// Dynamic format string generator for comparison values (in value)
// Returns format string with directional indicators based on parameters
(
    // Position of comparison symbol
    // Expects "PREFIX" or "SUFFIX"
    position: STRING,

    // Number of decimal places
    // Expects an INT64 value from 0-9
    decimal_places: INT64,

    // Symbol style - number (1-9) or text:
    // 1 or "ARROWS": ↑/↓
    // 2 or "TRIANGLES": ▲/▼
    // 3 or "PLUSMINUS": +/-
    // 4 or "CHEVRONS": ˄/˅
    // 5 or "GREENRED": 🟢/🔴
    // 6 or "BLUEORANGE": 🔵/🟠
    // 7 or "BLOCKARROWS": ⬆/⬇
    // 8 or "CHECKCROSS": ✓/✗
    // 9 or "NONE": no symbol
    symbol: ANYVAL,

    // Custom prefix text (optional)
    // Enter "" to skip parameter
    // Enter SELECTEDVALUE( 'Exchange Rate'[Currency Symbol] ) for dynamic currency conversion
    //
    // Note: Value is string-safe; no need for """"
    custom_prefix: EXPR,

    // Custom suffix text (optional)
    // Enter "" to skip parameter
    // Enter SELECTEDVALUE( 'Exchange Rate'[Currency Symbol] ) for dynamic currency conversion
    // Enter " (" & FORMAT ( [PercentMeasure], "0.0%" ) & ")" to add a second value for context
    //
    // Note: Value is string-safe; no need for """"
    custom_suffix: EXPR
) =>
    VAR _BaseFormat =
        DaxLib.FormatString.Component.DecimalPlaces( "#,##0", decimal_places )

    VAR _Prefix =
        DaxLib.FormatString.Component.MakeStringSafe ( custom_prefix )

    VAR _Suffix =
        DaxLib.FormatString.Component.MakeStringSafe ( custom_suffix )

    VAR _PositiveSymbol =
        DaxLib.FormatString.Component.Symbols ( symbol, "POSITIVE" )

    VAR _NegativeSymbol =
        DaxLib.FormatString.Component.Symbols ( symbol, "NEGATIVE" )

    VAR _PositiveFormat =
        _Prefix
            & SWITCH (
                position,
                "PREFIX",
                    _PositiveSymbol & " " & _BaseFormat,
                "SUFFIX",
                    _BaseFormat & " " & _PositiveSymbol,
                _BaseFormat & " " & _PositiveSymbol
            )
            & _Suffix

    VAR _NegativeFormat =
        _Prefix
            & SWITCH (
                position,
                "PREFIX",
                    _NegativeSymbol & " " & _BaseFormat,
                "SUFFIX",
                    _BaseFormat & " " & _NegativeSymbol,
                _BaseFormat & " " & _NegativeSymbol
            )
            & _Suffix

    VAR _ZeroFormat =
        _Prefix & _BaseFormat & _Suffix

    RETURN
        _PositiveFormat & ";" & _NegativeFormat
            & ";"
            & _ZeroFormat