package generator

import (
	"go-common/app/tool/gengo/types"
)

// DefaultPackage contains a default implementation of Package.
type DefaultPackage struct {
	// Short name of package, used in the "package xxxx" line.
	PackageName string
	// Import path of the package, and the location on disk of the package.
	PackagePath string

	// Emitted at the top of every file.
	HeaderText []byte

	// Emitted only for a "doc.go" file; appended to the HeaderText for
	// that file.
	PackageDocumentation []byte

	// If non-nil, will be called on "Generators"; otherwise, the static
	// list will be used. So you should set only one of these two fields.
	GeneratorFunc func(*Context) []Generator
	GeneratorList []Generator

	// Optional; filters the types exposed to the generators.
	FilterFunc func(*Context, *types.Type) bool
}

func (d *DefaultPackage) Name() string { return d.PackageName }
func (d *DefaultPackage) Path() string { return d.PackagePath }

func (d *DefaultPackage) Filter(c *Context, t *types.Type) bool {
	if d.FilterFunc != nil {
		return d.FilterFunc(c, t)
	}
	return true
}

func (d *DefaultPackage) Generators(c *Context) []Generator {
	if d.GeneratorFunc != nil {
		return d.GeneratorFunc(c)
	}
	return d.GeneratorList
}

func (d *DefaultPackage) Header(filename string) []byte {
	if filename == "doc.go" {
		return append(d.HeaderText, d.PackageDocumentation...)
	}
	return d.HeaderText
}

var (
	_ = Package(&DefaultPackage{})
)