package config

import (
	"errors"
	"os"
	"path/filepath"
	"runtime"
	"time"

	"github.com/BurntSushi/toml"
	"github.com/mitchellh/go-homedir"
)

var ContentTypes = map[string]string{
	"json":      "application/json",
	"form":      "application/x-www-form-urlencoded",
	"multipart": "multipart/form-data",
}

// Duration is used to automatically unmarshal timeout strings to
// time.Duration values
type Duration struct {
	time.Duration
}

func (d *Duration) UnmarshalText(text []byte) error {
	var err error
	d.Duration, err = time.ParseDuration(string(text))
	return err
}

type Config struct {
	General GeneralOptions
	Keys    map[string]map[string]string
}

type GeneralOptions struct {
	ContextSpecificSearch  bool
	DefaultURLScheme       string
	Editor                 string
	FollowRedirects        bool
	FormatJSON             bool
	Insecure               bool
	PreserveScrollPosition bool
	StatusLine             string
	TLSVersionMax          uint16
	TLSVersionMin          uint16
	Timeout                Duration
}

var defaultTimeoutDuration, _ = time.ParseDuration("1m")

var DefaultKeys = map[string]map[string]string{
	"global": {
		"CtrlR": "submit",
		"CtrlC": "quit",
		"CtrlS": "saveResponse",
		"CtrlF": "loadRequest",
		"CtrlE": "saveRequest",
		"CtrlD": "deleteLine",
		"CtrlW": "deleteWord",
		"CtrlO": "openEditor",
		"CtrlT": "toggleContextSpecificSearch",
		"CtrlX": "clearHistory",
		"Tab":   "nextView",
		"CtrlJ": "nextView",
		"CtrlK": "prevView",
		"AltH":  "history",
		"F2":    "focus url",
		"F3":    "focus get",
		"F4":    "focus method",
		"F5":    "focus data",
		"F6":    "focus headers",
		"F7":    "focus search",
		"F8":    "focus response-headers",
		"F9":    "focus response-body",
		"F11":   "redirectRestriction",
	},
	"url": {
		"Enter": "submit",
	},
	"response-headers": {
		"ArrowUp":   "scrollUp",
		"ArrowDown": "scrollDown",
		"PageUp":    "pageUp",
		"PageDown":  "pageDown",
	},
	"response-body": {
		"ArrowUp":   "scrollUp",
		"ArrowDown": "scrollDown",
		"PageUp":    "pageUp",
		"PageDown":  "pageDown",
	},
	"help": {
		"ArrowUp":   "scrollUp",
		"ArrowDown": "scrollDown",
		"PageUp":    "pageUp",
		"PageDown":  "pageDown",
	},
}

var DefaultConfig = Config{
	General: GeneralOptions{
		DefaultURLScheme:       "https",
		Editor:                 "vim",
		FollowRedirects:        true,
		FormatJSON:             true,
		Insecure:               false,
		PreserveScrollPosition: true,
		StatusLine:             "[wuzz {{.Version}}]{{if .Duration}} [Response time: {{.Duration}}]{{end}} [Request no.: {{.RequestNumber}}/{{.HistorySize}}] [Search type: {{.SearchType}}]{{if .DisableRedirect}} [Redirects Restricted Mode {{.DisableRedirect}}]{{end}}",
		Timeout: Duration{
			defaultTimeoutDuration,
		},
	},
}

func init() {
	if os.Getenv("EDITOR") != "" {
		DefaultConfig.General.Editor = os.Getenv("EDITOR")
	}
}

func LoadConfig(configFile string) (*Config, error) {
	if _, err := os.Stat(configFile); os.IsNotExist(err) {
		return nil, errors.New("Config file does not exist.")
	} else if err != nil {
		return nil, err
	}

	conf := DefaultConfig
	if _, err := toml.DecodeFile(configFile, &conf); err != nil {
		return nil, err
	}

	if conf.Keys == nil {
		conf.Keys = DefaultKeys
	} else {
		// copy default keys
		for keyCategory, keys := range DefaultKeys {
			confKeys, found := conf.Keys[keyCategory]
			if found {
				for key, action := range keys {
					if _, found := confKeys[key]; !found {
						conf.Keys[keyCategory][key] = action
					}
				}
			} else {
				conf.Keys[keyCategory] = keys
			}
		}
	}

	return &conf, nil
}

func GetDefaultConfigLocation() string {
	var configFolderLocation string
	switch runtime.GOOS {
	case "linux":
		// Use the XDG_CONFIG_HOME variable if it is set, otherwise
		// $HOME/.config/wuzz/config.toml
		xdgConfigHome := os.Getenv("XDG_CONFIG_HOME")
		if xdgConfigHome != "" {
			configFolderLocation = xdgConfigHome
		} else {
			configFolderLocation, _ = homedir.Expand("~/.config/wuzz/")
		}

	default:
		// On other platforms we just use $HOME/.wuzz
		configFolderLocation, _ = homedir.Expand("~/.wuzz/")
	}

	return filepath.Join(configFolderLocation, "config.toml")
}