package ru.charm.back.dao;

import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import ru.charm.back.model.Gender;
import ru.charm.back.model.Profile;
import ru.charm.back.model.Role;
import ru.charm.back.model.Status;

import java.sql.*;
import java.sql.Date;
import java.util.*;

@Slf4j
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class ProfileDao {

    private static final ProfileDao INSTANCE = new ProfileDao();
    public static final String URL = "jdbc:postgresql://localhost:5434/charm_repository";
    public static final String USER = "postgres";
    public static final String PASSWORD = "123456";


    @SneakyThrows
    public static ProfileDao getInstance() {
        Class.forName("org.postgresql.Driver");
        return INSTANCE;
    }

    public Profile save(Profile profile) {
        try (
                Connection connection = DriverManager.getConnection(URL, USER, PASSWORD);
                Statement statement = connection.createStatement();
        ) {
            String sql = "INSERT INTO profile(email, password) VALUES ('%s', '%s')".formatted(profile.getEmail(), profile.getPassword());
            int insertCount = statement.executeUpdate(sql, Statement.RETURN_GENERATED_KEYS);
            ResultSet res = statement.getGeneratedKeys();

            if (res.next()) {
                profile.setId(res.getLong("id"));
            }

            return profile;

        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public Optional<Profile> findById(Long id) {
        try (
                Connection connection = DriverManager.getConnection(URL, USER, PASSWORD);
                Statement statement = connection.createStatement();
        ) {
            String sql = "SELECT * FROM profile WHERE id = %s".formatted(id);
            ResultSet res = statement.executeQuery(sql);

            Profile profile = null;
            if (res.next()) {
                profile = mapToProfile(res);
            }

            return Optional.ofNullable(profile);
            
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public List<Profile> findAll() {
        try (
                Connection connection = DriverManager.getConnection(URL, USER, PASSWORD);
                Statement statement = connection.createStatement();
        ) {
            String sql = "SELECT * FROM profile" ;
            ResultSet res = statement.executeQuery(sql);

            List<Profile> profiles = new ArrayList<>();
            while (res.next()) {
                profiles.add(mapToProfile(res));
            }

            return profiles;

        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public Optional<Profile> findByEmailAndPassword(String email, String password) {
        try (Connection conn = DriverManager.getConnection(URL, USER, PASSWORD);
             Statement stmt = conn.createStatement()) {
            //language=POSTGRES-PSQL
            String sql = "SELECT * FROM profile WHERE email = '%s' AND password = '%s'";

            ResultSet rs = stmt.executeQuery(String.format(sql, email, password));

            Profile profile = null;
            if (rs.next()) {
                profile = mapToProfile(rs);
            }
            return Optional.ofNullable(profile);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public void update(Profile profile) {
        try (Connection conn = DriverManager.getConnection(URL, USER, PASSWORD);
             Statement stmt = conn.createStatement()) {
            List<Object> args = new ArrayList<>();
            StringBuilder queryBuilder = new StringBuilder("UPDATE profile SET email = '%s', password = '%s'");
            args.add(profile.getEmail());
            args.add(profile.getPassword());

            if (profile.getName() != null) {
                queryBuilder.append(", name = '%s'");
                args.add(profile.getName());
            }
            if (profile.getSurname() != null) {
                queryBuilder.append(", surname = '%s'");
                args.add(profile.getSurname());
            }
            if (profile.getBirthDate() != null) {
                queryBuilder.append(", birth_date = '%s'");
                args.add(Date.valueOf(profile.getBirthDate()));
            }
            if (profile.getAbout() != null) {
                queryBuilder.append(", about = '%s'");
                args.add(profile.getAbout());
            }
            if (profile.getGender() != null) {
                queryBuilder.append(", gender = '%s'");
                args.add(profile.getGender());
            }
            if (profile.getStatus() != null) {
                queryBuilder.append(", status = '%s'");
                args.add(profile.getStatus());
            }
            if (profile.getPhoto() != null) {
                queryBuilder.append(", photo = '%s'");
                args.add(profile.getPhoto());
            }

            queryBuilder.append(" WHERE id = %s");
            args.add(profile.getId());

            String sql = queryBuilder.toString().formatted(args.toArray());
            log.debug("Final update sql: {}", sql);

            int updateCount = stmt.executeUpdate(sql);
            log.debug("Update count: {}", updateCount);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public boolean delete(Long id) {
        try (Connection conn = DriverManager.getConnection(URL, USER, PASSWORD);
             Statement stmt = conn.createStatement()) {
            //language=POSTGRES-PSQL
            String sql = "DELETE FROM profile WHERE id = %s".formatted(id);

            int deleteCount = stmt.executeUpdate(sql);
            log.debug("Delete count: {}", deleteCount);
            return deleteCount > 0;
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public Set<String> getAllEmails() {
        try (
                Connection connection = DriverManager.getConnection(URL, USER, PASSWORD);
                Statement statement = connection.createStatement();
        ) {
            String sql = "SELECT email FROM profile" ;
            ResultSet res = statement.executeQuery(sql);

            ArrayList<String> emails = new ArrayList<>();
            while (res.next()) {
                emails.add(res.getString("email"));
            }

            return new HashSet<>(emails);

        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public Optional<Profile> findByEmail(String email) {
        try (
                Connection connection = DriverManager.getConnection(URL, USER, PASSWORD);
                Statement statement = connection.createStatement();
        ) {
            String sql = "SELECT * FROM profile WHERE email = '%s'".formatted(email);
            ResultSet res = statement.executeQuery(sql);

            Profile profile = null;
            if (res.next()) {
                profile = mapToProfile(res);
            }

            return Optional.ofNullable(profile);

        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public Boolean existsByEmail(String email) {
        try (
                Connection connection = DriverManager.getConnection(URL, USER, PASSWORD);
                Statement statement = connection.createStatement();
        ) {
            String sql = "SELECT * FROM profile WHERE email = '%s'".formatted(email);
            ResultSet res = statement.executeQuery(sql);

            return res.next();

        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    private Profile mapToProfile(ResultSet rs) throws SQLException {
        Profile result = new Profile();
        result.setId(rs.getLong("id"));
        result.setEmail(rs.getString("email"));
        result.setPassword(rs.getString("password"));
        result.setName(rs.getString("name"));
        result.setSurname(rs.getString("surname"));
        Date birthDate = rs.getDate("birth_date");
        if (birthDate != null) {
            result.setBirthDate(birthDate.toLocalDate());
        }
        result.setAbout(rs.getString("about"));
        String gender = rs.getString("gender");
        if (gender != null) {
            result.setGender(Gender.valueOf(gender));
        }
        result.setPhoto(rs.getString("photo"));
        String status = rs.getString("status");
        if (status != null) {
            result.setStatus(Status.valueOf(status));
        }
        String role = rs.getString("role");
        if (role != null) {
            result.setRole(Role.valueOf(role));
        }
        return result;

    }
}