' ============================================================
' Common Functions
' ============================================================

Function CleanCSVField(ByVal field As Variant) As String
    If IsEmpty(field) Or IsNull(field) Then
        CleanCSVField = ""
        Exit Function
    End If
    
    Dim result As String
    result = Trim(CStr(field))
    
    If Len(result) >= 2 Then
        If Left(result, 1) = """" And Right(result, 1) = """" Then
            result = Mid(result, 2, Len(result) - 2)
            result = Replace(result, """""", """")
        End If
    End If
    
    CleanCSVField = result
End Function

Function ValidateCSVColumnCount(ByVal lines As Variant, ByVal expectedColumns As Long) As Boolean
    ValidateCSVColumnCount = True
    
    Dim lineNum As Long
    Dim dataArray As Variant
    Dim validRowCount As Long
    validRowCount = 0
    
    For lineNum = 0 To UBound(lines)
        If Trim(lines(lineNum)) <> "" Then
            dataArray = Split(lines(lineNum), ",")
            If UBound(dataArray) + 1 <> expectedColumns Then
                MsgBox "CSV line " & (lineNum + 1) & " has " & (UBound(dataArray) + 1) & " columns. Expected " & expectedColumns & ".", vbExclamation
                ValidateCSVColumnCount = False
                Exit Function
            End If
            validRowCount = validRowCount + 1
        End If
    Next lineNum
    
    If validRowCount = 0 Then
        MsgBox "No valid data in CSV.", vbExclamation
        ValidateCSVColumnCount = False
    End If
End Function

Function GetLastDataRow(ByVal ws As Worksheet, ByVal columnNum As Long) As Long
    GetLastDataRow = ws.Cells(ws.Rows.Count, columnNum).End(xlUp).Row
End Function

Sub ClearDataRows(ByVal ws As Worksheet, ByVal startRow As Long, ByVal columnNum As Long)
    Dim lastRow As Long
    lastRow = ws.Cells(ws.Rows.Count, columnNum).End(xlUp).Row
    
    If lastRow >= startRow Then
        ws.Range(ws.Cells(startRow, 1), ws.Cells(lastRow, 20)).ClearContents
    End If
End Sub

Function SelectCSVFile() As String
    Dim fileDialog As FileDialog
    Set fileDialog = Application.FileDialog(msoFileDialogFilePicker)
    
    With fileDialog
        .Filters.Clear
        .Filters.Add "CSV Files", "*.csv"
        .AllowMultiSelect = False
        If .Show <> -1 Then
            SelectCSVFile = ""
            Exit Function
        End If
        SelectCSVFile = .SelectedItems(1)
    End With
End Function


Function GetSaveCSVPath(Optional ByVal defaultName As String = "") As String
    Dim savePath As String
    savePath = Application.GetSaveAsFilename( _
        FileFilter:="CSV Files (*.csv), *.csv", _
        Title:="Save CSV", _
        InitialFileName:=defaultName)
    
    If savePath = "False" Or savePath = "" Then
        GetSaveCSVPath = ""
        Exit Function
    End If
    
    If InStr(1, savePath, ".csv", vbTextCompare) = 0 Then
        savePath = savePath & ".csv"
    End If
    
    GetSaveCSVPath = savePath
End Function

Sub WriteCSVFile(ByVal filePath As String, ByVal content As String)
    Dim stream As Object
    Set stream = CreateObject("ADODB.Stream")
    With stream
        .Type = 2
        .Charset = "shift_jis"
        .Open
        .WriteText content, 0
        .SaveToFile filePath, 2
        .Close
    End With
End Sub


Function ReadCSVFile(ByVal filePath As String, Optional ByVal charset As String = "shift_jis") As Variant
    If filePath = "" Then
        ReadCSVFile = Array()
        Exit Function
    End If
    
    Dim stream As Object
    Dim textContent As String
    
    Set stream = CreateObject("ADODB.Stream")
    With stream
        .Type = 2
        .Charset = charset
        .Open
        .LoadFromFile filePath
        textContent = .ReadText
        .Close
    End With
    
    ReadCSVFile = Split(textContent, vbLf)
End Function

Sub SortDataRows(Optional ByVal sortColumn As Long = 3)
    Dim ws As Worksheet
    Dim lastRow As Long
    Dim startRow As Long
    Dim sortOrder As Long
    
    Set ws = ActiveSheet
    startRow = 7
    lastRow = GetLastDataRow(ws, sortColumn)
    
    If lastRow < startRow Then
        MsgBox "No data to sort.", vbExclamation
        Exit Sub
    End If
    
    ' Determine sort order based on first row's current state
    Dim currentFirst As String
    Dim nextFirst As String
    currentFirst = Trim(ws.Cells(startRow, sortColumn).Value)
    nextFirst = Trim(ws.Cells(startRow + 1, sortColumn).Value)
    
    If currentFirst <> "" And nextFirst <> "" Then
        If currentFirst > nextFirst Then
            sortOrder = xlAscending
        Else
            sortOrder = xlDescending
        End If
    Else
        sortOrder = xlAscending
    End If
    
    ws.Range(ws.Cells(startRow, 1), ws.Cells(lastRow, 20)).Sort _
        Key1:=ws.Cells(startRow, sortColumn), _
        Order1:=sortOrder, _
        Header:=xlNo
End Sub