package family

import (
	"context"
	"errors"
	"fmt"
	"github.com/ente-io/museum/pkg/controller/usercache"
	"github.com/ente-io/museum/pkg/utils/time"

	"github.com/ente-io/museum/ente"
	"github.com/ente-io/museum/pkg/controller"
	"github.com/ente-io/museum/pkg/repo"
	"github.com/sirupsen/logrus"

	"github.com/ente-io/stacktrace"
)

const (
	// maxFamilyMemberLimit number of folks who can be part of a family
	maxFamilyMemberLimit = 6
)

// Controller exposes functions to interact with family module
type Controller struct {
	BillingCtrl   *controller.BillingController
	UserRepo      *repo.UserRepository
	FamilyRepo    *repo.FamilyRepository
	UserCacheCtrl *usercache.Controller
}

// FetchMembers return list of members who are part of a family plan
func (c *Controller) FetchMembers(ctx context.Context, userID int64) (ente.FamilyMemberResponse, error) {
	user, err := c.UserRepo.Get(userID)
	if err != nil {
		return ente.FamilyMemberResponse{}, stacktrace.Propagate(err, "")
	}
	if user.FamilyAdminID == nil {
		return ente.FamilyMemberResponse{}, stacktrace.Propagate(ente.ErrBadRequest, "user is not part of any family plan")
	}
	return c.FetchMembersForAdminID(ctx, *user.FamilyAdminID)
}

func (c *Controller) FetchMembersForAdminID(ctx context.Context, familyAdminID int64) (ente.FamilyMemberResponse, error) {
	familyMembers, err := c.FamilyRepo.GetMembersWithStatus(familyAdminID, repo.ActiveOrInvitedFamilyMemberStatus)
	if err != nil {
		return ente.FamilyMemberResponse{}, stacktrace.Propagate(err, "")
	}
	memberUserIDs := make([]int64, 0)
	for _, familyMember := range familyMembers {
		memberUserIDs = append(memberUserIDs, familyMember.MemberUserID)
	}
	if len(memberUserIDs) == 0 {
		return ente.FamilyMemberResponse{}, stacktrace.Propagate(errors.New("member could can not be zero"), "")
	}

	usersUsageWithSubData, err := c.UserRepo.GetUserUsageWithSubData(ctx, memberUserIDs)
	if err != nil {
		return ente.FamilyMemberResponse{}, err
	}
	var adminSubStorage, adminSubExpiryTime int64
	for i := 0; i < len(familyMembers); i++ {
		member := &familyMembers[i]
		for _, userUsageData := range usersUsageWithSubData {
			if member.MemberUserID == userUsageData.UserID {
				member.Email = *userUsageData.Email
				// return usage only if the member is part of family group
				if member.Status == ente.ACCEPTED || member.Status == ente.SELF {
					member.Usage = userUsageData.StorageConsumed
				}
				if member.IsAdmin {
					adminSubStorage = userUsageData.Storage
					adminSubExpiryTime = userUsageData.ExpiryTime
				}
			}
		}
	}
	bonus, err := c.UserCacheCtrl.GetActiveStorageBonus(ctx, familyAdminID)
	if err != nil {
		return ente.FamilyMemberResponse{}, err
	}
	adminUsableBonus := int64(0)
	if adminSubExpiryTime < time.Microseconds() {
		adminUsableBonus = bonus.GetUsableBonus(0)
	} else {
		adminUsableBonus = bonus.GetUsableBonus(adminSubExpiryTime)
	}

	return ente.FamilyMemberResponse{
		Members:    familyMembers,
		Storage:    adminSubStorage, // family plan storage
		ExpiryTime: adminSubExpiryTime,
		AdminBonus: adminUsableBonus,
	}, nil
}

func (c *Controller) HandleAccountDeletion(ctx context.Context, userID int64, logger *logrus.Entry) error {
	user, err := c.UserRepo.Get(userID)
	if err != nil {
		return stacktrace.Propagate(err, "")
	}
	if user.FamilyAdminID == nil {
		logger.Info("not part of any family, declining any pending invite")
		err = c.FamilyRepo.DeclineAnyPendingInvite(ctx, userID)
		if err != nil {
			return stacktrace.Propagate(err, "")
		}
	} else if *user.FamilyAdminID != userID {
		logger.Info("user is part of family as member/child, leaving family")
		err = c.LeaveFamily(ctx, userID)
		if err != nil {
			return stacktrace.Propagate(err, "")
		}
	} else {
		logger.Info("user is a family admin, revoking invites & removing members")
		members, err := c.FetchMembersForAdminID(ctx, userID)
		if err != nil {
			return stacktrace.Propagate(err, "")
		}

		for _, member := range members.Members {
			if member.IsAdmin {
				continue
			} else if member.Status == ente.ACCEPTED {
				logger.Info(fmt.Sprintf("removing memeber_id %d", member.MemberUserID))
				err = c.RemoveMember(ctx, userID, member.ID)
				if err != nil {
					return stacktrace.Propagate(err, "")
				}
			} else if member.Status == ente.INVITED {
				logger.Info(fmt.Sprintf("revoking invite member_id %d", member.MemberUserID))
				err = c.RevokeInvite(ctx, userID, member.ID)
				if err != nil {
					return stacktrace.Propagate(err, "")
				}
			} else {
				logger.WithField("member", member).Error("unxpected state during account deletion")
			}
		}
	}
	return nil
}