package sriracha

import (
	"io"
	"log"
	"reflect"
	"strings"
)

type Extension interface {
	Description() string

	Data() interface{} // TODO reflect to see desired data types and default values
	// populate like in gohan
}

var (
	allExtensions     []Extension
	allExtensionNames []string
)

func AddExtension(e Extension) {
	for _, ext := range allExtensions {
		if ext == e {
			return
		}
	}
	allExtensions = append(allExtensions, e)
	allExtensionNames = append(allExtensionNames, extensionName(e))
}

func extensionName(e Extension) string {
	name := reflect.ValueOf(e).Type().String()
	if name[0] == '*' {
		name = name[1:]
	}
	if strings.HasPrefix(name, "extension.") {
		name = name[10:]
	}
	return strings.ToUpper(name[0:1]) + name[1:]
}

func attach(file io.Reader, size int64, mime string) (*Attachment, error) {
	for i, ext := range allExtensions {
		if extension, ok := ext.(ExtensionAttach); ok {
			log.Println("DEBUG ATTACH", allExtensionNames[i])
			a, err := extension.Attach(file, size, mime)
			if err != nil {
				return nil, err
			} else if a != nil {
				return a, nil
			}
		}

	}
	return nil, nil
}

func post(p *Post) error {
	for i, ext := range allExtensions {
		if extension, ok := ext.(ExtensionPost); ok {
			log.Println("DEBUG POST", allExtensionNames[i])
			err := extension.Post(p)
			if err != nil {
				return err
			}
		}
	}
	return nil
}