// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <subcmd/pager.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "color.h"
#include <math.h>
#include <unistd.h>

int perf_use_color_default = -1;

static int __color_vsnprintf(char *bf, size_t size, const char *color,
                             const char *fmt, va_list args, const char *trail)
{
        int r = 0;

        /*
         * Auto-detect:
         */
        if (perf_use_color_default < 0) {
                if (isatty(1) || pager_in_use())
                        perf_use_color_default = 1;
                else
                        perf_use_color_default = 0;
        }

        if (perf_use_color_default && *color)
                r += scnprintf(bf, size, "%s", color);
        r += vscnprintf(bf + r, size - r, fmt, args);
        if (perf_use_color_default && *color)
                r += scnprintf(bf + r, size - r, "%s", PERF_COLOR_RESET);
        if (trail)
                r += scnprintf(bf + r, size - r, "%s", trail);
        return r;
}

/* Colors are not included in return value */
static int __color_vfprintf(FILE *fp, const char *color, const char *fmt,
                va_list args)
{
        int r = 0;

        /*
         * Auto-detect:
         */
        if (perf_use_color_default < 0) {
                if (isatty(fileno(fp)) || pager_in_use())
                        perf_use_color_default = 1;
                else
                        perf_use_color_default = 0;
        }

        if (perf_use_color_default && *color)
                fprintf(fp, "%s", color);
        r += vfprintf(fp, fmt, args);
        if (perf_use_color_default && *color)
                fprintf(fp, "%s", PERF_COLOR_RESET);
        return r;
}

int color_vsnprintf(char *bf, size_t size, const char *color,
                    const char *fmt, va_list args)
{
        return __color_vsnprintf(bf, size, color, fmt, args, NULL);
}

int color_vfprintf(FILE *fp, const char *color, const char *fmt, va_list args)
{
        return __color_vfprintf(fp, color, fmt, args);
}

int color_snprintf(char *bf, size_t size, const char *color,
                   const char *fmt, ...)
{
        va_list args;
        int r;

        va_start(args, fmt);
        r = color_vsnprintf(bf, size, color, fmt, args);
        va_end(args);
        return r;
}

int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
{
        va_list args;
        int r;

        va_start(args, fmt);
        r = color_vfprintf(fp, color, fmt, args);
        va_end(args);
        return r;
}

const char *get_percent_color(double percent)
{
        const char *color = PERF_COLOR_NORMAL;

        /*
         * We color high-overhead entries in red, mid-overhead
         * entries in green - and keep the low overhead places
         * normal:
         */
        if (fabs(percent) >= MIN_RED)
                color = PERF_COLOR_RED;
        else {
                if (fabs(percent) > MIN_GREEN)
                        color = PERF_COLOR_GREEN;
        }
        return color;
}

int percent_color_fprintf(FILE *fp, const char *fmt, double percent)
{
        int r;
        const char *color;

        color = get_percent_color(percent);
        r = color_fprintf(fp, color, fmt, percent);

        return r;
}

int value_color_snprintf(char *bf, size_t size, const char *fmt, double value)
{
        const char *color = get_percent_color(value);
        return color_snprintf(bf, size, color, fmt, value);
}

int percent_color_snprintf(char *bf, size_t size, const char *fmt, ...)
{
        va_list args;
        double percent;

        va_start(args, fmt);
        percent = va_arg(args, double);
        va_end(args);
        return value_color_snprintf(bf, size, fmt, percent);
}

int percent_color_len_snprintf(char *bf, size_t size, const char *fmt, ...)
{
        va_list args;
        int len;
        double percent;
        const char *color;

        va_start(args, fmt);
        len = va_arg(args, int);
        percent = va_arg(args, double);
        va_end(args);

        color = get_percent_color(percent);
        return color_snprintf(bf, size, color, fmt, len, percent);
}