package store

import (
	"context"
	"fmt"

	"git.kundeng.us/phoenix/textsender-models/tx0/contact"
	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"
)

type ContactStore interface {
	CreateContact(ctx context.Context, con *contact.Contact) error
	GetContactByID(ctx context.Context, id uuid.UUID) (*contact.Contact, error)
	GetContactByPhone(ctx context.Context, phone string, userId uuid.UUID) (*contact.Contact, error)
	GetAllContacts(ctx context.Context) ([]*contact.Contact, error)
	ContactExists(ctx context.Context, phone string, userId uuid.UUID) (bool, error)
	UpdateNames(ctx context.Context, con *contact.Contact, firstname *string, lastname *string, nickname *string) (int64, error)
}

type PGContactStore struct {
	db *pgxpool.Pool
}

func NewContactStore(db *pgxpool.Pool) *PGContactStore {
	return &PGContactStore{db: db}
}

func (s *PGContactStore) CreateContact(ctx context.Context, con *contact.Contact) error {
	query := `
		INSERT INTO contacts (phone_number, user_id, first_name, last_name, nickname)
		VALUES ($1, $2, $3, $4, $5)
		RETURNING id, phone_number, user_id
	`

	return s.db.QueryRow(ctx, query, con.PhoneNumber, con.UserId, con.Firstname, con.Lastname, con.Nickname).Scan(
		&con.Id, &con.PhoneNumber, &con.UserId,
	)
}

func (s *PGContactStore) GetContactByID(ctx context.Context, id uuid.UUID) (*contact.Contact, error) {
	query := `SELECT id, phone_number, user_id, first_name, last_name, nickname FROM contacts WHERE id = $1`

	var con contact.Contact
	err := s.db.QueryRow(ctx, query, id).Scan(
		&con.Id, &con.PhoneNumber, &con.UserId, &con.Firstname, &con.Lastname, &con.Nickname,
	)

	if err == pgx.ErrNoRows {
		return nil, nil
	} else if err != nil {
		return nil, fmt.Errorf("getting contact by ID: %w", err)
	} else {
		return &con, nil
	}
}

func (s *PGContactStore) GetContactByPhone(ctx context.Context, phone string, userId uuid.UUID) (*contact.Contact, error) {
	query := `SELECT id, phone_number, user_id, first_name, last_name, nickname FROM contacts WHERE phone_number = $1 AND user_id = $2`

	var con contact.Contact
	err := s.db.QueryRow(ctx, query, phone, userId).Scan(
		&con.Id, &con.PhoneNumber, &con.UserId, &con.Firstname, &con.Lastname, &con.Nickname,
	)

	if err == pgx.ErrNoRows {
		return nil, nil
	} else if err != nil {
		return nil, fmt.Errorf("getting contact by phone and User ID: %w", err)
	} else {
		return &con, nil
	}
}

func (s *PGContactStore) GetAllContacts(ctx context.Context) ([]*contact.Contact, error) {
	query := `SELECT id, phone_number, user_id, first_name, last_name, nickname FROM contacts`

	rows, err := s.db.Query(ctx, query)
	if err != nil {
		return nil, fmt.Errorf("querying all contacts: %w", err)
	}
	defer rows.Close()

	var cons []*contact.Contact
	for rows.Next() {
		var con contact.Contact
		if err := rows.Scan(
			&con.Id, &con.PhoneNumber, &con.UserId, &con.Firstname, &con.Lastname, &con.Nickname,
		); err != nil {
			return nil, fmt.Errorf("scanning contact row: %w", err)
		}
		cons = append(cons, &con)
	}

	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("iterating contact rows: %w", err)
	}

	return cons, nil
}

func (s *PGContactStore) ContactExists(ctx context.Context, phone string, userId uuid.UUID) (bool, error) {
	query := `SELECT EXISTS(SELECT 1 FROM contacts WHERE phone_number = $1 AND user_id = $2)`

	var exists bool
	err := s.db.QueryRow(ctx, query, phone, userId).Scan(&exists)
	if err != nil {
		return false, fmt.Errorf("checking if contact exists: %w", err)
	}

	return exists, nil
}

func (s *PGContactStore) UpdateNames(ctx context.Context, con *contact.Contact, firstname *string, lastname *string, nickname *string) (int64, error) {
	if firstname == nil && lastname == nil && nickname == nil {
		return 0, fmt.Errorf("Names are nil")
	} else {
		if firstname != nil && lastname != nil && nickname != nil {
			query := "UPDATE contacts SET first_name = $1, last_name = $2, nickname = $3 WHERE id = $4"
			if affected, err := s.db.Exec(ctx, query, firstname, lastname, nickname, con.Id); err != nil {
				return 0, err
			} else {
				con.Firstname = firstname
				con.Lastname = lastname
				con.Nickname = nickname
				return affected.RowsAffected(), nil
			}
		} else if firstname != nil && lastname != nil {
			query := "UPDATE contacts SET first_name = $1, last_name = $2 WHERE id = $3"
			if affected, err := s.db.Exec(ctx, query, firstname, lastname, con.Id); err != nil {
				return 0, err
			} else {
				con.Firstname = firstname
				con.Lastname = lastname
				return affected.RowsAffected(), nil
			}
		} else if lastname != nil && nickname != nil {
			query := "UPDATE contacts SET last_name = $1, nickname = $2 WHERE id = $3"
			if affected, err := s.db.Exec(ctx, query, lastname, nickname, con.Id); err != nil {
				return 0, err
			} else {
				con.Lastname = lastname
				con.Nickname = nickname
				return affected.RowsAffected(), nil
			}
		} else if nickname != nil && firstname != nil {
			query := "UPDATE contacts SET nickname = $1, firstname = $2 WHERE id = $3"
			if affected, err := s.db.Exec(ctx, query, nickname, firstname, con.Id); err != nil {
				return 0, err
			} else {
				con.Firstname = firstname
				con.Nickname = nickname
				return affected.RowsAffected(), nil
			}
		} else if firstname != nil {
			query := "UPDATE contacts SET firstname = $1 WHERE id = $2"
			if affected, err := s.db.Exec(ctx, query, firstname, con.Id); err != nil {
				return 0, err
			} else {
				con.Firstname = firstname
				return affected.RowsAffected(), nil
			}
		} else if lastname != nil {
			query := "UPDATE contacts SET lastname = $1 WHERE id = $2"
			if affected, err := s.db.Exec(ctx, query, lastname, con.Id); err != nil {
				return 0, err
			} else {
				con.Lastname = lastname
				return affected.RowsAffected(), nil
			}
		} else {
			query := "UPDATE contacts SET nickname = $1 WHERE id = $2"
			if affected, err := s.db.Exec(ctx, query, nickname, con.Id); err != nil {
				return 0, err
			} else {
				con.Nickname = nickname
				return affected.RowsAffected(), nil
			}
		}
	}
}