Create Shift

Purpose:

This function handles the creation of a new shift within the system. It involves:

1. Binding and Validating Request Payload:

   • Extracts the CreateShiftRequest payload from the incoming HTTP request.

   • Validates the payload data against defined constraints.

2. Preparing Flexible Start and End Dates:

   • If the shift has a flexible start or end time, calculates the appropriate start and end dates based on the provided time ranges.

3. Database Transaction:

   • Initiates a database transaction to ensure data consistency.

   • Inserts the new shift into the shifts table.

   • Inserts associated shift breaks into the shift_breaks table.

4. Returning Response:

   • Sends an HTTP OK response with an empty JSON body upon successful shift creation.

Function Signature:

func (h *ShiftHandler) CreateShift(c echo.Context) error   

Parameters:

• c: An echo.Context object representing the incoming HTTP request.

Return Value:

• An error value indicating if an error occurred during the shift creation process.

Error Handling:

The function handles errors at various stages:

• Binding and Validation: Errors during payload binding or validation are returned directly.

• Flexible Date Preparation: Errors in calculating flexible start and end dates are returned.

• Database Transaction: Errors during database operations (insert shifts, insert breaks) are returned.

Example Usage:

// Assuming an HTTP POST request with a valid JSON payload:  
{      
    "name": "Morning Shift",      
    "start_time": "09:00:00",      
    "end_time": "17:00:00",      
    "is_flexible": true,      
    "flexible_start_time_range": "08:00:00-10:00:00",      
    "flexible_end_time_range": "16:00:00-18:00:00",      
    "breaks": [          
            {              
            "start_time": "12:00:00",              
            "end_time": "13:00:00"          
            } 
        ] 
}  
    // The function will:  1. Parse the JSON payload into a `CreateShiftRequest` struct.  2. Validate the payload.  3. Calculate the actual start and end times based on the flexible ranges.  4. Begin a database transaction.  5. Insert the shift into the `shifts` table.  6. Insert the shift break into the `shift_breaks` table.  7. Commit the transaction.  8. Return an HTTP 200 OK response.   

Additional Notes:

• The entity.CreateShiftRequest struct likely defines the expected fields for a new shift.

• The daos.Dao struct probably provides database access methods.

• The queries package might contain SQL queries for database operations.

• The response package might be a custom library for handling HTTP responses.