/**********************************************************/
/*  apimagic: cparser-based API normalization utility     */
/*  Copyright (C) 2015--2016  Z. Gilboa                   */
/*  Released under GPLv2 and GPLv3; see COPYING.APIMAGIC. */
/**********************************************************/

#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>

#include <cparser/driver/c_driver.h>
#include <cparser/driver/driver.h>
#include <cparser/driver/driver_t.h>
#include <cparser/driver/target.h>
#include <cparser/driver/tempfile.h>
#include <cparser/firm/ast2firm.h>
#include <cparser/firm/firm_opt.h>
#include <cparser/parser/parser.h>
#include <cparser/parser/preprocessor.h>

#define ARGV_DRIVER

#include <apimagic/apimagic.h>
#include "apimagic_driver_impl.h"
#include "argv/argv.h"

extern const struct argv_option amgc_default_options[];

struct amgc_driver_ctx_alloc {
	struct argv_meta *		meta;
	struct amgc_driver_ctx_impl	ctx;
	uint64_t			guard;
	const char *			units[];
};

static uint32_t amgc_argv_flags(uint32_t flags)
{
	uint32_t ret = 0;

	if (flags & AMGC_DRIVER_VERBOSITY_NONE)
		ret |= ARGV_VERBOSITY_NONE;

	if (flags & AMGC_DRIVER_VERBOSITY_ERRORS)
		ret |= ARGV_VERBOSITY_ERRORS;

	if (flags & AMGC_DRIVER_VERBOSITY_STATUS)
		ret |= ARGV_VERBOSITY_STATUS;

	return ret;
}

static int amgc_driver_usage(
	const char *			program,
	const char *			arg,
	const struct argv_option *	options,
	struct argv_meta *		meta)
{
	char header[512];

	snprintf(header,sizeof(header),
		"Usage: %s [options] <file>...\n" "Options:\n",
		program);

	argv_usage(stdout,header,options,arg);
	argv_free(meta);

	return AMGC_USAGE;
}

static struct amgc_driver_ctx_impl * amgc_driver_ctx_alloc(
	struct argv_meta *		meta,
	const struct amgc_common_ctx *	cctx,
	size_t				nunits)
{
	struct amgc_driver_ctx_alloc *	ictx;
	size_t				size;
	struct argv_entry *		entry;
	const char **			units;

	size =  sizeof(struct amgc_driver_ctx_alloc);
	size += (nunits+1)*sizeof(const char *);

	if (!(ictx = calloc(size,1)))
		return 0;

	if (cctx)
		memcpy(&ictx->ctx.cctx,cctx,sizeof(*cctx));

	for (entry=meta->entries,units=ictx->units; entry->fopt || entry->arg; entry++)
		if (!entry->fopt)
			*units++ = entry->arg;

	ictx->meta = meta;
	ictx->ctx.fdtmpin = -1;
	ictx->ctx.ctx.units = ictx->units;
	return &ictx->ctx;
}

static int amgc_get_driver_ctx_fail(struct argv_meta * meta)
{
	argv_free(meta);
	return -1;
}

static int amgc_init_cparser(void)
{
	init_temp_files();
	init_default_driver();
	init_driver();
	init_preprocessor();
	init_parser();
	init_ast();
	init_gen_firm();

	target_set_defaults();
	target_setup();

	return 0;
}

int amgc_get_driver_ctx(
	const char **			argv,
	const char **			envp,
	uint32_t			flags,
	struct amgc_driver_ctx **	pctx)
{
	struct amgc_driver_ctx_impl *	ctx;
	struct amgc_common_ctx		cctx;
	const struct argv_option *	options;
	struct argv_meta *		meta;
	struct argv_entry *		entry;
	size_t				nunits;
	const char *			program;

	options = amgc_default_options;

	if (!(meta = argv_get(argv,options,amgc_argv_flags(flags))))
		return -1;

	nunits	= 0;
	program = argv_program_name(argv[0]);
	memset(&cctx,0,sizeof(cctx));

	if (!argv[1] && (flags & AMGC_DRIVER_VERBOSITY_USAGE))
		return amgc_driver_usage(program,0,options,meta);

	/* compiler defaults */
	cctx.std = STANDARD_C99;

	/* get options, count units */
	for (entry=meta->entries; entry->fopt || entry->arg; entry++) {
		if (entry->fopt) {
			switch (entry->tag) {
				case TAG_HELP:
					if (flags & AMGC_DRIVER_VERBOSITY_USAGE)
						return amgc_driver_usage(program,entry->arg,options,meta);

				case TAG_VERSION:
					cctx.drvflags |= AMGC_DRIVER_VERSION;
					break;

				case TAG_LANG_STD:
					cctx.std = amgc_lang_std_from_string(entry->arg);
					break;
			}
		} else
			nunits++;
	}

	if (amgc_init_cparser())
		return amgc_get_driver_ctx_fail(meta);

	if (!(ctx = amgc_driver_ctx_alloc(meta,&cctx,nunits)))
		return amgc_get_driver_ctx_fail(meta);

	ctx->ctx.program	= program;
	ctx->ctx.cctx		= &ctx->cctx;
	ctx->cctx.ccenv		= &ctx->ccenv;

	*pctx = &ctx->ctx;
	return AMGC_OK;
}

int amgc_create_driver_ctx(
	const struct amgc_common_ctx *	cctx,
	struct amgc_driver_ctx **	pctx)
{
	struct argv_meta *		meta;
	struct amgc_driver_ctx_impl *	ctx;
	const char *			argv[] = {"apimagic_driver",0};

	if (!(meta = argv_get(argv,amgc_default_options,0)))
		return -1;

	if (!(ctx = amgc_driver_ctx_alloc(meta,cctx,0)))
		return amgc_get_driver_ctx_fail(0);

	ctx->ctx.cctx = &ctx->cctx;
	memcpy(&ctx->cctx,cctx,sizeof(*cctx));
	*pctx = &ctx->ctx;
	return AMGC_OK;
}

static void amgc_exit_cparser(void)
{
	exit_gen_firm();
	exit_ast2firm();
	exit_ast();
	exit_parser();
	exit_preprocessor();
	exit_driver();
	exit_default_driver();
	exit_temp_files();
}

static void amgc_free_driver_ctx_impl(struct amgc_driver_ctx_alloc * ictx)
{
	argv_free(ictx->meta);
	free(ictx);
	amgc_exit_cparser();
}

void amgc_free_driver_ctx(struct amgc_driver_ctx * ctx)
{
	struct amgc_driver_ctx_alloc *	ictx;
	uintptr_t			addr;

	if (ctx) {
		addr = (uintptr_t)ctx - offsetof(struct amgc_driver_ctx_alloc,ctx);
		addr = addr - offsetof(struct amgc_driver_ctx_impl,ctx);
		ictx = (struct amgc_driver_ctx_alloc *)addr;
		amgc_free_driver_ctx_impl(ictx);
	}
}