#include "ggml.h"
#include "llama.h"
#include "build-info.h"

#include <cstdio>
#include <map>
#include <string>

static const std::map<std::string, llama_ftype> LLAMA_FTYPE_MAP = {
    {"q4_0", LLAMA_FTYPE_MOSTLY_Q4_0},
    {"q4_1", LLAMA_FTYPE_MOSTLY_Q4_1},
    {"q4_2", LLAMA_FTYPE_MOSTLY_Q4_2},
    {"q5_0", LLAMA_FTYPE_MOSTLY_Q5_0},
    {"q5_1", LLAMA_FTYPE_MOSTLY_Q5_1},
    {"q8_0", LLAMA_FTYPE_MOSTLY_Q8_0},
};

bool try_parse_ftype(const std::string & ftype_str, llama_ftype & ftype, std::string & ftype_str_out) {
    auto it = LLAMA_FTYPE_MAP.find(ftype_str);
    if (it != LLAMA_FTYPE_MAP.end()) {
        ftype = it->second;
        ftype_str_out = it->first;
        return true;
    }
    // try to parse as an integer
    try {
        int ftype_int = std::stoi(ftype_str);
        for (auto it = LLAMA_FTYPE_MAP.begin(); it != LLAMA_FTYPE_MAP.end(); it++) {
            if (it->second == ftype_int) {
                ftype = it->second;
                ftype_str_out = it->first;
                return true;
            }
        }
    }
    catch (...) {
        // stoi failed
    }
    return false;
}

// usage:
//  ./quantize models/llama/ggml-model.bin [models/llama/ggml-model-quant.bin] type [nthreads]
//
int main(int argc, char ** argv) {
    ggml_time_init();

    if (argc < 3) {
        fprintf(stderr, "usage: %s model-f32.bin [model-quant.bin] type [nthreads]\n", argv[0]);
        for (auto it = LLAMA_FTYPE_MAP.begin(); it != LLAMA_FTYPE_MAP.end(); it++) {
            fprintf(stderr, "  type = \"%s\" or %d\n", it->first.c_str(), it->second);
        }
        return 1;
    }

    // needed to initialize f16 tables
    {
        struct ggml_init_params params = { 0, NULL, false };
        struct ggml_context * ctx = ggml_init(params);
        ggml_free(ctx);
    }

    // parse command line arguments
    const std::string fname_inp = argv[1];
    std::string fname_out;
    int nthread;
    llama_ftype ftype;

    int arg_idx = 2;
    std::string ftype_str;
    if (try_parse_ftype(argv[arg_idx], ftype, ftype_str)) {
        // argv[2] is the ftype
        std::string fpath;
        const size_t pos = fname_inp.find_last_of('/');
        if (pos != std::string::npos) {
            fpath = fname_inp.substr(0, pos + 1);
        }
        // export as [inp path]/ggml-model-[ftype].bin
        fname_out = fpath + "ggml-model-" + ftype_str + ".bin";
        arg_idx++;
    }
    else {
        // argv[2] is the output path
        fname_out = argv[arg_idx];
        arg_idx++;

        if (argc <= arg_idx) {
            fprintf(stderr, "%s: missing ftype\n", __func__);
            return 1;
        }
        // argv[3] is the ftype
        if (!try_parse_ftype(argv[arg_idx], ftype, ftype_str)) {
            fprintf(stderr, "%s: invalid ftype '%s'\n", __func__, argv[3]);
            return 1;
        }
        arg_idx++;
    }

    // parse nthreads
    if (argc > arg_idx) {
        try {
            nthread = std::stoi(argv[arg_idx]);
        }
        catch (const std::exception & e) {
            fprintf(stderr, "%s: invalid nthread '%s' (%s)\n", __func__, argv[arg_idx], e.what());
            return 1;
        }
    } else {
        nthread = 0;
    }

    fprintf(stderr, "%s: build = %d (%s)\n", __func__, BUILD_NUMBER, BUILD_COMMIT);

    fprintf(stderr, "%s: quantizing '%s' to '%s' as %s", __func__, fname_inp.c_str(), fname_out.c_str(), ftype_str.c_str());
    if (nthread > 0) {
        fprintf(stderr, " using %d threads", nthread);
    }
    fprintf(stderr, "\n");

    const int64_t t_main_start_us = ggml_time_us();

    int64_t t_quantize_us = 0;

    // load the model
    {
        const int64_t t_start_us = ggml_time_us();

        if (llama_model_quantize(fname_inp.c_str(), fname_out.c_str(), ftype, nthread)) {
            fprintf(stderr, "%s: failed to quantize model from '%s'\n", __func__, fname_inp.c_str());
            return 1;
        }

        t_quantize_us = ggml_time_us() - t_start_us;
    }

    // report timing
    {
        const int64_t t_main_end_us = ggml_time_us();

        printf("\n");
        printf("%s: quantize time = %8.2f ms\n", __func__, t_quantize_us/1000.0);
        printf("%s:    total time = %8.2f ms\n", __func__, (t_main_end_us - t_main_start_us)/1000.0);
    }

    return 0;
}