package build

import (
	"git.akyoto.dev/cli/q/src/build/expression"
	"git.akyoto.dev/cli/q/src/build/token"
	"git.akyoto.dev/cli/q/src/errors"
)

// CompileInstruction compiles a single instruction.
func (f *Function) CompileInstruction(instruction token.List) error {
	if instruction[0].Kind == token.Keyword {
		return f.CompileKeyword(instruction)
	}

	expr := expression.Parse(instruction)

	if expr == nil {
		return nil
	}

	defer expr.Close()

	switch true {
	case isVariableDefinition(expr):
		return f.CompileVariableDefinition(expr)

	case isAssignment(expr):
		return f.CompileAssignment(expr)

	case isFunctionCall(expr):
		return f.CompileFunctionCall(expr)

	default:
		return errors.New(&errors.InvalidInstruction{Instruction: expr.Token.Text()}, f.File, expr.Token.Position)
	}
}