// Package repository
package repository

import (
	"context"
	"fmt"
	"time"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"
	"gogs.fxtmmsk.ru/foxtime/photoplaces/backend/internal/models"
)

type UserRepo struct {
	pool *pgxpool.Pool
}

func NewUserRepo(pool *pgxpool.Pool) *UserRepo {
	return &UserRepo{pool: pool}
}

func (r *UserRepo) Create(ctx context.Context, u *models.User) error {
	return r.pool.QueryRow(ctx,
		`INSERT INTO users (email, password_hash, role, name)
		 VALUES ($1, $2, $3, $4)
		 RETURNING id, created_at, updated_at`,
		u.Email, u.PasswordHash, u.Role, u.Name,
	).Scan(&u.ID, &u.CreatedAt, &u.UpdatedAt)
}

func (r *UserRepo) GetByID(ctx context.Context, id string) (*models.User, error) {
	row := r.pool.QueryRow(ctx,
		`SELECT id, email, password_hash, role, status, name, avatar_url, phone, bio, country,
		        created_at, updated_at, deleted_at
		 FROM users WHERE id = $1 AND deleted_at IS NULL`, id)
	return scanUser(row)
}

func (r *UserRepo) GetByEmail(ctx context.Context, email string) (*models.User, error) {
	row := r.pool.QueryRow(ctx,
		`SELECT id, email, password_hash, role, status, name, avatar_url, phone, bio, country,
		        created_at, updated_at, deleted_at
		 FROM users WHERE email = $1 AND deleted_at IS NULL`, email)
	return scanUser(row)
}

func (r *UserRepo) Update(ctx context.Context, u *models.User) error {
	u.UpdatedAt = time.Now()
	_, err := r.pool.Exec(ctx,
		`UPDATE users SET name=$1, phone=$2, bio=$3, avatar_url=$4, country=$5, updated_at=$6
		 WHERE id=$7 AND deleted_at IS NULL`,
		u.Name, u.Phone, u.Bio, u.AvatarURL, u.Country, u.UpdatedAt, u.ID)
	return err
}

func (r *UserRepo) UpdateRole(ctx context.Context, id, role string) error {
	_, err := r.pool.Exec(ctx,
		`UPDATE users SET role=$1, updated_at=now() WHERE id=$2 AND deleted_at IS NULL`, role, id)
	return err
}

func (r *UserRepo) UpdateStatus(ctx context.Context, id, status string) error {
	_, err := r.pool.Exec(ctx,
		`UPDATE users SET status=$1, updated_at=now() WHERE id=$2 AND deleted_at IS NULL`, status, id)
	return err
}

func (r *UserRepo) List(ctx context.Context, filter models.UserFilter) ([]*models.User, error) {
	query := `SELECT id, email, password_hash, role, status, name, avatar_url, phone, bio, country,
	                  created_at, updated_at, deleted_at
	           FROM users WHERE deleted_at IS NULL`
	args := pgx.NamedArgs{}

	if filter.Role != "" {
		query += ` AND role = @role`
		args["role"] = filter.Role
	}
	if filter.Status != "" {
		query += ` AND status = @status`
		args["status"] = filter.Status
	}

	query += ` ORDER BY created_at DESC LIMIT @lim`
	args["lim"] = filter.Limit()

	rows, err := r.pool.Query(ctx, query, args)
	if err != nil {
		return nil, fmt.Errorf("list users: %w", err)
	}
	defer rows.Close()

	var users []*models.User
	for rows.Next() {
		u, err := scanUser(rows)
		if err != nil {
			return nil, err
		}
		users = append(users, u)
	}
	return users, nil
}

func scanUser(row interface{ Scan(dest ...any) error }) (*models.User, error) {
	var u models.User
	err := row.Scan(
		&u.ID, &u.Email, &u.PasswordHash, &u.Role, &u.Status,
		&u.Name, &u.AvatarURL, &u.Phone, &u.Bio, &u.Country,
		&u.CreatedAt, &u.UpdatedAt, &u.DeletedAt,
	)
	if err != nil {
		if err == pgx.ErrNoRows {
			return nil, nil
		}
		return nil, err
	}
	return &u, nil
}