import {
  APIGatewayProxyEvent,
  APIGatewayProxyResult,
  SQSEvent,
} from "aws-lambda";
import { SQSClient, SendMessageCommand } from "@aws-sdk/client-sqs";
import { handler as indexSubredditHandler } from "./sqs-index.js";
import { createMockSQSEvent, ProcessTask } from "@microfox/tool-core";
import { ragSubredditPaginator } from "../helpers/ragRedis.js";

const sqsClient = new SQSClient({});
const isOffline = process.env.IS_OFFLINE === "true";

export const handler = async (
  event: APIGatewayProxyEvent
): Promise<APIGatewayProxyResult> => {
  console.log("handler: sqs-trigger-subreddit", {
    isOffline,
    body: event.body,
  });

  const taskHandler = new ProcessTask({
    url: process.env.TASK_UPSTASH_REDIS_REST_URL,
    token: process.env.TASK_UPSTASH_REDIS_REST_TOKEN,
  });

  if (!event.body) {
    console.log("handler: missing request body");
    return {
      statusCode: 400,
      body: JSON.stringify({ message: "Missing request body" }),
    };
  }

  try {
    console.log("handler: parsing request body");
    const { subreddit } = JSON.parse(event.body);
    console.log("handler: parsed request body", { subreddit });
    if (!subreddit) {
      console.log("handler: missing subreddit in request body");
      return {
        statusCode: 400,
        body: JSON.stringify({ message: "Missing subreddit in request body" }),
      };
    }

    if (!process.env.INDEX_SUBREDDIT_QUEUE_URL && !isOffline) {
      console.error("INDEX_SUBREDDIT_QUEUE_URL is not set");
      return {
        statusCode: 500,
        body: JSON.stringify({
          message: "Internal server error: Queue not configured",
        }),
      };
    }

    // TODO: get the subreddit info
    // TODO: store/update it in db

    const task = await taskHandler.createTask({
      subreddit,
    });

    console.log("handler: preparing SQS message");
    const authHeader = event.headers["x-auth-secrets"];
    const sqsMessageBody = { subreddit, xAuthSecrets: authHeader, task_id: task.id};
    console.log("handler: prepared SQS message", { sqsMessageBody });

    console.log("handler: checking if subreddit is stale", { subreddit });
    const isStale = await ragSubredditPaginator(subreddit).isStale(60 * 60);
    console.log("handler: checked if subreddit is stale", { isStale });

    if (!isStale) {
      console.log("handler: subreddit already indexed in the last hour");
      return {
        statusCode: 202,
        body: JSON.stringify({
          message: "Subreddit already indexed in the last hour",
        }),
      };
    }

    if (isOffline) {
      console.log(
        "handler: running in offline mode, invoking handler directly"
      );
      const sqsEvent = createMockSQSEvent(sqsMessageBody);
      indexSubredditHandler(sqsEvent);
      console.log("handler: invoked handler directly");
    } else {
      console.log("handler: sending message to SQS", {
        queueUrl: process.env.INDEX_SUBREDDIT_QUEUE_URL,
      });
      const command = new SendMessageCommand({
        QueueUrl: process.env.INDEX_SUBREDDIT_QUEUE_URL,
        MessageBody: JSON.stringify(sqsMessageBody),
      });

      await sqsClient.send(command);
      console.log("handler: sent message to SQS");
    }

    console.log("handler: finished successfully");
    return {
      statusCode: 202,
      body: JSON.stringify({
        message: "Subreddit indexing triggered successfully",
      }),
    };
  } catch (error) {
    console.error(error);
    if (error instanceof SyntaxError) {
      console.log("handler: invalid JSON in request body");
      return {
        statusCode: 400,
        body: JSON.stringify({ message: "Invalid JSON in request body" }),
      };
    }
    console.log("handler: internal server error");
    return {
      statusCode: 500,
      body: JSON.stringify({ message: "Internal server error" }),
    };
  }
};

export const handleApiRequestDocs = {
  summary: "Trigger subreddit indexing",
  description:
    "Triggers the indexing of a specific subreddit by sending a message to the SQS queue.",
  tags: ["Subreddit"],
  requestBody: {
    required: true,
    content: {
      "application/json": {
        schema: {
          type: "object",
          properties: {
            subreddit: {
              type: "string",
              description: "The name of the subreddit to index.",
            },
          },
          required: ["subreddit"],
        },
      },
    },
  },
  responses: {
    "202": {
      description:
        "Accepted: The indexing request has been successfully queued.",
    },
    "400": { description: "Bad Request: Missing or invalid request body." },
    "500": { description: "Internal server error." },
  },
};