#include "models.h"

#include "llama-memory-recurrent.h"

// Causal Conv1d function for Q,K,V

// When qkv is 0, it is Q, 1 is K, 2 is V

static ggml_tensor * causal_conv1d(ggml_cgraph * gf, ggml_context * ctx0, ggml_tensor * conv_states_all, ggml_tensor * conv_state_all, int64_t qkv, ggml_tensor * x, ggml_tensor * proj_w, ggml_tensor * conv_w, int64_t d_conv, int64_t head_dim, int64_t n_head, int64_t n_seq_tokens, int64_t n_seqs, int64_t n_tokens, int64_t kv_head) {

    const int64_t d_inner = head_dim * n_head;

    const int64_t conv_state_size = (d_conv - 1) * d_inner;

    const int64_t n_embd_r_total = 3 * conv_state_size;  // Q + K + V

    // conv_state_all is [n_embd_r_total, n_seqs], split into Q, K, V

    // Each conv state is [(d_conv-1) * d_inner] per sequence, need to reshape to [d_conv-1, d_inner, n_seqs]

    // Memory layout: for each seq, Q state is first conv_state_size elements, then K, then V

    // conv_state_all has stride: nb[0] = element_size, nb[1] = n_embd_r_total * element_size

    // View Q conv state: offset 0, size conv_state_size per seq

    // conv_state_all is [n_embd_r_total, n_seqs] with memory layout:

    //   state[i + seq * n_embd_r_total] where i = conv_step + channel * (d_conv-1) + {0, conv_state_size, 2*conv_state_size} for Q/K/V

    // We want [d_conv-1, d_inner, n_seqs] view:

    //   nb1 = (d_conv-1) * element_size (stride between channels)

    //   nb2 = n_embd_r_total * element_size (stride between seqs)

    ggml_tensor * conv_state_x = ggml_view_3d(ctx0, conv_state_all, d_conv - 1, d_inner, n_seqs,

        (d_conv - 1) * ggml_element_size(conv_state_all),  // nb1: stride between channels

        n_embd_r_total * ggml_element_size(conv_state_all),  // nb2: stride between seqs

        qkv * conv_state_size * ggml_element_size(conv_state_all));

// Causal Conv1d function for Q,K,V

// When qkv is 0, it is Q, 1 is K, 2 is V

    // Step 1: Q, K, V projections -> [d_inner, n_tokens]

    ggml_tensor * x_proj = ggml_mul_mat(ctx0, proj_w, x);

    // Reshape input: {d_inner, n_tokens} -> {d_inner, n_seq_tokens, n_seqs}

    ggml_tensor * x_3d = ggml_reshape_3d(ctx0, x_proj, d_inner, n_seq_tokens, n_seqs);

    // Concat Q conv state and current input: {d_conv-1 + n_seq_tokens, d_inner, n_seqs}

    ggml_tensor * conv_x = ggml_concat(ctx0, conv_state_x, ggml_transpose(ctx0, x_3d), 0);

    // Save last (d_conv-1) columns back to Q conv state

    ggml_tensor * last_conv_x = ggml_view_3d(ctx0, conv_x, d_conv - 1, d_inner, n_seqs,

        conv_x->nb[1], conv_x->nb[2], n_seq_tokens * conv_x->nb[0]);

    ggml_build_forward_expand(gf,

        ggml_cpy(ctx0, last_conv_x,

            ggml_view_3d(ctx0, conv_states_all,

                d_conv - 1, d_inner, n_seqs,

                (d_conv - 1) * ggml_element_size(conv_states_all),           // nb1: contiguous within one channel's conv taps

                n_embd_r_total * ggml_element_size(conv_states_all),         // nb2: stride between sequences (skip over K,V states)

                (kv_head * n_embd_r_total + qkv * conv_state_size) * ggml_element_size(conv_states_all))));  // offset to first seq's Q/K/V state

    // Reshape conv weight: GGUF [d_conv, 1, d_inner, 1] -> ggml_ssm_conv expects [d_conv, d_inner]

    // GGUF stores as [d_conv, 1, d_inner, 1] with memory layout w[conv_step + channel * d_conv]

    // vLLM stores as [d_inner, d_conv] with memory layout w[channel * d_conv + conv_step]

    // ggml_ssm_conv computes: c[conv_step + channel * d_conv]

    // GGUF layout: [d_conv, 1, d_inner] or [d_conv, 1, d_inner, 1] -> reshape to [d_conv, d_inner]

    // Reshape conv weight from [d_conv, 1, d_inner, 1] to [d_conv, d_inner] for ggml_ssm_conv

    ggml_tensor * conv_weight = ggml_reshape_2d(ctx0, conv_w, d_conv, d_inner);

    // Apply conv1d

    // ggml_ssm_conv output: {d_inner, n_seq_tokens, n_seqs}

    ggml_tensor * Xcur = ggml_ssm_conv(ctx0, conv_x, conv_weight);

    // Reshape to 2D for bias add: {d_inner, n_tokens}

    Xcur = ggml_reshape_2d(ctx0, Xcur, d_inner, n_tokens);

    Xcur = ggml_silu(ctx0, Xcur);

    return ggml_reshape_4d(ctx0, Xcur, head_dim, n_head, n_seq_tokens, n_seqs);

}

llm_build_kimi_linear::llm_build_kimi_linear(const llama_model & model, const llm_graph_params & params) :

    llm_build_delta_net_base(params), model(model) {

    ggml_tensor * cur;

    ggml_tensor * inpL;

    inpL = build_inp_embd(model.tok_embd);

    cb(inpL, "model.embed_tokens", -1);

    // Note: Kimi MLA does NOT use RoPE (rotary_emb=None in vLLM)

    // So we don't need inp_pos

    auto * inp_kv = !hparams.is_mla() ? build_inp_mem_hybrid() : nullptr;

    auto * inp_k = hparams.is_mla() ? build_inp_mem_hybrid_k() : nullptr;

    auto * inp_rs = hparams.is_mla() ? inp_k->get_recr() : inp_kv->get_recr();

    auto * inp_attn_kv = !hparams.is_mla() ? inp_kv->get_attn() : nullptr;

    auto * inp_attn_k = hparams.is_mla() ? inp_k->get_attn() : nullptr;

    // Output ids for selecting which tokens to output

    ggml_tensor * inp_out_ids = build_inp_out_ids();

    // Kimi dimension constants

    const int64_t n_head = hparams.n_head();

    const int64_t head_dim = hparams.n_embd_head_kda;

    const int64_t d_conv = hparams.ssm_d_conv;

    const int64_t d_inner = n_head * head_dim;  // 32 * 128 = 4096

    const int64_t n_seqs = ubatch.n_seqs;

    const int64_t n_seq_tokens = ubatch.n_seq_tokens;

    // Verify batch consistency for recurrent layers

    GGML_ASSERT(n_seqs != 0);

    GGML_ASSERT(ubatch.equal_seqs());

    GGML_ASSERT(ubatch.n_tokens == n_seq_tokens * n_seqs);

    // MLA params

    const int64_t n_embd_head_k_mla = hparams.n_embd_head_k_mla();

    const int64_t n_embd_head_v_mla = hparams.n_embd_head_v_mla();

    const int64_t kv_lora_rank = hparams.n_lora_kv;

    // qk_rope_head_dim = 64 (from Kimi config) which is hparams.n_rot

    // Confirmed from tensor shape: wkv_a_mqa [2304, 576] = [n_embd, kv_lora_rank + qk_rope_head_dim]

    const int64_t n_embd_head_qk_rope = hparams.n_rot();  // config.qk_rope_head_dim

    const int64_t n_embd_head_qk_nope = n_embd_head_k_mla - n_embd_head_qk_rope;  // 192 - 64 = 128

    // Attention scale for MLA

    const float kq_scale_mla = 1.0f / sqrtf((float)n_embd_head_k_mla);

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

        const auto & layer = model.layers[il];

        ggml_tensor * inpSA = inpL;

        // Attention Norm

        cur = build_norm(inpL, layer.attn_norm, NULL, LLM_NORM_RMS, il);

        cb(cur, "attn_norm", il);

        ggml_build_forward_expand(gf, cur);

        if (hparams.is_recurrent(il)) {

            // === KDA Layer (Kimi Delta Attention) with Recurrent State ===

            // Reference: vLLM kda.py

            const auto * mctx_cur = inp_rs->mctx;

            const auto kv_head = mctx_cur->get_head();

            // Get conv states from r_l tensor (Q, K, V each have separate state)

            ggml_tensor * conv_states_all = mctx_cur->get_r_l(il);

            cb(conv_states_all, "conv_states_all", il);

            ggml_tensor * conv_state_all = build_rs(inp_rs, conv_states_all, hparams.n_embd_r(), n_seqs);

            ggml_tensor * Qcur = causal_conv1d(gf, ctx0, conv_states_all, conv_state_all, 0, cur, layer.wq, layer.ssm_q_conv, d_conv, head_dim, n_head, n_seq_tokens, n_seqs, n_tokens, kv_head);

            ggml_tensor * Kcur = causal_conv1d(gf, ctx0, conv_states_all, conv_state_all, 1, cur, layer.wk, layer.ssm_k_conv, d_conv, head_dim, n_head, n_seq_tokens, n_seqs, n_tokens, kv_head);

            ggml_tensor * Vcur = causal_conv1d(gf, ctx0, conv_states_all, conv_state_all, 2, cur, layer.wv, layer.ssm_v_conv, d_conv, head_dim, n_head, n_seq_tokens, n_seqs, n_tokens, kv_head);

            // g1 = -exp(A_log) * softplus(f_b(f_a(x)) + dt_bias)

            ggml_tensor * f_a = ggml_mul_mat(ctx0, layer.ssm_f_a, cur);

            ggml_tensor * g1 = ggml_mul_mat(ctx0, layer.ssm_f_b, f_a);

            cb(g1, "g1 f_b(f_a(cur))", il);

            g1 = ggml_add(ctx0, g1, layer.ssm_dt_b);

            g1 = ggml_softplus(ctx0, g1);

            g1 = ggml_reshape_3d(ctx0, g1, head_dim, n_head, n_tokens);

            // A_log shape is [1, n_head] or [1, n_head, 1, 1], need to broadcast to [head_dim, n_head, n_tokens]. No need to -exp(a_log) because it was done in convert_hf_to_gguf.py

            // Reshape to [1, n_head, 1] for broadcasting with g1 [head_dim, n_head, n_tokens]

            ggml_tensor * A = ggml_reshape_3d(ctx0, layer.ssm_a, 1, n_head, 1);

            g1 = ggml_mul(ctx0, g1, A);

            cb(g1, "kda_g1", il);

            g1 = ggml_reshape_4d(ctx0, g1, head_dim, n_head, n_seq_tokens, n_seqs);

            // Compute beta (mixing coefficient)

            ggml_tensor * beta = ggml_mul_mat(ctx0, layer.ssm_beta, cur);

            beta = ggml_reshape_4d(ctx0, beta, 1, n_head, n_seq_tokens, n_seqs);

            cb(beta, "kda_beta", il);

            beta = ggml_sigmoid(ctx0, beta);

            // Reshape for KDA recurrence

            // {n_embd, n_tokens} -> {n_embd, n_seq_tokens, n_seqs}

            cur = ggml_reshape_3d(ctx0, cur, cur->ne[0], n_seq_tokens, n_seqs);

            // Get SSM state and compute KDA recurrence using ggml_kda_scan

            ggml_tensor * ssm_states_all = mctx_cur->get_s_l(il);

            ggml_tensor * state = build_rs(inp_rs, ssm_states_all, hparams.n_embd_s(), n_seqs);

            state = ggml_reshape_4d(ctx0, state, head_dim, head_dim, n_head, n_seqs);

            const float eps_norm = hparams.f_norm_rms_eps;

            Qcur = ggml_l2_norm(ctx0, Qcur, eps_norm);

            Kcur = ggml_l2_norm(ctx0, Kcur, eps_norm);

            // Choose between build_delta_net_chunking and build_delta_net_recurrent based on n_tokens

            auto attn_out = build_delta_net(Qcur, Kcur, Vcur, g1, beta, state, il);

            ggml_tensor * output = ggml_cont(ctx0, attn_out.first);

            ggml_tensor * new_state = attn_out.second;

            cb(output, "attn_output", il);

            cb(new_state, "new_state", il);

            // Update the recurrent states

            ggml_build_forward_expand(gf,

                                     ggml_cpy(ctx0, new_state,

                                              ggml_view_1d(ctx0, ssm_states_all, hparams.n_embd_s() * n_seqs,

                                                           kv_head * hparams.n_embd_s() * ggml_element_size(ssm_states_all))));

            // Output gating g2 = g_b(g_a(x))

            ggml_tensor * cur_2d = ggml_reshape_2d(ctx0, cur, cur->ne[0], n_seq_tokens * n_seqs);

            ggml_tensor * g_a = ggml_mul_mat(ctx0, layer.ssm_g_a, cur_2d);

            ggml_tensor * g2 = ggml_mul_mat(ctx0, layer.ssm_g_b, g_a);

            cb(g2, "g2 g_b(g_a(cur_2d))", il);

            g2 = ggml_reshape_3d(ctx0, g2, head_dim, n_head, n_seq_tokens * n_seqs);

            // Apply o_norm with sigmoid gating

            // Note: Kimi model uses sigmoid gating, not SiLU (despite FusedRMSNormGated default being swish)

            // Formula: output = RMSNorm(x) * sigmoid(g)

            ggml_tensor * attn_out_final = ggml_reshape_3d(ctx0, output, head_dim, n_head,  n_seq_tokens * n_seqs);

            ggml_tensor * normed = build_norm(attn_out_final, layer.ssm_o_norm, nullptr, LLM_NORM_RMS, il);

            cb(normed, "kda_normed", il);

            ggml_tensor * gate = ggml_sigmoid(ctx0, g2);

            ggml_tensor * gated = ggml_mul(ctx0, normed, gate);

            // Output projection

            gated = ggml_cont_2d(ctx0, gated, d_inner, n_tokens);

            cur = ggml_mul_mat(ctx0, layer.wo, gated);

            cb(cur, "kda_out", il);

        } else {

            // === MLA Layer (Multi-head Latent Attention) without KV Cache ===

            // Reference: vLLM mla.py

            // Step 1: Q projection and reshape

            // vLLM Kimi: q = q_proj(hidden_states), then view as [n_tokens, n_head, qk_head_dim]

            // Note: Kimi MLA does NOT use RoPE (rotary_emb=None in vLLM)

            ggml_tensor * Qcur = ggml_mul_mat(ctx0, layer.wq, cur);

            // Step 2: KV compression

            // kv_cmpr_pe = kv_a_proj_with_mqa(hidden_states) -> [kv_lora_rank + qk_rope_head_dim, n_tokens]

            ggml_tensor * kv_cmpr_pe = ggml_mul_mat(ctx0, layer.wkv_a_mqa, cur);

            // Split: kv_cmpr = kv_lora[:kv_lora_rank], k_pe = kv_lora[kv_lora_rank:]

            ggml_tensor * kv_cmpr = ggml_view_2d(ctx0, kv_cmpr_pe, kv_lora_rank, n_tokens,

                ggml_row_size(kv_cmpr_pe->type, kv_lora_rank + n_embd_head_qk_rope), 0);

            ggml_tensor * k_pe = ggml_view_3d(ctx0, kv_cmpr_pe, n_embd_head_qk_rope, 1, n_tokens,

                ggml_row_size(kv_cmpr_pe->type, kv_lora_rank + n_embd_head_qk_rope),

                ggml_row_size(kv_cmpr_pe->type, kv_lora_rank + n_embd_head_qk_rope),

                ggml_row_size(kv_cmpr_pe->type, kv_lora_rank));

            // Note: Kimi MLA does NOT apply RoPE (rotary_emb=None in vLLM)

            // k_pe is used directly without RoPE

            // Normalize kv_c

            kv_cmpr = build_norm(kv_cmpr, layer.attn_kv_a_norm, nullptr, LLM_NORM_RMS, il);

            if (layer.wk_b && layer.wv_b) { // MLA KV cache enabled

                // extract q_nope

                ggml_tensor * q_nope =

                    ggml_view_3d(ctx0, Qcur, n_embd_head_qk_nope, n_head, n_tokens, ggml_row_size(Qcur->type, n_embd_head_k_mla),

                                 ggml_row_size(Qcur->type, n_embd_head_k_mla) * n_head, 0);

                cb(q_nope, "q_nope", il);

                // and {n_embd_head_qk_rope, n_head, n_tokens}

                ggml_tensor * q_pe = ggml_view_3d(

                    ctx0, Qcur, n_embd_head_qk_rope, n_head, n_tokens, ggml_row_size(Qcur->type, n_embd_head_k_mla),

                    ggml_row_size(Qcur->type, n_embd_head_k_mla) * n_head, ggml_row_size(Qcur->type, n_embd_head_qk_nope));

                cb(q_pe, "q_pe", il);

                // {n_embd_head_qk_nope, n_tokens, n_head}

                q_nope = ggml_permute(ctx0, q_nope, 0, 2, 1, 3);

                cb(q_nope, "q_nope_perm", il);

                // {n_embd_head_qk_nope, kv_lora_rank, n_head} x {n_embd_head_qk_nope, n_tokens, n_head}

                ggml_tensor * q_nope_absorbed = ggml_mul_mat(ctx0, layer.wk_b, q_nope);

                cb(q_nope_absorbed, "q_nope_absorbed", il);

                // {kv_lora_rank, n_head, n_tokens}

                q_nope_absorbed = ggml_permute(ctx0, q_nope_absorbed, 0, 2, 1, 3);

                cb(q_nope_absorbed, "q_nope_absorbed_perm", il);

                // {n_embd_head_qk_rope + kv_lora_rank, n_head, n_tokens}

                // note: rope must go first for in-place context shifting in build_rope_shift()

                Qcur = ggml_concat(ctx0, q_nope_absorbed, q_pe, 0);

                cb(Qcur, "Qcur", il);

                kv_cmpr = ggml_reshape_3d(ctx0, kv_cmpr, kv_lora_rank, 1, n_tokens);

                cb(kv_cmpr, "kv_cmpr_reshape", il);

                // {n_embd_head_qk_rope + kv_lora_rank, 1, n_tokens}

                ggml_tensor * Kcur = ggml_concat(ctx0, kv_cmpr, k_pe, 0);

                cb(Kcur, "Kcur", il);

                // {kv_lora_rank, 1, n_tokens}

                ggml_tensor * Vcur = kv_cmpr;

                cb(Vcur, "Vcur", il);

                cur = build_attn(inp_attn_k, layer.wo, NULL, Qcur, Kcur, Vcur, nullptr, nullptr, layer.wv_b, kq_scale_mla, il);

                cb(cur, "mla_out", il);

            } else { // MLA KV cache disabled. Fall back to MHA KV cache.

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

                cb(Qcur, "mla_Q", il);

                // KV decompression: kv = kv_b_proj(kv_c_normed)

                ggml_tensor * kv = ggml_mul_mat(ctx0, layer.wkv_b, kv_cmpr);

                const int64_t kv_per_head = n_embd_head_qk_nope + n_embd_head_v_mla;

                // Split kv into k_nope and v

                ggml_tensor * k_nope = ggml_view_3d(ctx0, kv, n_embd_head_qk_nope, n_head, n_tokens,

                    ggml_row_size(kv->type, kv_per_head),

                    ggml_row_size(kv->type, kv_per_head * n_head), 0);

                ggml_tensor * Vcur = ggml_view_3d(ctx0, kv, n_embd_head_v_mla, n_head, n_tokens,

                    ggml_row_size(kv->type, kv_per_head),

                    ggml_row_size(kv->type, kv_per_head * n_head),

                    ggml_row_size(kv->type, n_embd_head_qk_nope));

                Vcur = ggml_cont(ctx0, Vcur);

                cb(Vcur, "mla_V", il);

                // Concatenate k_nope + k_pe (broadcast k_pe to all heads)

                // K = [k_nope, k_pe] where k_nope is [qk_nope_head_dim, n_head, n_tokens]

                // and k_pe is [qk_rope_head_dim, 1, n_tokens] broadcast to all heads

                // Need to broadcast k_pe from [qk_rope, 1, n_tokens] to [qk_rope, n_head, n_tokens]

                ggml_tensor * k_pe_target = ggml_new_tensor_3d(ctx0, k_pe->type, n_embd_head_qk_rope, n_head, n_tokens);

                ggml_tensor * k_pe_repeated = ggml_repeat(ctx0, k_pe, k_pe_target);

                ggml_tensor * Kcur = ggml_concat(ctx0, k_pe_repeated, k_nope, 0);

                cb(Kcur, "mla_K", il);

                // Direct softmax attention (with MHA KV cache)

                // Use build_attn with inp_attn for proper mask handling

                cur = build_attn(inp_attn_kv, layer.wo, NULL, Qcur, Kcur, Vcur, nullptr, nullptr, nullptr, kq_scale_mla, il);

                cb(cur, "mla_out", il);

            }

        }

        // On last layer, select only the output tokens

        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);

        }

        // Residual

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

        cb(ffn_inp, "ffn_inp", il);

        // FFN Norm

        cur = build_norm(ffn_inp, layer.ffn_norm, NULL, LLM_NORM_RMS, il);

        cb(cur, "ffn_norm", il);

        if ((uint32_t) il < hparams.n_layer_dense_lead) {

            // Dense FFN layer

            cur = build_ffn(cur,

                layer.ffn_up, NULL, NULL,

                layer.ffn_gate, NULL, NULL,

                layer.ffn_down, NULL, NULL,

                NULL, LLM_FFN_SILU, LLM_FFN_PAR, il);

            cb(cur, "ffn_out", il);

        } else {

            // MoE layer

            // Kimi uses moe_renormalize=True and routed_scaling_factor (stored as expert_weights_scale) = 2.446

            ggml_tensor * moe_out = build_moe_ffn(cur,

                layer.ffn_gate_inp,

                layer.ffn_up_exps,

                layer.ffn_gate_exps,

                layer.ffn_down_exps,

                layer.ffn_exp_probs_b,

                hparams.n_expert,

                hparams.n_expert_used,

                LLM_FFN_SILU, true,

                hparams.expert_weights_scale,

                (llama_expert_gating_func_type) hparams.expert_gating_func,

                il);

            cb(moe_out, "ffn_moe_out", il);

            // Shared expert

            {

                ggml_tensor * ffn_shexp = build_ffn(cur,

                        layer.ffn_up_shexp, NULL, NULL,

                        layer.ffn_gate_shexp, NULL, NULL,

                        layer.ffn_down_shexp, NULL, NULL,

                        NULL, LLM_FFN_SILU, LLM_FFN_PAR, il);

                cb(ffn_shexp, "ffn_shexp", il);

                cur = ggml_add(ctx0, moe_out, ffn_shexp);

                cb(cur, "ffn_out", il);

            }

        }

        // Residual

        cur = ggml_add(ctx0, cur, ffn_inp);

        cur = build_cvec(cur, il);

        cb(cur, "l_out", il);

        // input for next layer

        inpL = cur;

    }

    cur = inpL;

    // Final Norm

    cur = build_norm(cur, model.output_norm, NULL, LLM_NORM_RMS, -1);

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

    res->t_embd = cur;

    // Output

    cur = ggml_mul_mat(ctx0, model.output, cur);

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

    res->t_logits = cur;

    ggml_build_forward_expand(gf, cur);

}