/*
 * Copyright (c) 2017, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#include "aom_ports/mem.h"
#include "av1/common/scan.h"
#include "av1/common/idct.h"
#include "av1/common/txb_common.h"
#include "av1/decoder/decodemv.h"
#include "av1/decoder/decodetxb.h"

#define ACCT_STR __func__

static int read_golomb(MACROBLOCKD *xd, aom_reader *r) {
  int x = 1;
  int length = 0;
  int i = 0;

  while (!i) {
    i = aom_read_bit(r, ACCT_STR);
    ++length;
    if (length >= 32) {
      aom_internal_error(xd->error_info, AOM_CODEC_CORRUPT_FRAME,
                         "Invalid length in read_golomb");
      break;
    }
  }

  for (i = 0; i < length - 1; ++i) {
    x <<= 1;
    x += aom_read_bit(r, ACCT_STR);
  }

  return x - 1;
}

static INLINE int rec_eob_pos(const int eob_token, const int extra) {
  int eob = k_eob_group_start[eob_token];
  if (eob > 2) {
    eob += extra;
  }
  return eob;
}

#if !CONFIG_NEW_QUANT
static INLINE int get_dqv(const int16_t *dequant, int coeff_idx,
                          const qm_val_t *iqmatrix) {
  int dqv = dequant[!!coeff_idx];
#if CONFIG_AOM_QM
  if (iqmatrix != NULL)
    dqv =
        ((iqmatrix[coeff_idx] * dqv) + (1 << (AOM_QM_BITS - 1))) >> AOM_QM_BITS;
#else
  (void)iqmatrix;
#endif
  return dqv;
}
#endif

uint8_t av1_read_coeffs_txb(const AV1_COMMON *const cm, MACROBLOCKD *const xd,
                            aom_reader *const r, const int blk_row,
                            const int blk_col, const int plane,
#if CONFIG_NEW_QUANT
#if CONFIG_AOM_QM
                            int dq_profile,
#else
                            dequant_val_type_nuq *dq_val,
#endif  // CONFIG_AOM_QM
#endif  // CONFIG_NEW_QUANT
                            const TXB_CTX *const txb_ctx, const TX_SIZE tx_size,
                            int16_t *const max_scan_line, int *const eob) {
  FRAME_CONTEXT *const ec_ctx = xd->tile_ctx;
  const int32_t max_value = (1 << (7 + xd->bd)) - 1;
  const int32_t min_value = -(1 << (7 + xd->bd));
  const TX_SIZE txs_ctx = get_txsize_entropy_ctx(tx_size);
  const PLANE_TYPE plane_type = get_plane_type(plane);
  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  const int seg_eob = av1_get_max_eob(tx_size);
  int c = 0, v = 0;
  int num_updates = 0;
  struct macroblockd_plane *const pd = &xd->plane[plane];
  const int16_t *const dequant = pd->seg_dequant_QTX[mbmi->segment_id];
  tran_low_t *const tcoeffs = pd->dqcoeff;
  const int shift = av1_get_tx_scale(tx_size);
#if CONFIG_NEW_QUANT
#if !CONFIG_AOM_QM
  const tran_low_t *dqv_val = &dq_val[0][0];
#endif  // !CONFIG_AOM_QM

  const int nq_shift = shift;
#endif  // CONFIG_NEW_QUANT && !CONFIG_AOM_QM
  const int bwl = get_txb_bwl(tx_size);
  const int width = get_txb_wide(tx_size);
  const int height = get_txb_high(tx_size);
  int cul_level = 0;
  uint8_t levels_buf[TX_PAD_2D];
  uint8_t *const levels = set_levels(levels_buf, width);
  DECLARE_ALIGNED(16, uint8_t, level_counts[MAX_TX_SQUARE]);
  int8_t signs[MAX_TX_SQUARE] = { 0 };
  uint16_t update_pos[MAX_TX_SQUARE];

  const int all_zero = aom_read_symbol(
      r, ec_ctx->txb_skip_cdf[txs_ctx][txb_ctx->txb_skip_ctx], 2, ACCT_STR);
  // printf("txb_skip: %d %2d\n", txs_ctx, txb_ctx->txb_skip_ctx);
  *eob = 0;
  if (all_zero) {
    *max_scan_line = 0;
#if CONFIG_TXK_SEL
    if (plane == 0)
      mbmi->txk_type[(blk_row << MAX_MIB_SIZE_LOG2) + blk_col] = DCT_DCT;
#endif
    return 0;
  }

  memset(levels_buf, 0,
         sizeof(*levels_buf) *
             ((width + TX_PAD_HOR) * (height + TX_PAD_VER) + TX_PAD_END));

  (void)blk_row;
  (void)blk_col;
#if CONFIG_TXK_SEL
  av1_read_tx_type(cm, xd, blk_row, blk_col, plane, tx_size, r);
#endif
  const TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, blk_row, blk_col,
                                          tx_size, cm->reduced_tx_set_used);
#if CONFIG_AOM_QM
  const TX_SIZE qm_tx_size = av1_get_adjusted_tx_size(tx_size);
  const qm_val_t *iqmatrix =
      IS_2D_TRANSFORM(tx_type)
          ? pd->seg_iqmatrix[mbmi->segment_id][qm_tx_size]
          : cm->giqmatrix[NUM_QM_LEVELS - 1][0][qm_tx_size];
#else
  const qm_val_t *iqmatrix = NULL;
#endif
  (void)iqmatrix;
  const SCAN_ORDER *const scan_order = get_scan(cm, tx_size, tx_type, mbmi);
  const int16_t *const scan = scan_order->scan;
  int dummy;
  const int max_eob_pt = get_eob_pos_token(seg_eob, &dummy);
  int eob_extra = 0;
  int eob_pt = 1;

  (void)max_eob_pt;
  const int eob_multi_size = txsize_log2_minus4[tx_size];
  const int eob_multi_ctx = (tx_type_to_class[tx_type] == TX_CLASS_2D) ? 0 : 1;
  switch (eob_multi_size) {
    case 0:
      eob_pt =
          aom_read_symbol(r, ec_ctx->eob_flag_cdf16[plane_type][eob_multi_ctx],
                          5, ACCT_STR) +
          1;
      break;
    case 1:
      eob_pt =
          aom_read_symbol(r, ec_ctx->eob_flag_cdf32[plane_type][eob_multi_ctx],
                          6, ACCT_STR) +
          1;
      break;
    case 2:
      eob_pt =
          aom_read_symbol(r, ec_ctx->eob_flag_cdf64[plane_type][eob_multi_ctx],
                          7, ACCT_STR) +
          1;
      break;
    case 3:
      eob_pt =
          aom_read_symbol(r, ec_ctx->eob_flag_cdf128[plane_type][eob_multi_ctx],
                          8, ACCT_STR) +
          1;
      break;
    case 4:
      eob_pt =
          aom_read_symbol(r, ec_ctx->eob_flag_cdf256[plane_type][eob_multi_ctx],
                          9, ACCT_STR) +
          1;
      break;
    case 5:
      eob_pt =
          aom_read_symbol(r, ec_ctx->eob_flag_cdf512[plane_type][eob_multi_ctx],
                          10, ACCT_STR) +
          1;
      break;
    case 6:
    default:
      eob_pt = aom_read_symbol(
                   r, ec_ctx->eob_flag_cdf1024[plane_type][eob_multi_ctx], 11,
                   ACCT_STR) +
               1;
      break;
  }

  // printf("Dec: ");
  if (k_eob_offset_bits[eob_pt] > 0) {
    int bit = aom_read_symbol(
        r, ec_ctx->eob_extra_cdf[txs_ctx][plane_type][eob_pt], 2, ACCT_STR);
    // printf("eob_extra_cdf: %d %d %2d\n", txs_ctx, plane_type, eob_pt);
    if (bit) {
      eob_extra += (1 << (k_eob_offset_bits[eob_pt] - 1));
    }

    for (int i = 1; i < k_eob_offset_bits[eob_pt]; i++) {
      bit = aom_read_bit(r, ACCT_STR);
      // printf("eob_bit:\n");
      if (bit) {
        eob_extra += (1 << (k_eob_offset_bits[eob_pt] - 1 - i));
      }
      //  printf("%d ", bit);
    }
  }
  *eob = rec_eob_pos(eob_pt, eob_extra);
  // printf("=>[%d, %d], (%d, %d)\n", seg_eob, *eob, eob_pt, eob_extra);

  for (int i = 0; i < *eob; ++i) {
    c = *eob - 1 - i;
    const int pos = scan[c];
    const int coeff_ctx = get_nz_map_ctx(levels, pos, bwl, height, c,
                                         c == *eob - 1, tx_size, tx_type);
    aom_cdf_prob *cdf;
    int nsymbs;
    if (c == *eob - 1) {
      cdf = ec_ctx->coeff_base_eob_cdf[txs_ctx][plane_type][coeff_ctx];
      nsymbs = 3;
    } else {
      cdf = ec_ctx->coeff_base_cdf[txs_ctx][plane_type][coeff_ctx];
      nsymbs = 4;
    }
    const int level =
        aom_read_symbol(r, cdf, nsymbs, ACCT_STR) + (c == *eob - 1);

    // printf("base_cdf: %d %d %2d\n", txs_ctx, plane_type, coeff_ctx);
    // printf("base_cdf: %d %d %2d : %3d %3d %3d\n", txs_ctx, plane_type,
    // coeff_ctx,
    //            ec_ctx->coeff_base_cdf[txs_ctx][plane_type][coeff_ctx][0]>>7,
    //            ec_ctx->coeff_base_cdf[txs_ctx][plane_type][coeff_ctx][1]>>7,
    //            ec_ctx->coeff_base_cdf[txs_ctx][plane_type][coeff_ctx][2]>>7);
    if (level) {
      levels[get_padded_idx(pos, bwl)] = level;
      *max_scan_line = AOMMAX(*max_scan_line, pos);
      if (level < 3) {
        cul_level += level;
#if CONFIG_NEW_QUANT
#if CONFIG_AOM_QM
        v = av1_dequant_abscoeff_nuq(level, dequant[!!c], dq_profile, !!c,
                                     nq_shift);
#else
        dqv_val = &dq_val[pos != 0][0];
        v = av1_dequant_abscoeff_nuq(level, dequant[!!c], dqv_val, nq_shift);
#endif  // CONFIG_AOM_QM
#else
        v = level * get_dqv(dequant, scan[c], iqmatrix);
        v = v >> shift;
#endif  // CONFIG_NEW_QUANT
        tcoeffs[pos] = v;
      } else {
        update_pos[num_updates++] = pos;
      }
    }
  }

  // Loop to decode all signs in the transform block,
  // starting with the sign of the DC (if applicable)
  for (c = 0; c < *eob; ++c) {
    const int pos = scan[c];
    int8_t *const sign = &signs[pos];
    if (levels[get_padded_idx(pos, bwl)] == 0) continue;
    if (c == 0) {
      const int dc_sign_ctx = txb_ctx->dc_sign_ctx;
      *sign = aom_read_symbol(r, ec_ctx->dc_sign_cdf[plane_type][dc_sign_ctx],
                              2, ACCT_STR);
    } else {
      *sign = aom_read_bit(r, ACCT_STR);
    }
    if (*sign) tcoeffs[pos] = -tcoeffs[pos];
  }

  if (num_updates) {
    for (c = 0; c < num_updates; ++c) {
      const int pos = update_pos[c];
      uint8_t *const level = &levels[get_padded_idx(pos, bwl)];
      int idx = 0;
      int ctx;

      assert(*level > NUM_BASE_LEVELS);

#if USE_CAUSAL_BR_CTX
      ctx = get_br_ctx(levels, pos, bwl, level_counts[pos], tx_type);
#else
      ctx = get_br_ctx(levels, pos, bwl, level_counts[pos]);
#endif
      for (idx = 0; idx < COEFF_BASE_RANGE; idx += BR_CDF_SIZE - 1) {
        int k = aom_read_symbol(
            r, ec_ctx->coeff_br_cdf[AOMMIN(txs_ctx, TX_32X32)][plane_type][ctx],
            BR_CDF_SIZE, ACCT_STR);
        *level += k;
        if (k < BR_CDF_SIZE - 1) break;
      }
      if (*level <= NUM_BASE_LEVELS + COEFF_BASE_RANGE) {
        cul_level += *level;
        tran_low_t t;
#if CONFIG_NEW_QUANT
#if CONFIG_AOM_QM
        t = av1_dequant_abscoeff_nuq(*level, dequant[!!pos], dq_profile, !!pos,
                                     nq_shift);
#else
        dqv_val = &dq_val[pos != 0][0];
        t = av1_dequant_abscoeff_nuq(*level, dequant[!!pos], dqv_val, nq_shift);
#endif  // CONFIG_AOM_QM
#else
        t = *level * get_dqv(dequant, pos, iqmatrix);
        t = t >> shift;
#endif  // CONFIG_NEW_QUANT
        if (signs[pos]) t = -t;
        tcoeffs[pos] = clamp(t, min_value, max_value);
        continue;
      }
      // decode 0-th order Golomb code
      *level = COEFF_BASE_RANGE + 1 + NUM_BASE_LEVELS;
      // Save golomb in tcoeffs because adding it to level may incur overflow
      tran_low_t t = *level + read_golomb(xd, r);
      cul_level += (int)t;
#if CONFIG_NEW_QUANT
#if CONFIG_AOM_QM
      t = av1_dequant_abscoeff_nuq(t, dequant[!!pos], dq_profile, !!pos,
                                   nq_shift);
#else
      dqv_val = &dq_val[pos != 0][0];
      t = av1_dequant_abscoeff_nuq(t, dequant[!!pos], dqv_val, nq_shift);
#endif  // CONFIG_AOM_QM
#else
      t = t * get_dqv(dequant, pos, iqmatrix);
      t = t >> shift;
#endif  // CONFIG_NEW_QUANT
      if (signs[pos]) t = -t;
      tcoeffs[pos] = clamp(t, min_value, max_value);
    }
  }

  cul_level = AOMMIN(63, cul_level);

  // DC value
  set_dc_sign(&cul_level, tcoeffs[0]);

  return cul_level;
}

uint8_t av1_read_coeffs_txb_facade(const AV1_COMMON *const cm,
                                   MACROBLOCKD *const xd, aom_reader *const r,
                                   const int row, const int col,
                                   const int plane, const TX_SIZE tx_size,
                                   int16_t *const max_scan_line,
                                   int *const eob) {
  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  struct macroblockd_plane *const pd = &xd->plane[plane];

  const BLOCK_SIZE bsize = mbmi->sb_type;
  const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
#if CONFIG_NEW_QUANT
  const int seg_id = mbmi->segment_id;
  const int ref = is_inter_block(mbmi);
  int dq = get_dq_profile(cm->dq_type, xd->qindex[seg_id], ref, pd->plane_type);
#endif  //  CONFIG_NEW_QUANT

  TXB_CTX txb_ctx;
  get_txb_ctx(plane_bsize, tx_size, plane, pd->above_context + col,
              pd->left_context + row, &txb_ctx);
  uint8_t cul_level =
      av1_read_coeffs_txb(cm, xd, r, row, col, plane,
#if CONFIG_NEW_QUANT
#if CONFIG_AOM_QM
                          dq,
#else
                          pd->seg_dequant_nuq_QTX[seg_id][dq],
#endif  // CONFIG_AOM_QM
#endif  // CONFIG_NEW_QUANT
                          &txb_ctx, tx_size, max_scan_line, eob);
  av1_set_contexts(xd, pd, plane, tx_size, cul_level, col, row);
  return cul_level;
}