#include "models.h"

llm_build_bitnet::llm_build_bitnet(const llama_model & model, const llm_graph_params & params) : llm_graph_context(params) {

    const int64_t n_embd_head = hparams.n_embd_head_v;

    GGML_ASSERT(n_embd_head == hparams.n_embd_head_k);

    ggml_tensor * cur;

    ggml_tensor * inpL;

    inpL = build_inp_embd(model.tok_embd);

    // inp_pos - contains the positions

    ggml_tensor * inp_pos = build_inp_pos();

    auto * inp_attn = build_attn_inp_kv();

    ggml_tensor * inp_out_ids = build_inp_out_ids();

    for (int il = 0; il < n_layer; ++il) {

        ggml_tensor * inpSA = inpL;

        cur = build_norm(inpL,

                model.layers[il].attn_norm, NULL,

                LLM_NORM_RMS, il);

        cb(cur, "attn_norm", il);

        // self-attention

        {

            // compute Q and K and RoPE them

            ggml_tensor * Qcur = build_lora_mm(model.layers[il].wq, cur);

            if (model.layers[il].wq_scale) {

                Qcur = ggml_mul(ctx0, Qcur, model.layers[il].wq_scale);

            }

            cb(Qcur, "Qcur", il);

            if (model.layers[il].bq) {

                Qcur = ggml_add(ctx0, Qcur, model.layers[il].bq);

                cb(Qcur, "Qcur", il);

            }

            // B1.K

            ggml_tensor * Kcur = build_lora_mm(model.layers[il].wk, cur);

            if (model.layers[il].wk_scale) {

                Kcur = ggml_mul(ctx0, Kcur, model.layers[il].wk_scale);

            }

            cb(Kcur, "Kcur", il);

            if (model.layers[il].bk) {

                Kcur = ggml_add(ctx0, Kcur, model.layers[il].bk);

                cb(Kcur, "Kcur", il);

            }

            // B1.V

            ggml_tensor * Vcur = build_lora_mm(model.layers[il].wv, cur);

            if (model.layers[il].wv_scale) {

                Vcur = ggml_mul(ctx0, Vcur, model.layers[il].wv_scale);

            }

            cb(Vcur, "Vcur", il);

            if (model.layers[il].bv) {

                Vcur = ggml_add(ctx0, Vcur, model.layers[il].bv);

                cb(Vcur, "Vcur", il);

            }

            Qcur = ggml_reshape_3d(ctx0, Qcur, n_embd_head, n_head,    n_tokens);

            Kcur = ggml_reshape_3d(ctx0, Kcur, n_embd_head, n_head_kv, n_tokens);

            Vcur = ggml_reshape_3d(ctx0, Vcur, n_embd_head, n_head_kv, n_tokens);

            Qcur = ggml_rope_ext(

                    ctx0, Qcur, inp_pos, nullptr,

                    n_rot, rope_type, n_ctx_orig, freq_base, freq_scale,

                    ext_factor, attn_factor, beta_fast, beta_slow

                    );

            Kcur = ggml_rope_ext(

                    ctx0, Kcur, inp_pos, nullptr,

                    n_rot, rope_type, n_ctx_orig, freq_base, freq_scale,

                    ext_factor, attn_factor, beta_fast, beta_slow

                    );

            cb(Qcur, "Qcur", il);

            cb(Kcur, "Kcur", il);

            cb(Vcur, "Vcur", il);

            cur = build_attn(inp_attn,

                    NULL, NULL,

                    Qcur, Kcur, Vcur, nullptr, nullptr, nullptr, 1.0f/sqrtf(float(n_embd_head)), il);

            cur = build_norm(cur,

                    model.layers[il].attn_sub_norm, NULL,

                    LLM_NORM_RMS, il);

            cb(cur, "attn_sub_norm", il);

            cur = build_lora_mm(model.layers[il].wo, cur);

            if (model.layers[il].wo_scale) {

                cur = ggml_mul(ctx0, cur, model.layers[il].wo_scale);

            }

            if (model.layers[il].bo) {

                cur = ggml_add(ctx0, cur, model.layers[il].bo);

            }

            cb(cur, "attn_out", il);

        }

        if (il == n_layer - 1 && inp_out_ids) {

            cur   = ggml_get_rows(ctx0,   cur, inp_out_ids);

            inpSA = ggml_get_rows(ctx0, inpSA, inp_out_ids);

        }

        ggml_tensor * ffn_inp = ggml_add(ctx0, cur, inpSA);

        cb(ffn_inp, "ffn_inp", il);

        // feed-forward forward

        cur = build_norm(ffn_inp,

                model.layers[il].ffn_norm, NULL,

                LLM_NORM_RMS, il);

        cb(cur, "ffn_norm", il);

        cur = build_ffn(cur,

                model.layers[il].ffn_up,   NULL, model.layers[il].ffn_up_scale,

                model.layers[il].ffn_gate, NULL, model.layers[il].ffn_gate_scale,

                NULL,                      NULL, NULL,

                NULL,

                LLM_FFN_SILU, LLM_FFN_PAR, il);

        cb(cur, "ffn_sub_out", il);

        cur = build_norm(cur,

                model.layers[il].ffn_sub_norm, NULL,

                LLM_NORM_RMS, il);

        cb(cur, "ffn_sub_norm", il);

        cur = build_lora_mm(model.layers[il].ffn_down, cur);

        if (model.layers[il].ffn_down_scale) {

            cur = ggml_mul(ctx0, cur, model.layers[il].ffn_down_scale);

        }

        cb(cur, "ffn_down", il);

        cur = ggml_add(ctx0, cur, ffn_inp);

        cb(cur, "l_out", il);

        // input for next layer

        inpL = cur;

    }

    cur = inpL;

    cur = build_norm(cur,

            model.output_norm, NULL,

            LLM_NORM_RMS, -1);

    cb(cur, "result_norm", -1);

    res->t_embd = cur;

    // lm_head

    // FIXME: do not use model.tok_embd directly, duplicate as model.output

    cur = build_lora_mm(model.tok_embd, cur);

    cb(cur, "result_output", -1);

    res->t_logits = cur;

    ggml_build_forward_expand(gf, cur);

}