#include "models.h"

llm_build_phi2::llm_build_phi2(const llama_model & model, const llm_graph_params & params) : llm_graph_context(params) {

    const int64_t n_embd_head = hparams.n_embd_head_v;

    const int64_t n_embd_gqa  = hparams.n_embd_v_gqa();

    GGML_ASSERT(n_embd_head == hparams.n_embd_head_k);

    ggml_tensor * cur;

    ggml_tensor * attn_norm_output;

    ggml_tensor * ffn_output;

    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) {

        attn_norm_output = build_norm(inpL,

                model.layers[il].attn_norm,

                model.layers[il].attn_norm_b,

                LLM_NORM, il);

        cb(attn_norm_output, "attn_norm", il);

        // self-attention

        {

            ggml_tensor * Qcur = nullptr;

            ggml_tensor * Kcur = nullptr;

            ggml_tensor * Vcur = nullptr;

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

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

                cb(cur, "wqkv", il);

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

                cb(cur, "bqkv", il);

                Qcur = ggml_view_3d(ctx0, cur, n_embd_head, n_head,    n_tokens, n_embd_head*sizeof(float), cur->nb[1], 0*sizeof(float)*(n_embd));

                Kcur = ggml_view_3d(ctx0, cur, n_embd_head, n_head_kv, n_tokens, n_embd_head*sizeof(float), cur->nb[1], 1*sizeof(float)*(n_embd));

                Vcur = ggml_view_3d(ctx0, cur, n_embd_head, n_head_kv, n_tokens, n_embd_head*sizeof(float), cur->nb[1], 1*sizeof(float)*(n_embd + n_embd_gqa));

            } else {

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

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

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

                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);

            // with phi2, we scale the Q to avoid precision issues

            // ref: https://github.com/ml-explore/mlx-examples/blob/08e862336ade809bc37d1035f94b359e7d1a5152/phi2/phi2.py#L64-L66

            Qcur = ggml_scale(ctx0, Qcur, 1.0f/sqrtf(float(n_embd_head)));

            cur = build_attn(inp_attn,

                    model.layers[il].wo, model.layers[il].bo,

                    Qcur, Kcur, Vcur, nullptr, nullptr, nullptr, 1.0f, il);

        }

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

            cur              = ggml_get_rows(ctx0,              cur, inp_out_ids);

            inpL             = ggml_get_rows(ctx0,             inpL, inp_out_ids);

            attn_norm_output = ggml_get_rows(ctx0, attn_norm_output, inp_out_ids);

        }

        // FF

        {

            ffn_output = build_ffn(attn_norm_output,

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

                    NULL,                      NULL,                        NULL,

                    model.layers[il].ffn_down, model.layers[il].ffn_down_b, NULL,

                    NULL,

                    LLM_FFN_GELU, LLM_FFN_SEQ, il);

            cb(ffn_output, "ffn_out", il);

        }

        cur = ggml_add(ctx0, cur, ffn_output);

        cur = ggml_add(ctx0, cur, inpL);

        cur = build_cvec(cur, il);

        cb(cur, "l_out", il);

        // input for next layer

        inpL = cur;

    }

    cur = build_norm(inpL,

            model.output_norm,

            model.output_norm_b,

            LLM_NORM, -1);

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

    res->t_embd = cur;

    cur = build_lora_mm(model.output, cur);

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

    cur = ggml_add(ctx0, cur, model.output_b);

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

    res->t_logits = cur;

    ggml_build_forward_expand(gf, cur);

}