package store

import (
	"context"
	"fmt"
	"time"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"

	"git.kundeng.us/phoenix/textsender-models/tx0/user"
)

type UserStore interface {
	CreateUser(ctx context.Context, user *user.User) error
	GetUserByID(ctx context.Context, id uuid.UUID) (*user.User, error)
	GetUserByUsername(ctx context.Context, username string) (*user.User, error)
	GetAllUsers(ctx context.Context) ([]*user.User, error)
	UserExists(ctx context.Context, username string) (bool, error)
	UpdatePassword(ctx context.Context, id uuid.UUID, password string) (int64, error)
	UpdateLastLogin(ctx context.Context, id uuid.UUID, lastLogin time.Time) (int64, error)
}

type PGUserStore struct {
	db *pgxpool.Pool
}

func NewUserStore(db *pgxpool.Pool) *PGUserStore {
	return &PGUserStore{db: db}
}

func (s *PGUserStore) CreateUser(ctx context.Context, user *user.User) error {
	query := `
		INSERT INTO users (phone_number, username, password)
		VALUES ($1, $2, $3)
		RETURNING id, phone_number, username, created
	`

	return s.db.QueryRow(ctx, query, user.PhoneNumber, user.Username, user.Password).Scan(
		&user.Id, &user.PhoneNumber, &user.Username, &user.Created,
	)
}

func (s *PGUserStore) GetUserByID(ctx context.Context, id uuid.UUID) (*user.User, error) {
	query := `SELECT id, username, password, phone_number, created FROM users WHERE id = $1`

	var user user.User
	err := s.db.QueryRow(ctx, query, id).Scan(
		&user.Id, &user.Username, &user.Password, &user.PhoneNumber, &user.Created,
	)

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

	return &user, nil
}

func (s *PGUserStore) GetUserByUsername(ctx context.Context, username string) (*user.User, error) {
	query := `SELECT id, username, password, phone_number, created FROM users WHERE username = $1`

	var user user.User
	err := s.db.QueryRow(ctx, query, username).Scan(
		&user.Id, &user.Username, &user.Password, &user.PhoneNumber, &user.Created,
	)

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

	return &user, nil
}

func (s *PGUserStore) GetAllUsers(ctx context.Context) ([]*user.User, error) {
	query := `SELECT id, username, password, phone_number, created FROM users`

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

	var users []*user.User
	for rows.Next() {
		var user user.User
		if err := rows.Scan(
			&user.Id, &user.Username, &user.Password, &user.PhoneNumber, &user.Created,
		); err != nil {
			return nil, fmt.Errorf("scanning user row: %w", err)
		}
		users = append(users, &user)
	}

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

	return users, nil
}

func (s *PGUserStore) UserExists(ctx context.Context, username string) (bool, error) {
	query := `SELECT EXISTS(SELECT 1 FROM users WHERE username = $1)`

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

	return exists, nil
}

func (s *PGUserStore) UpdatePassword(ctx context.Context, id uuid.UUID, password string) (int64, error) {
	query := `UPDATE users SET password = $1 WHERE id = $2`
	if affected, err := s.db.Exec(ctx, query, password, id); err != nil {
		return 0, err
	} else {
		return affected.RowsAffected(), nil
	}
}

func (s *PGUserStore) UpdateLastLogin(ctx context.Context, id uuid.UUID, lastLogin time.Time) (int64, error) {
	query := `UPDATE users SET last_login = $1 WHERE id = $2`
	if affected, err := s.db.Exec(ctx, query, lastLogin, id); err != nil {
		return 0, err
	} else {
		return affected.RowsAffected(), nil
	}
}