import { afterEach, beforeEach, describe, expect, it } from "bun:test";
import * as fs from "node:fs/promises";
import * as os from "node:os";
import * as path from "node:path";
import { create } from "@bufbuild/protobuf";
import type { AgentEvent, AgentTool, AgentToolContext } from "@oh-my-pi/pi-agent-core";
import { ReadArgsSchema, ShellArgsSchema } from "@oh-my-pi/pi-catalog/discovery/cursor-gen/agent_pb";
import { Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
import { CursorExecHandlers } from "@oh-my-pi/pi-coding-agent/cursor";
import type { ExtensionRunner } from "@oh-my-pi/pi-coding-agent/extensibility/extensions";
import { ExtensionToolWrapper } from "@oh-my-pi/pi-coding-agent/extensibility/extensions";
import { GrepTool, type ToolSession } from "@oh-my-pi/pi-coding-agent/tools";
import { removeWithRetries } from "@oh-my-pi/pi-utils";
import { type } from "arktype";

function createTestSession(cwd: string, overrides: Partial<ToolSession> = {}): ToolSession {
	return {
		cwd,
		hasUI: false,
		getSessionFile: () => null,
		getSessionSpawns: () => "*",
		settings: Settings.isolated(),
		...overrides,
	};
}

describe("CursorExecHandlers.grep bridge", () => {
	let cwd: string;
	let searchTool: GrepTool;
	let handlers: CursorExecHandlers;

	beforeEach(async () => {
		cwd = await fs.mkdtemp(path.join(os.tmpdir(), "cursor-exec-test-"));
		await Bun.write(path.join(cwd, "sample.txt"), "Hello World\nhello world\n");
		searchTool = new GrepTool(createTestSession(cwd));
		handlers = new CursorExecHandlers({
			cwd,
			tools: new Map([["grep", searchTool as any]]),
		});
	});

	afterEach(async () => {
		await removeWithRetries(cwd);
	});

	it("maps caseInsensitive parameter correctly through the grep bridge", async () => {
		// 1. By default/omitted caseInsensitive, should be case-sensitive (match count 1 for "hello")
		const defaultResult = await handlers.grep({
			toolCallId: "call-1",
			path: cwd,
			pattern: "hello",
		} as any);
		expect((defaultResult.details as { matchCount?: number } | undefined)?.matchCount).toBe(1);

		// 2. If caseInsensitive: true, should be case-insensitive (match count 2 for "hello")
		const insensitiveResult = await handlers.grep({
			toolCallId: "call-2",
			path: cwd,
			pattern: "hello",
			caseInsensitive: true,
		} as any);
		expect((insensitiveResult.details as { matchCount?: number } | undefined)?.matchCount).toBe(2);

		// 3. If caseInsensitive: false, should be case-sensitive (match count 1 for "hello")
		const sensitiveResult = await handlers.grep({
			toolCallId: "call-3",
			path: cwd,
			pattern: "hello",
			caseInsensitive: false,
		} as any);
		expect((sensitiveResult.details as { matchCount?: number } | undefined)?.matchCount).toBe(1);
	});
});

describe("CursorExecHandlers error results", () => {
	const rewrittenErrorTool = (name: string): AgentTool => ({
		name,
		label: name,
		description: "returns a rewritten tool failure",
		parameters: type({}),
		execute: async () => ({
			content: [{ type: "text", text: "Enriched recovery guidance" }],
			details: { enriched: true },
			isError: true,
		}),
	});

	it("propagates returned isError through the standard exec bridge", async () => {
		const events: AgentEvent[] = [];
		const handlers = new CursorExecHandlers({
			cwd: ".",
			tools: new Map([["read", rewrittenErrorTool("read")]]),
			emitEvent: event => events.push(event),
		});

		const result = await handlers.read(create(ReadArgsSchema, { toolCallId: "call-read", path: "ignored" }));
		expect(result.isError).toBe(true);
		expect(result.content).toEqual([{ type: "text", text: "Enriched recovery guidance" }]);
		const end = events.find(event => event.type === "tool_execution_end");
		expect(end?.isError).toBe(true);
	});

	it("propagates returned isError through the shell stream bridge", async () => {
		const events: AgentEvent[] = [];
		const stdout: string[] = [];
		const handlers = new CursorExecHandlers({
			cwd: ".",
			tools: new Map([["bash", rewrittenErrorTool("bash")]]),
			emitEvent: event => events.push(event),
		});

		const result = await handlers.shellStream(
			create(ShellArgsSchema, { toolCallId: "call-shell", command: "ignored" }),
			{
				onStdout: data => stdout.push(data),
				onStderr: () => {},
			},
		);
		expect(result.isError).toBe(true);
		expect(result.content).toEqual([{ type: "text", text: "Enriched recovery guidance" }]);
		expect(stdout).toEqual(["Enriched recovery guidance"]);
		const end = events.find(event => event.type === "tool_execution_end");
		expect(end?.isError).toBe(true);
	});
});

describe("CursorExecHandlers mounted tool bridge", () => {
	it("executes MCP tools resolved from the xd:// registry", async () => {
		const mountedTool: AgentTool = {
			name: "mcp__fixture_report",
			label: "Fixture Report",
			description: "reports a fixture result",
			parameters: type({}),
			async execute() {
				return { content: [{ type: "text", text: "reported" }], details: {} };
			},
		};
		const handlers = new CursorExecHandlers({
			cwd: ".",
			tools: new Map(),
			getTool: name => (name === mountedTool.name ? mountedTool : undefined),
		});

		const result = await handlers.mcp({
			name: mountedTool.name,
			providerIdentifier: "pi-agent",
			toolName: mountedTool.name,
			toolCallId: "call-mounted",
			args: {},
			rawArgs: {},
		});

		expect(result.isError).toBe(false);
		expect(result.content).toEqual([{ type: "text", text: "reported" }]);
	});

	it("routes wrapped mounted devices through the approval gate", async () => {
		let executed = false;
		const device: AgentTool = {
			name: "ast_edit",
			label: "AST Edit",
			description: "structural edit device",
			parameters: type({}),
			async execute() {
				executed = true;
				return { content: [{ type: "text", text: "edited" }], details: {} };
			},
		};
		// The deny path throws inside resolveApproval before the runner is touched,
		// so a bare runner stub suffices to prove the gate runs.
		const wrapped = new ExtensionToolWrapper(device, {} as unknown as ExtensionRunner);
		const settings = Settings.isolated({ "tools.approval": { ast_edit: "deny" } });
		const handlers = new CursorExecHandlers({
			cwd: ".",
			tools: new Map(),
			getTool: name => (name === device.name ? (wrapped as unknown as AgentTool) : undefined),
			getToolContext: () => ({ settings }) as AgentToolContext,
		});

		const result = await handlers.mcp({
			name: device.name,
			providerIdentifier: "pi-agent",
			toolName: device.name,
			toolCallId: "call-denied",
			args: {},
			rawArgs: {},
		});

		expect(result.isError).toBe(true);
		expect(executed).toBe(false);
		expect(result.content.find(block => block.type === "text")?.text).toContain("blocked by user policy");
	});
});