package internal

import (
	"fmt"
	"path"
	"strings"
	"sync"

	"github.com/cupcakearmy/autorestic/internal/colors"
	"github.com/mitchellh/go-homedir"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

const VERSION = "1.0.0"

var CI bool = false
var VERBOSE bool = false

type Config struct {
	Locations map[string]Location `mapstructure:"locations"`
	Backends  map[string]Backend  `mapstructure:"backends"`
}

var once sync.Once
var config *Config

func GetConfig() *Config {
	if config == nil {
		once.Do(func() {
			if err := viper.ReadInConfig(); err == nil {
				colors.Faint.Println("Using config file:", viper.ConfigFileUsed())
			} else {
				return
			}

			config = &Config{}
			if err := viper.UnmarshalExact(config); err != nil {
				panic(err)
			}
		})
	}
	return config
}

func GetPathRelativeToConfig(p string) (string, error) {
	if path.IsAbs(p) {
		return p, nil
	} else if strings.HasPrefix(p, "~") {
		home, err := homedir.Dir()
		return path.Join(home, strings.TrimPrefix(p, "~")), err
	} else {
		return path.Join(path.Dir(viper.ConfigFileUsed()), p), nil
	}
}

func (c *Config) Describe() {
	// Locations
	for name, l := range c.Locations {
		var tmp string
		colors.PrimaryPrint(`Location: "%s"`, name)

		colors.PrintDescription("From", l.From)

		tmp = ""
		for _, to := range l.To {
			tmp += fmt.Sprintf("\t%s %s\n", colors.Success.Sprint("→"), to)
		}
		colors.PrintDescription("To", tmp)

		if l.Cron != "" {
			colors.PrintDescription("Cron", l.Cron)
		}

		after, before := len(l.Hooks.After), len(l.Hooks.Before)
		if after+before > 0 {
			tmp = ""
			if before > 0 {
				tmp += "\tBefore"
				for _, cmd := range l.Hooks.Before {
					tmp += colors.Faint.Sprintf("\n\t  ▶ %s", cmd)
				}
			}
			if after > 0 {
				tmp += "\n\tAfter"
				for _, cmd := range l.Hooks.After {
					tmp += colors.Faint.Sprintf("\n\t  ▶ %s", cmd)
				}
			}
			colors.PrintDescription("Hooks", tmp)
		}

		if len(l.Options) > 0 {
			tmp = ""
			for t, options := range l.Options {
				tmp += "\n\t" + t
				for option, values := range options {
					for _, value := range values {
						tmp += colors.Faint.Sprintf("\n\t  ✧ --%s=%s", option, value)
					}
				}
			}
			colors.PrintDescription("Options", tmp)
		}
	}

	// Backends
	for name, b := range c.Backends {
		colors.PrimaryPrint("Backend: \"%s\"", name)
		colors.PrintDescription("Type", b.Type)
		colors.PrintDescription("Path", b.Path)

		if len(b.Env) > 0 {
			tmp := ""
			for option, value := range b.Env {
				tmp += fmt.Sprintf("\n\t%s %s %s", colors.Success.Sprint("✧"), option, colors.Faint.Sprint(value))
			}
			colors.PrintDescription("Env", tmp)
		}
	}
}

func CheckConfig() error {
	c := GetConfig()
	if c == nil {
		return fmt.Errorf("config could not be loaded/found")
	}
	if !CheckIfResticIsCallable() {
		return fmt.Errorf(`restic was not found. Install either with "autorestic install" or manually`)
	}
	for name, backend := range c.Backends {
		backend.name = name
		if err := backend.validate(); err != nil {
			return err
		}
	}
	for name, location := range c.Locations {
		location.name = name
		if err := location.validate(c); err != nil {
			return err
		}
	}
	return nil
}

func GetAllOrSelected(cmd *cobra.Command, backends bool) ([]string, error) {
	var list []string
	if backends {
		for name := range config.Backends {
			list = append(list, name)
		}
	} else {
		for name := range config.Locations {
			list = append(list, name)
		}
	}

	all, _ := cmd.Flags().GetBool("all")
	if all {
		return list, nil
	}

	var selected []string
	if backends {
		selected, _ = cmd.Flags().GetStringSlice("backend")
	} else {
		selected, _ = cmd.Flags().GetStringSlice("location")
	}
	for _, s := range selected {
		found := false
		for _, l := range list {
			if l == s {
				found = true
				break
			}
		}
		if !found {
			if backends {
				return nil, fmt.Errorf("invalid backend \"%s\"", s)
			} else {
				return nil, fmt.Errorf("invalid location \"%s\"", s)
			}
		}
	}

	if len(selected) == 0 {
		return selected, fmt.Errorf("nothing selected, aborting")
	}
	return selected, nil
}

func AddFlagsToCommand(cmd *cobra.Command, backend bool) {
	cmd.PersistentFlags().BoolP("all", "a", false, "Backup all locations")
	if backend {
		cmd.PersistentFlags().StringSliceP("backend", "b", []string{}, "backends")
	} else {
		cmd.PersistentFlags().StringSliceP("location", "l", []string{}, "Locations")
	}
}