package main

import (
	"encoding/json"
	"path/filepath"

	tpl "lamium/template"
	util "lamium/util"
)

type (
	// A Config defines settings for album generation.
	Config struct {
		HTMLDir    string    `json:"htmlDir"`
		IndexHTML  string    `json:"indexHTML"`
		IndexTitle string    `json:"indexTitle"`
		IndexType  string    `json:"indexType"`
		ThemeDir   string    `json:"themeDir"`
		Sets       []tpl.Set `json:"sets"`
	}
)

var (
	// Example configuration.
	sampleConfig = Config{
		HTMLDir:    "public_html",
		IndexHTML:  "index.html",
		IndexTitle: "My Album",
		IndexType:  "text",
		ThemeDir:   "themes/nettle",
		Sets: []tpl.Set{
			{
				Name:           "set1",
				ImageDir:       "set1",
				IndexHTML:      "index.html",
				Title:          "Set 1",
				SortOrder:      "modTimeDesc",
				CSSClassIframe: "frame",
				CSSClassLink:   "link",
				CSSClassThumb:  "thumb",
				LightboxOn:     true,
				LinkType:       "page",
				ThumbDir:       "thumbs",
				ThumbWidth:     200,
				ThumbHeight:    200,
				ThumbPct:       0,
				ThumbClip:      "square",
				ThumbUnifyMode: "height",
			},
		},
	}

	// Error messages.
	configErr = struct {
		configNotLoaded string
		jsonNotSaved    string
	}{
		configNotLoaded: "Error: config could not be loaded:",
		jsonNotSaved:    "Error: JSON config could not be saved:",
	}
)

// genConfig outputs an example configuration file at path.
func genConfig(path string) {
	conf, jsonErr := json.MarshalIndent(sampleConfig, "", "  ")
	if !util.HasError(jsonErr, configErr.jsonNotSaved+" "+path, true) {
		util.MakeDir(filepath.Dir(path))
		util.SaveFile(path, string(conf), true)
	}
}

// loadConfig returns a *Config interface of settings after reading
// the configuration file at path.
func loadConfig(path string) *Config {
	contents := util.LoadFile(path, true)
	conf := &Config{}
	json.Unmarshal([]byte(contents), &conf)
	return conf
}