import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import type { OpenClawConfig } from "../../config/config.js";
import * as pdfExtractModule from "../../media/pdf-extract.js";
import * as webMedia from "../../media/web-media.js";
import * as modelAuth from "../model-auth.js";
import * as modelsConfig from "../models-config.js";
import * as modelDiscovery from "../pi-model-discovery.js";
import * as pdfNativeProviders from "./pdf-native-providers.js";
import { resetPdfToolAuthEnv, withTempPdfAgentDir } from "./pdf-tool.test-support.js";

const completeMock = vi.hoisted(() => vi.fn());

vi.mock("@mariozechner/pi-ai", async () => {
  const actual = await vi.importActual<typeof import("@mariozechner/pi-ai")>("@mariozechner/pi-ai");
  return {
    ...actual,
    complete: completeMock,
  };
});

type PdfToolModule = typeof import("./pdf-tool.js");
let createPdfTool: PdfToolModule["createPdfTool"];
let PdfToolSchema: PdfToolModule["PdfToolSchema"];

async function loadCreatePdfTool() {
  if (!createPdfTool || !PdfToolSchema) {
    ({ createPdfTool, PdfToolSchema } = await import("./pdf-tool.js"));
  }
  return createPdfTool;
}

const ANTHROPIC_PDF_MODEL = "anthropic/claude-opus-4-6";
const OPENAI_PDF_MODEL = "openai/gpt-5.4-mini";
const FAKE_PDF_MEDIA = {
  kind: "document",
  buffer: Buffer.from("%PDF-1.4 fake"),
  contentType: "application/pdf",
  fileName: "doc.pdf",
} as const;

function requirePdfTool(
  tool: Awaited<ReturnType<typeof loadCreatePdfTool>> extends (...args: any[]) => infer R
    ? R
    : never,
) {
  expect(tool).not.toBeNull();
  if (!tool) {
    throw new Error("expected pdf tool");
  }
  return tool;
}

type PdfToolInstance = ReturnType<typeof requirePdfTool>;

async function withConfiguredPdfTool(
  run: (tool: PdfToolInstance, agentDir: string) => Promise<void>,
) {
  await withTempPdfAgentDir(async (agentDir) => {
    const cfg = withPdfModel(ANTHROPIC_PDF_MODEL);
    const tool = requirePdfTool((await loadCreatePdfTool())({ config: cfg, agentDir }));
    await run(tool, agentDir);
  });
}

function withPdfModel(primary: string): OpenClawConfig {
  return {
    agents: { defaults: { pdfModel: { primary } } },
  } as OpenClawConfig;
}

async function stubPdfToolInfra(
  agentDir: string,
  params?: {
    provider?: string;
    input?: string[];
    modelFound?: boolean;
  },
) {
  const loadSpy = vi.spyOn(webMedia, "loadWebMediaRaw").mockResolvedValue(FAKE_PDF_MEDIA as never);

  vi.spyOn(modelDiscovery, "discoverAuthStorage").mockReturnValue({
    setRuntimeApiKey: vi.fn(),
  } as never);
  const find =
    params?.modelFound === false
      ? () => null
      : () =>
          ({
            provider: params?.provider ?? "anthropic",
            maxTokens: 8192,
            input: params?.input ?? ["text", "document"],
          }) as never;
  vi.spyOn(modelDiscovery, "discoverModels").mockReturnValue({ find } as never);

  vi.spyOn(modelsConfig, "ensureOpenClawModelsJson").mockResolvedValue({
    agentDir,
    wrote: false,
  });

  vi.spyOn(modelAuth, "getApiKeyForModel").mockResolvedValue({ apiKey: "test-key" } as never);
  vi.spyOn(modelAuth, "requireApiKey").mockReturnValue("test-key");

  return { loadSpy };
}

describe("createPdfTool", () => {
  const priorFetch = global.fetch;

  beforeEach(() => {
    resetPdfToolAuthEnv();
    completeMock.mockReset();
  });

  afterEach(() => {
    vi.restoreAllMocks();
    vi.unstubAllEnvs();
    global.fetch = priorFetch;
  });

  it("returns null without agentDir and no explicit config", async () => {
    expect((await loadCreatePdfTool())()).toBeNull();
  });

  it("throws when agentDir missing but explicit config present", async () => {
    const cfg = withPdfModel(ANTHROPIC_PDF_MODEL);
    const createTool = await loadCreatePdfTool();
    expect(() => createTool({ config: cfg })).toThrow("requires agentDir");
  });

  it("creates tool when a PDF model is configured", async () => {
    await withConfiguredPdfTool(async (tool) => {
      expect(tool.name).toBe("pdf");
      expect(tool.label).toBe("PDF");
      expect(tool.description).toContain("PDF documents");
    });
  });

  it("rejects when no pdf input provided", async () => {
    await withConfiguredPdfTool(async (tool) => {
      await expect(tool.execute("t1", { prompt: "test" })).rejects.toThrow("pdf required");
    });
  });

  it("rejects too many PDFs", async () => {
    await withConfiguredPdfTool(async (tool) => {
      const manyPdfs = Array.from({ length: 15 }, (_, i) => `/tmp/doc${i}.pdf`);
      const result = await tool.execute("t1", { prompt: "test", pdfs: manyPdfs });
      expect(result).toMatchObject({
        details: { error: "too_many_pdfs" },
      });
    });
  });

  it("respects fsPolicy.workspaceOnly for non-sandbox pdf paths", async () => {
    await withTempPdfAgentDir(async (agentDir) => {
      const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-pdf-ws-"));
      const outsideDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-pdf-out-"));
      try {
        const cfg = withPdfModel(ANTHROPIC_PDF_MODEL);
        const tool = requirePdfTool(
          (await loadCreatePdfTool())({
            config: cfg,
            agentDir,
            workspaceDir,
            fsPolicy: { workspaceOnly: true },
          }),
        );

        const outsidePdf = path.join(outsideDir, "secret.pdf");
        await fs.writeFile(outsidePdf, "%PDF-1.4 fake");

        await expect(tool.execute("t1", { prompt: "test", pdf: outsidePdf })).rejects.toThrow(
          /not under an allowed directory/i,
        );
      } finally {
        await fs.rm(workspaceDir, { recursive: true, force: true });
        await fs.rm(outsideDir, { recursive: true, force: true });
      }
    });
  });

  it("rejects unsupported scheme references", async () => {
    await withConfiguredPdfTool(async (tool) => {
      const result = await tool.execute("t1", {
        prompt: "test",
        pdf: "ftp://example.com/doc.pdf",
      });
      expect(result).toMatchObject({
        details: { error: "unsupported_pdf_reference" },
      });
    });
  });

  it("uses native PDF path without eager extraction", async () => {
    await withTempPdfAgentDir(async (agentDir) => {
      await stubPdfToolInfra(agentDir, { provider: "anthropic", input: ["text", "document"] });
      vi.spyOn(pdfNativeProviders, "anthropicAnalyzePdf").mockResolvedValue("native summary");
      const extractSpy = vi.spyOn(pdfExtractModule, "extractPdfContent");
      const cfg = withPdfModel(ANTHROPIC_PDF_MODEL);
      const tool = requirePdfTool((await loadCreatePdfTool())({ config: cfg, agentDir }));

      const result = await tool.execute("t1", {
        prompt: "summarize",
        pdf: "/tmp/doc.pdf",
      });

      expect(extractSpy).not.toHaveBeenCalled();
      expect(result).toMatchObject({
        content: [{ type: "text", text: "native summary" }],
        details: { native: true, model: ANTHROPIC_PDF_MODEL },
      });
    });
  });

  it("rejects pages parameter for native PDF providers", async () => {
    await withTempPdfAgentDir(async (agentDir) => {
      await stubPdfToolInfra(agentDir, { provider: "anthropic", input: ["text", "document"] });
      const cfg = withPdfModel(ANTHROPIC_PDF_MODEL);
      const tool = requirePdfTool((await loadCreatePdfTool())({ config: cfg, agentDir }));

      await expect(
        tool.execute("t1", {
          prompt: "summarize",
          pdf: "/tmp/doc.pdf",
          pages: "1-2",
        }),
      ).rejects.toThrow("pages is not supported with native PDF providers");
    });
  });

  it("uses extraction fallback for non-native models", async () => {
    await withTempPdfAgentDir(async (agentDir) => {
      await stubPdfToolInfra(agentDir, { provider: "openai", input: ["text"] });
      const extractSpy = vi.spyOn(pdfExtractModule, "extractPdfContent").mockResolvedValue({
        text: "Extracted content",
        images: [],
      });
      completeMock.mockResolvedValue({
        role: "assistant",
        stopReason: "stop",
        content: [{ type: "text", text: "fallback summary" }],
      } as never);

      const cfg = withPdfModel(OPENAI_PDF_MODEL);
      const tool = requirePdfTool((await loadCreatePdfTool())({ config: cfg, agentDir }));

      const result = await tool.execute("t1", {
        prompt: "summarize",
        pdf: "/tmp/doc.pdf",
      });

      expect(extractSpy).toHaveBeenCalledTimes(1);
      expect(result).toMatchObject({
        content: [{ type: "text", text: "fallback summary" }],
        details: { native: false, model: OPENAI_PDF_MODEL },
      });
    });
  });

  it("tool parameters have correct schema shape", async () => {
    await loadCreatePdfTool();
    const schema = PdfToolSchema;
    expect(schema.type).toBe("object");
    expect(schema.properties).toBeDefined();
    const props = schema.properties as Record<string, { type?: string }>;
    expect(props.prompt).toBeDefined();
    expect(props.pdf).toBeDefined();
    expect(props.pdfs).toBeDefined();
    expect(props.pages).toBeDefined();
    expect(props.model).toBeDefined();
    expect(props.maxBytesMb).toBeDefined();
  });
});