package archetype

import (
	"fmt"
	"os"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
)

type Config struct {
	Adapter           Adapter // adapter for this instance
	Root              string  // root of the site data
	StaticRoot        string  // root of static files for StaticFileManager
	StaticShowHidden  bool    // whether to show hidden files in the FileManager
	StaticShowHTML    bool    // whether to show html files in the FileManager
	StaticMaxUploadMB int64   // max size in MB of files uploaded via FileManager
	AssetRoot         string  // root of Nirvash dist files (CSS, images)
	ListenAddress     string  // address the webserver listens on
	Plugins           map[string]interface{}
}

func GetConfigLocation() string {
	home := os.Getenv("HOME")
	appdata := os.Getenv("APPDATA")
	switch runtime.GOOS {
	case "windows":
		return filepath.Join(appdata, "nirvash")
	case "darwin":
		return filepath.Join(home, "Library", "Application Support", "nirvash")
	case "plan9":
		return filepath.Join(home, "lib", "nirvash")
	default:
		return filepath.Join(home, ".config", "nirvash")
	}
}

func ensureConfigLocationExists() {
	fileInfo, err := os.Stat(GetConfigLocation())

	if os.IsNotExist(err) {
		os.MkdirAll(GetConfigLocation(), os.ModePerm)
	} else if !fileInfo.IsDir() {
		panic("Config location is not a directory!")
	}
}

func ReadConfig() *Config {
	ensureConfigLocationExists()
	return parseConfig(filepath.Join(GetConfigLocation(), "nirvash.conf"))
}

func (self *Config) Write() error {
	ensureConfigLocationExists()
	return writeConfig(self, filepath.Join(GetConfigLocation(), "nirvash.conf"))
}

func (self *Config) SetAdapter(adapter string) {
	switch adapter {
	case "eureka":
		self.Adapter = &EurekaAdapter{}
	default:
		panic("Unsupported adapter! Try one of [ eureka ]")
	}
}

func (self *Config) IsNull() bool {
	// zero-values for StaticShowHTML, StaticShowHidden, and StaticMaxUploadMB are valid
	// zero-value for ListenAddress is also OK, falls back on 127.0.0.1:8080
	return self.Adapter == nil || len(self.Root) == 0 || len(self.StaticRoot) == 0 || len(self.AssetRoot) == 0
}

func (self *Config) RunWizard() {
	fmt.Printf("All options are required.\n")
	defer func(cfg *Config) {
		if r := recover(); r != nil {
			fmt.Printf("Invalid selection, starting over...")
			cfg.RunWizard()
		}
	}(self)
	inputBuf := ""
	fmt.Printf("adapter? (eureka) [eureka] ")
	fmt.Scanln(&inputBuf)
	if len(strings.TrimSpace(inputBuf)) == 0 {
		inputBuf = "eureka"
	}
	self.SetAdapter(inputBuf)

	inputBuf = ""
	fmt.Printf("site data root? ")
	ensureNonEmptyOption(&inputBuf)
	self.Root = inputBuf

	inputBuf = ""
	fmt.Printf("static file root? ")
	ensureNonEmptyOption(&inputBuf)
	self.StaticRoot = inputBuf

	inputBuf = ""
	fmt.Printf("show HTML files in file manager? ")
	self.StaticShowHTML = ensureBooleanOption(&inputBuf)

	inputBuf = ""
	fmt.Printf("show hidden files in file manager? ")
	self.StaticShowHidden = ensureBooleanOption(&inputBuf)

	inputBuf = ""
	fmt.Printf("max upload size (MB)? ")
	self.StaticMaxUploadMB = ensureNumberOption(&inputBuf)

	inputBuf = ""
	fmt.Printf("nirvash asset root? ")
	ensureNonEmptyOption(&inputBuf)
	self.AssetRoot = inputBuf

	inputBuf = ""
	fmt.Printf("nirvash listen address? ")
	ensureNonEmptyOption(&inputBuf)
	self.ListenAddress = inputBuf

	inputBuf = ""
	fmt.Printf("plugins? (not implemented yet) ")
	ensureNonEmptyOption(&inputBuf)
	//self.Plugins = processPlugins(inputBuf)

	fmt.Printf("Configuration complete!\n")
	self.Write()
}

func ensureNonEmptyOption(buffer *string) {
	for {
		fmt.Scanln(buffer)
		if len(strings.TrimSpace(*buffer)) != 0 {
			break
		}
		fmt.Println("Please enter a nonempty value")
	}
}

func ensureBooleanOption(buffer *string) bool {
	for {
		fmt.Scanln(buffer)
		trimmedBuf := strings.TrimSpace(*buffer)
		v, err := strconv.ParseBool(trimmedBuf)
		if err == nil {
			return v
		}
		fmt.Println("Please enter a true or false value")
	}
}

func ensureNumberOption(buffer *string) int64 {
	for {
		fmt.Scanln(buffer)
		trimmedBuf := strings.TrimSpace(*buffer)
		v, err := strconv.ParseInt(trimmedBuf, 10, 64)
		if err == nil && v > 0 {
			return v
		}
		fmt.Println("Please enter a positive integer")
	}
}

func writeConfig(cfg *Config, configFile string) error {
	f, err := os.Create(configFile)
	if err != nil {
		return err
	}

	defer f.Close()

	f.WriteString("root=" + cfg.Root + "\n")
	f.WriteString("staticRoot=" + cfg.StaticRoot + "\n")
	f.WriteString("staticShowHTML=" + strconv.FormatBool(cfg.StaticShowHTML) + "\n")
	f.WriteString("staticShowHidden=" + strconv.FormatBool(cfg.StaticShowHidden) + "\n")
	f.WriteString("staticMaxUploadMB=" + strconv.FormatInt(cfg.StaticMaxUploadMB, 10) + "\n")
	f.WriteString("assetRoot=" + cfg.AssetRoot + "\n")
	f.WriteString("listenAddress=" + cfg.ListenAddress + "\n")
	f.WriteString("adapter=" + cfg.Adapter.Name() + "\n")
	f.WriteString("plugins=\n")
	return nil
}

func parseConfig(configFile string) *Config {
	f, err := os.ReadFile(configFile)
	cfg := &Config{}
	if err != nil {
		return cfg
	}

	fileData := string(f[:])

	lines := strings.Split(fileData, "\n")

	for _, l := range lines {
		if len(l) == 0 {
			continue
		}
		if !strings.Contains(l, "=") {
			panic("Malformed config not in INI format")
		}

		kvp := strings.Split(l, "=")
		k := strings.TrimSpace(kvp[0])
		v := strings.TrimSpace(kvp[1])
		switch k {
		case "root":
			cfg.Root = v
		case "staticRoot":
			cfg.StaticRoot = v
		case "staticShowHTML":
			cfg.StaticShowHTML, _ = strconv.ParseBool(v)
		case "staticShowHidden":
			cfg.StaticShowHidden, _ = strconv.ParseBool(v)
		case "staticMaxUploadMB":
			cfg.StaticMaxUploadMB, _ = strconv.ParseInt(v, 10, 64)
		case "assetRoot":
			cfg.AssetRoot = v
		case "listenAddress":
			cfg.ListenAddress = v
		case "plugins":
			// not implemented
		case "adapter":
			cfg.SetAdapter(v)
		default:
			panic("Unrecognized config option: " + k)
		}
	}
	return cfg
}