/**********************************************************/
/*  apimagic: cparser-based API normalization utility     */
/*  Copyright (C) 2015--2021  SysDeer Technologies, LLC   */
/*  Released under GPLv2 and GPLv3; see COPYING.APIMAGIC. */
/**********************************************************/

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

#include <cparser/ast/type_t.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_version.h"
#include "apimagic_driver_impl.h"
#include "argv/argv.h"

/* package info */
static const struct amgc_source_version amgc_src_version = {
	AMGC_TAG_VER_MAJOR,
	AMGC_TAG_VER_MINOR,
	AMGC_TAG_VER_PATCH,
	APIMAGIC_GIT_VERSION
};

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

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

	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(
	int				fdout,
	const char *			program,
	const char *			arg,
	const struct argv_option **	optv,
	struct argv_meta *		meta)
{
	char header[512];

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

	argv_usage(fdout,header,optv,arg);
	argv_free(meta);

	return AMGC_USAGE;
}

static struct amgc_driver_ctx_impl * amgc_driver_ctx_alloc(
	struct argv_meta *		meta,
	const struct amgc_fd_ctx *	fdctx,
	const struct amgc_common_ctx *	cctx,
	size_t				nunits,
	size_t				nactions)
{
	struct amgc_driver_ctx_alloc *	ictx;
	struct amgc_action *		actions;
	size_t				size;
	struct argv_entry *		entry;
	const char **			aunits;
	int				elements;

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

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

	if (!(actions = calloc(nactions+1,sizeof(*ictx->actions)))) {
		free(ictx);
		return 0;
	}

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

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

	elements = sizeof(ictx->ctx.erribuf) / sizeof(*ictx->ctx.erribuf);

	ictx->ctx.errinfp  = &ictx->ctx.erriptr[0];
	ictx->ctx.erricap  = &ictx->ctx.erriptr[--elements];

	ictx->meta = meta;
	ictx->ctx.fdtmpin = -1;
	ictx->actions = actions;
	ictx->ctx.actions = actions;
	ictx->ctx.ctx.units = ictx->units;
	ictx->ctx.ctx.errv  = ictx->ctx.errinfp;
	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_firm_opt();
	init_firm_target();

	target_setup();

	return 0;
}

int amgc_get_driver_ctx(
	char **				argv,
	char **				envp,
	uint32_t			flags,
	const struct amgc_fd_ctx *	fdctx,
	struct amgc_driver_ctx **	pctx)
{
	struct amgc_driver_ctx_impl *	ctx;
	struct amgc_common_ctx		cctx;
	const struct argv_option *	optv[AMGC_OPTV_ELEMENTS];
	struct argv_meta *		meta;
	struct argv_entry *		entry;
	size_t				nunits;
	size_t				nactions;
	const char *			program;

	(void)envp;

	if (!fdctx) {
		fdctx = &(const struct amgc_fd_ctx) {
			.fdin  = STDIN_FILENO,
			.fdout = STDOUT_FILENO,
			.fderr = STDERR_FILENO,
			.fdlog = (-1),
			.fdcwd = AT_FDCWD,
			.fddst = AT_FDCWD,
		};
	}

	argv_optv_init(amgc_default_options,optv);

	if (!(meta = argv_get(
			argv,optv,
			amgc_argv_flags(flags),
			fdctx->fderr)))
		return -1;

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

	if (!argv[1] && (flags & AMGC_DRIVER_VERBOSITY_USAGE))
		return amgc_driver_usage(
			fdctx->fderr,
			program,0,
			optv,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(
							fdctx->fderr,
							program,entry->arg,
							optv,meta);

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

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

				default:
					nactions++;
					break;
			}
		} else
			nunits++;
	}

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

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

	/* create action vector */
	for (entry=meta->entries,nactions=0; entry->fopt || entry->arg; entry++)
		if (entry->fopt)
			switch (entry->tag) {
				case TAG_PRINT_ENUMS:
					ctx->actions[nactions].type = AMGC_ACTION_OUTPUT;
					ctx->actions[nactions++].action = AMGC_OUTPUT_ENUM;
					break;

				case TAG_LIST_ENUMS:
					ctx->actions[nactions].type = AMGC_ACTION_OUTPUT;
					ctx->actions[nactions++].action = AMGC_LIST_ENUM;
					break;

				case TAG_PRINT_TYPEDEFS:
					ctx->actions[nactions].type = AMGC_ACTION_OUTPUT;
					ctx->actions[nactions].action = AMGC_OUTPUT_TYPEDEF;

					if (!strcmp("primary",entry->arg))
						ctx->actions[nactions++].subset = TYPE_ATOMIC;
					break;

				case TAG_PRINT_STRUCTS:
					ctx->actions[nactions].type = AMGC_ACTION_OUTPUT;
					ctx->actions[nactions++].action = AMGC_OUTPUT_STRUCT;
					break;

				case TAG_PRINT_UNIONS:
					ctx->actions[nactions].type = AMGC_ACTION_OUTPUT;
					ctx->actions[nactions++].action = AMGC_OUTPUT_UNION;
					break;
			}

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

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

static void amgc_exit_cparser(void)
{
	exit_firm_opt();
	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->actions);
	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_impl,ctx);
		addr = addr - offsetof(struct amgc_driver_ctx_alloc,ctx);
		ictx = (struct amgc_driver_ctx_alloc *)addr;
		amgc_free_driver_ctx_impl(ictx);
	}
}

const struct amgc_source_version * amgc_source_version(void)
{
	return &amgc_src_version;
}

int amgc_get_driver_fdctx(
	const struct amgc_driver_ctx *	dctx,
	struct amgc_fd_ctx *		fdctx)
{
	struct amgc_driver_ctx_impl *	ictx;

	ictx = amgc_get_driver_ictx(dctx);

	fdctx->fdin  = ictx->fdctx.fdin;
	fdctx->fdout = ictx->fdctx.fdout;
	fdctx->fderr = ictx->fdctx.fderr;
	fdctx->fdlog = ictx->fdctx.fdlog;
	fdctx->fdcwd = ictx->fdctx.fdcwd;
	fdctx->fddst = ictx->fdctx.fddst;

	return 0;
}

int amgc_set_driver_fdctx(
	struct amgc_driver_ctx *	dctx,
	const struct amgc_fd_ctx *	fdctx)
{
	struct amgc_driver_ctx_impl *	ictx;

	ictx = amgc_get_driver_ictx(dctx);

	ictx->fdctx.fdin  = fdctx->fdin;
	ictx->fdctx.fdout = fdctx->fdout;
	ictx->fdctx.fderr = fdctx->fderr;
	ictx->fdctx.fdlog = fdctx->fdlog;
	ictx->fdctx.fdcwd = fdctx->fdcwd;
	ictx->fdctx.fddst = fdctx->fddst;

	return 0;
}