/*
	Optional Inputs:
	----------------
			01. label
			02. instructions (Pagination Instructions if the input is null)
			03. selectable (False if the input is null)
			04. selectionRequired (False if the input is null)
			05. selectionDisabled (True if the input is null)
			06. selectionValue
			07. selectionSaveArray
			08. validations
			09. validationGroup
			10. helpTooltip
			11. items
			12. emptyGridMessage
			13. isValidateWhileNavigation (False if the input is null)
			14. firstPageSaveArray
			15. lastPageSaveArray
			16. nextPageSaveArray
			17. previousPageSaveArray

	Required Inputs:
	----------------
			01. headerCells 
			02. nameOfItemsRowEachRule
			03. columnConfigs
			04. pagingInfo
			05. addRowLinkLabel 
			06. addRowLinkValue
	
	Example:
	--------
			rule!PS_EditableGrid_SAIL_GetEditableGrid(
				label: "",
				instructions:null,
				headerCells: {
					a!gridLayoutHeaderCell(label: "Summary"),
					a!gridLayoutHeaderCell(label: "Qty", align: "RIGHT"),
					a!gridLayoutHeaderCell(label: "", align: "RIGHT")
				},
				nameOfItemsRowEachRule: rule!PS_EditableGrid_SAIL_TestUCItemsRowEach,
				selectable:true,
				selectionRequired: false,
				selectionDisabled: false,
				selectionValue: {},
				selectionSaveInto: {
				  local!selectedValues
				},
				validations: null,
				validationGroup: null,
				totalCount: length(local!items),
				columnConfigs: {
					a!gridLayoutColumnConfig(width: "DISTRIBUTE", weight: 5),
					a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
					a!gridLayoutColumnConfig(width: "DISTRIBUTE")
				},
				pagingInfo: local!pagingInfo,
				isValidateWhileNavigation:false,
				addRowLinkLabel:"Add Item",
				addRowLinkValue: 'type!{urn:com:appian:types}PS_example1CDT'()
			)
*/
load(
 
  /* Length of items array */
  local!lengthOfItems: if(fn!isnull(ri!items),0,length(ri!items)),
  local!itemsToken: ri!items,
  
  /* Assign default values to the variables incase if the rule inputs aren't assigned values */
  local!isValidateWhileNavigation: rule!COMMON_Util_ReplaceNull(
									nullableValue: ri!isValidateWhileNavigation,
									replacementValue: fn!false()
  ),
  local!selectionRequired: rule!COMMON_Util_ReplaceNull(
								nullableValue: ri!selectionRequired,
								replacementValue: fn!false()
  ),
  local!selectionDisabled: rule!COMMON_Util_ReplaceNull(
								nullableValue: ri!selectionDisabled,
								replacementValue: fn!true()
  ),
  local!selectable: rule!COMMON_Util_ReplaceNull(
								nullableValue: ri!selectable,
								replacementValue: fn!false()
  ),
  local!instructions: rule!COMMON_Util_ReplaceNull(
							nullableValue:ri!instructions,
							replacementValue:fn!concat(fn!if(local!lengthOfItems=0,0,ri!pagingInfo.startIndex), "-", fn!if(local!lengthOfItems <= ((ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1),local!lengthOfItems,(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1), " of ", local!lengthOfItems)
  ),
  
  /* Enable or Disable Navigations */
  local!isNextPageNavigationDisabled: (ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems,
  local!isPreviousPageNavigationDisabled: ri!pagingInfo.startIndex = 1,
  local!isFirstPageNavigationDisabled: ri!pagingInfo.startIndex = 1,
  local!isLastPageNavigationDisabled: (ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems,

		{
			/* Editable Grid with Pagination */
			a!gridLayout(
				
				label: ri!label,
				instructions: local!instructions,
				helpTooltip: ri!helpTooltip,
				totalCount: local!lengthOfItems,
				emptyGridMessage: ri!emptyGridMessage,
				columnConfigs: ri!columnConfigs,
				selectable: local!selectable,
				selectionRequired: local!selectionRequired,
				selectionDisabled: local!selectionDisabled,
				selectionValue: ri!selectionValue,
				selectionSaveInto: {
					ri!selectionValue,
					
					/* Any additional operations that should be performed upon making selections. This way any rule that invokes this rule can start making their own save operations apart from saving the selected values. */
					ri!selectionSaveArray
				},
				addRowLink: a!dynamicLink(
								  label: ri!addRowLinkLabel,
								  value: ri!addRowLinkValue,
								  saveInto: {
								  
										/* Append to items array */
										a!save(
											ri!items, 
											fn!append(ri!items, save!value)
										),
										
										/* Append to itemsToken array */
										a!save(
											local!itemsToken, 
											ri!items
										),
										
										/* Update the length of the items */
										a!save(
											local!lengthOfItems,
											fn!if(fn!isnull(ri!items),0,fn!length(ri!items))
										),
										
										/* Update Paging Info */
										a!save(
											ri!pagingInfo,
											fn!topaginginfo(
												fn!if(
													local!lengthOfItems > ((ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1),
													(fn!quotient(local!lengthOfItems,ri!pagingInfo.batchSize)*ri!pagingInfo.batchSize) + 1,
													ri!pagingInfo.startIndex
												),
												ri!pagingInfo.batchSize
											)
										),
										
										/* Enable or Disable Navigations */
										a!save(
											local!isNextPageNavigationDisabled,
											(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
										),
										a!save(
											local!isPreviousPageNavigationDisabled, 
											ri!pagingInfo.startIndex = 1
										),
										a!save(
											local!isFirstPageNavigationDisabled, 
											ri!pagingInfo.startIndex = 1
										),
										a!save(
											local!isLastPageNavigationDisabled, 
											(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
										),
										
										/* Update Instructions */
										a!save(
											local!instructions,
											rule!COMMON_Util_ReplaceNull(
												nullableValue:ri!instructions,
												replacementValue:fn!concat(fn!if(local!lengthOfItems=0,0,ri!pagingInfo.startIndex), "-", fn!if(local!lengthOfItems <= ((ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1),local!lengthOfItems,(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1), " of ", local!lengthOfItems)
											)
										)
								  }
				),
				validations: ri!validations,
				validationGroup: ri!validationGroup,
				headerCells: ri!headerCells,
				
				/* NOTE: Make sure that the Grid Row Layout rule has only four parameters namely  items, index, itemsToken and removeAdditionalSaveArray. This is a drawback/limitation/constraint. And removeAdditionalSaveArray should be configured in the saveInto of the Delete Operation */
				rows: a!applyComponents(
					  ri!nameOfItemsRowEachRule(
							items:ri!items,
							index:_,
							itemsToken:local!itemsToken,
							removeAdditionalSaveArray: {
							
											/* Update the length of the items */
											a!save(
												local!lengthOfItems,
												fn!if(fn!isnull(ri!items),0,fn!length(ri!items))
											),
											
											/* Update Paging Info */
											a!save(
												ri!pagingInfo,
												fn!topaginginfo(
													fn!if(
														local!lengthOfItems <= ri!pagingInfo.batchSize,
														1,
														fn!if(
															rule!COMMON_Util_IsEmpty(data:fn!index(ri!items,enumerate(ri!pagingInfo.batchSize)+ri!pagingInfo.startIndex,null)),
															ri!pagingInfo.startIndex - ri!pagingInfo.batchSize,
															ri!pagingInfo.startIndex
														)
													),
													ri!pagingInfo.batchSize
												)
											),
											
											/* Enable or Disable Navigations */
											a!save(
												local!isNextPageNavigationDisabled,
												(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
											),
											a!save(
												local!isPreviousPageNavigationDisabled, 
												ri!pagingInfo.startIndex = 1
											),
											a!save(
												local!isFirstPageNavigationDisabled, 
												ri!pagingInfo.startIndex = 1
											),
											a!save(
												local!isLastPageNavigationDisabled, 
												(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
											),
											
											/* Update Instructions */
											a!save(
												local!instructions,
												rule!COMMON_Util_ReplaceNull(
													nullableValue:ri!instructions,
													replacementValue:fn!concat(fn!if(local!lengthOfItems=0,0,ri!pagingInfo.startIndex), "-", fn!if(local!lengthOfItems <= ((ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1),local!lengthOfItems,(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1), " of ", local!lengthOfItems)
												)
											)
										}
					  ),
					  fn!if(
							local!lengthOfItems=0,
							{},
							ri!pagingInfo.startIndex + fn!if(
									local!lengthOfItems < ((ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1),
									fn!enumerate((local!lengthOfItems - ri!pagingInfo.startIndex)+1),
									fn!enumerate(ri!pagingInfo.batchSize)
							)
					  ),
					  local!itemsToken
				)
			),
			
			/* Buttons that help navigating in Grid and also helps in simulating the Pagination functionality */
			
			/* Next Page Navigation */
			a!buttonLayout(
			  primaryButtons: {
				a!buttonWidget(
				  label: ">",
				  style: "NORMAL",
				  confirmMessage: null,
				  submit: fn!false(),
				  disabled: local!isNextPageNavigationDisabled,
				  validate : local!isValidateWhileNavigation,
				  validationGroup: null,
				  value: null,
				  saveInto: {
					/* Update Paging Info */
					a!save(
						ri!pagingInfo,
						fn!topaginginfo(
							ri!pagingInfo.startIndex + ri!pagingInfo.batchSize,
							ri!pagingInfo.batchSize
						)
					),
					
					/* Any additional operations that should be performed upon navigating to next page. This way any rule that invokes this rule can start making its specific save operations apart from default save operations. */
					ri!nextPageSaveArray,

					/* Enable or Disable Navigations */
					a!save(
						local!isNextPageNavigationDisabled,
						(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
					),
					a!save(
						local!isPreviousPageNavigationDisabled, 
						ri!pagingInfo.startIndex = 1
					),
					a!save(
						local!isFirstPageNavigationDisabled, 
						ri!pagingInfo.startIndex = 1
					),
					a!save(
						local!isLastPageNavigationDisabled, 
						(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
					),
                    
					/* Update Instructions */
					a!save(
						local!instructions,
						rule!COMMON_Util_ReplaceNull(
							nullableValue:ri!instructions,
							replacementValue:fn!concat(fn!if(local!lengthOfItems=0,0,ri!pagingInfo.startIndex), "-", fn!if(local!lengthOfItems <= ((ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1),local!lengthOfItems,(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1), " of ", local!lengthOfItems)
						)
					)					
				  }
				),
				
				/* Last Page Navigation */
				a!buttonWidget(
				  label: ">>",
				  style: "NORMAL",
				  confirmMessage: null,
				  submit: fn!false(),
				  disabled: local!isLastPageNavigationDisabled,
				  validate : local!isValidateWhileNavigation,
				  value: null,
				  saveInto: {
					/* Update Paging Info */
					a!save(
						ri!pagingInfo,
						fn!topaginginfo(
							((fn!quotient(local!lengthOfItems,ri!pagingInfo.batchSize)-fn!if(fn!mod(local!lengthOfItems,ri!pagingInfo.batchSize)=0,1,0))*ri!pagingInfo.batchSize) + 1,
							ri!pagingInfo.batchSize
						)
					),
					
					/* Any additional operations that should be performed upon navigating to last page. This way any rule that invokes this rule can start making its specific save operations apart from default save operations. */
					ri!lastPageSaveArray,
					
					/* Enable or Disable Navigations */
					a!save(
						local!isNextPageNavigationDisabled,
						(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
					),
					a!save(
						local!isPreviousPageNavigationDisabled, 
						ri!pagingInfo.startIndex = 1
					),
					a!save(
						local!isFirstPageNavigationDisabled, 
						ri!pagingInfo.startIndex = 1
					),
					a!save(
						local!isLastPageNavigationDisabled, 
						(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
					),
					
					/* Update Instructions */
					a!save(
						local!instructions,
						rule!COMMON_Util_ReplaceNull(
							nullableValue:ri!instructions,
							replacementValue:fn!concat(fn!if(local!lengthOfItems=0,0,ri!pagingInfo.startIndex), "-", fn!if(local!lengthOfItems <= ((ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1),local!lengthOfItems,(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1), " of ", local!lengthOfItems)
						)
					)
				  }
				)
			  },
			  secondaryButtons: {
			  
				/* First Page Navigation */
				a!buttonWidget(
				  label: "<<",
				  style: "NORMAL",
				  confirmMessage: null,
				  submit: false,
				  disabled: local!isFirstPageNavigationDisabled,
				  validate : local!isValidateWhileNavigation,
				  validationGroup: null,
				  value: null,
				  saveInto: {
					/* Update Paging Info */
					a!save(
						ri!pagingInfo,
						fn!topaginginfo(1,ri!pagingInfo.batchSize)
					),
					
					/* Any additional operations that should be performed upon navigating to first page. This way any rule that invokes this rule can start making its specific save operations apart from default save operations. */
					ri!firstPageSaveArray,
					
					/* Enable or Disable Navigations */
					a!save(
						local!isNextPageNavigationDisabled,
						(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
					),
					a!save(
						local!isPreviousPageNavigationDisabled, 
						ri!pagingInfo.startIndex = 1
					),
					a!save(
						local!isFirstPageNavigationDisabled, 
						ri!pagingInfo.startIndex = 1
					),
					a!save(
						local!isLastPageNavigationDisabled, 
						(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
					),
					
					/* Update Instructions */
					a!save(
						local!instructions,
						rule!COMMON_Util_ReplaceNull(
							nullableValue:ri!instructions,
							replacementValue:fn!concat(fn!if(local!lengthOfItems=0,0,ri!pagingInfo.startIndex), "-", fn!if(local!lengthOfItems <= ((ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1),local!lengthOfItems,(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1), " of ", local!lengthOfItems)
						)
					)
				  }
				),
				
				/* Previous Page Navigation */
				a!buttonWidget(
				  label: "<",
				  style: "NORMAL",
				  confirmMessage: null,
				  submit: false,
				  disabled: local!isPreviousPageNavigationDisabled,
				  validate : local!isValidateWhileNavigation,
				  validationGroup: null,
				  value: null,
				  saveInto: {
					/* Update Paging Info */
					a!save(
						ri!pagingInfo,
						fn!topaginginfo(
							ri!pagingInfo.startIndex - ri!pagingInfo.batchSize,
							ri!pagingInfo.batchSize
						)
					),
					
					/* Any additional operations that should be performed upon navigating to last page. This way any rule that invokes this rule can start making its specific save operations apart from default save operations. */
					ri!previousPageSaveArray,
					
					/* Enable or Disable Navigations */
					a!save(
						local!isNextPageNavigationDisabled,
						(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
					),
					a!save(
						local!isPreviousPageNavigationDisabled, 
						ri!pagingInfo.startIndex = 1
					),
					a!save(
						local!isFirstPageNavigationDisabled, 
						ri!pagingInfo.startIndex = 1
					),
					a!save(
						local!isLastPageNavigationDisabled, 
						(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) > local!lengthOfItems
					),
					
					/* Update Instructions */
					a!save(
						local!instructions,
						rule!COMMON_Util_ReplaceNull(
							nullableValue:ri!instructions,
							replacementValue:fn!concat(fn!if(local!lengthOfItems=0,0,ri!pagingInfo.startIndex), "-", fn!if(local!lengthOfItems <= ((ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1),local!lengthOfItems,(ri!pagingInfo.startIndex + ri!pagingInfo.batchSize) - 1), " of ", local!lengthOfItems)
						)
					)
				  }
				)
			  }
			)
		}
)