package logic

import (
	"context"
	"strings"
	"time"

	"spark-server/internal/module/moment/entity"
	"spark-server/internal/pkg/errs"
	"spark-server/internal/pkg/i18n"
	"spark-server/internal/pkg/reqctx"
	"spark-server/internal/pkg/validate"
)

type SettingsView struct {
	CoverKey    string             `json:"cover_key"`
	VisibleDays entity.VisibleDays `json:"visible_days"`
	Hides       []*HideView        `json:"hides"`
}

type HideView struct {
	User    UserCard `json:"user"`
	HideHim bool     `json:"hide_him"`
	HideMe  bool     `json:"hide_me"`
}

type PatchSettingsInput struct {
	CoverKey    *string             `json:"cover_key" validate:"omitempty,max=512" label:"field.moment_cover"`
	VisibleDays *entity.VisibleDays `json:"visible_days" validate:"omitempty,oneof=0 3 30 180" label:"field.moment_visible_days" errmsg:"oneof:validate.moment.visible_days_invalid"`
}

type HideInput struct {
	HideHim bool `json:"hide_him"`
	HideMe  bool `json:"hide_me"`
}

func (s *Service) GetSettings(ctx context.Context, userID int64) (*SettingsView, error) {
	if !s.ready() || userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	st, err := s.repo.GetSettings(ctx, userID)
	if err != nil {
		return nil, err
	}
	hides, err := s.repo.ListHides(ctx, userID)
	if err != nil {
		return nil, err
	}
	uids := make([]int64, 0, len(hides))
	for _, h := range hides {
		uids = append(uids, h.PeerID)
	}
	users := s.loadUsers(ctx, uids)
	remarks := s.loadRemarks(ctx, userID, uids)
	items := make([]*HideView, 0, len(hides))
	for _, h := range hides {
		items = append(items, &HideView{User: cardOf(users[h.PeerID], remarks[h.PeerID]), HideHim: h.HideHim, HideMe: h.HideMe})
	}
	return &SettingsView{CoverKey: st.CoverKey, VisibleDays: st.VisibleDays, Hides: items}, nil
}

func (s *Service) PatchSettings(ctx context.Context, userID int64, in *PatchSettingsInput) (*SettingsView, error) {
	if !s.ready() || userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	if in == nil {
		return nil, errs.ErrInvalidArgument
	}
	if err := validate.StructLang(reqctx.Lang(ctx), in); err != nil {
		return nil, err
	}
	st, err := s.repo.GetSettings(ctx, userID)
	if err != nil {
		return nil, err
	}
	if in.VisibleDays != nil {
		if !in.VisibleDays.Valid() {
			return nil, errs.ErrInvalidArgument.WithMsg(i18n.T(reqctx.Lang(ctx), i18n.KeyMomentVisibleDaysInvalid, nil))
		}
		st.VisibleDays = *in.VisibleDays
	}
	if in.CoverKey != nil {
		if err := s.setCover(ctx, st, strings.TrimSpace(*in.CoverKey)); err != nil {
			return nil, err
		}
	}
	st.UserID = userID
	st.UpdatedAtMS = time.Now().UnixMilli()
	if err := s.repo.UpsertSettings(ctx, st); err != nil {
		return nil, err
	}
	return s.GetSettings(ctx, userID)
}

func (s *Service) setCover(ctx context.Context, st *entity.Settings, key string) error {
	if key != "" && !entity.ValidCoverKey(key) {
		return errs.ErrInvalidArgument.WithMsg(i18n.T(reqctx.Lang(ctx), i18n.KeyMomentCoverInvalid, nil))
	}
	old := st.CoverKey
	st.CoverKey = key
	if s.objects != nil && old != "" && old != key {
		_ = s.objects.Delete(ctx, old)
	}
	return nil
}

func (s *Service) PutHide(ctx context.Context, userID, peerID int64, in *HideInput) (*SettingsView, error) {
	if !s.ready() || userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	if peerID <= 0 || peerID == userID {
		return nil, errs.ErrInvalidArgument
	}
	ok, err := s.friends.AreFriends(ctx, userID, peerID)
	if err != nil {
		return nil, err
	}
	if !ok {
		return nil, errs.ErrInvalidArgument.WithMsg(i18n.T(reqctx.Lang(ctx), i18n.KeyMomentHideNotFriend, nil))
	}
	if in == nil {
		in = &HideInput{}
	}
	if err := s.repo.UpsertHide(ctx, &entity.Hide{UserID: userID, PeerID: peerID, HideHim: in.HideHim, HideMe: in.HideMe}); err != nil {
		return nil, err
	}
	return s.GetSettings(ctx, userID)
}

func (s *Service) DeleteHide(ctx context.Context, userID, peerID int64) (*SettingsView, error) {
	if !s.ready() || userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	if peerID <= 0 {
		return nil, errs.ErrInvalidArgument
	}
	if err := s.repo.DeleteHide(ctx, userID, peerID); err != nil {
		return nil, err
	}
	return s.GetSettings(ctx, userID)
}