// Copyright 2016-2017, Pulumi Corporation.  All rights reserved.

package cmd

import (
	"bufio"
	"flag"
	"fmt"
	"os"

	"github.com/golang/glog"
	"github.com/spf13/cobra"

	"github.com/pulumi/pulumi/pkg/diag/colors"
	"github.com/pulumi/pulumi/pkg/engine"
	"github.com/pulumi/pulumi/pkg/util/cmdutil"
)

var (
	// The lumi engine provides an API for common lumi tasks.  It's shared across the
	// `pulumi` command and the deployment engine in the pulumi-service. For `pulumi` we set
	// the engine to write output and errors to os.Stdout and os.Stderr.
	lumiEngine    engine.Engine
	localProvider localStackProvider
)

func init() {
	lumiEngine = engine.Engine{Targets: localProvider, Snapshots: localProvider}
}

// NewPulumiCmd creates a new Pulumi Cmd instance.
func NewPulumiCmd() *cobra.Command {
	var logFlow bool
	var logToStderr bool
	var verbose int
	var cwd string
	cmd := &cobra.Command{
		Use: "pulumi",
		PersistentPreRun: func(cmd *cobra.Command, args []string) {
			if cwd != "" {
				err := os.Chdir(cwd)
				if err != nil {
					cmdutil.ExitError(err.Error())
				}
			}

			cmdutil.InitLogging(logToStderr, verbose, logFlow)
		},
		PersistentPostRun: func(cmd *cobra.Command, args []string) {
			glog.Flush()
		},
	}

	cmd.PersistentFlags().StringVarP(&cwd, "cwd", "C", "", "Run pulumi as if it had been started in another directory")
	cmd.PersistentFlags().BoolVar(&logFlow, "logflow", false, "Flow log settings to child processes (like plugins)")
	cmd.PersistentFlags().BoolVar(&logToStderr, "logtostderr", false, "Log to stderr instead of to files")
	cmd.PersistentFlags().IntVarP(
		&verbose, "verbose", "v", 0, "Enable verbose logging (e.g., v=3); anything >3 is very verbose")

	cmd.AddCommand(newConfigCmd())
	cmd.AddCommand(newDestroyCmd())
	cmd.AddCommand(newStackCmd())
	cmd.AddCommand(newPreviewCmd())
	cmd.AddCommand(newUpdateCmd())
	cmd.AddCommand(newVersionCmd())

	// Tell flag about -C, so someone can do pulumi -C <working-directory> stack and the call to cmdutil.InitLogging
	// which calls flag.Parse under the hood doesn't yell at you.
	//
	// TODO[pulumi/pulumi#301]: when we move away from using glog, it should be safe to remove this.
	flag.StringVar(&cwd, "C", "", "Run pulumi as if it had been started in another directory")

	return cmd
}

func confirmPrompt(msg string, name string) bool {
	prompt := fmt.Sprintf(msg, name)
	fmt.Print(
		colors.ColorizeText(fmt.Sprintf("%v%v%v\n", colors.SpecAttention, prompt, colors.Reset)))
	fmt.Printf("Please confirm that this is what you'd like to do by typing (\"%v\"): ", name)
	reader := bufio.NewReader(os.Stdin)
	if line, _ := reader.ReadString('\n'); line != name+"\n" {
		fmt.Fprintf(os.Stderr, "Confirmation declined -- exiting without doing anything\n")
		return false
	}
	return true
}