// posix_path.c - POSIX <-> native path translation
#include <stddef.h>
#include <string.h>
#include "posix_path.h"

static void FlipSlashes(char* s) {
    for (; *s; s++) if (*s == '/') *s = '\\';
}

static int IsDriveMount(const char* p) {
    return p && p[0] == '/' && p[1] >= '0' && p[1] <= '7' &&
           (p[2] == '\0' || p[2] == '/');
}

const char* PosixTranslatePath(const char* in, char* out, size_t outSize) {
    if (!in || !out || outSize < 4) return out;

    if (strcmp(in, "/dev/null") == 0) return SYNTH_DEVNULL;
    if (strcmp(in, "/dev/zero") == 0) return SYNTH_DEVZERO;

    if (IsDriveMount(in)) {
        out[0] = in[1];
        out[1] = ':';
        out[2] = '/';
        const char* rest = (in[2] == '/') ? in + 3 : "";
        size_t restLen = strlen(rest);
        if (restLen + 4 > outSize) restLen = outSize - 4;
        memcpy(out + 3, rest, restLen);
        out[3 + restLen] = '\0';
        FlipSlashes(out);
        return out;
    }

    if (in[0] == '/') {
        out[0] = '0';
        out[1] = ':';
        out[2] = '/';
        size_t rest = strlen(in + 1);
        if (rest + 4 > outSize) rest = outSize - 4;
        memcpy(out + 3, in + 1, rest);
        out[3 + rest] = '\0';
    } else {
        size_t len = strlen(in);
        if (len + 1 > outSize) len = outSize - 1;
        memcpy(out, in, len);
        out[len] = '\0';
    }

    FlipSlashes(out);
    return out;
}

void NativeToPosix(const char* in, char* out, size_t outSize) {
    if (!in || !out || outSize == 0) return;

    const char* src = in;
    char drive = 0;
    if (src[0] >= '0' && src[0] <= '7' && src[1] == ':' &&
        (src[2] == '\\' || src[2] == '/')) {
        drive = src[0];
        src += 3;
    }

    size_t pos = 0;
    if (drive && drive != '0') {
        if (outSize < 4) { out[0] = '\0'; return; }
        out[pos++] = '/';
        out[pos++] = drive;
        if (*src) out[pos++] = '/';
    } else {
        out[pos++] = '/';
    }

    while (*src && pos + 1 < outSize) {
        out[pos++] = (*src == '\\') ? '/' : *src;
        src++;
    }
    out[pos] = '\0';
}