/***********************************************************/
/*  ntux: native translation und extension                 */
/*  Copyright (C) 2016  Z. Gilboa                          */
/*  Released under GPLv2 and GPLv3; see COPYING.NTUX.      */
/***********************************************************/

#include <ntapi/ntapi.h>
#include <psxscl/psxscl.h>
#include <stdint.h>

#include <ntux/ntux.h>
#include "ntux_init_impl.h"
#include "ntux_nolibc_impl.h"

#define ARGV_DRIVER

#include "ntux_version.h"
#include "ntux_driver_impl.h"
#include "argv/argv.h"

/* framework integration */
#include <psxtypes/section/midipix.h>

__attr_section_decl__(".midipix")
static const nt_tty_affiliation tty_affiliation
	__attr_section__(".midipix")
	= NT_TTY_AFFILIATION_DEFAULT;

/* ntapi accessor table */
const ntapi_vtbl * ntux_ntapi;

/* package info */
static const struct ntux_source_version ntux_src_version = {
	NTUX_TAG_VER_MAJOR,
	NTUX_TAG_VER_MINOR,
	NTUX_TAG_VER_PATCH,
	NTUX_GIT_VERSION
};

struct ntux_driver_ctx_alloc {
	struct argv_meta *		meta;
	struct ntux_driver_ctx_impl	ctx;
	uint64_t			guard;
	const char *			units[];
};

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

	if (flags & NTUX_DRIVER_VERBOSITY_NONE)
		ret |= ARGV_VERBOSITY_NONE;

	if (flags & NTUX_DRIVER_VERBOSITY_ERRORS)
		ret |= ARGV_VERBOSITY_ERRORS;

	if (flags & NTUX_DRIVER_VERBOSITY_STATUS)
		ret |= ARGV_VERBOSITY_STATUS;

	return ret;
}

static int ntux_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 NTUX_USAGE;
}

static struct ntux_driver_ctx_impl * ntux_driver_ctx_alloc(
	struct argv_meta *		meta,
	const struct ntux_common_ctx *	cctx,
	size_t				nunits)
{
	struct ntux_driver_ctx_alloc *	ictx;
	size_t				size;
	struct argv_entry *		entry;
	const char **			units;
	int				elements;

	(void)tty_affiliation;

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

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

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

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

	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.ctx.units = ictx->units;
	ictx->ctx.ctx.errv  = ictx->ctx.errinfp;
	return &ictx->ctx;
}

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

int ntux_get_driver_ctx(
	char **				argv,
	char **				envp,
	uint32_t			flags,
	struct ntux_driver_ctx **	pctx)
{
	struct ntux_driver_ctx_impl *	ctx;
	struct ntux_common_ctx		cctx;
	const struct argv_option *	options;
	struct argv_meta *		meta;
	struct argv_entry *		entry;
	size_t				nunits;
	const char *			program;

	(void)envp;

	options = ntux_default_options;

	if (ntux_init())
		return -1;

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

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

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

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

				case TAG_VERSION:
					cctx.drvflags |= NTUX_DRIVER_VERSION;
					break;
			}
		} else
			nunits++;
	}

	if (!(ctx = ntux_driver_ctx_alloc(meta,&cctx,nunits)))
		return ntux_get_driver_ctx_fail(meta);

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

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

int ntux_create_driver_ctx(
	const struct ntux_common_ctx *	cctx,
	struct ntux_driver_ctx **	pctx)
{
	struct argv_meta *		meta;
	struct ntux_driver_ctx_impl *	ctx;
	char *				argv[] = {"ntux_driver",0};

	if (ntux_init())
		return -1;

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

	if (!(ctx = ntux_driver_ctx_alloc(meta,cctx,0)))
		return ntux_get_driver_ctx_fail(0);

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

static void ntux_free_driver_ctx_impl(struct ntux_driver_ctx_alloc * ictx)
{
	argv_free(ictx->meta);
	free(ictx);
}

void ntux_free_driver_ctx(struct ntux_driver_ctx * ctx)
{
	struct ntux_driver_ctx_alloc *	ictx;
	uintptr_t			addr;

	if (ctx) {
		addr = (uintptr_t)ctx - offsetof(struct ntux_driver_ctx_impl,ctx);
		addr = addr - offsetof(struct ntux_driver_ctx_alloc,ctx);
		ictx = (struct ntux_driver_ctx_alloc *)addr;
		ntux_free_driver_ctx_impl(ictx);
	}
}

const struct ntux_source_version * ntux_source_version(void)
{
	return &ntux_src_version;
}