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

/*  slibtool: a skinny libtool implementation, written in C        */

/*  Copyright (C) 2016--2017  Z. Gilboa                            */

/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */

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

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <unistd.h>

#include <slibtool/slibtool.h>

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

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

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

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

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

static const char * slbt_output_error_header(const struct slbt_error_info * erri)

{

	if (erri->eflags & SLBT_ERROR_CHILD)

		return "exec error upon";

	else if (erri->eflags & SLBT_ERROR_TOP_LEVEL)

		return "error logged in";

	else if (erri->eflags & SLBT_ERROR_NESTED)

		return "< returned to >";

	else

		return "distorted state";

}

static const char * slbt_output_strerror(const struct slbt_error_info * erri)

{

	if (erri->eflags & SLBT_ERROR_CUSTOM)

		return "flow error: unexpected condition or other";

	else if (erri->eflags & SLBT_ERROR_NESTED)

		return "";

	else if (erri->eflags & SLBT_ERROR_CHILD)

		return "(see child process error messages)";

	else if (erri->esyscode == ENOBUFS)

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

	else

		return strerror(erri->esyscode);

}

static int slbt_output_error_record_plain(

	const struct slbt_driver_ctx *	dctx,

	const struct slbt_error_info *	erri)

{

	const char * errdesc = slbt_output_strerror(erri);

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

			dctx->program,

			slbt_output_error_header(erri),

			erri->efunction,

			erri->eline,

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

			errdesc) < 0)

		return -1;

	return fflush(stderr);

}

static int slbt_output_error_record_annotated(

	const struct slbt_driver_ctx *	dctx,

	const struct slbt_error_info *	erri)

{

	const char * errdesc = slbt_output_strerror(erri);

	if (fprintf(

			stderr,

			"%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,

			slbt_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,

			slbt_output_strerror(erri),

			aclr_reset) < 0)

		return -1;

	return fflush(stderr);

}

int slbt_output_error_record(

	const struct slbt_driver_ctx *	dctx,

	const struct slbt_error_info *	erri)

{

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

		return slbt_output_error_record_plain(dctx,erri);

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

		return slbt_output_error_record_annotated(dctx,erri);

	else if (isatty(STDERR_FILENO))

		return slbt_output_error_record_annotated(dctx,erri);

	else

		return slbt_output_error_record_plain(dctx,erri);

}

static int slbt_output_error_vector_plain(const struct slbt_driver_ctx * dctx)

{

	struct slbt_error_info ** perr;

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

		if (slbt_output_error_record_plain(dctx,*perr))

			return -1;

	return 0;

}

static int slbt_output_error_vector_annotated(const struct slbt_driver_ctx * dctx)

{

	struct slbt_error_info ** perr;

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

		if (slbt_output_error_record_annotated(dctx,*perr))

			return -1;

	return 0;

}

int slbt_output_error_vector(const struct slbt_driver_ctx * dctx)

{

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

		return slbt_output_error_vector_plain(dctx);

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

		return slbt_output_error_vector_annotated(dctx);

	else if (isatty(STDERR_FILENO))

		return slbt_output_error_vector_annotated(dctx);

	else

		return slbt_output_error_vector_plain(dctx);

}