package analyzer

import "git.tebibyte.media/arf/arf/file"
import "git.tebibyte.media/arf/arf/parser"
import "git.tebibyte.media/arf/arf/infoerr"

// Argument represents a value that can be placed anywhere a value goes. This
// allows things like phrases being arguments to other phrases.
type Argument interface {
	// Phrase
	// List
	// Dereference
	// Variable
	// IntLiteral
	// UIntLiteral
	// FloatLiteral
	// StringLiteral

	What     () (what Type)
	Location () (location file.Location)
	NewError (message string, kind infoerr.ErrorKind) (err error)
	ToString (indent int) (output string)
	canBePassedAs (what Type) (allowed bool)
}

// phrase
// 	is what
// list
// 	is what
// dereference
// 	if length is greater than 1
// 		length is 1
// 		is what (ignore length)
// 	else
// 		is points of reduced of what
// variable
// 	is what
// int
// 	primitive is basic signed | float
// 	length is 1
// uint
// 	primitive is basic signed | unsigned | float
// 	length is 1
// float
// 	primitive is basic float
// 	length is 1
// string
// 	primitive is basic signed | unsigned | float
//	length is equal
//	or
//	reduced is variable array
//	reduced points to signed | unsigned | float
//	length is 1

// analyzeArgument analyzes an argument
func (analyzer analysisOperation) analyzeArgument (
	inputArgument parser.Argument,
) (
	outputArgument Argument,
	err error,
) {
	switch inputArgument.Kind() {
	case parser.ArgumentKindNil:
		panic("invalid state: attempt to analyze nil argument")
		
	case parser.ArgumentKindPhrase:
		// TODO
		
	case parser.ArgumentKindDereference:
		// TODO
		
	case parser.ArgumentKindList:
		// TODO
		
	case parser.ArgumentKindIdentifier:
		// TODO
		
	case parser.ArgumentKindDeclaration:
		// TODO
		
	case parser.ArgumentKindInt:
		outputArgument = IntLiteral {
			value: inputArgument.Value().(int64),
			locatable: locatable {
				location: inputArgument.Location(),
			},
		}
		
	case parser.ArgumentKindUInt:
		outputArgument = UIntLiteral {
			value: inputArgument.Value().(uint64),
			locatable: locatable {
				location: inputArgument.Location(),
			},
		}
		
	case parser.ArgumentKindFloat:
		outputArgument = FloatLiteral {
			value: inputArgument.Value().(float64),
			locatable: locatable {
				location: inputArgument.Location(),
			},
		}
		
	case parser.ArgumentKindString:
		outputArgument = StringLiteral {
			value: inputArgument.Value().(string),
			locatable: locatable {
				location: inputArgument.Location(),
			},
		}
	}
	return
}