/* SPDX-License-Identifier: AGPL-3.0-or-later */
/* Copyright (C) 2026 David (Corey) Herrera */
/*
 * ternarize-merge: Assemble final safetensors with packed ternary weights + scales.
 *
 * Usage:
 *   ternarize-merge --workdir ./work --output ternary-model.safetensors
 */

#include "../ternarize/ternarize.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static void usage(const char *prog) {
    fprintf(stderr, "Usage: %s --workdir <dir> --output <output.safetensors>\n", prog);
    fprintf(stderr, "\nOptions:\n");
    fprintf(stderr, "  --workdir  Work directory (with completed flip layers)\n");
    fprintf(stderr, "  --output   Output safetensors file path\n");
    fprintf(stderr, "  --config   Path to config.json (re-parse architecture)\n");
}

int main(int argc, char **argv) {
    ft_config cfg = ft_config_defaults();
    const char *workdir = NULL;
    const char *output = NULL;
    const char *config_path = NULL;

    for (int i = 1; i < argc; i++) {
        if (strcmp(argv[i], "--workdir") == 0 && i + 1 < argc) {
            workdir = argv[++i];
        } else if (strcmp(argv[i], "--output") == 0 && i + 1 < argc) {
            output = argv[++i];
        } else if (strcmp(argv[i], "--config") == 0 && i + 1 < argc) {
            config_path = argv[++i];
        } else if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) {
            usage(argv[0]);
            return 0;
        } else {
            fprintf(stderr, "Unknown option: %s\n", argv[i]);
            usage(argv[0]);
            return 1;
        }
    }

    if (!workdir || !output) {
        usage(argv[0]);
        return 1;
    }

    if (config_path) {
        if (!ft_config_from_json(&cfg, config_path)) {
            fprintf(stderr, "ERROR: failed to parse %s\n", config_path);
            return 1;
        }
    }

    snprintf(cfg.workdir, sizeof(cfg.workdir), "%s", workdir);

    /* Read status to get n_layers if needed */
    if (cfg.n_layers == 0) {
        ft_status st = ft_status_read(&cfg);
        cfg.n_layers = st.n_layers;
    }

    fprintf(stderr, "ternarize-merge\n");
    fprintf(stderr, "  Workdir: %s\n", workdir);
    fprintf(stderr, "  Output: %s\n", output);
    fprintf(stderr, "  Layers: %d\n", cfg.n_layers);

    if (!ft_merge(&cfg, output)) {
        fprintf(stderr, "ERROR: merge failed\n");
        return 1;
    }

    return 0;
}