/*
 * Copyright (C) 2018 Richard Hughes <richard@hughsie.com>
 *
 * SPDX-License-Identifier: LGPL-2.1+
 */

#include "config.h"

#include <fwupdplugin.h>

#include <string.h>

#include "fu-uefi-cod-device.h"
#include "fu-uefi-common.h"

struct _FuUefiCodDevice {
	FuUefiDevice parent_instance;
};

G_DEFINE_TYPE(FuUefiCodDevice, fu_uefi_cod_device, FU_TYPE_UEFI_DEVICE)

static gboolean
fu_uefi_cod_device_get_results_for_idx(FuDevice *device, guint idx, GError **error)
{
	FuUefiDevice *device_uefi = FU_UEFI_DEVICE(device);
	fwupd_guid_t guid = {0x0};
	gsize bufsz = 0;
	guint32 status = 0;
	guint32 total_size = 0;
	g_autofree gchar *guidstr = NULL;
	g_autofree gchar *name = NULL;
	g_autofree guint8 *buf = NULL;

	/* read out result */
	name = g_strdup_printf("Capsule%04u", idx);
	if (!fu_efivar_get_data(FU_EFIVAR_GUID_EFI_CAPSULE_REPORT,
				name,
				&buf,
				&bufsz,
				NULL,
				error)) {
		g_prefix_error(error, "failed to read %s: ", name);
		return FALSE;
	}

	/* sanity check */
	if (!fu_common_read_uint32_safe(buf, bufsz, 0x00, &total_size, G_LITTLE_ENDIAN, error))
		return FALSE;
	if (total_size < 0x3A) {
		g_set_error_literal(error,
				    FWUPD_ERROR,
				    FWUPD_ERROR_INTERNAL,
				    "EFI_CAPSULE_RESULT_VARIABLE_HEADER too small");
		return FALSE;
	}

	/* verify guid */
	if (!fu_memcpy_safe(guid,
			    sizeof(guid),
			    0x0, /* dst */
			    buf,
			    bufsz,
			    0x08, /* src */
			    sizeof(guid),
			    error))
		return FALSE;
	guidstr = fwupd_guid_to_string(&guid, FWUPD_GUID_FLAG_MIXED_ENDIAN);
	if (g_strcmp0(guidstr, fu_uefi_device_get_guid(device_uefi)) != 0) {
		g_set_error(error,
			    FWUPD_ERROR,
			    FWUPD_ERROR_NOT_FOUND,
			    "wrong GUID, expected %s, got %s",
			    fu_uefi_device_get_guid(device_uefi),
			    guidstr);
		return FALSE;
	}

	/* get status */
	if (!fu_common_read_uint32_safe(buf, bufsz, 0x28, &status, G_LITTLE_ENDIAN, error))
		return FALSE;
	fu_uefi_device_set_status(device_uefi, status);
	return TRUE;
}

#define VARIABLE_IDX_SIZE 11 /* of CHAR16 */

static gboolean
fu_uefi_cod_device_get_variable_idx(const gchar *name, guint *value, GError **error)
{
	gsize bufsz = 0;
	g_autofree guint8 *buf = NULL;
	g_autofree gchar *str = NULL;
	gunichar2 buf16[VARIABLE_IDX_SIZE] = {0x0};

	if (!fu_efivar_get_data(FU_EFIVAR_GUID_EFI_CAPSULE_REPORT, name, &buf, &bufsz, NULL, error))
		return FALSE;
	if (!fu_memcpy_safe((guint8 *)buf16,
			    sizeof(buf16),
			    0x0, /* dst */
			    buf,
			    bufsz,
			    0x0, /* src */
			    sizeof(buf16),
			    error))
		return FALSE;

	/* parse the value */
	str = g_utf16_to_utf8(buf16, VARIABLE_IDX_SIZE, NULL, NULL, error);
	if (str == NULL)
		return FALSE;
	if (!g_str_has_prefix(str, "Capsule")) {
		g_set_error(error,
			    G_IO_ERROR,
			    G_IO_ERROR_INVALID_DATA,
			    "wrong contents, got %s",
			    str);
		return FALSE;
	}
	if (value != NULL)
		*value = fu_common_strtoull(str + strlen("Capsule"));
	return TRUE;
}

static gboolean
fu_uefi_cod_device_get_results(FuDevice *device, GError **error)
{
	guint capsule_last = 1024;

	/* tell us where to stop */
	if (!fu_uefi_cod_device_get_variable_idx("CapsuleLast", &capsule_last, error))
		return FALSE;
	for (guint i = 0; i <= capsule_last; i++) {
		g_autoptr(GError) error_local = NULL;
		if (fu_uefi_cod_device_get_results_for_idx(device, i, &error_local))
			return TRUE;
		if (!g_error_matches(error_local, FWUPD_ERROR, FWUPD_ERROR_NOT_FOUND) &&
		    !g_error_matches(error_local, G_IO_ERROR, G_IO_ERROR_NOT_FOUND)) {
			g_propagate_error(error, g_steal_pointer(&error_local));
			return FALSE;
		}
	}

	/* nothing found */
	return TRUE;
}

static gboolean
fu_uefi_cod_device_write_firmware(FuDevice *device,
				  FuFirmware *firmware,
				  FwupdInstallFlags flags,
				  GError **error)
{
	FuUefiDevice *self = FU_UEFI_DEVICE(device);
	g_autofree gchar *basename = NULL;
	g_autofree gchar *cod_path = NULL;
	g_autofree gchar *esp_path = fu_uefi_device_get_esp_path(self);
	g_autoptr(GBytes) fw = NULL;

	/* ensure we have the existing state */
	if (fu_uefi_device_get_guid(self) == NULL) {
		g_set_error_literal(error,
				    FWUPD_ERROR,
				    FWUPD_ERROR_INTERNAL,
				    "cannot update device info with no GUID");
		return FALSE;
	}

	/* copy the capsule */
	fw = fu_firmware_get_bytes(firmware, error);
	if (fw == NULL)
		return FALSE;
	basename = g_strdup_printf("fwupd-%s.cap", fu_uefi_device_get_guid(self));
	cod_path = g_build_filename(esp_path, "EFI", "UpdateCapsule", basename, NULL);
	if (!fu_common_mkdir_parent(cod_path, error))
		return FALSE;
	if (!fu_common_set_contents_bytes(cod_path, fw, error))
		return FALSE;

	/*
	 * NOTE: The EFI spec requires setting OsIndications!
	 * RT->SetVariable is not supported for all hardware, and so when using
	 * U-Boot, it applies the capsule even if OsIndications isn't set.
	 * The capsule is then deleted by U-Boot after it has been deployed.
	 */
	if (!fu_device_has_private_flag(device, FU_UEFI_DEVICE_FLAG_NO_RT_SET_VARIABLE)) {
		gsize bufsz = 0;
		guint64 os_indications = 0;
		g_autofree guint8 *buf = NULL;
		if (!fu_efivar_get_data(FU_EFIVAR_GUID_EFI_GLOBAL,
					"OsIndications",
					&buf,
					&bufsz,
					NULL,
					error)) {
			g_prefix_error(error, "failed to read EFI variable: ");
			return FALSE;
		}
		if (!fu_common_read_uint64_safe(buf,
						bufsz,
						0x0,
						&os_indications,
						G_LITTLE_ENDIAN,
						error))
			return FALSE;
		os_indications |= EFI_OS_INDICATIONS_FILE_CAPSULE_DELIVERY_SUPPORTED;
		if (!fu_efivar_set_data(FU_EFIVAR_GUID_EFI_GLOBAL,
					"OsIndications",
					(guint8 *)&os_indications,
					sizeof(os_indications),
					FU_EFIVAR_ATTR_NON_VOLATILE |
					    FU_EFIVAR_ATTR_BOOTSERVICE_ACCESS |
					    FU_EFIVAR_ATTR_RUNTIME_ACCESS,
					error)) {
			g_prefix_error(error, "Could not set OsIndications: ");
			return FALSE;
		}
	}

	/* success */
	return TRUE;
}

static void
fu_uefi_cod_device_init(FuUefiCodDevice *self)
{
}

static void
fu_uefi_cod_device_class_init(FuUefiCodDeviceClass *klass)
{
	FuDeviceClass *klass_device = FU_DEVICE_CLASS(klass);
	klass_device->write_firmware = fu_uefi_cod_device_write_firmware;
	klass_device->get_results = fu_uefi_cod_device_get_results;
}