package cmd

import (
	"context"
	"os"
	"os/signal"
	"strings"

	"github.com/pterm/pterm"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	"gitlab.sweetwater.com/it/devops/tools/gitlab-project-manager/internal/config"
)

var conf config.Config
var plog *pterm.Logger

var rootCmd = &cobra.Command{
	Use:              "gitlab-project-manager",
	Aliases:          []string{"gpm"},
	Short:            "Find and use GitLab projects locally",
	Long:             rootCmdLong,
	PersistentPreRun: initRootCmd,
}

// Hook traversal is enabled, so this will be run for all
// sub-commands regardless of their registered pre-hooks
func initRootCmd(cmd *cobra.Command, args []string) {
	initProjectPath(cmd, args)
}

// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
	ctx, cncl := signal.NotifyContext(context.Background(), os.Kill, os.Interrupt)
	defer cncl()

	err := rootCmd.ExecuteContext(ctx)

	if err != nil {
		pterm.Error.Printfln(pterm.LightYellow("Command failed, " + err.Error()))
		os.Exit(1)
	}
}

func init() {
	cobra.EnableTraverseRunHooks = true
	cobra.OnInitialize(initConfig)

	// Global flags
	rootCmd.PersistentFlags().String("config", "",
		"config file (default is "+defConfigPath+")")
	rootCmd.PersistentFlags().String("projectPath", "",
		"Sets a path for local clones of projects")
	rootCmd.PersistentFlags().String("logLevel", defLogLevel,
		"Default log level -- info, warn, error, debug")
	rootCmd.PersistentFlags().StringSlice("remote", []string{},
		"Specify remotes by host for any sub-command. Provide multiple times or comma delimited.")

	// Flag autocompletion
	rootCmd.RegisterFlagCompletionFunc("logLevel", validLogLevelsFunc)
	rootCmd.RegisterFlagCompletionFunc("remote", validRemotesFunc)

	viper.BindPFlags(rootCmd.PersistentFlags())
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
	cfgFile := viper.GetString("config")
	if cfgFile != "" {
		// Use config file from the flag.
		viper.SetConfigFile(cfgFile)
	} else {
		// Find home directory.
		home, err := os.UserHomeDir()
		cobra.CheckErr(err)

		// Search config in home directory with name ".gitlab-project-manager" (without extension).
		viper.AddConfigPath(home + "/.config")
		viper.SetConfigType("yaml")
		viper.SetConfigName("gitlab-project-manager")
	}

	viper.AutomaticEnv()
	viper.ReadInConfig()

	// Configure pretty logger
	plog = pterm.DefaultLogger.
		WithLevel(getPtermLogLevel(viper.GetString("logLevel"))).
		WithWriter(os.Stderr)
	if plog.Level == pterm.LogLevelDebug {
		pterm.EnableDebugMessages()
	}

	// Load into struct to not be so darn pythonic, retrieving
	// settings by untyped string "name"
	if err := viper.Unmarshal(&conf); err != nil {
		plog.Error("Failed loading config", plog.Args("err", err))
	}

	if len(os.Args) > 0 && strings.HasPrefix(os.Args[1], "conf") {
		plog.Debug("Permitting missing config for config sub-command")
		return
	} else if conf.ProjectPath == "" {
		plog.Fatal("Minimal configuration missing, must have projectPath", plog.Args(
			"do",
			"Try running `gitlab-project-manager config default > "+defConfigPath,
		))
	}

	checkConfigPerms(viper.ConfigFileUsed()) // Abort on world-readable config

	plog.Debug("Configuration loaded", plog.Args("conf", conf))
}

func getPtermLogLevel(level string) pterm.LogLevel {
	var pLevel pterm.LogLevel
	switch strings.ToLower(level) {
	case "error":
		pLevel = pterm.LogLevelError
	case "warn":
		pLevel = pterm.LogLevelWarn
	case "info":
		pLevel = pterm.LogLevelInfo
	case "debug":
		pLevel = pterm.LogLevelDebug
	default:
		pLevel = pterm.LogLevelInfo
	}
	return pLevel
}

// Don't allow world-readable configuration
func checkConfigPerms(file string) {
	stat, err := os.Stat(file)
	if err != nil {
		plog.Error("Failure reading configuration", plog.Args("err", err))
		return
	}
	if stat.Mode().Perm()&0004 == 0004 {
		plog.Error("Configuration is world-readable. Recomment 0400.",
			plog.Args("mode", stat.Mode().String()))
		os.Exit(1)
	}
}