import type { Model } from "@mariozechner/pi-ai";
import { calculateTool, getModel } from "@mariozechner/pi-ai";
import { describe, expect, it } from "vitest";
import { Agent, ProviderTransport } from "../src/index.js";

async function basicPrompt(model: Model<any>) {
	const agent = new Agent({
		initialState: {
			systemPrompt: "You are a helpful assistant. Keep your responses concise.",
			model,
			thinkingLevel: "off",
			tools: [],
		},
		transport: new ProviderTransport({
			getApiKey: async (provider) => {
				// Map provider names to env var names
				const envVarMap: Record<string, string> = {
					google: "GEMINI_API_KEY",
					openai: "OPENAI_API_KEY",
					anthropic: "ANTHROPIC_API_KEY",
					xai: "XAI_API_KEY",
					groq: "GROQ_API_KEY",
					cerebras: "CEREBRAS_API_KEY",
					zai: "ZAI_API_KEY",
				};
				const envVar = envVarMap[provider] || `${provider.toUpperCase()}_API_KEY`;
				return process.env[envVar];
			},
		}),
	});

	await agent.prompt("What is 2+2? Answer with just the number.");

	expect(agent.state.isStreaming).toBe(false);
	expect(agent.state.messages.length).toBe(2);
	expect(agent.state.messages[0].role).toBe("user");
	expect(agent.state.messages[1].role).toBe("assistant");

	const assistantMessage = agent.state.messages[1];
	if (assistantMessage.role !== "assistant") throw new Error("Expected assistant message");
	expect(assistantMessage.content.length).toBeGreaterThan(0);

	const textContent = assistantMessage.content.find((c) => c.type === "text");
	expect(textContent).toBeDefined();
	if (textContent?.type !== "text") throw new Error("Expected text content");
	expect(textContent.text).toContain("4");
}

async function toolExecution(model: Model<any>) {
	const agent = new Agent({
		initialState: {
			systemPrompt: "You are a helpful assistant. Always use the calculator tool for math.",
			model,
			thinkingLevel: "off",
			tools: [calculateTool],
		},
		transport: new ProviderTransport({
			getApiKey: async (provider) => {
				// Map provider names to env var names
				const envVarMap: Record<string, string> = {
					google: "GEMINI_API_KEY",
					openai: "OPENAI_API_KEY",
					anthropic: "ANTHROPIC_API_KEY",
					xai: "XAI_API_KEY",
					groq: "GROQ_API_KEY",
					cerebras: "CEREBRAS_API_KEY",
					zai: "ZAI_API_KEY",
				};
				const envVar = envVarMap[provider] || `${provider.toUpperCase()}_API_KEY`;
				return process.env[envVar];
			},
		}),
	});

	await agent.prompt("Calculate 123 * 456 using the calculator tool.");

	expect(agent.state.isStreaming).toBe(false);
	expect(agent.state.messages.length).toBeGreaterThanOrEqual(3);

	const toolResultMsg = agent.state.messages.find((m) => m.role === "toolResult");
	expect(toolResultMsg).toBeDefined();
	if (toolResultMsg?.role !== "toolResult") throw new Error("Expected tool result message");
	const textContent =
		toolResultMsg.content
			?.filter((c) => c.type === "text")
			.map((c: any) => c.text)
			.join("\n") || "";
	expect(textContent).toBeDefined();

	const expectedResult = 123 * 456;
	expect(textContent).toContain(String(expectedResult));

	const finalMessage = agent.state.messages[agent.state.messages.length - 1];
	if (finalMessage.role !== "assistant") throw new Error("Expected final assistant message");
	const finalText = finalMessage.content.find((c) => c.type === "text");
	expect(finalText).toBeDefined();
	if (finalText?.type !== "text") throw new Error("Expected text content");
	// Check for number with or without comma formatting
	const hasNumber =
		finalText.text.includes(String(expectedResult)) ||
		finalText.text.includes("56,088") ||
		finalText.text.includes("56088");
	expect(hasNumber).toBe(true);
}

async function abortExecution(model: Model<any>) {
	const agent = new Agent({
		initialState: {
			systemPrompt: "You are a helpful assistant.",
			model,
			thinkingLevel: "off",
			tools: [calculateTool],
		},
		transport: new ProviderTransport({
			getApiKey: async (provider) => {
				// Map provider names to env var names
				const envVarMap: Record<string, string> = {
					google: "GEMINI_API_KEY",
					openai: "OPENAI_API_KEY",
					anthropic: "ANTHROPIC_API_KEY",
					xai: "XAI_API_KEY",
					groq: "GROQ_API_KEY",
					cerebras: "CEREBRAS_API_KEY",
					zai: "ZAI_API_KEY",
				};
				const envVar = envVarMap[provider] || `${provider.toUpperCase()}_API_KEY`;
				return process.env[envVar];
			},
		}),
	});

	const promptPromise = agent.prompt("Calculate 100 * 200, then 300 * 400, then sum the results.");

	setTimeout(() => {
		agent.abort();
	}, 100);

	await promptPromise;

	expect(agent.state.isStreaming).toBe(false);
	expect(agent.state.messages.length).toBeGreaterThanOrEqual(2);

	const lastMessage = agent.state.messages[agent.state.messages.length - 1];
	if (lastMessage.role !== "assistant") throw new Error("Expected assistant message");
	expect(lastMessage.stopReason).toBe("aborted");
	expect(lastMessage.errorMessage).toBeDefined();
	expect(agent.state.error).toBeDefined();
	expect(agent.state.error).toBe(lastMessage.errorMessage);
}

async function stateUpdates(model: Model<any>) {
	const agent = new Agent({
		initialState: {
			systemPrompt: "You are a helpful assistant.",
			model,
			thinkingLevel: "off",
			tools: [],
		},
		transport: new ProviderTransport({
			getApiKey: async (provider) => {
				// Map provider names to env var names
				const envVarMap: Record<string, string> = {
					google: "GEMINI_API_KEY",
					openai: "OPENAI_API_KEY",
					anthropic: "ANTHROPIC_API_KEY",
					xai: "XAI_API_KEY",
					groq: "GROQ_API_KEY",
					cerebras: "CEREBRAS_API_KEY",
					zai: "ZAI_API_KEY",
				};
				const envVar = envVarMap[provider] || `${provider.toUpperCase()}_API_KEY`;
				return process.env[envVar];
			},
		}),
	});

	const events: Array<string> = [];

	agent.subscribe((event) => {
		events.push(event.type);
	});

	await agent.prompt("Count from 1 to 5.");

	// Should have received lifecycle events
	expect(events).toContain("agent_start");
	expect(events).toContain("agent_end");
	expect(events).toContain("message_start");
	expect(events).toContain("message_end");
	// May have message_update events during streaming
	const hasMessageUpdates = events.some((e) => e === "message_update");
	expect(hasMessageUpdates).toBe(true);

	// Check final state
	expect(agent.state.isStreaming).toBe(false);
	expect(agent.state.messages.length).toBe(2); // User message + assistant response
}

async function multiTurnConversation(model: Model<any>) {
	const agent = new Agent({
		initialState: {
			systemPrompt: "You are a helpful assistant.",
			model,
			thinkingLevel: "off",
			tools: [],
		},
		transport: new ProviderTransport({
			getApiKey: async (provider) => {
				// Map provider names to env var names
				const envVarMap: Record<string, string> = {
					google: "GEMINI_API_KEY",
					openai: "OPENAI_API_KEY",
					anthropic: "ANTHROPIC_API_KEY",
					xai: "XAI_API_KEY",
					groq: "GROQ_API_KEY",
					cerebras: "CEREBRAS_API_KEY",
					zai: "ZAI_API_KEY",
				};
				const envVar = envVarMap[provider] || `${provider.toUpperCase()}_API_KEY`;
				return process.env[envVar];
			},
		}),
	});

	await agent.prompt("My name is Alice.");
	expect(agent.state.messages.length).toBe(2);

	await agent.prompt("What is my name?");
	expect(agent.state.messages.length).toBe(4);

	const lastMessage = agent.state.messages[3];
	if (lastMessage.role !== "assistant") throw new Error("Expected assistant message");
	const lastText = lastMessage.content.find((c) => c.type === "text");
	if (lastText?.type !== "text") throw new Error("Expected text content");
	expect(lastText.text.toLowerCase()).toContain("alice");
}

describe("Agent E2E Tests", () => {
	describe.skipIf(!process.env.GEMINI_API_KEY)("Google Provider (gemini-2.5-flash)", () => {
		const model = getModel("google", "gemini-2.5-flash");

		it("should handle basic text prompt", async () => {
			await basicPrompt(model);
		});

		it("should execute tools correctly", async () => {
			await toolExecution(model);
		});

		it("should handle abort during execution", async () => {
			await abortExecution(model);
		});

		it("should emit state updates during streaming", async () => {
			await stateUpdates(model);
		});

		it("should maintain context across multiple turns", async () => {
			await multiTurnConversation(model);
		});
	});

	describe.skipIf(!process.env.OPENAI_API_KEY)("OpenAI Provider (gpt-4o-mini)", () => {
		const model = getModel("openai", "gpt-4o-mini");

		it("should handle basic text prompt", async () => {
			await basicPrompt(model);
		});

		it("should execute tools correctly", async () => {
			await toolExecution(model);
		});

		it("should handle abort during execution", async () => {
			await abortExecution(model);
		});

		it("should emit state updates during streaming", async () => {
			await stateUpdates(model);
		});

		it("should maintain context across multiple turns", async () => {
			await multiTurnConversation(model);
		});
	});

	describe.skipIf(!process.env.ANTHROPIC_API_KEY)("Anthropic Provider (claude-3-5-haiku-20241022)", () => {
		const model = getModel("anthropic", "claude-3-5-haiku-20241022");

		it("should handle basic text prompt", async () => {
			await basicPrompt(model);
		});

		it("should execute tools correctly", async () => {
			await toolExecution(model);
		});

		it("should handle abort during execution", async () => {
			await abortExecution(model);
		});

		it("should emit state updates during streaming", async () => {
			await stateUpdates(model);
		});

		it("should maintain context across multiple turns", async () => {
			await multiTurnConversation(model);
		});
	});

	describe.skipIf(!process.env.XAI_API_KEY)("xAI Provider (grok-3)", () => {
		const model = getModel("xai", "grok-3");

		it("should handle basic text prompt", async () => {
			await basicPrompt(model);
		});

		it("should execute tools correctly", async () => {
			await toolExecution(model);
		});

		it("should handle abort during execution", async () => {
			await abortExecution(model);
		});

		it("should emit state updates during streaming", async () => {
			await stateUpdates(model);
		});

		it("should maintain context across multiple turns", async () => {
			await multiTurnConversation(model);
		});
	});

	describe.skipIf(!process.env.GROQ_API_KEY)("Groq Provider (openai/gpt-oss-20b)", () => {
		const model = getModel("groq", "openai/gpt-oss-20b");

		it("should handle basic text prompt", async () => {
			await basicPrompt(model);
		});

		it("should execute tools correctly", async () => {
			await toolExecution(model);
		});

		it("should handle abort during execution", async () => {
			await abortExecution(model);
		});

		it("should emit state updates during streaming", async () => {
			await stateUpdates(model);
		});

		it("should maintain context across multiple turns", async () => {
			await multiTurnConversation(model);
		});
	});

	describe.skipIf(!process.env.CEREBRAS_API_KEY)("Cerebras Provider (gpt-oss-120b)", () => {
		const model = getModel("cerebras", "gpt-oss-120b");

		it("should handle basic text prompt", async () => {
			await basicPrompt(model);
		});

		it("should execute tools correctly", async () => {
			await toolExecution(model);
		});

		it("should handle abort during execution", async () => {
			await abortExecution(model);
		});

		it("should emit state updates during streaming", async () => {
			await stateUpdates(model);
		});

		it("should maintain context across multiple turns", async () => {
			await multiTurnConversation(model);
		});
	});

	describe.skipIf(!process.env.ZAI_API_KEY)("zAI Provider (glm-4.5-air)", () => {
		const model = getModel("zai", "glm-4.5-air");

		it("should handle basic text prompt", async () => {
			await basicPrompt(model);
		});

		it("should execute tools correctly", async () => {
			await toolExecution(model);
		});

		it("should handle abort during execution", async () => {
			await abortExecution(model);
		});

		it("should emit state updates during streaming", async () => {
			await stateUpdates(model);
		});

		it("should maintain context across multiple turns", async () => {
			await multiTurnConversation(model);
		});
	});
});