/*
 * pack.c — 独立的前端文件打包工具（不依赖 mongoose）
 *
 * 编译: gcc -o pack pack.c
 * 用法: ./pack [-s strip_prefix] file1 file2 ... > packed_fs.c
 *
 * 生成的 C 文件包含：
 *   - struct mg_mem_file 定义
 *   - 每个文件的字节数组
 *   - mg_packed_files[] 索引表
 *   - mg_unpack() / mg_unlist() 实现
 */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

int main(int argc, char *argv[]) {
    int i, j, ch;
    const char *strip_prefix = "";

    printf("// Auto-generated — DO NOT EDIT\n");
    printf("#include \"mongoose.h\"\n");
    printf("\n");

    for (i = 1; i < argc; i++) {
        if (strcmp(argv[i], "-s") == 0) {
            strip_prefix = argv[++i];
        } else if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
            fprintf(stderr, "Usage: %s [-s STRIP_PREFIX] files...\n", argv[0]);
            exit(EXIT_FAILURE);
        } else {
            char ascii[16];
            FILE *fp = fopen(argv[i], "rb");
            if (fp == NULL) {
                fprintf(stderr, "Cannot open [%s]: %s\n", argv[i], strerror(errno));
                exit(EXIT_FAILURE);
            }

            printf("static const unsigned char v%d[] = {\n", i);
            for (j = 0; (ch = fgetc(fp)) != EOF; j++) {
                if (j == (int) sizeof(ascii)) {
                    printf(" // %.*s\n", j, ascii);
                    j = 0;
                }
                ascii[j] = (char) ((ch >= ' ' && ch <= '~' && ch != '\\') ? ch : '.');
                printf(" %3u,", ch);
            }
            printf(" 0 // %.*s\n};\n", j, ascii);
            fclose(fp);
        }
    }

    printf("\nconst struct mg_mem_file mg_packed_files[] = {\n");

    for (i = 1; i < argc; i++) {
        struct stat st;
        const char *name = argv[i];
        size_t n = strlen(strip_prefix);
        if (strcmp(argv[i], "-s") == 0) { i++; continue; }
        stat(argv[i], &st);
        if (strncmp(name, strip_prefix, n) == 0) name += n;
        printf("  {\"/%s\", v%d, sizeof(v%d) - 1, %lu},\n",
               name, i, i, (unsigned long) st.st_mtime);
    }
    printf("  {NULL, NULL, 0, 0}\n");
    printf("};\n");

    return EXIT_SUCCESS;
}