<%
'=======================================================================================================================
' INDUSTRY REPOSITORY
'=======================================================================================================================
Class IndustryRepository_Class

    ' All industries with the number of businesses in each: list of Dictionary(id, name, n)
    Public Function All()
        Dim list, rs, d
        Set list = CreateObject("Scripting.Dictionary")
        Set rs = Db_Query("SELECT i.id, i.name, COUNT(b.id) AS n FROM industries i LEFT JOIN businesses b ON b.industry_id = i.id GROUP BY i.id, i.name ORDER BY i.name", Array())
        Do While Not rs.EOF
            Set d = CreateObject("Scripting.Dictionary")
            d("id") = CLng(rs(0)) : d("name") = rs(1) & "" : d("n") = CLng(rs(2))
            list.Add list.Count, d
            rs.MoveNext
        Loop
        rs.Close
        Set All = list
    End Function

    Public Function UncategorizedCount()
        Dim rs
        Set rs = Db_Query("SELECT COUNT(*) FROM businesses WHERE industry_id IS NULL", Array())
        UncategorizedCount = CLng(rs(0))
        rs.Close
    End Function

    Public Function Find(id)
        Dim rs
        Set rs = Db_Query("SELECT i.id, i.name, (SELECT COUNT(*) FROM businesses b WHERE b.industry_id = i.id) AS n FROM industries i WHERE i.id = ?", Array(Db_PI(id)))
        If rs.EOF Then
            Set Find = Nothing
        Else
            Dim d : Set d = CreateObject("Scripting.Dictionary")
            d("id") = CLng(rs(0)) : d("name") = rs(1) & "" : d("n") = CLng(rs(2))
            Set Find = d
        End If
        rs.Close
    End Function

    ' True when another industry (not excludeId) already has this name (case-insensitive).
    Public Function NameTaken(name, excludeId)
        Dim rs
        Set rs = Db_Query("SELECT COUNT(*) FROM industries WHERE name = ? AND id <> ?", Array(Db_PS(name), Db_PI(excludeId)))
        NameTaken = (CLng(rs(0)) > 0)
        rs.Close
    End Function

    Public Sub Create(name)
        Db_Exec "INSERT INTO industries (name) VALUES (?)", Array(Db_PS(name))
    End Sub

    Public Sub Rename(id, name)
        Db_Exec "UPDATE industries SET name = ? WHERE id = ?", Array(Db_PS(name), Db_PI(id))
    End Sub

    ' Moves every business from sourceId to targetId, then deletes sourceId. Returns the number of businesses moved.
    Public Function Merge(sourceId, targetId)
        Dim conn, moved, rs, msg
        Set conn = DAL().Connection
        Set rs = Db_Query("SELECT COUNT(*) FROM businesses WHERE industry_id = ?", Array(Db_PI(sourceId)))
        moved = CLng(rs(0))
        rs.Close

        conn.BeginTrans
        On Error Resume Next
        Db_Exec "UPDATE businesses SET industry_id = ? WHERE industry_id = ?", Array(Db_PI(targetId), Db_PI(sourceId))
        If Err.Number = 0 Then Db_Exec "DELETE FROM industries WHERE id = ?", Array(Db_PI(sourceId))
        If Err.Number <> 0 Then
            msg = Err.Description
            Err.Clear
            conn.RollbackTrans
            On Error GoTo 0
            Err.Raise 5, "IndustryRepository.Merge", msg
        End If
        conn.CommitTrans
        On Error GoTo 0
        Merge = moved
    End Function

    Public Sub Delete(id)
        Db_Exec "DELETE FROM industries WHERE id = ?", Array(Db_PI(id))
    End Sub
End Class

Dim IndustryRepository_Class__Singleton
Function IndustryRepository()
    If IsEmpty(IndustryRepository_Class__Singleton) Then
        Set IndustryRepository_Class__Singleton = New IndustryRepository_Class
    End If
    Set IndustryRepository = IndustryRepository_Class__Singleton
End Function
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