// Various helper functions and utilities

#pragma once

#include "llama.h"

#include "sampling.h"

#define LOG_NO_FILE_LINE_FUNCTION
#include "log.h"

#include <cmath>
#include <string>
#include <vector>
#include <random>
#include <thread>
#include <unordered_map>
#include <tuple>

#ifdef _WIN32
#define DIRECTORY_SEPARATOR '\\'
#else
#define DIRECTORY_SEPARATOR '/'
#endif // _WIN32

#define die(msg)          do { fputs("error: " msg "\n", stderr);                exit(1); } while (0)
#define die_fmt(fmt, ...) do { fprintf(stderr, "error: " fmt "\n", __VA_ARGS__); exit(1); } while (0)

#define print_build_info() do {                                                                     \
    fprintf(stderr, "%s: build = %d (%s)\n",      __func__, LLAMA_BUILD_NUMBER, LLAMA_COMMIT);      \
    fprintf(stderr, "%s: built with %s for %s\n", __func__, LLAMA_COMPILER, LLAMA_BUILD_TARGET);    \
} while(0)

#define DEFAULT_MODEL_PATH "models/7B/ggml-model-f16.gguf"

// build info
extern int LLAMA_BUILD_NUMBER;
extern char const * LLAMA_COMMIT;
extern char const * LLAMA_COMPILER;
extern char const * LLAMA_BUILD_TARGET;

struct llama_control_vector_load_info;

//
// CPU utils
//

int32_t cpu_get_num_physical_cores();
int32_t cpu_get_num_math();

//
// CLI argument parsing
//

struct gpt_params {
    uint32_t seed                 = LLAMA_DEFAULT_SEED; // RNG seed

    int32_t n_threads             = cpu_get_num_math();
    int32_t n_threads_draft       = -1;
    int32_t n_threads_batch       = -1;    // number of threads to use for batch processing (-1 = use n_threads)
    int32_t n_threads_batch_draft = -1;
    int32_t n_predict             = -1;    // new tokens to predict
    int32_t n_ctx                 = 512;   // context size
    int32_t n_batch               = 2048;  // logical batch size for prompt processing (must be >=32 to use BLAS)
    int32_t n_ubatch              = 512;   // physical batch size for prompt processing (must be >=32 to use BLAS)
    int32_t n_keep                = 0;     // number of tokens to keep from initial prompt
    int32_t n_draft               = 5;     // number of tokens to draft during speculative decoding
    int32_t n_chunks              = -1;    // max number of chunks to process (-1 = unlimited)
    int32_t n_parallel            = 1;     // number of parallel sequences to decode
    int32_t n_sequences           = 1;     // number of sequences to decode
    float   p_split               = 0.1f;  // speculative decoding split probability
    int32_t n_gpu_layers          = -1;    // number of layers to store in VRAM (-1 - use default)
    int32_t n_gpu_layers_draft    = -1;    // number of layers to store in VRAM for the draft model (-1 - use default)
    llama_split_mode split_mode   = LLAMA_SPLIT_MODE_LAYER; // how to split the model across GPUs
    int32_t main_gpu              = 0;     // the GPU that is used for scratch and small tensors
    float   tensor_split[128]     = {0};   // how split tensors should be distributed across GPUs
    int32_t n_beams               = 0;     // if non-zero then use beam search of given width.
    int32_t grp_attn_n            = 1;     // group-attention factor
    int32_t grp_attn_w            = 512;   // group-attention width
    int32_t n_print               = -1;    // print token count every n tokens (-1 = disabled)
    float   rope_freq_base        = 0.0f;  // RoPE base frequency
    float   rope_freq_scale       = 0.0f;  // RoPE frequency scaling factor
    float   yarn_ext_factor       = -1.0f; // YaRN extrapolation mix factor
    float   yarn_attn_factor      = 1.0f;  // YaRN magnitude scaling factor
    float   yarn_beta_fast        = 32.0f; // YaRN low correction dim
    float   yarn_beta_slow        = 1.0f;  // YaRN high correction dim
    int32_t yarn_orig_ctx         = 0;     // YaRN original context length
    float   defrag_thold          = -1.0f; // KV cache defragmentation threshold
    std::string rpc_servers       = "";    // comma separated list of RPC servers

    ggml_backend_sched_eval_callback cb_eval = nullptr;
    void * cb_eval_user_data                 = nullptr;

    ggml_numa_strategy numa = GGML_NUMA_STRATEGY_DISABLED;

    enum llama_rope_scaling_type rope_scaling_type = LLAMA_ROPE_SCALING_TYPE_UNSPECIFIED;
    enum llama_pooling_type      pooling_type      = LLAMA_POOLING_TYPE_UNSPECIFIED; // pooling type for embeddings

    // // sampling parameters
    struct llama_sampling_params sparams;

    std::string model                = "";  // model path
    std::string model_draft          = "";  // draft model for speculative decoding
    std::string model_alias          = "unknown"; // model alias
    std::string model_url            = "";  // model url to download
    std::string hf_repo              = "";  // HF repo
    std::string hf_file              = "";  // HF file
    std::string prompt               = "";
    std::string prompt_file          = "";  // store the external prompt file name
    std::string path_prompt_cache    = "";  // path to file for saving/loading prompt eval state
    std::string input_prefix         = "";  // string to prefix user inputs with
    std::string input_suffix         = "";  // string to suffix user inputs with
    std::vector<std::string> antiprompt; // string upon seeing which more user input is prompted
    std::string logdir               = "";  // directory in which to save YAML log files
    std::string lookup_cache_static  = ""; // path of static ngram cache file for lookup decoding
    std::string lookup_cache_dynamic = ""; // path of dynamic ngram cache file for lookup decoding
    std::string logits_file          = "";  // file for saving *all* logits

    std::vector<llama_model_kv_override> kv_overrides;

    // TODO: avoid tuple, use struct
    std::vector<std::tuple<std::string, float>> lora_adapter; // lora adapter path with user defined scale
    std::string lora_base  = "";                              // base model path for the lora adapter

    std::vector<llama_control_vector_load_info> control_vectors; // control vector with user defined scale

    int32_t control_vector_layer_start = -1; // layer range for control vector
    int32_t control_vector_layer_end   = -1; // layer range for control vector

    int  ppl_stride        = 0;     // stride for perplexity calculations. If left at 0, the pre-existing approach will be used.
    int  ppl_output_type   = 0;     // = 0 -> ppl output is as usual, = 1 -> ppl output is num_tokens, ppl, one per line
                                    //                                       (which is more convenient to use for plotting)
                                    //
    bool   hellaswag       = false; // compute HellaSwag score over random tasks from datafile supplied in prompt
    size_t hellaswag_tasks = 400;   // number of tasks to use when computing the HellaSwag score

    bool   winogrande      = false; // compute Winogrande score over random tasks from datafile supplied in prompt
    size_t winogrande_tasks= 0;     // number of tasks to use when computing the Winogrande score. If 0, all tasks will be computed

    bool   multiple_choice = false; // compute TruthfulQA score over random tasks from datafile supplied in prompt
    size_t multiple_choice_tasks = 0;     // number of tasks to use when computing the TruthfulQA score. If 0, all tasks will be computed

    bool   kl_divergence   = false; // compute KL divergence

    bool random_prompt     = false; // do not randomize prompt if none provided
    bool use_color         = false; // use color to distinguish generations and inputs
    bool interactive       = false; // interactive mode
    bool interactive_specials = false; // whether to allow special tokens from user, during interactive mode
    bool special           = false; // enable special token output
    bool conversation      = false; // conversation mode (does not print special tokens and suffix/prefix)
    bool chatml            = false; // chatml mode (used for models trained on chatml syntax)
    bool prompt_cache_all  = false; // save user input and generations to prompt cache
    bool prompt_cache_ro   = false; // open the prompt cache read-only and do not update it

    bool embedding         = false; // get only sentence embedding
    bool escape            = false; // escape "\n", "\r", "\t", "\'", "\"", and "\\"
    bool interactive_first = false; // wait for user input immediately
    bool multiline_input   = false; // reverse the usage of `\`
    bool simple_io         = false; // improves compatibility with subprocesses and limited consoles
    bool cont_batching     = true;  // insert new sequences for decoding on-the-fly
    bool flash_attn        = false; // flash attention

    bool input_prefix_bos  = false; // prefix BOS to user inputs, preceding input_prefix
    bool ignore_eos        = false; // ignore generated EOS tokens
    bool instruct          = false; // instruction mode (used for Alpaca models)
    bool logits_all        = false; // return logits for all tokens in the batch
    bool use_mmap          = true;  // use mmap for faster loads
    bool use_mlock         = false; // use mlock to keep model in memory
    bool verbose_prompt    = false; // print prompt tokens before generation
    bool display_prompt    = true;  // print prompt before generation
    bool infill            = false; // use infill mode
    bool dump_kv_cache     = false; // dump the KV cache contents for debugging purposes
    bool no_kv_offload     = false; // disable KV offloading
    bool warmup            = true;  // warmup run
    bool check_tensors     = false; // validate tensor data

    std::string cache_type_k = "f16"; // KV cache data type for the K
    std::string cache_type_v = "f16"; // KV cache data type for the V

    // multimodal models (see examples/llava)
    std::string mmproj = "";        // path to multimodal projector
    std::vector<std::string> image; // path to image file(s)
};

void gpt_params_handle_model_default(gpt_params & params);

bool gpt_params_parse_ex   (int argc, char ** argv, gpt_params & params);
bool gpt_params_parse      (int argc, char ** argv, gpt_params & params);
bool gpt_params_find_arg   (int argc, char ** argv, const std::string & arg, gpt_params & params, int & i, bool & invalid_param);
void gpt_params_print_usage(int argc, char ** argv, const gpt_params & params);

std::string gpt_params_get_system_info(const gpt_params & params);

//
// String utils
//

std::vector<std::string> string_split(std::string input, char separator);

std::string string_strip(const std::string & str);
std::string string_get_sortable_timestamp();
std::string string_random_prompt(std::mt19937 & rng);

bool string_parse_kv_override(const char * data, std::vector<llama_model_kv_override> & overrides);
void string_process_escapes(std::string & input);

//
// Filesystem utils
//

bool fs_validate_filename(const std::string & filename);
bool fs_create_directory_with_parents(const std::string & path);

std::string fs_get_cache_directory();

//
// Model utils
//

// TODO: avoid tuplue, use struct
std::tuple<struct llama_model *, struct llama_context *> llama_init_from_gpt_params(gpt_params & params);

struct llama_model_params   llama_model_params_from_gpt_params  (const gpt_params & params);
struct llama_context_params llama_context_params_from_gpt_params(const gpt_params & params);

struct llama_model * llama_load_model_from_url(const char * model_url, const char * path_model, const struct llama_model_params & params);
struct llama_model * llama_load_model_from_hf(const char * repo, const char * file, const char * path_model, const struct llama_model_params & params);

// Batch utils

void llama_batch_clear(struct llama_batch & batch);

void llama_batch_add(
                 struct llama_batch & batch,
                        llama_token   id,
                          llama_pos   pos,
    const std::vector<llama_seq_id> & seq_ids,
                               bool   logits);

//
// Vocab utils
//

// tokenizes a string into a vector of tokens
// should work similar to Python's `tokenizer.encode`
std::vector<llama_token> llama_tokenize(
  const struct llama_context * ctx,
           const std::string & text,
                        bool   add_special,
                        bool   parse_special = false);

std::vector<llama_token> llama_tokenize(
    const struct llama_model * model,
           const std::string & text,
                        bool   add_special,
                        bool   parse_special = false);

// tokenizes a token into a piece, optionally renders special/control tokens
// should work similar to Python's `tokenizer.id_to_piece`
std::string llama_token_to_piece(
        const struct llama_context * ctx,
                       llama_token   token,
                       bool          special = true);

// TODO: these should be moved in llama.h C-style API under single `llama_detokenize` function
//       that takes into account the tokenizer type and decides how to handle the leading space
//
// detokenizes a vector of tokens into a string
// should work similar to Python's `tokenizer.decode`
// removes the leading space from the first non-BOS token
std::string llama_detokenize_spm(
                         llama_context * ctx,
        const std::vector<llama_token> & tokens);

// detokenizes a vector of tokens into a string
// should work similar to Python's `tokenizer.decode`
std::string llama_detokenize_bpe(
                         llama_context * ctx,
        const std::vector<llama_token> & tokens);

// Uses the value from the model metadata if possible, otherwise
// defaults to true when model type is SPM, otherwise false.
bool llama_should_add_bos_token(const llama_model * model);

//
// KV cache utils
//

// Dump the KV cache view with the number of sequences per cell.
void llama_kv_cache_dump_view(const llama_kv_cache_view & view, int row_size = 80);

// Dump the KV cache view showing individual sequences in each cell (long output).
void llama_kv_cache_dump_view_seqs(const llama_kv_cache_view & view, int row_size = 40);

//
// Embedding utils
//

void llama_embd_normalize(const float * inp, float * out, int n);

float llama_embd_similarity_cos(const float * embd1, const float * embd2, int n);

//
// Control vector utils
//

struct llama_control_vector_data {
    int n_embd;

    // stores data for layers [1, n_layer] where n_layer = data.size() / n_embd
    std::vector<float> data;
};

struct llama_control_vector_load_info {
    float strength;

    std::string fname;
};

// Load control vectors, scale each by strength, and add them together.
// On error, returns {-1, empty}
llama_control_vector_data llama_control_vector_load(const std::vector<llama_control_vector_load_info> & load_infos);

//
// Split utils
//

static const char * const LLM_KV_SPLIT_NO            = "split.no";
static const char * const LLM_KV_SPLIT_COUNT         = "split.count";
static const char * const LLM_KV_SPLIT_TENSORS_COUNT = "split.tensors.count";

//
// YAML utils
//

void yaml_dump_vector_float    (FILE * stream, const char * prop_name, const std::vector<float> & data);
void yaml_dump_vector_int      (FILE * stream, const char * prop_name, const std::vector<int> & data);
void yaml_dump_string_multiline(FILE * stream, const char * prop_name, const char * data);

void yaml_dump_non_result_info(
    FILE * stream, const gpt_params & params, const llama_context * lctx,
    const std::string & timestamp, const std::vector<int> & prompt_tokens, const char * model_desc);

