package batchmetadata

import "github.com/gogf/gf/v2/errors/gerror"

const (
	Console     = "console"
	MiniProgram = "mini_program"
	API         = "api"
	System      = "system"
	Legacy      = "legacy"
	Unknown     = 0
	Single      = 1
	Bulk        = 2
)

// NormalizeMode validates the explicit execution size supplied by the business entry point.
// Execution size is request metadata and must not be inferred from context or result counts.
func NormalizeMode(requested int) int {
	if requested == Single || requested == Bulk {
		return requested
	}
	return Unknown
}

func ValidChannel(value string) bool {
	switch value {
	case Console, MiniProgram, API, System, Legacy:
		return true
	}
	return false
}

func Channel(value string) string {
	if ValidChannel(value) {
		return value
	}
	return Legacy
}

func ValidMode(value int) bool { return value >= Unknown && value <= Bulk }

// ValidateCreation rejects missing attribution for new work; historical reads
// and resumed work continue to use Channel/NormalizeMode for compatibility.
func ValidateCreation(channel string, mode int) error {
	if !ValidChannel(channel) || channel == Legacy {
		return gerror.New("新建批次发起渠道无效")
	}
	if mode != Single && mode != Bulk {
		return gerror.New("新建批次必须指定单卡或批量操作规模")
	}
	return nil
}