feat: complete day 2

.gitignore

@@ -1,2 +1,13 @@
 node_modules
 package-lock.json
+.env
+
+# Environment variables in day projects
+day*/.env
+day*/.env.*    
+day*/**/.env    
+
+# Node modules in day projects
+day*/node_modules/
+
+day*/package-lock.json

day1/.env

@@ -1,2 +0,0 @@
-DB_PASSWORD=ayobamidavid
-PORT=8000

day1/routes/shippingDock.js

@@ -38,7 +38,7 @@ router.post("/", async (req, res) => {
       return handleError("Name is required and cannot be empty", 400, res);
     }
     await ShippingDock.create(req.body);
-    handleSuccess(res, dock, 201);
+    handleSuccess(res, null, 201);
   } catch (err) {
     handleError(err.message, 500, res);
   }
@@ -85,7 +85,7 @@ router.delete("/:id", async (req, res) => {
       where: { id: req.params.id },
     });
     if (deleted === 0) return handleError("Dock not found", 404, res);
-    handleSuccess(res, null, 204); // 204 No Content
+    handleSuccess(res, null);
   } catch (err) {
     handleSequelizeError(err, res);
   }

day2/models/order.js

@@ -0,0 +1,43 @@
+module.exports = (sequelize, DataTypes) => {
+  const order = sequelize.define(
+    "order",
+    {
+      id: {
+        type: DataTypes.INTEGER,
+        primaryKey: true,
+        autoIncrement: true,
+      },
+      user_id: {
+        type: DataTypes.INTEGER,
+        allowNull: false,
+      },
+      shipping_dock_id: {
+        type: DataTypes.INTEGER,
+        allowNull: false,
+      },
+      amount: {
+        type: DataTypes.DECIMAL(10, 2),
+        allowNull: false,
+      },
+      status: {
+        type: DataTypes.STRING,
+        defaultValue: "pending",
+      },
+      created_at: {
+        type: DataTypes.DATE,
+        defaultValue: DataTypes.NOW,
+      },
+      updated_at: {
+        type: DataTypes.DATE,
+        defaultValue: DataTypes.NOW,
+      },
+    },
+    {
+      timestamps: true,
+      freezeTableName: true,
+      tableName: "order",
+    }
+  );
+
+  return order;
+};

day2/routes/orders.js

@@ -0,0 +1,55 @@
+const express = require("express");
+const router = express.Router();
+const db = require("../models");
+const PaginationService = require("../services/PaginationService");
+const ReportService = require("../services/ReportService");
+
+// GET /api/v1/order/odd - Return all odd order_id rows
+router.get("/odd", async (req, res) => {
+  try {
+    const oddOrders = await PaginationService.getOddOrders(db.order);
+    res.json(oddOrders);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// GET /api/v1/order - Paginate orders with optional sorting
+router.get("/", async (req, res) => {
+  try {
+    const { page = 1, limit = 10, sort = "id", direction = "ASC" } = req.query;
+
+    const result = await PaginationService.paginateWithSort(db.order, {
+      page,
+      limit,
+      sort,
+      direction,
+    });
+
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// GET /api/v1/order/cursor - Cursor-based pagination
+router.get("/cursor", async (req, res) => {
+  try {
+    const { id, limit = 10 } = req.query;
+
+    if (!id) {
+      return res.status(400).json({ error: "id parameter is required" });
+    }
+
+    const result = await PaginationService.paginateWithCursor(db.order, {
+      id,
+      limit,
+    });
+
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+module.exports = router;

day2/routes/reports.js

@@ -0,0 +1,93 @@
+const express = require("express");
+const router = express.Router();
+const db = require("../models");
+const ReportService = require("../services/ReportService");
+
+// GET /api/v1/report/sale?month=1&year=2022
+router.get("/sale", async (req, res) => {
+  try {
+    const { month, year, from_date, to_date } = req.query;
+    if (month && year) {
+      const result = await ReportService.getMonthlySales(db.order, month, year);
+      return res.json(result);
+    } else if (from_date && to_date) {
+      const result = await ReportService.getSalesByDateRange(
+        db.order,
+        from_date,
+        to_date
+      );
+      return res.json(result);
+    } else {
+      return res.status(400).json({ error: "Missing required parameters" });
+    }
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// GET /api/v1/report/monthly?year=2022
+router.get("/monthly", async (req, res) => {
+  try {
+    const { year } = req.query;
+    if (!year) return res.status(400).json({ error: "year is required" });
+    const result = await ReportService.getMonthlySalesByYear(db.order, year);
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// GET /api/v1/report/user?year=2022&user_id=1
+router.get("/user", async (req, res) => {
+  try {
+    const { year, user_id } = req.query;
+    if (!year || !user_id)
+      return res.status(400).json({ error: "year and user_id are required" });
+    const result = await ReportService.getMonthlySalesByUser(
+      db.order,
+      year,
+      user_id
+    );
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// GET /api/v1/report/shipping_dock?year=2022&shipping_dock_id=1
+router.get("/shipping_dock", async (req, res) => {
+  try {
+    const { year, shipping_dock_id } = req.query;
+    if (!year || !shipping_dock_id)
+      return res
+        .status(400)
+        .json({ error: "year and shipping_dock_id are required" });
+    const result = await ReportService.getMonthlySalesByShippingDock(
+      db.order,
+      year,
+      shipping_dock_id
+    );
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// GET /api/v1/report/user/count?year=2022&user_id=1
+router.get("/user/count", async (req, res) => {
+  try {
+    const { year, user_id } = req.query;
+    if (!year || !user_id)
+      return res.status(400).json({ error: "year and user_id are required" });
+    const result = await ReportService.getOrderCountByUser(
+      db.order,
+      year,
+      user_id
+    );
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+module.exports = router;

day2/services/PaginationService.js

@@ -0,0 +1,82 @@
+const { Op } = require("sequelize");
+
+class PaginationService {
+  /**
+   * Handle offset-based pagination with sorting
+   */
+  static async paginateWithSort(model, options = {}) {
+    const {
+      page = 1,
+      limit = 10,
+      sort = "id",
+      direction = "ASC",
+      where = {},
+    } = options;
+
+    const offset = (page - 1) * limit;
+    const order = [[sort, direction.toUpperCase()]];
+
+    const { count, rows } = await model.findAndCountAll({
+      where,
+      order,
+      limit: parseInt(limit),
+      offset: parseInt(offset),
+    });
+
+    const totalPages = Math.ceil(count / limit);
+
+    return {
+      total: count,
+      page: parseInt(page),
+      totalPages,
+      list: rows,
+    };
+  }
+
+  /**
+   * Handle cursor-based pagination
+   */
+  static async paginateWithCursor(model, options = {}) {
+    const {
+      id,
+      limit = 10,
+      sort = "id",
+      direction = "ASC",
+      where = {},
+    } = options;
+
+    const order = [[sort, direction.toUpperCase()]];
+    const cursorWhere = {
+      ...where,
+      [sort]: {
+        [direction.toUpperCase() === "ASC" ? Op.gt : Op.lt]: id,
+      },
+    };
+
+    const rows = await model.findAll({
+      where: cursorWhere,
+      order,
+      limit: parseInt(limit),
+    });
+
+    return {
+      id: parseInt(id),
+      list: rows,
+    };
+  }
+
+  /**
+   * Get odd order IDs
+   */
+  static async getOddOrders(model) {
+    return await model.findAll({
+      where: {
+        id: {
+          [Op.mod]: [2, 1], // id % 2 = 1 (odd numbers)
+        },
+      },
+    });
+  }
+}
+
+module.exports = PaginationService;

day2/services/ReportService.js

@@ -0,0 +1,169 @@
+const { Op, fn, col, literal } = require("sequelize");
+
+class ReportService {
+  /**
+   * Get total sales for a specific month and year
+   */
+  static async getMonthlySales(model, month, year) {
+    const result = await model.findOne({
+      attributes: [[fn("SUM", col("amount")), "total_amount"]],
+      where: {
+        created_at: {
+          [Op.and]: [
+            literal(`MONTH(created_at) = ${month}`),
+            literal(`YEAR(created_at) = ${year}`),
+          ],
+        },
+      },
+    });
+
+    return {
+      month: parseInt(month),
+      year: parseInt(year),
+      total_amount: parseFloat(result?.dataValues?.total_amount || 0),
+    };
+  }
+
+  /**
+   * Get total sales for a date range
+   */
+  static async getSalesByDateRange(model, fromDate, toDate) {
+    // Ensure dates are in correct order
+    const startDate = new Date(fromDate) < new Date(toDate) ? fromDate : toDate;
+    const endDate = new Date(fromDate) < new Date(toDate) ? toDate : fromDate;
+
+    const result = await model.findOne({
+      attributes: [[fn("SUM", col("amount")), "total_amount"]],
+      where: {
+        created_at: {
+          [Op.between]: [startDate, endDate],
+        },
+      },
+    });
+
+    return {
+      from_date: startDate,
+      to_date: endDate,
+      total_amount: parseFloat(result?.dataValues?.total_amount || 0),
+    };
+  }
+
+  /**
+   * Get monthly sales for a year (only months with sales > 0)
+   */
+  static async getMonthlySalesByYear(model, year) {
+    const results = await model.findAll({
+      attributes: [
+        [fn("MONTH", col("created_at")), "month"],
+        [fn("SUM", col("amount")), "total_amount"],
+      ],
+      where: {
+        created_at: {
+          [Op.and]: [literal(`YEAR(created_at) = ${year}`)],
+        },
+      },
+      group: [fn("MONTH", col("created_at"))],
+      having: literal("SUM(amount) > 0"),
+      order: [[fn("MONTH", col("created_at")), "ASC"]],
+    });
+
+    return results.map((result) => ({
+      month: parseInt(result.dataValues.month),
+      total_amount: parseFloat(result.dataValues.total_amount),
+    }));
+  }
+
+  /**
+   * Get monthly sales for a year by user_id (only months with sales > 0)
+   */
+  static async getMonthlySalesByUser(model, year, userId) {
+    const results = await model.findAll({
+      attributes: [
+        [fn("MONTH", col("created_at")), "month"],
+        [fn("SUM", col("amount")), "total_amount"],
+      ],
+      where: {
+        created_at: {
+          [Op.and]: [literal(`YEAR(created_at) = ${year}`)],
+        },
+        user_id: userId,
+      },
+      group: [fn("MONTH", col("created_at"))],
+      having: literal("SUM(amount) > 0"),
+      order: [[fn("MONTH", col("created_at")), "ASC"]],
+    });
+
+    return results.map((result) => ({
+      month: parseInt(result.dataValues.month),
+      total_amount: parseFloat(result.dataValues.total_amount),
+    }));
+  }
+
+  /**
+   * Get monthly sales for a year by shipping_dock_id (only months with sales > 0)
+   */
+  static async getMonthlySalesByShippingDock(model, year, shippingDockId) {
+    const results = await model.findAll({
+      attributes: [
+        [fn("MONTH", col("created_at")), "month"],
+        [fn("SUM", col("amount")), "total_amount"],
+      ],
+      where: {
+        created_at: {
+          [Op.and]: [literal(`YEAR(created_at) = ${year}`)],
+        },
+        shipping_dock_id: shippingDockId,
+      },
+      group: [fn("MONTH", col("created_at"))],
+      having: literal("SUM(amount) > 0"),
+      order: [[fn("MONTH", col("created_at")), "ASC"]],
+    });
+
+    return results.map((result) => ({
+      month: parseInt(result.dataValues.month),
+      total_amount: parseFloat(result.dataValues.total_amount),
+    }));
+  }
+
+  /**
+   * Get order count per month for a user in a year (include months with 0 orders)
+   */
+  static async getOrderCountByUser(model, year, userId) {
+    // First get all months with orders
+    const orderMonths = await model.findAll({
+      attributes: [
+        [fn("MONTH", col("created_at")), "month"],
+        [fn("COUNT", col("id")), "order_count"],
+      ],
+      where: {
+        created_at: {
+          [Op.and]: [literal(`YEAR(created_at) = ${year}`)],
+        },
+        user_id: userId,
+      },
+      group: [fn("MONTH", col("created_at"))],
+      order: [[fn("MONTH", col("created_at")), "ASC"]],
+    });
+
+    // Create a map of months with orders
+    const monthMap = {};
+    orderMonths.forEach((result) => {
+      monthMap[parseInt(result.dataValues.month)] = parseInt(
+        result.dataValues.order_count
+      );
+    });
+
+    // Create result array with all 12 months
+    const result = [];
+    for (let month = 1; month <= 12; month++) {
+      result.push({
+        month,
+        order_count: monthMap[month] || 0,
+      });
+    }
+
+    return result;
+  }
+}
+
+module.exports = ReportService;