using uCalcSoftware;

var uc = new uCalc();
Console.WriteLine("---- Simple function def ----");
uc.DefineFunction("f(x) = x ^ 2 + 5");
Console.WriteLine(uc.Eval("f(10)"));

Console.WriteLine("---- Function overloading ----");
// Overloading based on parameter type or number of parameters
uc.DefineFunction("MyOverload(x As Double) = x + x");
uc.DefineFunction("MyOverload(x As String) As String = x + x");
uc.DefineFunction("MyOverload(x As String, y As String) As String = x + y");
uc.DefineFunction("MyOverload(x, y) = x + y");
Console.WriteLine(uc.EvalStr("MyOverload(5)"));
Console.WriteLine(uc.EvalStr("MyOverload('Ha')"));
Console.WriteLine(uc.EvalStr("MyOverload('Hello ', 'world!')"));
Console.WriteLine(uc.EvalStr("MyOverload(5, 10)"));

Console.WriteLine("---- Definition hiding/un-hiding ----");
// Shadowing (hiding) definitions
uc.DefineFunction("h(x) = x * 10");
Console.WriteLine(uc.Eval("h(3)"));
var hFunc = uc.DefineFunction("h(x) = x * 100"); // hides previous def
Console.WriteLine(uc.Eval("h(3)"));
hFunc.Release(); // Releasing this restores previous def
Console.WriteLine(uc.Eval("h(3)"));

Console.WriteLine("---- Optional parameters ----");
uc.DefineFunction("Opt(x, y = 5, z As String = 'Hello') = x + y + Length(z)");
Console.WriteLine(uc.Eval("Opt(10)"));
Console.WriteLine(uc.Eval("Opt(10, 20)"));
Console.WriteLine(uc.Eval("Opt(10, 20, 'Just a test 123')"));

Console.WriteLine("---- Recursion ----");
uc.DefineFunction("Factorial(x) = iif(x > 1, x * Factorial(x - 1), 1)");
uc.DefineFunction("Fib(n) = IIf(n < 2, n, Fib(n - 1) + Fib(n - 2))");
Console.WriteLine(uc.Eval("Factorial(5)"));
Console.WriteLine(uc.Eval("Fib(10)"));

// Bootstrap - builds new def on top of existing one
Console.WriteLine("------ Bootstrapping -------");
Console.WriteLine(uc.EvalStr("Hex(123)")); // uses "built-in" version of Hex()

var MyHex = uc.DefineFunction("Hex(number As Int) As String = '0x' + UCase(Hex(number))", bootstrap: true);

Console.WriteLine(uc.EvalStr("Hex(123)"));
MyHex.Release();
Console.WriteLine(uc.EvalStr("Hex(123)"));

// Overwrite - useful for spreadsheet-like functionality
Console.WriteLine("------ Overwrite -------");

uc.DefineFunction("SpreadsheetCell_A1() = 5", overwrite: true);
uc.DefineFunction("SpreadsheetCell_B2() = SpreadsheetCell_A1() * 10", overwrite: true);
uc.DefineFunction("SpreadsheetCell_C3() = SpreadsheetCell_A1() + SpreadsheetCell_B2()", overwrite: true);

Console.WriteLine(uc.Eval("SpreadsheetCell_A1()"));
Console.WriteLine(uc.Eval("SpreadsheetCell_B2()"));
Console.WriteLine(uc.Eval("SpreadsheetCell_C3()"));
// SpreadsheetCell_C3() will be affected by the definition changes of SpreadsheetCell_A1() and  SpreadsheetCell_B3()

uc.DefineFunction("SpreadsheetCell_B2() = SpreadsheetCell_A1() * 100", overwrite: true);
uc.DefineFunction("SpreadsheetCell_A1() = 25", overwrite: true);

Console.WriteLine("-------");
// Note: Empty parenthesis are optional for functions with no parameters
Console.WriteLine(uc.Eval("SpreadsheetCell_A1"));
Console.WriteLine(uc.Eval("SpreadsheetCell_B2"));
Console.WriteLine(uc.Eval("SpreadsheetCell_C3"));

// See Define() topic for more