package tins2020

import (
	"bufio"
	"fmt"
	"strings"

	"opslag.de/schobers/zntg/ui"
)

type ResourceLoader struct {
	Resources map[string]string
}

func NewResourceLoader() *ResourceLoader {
	return &ResourceLoader{}
}

func (l *ResourceLoader) parseResourcesFile(res ui.Resources, name string) error {
	f, err := res.OpenResource(name)
	if err != nil {
		return err
	}
	defer f.Close()

	l.Resources = map[string]string{}
	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		definition := scanner.Text()
		sep := strings.Index(definition, ":")
		if sep == -1 {
			continue
		}
		name := strings.TrimSpace(definition[:sep])
		content := strings.TrimSpace(definition[sep+1:])
		l.Resources[name] = content
	}
	return nil
}

func (l *ResourceLoader) LoadFromFile(res ui.Resources, name string, action func(string, string) error) error {
	err := l.parseResourcesFile(res, name)
	if err != nil {
		return err
	}
	for name, content := range l.Resources {
		err = action(name, content)
		if err != nil {
			return fmt.Errorf("cannot load resource '%s'; error: %v", name, err)
		}
	}
	return nil
}