// npx vitest run api/providers/__tests__/ollama.spec.ts

import { Anthropic } from "@anthropic-ai/sdk"

import { OllamaHandler } from "../ollama"
import { ApiHandlerOptions } from "../../../shared/api"

const mockCreate = vitest.fn()

vitest.mock("openai", () => {
	return {
		__esModule: true,
		default: vitest.fn().mockImplementation(() => ({
			chat: {
				completions: {
					create: mockCreate.mockImplementation(async (options) => {
						if (!options.stream) {
							return {
								id: "test-completion",
								choices: [
									{
										message: { role: "assistant", content: "Test response" },
										finish_reason: "stop",
										index: 0,
									},
								],
								usage: {
									prompt_tokens: 10,
									completion_tokens: 5,
									total_tokens: 15,
								},
							}
						}

						return {
							[Symbol.asyncIterator]: async function* () {
								yield {
									choices: [
										{
											delta: { content: "Test response" },
											index: 0,
										},
									],
									usage: null,
								}
								yield {
									choices: [
										{
											delta: {},
											index: 0,
										},
									],
									usage: {
										prompt_tokens: 10,
										completion_tokens: 5,
										total_tokens: 15,
									},
								}
							},
						}
					}),
				},
			},
		})),
	}
})

describe("OllamaHandler", () => {
	let handler: OllamaHandler
	let mockOptions: ApiHandlerOptions

	beforeEach(() => {
		mockOptions = {
			apiModelId: "llama2",
			ollamaModelId: "llama2",
			ollamaBaseUrl: "http://localhost:11434/v1",
		}
		handler = new OllamaHandler(mockOptions)
		mockCreate.mockClear()
	})

	describe("constructor", () => {
		it("should initialize with provided options", () => {
			expect(handler).toBeInstanceOf(OllamaHandler)
			expect(handler.getModel().id).toBe(mockOptions.ollamaModelId)
		})

		it("should use default base URL if not provided", () => {
			const handlerWithoutUrl = new OllamaHandler({
				apiModelId: "llama2",
				ollamaModelId: "llama2",
			})
			expect(handlerWithoutUrl).toBeInstanceOf(OllamaHandler)
		})
	})

	describe("createMessage", () => {
		const systemPrompt = "You are a helpful assistant."
		const messages: Anthropic.Messages.MessageParam[] = [
			{
				role: "user",
				content: "Hello!",
			},
		]

		it("should handle streaming responses", async () => {
			const stream = handler.createMessage(systemPrompt, messages)
			const chunks: any[] = []
			for await (const chunk of stream) {
				chunks.push(chunk)
			}

			expect(chunks.length).toBeGreaterThan(0)
			const textChunks = chunks.filter((chunk) => chunk.type === "text")
			expect(textChunks).toHaveLength(1)
			expect(textChunks[0].text).toBe("Test response")
		})

		it("should handle API errors", async () => {
			mockCreate.mockRejectedValueOnce(new Error("API Error"))

			const stream = handler.createMessage(systemPrompt, messages)

			await expect(async () => {
				for await (const _chunk of stream) {
					// Should not reach here
				}
			}).rejects.toThrow("API Error")
		})
	})

	describe("completePrompt", () => {
		it("should complete prompt successfully", async () => {
			const result = await handler.completePrompt("Test prompt")
			expect(result).toBe("Test response")
			expect(mockCreate).toHaveBeenCalledWith({
				model: mockOptions.ollamaModelId,
				messages: [{ role: "user", content: "Test prompt" }],
				temperature: 0,
				stream: false,
			})
		})

		it("should handle API errors", async () => {
			mockCreate.mockRejectedValueOnce(new Error("API Error"))
			await expect(handler.completePrompt("Test prompt")).rejects.toThrow("Ollama completion error: API Error")
		})

		it("should handle empty response", async () => {
			mockCreate.mockResolvedValueOnce({
				choices: [{ message: { content: "" } }],
			})
			const result = await handler.completePrompt("Test prompt")
			expect(result).toBe("")
		})
	})

	describe("getModel", () => {
		it("should return model info", () => {
			const modelInfo = handler.getModel()
			expect(modelInfo.id).toBe(mockOptions.ollamaModelId)
			expect(modelInfo.info).toBeDefined()
			expect(modelInfo.info.maxTokens).toBe(-1)
			expect(modelInfo.info.contextWindow).toBe(128_000)
		})
	})
})
