import { describe, expect, test } from "vitest";
import type { ThreadEvent } from "@openai/codex-sdk";
import { CodexSdkRunner } from "../src/codex-runner.js";
import type { AgentInvocation, AgentInvocationResult, InvocationArtifacts, ProgressEvent, RoleConfig } from "../src/types.js";

type FakeRunPlan = {
  events?: ThreadEvent[];
  error?: Error;
};

class FakeThread {
  constructor(
    public readonly id: string | null,
    private readonly plans: FakeRunPlan[],
    private readonly calls: Array<{ input: string; outputSchema?: unknown }>,
  ) {}

  async runStreamed(input: string, turnOptions?: { outputSchema?: unknown }): Promise<{ events: AsyncGenerator<ThreadEvent> }> {
    this.calls.push({ input, outputSchema: turnOptions?.outputSchema });
    const plan = this.plans.shift();
    if (!plan) {
      throw new Error("Unexpected runStreamed call");
    }
    if (plan.error) {
      throw plan.error;
    }
    return {
      events: this.generateEvents(plan.events ?? []),
    };
  }

  private async *generateEvents(events: ThreadEvent[]): AsyncGenerator<ThreadEvent> {
    for (const event of events) {
      yield event;
    }
  }
}

class FakeCodex {
  readonly calls: Array<{ input: string; outputSchema?: unknown }> = [];

  constructor(private readonly plans: FakeRunPlan[]) {}

  startThread(): FakeThread {
    return new FakeThread("thread-started", this.plans, this.calls);
  }

  resumeThread(threadId: string): FakeThread {
    return new FakeThread(threadId, this.plans, this.calls);
  }
}

function buildArtifacts(): InvocationArtifacts {
  return {
    promptPath: "/tmp/prompt.json",
    schemaPath: "/tmp/schema.json",
    rawEventsPath: "/tmp/raw-events.jsonl",
    stderrPath: "/tmp/stderr.log",
    lastMessagePath: "/tmp/last-message.json",
    responsePath: "/tmp/response.json",
  };
}

function buildRoleConfig(): RoleConfig {
  return {
    sandbox: "read-only",
    search: false,
    skipGitRepoCheck: false,
    extraArgs: [],
  };
}

function buildRequest(onProgress?: (event: ProgressEvent) => void | Promise<void>): AgentInvocation<{ summary: string }> {
  return {
    runId: "run-1",
    role: "strategy",
    sessionId: null,
    prompt: "Summarize status",
    schemaName: "summary",
    schema: {
      type: "object",
      properties: {
        summary: { type: "string" },
      },
      required: ["summary"],
      additionalProperties: false,
    },
    cwd: "/tmp",
    roleConfig: buildRoleConfig(),
    artifacts: buildArtifacts(),
    onProgress,
  };
}

describe("CodexSdkRunner", () => {
  test("continues past transient reconnect stream errors", async () => {
    const progressEvents: ProgressEvent[] = [];
    const runner = new CodexSdkRunner("codex", new FakeCodex([
      {
        events: [
          {
            type: "thread.started",
            thread_id: "thread-1",
          },
          {
            type: "error",
            message: "Reconnecting... 2/12 (stream disconnected before completion: idle timeout waiting for websocket)",
          },
          {
            type: "item.completed",
            item: {
              id: "message-1",
              type: "agent_message",
              text: JSON.stringify({ summary: "Recovered after reconnect." }),
            },
          },
          {
            type: "turn.completed",
            usage: {
              input_tokens: 10,
              cached_input_tokens: 0,
              output_tokens: 5,
            },
          },
        ],
      },
    ]));

    const result = await runner.invoke(buildRequest((event) => {
      progressEvents.push(event);
    }));

    expect(result.output.summary).toBe("Recovered after reconnect.");
    expect(result.sessionId).toBe("thread-1");
    expect(progressEvents.some((event) => event.kind === "stream.error")).toBe(true);
  });

  test("falls back to prompt-embedded schema for unsupported dynamic object keys", async () => {
    const codex = new FakeCodex([
      {
        events: [
          {
            type: "thread.started",
            thread_id: "thread-1",
          },
          {
            type: "item.completed",
            item: {
              id: "message-1",
              type: "agent_message",
              text: JSON.stringify({
                summary: "Captured metrics.",
                metrics: {
                  latency_ms: 12,
                },
              }),
            },
          },
          {
            type: "turn.completed",
            usage: {
              input_tokens: 10,
              cached_input_tokens: 0,
              output_tokens: 5,
            },
          },
        ],
      },
    ]);
    const runner = new CodexSdkRunner("codex", codex);

    const result = await runner.invoke({
      ...buildRequest(),
      schema: {
        type: "object",
        properties: {
          summary: { type: "string" },
          metrics: {
            type: "object",
            additionalProperties: {
              type: "number",
            },
          },
        },
        required: ["summary", "metrics"],
        additionalProperties: false,
      },
    });

    expect(result.output).toEqual({
      summary: "Captured metrics.",
      metrics: {
        latency_ms: 12,
      },
    });
    expect(codex.calls).toHaveLength(1);
    expect(codex.calls[0]?.outputSchema).toBeUndefined();
    expect(codex.calls[0]?.input).toContain("Structured output enforcement is unavailable");
    expect(codex.calls[0]?.input).toContain("\"metrics\"");
  });

  test("retries without outputSchema after invalid_json_schema errors", async () => {
    const codex = new FakeCodex([
      {
        error: new Error(
          "Invalid schema for response_format 'codex_output_schema': invalid_json_schema at text.format.schema",
        ),
      },
      {
        events: [
          {
            type: "thread.started",
            thread_id: "thread-1",
          },
          {
            type: "item.completed",
            item: {
              id: "message-1",
              type: "agent_message",
              text: JSON.stringify({ summary: "Recovered after schema fallback." }),
            },
          },
          {
            type: "turn.completed",
            usage: {
              input_tokens: 10,
              cached_input_tokens: 0,
              output_tokens: 5,
            },
          },
        ],
      },
    ]);
    const runner = new CodexSdkRunner("codex", codex);

    const result = await runner.invoke(buildRequest());

    expect(result.output.summary).toBe("Recovered after schema fallback.");
    expect(codex.calls).toHaveLength(2);
    expect(codex.calls[0]?.outputSchema).toBeDefined();
    expect(codex.calls[1]?.outputSchema).toBeUndefined();
    expect(codex.calls[1]?.input).toContain("Structured output enforcement is unavailable");
    expect(codex.calls[1]?.input).toContain("\"summary\"");
  });

  test("falls back when required does not match the declared properties", async () => {
    const codex = new FakeCodex([
      {
        events: [
          {
            type: "thread.started",
            thread_id: "thread-1",
          },
          {
            type: "item.completed",
            item: {
              id: "message-1",
              type: "agent_message",
              text: JSON.stringify({
                summary: "Normalized required keys.",
                status: "ok",
              }),
            },
          },
          {
            type: "turn.completed",
            usage: {
              input_tokens: 10,
              cached_input_tokens: 0,
              output_tokens: 5,
            },
          },
        ],
      },
    ]);
    const runner = new CodexSdkRunner("codex", codex);

    await runner.invoke({
      ...buildRequest(),
      schema: {
        type: "object",
        properties: {
          summary: { type: "string" },
          status: { type: "string" },
        },
        required: ["summary"],
        additionalProperties: false,
      },
    });

    expect(codex.calls).toHaveLength(1);
    expect(codex.calls[0]?.outputSchema).toBeUndefined();
    expect(codex.calls[0]?.input).toContain("Structured output enforcement is unavailable");
    expect(codex.calls[0]?.input).toContain("\"status\"");
  });

  test("still fails on non-transient stream errors", async () => {
    const runner = new CodexSdkRunner("codex", new FakeCodex([
      {
        events: [
          {
            type: "thread.started",
            thread_id: "thread-1",
          },
          {
            type: "error",
            message: "Fatal websocket failure",
          },
        ],
      },
    ]));

    await expect(runner.invoke(buildRequest())).rejects.toThrow("Fatal websocket failure");
  });
});