/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
 */

/* Extension copy
 * --------------
 *
 * Authors: Stephan Bosch
 * Specification: RFC 3894
 * Implementation: full
 * Status: testing
 *
 */

#include "sieve-common.h"

#include "sieve-code.h"
#include "sieve-extensions.h"
#include "sieve-actions.h"
#include "sieve-commands.h"
#include "sieve-validator.h"
#include "sieve-generator.h"
#include "sieve-interpreter.h"
#include "sieve-result.h"

#include "sieve-ext-copy.h"

/*
 * Forward declarations
 */

static const struct sieve_argument_def copy_tag;
static const struct sieve_operand_def copy_side_effect_operand;

/*
 * Extension
 */

static bool
ext_copy_validator_load(const struct sieve_extension *ext,
			struct sieve_validator *valdtr);

const struct sieve_extension_def copy_extension = {
	.name = "copy",
	.validator_load = ext_copy_validator_load,
	SIEVE_EXT_DEFINE_OPERAND(copy_side_effect_operand),
};

static bool
ext_copy_validator_load(const struct sieve_extension *ext,
			struct sieve_validator *valdtr)
{
	/* Register copy tag with redirect and fileinto commands and we don't
	   care whether these commands are registered or even whether they will
	   be registered at all. The validator handles either situation
	   gracefully.
	 */
	sieve_validator_register_external_tag(valdtr, "redirect", ext,
					      &copy_tag, SIEVE_OPT_SIDE_EFFECT);
	sieve_validator_register_external_tag(valdtr, "fileinto", ext,
					      &copy_tag, SIEVE_OPT_SIDE_EFFECT);
	return TRUE;
}

/*
 * Side effect
 */

static void
seff_copy_print(const struct sieve_side_effect *seffect,
		const struct sieve_action *action,
		const struct sieve_result_print_env *rpenv, bool *keep);
static int
seff_copy_post_execute(const struct sieve_side_effect *seffect ATTR_UNUSED,
		       const struct sieve_action_exec_env *aenv ATTR_UNUSED,
		       void *tr_context ATTR_UNUSED,
		       void *se_tr_context ATTR_UNUSED, bool *keep);

const struct sieve_side_effect_def copy_side_effect = {
	SIEVE_OBJECT("copy", &copy_side_effect_operand, 0),
	.to_action = &act_store,
	.print = seff_copy_print,
	.post_execute = seff_copy_post_execute,
};

/*
 * Tagged argument
 */

static bool
tag_copy_validate(struct sieve_validator *valdtr,
		  struct sieve_ast_argument **arg, struct sieve_command *cmd);
static bool
tag_copy_generate(const struct sieve_codegen_env *cgenv,
		  struct sieve_ast_argument *arg, struct sieve_command *cmd);

static const struct sieve_argument_def copy_tag = {
	.identifier = "copy",
	.validate = tag_copy_validate,
	.generate = tag_copy_generate,
};

/*
 * Operand
 */

static const struct sieve_extension_objects ext_side_effects =
	SIEVE_EXT_DEFINE_SIDE_EFFECT(copy_side_effect);

static const struct sieve_operand_def copy_side_effect_operand = {
	.name = "copy operand",
	.ext_def = &copy_extension,
	.class = &sieve_side_effect_operand_class,
	.interface = &ext_side_effects,
};

/*
 * Tag registration
 */

void sieve_ext_copy_register_tag(struct sieve_validator *valdtr,
				 const struct sieve_extension *copy_ext,
				 const char *command)
{
	if (sieve_validator_extension_loaded(valdtr, copy_ext)) {
		sieve_validator_register_external_tag(
			valdtr, command, copy_ext, &copy_tag,
			SIEVE_OPT_SIDE_EFFECT);
	}
}

/*
 * Tag validation
 */

static bool
tag_copy_validate(struct sieve_validator *valdtr ATTR_UNUSED,
		  struct sieve_ast_argument **arg ATTR_UNUSED,
		  struct sieve_command *cmd ATTR_UNUSED)
{
	*arg = sieve_ast_argument_next(*arg);

	return TRUE;
}

/*
 * Code generation
 */

static bool
tag_copy_generate(const struct sieve_codegen_env *cgenv,
		  struct sieve_ast_argument *arg,
		  struct sieve_command *cmd ATTR_UNUSED)
{
	if (sieve_ast_argument_type(arg) != SAAT_TAG)
		return FALSE;

	sieve_opr_side_effect_emit(cgenv->sblock, sieve_argument_ext(arg),
				   &copy_side_effect);
	return TRUE;
}

/*
 * Side effect implementation
 */

static void
seff_copy_print(const struct sieve_side_effect *seffect ATTR_UNUSED,
		const struct sieve_action *action ATTR_UNUSED,
		const struct sieve_result_print_env *rpenv, bool *keep)
{
	sieve_result_seffect_printf(rpenv, "preserve implicit keep");
	*keep = TRUE;
}

static int
seff_copy_post_execute(const struct sieve_side_effect *seffect ATTR_UNUSED,
		       const struct sieve_action_exec_env *aenv ATTR_UNUSED,
		       void *tr_context ATTR_UNUSED,
		       void *se_tr_context ATTR_UNUSED, bool *keep)
{
	*keep = TRUE;
	return SIEVE_EXEC_OK;
}