package firstrechargereward

import (
	"strconv"
	"strings"
)

const defaultFirstRechargeRewardMinAppVersion = "1.5.0"

func isFirstRechargeRewardAppVersionSupported(appVersion string, minAppVersion string) bool {
	appVersion = strings.TrimSpace(appVersion)
	minAppVersion = strings.TrimSpace(minAppVersion)
	if minAppVersion == "" {
		minAppVersion = defaultFirstRechargeRewardMinAppVersion
	}
	if appVersion == "" {
		return false
	}
	return compareAppVersion(appVersion, minAppVersion) >= 0
}

func compareAppVersion(left, right string) int {
	leftParts := parseAppVersion(left)
	rightParts := parseAppVersion(right)
	maxLen := len(leftParts)
	if len(rightParts) > maxLen {
		maxLen = len(rightParts)
	}
	for i := 0; i < maxLen; i++ {
		var lv, rv int
		if i < len(leftParts) {
			lv = leftParts[i]
		}
		if i < len(rightParts) {
			rv = rightParts[i]
		}
		if lv > rv {
			return 1
		}
		if lv < rv {
			return -1
		}
	}
	return 0
}

func parseAppVersion(version string) []int {
	version = strings.TrimSpace(version)
	if version == "" {
		return []int{0}
	}
	parts := strings.Split(version, ".")
	result := make([]int, 0, len(parts))
	for _, part := range parts {
		part = strings.TrimSpace(part)
		if part == "" {
			result = append(result, 0)
			continue
		}
		digits := strings.Builder{}
		for _, r := range part {
			if r < '0' || r > '9' {
				break
			}
			digits.WriteRune(r)
		}
		if digits.Len() == 0 {
			result = append(result, 0)
			continue
		}
		value, err := strconv.Atoi(digits.String())
		if err != nil {
			result = append(result, 0)
			continue
		}
		result = append(result, value)
	}
	return result
}