/***********************************************************/
/*  ntux: native translation und extension                 */
/*  Copyright (C) 2016--2018  Z. Gilboa                    */
/*  Released under GPLv2 and GPLv3; see COPYING.NTUX.      */
/***********************************************************/

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <psxabi/sys_errno.h>

#include <ntux/ntux.h>
#include "ntux_driver_impl.h"
#include "ntux_nolibc_impl.h"
#include "ntux_strerr_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 * ntux_output_error_header(const struct ntux_error_info * erri)
{
	if (erri->eflags & NTUX_ERROR_CHILD)
		return "exec error upon";

	else if (erri->eflags & NTUX_ERROR_TOP_LEVEL)
		return "error logged in";

	else if (erri->eflags & NTUX_ERROR_NESTED)
		return "< returned to >";

	else
		return "distorted state";
}

static const char * ntux_output_unit_header(const struct ntux_error_info * erri)
{
	if (!(erri->eflags & NTUX_ERROR_CUSTOM))
		return "while opening";

	else
		return "while querying";
}

static const char * ntux_output_strerror(
	const struct ntux_driver_ctx *	dctx,
	const struct ntux_error_info *	erri)
{
	struct ntux_driver_ctx_impl *	ictx;

	if (erri->eflags & NTUX_ERROR_NATIVE) {
		ictx = ntux_get_driver_ictx(dctx);
		ntux_sprintf(ictx->errsbuf,"system error: 0x%X",erri->elibcode);
		return ictx->errsbuf;
	}

	if (erri->eflags & NTUX_ERROR_CUSTOM)
		return "flow error: unexpected condition or other";

	else if (erri->eflags & NTUX_ERROR_NESTED)
		return "";

	else if (erri->eflags & NTUX_ERROR_CHILD)
		return "(see child process error messages)";

	else if (erri->esyscode == ENOBUFS)
		return "input error: string length exceeds buffer size.";

	else
		return ntux_strerror(dctx,erri->esyscode);
}

static int ntux_output_error_record_plain(
	const struct ntux_driver_ctx *	dctx,
	const struct ntux_error_info *	erri)
{
	const char * epath;
	const char * errdesc = ntux_output_strerror(dctx,erri);

	epath = erri->euctx
		? *erri->euctx->path
		: erri->eunit;

	if (epath && !(erri->eflags & NTUX_ERROR_NESTED))
		if (ntux_fprintf(stderr,"%s: [%s] '%s':\n",
				dctx->program,
				ntux_output_unit_header(erri),
				epath) < 0)
			return -1;

	if (fprintf(stderr,"%s: %s %s(), line %d%s%s.\n",
			dctx->program,
			ntux_output_error_header(erri),
			erri->efunction,
			erri->eline,
			strlen(errdesc) ? ": " : "",
			errdesc) < 0)
		return -1;

	return fflush(stderr);
}

static int ntux_output_error_record_annotated(
	const struct ntux_driver_ctx *	dctx,
	const struct ntux_error_info *	erri)
{
	const char * epath;
	const char * errdesc = ntux_output_strerror(dctx,erri);

	epath = erri->euctx
		? *erri->euctx->path
		: erri->eunit;

	if (epath && !(erri->eflags & NTUX_ERROR_NESTED))
		if (ntux_fprintf(
				stderr,
				"%s%s%s:%s %s[%s]%s %s%s'%s'%s:\n",

				aclr_bold,aclr_magenta,
				dctx->program,
				aclr_reset,

				aclr_bold,
				ntux_output_unit_header(erri),
				aclr_reset,

				aclr_bold,aclr_red,
				epath,
				aclr_reset) < 0)
			return -1;

	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,
			ntux_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,
			ntux_output_strerror(dctx,erri),
			aclr_reset) < 0)
		return -1;

	return fflush(stderr);
}

int ntux_output_error_record(
	const struct ntux_driver_ctx *	dctx,
	const struct ntux_error_info *	erri)
{
	if (dctx->cctx->drvflags & NTUX_DRIVER_ANNOTATE_NEVER)
		return ntux_output_error_record_plain(dctx,erri);

	else if (dctx->cctx->drvflags & NTUX_DRIVER_ANNOTATE_ALWAYS)
		return ntux_output_error_record_annotated(dctx,erri);

	else if (isatty(STDERR_FILENO))
		return ntux_output_error_record_annotated(dctx,erri);

	else
		return ntux_output_error_record_plain(dctx,erri);
}

static int ntux_output_error_vector_plain(const struct ntux_driver_ctx * dctx)
{
	struct ntux_error_info ** perr;

	for (perr=dctx->errv; *perr; perr++)
		if (ntux_output_error_record_plain(dctx,*perr))
			return -1;

	return 0;
}

static int ntux_output_error_vector_annotated(const struct ntux_driver_ctx * dctx)
{
	struct ntux_error_info ** perr;

	for (perr=dctx->errv; *perr; perr++)
		if (ntux_output_error_record_annotated(dctx,*perr))
			return -1;

	return 0;
}

int ntux_output_error_vector(const struct ntux_driver_ctx * dctx)
{
	if (dctx->cctx->drvflags & NTUX_DRIVER_ANNOTATE_NEVER)
		return ntux_output_error_vector_plain(dctx);

	else if (dctx->cctx->drvflags & NTUX_DRIVER_ANNOTATE_ALWAYS)
		return ntux_output_error_vector_annotated(dctx);

	else if (isatty(STDERR_FILENO))
		return ntux_output_error_vector_annotated(dctx);

	else
		return ntux_output_error_vector_plain(dctx);
}