//go:generate struct-markdown

package cvm

import (
	"fmt"
	"unicode/utf8"

	"github.com/hashicorp/packer/template/interpolate"
)

type TencentCloudImageConfig struct {
	// The name you want to create your customize image,
	// it should be composed of no more than 60 characters, of letters, numbers
	// or minus sign.
	ImageName string `mapstructure:"image_name" required:"true"`
	// Image description.
	ImageDescription string `mapstructure:"image_description" required:"false"`
	// Whether shutdown cvm to create Image. Default value is
	// false.
	Reboot bool `mapstructure:"reboot" required:"false"`
	// Whether to force power off cvm when create image.
	// Default value is false.
	ForcePoweroff bool `mapstructure:"force_poweroff" required:"false"`
	// Whether enable Sysprep during creating windows image.
	Sysprep          bool `mapstructure:"sysprep" required:"false"`
	ImageForceDelete bool `mapstructure:"image_force_delete"`
	// regions that will be copied to after
	// your image created.
	ImageCopyRegions []string `mapstructure:"image_copy_regions" required:"false"`
	// accounts that will be shared to
	// after your image created.
	ImageShareAccounts []string `mapstructure:"image_share_accounts" required:"false"`
	// Do not check region and zone when validate.
	SkipValidation bool `mapstructure:"skip_region_validation" required:"false"`
}

func (cf *TencentCloudImageConfig) Prepare(ctx *interpolate.Context) []error {
	var errs []error

	cf.ForcePoweroff = true
	if cf.ImageName == "" {
		errs = append(errs, fmt.Errorf("image_name must be specified"))
	} else if utf8.RuneCountInString(cf.ImageName) > 60 {
		errs = append(errs, fmt.Errorf("image_name length should not exceed 60 characters"))
	}

	if utf8.RuneCountInString(cf.ImageDescription) > 60 {
		errs = append(errs, fmt.Errorf("image_description length should not exceed 60 characters"))
	}

	if len(cf.ImageCopyRegions) > 0 {
		regionSet := make(map[string]struct{})
		regions := make([]string, 0, len(cf.ImageCopyRegions))

		for _, region := range cf.ImageCopyRegions {
			if _, ok := regionSet[region]; ok {
				continue
			}

			regionSet[region] = struct{}{}

			if !cf.SkipValidation {
				if err := validRegion(region); err != nil {
					errs = append(errs, err)
					continue
				}
			}
			regions = append(regions, region)
		}
		cf.ImageCopyRegions = regions
	}

	if len(errs) > 0 {
		return errs
	}

	return nil
}