import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { describe, expect, test, vi } from "vitest";
import type { GetReplyOptions } from "../auto-reply/types.js";
import { __setMaxChatHistoryMessagesBytesForTest } from "./server-constants.js";
import {
  connectOk,
  getReplyFromConfig,
  installGatewayTestHooks,
  onceMessage,
  rpcReq,
  startServerWithClient,
  testState,
  writeSessionStore,
} from "./test-helpers.js";

installGatewayTestHooks({ scope: "suite" });

const sendReq = (
  ws: { send: (payload: string) => void },
  id: string,
  method: string,
  params: unknown,
) => {
  ws.send(
    JSON.stringify({
      type: "req",
      id,
      method,
      params,
    }),
  );
};

async function withGatewayChatHarness(
  run: (ctx: {
    ws: Awaited<ReturnType<typeof startServerWithClient>>["ws"];
    createSessionDir: () => Promise<string>;
  }) => Promise<void>,
) {
  const tempDirs: string[] = [];
  const { server, ws } = await startServerWithClient();
  const createSessionDir = async () => {
    const sessionDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-gw-"));
    tempDirs.push(sessionDir);
    testState.sessionStorePath = path.join(sessionDir, "sessions.json");
    return sessionDir;
  };

  try {
    await run({ ws, createSessionDir });
  } finally {
    __setMaxChatHistoryMessagesBytesForTest();
    testState.sessionStorePath = undefined;
    ws.close();
    await server.close();
    await Promise.all(tempDirs.map((dir) => fs.rm(dir, { recursive: true, force: true })));
  }
}

async function writeMainSessionStore() {
  await writeSessionStore({
    entries: {
      main: { sessionId: "sess-main", updatedAt: Date.now() },
    },
  });
}

describe("gateway server chat", () => {
  test("smoke: caps history payload and preserves routing metadata", async () => {
    await withGatewayChatHarness(async ({ ws, createSessionDir }) => {
      const historyMaxBytes = 192 * 1024;
      __setMaxChatHistoryMessagesBytesForTest(historyMaxBytes);
      await connectOk(ws);

      const sessionDir = await createSessionDir();
      await writeMainSessionStore();

      const bigText = "x".repeat(4_000);
      const historyLines: string[] = [];
      for (let i = 0; i < 60; i += 1) {
        historyLines.push(
          JSON.stringify({
            message: {
              role: "user",
              content: [{ type: "text", text: `${i}:${bigText}` }],
              timestamp: Date.now() + i,
            },
          }),
        );
      }
      await fs.writeFile(
        path.join(sessionDir, "sess-main.jsonl"),
        historyLines.join("\n"),
        "utf-8",
      );

      const historyRes = await rpcReq<{ messages?: unknown[] }>(ws, "chat.history", {
        sessionKey: "main",
        limit: 1000,
      });
      expect(historyRes.ok).toBe(true);
      const messages = historyRes.payload?.messages ?? [];
      const bytes = Buffer.byteLength(JSON.stringify(messages), "utf8");
      expect(bytes).toBeLessThanOrEqual(historyMaxBytes);
      expect(messages.length).toBeLessThan(60);

      await writeSessionStore({
        entries: {
          main: {
            sessionId: "sess-main",
            updatedAt: Date.now(),
            lastChannel: "whatsapp",
            lastTo: "+1555",
          },
        },
      });

      const sendRes = await rpcReq(ws, "chat.send", {
        sessionKey: "main",
        message: "hello",
        idempotencyKey: "idem-route",
      });
      expect(sendRes.ok).toBe(true);

      const sessionStorePath = testState.sessionStorePath;
      if (!sessionStorePath) {
        throw new Error("expected session store path");
      }
      const stored = JSON.parse(await fs.readFile(sessionStorePath, "utf-8")) as Record<
        string,
        { lastChannel?: string; lastTo?: string } | undefined
      >;
      expect(stored["agent:main:main"]?.lastChannel).toBe("whatsapp");
      expect(stored["agent:main:main"]?.lastTo).toBe("+1555");
    });
  });

  test("chat.send does not force-disable block streaming", async () => {
    await withGatewayChatHarness(async ({ ws, createSessionDir }) => {
      const spy = getReplyFromConfig;
      await connectOk(ws);

      await createSessionDir();
      await writeMainSessionStore();
      testState.agentConfig = { blockStreamingDefault: "on" };
      try {
        spy.mockReset();
        let capturedOpts: GetReplyOptions | undefined;
        spy.mockImplementationOnce(async (_ctx: unknown, opts?: GetReplyOptions) => {
          capturedOpts = opts;
        });

        const sendRes = await rpcReq(ws, "chat.send", {
          sessionKey: "main",
          message: "hello",
          idempotencyKey: "idem-block-streaming",
        });
        expect(sendRes.ok).toBe(true);

        await vi.waitFor(
          () => {
            expect(spy.mock.calls.length).toBeGreaterThan(0);
          },
          { timeout: 2_000, interval: 10 },
        );

        expect(capturedOpts?.disableBlockStreaming).toBeUndefined();
      } finally {
        testState.agentConfig = undefined;
      }
    });
  });

  test("chat.history hard-caps single oversized nested payloads", async () => {
    await withGatewayChatHarness(async ({ ws, createSessionDir }) => {
      const historyMaxBytes = 64 * 1024;
      __setMaxChatHistoryMessagesBytesForTest(historyMaxBytes);
      await connectOk(ws);

      const sessionDir = await createSessionDir();
      await writeMainSessionStore();

      const hugeNestedText = "n".repeat(450_000);
      const oversizedLine = JSON.stringify({
        message: {
          role: "assistant",
          timestamp: Date.now(),
          content: [
            {
              type: "tool_result",
              toolUseId: "tool-1",
              output: {
                nested: {
                  payload: hugeNestedText,
                },
              },
            },
          ],
        },
      });
      await fs.writeFile(path.join(sessionDir, "sess-main.jsonl"), `${oversizedLine}\n`, "utf-8");

      const historyRes = await rpcReq<{ messages?: unknown[] }>(ws, "chat.history", {
        sessionKey: "main",
        limit: 1000,
      });
      expect(historyRes.ok).toBe(true);
      const messages = historyRes.payload?.messages ?? [];
      expect(messages.length).toBe(1);

      const serialized = JSON.stringify(messages);
      const bytes = Buffer.byteLength(serialized, "utf8");
      expect(bytes).toBeLessThanOrEqual(historyMaxBytes);
      expect(serialized).toContain("[chat.history omitted: message too large]");
      expect(serialized.includes(hugeNestedText.slice(0, 256))).toBe(false);
    });
  });

  test("chat.history keeps recent small messages when latest message is oversized", async () => {
    await withGatewayChatHarness(async ({ ws, createSessionDir }) => {
      const historyMaxBytes = 64 * 1024;
      __setMaxChatHistoryMessagesBytesForTest(historyMaxBytes);
      await connectOk(ws);

      const sessionDir = await createSessionDir();
      await writeMainSessionStore();

      const baseText = "s".repeat(1_200);
      const lines: string[] = [];
      for (let i = 0; i < 30; i += 1) {
        lines.push(
          JSON.stringify({
            message: {
              role: "user",
              timestamp: Date.now() + i,
              content: [{ type: "text", text: `small-${i}:${baseText}` }],
            },
          }),
        );
      }

      const hugeNestedText = "z".repeat(450_000);
      lines.push(
        JSON.stringify({
          message: {
            role: "assistant",
            timestamp: Date.now() + 1_000,
            content: [
              {
                type: "tool_result",
                toolUseId: "tool-1",
                output: {
                  nested: {
                    payload: hugeNestedText,
                  },
                },
              },
            ],
          },
        }),
      );

      await fs.writeFile(
        path.join(sessionDir, "sess-main.jsonl"),
        `${lines.join("\n")}\n`,
        "utf-8",
      );

      const historyRes = await rpcReq<{ messages?: unknown[] }>(ws, "chat.history", {
        sessionKey: "main",
        limit: 1000,
      });
      expect(historyRes.ok).toBe(true);

      const messages = historyRes.payload?.messages ?? [];
      const serialized = JSON.stringify(messages);
      const bytes = Buffer.byteLength(serialized, "utf8");

      expect(bytes).toBeLessThanOrEqual(historyMaxBytes);
      expect(messages.length).toBeGreaterThan(1);
      expect(serialized).toContain("small-29:");
      expect(serialized).toContain("[chat.history omitted: message too large]");
      expect(serialized.includes(hugeNestedText.slice(0, 256))).toBe(false);
    });
  });

  test("smoke: supports abort and idempotent completion", async () => {
    await withGatewayChatHarness(async ({ ws, createSessionDir }) => {
      const spy = getReplyFromConfig;
      let aborted = false;
      await connectOk(ws);

      await createSessionDir();
      await writeMainSessionStore();

      spy.mockReset();
      spy.mockImplementationOnce(async (_ctx, opts) => {
        opts?.onAgentRunStart?.(opts.runId ?? "idem-abort-1");
        const signal = opts?.abortSignal;
        await new Promise<void>((resolve) => {
          if (!signal || signal.aborted) {
            aborted = Boolean(signal?.aborted);
            resolve();
            return;
          }
          signal.addEventListener(
            "abort",
            () => {
              aborted = true;
              resolve();
            },
            { once: true },
          );
        });
      });

      const sendResP = onceMessage(ws, (o) => o.type === "res" && o.id === "send-abort-1", 8_000);
      sendReq(ws, "send-abort-1", "chat.send", {
        sessionKey: "main",
        message: "hello",
        idempotencyKey: "idem-abort-1",
        timeoutMs: 30_000,
      });

      const sendRes = await sendResP;
      expect(sendRes.ok).toBe(true);
      await vi.waitFor(
        () => {
          expect(spy.mock.calls.length).toBeGreaterThan(0);
        },
        { timeout: 2_000, interval: 10 },
      );

      const inFlight = await rpcReq<{ status?: string }>(ws, "chat.send", {
        sessionKey: "main",
        message: "hello",
        idempotencyKey: "idem-abort-1",
      });
      expect(inFlight.ok).toBe(true);
      expect(["started", "in_flight", "ok"]).toContain(inFlight.payload?.status ?? "");

      const abortRes = await rpcReq<{ aborted?: boolean }>(ws, "chat.abort", {
        sessionKey: "main",
        runId: "idem-abort-1",
      });
      expect(abortRes.ok).toBe(true);
      expect(abortRes.payload?.aborted).toBe(true);
      await vi.waitFor(
        () => {
          expect(aborted).toBe(true);
        },
        { timeout: 2_000, interval: 10 },
      );

      spy.mockReset();
      spy.mockResolvedValueOnce(undefined);

      const completeRes = await rpcReq<{ status?: string }>(ws, "chat.send", {
        sessionKey: "main",
        message: "hello",
        idempotencyKey: "idem-complete-1",
      });
      expect(completeRes.ok).toBe(true);

      await vi.waitFor(
        async () => {
          const again = await rpcReq<{ status?: string }>(ws, "chat.send", {
            sessionKey: "main",
            message: "hello",
            idempotencyKey: "idem-complete-1",
          });
          expect(again.ok).toBe(true);
          expect(again.payload?.status).toBe("ok");
        },
        { timeout: 2_000, interval: 10 },
      );
    });
  });
});