/**
 * @fileoverview Transaction listing endpoints for Aurora API.
 * Provides read access to economy transaction history.
 */

import type { RouteContext, RouteModule } from "./types";
import { jsonResponse, withErrorHandling } from "./utils";

/**
 * Transactions routes handler.
 * 
 * Endpoints:
 * - GET /api/transactions - List transactions with filters
 */
async function handler(ctx: RouteContext): Promise<Response | null> {
    const { pathname, method, url } = ctx;

    /**
     * @route GET /api/transactions
     * @description Returns economy transactions with optional filtering.
     * 
     * @query userId - Filter by user ID (Discord snowflake)
     * @query type - Filter by transaction type
     * @query limit - Max results (default: 50)
     * @query offset - Pagination offset (default: 0)
     * 
     * @response 200 - `{ transactions: Transaction[] }`
     * @response 500 - Error fetching transactions
     * 
     * Transaction Types:
     * - DAILY_REWARD - Daily claim reward
     * - TRANSFER_IN - Received from another user
     * - TRANSFER_OUT - Sent to another user
     * - LOOTDROP_CLAIM - Claimed lootdrop
     * - SHOP_BUY - Item purchase
     * - QUEST_REWARD - Quest completion reward
     * 
     * @example
     * // Request
     * GET /api/transactions?userId=123456789&type=DAILY_REWARD&limit=10
     * 
     * // Response
     * {
     *   "transactions": [
     *     {
     *       "id": "1",
     *       "userId": "123456789",
     *       "amount": "100",
     *       "type": "DAILY_REWARD",
     *       "description": "Daily reward (Streak: 3)",
     *       "createdAt": "2024-01-15T12:00:00Z"
     *     }
     *   ]
     * }
     */
    if (pathname === "/api/transactions" && method === "GET") {
        return withErrorHandling(async () => {
            const { transactions } = await import("@shared/db/schema");
            const { DrizzleClient } = await import("@shared/db/DrizzleClient");
            const { eq, desc } = await import("drizzle-orm");

            const userId = url.searchParams.get("userId");
            const type = url.searchParams.get("type");
            const limit = url.searchParams.get("limit") ? parseInt(url.searchParams.get("limit")!) : 50;
            const offset = url.searchParams.get("offset") ? parseInt(url.searchParams.get("offset")!) : 0;

            let query = DrizzleClient.select().from(transactions);

            if (userId) {
                query = query.where(eq(transactions.userId, BigInt(userId))) as typeof query;
            }
            if (type) {
                query = query.where(eq(transactions.type, type)) as typeof query;
            }

            const result = await query
                .orderBy(desc(transactions.createdAt))
                .limit(limit)
                .offset(offset);

            return jsonResponse({ transactions: result });
        }, "fetch transactions");
    }

    return null;
}

export const transactionsRoutes: RouteModule = {
    name: "transactions",
    handler
};