/**************************************************************/
/*  tpax: a topological pax implementation                    */
/*  Copyright (C) 2020--2021  SysDeer Technologies, LLC       */
/*  Released under GPLv2 and GPLv3; see COPYING.TPAX.         */
/**************************************************************/

#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <tpax/tpax.h>
#include "tpax_driver_impl.h"
#include "tpax_dprintf_impl.h"

#ifndef TPAX_DRIVER_FLAGS
#define TPAX_DRIVER_FLAGS	TPAX_DRIVER_VERBOSITY_ERRORS \
				| TPAX_DRIVER_VERBOSITY_USAGE \
				| TPAX_DRIVER_DIR_MEMBER_RECURSE
#endif

static const char vermsg[] = "%s%s%s (https://git.foss21.org/tpax): "
			     "version %s%d.%d.%d%s.\n"
			     "[commit reference: %s%s%s]\n";

static const char * const tpax_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 tpax_ver_plain[6] = {
		"","",
		"","",
		"",""
};

static ssize_t tpax_version(struct tpax_driver_ctx * dctx, int fdout)
{
	const struct tpax_source_version * verinfo;
	const char * const * verclr;

	verinfo = tpax_source_version();
	verclr  = isatty(fdout) ? tpax_ver_color : tpax_ver_plain;

	return tpax_dprintf(
			fdout,vermsg,
			verclr[0],dctx->program,verclr[1],
			verclr[2],verinfo->major,verinfo->minor,
			verinfo->revision,verclr[3],
			verclr[4],verinfo->commit,verclr[5]);
}

static void tpax_perform_unit_actions(
	const struct tpax_driver_ctx *	dctx,
	struct tpax_unit_ctx *		uctx)
{
	if (dctx->cctx->drvflags & TPAX_DRIVER_EXEC_MODE_WRITE)
		tpax_archive_append(dctx,uctx,0);
}

static int tpax_exit(struct tpax_driver_ctx * dctx, int ret)
{
	tpax_output_error_vector(dctx);
	tpax_free_driver_ctx(dctx);
	return ret;
}

int tpax_main(char ** argv, char ** envp, const struct tpax_fd_ctx * fdctx)
{
	int			ret;
	int			fdout;
	int                     fdcwd;
	uint64_t		flags;
	struct tpax_driver_ctx *	dctx;
	struct tpax_unit_ctx *	uctx;
	const char **		unit;

	flags = TPAX_DRIVER_FLAGS;
	fdout = fdctx ? fdctx->fdout : STDOUT_FILENO;
	fdcwd = fdctx ? fdctx->fdcwd : AT_FDCWD;

	if ((ret = tpax_get_driver_ctx(argv,envp,flags,fdctx,&dctx)))
		return (ret == TPAX_USAGE)
			? !argv || !argv[0] || !argv[1]
			: TPAX_ERROR;

	if (dctx->cctx->drvflags & TPAX_DRIVER_VERSION)
		if ((tpax_version(dctx,fdout)) < 0)
			return tpax_exit(dctx,TPAX_ERROR);

	for (unit=dctx->units; *unit; unit++) {
		if (!(tpax_get_unit_ctx(dctx,fdcwd,*unit,&uctx))) {
			tpax_perform_unit_actions(dctx,uctx);
			tpax_free_unit_ctx(uctx);
		}
	}

	if ((dctx->cctx->drvflags & TPAX_DRIVER_EXEC_MODE_WRITE) && dctx->units[0])
		tpax_archive_seal(dctx);

	return tpax_exit(dctx,dctx->errv[0] ? TPAX_ERROR : TPAX_OK);
}