Update Shift

Purpose:

This function handles the update of an existing shift within the system. It involves:

1. Extracting Shift ID:

   • Retrieves the shift ID from the URL path parameter.

   • Validates the ID to ensure it's not empty.

2. Binding and Validating Request Payload:

   • Extracts the CreateShiftRequest payload from the incoming HTTP request.

   • Validates the payload data against defined constraints.

3. 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.

4. Fetching Current Shift:

   • Retrieves the current shift information from the database using the provided ID.

5. Database Transaction:

   • Initiates a database transaction to ensure data consistency.

   • Inserts a new shift record with updated information.

   • Inserts associated shift breaks for the new shift.

   • Archives the old shift record, linking it to the new one.

6. Returning Response:

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

Function Signature:

func (h *ShiftHandler) UpdateShift(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 update process.

Error Handling:

The function handles errors at various stages:

• Invalid ID: If the provided ID is empty, a validation error is returned.

• 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.

• Fetching Current Shift: Errors during fetching the current shift are returned.

• Database Transaction: Errors during database operations (insert new shift, insert breaks, archive old shift) are returned.

Example Usage:

// Assuming an HTTP PUT request with a valid JSON payload:  
{      
    "name": "Updated Morning Shift",      
    "start_time": "09:30:00",      
    "end_time": "17:30:00",      
    "is_flexible": true,      "flexible_start_time_range": "08:30:00-10:30:00",      
    "flexible_end_time_range": "16:30:00-18:30:00",      
    "breaks": [          
            {              
                "start_time": "12:30:00",              
                "end_time": "13:30:00"          
            }      
        ]  
}  
/* 
The function will:  
1. Extract the shift ID from the URL.  
2. Validate the ID.  
3. Parse the JSON payload into a `CreateShiftRequest` struct.  
4. Validate the payload.  
5. Calculate the actual start and end times based on the flexible ranges.  
6. Fetch the current shift information.  
7. Begin a database transaction.  
8. Insert a new shift record with updated information.  
9. Insert the shift break into the `shift_breaks` table for the new shift.  
10. Archive the old shift record, linking it to the new one.  
11. Commit the transaction.  
12. 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.