import { NextRequest, NextResponse } from 'next/server';
import { z } from 'zod';
import { AuthError, requireHRD } from '@/lib/auth/session';
import {
  getEmployeeTargetForOrganization,
  upsertEmployeeTargetForOrganization
} from '@/features/employee-directory/server/employee-directory-data';

const targetSchema = z
  .object({
    year: z.number().int().min(2000),
    totalHours: z.number().min(0),
    kHours: z.number().min(0),
    sHours: z.number().min(0),
    aHours: z.number().min(0)
  })
  .refine((value) => Number((value.kHours + value.sHours + value.aHours).toFixed(2)) === Number(value.totalHours.toFixed(2)), {
    message: 'ผลรวม K/S/A ต้องเท่ากับชั่วโมงรวม',
    path: ['totalHours']
  });

export async function GET(
  request: NextRequest,
  context: { params: Promise<{ id: string }> }
) {
  try {
    const { organization } = await requireHRD();
    const params = await context.params;
    const employeeId = Number(params.id);
    const year = Number(request.nextUrl.searchParams.get('year') ?? new Date().getUTCFullYear());

    const target = await getEmployeeTargetForOrganization({
      organizationId: organization.id,
      employeeId,
      year
    });

    if (!target) {
      return NextResponse.json({ message: 'Employee not found' }, { status: 404 });
    }

    return NextResponse.json({
      success: true,
      time: new Date().toISOString(),
      message: 'Employee target loaded successfully',
      target
    });
  } catch (error) {
    if (error instanceof AuthError) {
      return NextResponse.json({ message: error.message }, { status: error.status });
    }

    return NextResponse.json({ message: 'Unable to load employee target' }, { status: 500 });
  }
}

export async function PUT(
  request: NextRequest,
  context: { params: Promise<{ id: string }> }
) {
  try {
    const { organization, session } = await requireHRD();
    const params = await context.params;
    const employeeId = Number(params.id);
    const body = await request.json();
    const parsed = targetSchema.safeParse({
      year: Number(body.year),
      totalHours: Number(body.totalHours),
      kHours: Number(body.kHours),
      sHours: Number(body.sHours),
      aHours: Number(body.aHours)
    });

    if (!parsed.success) {
      return NextResponse.json(
        {
          message: parsed.error.issues[0]?.message ?? 'Invalid target payload'
        },
        { status: 400 }
      );
    }

    const target = await upsertEmployeeTargetForOrganization({
      organizationId: organization.id,
      employeeId,
      actorUserId: session.user.id,
      values: parsed.data
    });

    if (!target) {
      return NextResponse.json({ message: 'Employee not found' }, { status: 404 });
    }

    return NextResponse.json({
      success: true,
      time: new Date().toISOString(),
      message: 'Employee target updated successfully',
      target
    });
  } catch (error) {
    if (error instanceof AuthError) {
      return NextResponse.json({ message: error.message }, { status: error.status });
    }

    return NextResponse.json({ message: 'Unable to update employee target' }, { status: 500 });
  }
}