package cli

import (
	"context"
	"fmt"
	"os"

	"github.com/spf13/cobra"
	"sigs.k8s.io/controller-runtime/pkg/client"

	"github.com/oam-dev/kubevela/apis/types"
	"github.com/oam-dev/kubevela/pkg/utils/env"
	"github.com/oam-dev/kubevela/pkg/utils/system"
	cmdutil "github.com/oam-dev/kubevela/pkg/utils/util"
)

// NewEnvCommand creates `env` command and its nested children
func NewEnvCommand(c types.Args, ioStream cmdutil.IOStreams) *cobra.Command {
	cmd := &cobra.Command{
		Use:                   "env",
		DisableFlagsInUseLine: true,
		Short:                 "Manage environments",
		Long:                  "Manage environments",
		Annotations: map[string]string{
			types.TagCommandType: types.TypeApp,
		},
	}
	cmd.SetOut(ioStream.Out)
	cmd.AddCommand(NewEnvListCommand(ioStream), NewEnvInitCommand(c, ioStream), NewEnvSetCommand(ioStream), NewEnvDeleteCommand(ioStream))
	return cmd
}

// NewEnvListCommand creates `env list` command for listing all environments
func NewEnvListCommand(ioStream cmdutil.IOStreams) *cobra.Command {
	cmd := &cobra.Command{
		Use:                   "ls",
		Aliases:               []string{"list"},
		DisableFlagsInUseLine: true,
		Short:                 "List environments",
		Long:                  "List all environments",
		Example:               `vela env ls [env-name]`,
		RunE: func(cmd *cobra.Command, args []string) error {
			return ListEnvs(args, ioStream)
		},
		Annotations: map[string]string{
			types.TagCommandType: types.TypeStart,
		},
	}
	cmd.SetOut(ioStream.Out)
	return cmd
}

// NewEnvInitCommand creates `env init` command for initializing environments
func NewEnvInitCommand(c types.Args, ioStreams cmdutil.IOStreams) *cobra.Command {
	var envArgs types.EnvMeta
	ctx := context.Background()
	cmd := &cobra.Command{
		Use:                   "init <envName>",
		DisableFlagsInUseLine: true,
		Short:                 "Create environments",
		Long:                  "Create environment and set the currently using environment",
		Example:               `vela env init test --namespace test --email my@email.com`,
		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
			return c.SetConfig()
		},
		RunE: func(cmd *cobra.Command, args []string) error {
			newClient, err := c.GetClient()
			if err != nil {
				return err
			}

			return CreateOrUpdateEnv(ctx, newClient, &envArgs, args, ioStreams)
		},
		Annotations: map[string]string{
			types.TagCommandType: types.TypeStart,
		},
	}
	cmd.SetOut(ioStreams.Out)
	cmd.Flags().StringVar(&envArgs.Namespace, "namespace", "", "specify K8s namespace for env")
	cmd.Flags().StringVar(&envArgs.Email, "email", "", "specify email for production TLS Certificate notification")
	cmd.Flags().StringVar(&envArgs.Domain, "domain", "", "specify domain your applications")
	return cmd
}

// NewEnvDeleteCommand creates `env delete` command for deleting environments
func NewEnvDeleteCommand(ioStreams cmdutil.IOStreams) *cobra.Command {
	ctx := context.Background()
	cmd := &cobra.Command{
		Use:                   "delete",
		DisableFlagsInUseLine: true,
		Short:                 "Delete environment",
		Long:                  "Delete environment",
		Example:               `vela env delete test`,
		RunE: func(cmd *cobra.Command, args []string) error {
			return DeleteEnv(ctx, args, ioStreams)
		},
		Annotations: map[string]string{
			types.TagCommandType: types.TypeStart,
		},
	}
	cmd.SetOut(ioStreams.Out)
	return cmd
}

// NewEnvSetCommand creates `env set` command for setting current environment
func NewEnvSetCommand(ioStreams cmdutil.IOStreams) *cobra.Command {
	cmd := &cobra.Command{
		Use:                   "set",
		Aliases:               []string{"sw"},
		DisableFlagsInUseLine: true,
		Short:                 "Set an environment",
		Long:                  "Set an environment as the current using one",
		Example:               `vela env set test`,
		RunE: func(cmd *cobra.Command, args []string) error {
			return SetEnv(args, ioStreams)
		},
		Annotations: map[string]string{
			types.TagCommandType: types.TypeStart,
		},
	}
	cmd.SetOut(ioStreams.Out)
	return cmd
}

// ListEnvs shows info of all environments
func ListEnvs(args []string, ioStreams cmdutil.IOStreams) error {
	table := newUITable()
	table.AddRow("NAME", "CURRENT", "NAMESPACE", "EMAIL", "DOMAIN")
	var envName = ""
	if len(args) > 0 {
		envName = args[0]
	}
	envList, err := env.ListEnvs(envName)
	if err != nil {
		return err
	}
	for _, env := range envList {
		table.AddRow(env.Name, env.Current, env.Namespace, env.Email, env.Domain)
	}
	ioStreams.Info(table.String())
	return nil
}

// DeleteEnv deletes an environment
func DeleteEnv(ctx context.Context, args []string, ioStreams cmdutil.IOStreams) error {
	if len(args) < 1 {
		return fmt.Errorf("you must specify environment name for 'vela env delete' command")
	}
	for _, envName := range args {
		msg, err := env.DeleteEnv(envName)
		if err != nil {
			return err
		}
		ioStreams.Info(msg)
	}
	return nil
}

// CreateOrUpdateEnv creates or updates an environment
func CreateOrUpdateEnv(ctx context.Context, c client.Client, envArgs *types.EnvMeta, args []string, ioStreams cmdutil.IOStreams) error {
	if len(args) < 1 {
		return fmt.Errorf("you must specify environment name for 'vela env init' command")
	}
	envName := args[0]
	envArgs.Name = envName
	msg, err := env.CreateOrUpdateEnv(ctx, c, envName, envArgs)
	if err != nil {
		return err
	}
	ioStreams.Info(msg)
	return nil
}

// SetEnv sets current environment
func SetEnv(args []string, ioStreams cmdutil.IOStreams) error {
	if len(args) < 1 {
		return fmt.Errorf("you must specify environment name for vela env command")
	}
	envName := args[0]
	msg, err := env.SetEnv(envName)
	if err != nil {
		return err
	}
	ioStreams.Info(msg)
	return nil
}

// GetEnv gets environment by name or current environment
// if no env exists, then init default environment
func GetEnv(cmd *cobra.Command) (*types.EnvMeta, error) {
	var envName string
	var err error
	if cmd != nil {
		envName = cmd.Flag("env").Value.String()
	}
	if envName != "" {
		return env.GetEnvByName(envName)
	}
	envName, err = env.GetCurrentEnvName()
	if err != nil {
		if !os.IsNotExist(err) {
			return nil, err
		}
		if err = system.InitDefaultEnv(); err != nil {
			return nil, err
		}
		envName = types.DefaultEnvName
	}
	return env.GetEnvByName(envName)
}