/*******************************************************************/
/*  slibtool: a skinny libtool implementation, written in C        */
/*  Copyright (C) 2016  Z. Gilboa                                  */
/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <slibtool/slibtool.h>
#include "slibtool_driver_impl.h"

#ifndef SLBT_DRIVER_FLAGS
#define SLBT_DRIVER_FLAGS	SLBT_DRIVER_VERBOSITY_ERRORS \
				| SLBT_DRIVER_VERBOSITY_USAGE
#endif

static const char vermsg[] = "%s (git://midipix.org/slibtool): "
			     "version %d.%d.%d.\n"
			     "[commit reference: %s]\n";

static ssize_t slibtool_version(struct slbt_driver_ctx * dctx)
{
	const struct slbt_source_version * verinfo;

	verinfo = slbt_source_version();

	return fprintf(stdout,vermsg,dctx->program,
			verinfo->major,verinfo->minor,verinfo->revision,
			verinfo->commit);
}

static void slibtool_perform_driver_actions(struct slbt_driver_ctx * dctx)
{
	if (dctx->cctx->drvflags & SLBT_DRIVER_CONFIG)
		dctx->nerrors += (slbt_output_config(dctx) < 0);

	if (dctx->cctx->mode == SLBT_MODE_COMPILE)
		dctx->nerrors += (slbt_exec_compile(dctx,0) < 0);

	if (dctx->cctx->mode == SLBT_MODE_INSTALL)
		dctx->nerrors += (slbt_exec_install(dctx,0) < 0);

	if (dctx->cctx->mode == SLBT_MODE_LINK)
		dctx->nerrors += (slbt_exec_link(dctx,0) < 0);
}

static void slibtool_perform_unit_actions(struct slbt_unit_ctx * uctx)
{
}

static int slibtool_exit(struct slbt_driver_ctx * dctx, int nerrors)
{
	slbt_free_driver_ctx(dctx);
	return nerrors ? 2 : 0;
}

int slibtool_main(int argc, char ** argv, char ** envp)
{
	int				ret;
	uint64_t			flags;
	struct slbt_driver_ctx *	dctx;
	struct slbt_unit_ctx *		uctx;
	const char **			unit;
	char *				program;
	char *				dash;
	char *				sargv[5];

	/* --version only? */
	if ((argc == 2) && (!strcmp(argv[1],"--version")
				|| !strcmp(argv[1],"--help-all")
				|| !strcmp(argv[1],"--help")
				|| !strcmp(argv[1],"-h"))) {
		sargv[0] = argv[0];
		sargv[1] = argv[1];
		sargv[2] = "--mode=compile";
		sargv[3] = "<compiler>";
		sargv[4] = 0;

		return (slbt_get_driver_ctx(sargv,envp,SLBT_DRIVER_FLAGS,&dctx))
			? 2 : (slibtool_version(dctx) < 0)
				? slibtool_exit(dctx,2)
				: slibtool_exit(dctx,0);
	}

	/* program */
	if ((program = strrchr(argv[0],'/')))
		program++;
	else
		program = argv[0];

	/* dash */
	if ((dash = strrchr(program,'-')))
		dash++;

	/* flags */
	if (dash == 0)
		flags = SLBT_DRIVER_FLAGS;

	else if (!(strcmp(dash,"shared")))
		flags = SLBT_DRIVER_FLAGS | SLBT_DRIVER_DISABLE_STATIC;

	else if (!(strcmp(dash,"static")))
		flags = SLBT_DRIVER_FLAGS | SLBT_DRIVER_DISABLE_SHARED;

	/* driver context */
	if ((ret = slbt_get_driver_ctx(argv,envp,flags,&dctx)))
		return (ret == SLBT_USAGE) ? !--argc : 2;

	if (dctx->cctx->drvflags & SLBT_DRIVER_VERSION)
		if ((slibtool_version(dctx)) < 0)
			return slibtool_exit(dctx,2);

	slibtool_perform_driver_actions(dctx);
	ret += dctx->nerrors;

	for (unit=dctx->units; *unit; unit++) {
		if (!(slbt_get_unit_ctx(dctx,*unit,&uctx))) {
			slibtool_perform_unit_actions(uctx);
			ret += uctx->nerrors;
			slbt_free_unit_ctx(uctx);
		}
	}

	return slibtool_exit(dctx,ret);
}

#ifndef SLIBTOOL_IN_A_BOX

int main(int argc, char ** argv, char ** envp)
{
	return slibtool_main(argc,argv,envp);
}

#endif