import { Type } from "@sinclair/typebox";
import { beforeEach, describe, expect, it, vi } from "vitest";
import { getModel } from "../src/models.js";
import { streamSimple } from "../src/stream.js";
import type { Tool } from "../src/types.js";

const mockState = vi.hoisted(() => ({
	lastParams: undefined as unknown,
	chunks: undefined as
		| Array<null | {
				id?: string;
				choices?: Array<{ delta: Record<string, unknown>; finish_reason: string | null; usage?: unknown }>;
				usage?: {
					prompt_tokens: number;
					completion_tokens: number;
					prompt_tokens_details: { cached_tokens: number };
					completion_tokens_details: { reasoning_tokens: number };
				};
		  }>
		| undefined,
}));

vi.mock("openai", () => {
	class FakeOpenAI {
		chat = {
			completions: {
				create: async (params: unknown) => {
					mockState.lastParams = params;
					return {
						async *[Symbol.asyncIterator]() {
							const chunks = mockState.chunks ?? [
								{
									choices: [{ delta: {}, finish_reason: "stop" }],
									usage: {
										prompt_tokens: 1,
										completion_tokens: 1,
										prompt_tokens_details: { cached_tokens: 0 },
										completion_tokens_details: { reasoning_tokens: 0 },
									},
								},
							];
							for (const chunk of chunks) {
								yield chunk;
							}
						},
					};
				},
			},
		};
	}

	return { default: FakeOpenAI };
});

describe("openai-completions tool_choice", () => {
	beforeEach(() => {
		mockState.lastParams = undefined;
		mockState.chunks = undefined;
	});

	it("forwards toolChoice from simple options to payload", async () => {
		const { compat: _compat, ...baseModel } = getModel("openai", "gpt-4o-mini")!;
		const model = { ...baseModel, api: "openai-completions" } as const;
		const tools: Tool[] = [
			{
				name: "ping",
				description: "Ping tool",
				parameters: Type.Object({
					ok: Type.Boolean(),
				}),
			},
		];
		let payload: unknown;

		await streamSimple(
			model,
			{
				messages: [
					{
						role: "user",
						content: "Call ping with ok=true",
						timestamp: Date.now(),
					},
				],
				tools,
			},
			{
				apiKey: "test",
				toolChoice: "required",
				onPayload: (params: unknown) => {
					payload = params;
				},
			} as unknown as Parameters<typeof streamSimple>[2],
		).result();

		const params = (payload ?? mockState.lastParams) as { tool_choice?: string; tools?: unknown[] };
		expect(params.tool_choice).toBe("required");
		expect(Array.isArray(params.tools)).toBe(true);
		expect(params.tools?.length ?? 0).toBeGreaterThan(0);
	});

	it("omits strict when compat disables strict mode", async () => {
		const { compat: _compat, ...baseModel } = getModel("openai", "gpt-4o-mini")!;
		const model = {
			...baseModel,
			api: "openai-completions",
			compat: { supportsStrictMode: false },
		} as const;
		const tools: Tool[] = [
			{
				name: "ping",
				description: "Ping tool",
				parameters: Type.Object({
					ok: Type.Boolean(),
				}),
			},
		];
		let payload: unknown;

		await streamSimple(
			model,
			{
				messages: [
					{
						role: "user",
						content: "Call ping with ok=true",
						timestamp: Date.now(),
					},
				],
				tools,
			},
			{
				apiKey: "test",
				onPayload: (params: unknown) => {
					payload = params;
				},
			} as unknown as Parameters<typeof streamSimple>[2],
		).result();

		const params = (payload ?? mockState.lastParams) as { tools?: Array<{ function?: Record<string, unknown> }> };
		const tool = params.tools?.[0]?.function;
		expect(tool).toBeTruthy();
		expect(tool?.strict).toBeUndefined();
		expect("strict" in (tool ?? {})).toBe(false);
	});

	it("maps groq qwen3 reasoning levels to default reasoning_effort", async () => {
		const model = getModel("groq", "qwen/qwen3-32b")!;
		let payload: unknown;

		await streamSimple(
			model,
			{
				messages: [
					{
						role: "user",
						content: "Hi",
						timestamp: Date.now(),
					},
				],
			},
			{
				apiKey: "test",
				reasoning: "medium",
				onPayload: (params: unknown) => {
					payload = params;
				},
			},
		).result();

		const params = (payload ?? mockState.lastParams) as { reasoning_effort?: string };
		expect(params.reasoning_effort).toBe("default");
	});

	it("keeps normal reasoning_effort for groq models without compat mapping", async () => {
		const model = getModel("groq", "openai/gpt-oss-20b")!;
		let payload: unknown;

		await streamSimple(
			model,
			{
				messages: [
					{
						role: "user",
						content: "Hi",
						timestamp: Date.now(),
					},
				],
			},
			{
				apiKey: "test",
				reasoning: "medium",
				onPayload: (params: unknown) => {
					payload = params;
				},
			},
		).result();

		const params = (payload ?? mockState.lastParams) as { reasoning_effort?: string };
		expect(params.reasoning_effort).toBe("medium");
	});

	it("maps non-standard provider finish_reason values to stopReason error", async () => {
		mockState.chunks = [
			{
				choices: [{ delta: { content: "partial" }, finish_reason: null }],
			},
			{
				choices: [{ delta: {}, finish_reason: "network_error" }],
				usage: {
					prompt_tokens: 1,
					completion_tokens: 1,
					prompt_tokens_details: { cached_tokens: 0 },
					completion_tokens_details: { reasoning_tokens: 0 },
				},
			},
		];

		const model = getModel("zai", "glm-5")!;
		const response = await streamSimple(
			model,
			{
				messages: [
					{
						role: "user",
						content: "Hi",
						timestamp: Date.now(),
					},
				],
			},
			{ apiKey: "test" },
		).result();

		expect(response.stopReason).toBe("error");
		expect(response.errorMessage).toBe("Provider finish_reason: network_error");
	});

	it("ignores null stream chunks from openai-compatible providers", async () => {
		mockState.chunks = [
			null,
			{
				id: "chatcmpl-test",
				choices: [{ delta: { content: "OK" }, finish_reason: null }],
			},
			{
				id: "chatcmpl-test",
				choices: [{ delta: {}, finish_reason: "stop" }],
				usage: {
					prompt_tokens: 3,
					completion_tokens: 1,
					prompt_tokens_details: { cached_tokens: 0 },
					completion_tokens_details: { reasoning_tokens: 0 },
				},
			},
		];

		const { compat: _compat, ...baseModel } = getModel("openai", "gpt-4o-mini")!;
		const model = { ...baseModel, api: "openai-completions" } as const;
		const response = await streamSimple(
			model,
			{
				messages: [
					{
						role: "user",
						content: "Reply with exactly OK",
						timestamp: Date.now(),
					},
				],
			},
			{ apiKey: "test" },
		).result();

		expect(response.stopReason).toBe("stop");
		expect(response.errorMessage).toBeUndefined();
		expect(response.responseId).toBe("chatcmpl-test");
		expect(response.usage.totalTokens).toBe(4);
		expect(response.content).toEqual([{ type: "text", text: "OK" }]);
	});

	it("uses OpenRouter reasoning object instead of reasoning_effort", async () => {
		const model = getModel("openrouter", "deepseek/deepseek-r1")!;
		let payload: unknown;

		await streamSimple(
			model,
			{
				messages: [
					{
						role: "user",
						content: "Hi",
						timestamp: Date.now(),
					},
				],
			},
			{
				apiKey: "test",
				reasoning: "high",
				onPayload: (params: unknown) => {
					payload = params;
				},
			},
		).result();

		const params = (payload ?? mockState.lastParams) as {
			reasoning?: { effort?: string };
			reasoning_effort?: string;
		};
		expect(params.reasoning).toEqual({ effort: "high" });
		expect(params.reasoning_effort).toBeUndefined();
	});
});
