package configui

import (
	"embed"
	"encoding/json"
	"errors"
	"fmt"
	"html/template"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"sync"
	"time"

	"kumoly.io/lib/klog"
	"kumoly.io/lib/ksrv/engine"
	"kumoly.io/tools/configui/public"
)

const UNIX_SHELL = "/usr/bin/sh"
const WIN_SHELL = "C:\\Windows\\System32\\cmd"
const DARWIN_SHELL = "/bin/bash"

const version = "v0.1.14"

//go:embed templates
var tmplFS embed.FS

//go:embed schema.json
var SCHEMA []byte

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

type Action struct {
	Name string        `json:"name"`
	Cmd  string        `json:"cmd"`
	run  chan struct{} `json:"-"`
	pid  int           `json:"-"`
}

type Integration struct {
	Name        string                 `json:"name"`
	Description string                 `json:"description"`
	Cmd         func() (string, error) `json:"-"`
	run         chan struct{}          `json:"-"`
}

type ConfigUI struct {
	AppName    string `json:"app_name"`
	Prod       bool   `json:"production"`
	BaseUrl    string `json:"base_url"`
	ConfigPath string `json:"config_path"`
	SHELL      string `json:"shell"`

	NoReconfig bool   `json:"no_reconfig"`
	AllowIP    string `json:"allow_ip"`
	CmdTimeout string `json:"timeout"`
	cmdTimeout time.Duration

	Files        []*File `json:"files"`
	fileIndex    map[string]int
	Actions      []Action       `json:"actions"`
	Integrations []*Integration `json:"integrations,omitempty"`

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

	// Should be in main app
	LogPath  string      `json:"log_path"`
	LogLevel klog.Llevel `json:"log_level"`

	TmplFS     embed.FS `json:"-"`
	CustTmpl   string   `json:"cust,omitempty"`
	tmpl       *engine.Engine
	PublicFS   embed.FS `json:"-"`
	log        *klog.Logger
	ksrv_log   *klog.Logger
	f          *os.File
	configLock sync.Mutex
}

func New() *ConfigUI {
	tmpl := engine.Must(engine.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
		},
		"normal": func(name string) string {
			return strings.ReplaceAll(name, " ", "-")
		},
	}).ParseFS(tmplFS, "templates/*.tmpl", "templates/**/*.tmpl"))
	sh := ""
	switch runtime.GOOS {
	case "darwin":
		sh = DARWIN_SHELL
	case "windows":
		sh = WIN_SHELL
	default:
		sh = UNIX_SHELL
	}
	return &ConfigUI{
		fileIndex:  map[string]int{},
		SHELL:      sh,
		Prod:       true,
		AppName:    "ConfigUI",
		BaseUrl:    "/",
		Actions:    []Action{{Name: "User", Cmd: "whoami"}},
		PublicFS:   public.FS,
		TmplFS:     tmplFS,
		tmpl:       tmpl,
		CmdTimeout: "10s",
		cmdTimeout: time.Second * 10,
		LogLevel:   klog.Lerror | klog.Linfo,
		log:        klog.Sub("ConfigUI"),
	}
}

func (cui *ConfigUI) File(file_name string) (*File, error) {
	if file_name == cui.AppName {
		return &File{
			Path:  cui.ConfigPath,
			Name:  cui.AppName,
			Lang:  "json",
			owner: cui,
		}, 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.Path == "" {
			continue
		}
		if f.Name == "" {
			f.Name = f.Path
		}
		f.owner = cui
		tmpIndex[f.Name] = i

		// deprecated fix
		if f.Cmd == "" && f.Action != "" {
			f.Cmd = f.Action
			f.Action = ""
		}
	}

	// copy
	cui.configLock.Lock()
	defer cui.configLock.Unlock()
	cui.fileIndex = tmpIndex
	cui.Files = tmpConf.Files
	cui.AllowIP = tmpConf.AllowIP
	cui.Prod = tmpConf.Prod
	klog.PROD = cui.Prod
	cui.ConfigPath = tmpConf.ConfigPath
	cui.HideConfig = tmpConf.HideConfig
	cui.NoReconfig = tmpConf.NoReconfig
	cui.ResultBellow = tmpConf.ResultBellow
	cui.SHELL = tmpConf.SHELL

	cui.CustTmpl = tmpConf.CustTmpl
	if cui.CustTmpl != "" {
		ntmpl, err := cui.tmpl.OverrideGlob(filepath.Join(cui.CustTmpl, "*.tmpl"))
		if err != nil {
			cui.log.Error(err)
		} else {
			cui.tmpl = ntmpl
		}
	}

	cui.Actions = tmpConf.Actions
	for i := range cui.Actions {
		if cui.Actions[i].Name == "" {
			cui.Actions[i].Name = cui.Actions[i].Cmd
		}
	}

	cui.AppName = tmpConf.AppName
	if cui.AppName == "" {
		cui.AppName = "ConfigUI"
	}

	cui.BaseUrl = tmpConf.BaseUrl
	if cui.BaseUrl == "" {
		cui.BaseUrl = "/"
	}

	ct, err := time.ParseDuration(tmpConf.CmdTimeout)
	if err != nil || cui.CmdTimeout == "" {
		cui.CmdTimeout = "10s"
		cui.cmdTimeout = time.Second * 10
	} else {
		cui.CmdTimeout = tmpConf.CmdTimeout
		cui.cmdTimeout = ct
	}

	cui.log = klog.Sub(cui.AppName)

	cui.LogLevel = tmpConf.LogLevel
	if cui.LogLevel == 0 {
		cui.LogLevel = klog.Lerror | klog.Linfo
	}
	klog.LEVEL = cui.LogLevel
	cui.LogPath = tmpConf.LogPath
	cui.setLog()
	// fmt.Printf("%+v", cui)
	return nil
}

func (cui *ConfigUI) setLog() {
	var err error
	if cui.f != nil {
		cui.f.Close()
	}
	if cui.LogPath != "" {
		cui.f, err = os.OpenFile(cui.LogPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
		if err != nil {
			cui.log.Error(err)
		}
		cui.log.SetErrOutput(cui.f)
		cui.log.SetOutput(cui.f)
		if cui.ksrv_log != nil {
			cui.ksrv_log.SetErrOutput(cui.f)
			cui.ksrv_log.SetOutput(cui.f)
		}
	} else {
		cui.log.SetErrOutput(os.Stderr)
		cui.log.SetOutput(os.Stderr)
		if cui.ksrv_log != nil {
			cui.ksrv_log.SetErrOutput(os.Stderr)
			cui.ksrv_log.SetOutput(os.Stderr)
		}
	}
}

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

func (cui *ConfigUI) AppendFile(file *File) error {
	if file.Name == "" {
		file.Name = file.Path
	}
	file.owner = cui
	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
}