/*******************************************************************/

/*  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 <errno.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%s%s (git://midipix.org/slibtool): "

			     "version %s%d.%d.%d%s.\n"

			     "%s%s%s%s%s\n";

static const char * const slbt_ver_color[6] = {

		"\x1b[1m\x1b[35m","\x1b[0m",

		"\x1b[1m\x1b[32m","\x1b[0m",

		"\x1b[1m\x1b[34m","\x1b[0m"

};

static const char * const slbt_ver_plain[6] = {

		"","",

		"","",

		"",""

};

static ssize_t slbt_version(struct slbt_driver_ctx * dctx)

{

	const struct slbt_source_version * verinfo;

	const char * const * verclr;

	bool gitver;

	verinfo = slbt_source_version();

	verclr  = isatty(STDOUT_FILENO) ? slbt_ver_color : slbt_ver_plain;

	gitver  = strcmp(verinfo->commit,"unknown");

	return fprintf(stdout,vermsg,

			verclr[0],dctx->program,verclr[1],

			verclr[2],verinfo->major,verinfo->minor,

			verinfo->revision,verclr[3],

			gitver ? "[commit reference: " : "",

			verclr[4],gitver ? verinfo->commit : "",

			verclr[5],gitver ? "]" : "");

}

static void slbt_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_EXECUTE)

		dctx->nerrors += (slbt_exec_execute(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 slbt_perform_unit_actions(struct slbt_unit_ctx * uctx)

{

	(void)uctx;

}

static int slbt_exit(struct slbt_driver_ctx * dctx, int nerrors)

{

	if (nerrors && errno)

		strerror(errno);

	slbt_free_driver_ctx(dctx);

	return nerrors ? 2 : 0;

}

int slbt_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 : (slbt_version(dctx) < 0)

				? slbt_exit(dctx,2)

				: slbt_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;

	else

		flags = SLBT_DRIVER_FLAGS;

	/* debug */

	if (!(strcmp(program,"dlibtool")))

		flags |= SLBT_DRIVER_DEBUG;

	else if (!(strncmp(program,"dlibtool",8)))

		if ((program[8] == '-') || (program[8] == '.'))

			flags |= SLBT_DRIVER_DEBUG;

	/* legabits */

	if (!(strcmp(program,"clibtool")))

		flags |= SLBT_DRIVER_LEGABITS;

	else if (!(strncmp(program,"clibtool",8)))

		if ((program[8] == '-') || (program[8] == '.'))

			flags |= SLBT_DRIVER_LEGABITS;

	/* 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 ((slbt_version(dctx)) < 0)

			return slbt_exit(dctx,2);

	slbt_perform_driver_actions(dctx);

	ret += dctx->nerrors;

	for (unit=dctx->units; *unit; unit++) {

		if (!(slbt_get_unit_ctx(dctx,*unit,&uctx))) {

			slbt_perform_unit_actions(uctx);

			ret += uctx->nerrors;

			slbt_free_unit_ctx(uctx);

		}

	}

	return slbt_exit(dctx,ret);

}