#define _POSIX_C_SOURCE 200809L
#include "config.h"
#include <stdio.h>
#include <string.h>
#ifdef _WIN32
#  include <direct.h>
#  define MAKE_DIR(p) _mkdir(p)
#else
#  include <sys/stat.h>
#  define MAKE_DIR(p) mkdir(p, 0755)
#endif

void configSanitizeName(const char *in, char *out, int maxLen)
{
    int i = 0;
    for (; in[i] && i < maxLen - 1; i++) {
        char c = in[i];
        if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') ||
            (c >= '0' && c <= '9') || c == '_' || c == '-')
            out[i] = c;
        else
            out[i] = '_';
    }
    out[i] = '\0';
}

int configSaveLastDevice(const char *deviceName)
{
    MAKE_DIR(CONFIG_DIR);
    FILE *f = fopen(CONFIG_DIR "/last_device.txt", "w");
    if (!f) return 0;
    fprintf(f, "%s\n", deviceName);
    fclose(f);
    return 1;
}

int configLoadLastDevice(char *out, int maxLen)
{
    FILE *f = fopen(CONFIG_DIR "/last_device.txt", "r");
    if (!f) return 0;
    int ok = (fgets(out, maxLen, f) != NULL);
    fclose(f);
    if (!ok) return 0;
    int len = (int)strlen(out);
    if (len > 0 && out[len - 1] == '\n') out[len - 1] = '\0';
    return out[0] != '\0';
}

int configSaveCcMappings(const char *deviceName, ConfigCcEntry *entries, int count)
{
    MAKE_DIR(CONFIG_DIR);
    char safe[CONFIG_NAME_LEN];
    configSanitizeName(deviceName, safe, sizeof(safe));
    char path[CONFIG_NAME_LEN + 32];
    snprintf(path, sizeof(path), CONFIG_DIR "/cc_%s.cfg", safe);

    FILE *f = fopen(path, "w");
    if (!f) return 0;
    for (int i = 0; i < count; i++)
        fprintf(f, "%d %d %f %f\n",
                entries[i].cc, entries[i].controlId,
                entries[i].min, entries[i].max);
    fclose(f);
    return 1;
}

int configLoadCcMappings(const char *deviceName, ConfigCcEntry *entries, int maxCount)
{
    char safe[CONFIG_NAME_LEN];
    configSanitizeName(deviceName, safe, sizeof(safe));
    char path[CONFIG_NAME_LEN + 32];
    snprintf(path, sizeof(path), CONFIG_DIR "/cc_%s.cfg", safe);

    FILE *f = fopen(path, "r");
    if (!f) return 0;
    int count = 0;
    while (count < maxCount) {
        int   cc, id;
        float mn, mx;
        if (fscanf(f, "%d %d %f %f\n", &cc, &id, &mn, &mx) != 4) break;
        if (cc >= 0 && cc < 128) {
            entries[count].cc        = cc;
            entries[count].controlId = id;
            entries[count].min       = mn;
            entries[count].max       = mx;
            count++;
        }
    }
    fclose(f);
    return count;
}