package configui

import (
	"embed"
	"encoding/json"
	"errors"
	"fmt"
	"html/template"

	"kumoly.io/tools/configui/public"
)

var UNIX_SHELL = "sh"
var WIN_SHELL = "cmd"

const version = "0.1.2-rc1"
const build = "97d2e08"

//go:embed templates
var tmplFS embed.FS

var Ext2Mode map[string]string = map[string]string{
	"go":   "golang",
	"log":  "sh",
	"txt":  "text",
	"yml":  "yaml",
	"conf": "ini",
}

type ConfigUI struct {
	AppName    string `json:"app_name"`
	ConfigPath string `json:"config_path"`

	NoReconfig bool   `json:"no_reconfig"`
	AllowIP    string `json:"allow_ip"`

	Files     []*File `json:"files"`
	fileIndex map[string]int

	// TODO
	ResultBellow bool `json:"result_bellow"`
	HideConfig   bool `json:"hide_config"`

	// Should be in main app
	LogPath      string `json:"log_path"`
	SilentSysOut bool   `json:"silent_sys_out"`

	TmplFS   embed.FS `json:"-"`
	tmpl     *template.Template
	PublicFS embed.FS `json:"-"`
}

func New() *ConfigUI {
	tmpl := template.Must(template.New("").Funcs(template.FuncMap{
		"step": func(from, to, step uint) []uint {
			items := []uint{}
			for i := from; i <= to; i += step {
				items = append(items, i)
			}
			return items
		},
	}).ParseFS(tmplFS, "templates/*.tmpl", "templates/**/*.tmpl"))
	return &ConfigUI{
		fileIndex: map[string]int{},
		AppName:   "ConfigUI",
		PublicFS:  public.FS,
		TmplFS:    tmplFS,
		tmpl:      tmpl,
	}
}

func (cui *ConfigUI) File(file_name string) (*File, error) {
	if file_name == cui.AppName {
		return &File{
			Path: cui.ConfigPath,
			Name: cui.AppName,
			Lang: "json",
		}, nil
	}
	index, ok := cui.fileIndex[file_name]
	if !ok {
		return nil, errors.New("no file found")
	}
	return cui.Files[index], nil
}

func (cui *ConfigUI) LoadConfig(confstr string) error {
	tmpConf := &ConfigUI{}
	err := json.Unmarshal([]byte(confstr), tmpConf)
	if err != nil {
		return nil
	}

	// construct fileIndex
	tmpIndex := map[string]int{}
	for i, f := range tmpConf.Files {
		if f.Name == "" {
			f.Name = f.Path
		}
		tmpIndex[f.Name] = i
	}

	// copy
	cui.fileIndex = tmpIndex
	cui.Files = tmpConf.Files
	cui.AllowIP = tmpConf.AllowIP
	cui.ConfigPath = tmpConf.ConfigPath
	cui.HideConfig = tmpConf.HideConfig
	cui.LogPath = tmpConf.LogPath
	cui.NoReconfig = tmpConf.NoReconfig
	cui.AppName = tmpConf.AppName

	// NOT implemented
	cui.ResultBellow = tmpConf.ResultBellow
	cui.SilentSysOut = tmpConf.SilentSysOut
	// fmt.Printf("%+v", cui)
	return nil
}

func (cui *ConfigUI) Config() ([]byte, error) {
	return json.MarshalIndent(cui, "", "  ")
}

func (cui *ConfigUI) AppendFile(file *File) error {
	if file.Name == "" {
		file.Name = file.Path
	}
	i, ok := cui.fileIndex[file.Name]
	if ok {
		return fmt.Errorf("%v already exists at %d", file.Name, i)
	}
	cui.fileIndex[file.Name] = len(cui.Files)
	cui.Files = append(cui.Files, file)
	return nil
}