import { INestApplication } from "@nestjs/common";
import request from "supertest";
import { buildTestApp } from "./app.harness";

/**
 * MCP controller integration tests.
 *
 * The MCP endpoint speaks the Model Context Protocol (streamable HTTP
 * transport).  We test:
 *  - that the endpoint is reachable and returns a recognised MCP response
 *  - that tool invocations for read-only, non-browser tools work end-to-end
 *  - that tools with bad inputs return error payloads (not HTTP 5xx)
 *
 * Browser-dependent tools (open_url, exec_code) require a live Playwright
 * session and are not covered here.
 */
describe("McpController", () => {
  let app: INestApplication;

  beforeAll(async () => {
    app = await buildTestApp();
  });

  afterAll(async () => {
    await app.close();
  });

  /** Parse the JSON-RPC payload from an SSE response body. */
  function parseSse(text: string): Record<string, unknown> {
    const match = text.match(/^data:\s*(.+)$/m);
    if (!match) throw new Error(`No SSE data line found in: ${text}`);
    return JSON.parse(match[1]) as Record<string, unknown>;
  }

  /** Send a single MCP tool call and return the parsed response body. */
  async function mcpCall(toolName: string, args: Record<string, unknown> = {}) {
    const res = await request(app.getHttpServer())
      .post("/mcp")
      .set("Content-Type", "application/json")
      .set("Accept", "application/json, text/event-stream")
      .send({
        jsonrpc: "2.0",
        id: 1,
        method: "tools/call",
        params: { name: toolName, arguments: args },
      });
    return { status: res.status, rpc: parseSse(res.text) };
  }

  // ── Connectivity ───────────────────────────────────────────────────────────

  describe("POST /mcp — connectivity", () => {
    it("is reachable and returns a non-5xx status", async () => {
      const res = await request(app.getHttpServer())
        .post("/mcp")
        .set("Content-Type", "application/json")
        .set("Accept", "application/json, text/event-stream")
        .send({
          jsonrpc: "2.0",
          id: 1,
          method: "initialize",
          params: {
            protocolVersion: "2024-11-05",
            capabilities: {},
            clientInfo: { name: "test", version: "0" },
          },
        });
      expect(res.status).toBe(200);
    });
  });

  // ── list_keys tool (removed) ──────────────────────────────────────────────

  describe("list_keys", () => {
    it("returns MCP error for removed tool", async () => {
      const { status, rpc } = await mcpCall("list_keys");
      expect(status).toBe(200);
      const result = rpc.result as {
        isError: boolean;
        content?: { text: string }[];
      };
      expect(result.isError).toBe(true);
    });
  });

  // ── list_sessions tool ─────────────────────────────────────────────────────

  describe("list_sessions", () => {
    it("returns a paginated result with a data array", async () => {
      const { status, rpc } = await mcpCall("list_sessions");
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      const body = JSON.parse(result.content[0].text) as {
        data: unknown[];
        total: number;
      };
      expect(Array.isArray(body.data)).toBe(true);
      expect(typeof body.total).toBe("number");
    });
  });

  // ── list_environments tool ─────────────────────────────────────────────────

  describe("list_environments", () => {
    it("returns a paginated result with a data array", async () => {
      const { status, rpc } = await mcpCall("list_environments");
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      const body = JSON.parse(result.content[0].text) as {
        data: unknown[];
        total: number;
      };
      expect(Array.isArray(body.data)).toBe(true);
      expect(typeof body.total).toBe("number");
    });
  });

  // ── create_environment tool ────────────────────────────────────────────────

  describe("create_environment", () => {
    it("creates an environment via MCP", async () => {
      const { status, rpc } = await mcpCall("create_environment", {
        name: "mcp-test-env",
        data: { id: "https://id.example.com" },
      });
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      const created = JSON.parse(result.content[0].text) as { name: string };
      expect(created.name).toBe("mcp-test-env");
    });
  });

  // ── delete_session tool with unknown id ────────────────────────────────────

  describe("delete_session", () => {
    it("returns an MCP error result for a non-existent session id", async () => {
      const { status, rpc } = await mcpCall("delete_session", { id: 999999 });
      expect(status).toBe(200);
      // MCP wraps service errors as isError:true content, not HTTP errors
      const result = rpc.result as { isError: boolean };
      expect(result.isError).toBe(true);
    });
  });

  // ── create_scenario / update_scenario timeoutSeconds ──────────────────────

  describe("create_scenario with timeoutSeconds", () => {
    it("saves timeoutSeconds on the created scenario", async () => {
      const { status, rpc } = await mcpCall("create_scenario", {
        name: "mcp-timeout-sc",
        timeoutSeconds: 300,
      });
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      const created = JSON.parse(result.content[0].text) as {
        name: string;
        timeoutSeconds: number | null;
      };
      expect(created.name).toBe("mcp-timeout-sc");
      expect(created.timeoutSeconds).toBe(300);
    });

    it("stores null timeoutSeconds when not provided", async () => {
      const { rpc } = await mcpCall("create_scenario", {
        name: "mcp-no-timeout",
      });
      const result = rpc.result as { content: { text: string }[] };
      const created = JSON.parse(result.content[0].text) as {
        timeoutSeconds: number | null;
      };
      expect(created.timeoutSeconds).toBeNull();
    });
  });

  describe("update_scenario timeoutSeconds", () => {
    it("updates and clears timeoutSeconds", async () => {
      // create
      const createRpc = (
        await mcpCall("create_scenario", { name: "mcp-upd-timeout" })
      ).rpc;
      const created = JSON.parse(
        (createRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { id: string };

      // set
      const setRpc = (
        await mcpCall("update_scenario", {
          id: created.id,
          timeoutSeconds: 120,
        })
      ).rpc;
      const updated = JSON.parse(
        (setRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { timeoutSeconds: number | null };
      expect(updated.timeoutSeconds).toBe(120);

      // clear
      const clearRpc = (
        await mcpCall("update_scenario", {
          id: created.id,
          timeoutSeconds: null,
        })
      ).rpc;
      const cleared = JSON.parse(
        (clearRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { timeoutSeconds: number | null };
      expect(cleared.timeoutSeconds).toBeNull();
    });
  });

  // ── create_scenario_step / update_scenario_step timeoutSeconds ────────────

  describe("create_scenario_step with timeoutSeconds", () => {
    it("saves timeoutSeconds on the created step", async () => {
      // create a scenario first
      const scRpc = (
        await mcpCall("create_scenario", { name: "mcp-step-timeout-parent" })
      ).rpc;
      const sc = JSON.parse(
        (scRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { id: string };

      const { status, rpc } = await mcpCall("create_scenario_step", {
        scenarioId: sc.id,
        order: 0,
        type: "exec",
        execCode: "return 1;",
        timeoutSeconds: 45,
      });
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      const step = JSON.parse(result.content[0].text) as {
        timeoutSeconds: number | null;
      };
      expect(step.timeoutSeconds).toBe(45);
    });
  });

  describe("update_scenario_step timeoutSeconds", () => {
    it("updates and clears step timeoutSeconds", async () => {
      // create scenario + step
      const scRpc = (
        await mcpCall("create_scenario", { name: "mcp-step-upd-parent" })
      ).rpc;
      const sc = JSON.parse(
        (scRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { id: string };

      const stepRpc = (
        await mcpCall("create_scenario_step", {
          scenarioId: sc.id,
          order: 0,
          type: "exec",
        })
      ).rpc;
      const step = JSON.parse(
        (stepRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { id: string };

      // set
      const setRpc = (
        await mcpCall("update_scenario_step", {
          scenarioId: sc.id,
          stepId: step.id,
          timeoutSeconds: 90,
        })
      ).rpc;
      const updated = JSON.parse(
        (setRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { timeoutSeconds: number | null };
      expect(updated.timeoutSeconds).toBe(90);

      // clear
      const clearRpc = (
        await mcpCall("update_scenario_step", {
          scenarioId: sc.id,
          stepId: step.id,
          timeoutSeconds: null,
        })
      ).rpc;
      const cleared = JSON.parse(
        (clearRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { timeoutSeconds: number | null };
      expect(cleared.timeoutSeconds).toBeNull();
    });
  });

  // ── Snippet CRUD tools ────────────────────────────────────────────────────

  describe("list_snippets", () => {
    it("returns a paginated result with a data array", async () => {
      const { status, rpc } = await mcpCall("list_snippets");
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      const body = JSON.parse(result.content[0].text) as {
        data: unknown[];
        total: number;
      };
      expect(Array.isArray(body.data)).toBe(true);
      expect(typeof body.total).toBe("number");
    });
  });

  describe("create_snippet", () => {
    it("creates a snippet and returns it with alias and title", async () => {
      const { status, rpc } = await mcpCall("create_snippet", {
        alias: "mcp-test-snippet",
        title: "MCP Test Snippet",
        description: "Created by integration test",
        code: "await page.click('#btn');",
      });
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      const created = JSON.parse(result.content[0].text) as {
        id: string;
        alias: string;
        title: string;
        description: string | null;
        code: string;
      };
      expect(created.alias).toBe("mcp-test-snippet");
      expect(created.title).toBe("MCP Test Snippet");
      expect(created.description).toBe("Created by integration test");
      expect(created.code).toBe("await page.click('#btn');");
      expect(typeof created.id).toBe("string");
    });

    it("returns an MCP error when alias already exists", async () => {
      await mcpCall("create_snippet", {
        alias: "mcp-duplicate-snippet",
        title: "First",
        code: "return 1;",
      });
      const { status, rpc } = await mcpCall("create_snippet", {
        alias: "mcp-duplicate-snippet",
        title: "Second",
        code: "return 2;",
      });
      expect(status).toBe(200);
      const result = rpc.result as { isError: boolean };
      expect(result.isError).toBe(true);
    });
  });

  describe("get_snippet", () => {
    it("returns the created snippet by id", async () => {
      const createRpc = (
        await mcpCall("create_snippet", {
          alias: "mcp-get-snippet",
          title: "Get Me",
          code: "return 42;",
        })
      ).rpc;
      const created = JSON.parse(
        (createRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { id: string };

      const { status, rpc } = await mcpCall("get_snippet", { id: created.id });
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      const fetched = JSON.parse(result.content[0].text) as {
        id: string;
        alias: string;
      };
      expect(fetched.id).toBe(created.id);
      expect(fetched.alias).toBe("mcp-get-snippet");
    });

    it("returns an MCP error for a non-existent snippet id", async () => {
      const { status, rpc } = await mcpCall("get_snippet", {
        id: "00000000-0000-0000-0000-000000000000",
      });
      expect(status).toBe(200);
      const result = rpc.result as { isError: boolean };
      expect(result.isError).toBe(true);
    });
  });

  describe("update_snippet", () => {
    it("updates alias, title, and code of an existing snippet", async () => {
      const createRpc = (
        await mcpCall("create_snippet", {
          alias: "mcp-upd-snippet-orig",
          title: "Original Title",
          code: "return 1;",
        })
      ).rpc;
      const created = JSON.parse(
        (createRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { id: string };

      const { status, rpc } = await mcpCall("update_snippet", {
        id: created.id,
        alias: "mcp-upd-snippet-new",
        title: "Updated Title",
        code: "return 2;",
      });
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      const updated = JSON.parse(result.content[0].text) as {
        alias: string;
        title: string;
        code: string;
      };
      expect(updated.alias).toBe("mcp-upd-snippet-new");
      expect(updated.title).toBe("Updated Title");
      expect(updated.code).toBe("return 2;");
    });

    it("returns an MCP error for a non-existent snippet id", async () => {
      const { status, rpc } = await mcpCall("update_snippet", {
        id: "00000000-0000-0000-0000-000000000000",
        title: "Ghost",
      });
      expect(status).toBe(200);
      const result = rpc.result as { isError: boolean };
      expect(result.isError).toBe(true);
    });
  });

  describe("delete_snippet", () => {
    it("deletes an existing snippet and confirms deletion", async () => {
      const createRpc = (
        await mcpCall("create_snippet", {
          alias: "mcp-del-snippet",
          title: "Delete Me",
          code: "return 0;",
        })
      ).rpc;
      const created = JSON.parse(
        (createRpc.result as { content: { text: string }[] }).content[0].text,
      ) as { id: string };

      const { status, rpc } = await mcpCall("delete_snippet", {
        id: created.id,
      });
      expect(status).toBe(200);
      const result = rpc.result as { content: { text: string }[] };
      expect(result.content[0].text).toContain(created.id);

      // confirm gone
      const getResult = (await mcpCall("get_snippet", { id: created.id }))
        .rpc.result as { isError: boolean };
      expect(getResult.isError).toBe(true);
    });

    it("returns an MCP error for a non-existent snippet id", async () => {
      const { status, rpc } = await mcpCall("delete_snippet", {
        id: "00000000-0000-0000-0000-000000000000",
      });
      expect(status).toBe(200);
      const result = rpc.result as { isError: boolean };
      expect(result.isError).toBe(true);
    });
  });
});