package listing

import (
	"context"
	"errors"
	"strings"
)

var (
	ErrDependencyUnavailable = errors.New("dependency unavailable")
	ErrInvalidInput          = errors.New("invalid listing input")
	ErrListingLocked         = errors.New("listing locked")
	ErrMissingTitle          = errors.New("missing listing title")
	ErrMissingServerRegion   = errors.New("missing server region")
	ErrInvalidPrice          = errors.New("invalid listing price")
	ErrInvalidDeposit        = errors.New("invalid listing deposit")
	ErrDepositTooLow         = errors.New("listing deposit too low")
	ErrInvalidHafCoin        = errors.New("invalid haf coin amount")
	ErrMissingScreenshot     = errors.New("missing screenshot")
	ErrMissingOnlineTime     = errors.New("missing online time")
	ErrInvalidOnlineTime     = errors.New("invalid online time")
	ErrAgreementRequired     = errors.New("listing publish agreement required")
	ErrMissingUploaderName   = errors.New("missing uploader name")
	ErrMissingUploadData     = errors.New("missing upload data")
	ErrUploaderNotFound      = errors.New("uploader not found")
	ErrUploaderAmbiguous     = errors.New("uploader ambiguous")
	ErrTooManyUploadItems    = errors.New("too many upload items")
)

type Service struct {
	repo   *Repository
	config ConfigReader
}

type ConfigReader interface {
	FindValue(ctx context.Context, key string) (string, error)
}

const (
	reviewRequiredConfigKey = "listing.review_required"
	publishOptionsConfigKey = "listing.publish_options"
	defaultFireLevelMin     = 38
	maxExternalUploadItems  = 10
	defaultUploadScreenshot = "/api/listings/default-upload-screenshot"
)

type FireLevelTooLowError struct {
	Min int
}

func (e FireLevelTooLowError) Error() string {
	return "fire level too low"
}

type UploadValidationError struct {
	Missing []string
	Invalid []string
}

func (e UploadValidationError) Error() string {
	parts := make([]string, 0, 2)
	if len(e.Missing) > 0 {
		parts = append(parts, "缺少必填字段："+strings.Join(e.Missing, "、"))
	}
	if len(e.Invalid) > 0 {
		parts = append(parts, "字段格式不正确："+strings.Join(e.Invalid, "、"))
	}
	return strings.Join(parts, "；")
}

func NewService(repo *Repository, config ConfigReader) *Service {
	return &Service{repo: repo, config: config}
}