toBe("Enhanced prompt")
		const handler = buildApiHandler(mockApiConfig)
		expect((handler as any).completePrompt).toHaveBeenCalledWith(`${customEnhancePrompt}\n\nTest prompt`)
	})

	it("throws error for empty prompt input", async () => {
		await expect(enhancePrompt(mockApiConfig, "")).rejects.toThrow("No prompt text provided")
	})

	it("throws error for missing API configuration", async () => {
		await expect(enhancePrompt({} as ApiConfiguration, "Test prompt")).rejects.toThrow(
			"No valid API configuration provided",
		)
	})

	it("throws error for API provider that does not support prompt enhancement", async () => {
		;(buildApiHandler as jest.Mock).mockReturnValue({
			// No completePrompt method
			createMessage: jest.fn(),
			getModel: jest.fn().mockReturnValue({
				id: "test-model",
				info: {
					maxTokens: 4096,
					contextWindow: 8192,
					supportsPromptCache: false,
				},
			}),
		})

		await expect(enhancePrompt(mockApiConfig, "Test prompt")).rejects.toThrow(
			"The selected API provider does not support prompt enhancement",
		)
	})

	it("uses appropriate model based on provider", async () => {
		const openRouterConfig: ApiConfiguration = {
			apiProvider: "openrouter",
			openRouterApiKey: "test-key",
			openRouterModelId: "test-model",
		}

		// Mock successful enhancement
		;(buildApiHandler as jest.Mock).mockReturnValue({
			completePrompt: jest.fn().mockResolvedValue("Enhanced prompt"),
			createMessage: jest.fn(),
			getModel: jest.fn().mockReturnValue({
				id: "test-model",
				info: {
					maxTokens: 4096,
					contextWindow: 8192,
					supportsPromptCache: false,
				},
			}),
		} as unknown as SingleCompletionHandler)

		const result = await enhancePrompt(openRouterConfig, "Test prompt")

		expect(buildApiHandler).toHaveBeenCalledWith(openRouterConfig)
		expect(result).toBe("Enhanced prompt")
	})

	it("propagates API errors", async () => {
		;(buildApiHandler as jest.Mock).mockReturnValue({
			completePrompt: jest.fn().mockRejectedValue(new Error("API Error")),
			createMessage: jest.fn(),
			getModel: jest.fn().mockReturnValue({
				id: "test-model",
				info: {
					maxTokens: 4096,
					contextWindow: 8192,
					supportsPromptCache: false,
				},
			}),
		} as unknown as SingleCompletionHandler)

		await expect(enhancePrompt(mockApiConfig, "Test prompt")).rejects.toThrow("API Error")
	})
})