#include <stdio.h>

#include <unistd.h>

#include <perk/perk.h>

#include <perk/perk_output.h>

#include "perk_version.h"

#ifndef PERK_DRIVER_FLAGS

#define PERK_DRIVER_FLAGS	PERK_DRIVER_VERBOSITY_ERRORS|PERK_DRIVER_VERBOSITY_USAGE

#endif

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

static ssize_t perk_version(struct pe_driver_ctx * dctx)

{

	char	buf[512];

	size_t	len;

	if (dctx->cctx->ioctx->fdout >= 0) {

		len = sprintf(buf,vermsg,dctx->program,PERK_GIT_VERSION);

		return write(dctx->cctx->ioctx->fdout,buf,len);

	} else

		return fprintf(stdout,vermsg,dctx->program,PERK_GIT_VERSION);

}

static ssize_t perk_paragraph_break(struct pe_unit_ctx * uctx, int * fpara)

{

	if (*fpara) {

		*fpara = 0;

		if (uctx->cctx->ioctx->fdout >= 0)

			return write(uctx->cctx->ioctx->fdout,"\n",1);

		else

			return fputc('\n',stdout);

	} else

		return 0;

}

static void perk_perform_unit_actions(struct pe_unit_ctx * uctx)

{

	int      fpara = 0;

	uint64_t flags = uctx->cctx->fmtflags;

	if (flags & PERK_OUTPUT_EXPORT_SYMS) {

		uctx->status = pe_output_export_symbols(uctx->meta,uctx->cctx,0);

		uctx->nerrors += !!uctx->status;

		fpara += uctx->meta->summary.nexpsyms;

	}

	if ((flags & PERK_OUTPUT_IMPORT_LIBS) || (flags & PERK_OUTPUT_IMPORT_SYMS)) {

		perk_paragraph_break(uctx,&fpara;;

		uctx->status = pe_output_import_libraries(uctx->meta,uctx->cctx,0);

		uctx->nerrors += !!uctx->status;

		fpara += (uctx->meta->summary.nimplibs > 0);

	}

}

static int perk_exit(struct pe_driver_ctx * dctx, int nerrors)

{

	pe_free_driver_ctx(dctx);

	return nerrors ? 2 : 0;

}

int perk_main(int argc, const char ** argv, const char ** envp)

{

	int			ret;

	struct pe_driver_ctx *	dctx;

	struct pe_unit_ctx *	uctx;

	const char **		unit;

	if ((ret = pe_get_driver_ctx(argv,envp,PERK_DRIVER_FLAGS,&dctx)))

		return (ret == PERK_USAGE) ? !--argc : 2;

	if (dctx->cctx->drvflags & PERK_DRIVER_VERSION)

		if ((perk_version(dctx)) < 0)

			return perk_exit(dctx,2);

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

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

			perk_perform_unit_actions(uctx);

			ret += uctx->nerrors;

			pe_free_unit_ctx(uctx);

		}

	}

	return perk_exit(dctx,ret);

}

#ifndef PERK_IN_A_BOX

int main(int argc, const char ** argv, const char ** envp)

{

	return perk_main(argc,argv,envp);

}

#endif