package systemconfig

import (
	"context"
	"encoding/json"
	"strings"

	"hfb_sys/backend/internal/model"
)

func (s *Service) HomeAnnouncements(ctx context.Context) (*HomeAnnouncementsDTO, error) {
	if s.repo == nil {
		return nil, ErrDependencyUnavailable
	}
	items, err := s.homeAnnouncements(ctx)
	if err != nil {
		return nil, err
	}
	return &HomeAnnouncementsDTO{Items: items}, nil
}

func (s *Service) HomeConfig(ctx context.Context, siteCode string) (*HomeConfigDTO, error) {
	if s.repo == nil {
		return nil, ErrDependencyUnavailable
	}
	announcements, err := s.homeAnnouncements(ctx)
	if err != nil {
		return nil, err
	}
	banners, err := s.homeBanners(ctx)
	if err != nil {
		return nil, err
	}
	awRecycle, err := s.awRecycle(ctx)
	if err != nil {
		return nil, err
	}
	cooperationFeedback, err := s.cooperationFeedback(ctx)
	if err != nil {
		return nil, err
	}
	publishOptions, err := s.publishOptions(ctx)
	if err != nil {
		return nil, err
	}
	config := &HomeConfigDTO{
		Announcements:       announcements,
		Banners:             banners,
		PublishOptions:      publishOptions,
		AWRecycle:           awRecycle,
		CooperationFeedback: cooperationFeedback,
	}
	s.applySiteHomeOverrides(ctx, siteCode, config)
	return config, nil
}

// applySiteHomeOverrides 用分站自己的首页入口覆盖主站配置。字段为空表示继续继承主站。
func (s *Service) applySiteHomeOverrides(ctx context.Context, siteCode string, config *HomeConfigDTO) {
	siteCode = strings.TrimSpace(siteCode)
	if s == nil || s.repo == nil || s.repo.db == nil || config == nil || siteCode == "" {
		return
	}
	var site model.DistributionSite
	err := s.repo.db.WithContext(ctx).
		Select("aw_recycle_json", "cooperation_feedback_json").
		Where("site_code = ? AND status = ?", siteCode, "active").
		First(&site).Error
	if err != nil {
		return
	}
	if item, ok := parseAWRecycleOverride(site.AWRecycleJSON); ok {
		config.AWRecycle = item
	}
	if item, ok := parseCooperationFeedbackOverride(site.CooperationFeedbackJSON); ok {
		config.CooperationFeedback = item
	}
}

func parseAWRecycleOverride(raw string) (AWRecycleConfig, bool) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return AWRecycleConfig{}, false
	}
	var item AWRecycleConfig
	if err := json.Unmarshal([]byte(raw), &item); err != nil {
		return AWRecycleConfig{}, false
	}
	return normalizeAWRecycle(item), true
}

func parseCooperationFeedbackOverride(raw string) (CooperationFeedbackConfig, bool) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return CooperationFeedbackConfig{}, false
	}
	var item CooperationFeedbackConfig
	if err := json.Unmarshal([]byte(raw), &item); err != nil {
		return CooperationFeedbackConfig{}, false
	}
	return normalizeCooperationFeedback(item), true
}

func (s *Service) homeAnnouncements(ctx context.Context) ([]string, error) {
	value, err := s.repo.FindValue(ctx, homeAnnouncementsConfigKey)
	if err != nil {
		return nil, err
	}
	items := defaultHomeAnnouncements()
	if err := json.Unmarshal([]byte(value), &items); err != nil {
		items = defaultHomeAnnouncements()
	}
	return normalizeAnnouncements(items), nil
}

func (s *Service) homeBanners(ctx context.Context) ([]HomeBannerItem, error) {
	value, err := s.repo.FindValue(ctx, homeBannersConfigKey)
	if err != nil {
		return nil, err
	}
	items := defaultHomeBanners()
	if err := json.Unmarshal([]byte(value), &items); err != nil {
		items = defaultHomeBanners()
	}
	return normalizeHomeBanners(items), nil
}

func (s *Service) awRecycle(ctx context.Context) (AWRecycleConfig, error) {
	value, err := s.repo.FindValue(ctx, awRecycleConfigKey)
	if err != nil {
		return defaultAWRecycle(), err
	}
	item := defaultAWRecycle()
	if err := json.Unmarshal([]byte(value), &item); err != nil {
		item = defaultAWRecycle()
	}
	return normalizeAWRecycle(item), nil
}

func (s *Service) cooperationFeedback(ctx context.Context) (CooperationFeedbackConfig, error) {
	value, err := s.repo.FindValue(ctx, cooperationFeedbackConfigKey)
	if err != nil {
		return defaultCooperationFeedback(), err
	}
	item := defaultCooperationFeedback()
	if err := json.Unmarshal([]byte(value), &item); err != nil {
		item = defaultCooperationFeedback()
	}
	return normalizeCooperationFeedback(item), nil
}