package logic

import (
	"context"
	"strings"

	"spark-server/internal/module/client/entity"
	"spark-server/internal/pkg/i18n"
)

func canonicalHealthPackage(pkg string) string {
	return entity.CanonicalHealthPackage(pkg)
}

func normalizePlatform(platform string) string {
	switch strings.ToLower(strings.TrimSpace(platform)) {
	case entity.PlatformIOS, "iphone", "ipad":
		return entity.PlatformIOS
	case entity.PlatformAndroid:
		return entity.PlatformAndroid
	case entity.PlatformWeb:
		return entity.PlatformWeb
	default:
		return ""
	}
}

func filterPlansByPlatform(items []entity.SubscriptionPlan, platform string) []entity.SubscriptionPlan {
	platform = normalizePlatform(platform)
	if platform == "" || len(items) == 0 {
		return items
	}
	exact := make([]entity.SubscriptionPlan, 0, len(items))
	fallback := make([]entity.SubscriptionPlan, 0, len(items))
	for _, p := range items {
		got := normalizePlatform(p.Platform)
		if got == platform {
			exact = append(exact, p)
		} else if got == "" {
			fallback = append(fallback, p)
		}
	}
	if len(exact) > 0 {
		return exact
	}
	return fallback
}

func (s *Service) clientPlans(ctx context.Context, lang, packageName, platform string) ([]entity.SubscriptionPlan, error) {
	plans, err := s.repo.ListPlans(ctx, lang, packageName)
	if err != nil {
		return nil, err
	}
	picked := filterPlansByPlatform(plans, platform)
	if len(picked) > 0 || lang == string(i18n.ZhCN) {
		return picked, nil
	}
	plans, err = s.repo.ListPlans(ctx, string(i18n.ZhCN), packageName)
	if err != nil {
		return nil, err
	}
	return filterPlansByPlatform(plans, platform), nil
}