<?php
/**
 * Usuario.php — Modelo de usuarios
 */

declare(strict_types=1);
require_once __DIR__ . '/../config/config.php';

class UsuarioModel {

    private PDO $db;

    public function __construct() {
        $this->db = getDB();
    }

    public function todos(bool $incluirEliminados = false): array {
        $sql = "SELECT u.*, r.nombre AS rol_nombre
                FROM usuarios u
                JOIN roles r ON r.id = u.rol_id
                WHERE u.activo = 1";
        if (!$incluirEliminados) $sql .= " AND u.deleted_at IS NULL";
        $sql .= " ORDER BY u.nombre, u.apellido";
        return $this->db->query($sql)->fetchAll();
    }

    public function buscarPorId(int $id): ?array {
        $stmt = $this->db->prepare(
            "SELECT u.*, r.nombre AS rol_nombre, r.permisos
             FROM usuarios u JOIN roles r ON r.id = u.rol_id
             WHERE u.id = ? AND u.deleted_at IS NULL"
        );
        $stmt->execute([$id]);
        return $stmt->fetch() ?: null;
    }

    public function buscarPorUsername(string $username): ?array {
        $stmt = $this->db->prepare(
            "SELECT u.*, r.nombre AS rol_nombre, r.permisos
             FROM usuarios u JOIN roles r ON r.id = u.rol_id
             WHERE u.username = ? AND u.deleted_at IS NULL"
        );
        $stmt->execute([$username]);
        return $stmt->fetch() ?: null;
    }

    public function buscarPorEmail(string $email): ?array {
        $stmt = $this->db->prepare(
            "SELECT * FROM usuarios WHERE email = ? AND deleted_at IS NULL"
        );
        $stmt->execute([$email]);
        return $stmt->fetch() ?: null;
    }

    public function buscarPorToken(string $token): ?array {
        $stmt = $this->db->prepare(
            "SELECT * FROM usuarios WHERE token_recuperacion = ? AND deleted_at IS NULL"
        );
        $stmt->execute([$token]);
        return $stmt->fetch() ?: null;
    }

    public function crear(array $datos): int {
        $stmt = $this->db->prepare(
            "INSERT INTO usuarios (rol_id, nombre, apellido, email, username, password_hash, cargo, area, supervisor_id)
             VALUES (:rol_id, :nombre, :apellido, :email, :username, :password_hash, :cargo, :area, :supervisor_id)"
        );
        $stmt->execute([
            ':rol_id'        => $datos['rol_id'],
            ':nombre'        => $datos['nombre'],
            ':apellido'      => $datos['apellido'],
            ':email'         => $datos['email'],
            ':username'      => $datos['username'],
            ':password_hash' => password_hash($datos['password'], PASSWORD_BCRYPT, ['cost' => 12]),
            ':cargo'         => $datos['cargo'] ?? null,
            ':area'          => $datos['area'] ?? null,
            ':supervisor_id' => $datos['supervisor_id'] ?? null,
        ]);
        return (int)$this->db->lastInsertId();
    }

    public function actualizar(int $id, array $datos): bool {
        $stmt = $this->db->prepare(
            "UPDATE usuarios SET rol_id=:rol_id, nombre=:nombre, apellido=:apellido,
             email=:email, username=:username, cargo=:cargo, area=:area,
             supervisor_id=:supervisor_id, activo=:activo
             WHERE id=:id"
        );
        return $stmt->execute([
            ':rol_id'       => $datos['rol_id'],
            ':nombre'       => $datos['nombre'],
            ':apellido'     => $datos['apellido'],
            ':email'        => $datos['email'],
            ':username'     => $datos['username'],
            ':cargo'        => $datos['cargo'] ?? null,
            ':area'         => $datos['area'] ?? null,
            ':supervisor_id'=> $datos['supervisor_id'] ?? null,
            ':activo'       => $datos['activo'] ?? 1,
            ':id'           => $id,
        ]);
    }

    public function actualizarPassword(int $id, string $hash): bool {
        $stmt = $this->db->prepare(
            "UPDATE usuarios SET password_hash=?, token_recuperacion=NULL, token_expira=NULL WHERE id=?"
        );
        return $stmt->execute([$hash, $id]);
    }

    public function actualizarUltimoLogin(int $id): void {
        $stmt = $this->db->prepare("UPDATE usuarios SET ultimo_login=NOW() WHERE id=?");
        $stmt->execute([$id]);
    }

    public function guardarTokenRecuperacion(int $id, string $token, string $expira): void {
        $stmt = $this->db->prepare(
            "UPDATE usuarios SET token_recuperacion=?, token_expira=? WHERE id=?"
        );
        $stmt->execute([$token, $expira, $id]);
    }

    public function eliminarLogico(int $id): bool {
        $stmt = $this->db->prepare("UPDATE usuarios SET deleted_at=NOW(), activo=0 WHERE id=?");
        return $stmt->execute([$id]);
    }

    public function restaurar(int $id): bool {
        $stmt = $this->db->prepare("UPDATE usuarios SET deleted_at=NULL, activo=1 WHERE id=?");
        return $stmt->execute([$id]);
    }

    public function emailExiste(string $email, ?int $excepto = null): bool {
        $sql = "SELECT id FROM usuarios WHERE email=? AND deleted_at IS NULL";
        $params = [$email];
        if ($excepto) { $sql .= " AND id != ?"; $params[] = $excepto; }
        return (bool)$this->db->prepare($sql)->execute($params)
               && $this->db->query("SELECT FOUND_ROWS()")->fetchColumn();
    }

    public function roles(): array {
        return $this->db->query("SELECT * FROM roles ORDER BY id")->fetchAll();
    }

    public function usuariosParaSelector(): array {
        return $this->db->query(
            "SELECT id, CONCAT(nombre,' ',apellido) AS nombre_completo, email, area
             FROM usuarios WHERE activo=1 AND deleted_at IS NULL ORDER BY nombre"
        )->fetchAll();
    }
}