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

/*  tpax: a topological pax implementation                    */

/*  Copyright (C) 2020--2021  SysDeer Technologies, LLC       */

/*  Released under GPLv2 and GPLv3; see COPYING.TPAX.         */

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

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <unistd.h>

#include <tpax/tpax.h>

#include "tpax_driver_impl.h"

#include "tpax_dprintf_impl.h"

static const char aclr_reset[]   = "\x1b[0m";

static const char aclr_bold[]    = "\x1b[1m";

static const char aclr_red[]     = "\x1b[31m";

static const char aclr_green[]   = "\x1b[32m";

static const char aclr_blue[]    = "\x1b[34m";

static const char aclr_magenta[] = "\x1b[35m";

static const char * const tpax_error_strings[TPAX_ERR_CAP] = {

	[TPAX_ERR_FLOW_ERROR]      = "flow error: unexpected condition or other",

	[TPAX_ERR_FLEE_ERROR]      = "flees and bugs and cats and mice",

	[TPAX_ERR_NULL_CONTEXT]    = "null driver or unit context",

	[TPAX_ERR_BAD_DATA]        = "corrupt or wrong daata",

	[TPAX_ERR_FILE_CHANGED]    = "file has changed",

	[TPAX_ERR_REGION_SIZE]     = "file too large for a memory snapshot",

};

static const char * tpax_output_error_header(const struct tpax_error_info * erri)

{

	if (erri->eflags & TPAX_ERROR_CHILD)

		return "exec error upon";

	else if (erri->eflags & TPAX_ERROR_TOP_LEVEL)

		return "error logged in";

	else if (erri->eflags & TPAX_ERROR_NESTED)

		return "< returned to >";

	else

		return "distorted state";

}

static const char * tpax_output_unit_header(const struct tpax_error_info * erri)

{

	if (!(erri->eflags & TPAX_ERROR_CUSTOM))

		return "while opening";

	else

		return "while parsing";

}

static const char * tpax_output_strerror(

	const struct tpax_error_info * erri,

	char (*errbuf)[256])

{

	if (erri->eflags & TPAX_ERROR_CUSTOM)

		return ((erri->elibcode < 0) || (erri->elibcode >= TPAX_ERR_CAP))

			? "internal error: please report to the maintainer"

			: tpax_error_strings[erri->elibcode];

	else if (erri->eflags & TPAX_ERROR_NESTED)

		return "";

	else if (erri->eflags & TPAX_ERROR_CHILD)

		return "(see child process error messages)";

	else if (erri->esyscode == ENOBUFS)

		return "input error: string length exceeds buffer size";

	else

		return strerror_r(erri->esyscode,*errbuf,sizeof(*errbuf))

			? "internal error: strerror_r(3) call failed"

			: *errbuf;

}

static int tpax_output_error_record_plain(

	const struct tpax_driver_ctx *	dctx,

	const struct tpax_error_info *	erri)

{

	const char * epath;

	char         errbuf[256];

	int          fderr   = tpax_driver_fderr(dctx);

	const char * errdesc = tpax_output_strerror(erri,&errbuf);

	epath = erri->euctx

		? *erri->euctx->path

		: erri->eunit;

	if (epath && !(erri->eflags & TPAX_ERROR_NESTED))

		if (tpax_dprintf(

				fderr,

				"%s: [%s] '%s':\n",

				dctx->program,

				tpax_output_unit_header(erri),

				epath) < 0)

			return -1;

	if (tpax_dprintf(

			fderr,

			"%s: %s %s(), line %d%s%s.\n",

			dctx->program,

			tpax_output_error_header(erri),

			erri->efunction,

			erri->eline,

			strlen(errdesc) ? ": " : "",

			errdesc) < 0)

		return -1;

	return 0;

}

static int tpax_output_error_record_annotated(

	const struct tpax_driver_ctx *	dctx,

	const struct tpax_error_info *	erri)

{

	const char * epath;

	char         errbuf[256];

	int          fderr   = tpax_driver_fderr(dctx);

	const char * errdesc = tpax_output_strerror(erri,&errbuf);

	epath = erri->euctx

		? *erri->euctx->path

		: erri->eunit;

	if (epath && !(erri->eflags & TPAX_ERROR_NESTED))

		if (tpax_dprintf(

				fderr,

				"%s%s%s:%s %s[%s]%s %s%s'%s'%s:\n",

				aclr_bold,aclr_magenta,

				dctx->program,

				aclr_reset,

				aclr_bold,

				tpax_output_unit_header(erri),

				aclr_reset,

				aclr_bold,aclr_red,

				epath,

				aclr_reset) < 0)

			return -1;

	if (tpax_dprintf(

			fderr,

			"%s%s%s:%s %s%s%s %s%s%s()%s, %s%sline %d%s%s%s%s%s.\n",

			aclr_bold,aclr_magenta,

			dctx->program,

			aclr_reset,

			aclr_bold,

			tpax_output_error_header(erri),

			aclr_reset,

			aclr_bold,aclr_blue,

			erri->efunction,

			aclr_reset,

			aclr_bold,aclr_green,

			erri->eline,

			aclr_reset,

			strlen(errdesc) ? ": " : "",

			aclr_bold,

			errdesc,

			aclr_reset) < 0)

		return -1;

	return 0;

}

int tpax_output_error_record(

	const struct tpax_driver_ctx *	dctx,

	const struct tpax_error_info *	erri)

{

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

		return tpax_output_error_record_plain(dctx,erri);

	else if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_ALWAYS)

		return tpax_output_error_record_annotated(dctx,erri);

	else if (isatty(tpax_driver_fderr(dctx)))

		return tpax_output_error_record_annotated(dctx,erri);

	else

		return tpax_output_error_record_plain(dctx,erri);

}

static int tpax_output_error_vector_plain(const struct tpax_driver_ctx * dctx)

{

	struct tpax_error_info ** perr;

	for (perr=dctx->errv; *perr; perr++)

		if (tpax_output_error_record_plain(dctx,*perr))

			return -1;

	return 0;

}

static int tpax_output_error_vector_annotated(const struct tpax_driver_ctx * dctx)

{

	struct tpax_error_info ** perr;

	for (perr=dctx->errv; *perr; perr++)

		if (tpax_output_error_record_annotated(dctx,*perr))

			return -1;

	return 0;

}

int tpax_output_error_vector(const struct tpax_driver_ctx * dctx)

{

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

		return tpax_output_error_vector_plain(dctx);

	else if (dctx->cctx->drvflags & TPAX_DRIVER_ANNOTATE_ALWAYS)

		return tpax_output_error_vector_annotated(dctx);

	else if (isatty(tpax_driver_fderr(dctx)))

		return tpax_output_error_vector_annotated(dctx);

	else

		return tpax_output_error_vector_plain(dctx);

}