import { Router } from "@oak/oak";
import { db } from "../config/database.ts";
import { authenticateToken } from "../middleware/auth.ts";

const router = new Router();

interface Activity {
  id: number;
  sub_department_id: number;
  name: string;
  unit_of_measurement: string;
  created_at: string;
  sub_department_name?: string;
  department_id?: number;
  department_name?: string;
}

// Get all activities (with optional filters)
router.get("/", authenticateToken, async (ctx) => {
  try {
    const params = ctx.request.url.searchParams;
    const subDepartmentId = params.get("subDepartmentId");
    const departmentId = params.get("departmentId");
    
    let query = `
      SELECT a.id, a.sub_department_id, a.name, a.unit_of_measurement, a.created_at,
             sd.name as sub_department_name,
             sd.department_id,
             d.name as department_name
      FROM activities a
      JOIN sub_departments sd ON a.sub_department_id = sd.id
      JOIN departments d ON sd.department_id = d.id
      WHERE 1=1
    `;
    const queryParams: unknown[] = [];
    
    if (subDepartmentId) {
      query += " AND a.sub_department_id = ?";
      queryParams.push(subDepartmentId);
    }
    
    if (departmentId) {
      query += " AND sd.department_id = ?";
      queryParams.push(departmentId);
    }
    
    query += " ORDER BY d.name, sd.name, a.name";
    
    const activities = await db.query<Activity[]>(query, queryParams);
    ctx.response.body = activities;
  } catch (error) {
    console.error("Get activities error:", error);
    ctx.response.status = 500;
    ctx.response.body = { error: "Internal server error" };
  }
});

// Get activity by ID
router.get("/:id", authenticateToken, async (ctx) => {
  try {
    const activityId = ctx.params.id;
    
    const activities = await db.query<Activity[]>(
      `SELECT a.id, a.sub_department_id, a.name, a.unit_of_measurement, a.created_at,
              sd.name as sub_department_name,
              sd.department_id,
              d.name as department_name
       FROM activities a
       JOIN sub_departments sd ON a.sub_department_id = sd.id
       JOIN departments d ON sd.department_id = d.id
       WHERE a.id = ?`,
      [activityId]
    );
    
    if (activities.length === 0) {
      ctx.response.status = 404;
      ctx.response.body = { error: "Activity not found" };
      return;
    }
    
    ctx.response.body = activities[0];
  } catch (error) {
    console.error("Get activity error:", error);
    ctx.response.status = 500;
    ctx.response.body = { error: "Internal server error" };
  }
});

// Create activity (SuperAdmin only)
router.post("/", authenticateToken, async (ctx) => {
  try {
    const body = await ctx.request.body.json();
    const { sub_department_id, name, unit_of_measurement } = body;
    
    if (!sub_department_id || !name) {
      ctx.response.status = 400;
      ctx.response.body = { error: "Sub-department ID and name are required" };
      return;
    }
    
    const result = await db.execute(
      "INSERT INTO activities (sub_department_id, name, unit_of_measurement) VALUES (?, ?, ?)",
      [sub_department_id, name, unit_of_measurement || "Per Bag"]
    );
    
    ctx.response.status = 201;
    ctx.response.body = { 
      id: result.lastInsertId, 
      message: "Activity created successfully" 
    };
  } catch (error) {
    console.error("Create activity error:", error);
    ctx.response.status = 500;
    ctx.response.body = { error: "Internal server error" };
  }
});

// Update activity
router.put("/:id", authenticateToken, async (ctx) => {
  try {
    const activityId = ctx.params.id;
    const body = await ctx.request.body.json();
    const { name, unit_of_measurement } = body;
    
    await db.execute(
      "UPDATE activities SET name = ?, unit_of_measurement = ? WHERE id = ?",
      [name, unit_of_measurement, activityId]
    );
    
    ctx.response.body = { message: "Activity updated successfully" };
  } catch (error) {
    console.error("Update activity error:", error);
    ctx.response.status = 500;
    ctx.response.body = { error: "Internal server error" };
  }
});

// Delete activity
router.delete("/:id", authenticateToken, async (ctx) => {
  try {
    const activityId = ctx.params.id;
    
    await db.execute("DELETE FROM activities WHERE id = ?", [activityId]);
    
    ctx.response.body = { message: "Activity deleted successfully" };
  } catch (error) {
    console.error("Delete activity error:", error);
    ctx.response.status = 500;
    ctx.response.body = { error: "Internal server error" };
  }
});

export default router;