package data

import (
	"encoding/json"
	"errors"
	"fmt"
	"os"
)

type (
	Data struct {
		Softwares []Software
	}

	Software struct {
		Slug           string         `json:"slug"`
		Name           string         `json:"name"`
		Description    string         `json:"description"`
		Version        string         `json:"version"`
		IconURL        string         `json:"icon_url"`
		ScreenshotURLs []string       `json:"screenshot_urls"`
		DownloadLinks  []DownloadLink `json:"download_links"`
	}

	DownloadLink struct {
		OS   string `json:"os"`
		Arch string `json:"arch"`
		URL  string `json:"url"`
	}

	document struct {
		Softwares []Software `json:"softwares"`
	}
)

func Load(path string) (Data, error) {
	f, err := os.OpenFile(path, os.O_RDONLY, 0)
	if err != nil {
		if errors.Is(err, os.ErrNotExist) {
			return Data{}, nil
		}
		return Data{}, fmt.Errorf("failed to open data file: %w", err)
	}
	defer f.Close()

	var s document
	d := json.NewDecoder(f)
	err = d.Decode(&s)
	if err != nil {
		return Data{}, fmt.Errorf("failed to parse data file: %w", err)
	}

	return Data(s), nil
}

func Save(doc Data, path string) error {
	f, err := os.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0740)
	if err != nil {
		return fmt.Errorf("failed to open data file: %w", err)
	}
	defer f.Close()

	e := json.NewEncoder(f)
	err = e.Encode(document(doc))
	if err != nil {
		return err
	}

	return nil
}