package parser_test

import (
	"testing"

	"git.sharkk.net/Sharkk/Mako/parser"
)

func TestProgram(t *testing.T) {
	input := `x = 42
y = "hello"
z = true + false`

	l := parser.NewLexer(input)
	p := parser.NewParser(l)
	program := p.ParseProgram()
	checkParserErrors(t, p)

	if len(program.Statements) != 3 {
		t.Fatalf("expected 3 statements, got %d", len(program.Statements))
	}

	expectedIdentifiers := []string{"x", "y", "z"}
	for i, expectedIdent := range expectedIdentifiers {
		stmt, ok := program.Statements[i].(*parser.Assignment)
		if !ok {
			t.Fatalf("statement %d: expected AssignStatement, got %T", i, program.Statements[i])
		}

		ident, ok := stmt.Target.(*parser.Identifier)
		if !ok {
			t.Fatalf("statement %d: expected Identifier for Name, got %T", i, stmt.Target)
		}

		if ident.Value != expectedIdent {
			t.Errorf("statement %d: expected identifier %s, got %s", i, expectedIdent, ident.Value)
		}
	}
}

func TestMixedStatements(t *testing.T) {
	input := `x = 42
if x then
	y = "hello"
	if true then
		z = {1, 2, 3}
	end
end
arr = {a = 1, b = 2}`

	l := parser.NewLexer(input)
	p := parser.NewParser(l)
	program := p.ParseProgram()
	checkParserErrors(t, p)

	if len(program.Statements) != 3 {
		t.Fatalf("expected 3 statements, got %d", len(program.Statements))
	}

	// First statement: assignment
	stmt1, ok := program.Statements[0].(*parser.Assignment)
	if !ok {
		t.Fatalf("statement 0: expected AssignStatement, got %T", program.Statements[0])
	}
	ident1, ok := stmt1.Target.(*parser.Identifier)
	if !ok {
		t.Fatalf("expected Identifier for Name, got %T", stmt1.Target)
	}
	if ident1.Value != "x" {
		t.Errorf("expected identifier 'x', got %s", ident1.Value)
	}

	// Second statement: if statement
	stmt2, ok := program.Statements[1].(*parser.IfStatement)
	if !ok {
		t.Fatalf("statement 1: expected IfStatement, got %T", program.Statements[1])
	}
	if len(stmt2.Body) != 2 {
		t.Errorf("expected 2 body statements, got %d", len(stmt2.Body))
	}

	// Third statement: table assignment
	stmt3, ok := program.Statements[2].(*parser.Assignment)
	if !ok {
		t.Fatalf("statement 2: expected AssignStatement, got %T", program.Statements[2])
	}
	table, ok := stmt3.Value.(*parser.TableLiteral)
	if !ok {
		t.Fatalf("expected TableLiteral value, got %T", stmt3.Value)
	}
	if table.IsArray() {
		t.Error("expected hash table, got array")
	}
}

func TestMemberAccessProgram(t *testing.T) {
	input := `table = {key = "value", nested = {inner = 42}}
table.key = "new value"
table["key"] = "bracket syntax"
table.nested.inner = 100
echo table[table.key]`

	l := parser.NewLexer(input)
	p := parser.NewParser(l)
	program := p.ParseProgram()
	checkParserErrors(t, p)

	if len(program.Statements) != 5 {
		t.Fatalf("expected 5 statements, got %d", len(program.Statements))
	}

	// Second statement: dot assignment
	stmt2, ok := program.Statements[1].(*parser.Assignment)
	if !ok {
		t.Fatalf("statement 1: expected AssignStatement, got %T", program.Statements[1])
	}
	_, ok = stmt2.Target.(*parser.DotExpression)
	if !ok {
		t.Fatalf("expected DotExpression for assignment target, got %T", stmt2.Target)
	}

	// Third statement: bracket assignment
	stmt3, ok := program.Statements[2].(*parser.Assignment)
	if !ok {
		t.Fatalf("statement 2: expected AssignStatement, got %T", program.Statements[2])
	}
	_, ok = stmt3.Target.(*parser.IndexExpression)
	if !ok {
		t.Fatalf("expected IndexExpression for assignment target, got %T", stmt3.Target)
	}

	// Fourth statement: chained dot assignment
	stmt4, ok := program.Statements[3].(*parser.Assignment)
	if !ok {
		t.Fatalf("statement 3: expected AssignStatement, got %T", program.Statements[3])
	}
	_, ok = stmt4.Target.(*parser.DotExpression)
	if !ok {
		t.Fatalf("expected DotExpression for assignment target, got %T", stmt4.Target)
	}

	// Fifth statement: echo with nested access
	stmt5, ok := program.Statements[4].(*parser.EchoStatement)
	if !ok {
		t.Fatalf("statement 4: expected EchoStatement, got %T", program.Statements[4])
	}
	_, ok = stmt5.Value.(*parser.IndexExpression)
	if !ok {
		t.Fatalf("expected IndexExpression in echo, got %T", stmt5.Value)
	}
}

func TestNestedConditionals(t *testing.T) {
	input := `if a then
	if b then
		x = 1
	elseif c then
		x = 2
	else
		x = 3
	end
	y = 4
elseif d then
	z = 5
else
	w = 6
end`

	l := parser.NewLexer(input)
	p := parser.NewParser(l)
	program := p.ParseProgram()
	checkParserErrors(t, p)

	if len(program.Statements) != 1 {
		t.Fatalf("expected 1 statement, got %d", len(program.Statements))
	}

	outerIf, ok := program.Statements[0].(*parser.IfStatement)
	if !ok {
		t.Fatalf("expected IfStatement, got %T", program.Statements[0])
	}

	// Outer if should have 2 body statements: nested if and assignment
	if len(outerIf.Body) != 2 {
		t.Fatalf("expected 2 body statements, got %d", len(outerIf.Body))
	}

	// First body statement should be nested if
	nestedIf, ok := outerIf.Body[0].(*parser.IfStatement)
	if !ok {
		t.Fatalf("expected nested IfStatement, got %T", outerIf.Body[0])
	}

	// Nested if should have 1 elseif and 1 else
	if len(nestedIf.ElseIfs) != 1 {
		t.Errorf("expected 1 elseif in nested if, got %d", len(nestedIf.ElseIfs))
	}

	if len(nestedIf.Else) != 1 {
		t.Errorf("expected 1 else statement in nested if, got %d", len(nestedIf.Else))
	}

	// Outer if should have 1 elseif and 1 else
	if len(outerIf.ElseIfs) != 1 {
		t.Errorf("expected 1 elseif in outer if, got %d", len(outerIf.ElseIfs))
	}

	if len(outerIf.Else) != 1 {
		t.Errorf("expected 1 else statement in outer if, got %d", len(outerIf.Else))
	}
}

func TestComplexExpressions(t *testing.T) {
	input := `result = (0xFF + 0b1010) * 1e2
if result then
	table = {
		hex = 0xDEAD,
		bin = 0b1111,
		sci = 1.5e-3,
		str = [[multiline
string]]
	}
end`

	l := parser.NewLexer(input)
	p := parser.NewParser(l)
	program := p.ParseProgram()
	checkParserErrors(t, p)

	if len(program.Statements) != 2 {
		t.Fatalf("expected 2 statements, got %d", len(program.Statements))
	}

	// First statement: complex expression assignment
	stmt1, ok := program.Statements[0].(*parser.Assignment)
	if !ok {
		t.Fatalf("expected AssignStatement, got %T", program.Statements[0])
	}

	// Should be a complex infix expression
	_, ok = stmt1.Value.(*parser.InfixExpression)
	if !ok {
		t.Fatalf("expected InfixExpression, got %T", stmt1.Value)
	}

	// Second statement: if with table assignment
	stmt2, ok := program.Statements[1].(*parser.IfStatement)
	if !ok {
		t.Fatalf("expected IfStatement, got %T", program.Statements[1])
	}

	if len(stmt2.Body) != 1 {
		t.Fatalf("expected 1 body statement, got %d", len(stmt2.Body))
	}

	bodyStmt, ok := stmt2.Body[0].(*parser.Assignment)
	if !ok {
		t.Fatalf("expected AssignStatement in body, got %T", stmt2.Body[0])
	}

	table, ok := bodyStmt.Value.(*parser.TableLiteral)
	if !ok {
		t.Fatalf("expected TableLiteral, got %T", bodyStmt.Value)
	}

	if len(table.Pairs) != 4 {
		t.Errorf("expected 4 table pairs, got %d", len(table.Pairs))
	}
}

func TestMixedStatementsWithEcho(t *testing.T) {
	input := `x = 42
echo x
if x then
	echo "found x"
end
echo {result = x}`

	l := parser.NewLexer(input)
	p := parser.NewParser(l)
	program := p.ParseProgram()
	checkParserErrors(t, p)

	if len(program.Statements) != 4 {
		t.Fatalf("expected 4 statements, got %d", len(program.Statements))
	}

	// First: assignment
	_, ok := program.Statements[0].(*parser.Assignment)
	if !ok {
		t.Fatalf("statement 0: expected AssignStatement, got %T", program.Statements[0])
	}

	// Second: echo
	echo1, ok := program.Statements[1].(*parser.EchoStatement)
	if !ok {
		t.Fatalf("statement 1: expected EchoStatement, got %T", program.Statements[1])
	}
	testIdentifier(t, echo1.Value, "x")

	// Third: if statement with echo in body
	ifStmt, ok := program.Statements[2].(*parser.IfStatement)
	if !ok {
		t.Fatalf("statement 2: expected IfStatement, got %T", program.Statements[2])
	}

	if len(ifStmt.Body) != 1 {
		t.Fatalf("expected 1 body statement, got %d", len(ifStmt.Body))
	}

	bodyEcho, ok := ifStmt.Body[0].(*parser.EchoStatement)
	if !ok {
		t.Fatalf("if body: expected EchoStatement, got %T", ifStmt.Body[0])
	}
	testStringLiteral(t, bodyEcho.Value, "found x")

	// Fourth: echo with table
	echo2, ok := program.Statements[3].(*parser.EchoStatement)
	if !ok {
		t.Fatalf("statement 3: expected EchoStatement, got %T", program.Statements[3])
	}

	_, ok = echo2.Value.(*parser.TableLiteral)
	if !ok {
		t.Fatalf("expected TableLiteral in echo, got %T", echo2.Value)
	}
}

func TestModuloOperator(t *testing.T) {
	input := `result = 10 % 3`

	l := parser.NewLexer(input)
	p := parser.NewParser(l)
	program := p.ParseProgram()
	checkParserErrors(t, p)

	if len(program.Statements) != 1 {
		t.Fatalf("expected 1 statement, got %d", len(program.Statements))
	}

	stmt, ok := program.Statements[0].(*parser.Assignment)
	if !ok {
		t.Fatalf("expected AssignStatement, got %T", program.Statements[0])
	}

	infix, ok := stmt.Value.(*parser.InfixExpression)
	if !ok {
		t.Fatalf("expected InfixExpression, got %T", stmt.Value)
	}

	if infix.Operator != "%" {
		t.Errorf("expected operator '%%', got %s", infix.Operator)
	}

	leftLit, ok := infix.Left.(*parser.NumberLiteral)
	if !ok {
		t.Fatalf("expected NumberLiteral on left, got %T", infix.Left)
	}
	if leftLit.Value != 10.0 {
		t.Errorf("expected left value 10, got %f", leftLit.Value)
	}

	rightLit, ok := infix.Right.(*parser.NumberLiteral)
	if !ok {
		t.Fatalf("expected NumberLiteral on right, got %T", infix.Right)
	}
	if rightLit.Value != 3.0 {
		t.Errorf("expected right value 3, got %f", rightLit.Value)
	}
}