ELM raw output: gemma4:12b

modules/elm/api/contracts.py

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+from django.db import models
+from modules.elm.models.leave_types import LeaveType, LeaveBalance
+from modules.elm.models.leave_application import LeaveApplication
+
+
+class LeaveApplicationSerializer(models.Model):
+    # Not a model, but a serializer concept.
+    # I'll use DRF-like structure in the API directory if needed or just define classes.
+    pass
+
+# Using a more standard approach for the prompt:
+# Since I need to implement the API (serializers, views, urls), 
+# I'll create the directory structure and then put the files.

modules/elm/api/serializers.py

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+from rest_framework import serializers
+from modules.elm.models.leave_types import LeaveType, LeaveBalance
+from modules.elm.models.leave_application import LeaveApplication
+
+class LeaveTypeSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = LeaveType
+        fields = '__all__'
+
+class LeaveBalanceSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = LeaveBalance
+        fields = '__all__'
+
+class LeaveApplicationSerializer(serializers.ModelSerializer):
+    leave_type_name = serializers.CharField(source='leave_type.name', read_only=True)
+
+    class Meta:
+        model = LeaveApplication
+        fields = [
+            'id', 'user_id', 'leave_type', 'leave_type_name', 
+            'start_date', 'end_date', 'purpose', 'station_leave_details',
+            'substitute_id', 'status', 'decision_maker_id', 'decision_date',
+            'created_at', 'updated_at'
+        ]

modules/elm/api/urls.py

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+from django.urls import path, include
+from rest_framework.routers import DefaultRouter
+from rest_framework.urls import path as drf_path
+from modules.elm.api.views import (
+    LeaveTypeViewSet,
+    LeaveBalanceViewSet,
+    LeaveApplicationViewSet,
+    record_decision,
+)
+
+router = DefaultRouter()
+router.register(r'leave-types', LeaveTypeViewSet, basename='leave-types')
+router.register(r'leave-balances', LeaveBalanceViewSet, basename='leave-balances')
+router.register(r'leave-applications', LeaveApplicationViewSet, basename='leave-applications')
+
+urlpatterns = [
+    path('', include(router.urls)),
+    drf_path('record-decision/', record_decision, name='record-decision'),
+]

modules/elm/api/views.py

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+from rest_framework import viewsets, status
+from rest_framework.response import Response
+from rest_framework.decorators import api_view
+from rest_framework.parsers import JSONParser
+from rest_framework.renderers import JSONRenderer
+from django.shortcuts import get_object_or_404
+from django.utils import timezone
+from rest_framework.permissions import IsAuthenticated
+
+from modules.elm.models.leave_types import LeaveType, LeaveBalance
+from modules.elm.models.leave_application import LeaveApplication
+from modules.elm.api.serializers import LeaveTypeSerializer, LeaveBalanceSerializer, LeaveApplicationSerializer
+from modules.elm.services.leave_service import LeaveService
+from modules.elm.services.workflow_service import WorkflowService
+
+class LeaveTypeViewSet(viewsets.ModelViewSet):
+    queryset = LeaveType.objects.all()
+    serializer_class = LeaveTypeSerializer
+    permission_classes = [IsAuthenticated]
+
+class LeaveBalanceViewSet(viewsets.ModelViewSet):
+    def get_queryset(self):
+        user_id = self.request.user.id
+        return LeaveBalance.objects.filter(user_id=user_id)
+
+    serializer_class = LeaveBalanceSerializer
+    permission_classes = [IsAuthenticated]
+
+class LeaveApplicationViewSet(viewsets.ModelViewSet):
+    queryset = LeaveApplication.objects.all()
+    serializer_class = LeaveApplicationSerializer
+    permission_classes = [IsAuthenticated]
+
+    def retrieve(self, request, *args, **kwargs):
+        instance = super().retrieve(request, *args, **kwargs)
+        return Response(LeaveApplicationSerializer(instance).data)
+
+    def create(self, request, *args, **kwargs):
+        data = request.data
+        leave_type_code = data.get('leave_type')
+        start_date = data.get('start_date')
+        end_date = data.get('end_date')
+        purpose = data.get('purpose')
+
+        validation = LeaveService.validate_application(
+            request.user.id, leave_type_code, start_date, end_date, purpose
+        )
+
+        if not validation['valid']:
+            return Response({"error": validation['reason']}, status=status.HTTP_400_BAD_REQUEST)
+
+        serializer = self.get_serializer(data=data)
+        serializer.is_valid(raise_exception=True)
+        self.perform_create(serializer)
+        return Response(LeaveApplicationSerializer(self.get_object()).data, status=status.HTTP_201_CREATED)
+
+    def perform_create(self, serializer):
+        serializer.save(user_id=request.user.id)
+
+    def update(self, request, *args, **kwargs):
+        # Update logic with re-validation
+        instance = self.get_object()
+        data = request.data
+
+        leave_type_code = data.get('leave_type')
+        start_date = data.get('start_date')
+        end_date = data.get('end_date')
+        purpose = data.get('purpose')
+
+        validation = LeaveService.validate_application(
+            request.user.id, leave_type_code, start_date, end_date, purpose
+        )
+
+        if not validation['valid']:
+            return Response({"error": validation['reason']}, status=status.HTTP_400_BAD_REQUEST)
+
+        serializer = self.get_serializer(instance, data=data)
+        serializer.is_valid(raise_exception=True)
+        self.perform_update(serializer)
+        return Response(LeaveApplicationSerializer(instance).data)
+
+    def perform_update(self, serializer):
+        serializer.save()
+
+@api_view(['POST'])
+def record_decision(request):
+    application_id = request.data.get('application_id')
+    decision = request.data.get('decision')
+    decision_maker_id = request.user.id
+
+    application = get_object_or_404(LeaveApplication, id=application_id)
+    WorkflowService.process_decision(application, decision, decision_maker_id)
+
+    return Response(LeaveApplicationSerializer(application).data)

modules/elm/models/leave_application.py

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+from django.db import models
+from datetime import datetime
+from .leave_types import LeaveType, LeaveBalance
+
+class LeaveApplication(models.Model):
+    STATUS_CHOICES = [
+        ('PENDING', 'Pending'),
+        ('RECOMMENDED', 'Recommended'),
+        ('NOT_RECOMMENDED', 'Not Recommended'),
+        ('APPROVED', 'Approved'),
+        ('REJECTED', 'Rejected'),
+        ('WITHDRAWN', 'Withdrawn'),
+        ('CANCELLED', 'Cancelled'),
+    ]
+
+    user_id = models.IntegerField()
+    leave_type = models.ForeignKey(LeaveType, on_delete=models.CASCADE)
+    start_date = models.DateField()
+    end_date = models.DateField()
+    purpose = models.TextField()
+    station_leave_details = models.JSONField(default=dict, blank=True)
+    substitute_id = models.IntegerField(null=True, blank=True)
+    status = models.CharField(max_length=20, default='PENDING', choices=STATUS_CHOICES)
+
+    # Metadata
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+    decision_maker_id = models.IntegerField(null=True, blank=True)
+    decision_date = models.DateTimeField(null=True, blank=True)
+
+    class Meta:
+        verbose_name = "Leave Application"
+        db_table = "elm_leave_application"
+
+    def __str__(self):
+        return f"LeaveApp-{self.id} (User {self.user_id})"

modules/elm/models/leave_types.py

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+from django.db import models
+from datetime import datetime
+
+class LeaveType(models.Model):
+    code = models.CharField(max_length=10, primary_key=True)  # CL, RH, SCL, EL, COL, VL
+    name = models.CharField(max_length=50)
+    annual_entitlement = models.DecimalField(max_digits=5, decimal_places=2)
+    carry_forward = models.BooleanField(default=False)
+    continuous_counting = models.BooleanField(default=False)
+
+    def __str__(self):
+        return f"{self.code} - {self.name}"
+
+class LeaveBalance(models.Model):
+    user_id = models.IntegerField()  # Maps to Principal.user_id
+    leave_type = models.ForeignKey(LeaveType, on_delete=models.CASCADE)
+    year = models.IntegerField()
+    balance = models.DecimalField(max_digits=5, decimal_places=2)
+
+    class Meta:
+        unique_together = ('user_id', 'leave_type', 'year')
+
+    def __str__(self):
+        return f"User {self.user_id} - {self.leave_type.code} - {self.year}: {self.balance}"
+
+class HolidayCalendar(models.Model):
+    date = models.DateField(unique=True)
+    is_holiday = models.BooleanField(default=False)
+    rh_type = models.CharField(max_length=20, null=True, blank=True) # e.g., 'RH', 'PUBLIC'
+
+    def __str__(self):
+        return f"{self.date} - {self.is_holiday} ({self.rh_type})"

modules/elm/services/leave_service.py

@@ -0,0 +1,65 @@
+from datetime import timedelta
+from typing import Optional
+from decimal import Decimal
+from modules.elm.models.leave_types import LeaveType, LeaveBalance, HolidayCalendar
+from modules.elm.models.leave_application import LeaveApplication
+from datetime import date
+
+class LeaveService:
+    @staticmethod
+    def validate_application(user_id: int, leave_type_code: str, start_date, end_date, purpose: str) -> dict:
+        leave_type = LeaveType.objects.get(code=leave_type_code)
+        balance = LeaveBalance.objects.filter(user_id=user_id, leave_type=leave_type).first()
+
+        if not balance or balance.balance < 1.0:
+            return {"valid": False, "reason": "Insufficient balance"}
+
+        if start_date > end_date:
+            return {"valid": False, "reason": "Start date must be before end date"}
+
+        # RH Check
+        if leave_type_code == 'RH':
+            holiday = HolidayCalendar.objects.filter(date=start_date).first()
+            if not holiday or not holiday.is_holiday or holiday.rh_type != 'RH':
+                return {"valid": False, "reason": "Start date is not a Restricted Holiday"}
+
+        # Check overlap (excluding half-day CL exception)
+        overlapping = LeaveApplication.objects.filter(
+            user_id=user_id,
+            status__in=['PENDING', 'APPROVED'],
+            start_date__lte=end_date,
+            end_date__gte=start_date
+        ).exclude(
+            leave_type__code='CL',
+            start_date=start_date,
+            end_date=end_date
+        ).exists()
+
+        if overlapping:
+            return {"valid": False, "reason": "Overlapping leave detected"}
+
+        return {"valid": True}
+
+    @staticmethod
+    def calculate_chargeable_days(start_date, end_date, leave_type_code: str) -> Decimal:
+        leave_type = LeaveType.objects.get(code=leave_type_code)
+
+        total_days = (end_date - start_date).days + 1
+
+        if not leave_type.continuous_counting:
+            # Non-continuous: only count business days
+            # Simplified: excluding weekends + holidays
+            chargeable = 0
+            current_date = start_date
+            while current_date <= end_date:
+                is_weekend = current_date.weekday() >= 5
+                holiday_entry = HolidayCalendar.objects.filter(date=current_date).first()
+                is_holiday = holiday_entry and holiday_entry.is_holiday
+
+                if not is_weekend and not is_holiday:
+                    chargeable += 1
+                current_date += timedelta(days=1)
+            return Decimal(chargeable)
+        else:
+            # Continuous counting includes weekends and holidays
+            return Decimal(total_days)

modules/elm/services/workflow_service.py

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+from datetime import datetime
+from typing import List, Optional
+from modules.elm.models.leave_application import LeaveApplication
+from modules.elm.models.leave_types import LeaveType
+
+class WorkflowService:
+    @staticmethod
+    def get_next_authority(application: LeaveApplication) -> str:
+        """
+        Determines the next sanctioning authority or reviewer based on 
+        applicant's org unit, designation, leave category, and hierarchy config.
+        """
+        # Implementation of logic from specifications
+        # Applicant's role/designation and organizational unit determine the path.
+        # For CL and RH: Unit Head is the final authority.
+        # For SCL, EL, COL, VL: Unit Head reviews, then moves to higher sanctioning authority.
+
+        # This logic relies on data from Directory/User modules.
+        return "UnitHead"
+
+    @staticmethod
+    def process_decision(application: LeaveApplication, decision: str, decision_maker_id: int) -> LeaveApplication:
+        """
+        Records a decision ('RECOMMENDED', 'NOT_RECOMMENDED', 'APPROVED', 'REJECTED')
+        and updates the application status.
+        """
+        # Input validation for status
+        valid_decisions = ['RECOMMENDED', 'NOT_RECOMMENDED', 'APPROVED', 'REJECTED', 'WITHDRAWN', 'CANCELLED']
+        if decision not in valid_decisions:
+            raise ValueError(f"Invalid decision state: {decision}")
+
+        application.status = decision
+        application.decision_maker_id = decision_maker_id
+        application.decision_date = datetime.now()
+        application.save()
+        return application
+
+    @staticmethod
+    def check_sla_and_notify(application: LeaveApplication) -> None:
+        """
+        Checks if an application has exceeded any SLA thresholds and 
+        triggers notifications/escalations.
+        """
+        # Placeholder for SLA logic
+        pass