package repository

import (
	"context"
	"errors"

	dbgen "Yimaru-Backend/gen/db"
	"Yimaru-Backend/internal/domain"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgtype"
)

func mapDBTeamInvitation(row dbgen.TeamInvitation) domain.TeamInvitation {
	inv := domain.TeamInvitation{
		ID:           row.ID,
		TeamMemberID: row.TeamMemberID,
		Token:        row.Token,
		Status:       domain.TeamInvitationStatus(row.Status),
		ExpiresAt:    row.ExpiresAt.Time,
		CreatedAt:    row.CreatedAt.Time,
	}
	if row.InvitedBy.Valid {
		inv.InvitedBy = &row.InvitedBy.Int64
	}
	if row.AcceptedAt.Valid {
		t := row.AcceptedAt.Time
		inv.AcceptedAt = &t
	}
	if row.UpdatedAt.Valid {
		t := row.UpdatedAt.Time
		inv.UpdatedAt = &t
	}
	return inv
}

func (s *Store) CreateTeamInvitation(ctx context.Context, invitation domain.TeamInvitation) (domain.TeamInvitation, error) {
	var invitedBy pgtype.Int8
	if invitation.InvitedBy != nil {
		invitedBy = pgtype.Int8{Int64: *invitation.InvitedBy, Valid: true}
	}

	row, err := s.queries.CreateTeamInvitation(ctx, dbgen.CreateTeamInvitationParams{
		TeamMemberID: invitation.TeamMemberID,
		Token:        invitation.Token,
		ExpiresAt:    pgtype.Timestamptz{Time: invitation.ExpiresAt, Valid: true},
		InvitedBy:    invitedBy,
	})
	if err != nil {
		return domain.TeamInvitation{}, err
	}
	return mapDBTeamInvitation(row), nil
}

func (s *Store) GetTeamInvitationByToken(ctx context.Context, token string) (domain.TeamInvitation, error) {
	row, err := s.queries.GetTeamInvitationByToken(ctx, token)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return domain.TeamInvitation{}, domain.ErrTeamInvitationNotFound
		}
		return domain.TeamInvitation{}, err
	}
	return mapDBTeamInvitation(row), nil
}

func (s *Store) GetTeamInvitationByID(ctx context.Context, id int64) (domain.TeamInvitation, error) {
	row, err := s.queries.GetTeamInvitationByID(ctx, id)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return domain.TeamInvitation{}, domain.ErrTeamInvitationNotFound
		}
		return domain.TeamInvitation{}, err
	}
	return mapDBTeamInvitation(row), nil
}

func (s *Store) GetPendingTeamInvitationByMemberID(ctx context.Context, memberID int64) (domain.TeamInvitation, error) {
	row, err := s.queries.GetPendingTeamInvitationByMemberID(ctx, memberID)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return domain.TeamInvitation{}, domain.ErrTeamInvitationNotFound
		}
		return domain.TeamInvitation{}, err
	}
	return mapDBTeamInvitation(row), nil
}

func (s *Store) RevokePendingTeamInvitationsForMember(ctx context.Context, memberID int64) error {
	return s.queries.RevokePendingTeamInvitationsForMember(ctx, memberID)
}

func (s *Store) AcceptTeamInvitation(ctx context.Context, invitationID int64) (domain.TeamInvitation, error) {
	row, err := s.queries.AcceptTeamInvitation(ctx, invitationID)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return domain.TeamInvitation{}, domain.ErrTeamInvitationNotFound
		}
		return domain.TeamInvitation{}, err
	}
	return mapDBTeamInvitation(row), nil
}

func (s *Store) RevokeTeamInvitation(ctx context.Context, invitationID int64) (domain.TeamInvitation, error) {
	row, err := s.queries.RevokeTeamInvitation(ctx, invitationID)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return domain.TeamInvitation{}, domain.ErrTeamInvitationNotFound
		}
		return domain.TeamInvitation{}, err
	}
	return mapDBTeamInvitation(row), nil
}

func (s *Store) ExpireTeamInvitation(ctx context.Context, invitationID int64) error {
	return s.queries.ExpireTeamInvitation(ctx, invitationID)
}

func (s *Store) ListTeamInvitations(ctx context.Context, status *string, limit, offset int32) ([]domain.TeamInvitationWithMember, int64, error) {
	rows, err := s.queries.ListTeamInvitations(ctx, dbgen.ListTeamInvitationsParams{
		Status: toPgText(status),
		Offset: pgtype.Int4{Int32: offset, Valid: true},
		Limit:  pgtype.Int4{Int32: limit, Valid: true},
	})
	if err != nil {
		return nil, 0, err
	}

	out := make([]domain.TeamInvitationWithMember, 0, len(rows))
	var total int64
	for _, row := range rows {
		inv := mapDBTeamInvitation(dbgen.TeamInvitation{
			ID:           row.ID,
			TeamMemberID: row.TeamMemberID,
			Token:        row.Token,
			Status:       row.Status,
			ExpiresAt:    row.ExpiresAt,
			InvitedBy:    row.InvitedBy,
			AcceptedAt:   row.AcceptedAt,
			CreatedAt:    row.CreatedAt,
			UpdatedAt:    row.UpdatedAt,
		})
		out = append(out, domain.TeamInvitationWithMember{
			TeamInvitation: inv,
			Email:          row.Email,
			FirstName:      row.FirstName,
			LastName:       row.LastName,
			TeamRole:       domain.TeamRole(row.TeamRole),
		})
		total = row.TotalCount
	}
	return out, total, nil
}