/**
 * Unit tests for perplexity-web executor
 *
 * Covers:
 *  - Message parsing (system/user/assistant/developer, multi-part content)
 *  - Query building for first turn vs follow-up (session continuity)
 *  - Tools injection into instructions
 *  - Request body shape (dual query_str top-level + params.query_str is required by upstream)
 *  - Auth header construction (apiKey → Cookie, accessToken → Bearer)
 *  - Model mapping (normal + thinking)
 *  - Error handling (401, 429)
 */

import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import {
  parseOpenAIMessages,
  buildQuery,
  buildPplxRequestBody,
  formatToolsHint,
  PerplexityWebExecutor,
} from "../../open-sse/executors/perplexity-web.js";

const originalFetch = global.fetch;

function mockPplxStream(events) {
  const chunks = events.map((e) => `data: ${JSON.stringify(e)}\n\n`).join("") + "data: [DONE]\n\n";
  return new Response(new Blob([chunks]).stream(), {
    status: 200,
    headers: { "Content-Type": "text/event-stream" },
  });
}

describe("parseOpenAIMessages", () => {
  it("extracts system + history + current msg", () => {
    const parsed = parseOpenAIMessages([
      { role: "system", content: "Be helpful" },
      { role: "user", content: "Q1" },
      { role: "assistant", content: "A1" },
      { role: "user", content: "Q2" },
    ]);
    expect(parsed.systemMsg.trim()).toBe("Be helpful");
    expect(parsed.history).toEqual([
      { role: "user", content: "Q1" },
      { role: "assistant", content: "A1" },
    ]);
    expect(parsed.currentMsg).toBe("Q2");
  });

  it("treats developer role as system", () => {
    const parsed = parseOpenAIMessages([
      { role: "developer", content: "Be concise" },
      { role: "user", content: "hi" },
    ]);
    expect(parsed.systemMsg.trim()).toBe("Be concise");
    expect(parsed.currentMsg).toBe("hi");
  });

  it("handles multi-part content (array of text blocks)", () => {
    const parsed = parseOpenAIMessages([
      { role: "user", content: [{ type: "text", text: "part1" }, { type: "text", text: "part2" }] },
    ]);
    expect(parsed.currentMsg).toBe("part1 part2");
  });

  it("skips empty content messages", () => {
    const parsed = parseOpenAIMessages([
      { role: "user", content: "   " },
      { role: "user", content: "real" },
    ]);
    expect(parsed.currentMsg).toBe("real");
  });
});

describe("buildQuery", () => {
  it("first turn: returns JSON with instructions + query", () => {
    const parsed = { systemMsg: "Be helpful\n", history: [], currentMsg: "Hello" };
    const q = buildQuery(parsed, null);
    const obj = JSON.parse(q);
    expect(obj.query).toBe("Hello");
    expect(obj.instructions).toContain("Be helpful");
    expect(obj.instructions.some((s) => s.includes("web search"))).toBe(true);
  });

  it("follow-up (with backendUuid): returns plain currentMsg, no JSON", () => {
    const parsed = {
      systemMsg: "Be helpful",
      history: [{ role: "user", content: "Q1" }, { role: "assistant", content: "A1" }],
      currentMsg: "Follow up",
    };
    const q = buildQuery(parsed, "uuid-abc-123");
    expect(q).toBe("Follow up");
  });

  it("includes history when present on first turn", () => {
    const parsed = {
      systemMsg: "",
      history: [{ role: "user", content: "earlier" }],
      currentMsg: "now",
    };
    const obj = JSON.parse(buildQuery(parsed, null));
    expect(obj.history).toEqual([{ role: "user", content: "earlier" }]);
    expect(obj.query).toBe("now");
  });

  it("injects tools into instructions on first turn", () => {
    const parsed = { systemMsg: "", history: [], currentMsg: "hi" };
    const tools = [
      { function: { name: "Shell", description: "Run bash" } },
      { function: { name: "Read", description: "Read file" } },
    ];
    const obj = JSON.parse(buildQuery(parsed, null, tools));
    const hint = obj.instructions.find((s) => s.includes("Available tools"));
    expect(hint).toBeDefined();
    expect(hint).toContain("- Shell: Run bash");
    expect(hint).toContain("- Read: Read file");
  });

  it("ignores tools on follow-up turn (uses session)", () => {
    const parsed = { systemMsg: "", history: [{ role: "user", content: "x" }], currentMsg: "y" };
    const tools = [{ function: { name: "Shell", description: "d" } }];
    const q = buildQuery(parsed, "uuid", tools);
    expect(q).toBe("y");
  });

  it("truncates query if JSON exceeds 96000 chars", () => {
    const big = "x".repeat(100000);
    const parsed = { systemMsg: big, history: [], currentMsg: "hi" };
    const q = buildQuery(parsed, null);
    expect(q.length).toBeLessThanOrEqual(96000);
  });
});

describe("formatToolsHint", () => {
  it("returns empty string for no tools", () => {
    expect(formatToolsHint()).toBe("");
    expect(formatToolsHint([])).toBe("");
  });

  it("handles OpenAI tool schema (function wrapper)", () => {
    const out = formatToolsHint([{ function: { name: "Foo", description: "does foo" } }]);
    expect(out).toContain("- Foo: does foo");
  });

  it("handles flat tool schema", () => {
    const out = formatToolsHint([{ name: "Bar", description: "does bar" }]);
    expect(out).toContain("- Bar: does bar");
  });

  it("truncates long descriptions to first line, max 200 chars", () => {
    const longDesc = "line1\nline2\nline3";
    const out = formatToolsHint([{ function: { name: "X", description: longDesc } }]);
    expect(out).toContain("- X: line1");
    expect(out).not.toContain("line2");
  });
});

describe("buildPplxRequestBody", () => {
  it("sets query_str at both top-level AND params (required by upstream API)", () => {
    const body = buildPplxRequestBody("hello world", "concise", "pplx_pro", null);
    expect(body.query_str).toBe("hello world");
    expect(body.params.query_str).toBe("hello world");
  });

  it("includes required params", () => {
    const body = buildPplxRequestBody("q", "copilot", "claude46sonnet", "uuid-xyz");
    expect(body.params.search_focus).toBe("internet");
    expect(body.params.mode).toBe("copilot");
    expect(body.params.model_preference).toBe("claude46sonnet");
    expect(body.params.sources).toEqual(["web"]);
    expect(body.params.use_schematized_api).toBe(true);
    expect(body.params.is_incognito).toBe(true);
    expect(body.params.last_backend_uuid).toBe("uuid-xyz");
    expect(body.params.version).toBe("2.18");
  });
});

describe("PerplexityWebExecutor.execute", () => {
  let capturedUrl;
  let capturedOpts;
  let capturedBody;

  beforeEach(() => {
    capturedUrl = null;
    capturedOpts = null;
    capturedBody = null;
    global.fetch = vi.fn(async (url, opts) => {
      capturedUrl = url;
      capturedOpts = opts;
      capturedBody = JSON.parse(opts.body);
      return mockPplxStream([
        {
          blocks: [{ intended_usage: "markdown", markdown_block: { chunks: ["answer"], progress: "DONE" } }],
          status: "COMPLETED",
          backend_uuid: "resp-uuid-1",
        },
      ]);
    });
  });

  afterEach(() => {
    global.fetch = originalFetch;
  });

  it("maps pplx-auto → mode=concise, pref=pplx_pro", async () => {
    const exec = new PerplexityWebExecutor();
    await exec.execute({
      model: "pplx-auto",
      body: { messages: [{ role: "user", content: "hi" }], stream: false },
      stream: false,
      credentials: { apiKey: "cookie-abc" },
    });
    expect(capturedBody.params.mode).toBe("concise");
    expect(capturedBody.params.model_preference).toBe("pplx_pro");
  });

  it("applies THINKING_MAP when reasoning_effort is set", async () => {
    const exec = new PerplexityWebExecutor();
    await exec.execute({
      model: "pplx-opus",
      body: { messages: [{ role: "user", content: "hi" }], stream: false, reasoning_effort: "high" },
      stream: false,
      credentials: { apiKey: "cookie-abc" },
    });
    expect(capturedBody.params.mode).toBe("copilot");
    expect(capturedBody.params.model_preference).toBe("claude46opusthinking");
  });

  it("sends Cookie header when credentials.apiKey provided", async () => {
    const exec = new PerplexityWebExecutor();
    await exec.execute({
      model: "pplx-auto",
      body: { messages: [{ role: "user", content: "hi" }], stream: false },
      stream: false,
      credentials: { apiKey: "my-session-token" },
    });
    expect(capturedOpts.headers.Cookie).toBe("__Secure-next-auth.session-token=my-session-token");
    expect(capturedOpts.headers.Authorization).toBeUndefined();
  });

  it("sends Bearer header when credentials.accessToken provided", async () => {
    const exec = new PerplexityWebExecutor();
    await exec.execute({
      model: "pplx-auto",
      body: { messages: [{ role: "user", content: "hi" }], stream: false },
      stream: false,
      credentials: { accessToken: "tok-1" },
    });
    expect(capturedOpts.headers.Authorization).toBe("Bearer tok-1");
  });

  it("injects body.tools into query_str instructions", async () => {
    const exec = new PerplexityWebExecutor();
    await exec.execute({
      model: "pplx-auto",
      body: {
        messages: [{ role: "user", content: "what tools do you have?" }],
        tools: [{ function: { name: "Shell", description: "Execute commands" } }],
        stream: false,
      },
      stream: false,
      credentials: { apiKey: "c" },
    });
    const queryObj = JSON.parse(capturedBody.query_str);
    const toolsHint = queryObj.instructions.find((s) => s.includes("Available tools"));
    expect(toolsHint).toContain("- Shell: Execute commands");
  });

  it("returns 400 on missing messages", async () => {
    const exec = new PerplexityWebExecutor();
    const { response } = await exec.execute({
      model: "pplx-auto",
      body: {},
      stream: false,
      credentials: { apiKey: "c" },
    });
    expect(response.status).toBe(400);
  });

  it("surfaces upstream 401 with friendly auth message", async () => {
    global.fetch = vi.fn(async () => new Response(JSON.stringify({ error: "bad" }), { status: 401 }));
    const exec = new PerplexityWebExecutor();
    const { response } = await exec.execute({
      model: "pplx-auto",
      body: { messages: [{ role: "user", content: "hi" }] },
      stream: false,
      credentials: { apiKey: "bad-cookie" },
    });
    expect(response.status).toBe(401);
    const j = await response.json();
    expect(j.error.message).toMatch(/auth failed|expired/i);
  });

  it("surfaces 429 with rate-limit message", async () => {
    global.fetch = vi.fn(async () => new Response("", { status: 429 }));
    const exec = new PerplexityWebExecutor();
    const { response } = await exec.execute({
      model: "pplx-auto",
      body: { messages: [{ role: "user", content: "hi" }] },
      stream: false,
      credentials: { apiKey: "c" },
    });
    expect(response.status).toBe(429);
    const j = await response.json();
    expect(j.error.message).toMatch(/rate limited/i);
  });
});