#include "models.h"

llm_build_llama_iswa::llm_build_llama_iswa(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_ASSERT(n_embd_head == hparams.n_rot);

    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();

    // temperature tuning

    ggml_tensor * inp_attn_scale = nullptr;

    inp_attn_scale = build_inp_attn_scale();

    auto * inp_attn = build_attn_inp_kv_iswa();

    const float kq_scale = hparams.f_attention_scale == 0.0f ? 1.0f/sqrtf(float(n_embd_head)) : hparams.f_attention_scale;

    ggml_tensor * inp_out_ids = build_inp_out_ids();

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

        const float freq_base_l  = model.get_rope_freq_base (cparams, il);

        const float freq_scale_l = model.get_rope_freq_scale(cparams, il);

        ggml_tensor * inpSA = inpL;

        // This overlaps with SWA layers in current models, so get_rope_freq_base/scale may be superfluous

        const bool use_rope = hparams.n_no_rope_layer_step > 0 &&

                              (il + 1) % hparams.n_no_rope_layer_step != 0;

        // norm

        cur = build_norm(inpL,

                model.layers[il].attn_norm, NULL,

                LLM_NORM_RMS, il);

        cb(cur, "attn_norm", il);

        // self-attention

        {

            // rope freq factors for llama3; may return nullptr for llama2 and other models

            ggml_tensor * rope_factors = model.get_rope_factors(cparams, il);

            // compute Q and K and RoPE them

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

            cb(Qcur, "Qcur", il);

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

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

                cb(Qcur, "Qcur", il);

            }

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

            cb(Kcur, "Kcur", il);

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

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

                cb(Kcur, "Kcur", il);

            }

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

            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);

            if (use_rope) {

                Qcur = ggml_rope_ext(

                        ctx0, Qcur, inp_pos, rope_factors,

                        n_rot, rope_type, n_ctx_orig, freq_base_l, freq_scale_l,

                        ext_factor, attn_factor, beta_fast, beta_slow

                        );

                Kcur = ggml_rope_ext(

                        ctx0, Kcur, inp_pos, rope_factors,

                        n_rot, rope_type, n_ctx_orig, freq_base_l, freq_scale_l,

                        ext_factor, attn_factor, beta_fast, beta_slow

                        );

            } else if (inp_attn_scale) {

                Qcur = ggml_mul(ctx0, Qcur, inp_attn_scale);

            }

            cb(Qcur, "Qcur", il);

            cb(Kcur, "Kcur", il);

            cb(Vcur, "Vcur", il);

            if (use_rope && hparams.use_kq_norm) {

                // Llama4TextL2Norm

                Qcur = ggml_rms_norm(ctx0, Qcur, hparams.f_norm_rms_eps);

                Kcur = ggml_rms_norm(ctx0, Kcur, hparams.f_norm_rms_eps);

                cb(Qcur, "Qcur_normed", il);

                cb(Kcur, "Kcur_normed", il);

            }

            cur = build_attn(inp_attn,

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

                    Qcur, Kcur, Vcur, nullptr, nullptr, nullptr, kq_scale, il);

            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 network (non-MoE)

        if (model.layers[il].ffn_gate_inp == nullptr) {

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

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

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

                    NULL,

                    LLM_FFN_SILU, LLM_FFN_PAR, il);

            cb(cur, "ffn_out", il);

        } else {

            ggml_tensor * ffn_inp_normed = build_norm(ffn_inp,

                    model.layers[il].ffn_norm, NULL,

                    LLM_NORM_RMS, il);

            cb(cur, "ffn_norm", il);

            ggml_tensor * moe_out = build_moe_ffn(ffn_inp_normed,

                    model.layers[il].ffn_gate_inp,

                    model.layers[il].ffn_up_exps,

                    model.layers[il].ffn_gate_exps,

                    model.layers[il].ffn_down_exps,

                    nullptr,

                    n_expert, n_expert_used,

                    LLM_FFN_SILU, false,

                    false, 0.0,

                    LLAMA_EXPERT_GATING_FUNC_TYPE_SIGMOID,

                    il);

            // Shared experts

            ggml_tensor * shexp_out = build_ffn(ffn_inp_normed,

                model.layers[il].ffn_up_shexp,   NULL, NULL,

                model.layers[il].ffn_gate_shexp, NULL, NULL,

                model.layers[il].ffn_down_shexp, NULL, NULL,

                NULL,

                LLM_FFN_SILU, LLM_FFN_PAR, il);

            cb(shexp_out, "ffn_moe_shexp", il);

            cur = ggml_add(ctx0, moe_out, shexp_out);

            cb(cur, "ffn_moe_out_merged", il);

        }

        cur = ggml_add(ctx0, cur, ffn_inp);

        cb(cur, "ffn_out", il);

        cur = build_cvec(cur, il);

        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

    cur = build_lora_mm(model.output, cur);

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

    res->t_logits = cur;

    ggml_build_forward_expand(gf, cur);

}