(*
	Calendar Sync Script
	
	Synchronizes calendar events between two calendar accounts for the current day.
	Reads events from a source calendar and mirrors them to a destination calendar,
	including removal of events that no longer exist in the source.
*)

-- Configuration Properties
property sourceAccountName : "Work Account"
property sourceCalendarName : "Main Calendar"
property destinationAccountName : "Personal Account"
property destinationCalendarName : "Synced Events"
property enableLogging : true
property enableDebugMode : false

-- Logging levels
property LOG_ERROR : 1
property LOG_WARNING : 2
property LOG_INFO : 3
property LOG_DEBUG : 4

-- Global variables for tracking sync state
global syncResults
global errorList

-- Initialize sync results record
on initializeSyncResults()
	set syncResults to {eventsCreated:0, eventsUpdated:0, eventsRemoved:0, eventsSkipped:0, errors:{}}
	set errorList to {}
end initializeSyncResults

-- Main entry point
on run
	try
		-- Initialize logging and sync tracking
		initializeSyncResults()
		logMessage("Starting Calendar Sync", LOG_INFO)
		
		-- Display configuration
		logMessage("Source: " & sourceAccountName & " -> " & sourceCalendarName, LOG_INFO)
		logMessage("Destination: " & destinationAccountName & " -> " & destinationCalendarName, LOG_INFO)
		
		-- TODO: Implement main sync workflow
		logMessage("Calendar sync setup complete", LOG_INFO)
		
	on error errorMessage number errorNumber
		handleError("Main execution error: " & errorMessage, errorNumber)
	end try
end run

-- Logging and Error Handling Framework

-- Log a message with specified level
on logMessage(message, level)
	if not enableLogging then return
	
	set levelText to getLevelText(level)
	set timestamp to (current date) as string
	set logEntry to "[" & timestamp & "] " & levelText & ": " & message
	
	-- Display to user (can be modified to write to file if needed)
	if level ≤ LOG_WARNING or enableDebugMode then
		display notification message with title "Calendar Sync " & levelText
	end if
	
	-- Always log errors and warnings to console
	if level ≤ LOG_WARNING then
		log logEntry
	else if enableDebugMode then
		log logEntry
	end if
end logMessage

-- Get text representation of log level
on getLevelText(level)
	if level = LOG_ERROR then
		return "ERROR"
	else if level = LOG_WARNING then
		return "WARNING"
	else if level = LOG_INFO then
		return "INFO"
	else if level = LOG_DEBUG then
		return "DEBUG"
	else
		return "UNKNOWN"
	end if
end getLevelText

-- Handle errors with logging and user feedback
on handleError(errorMessage, errorNumber)
	set fullErrorMessage to errorMessage & " (Error " & errorNumber & ")"
	
	-- Log the error
	logMessage(fullErrorMessage, LOG_ERROR)
	
	-- Add to error list for reporting
	set end of errorList to fullErrorMessage
	
	-- Display user-friendly error dialog
	display dialog "Calendar Sync Error: " & errorMessage buttons {"OK"} default button "OK" with icon stop
end handleError

-- Display progress to user
on displayProgress(currentItem, totalItems, itemDescription)
	if not enableLogging then return
	
	set progressPercent to round ((currentItem / totalItems) * 100)
	set progressMessage to "Processing " & itemDescription & " (" & currentItem & " of " & totalItems & " - " & progressPercent & "%)"
	
	logMessage(progressMessage, LOG_INFO)
end displayProgress

-- Display final sync summary
on showSyncSummary()
	set summaryMessage to "Sync Complete!" & return & return
	set summaryMessage to summaryMessage & "Events Created: " & (eventsCreated of syncResults) & return
	set summaryMessage to summaryMessage & "Events Updated: " & (eventsUpdated of syncResults) & return
	set summaryMessage to summaryMessage & "Events Removed: " & (eventsRemoved of syncResults) & return
	set summaryMessage to summaryMessage & "Events Skipped: " & (eventsSkipped of syncResults) & return
	
	if (count of errorList) > 0 then
		set summaryMessage to summaryMessage & return & "Errors encountered: " & (count of errorList)
	end if
	
	logMessage(summaryMessage, LOG_INFO)
	display dialog summaryMessage buttons {"OK"} default button "OK" with icon note
end showSyncSummary

-- Validate configuration before starting sync
on validateConfiguration()
	logMessage("Validating configuration...", LOG_DEBUG)
	
	-- Check that required properties are set
	if sourceAccountName = "" or sourceCalendarName = "" then
		handleError("Source calendar configuration is incomplete", -1)
		return false
	end if
	
	if destinationAccountName = "" or destinationCalendarName = "" then
		handleError("Destination calendar configuration is incomplete", -2)
		return false
	end if
	
	logMessage("Configuration validation passed", LOG_DEBUG)
	return true
end validateConfiguration

-- Utility function to get current date for today's events
on getCurrentDate()
	return current date
end getCurrentDate

-- Utility function to create date range for current day
on getCurrentDayRange()
	set today to getCurrentDate()
	set startOfDay to date (short date string of today)
	set endOfDay to startOfDay + (24 * hours) - 1
	
	return {startDate:startOfDay, endDate:endOfDay}
end getCurrentDayRange