#!/bin/bash
# Sign language recognition inference script – video to gloss sequence
#
# Full two-stage pipeline:
#   Video → [SMKD frozen] → Features → [SLTUNET] → Gloss sequence
#
# Usage:
#   ./inference.sh <video_path> [output_path]
#   ./inference.sh --benchmark-efficiency [options...]
#
# Examples:
#   ./inference.sh test.mp4
#   ./inference.sh test.mp4 output.txt
#
# Benchmark mode (used for ACL paper experiments):
#   ./inference.sh --benchmark-efficiency --video test.mp4 --num-samples 100
#   ./inference.sh --benchmark-efficiency --config full_pipeline
#   ./inference.sh --benchmark-efficiency --generate-table-only

set -e

# Resolve script directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
INFERENCE_ROOT="${SCRIPT_DIR}/inference_output"
mkdir -p "$INFERENCE_ROOT"

# Detect benchmark mode (scan all args)
for arg in "$@"; do
    if [ "$arg" == "--benchmark-efficiency" ]; then
# For benchmarking, redirect to simple_benchmark.sh
        echo ""
        echo "====================================================================="
        echo "  Efficiency Benchmarking"
        echo "====================================================================="
        echo ""
        echo "Please run the simple benchmark script instead:"
        echo "  bash eval/simple_benchmark.sh"
        echo ""
        exit 0
    fi
done

# ANSI colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

# Default configuration (7th training run with pose assistance)
SMKD_CONFIG="${SCRIPT_DIR}/smkd/asllrp_baseline.yaml"
SMKD_MODEL="/research/cbim/vast/sf895/code/Sign-X/output/huggingface_asllrp_repo/SignX/smkd/work_dir第七次训练全pose协助2000/asllrp_smkd/best_model.pt"
GLOSS_DICT="/research/cbim/vast/sf895/code/Sign-X/output/huggingface_asllrp_repo/SignX/smkd/asllrp第七次训练全pose协助2000/gloss_dict.npy"
SLTUNET_CHECKPOINT="/research/cbim/vast/sf895/code/Sign-X/output/huggingface_asllrp_repo/SignX/checkpoints_asllrp第七次训练全pose协助2000/best"
VOCAB_FILE="${SCRIPT_DIR}/preprocessed-asllrp/vocab.asllrp"
BPE_CODES="${SCRIPT_DIR}/preprocessed-asllrp/asllrp.bpe"

echo ""
echo "======================================================================"
echo "  Sign Language Recognition - Full Inference Pipeline"
echo "======================================================================"
echo ""
echo "  Pipeline: Video → [SMKD frozen] → Features → [SLTUNET] → Gloss"
echo "  Mode: inference (one-click two-stage execution)"
echo ""
echo "======================================================================"
echo ""

# Validate arguments
if [ "$#" -lt 1 ]; then
    echo -e "${RED}Error: missing video path${NC}"
    echo ""
    echo "Usage:"
    echo "  $0 <video_path> [output_path]"
    echo "  $0 --benchmark-efficiency [options...]"
    echo ""
    echo "Examples:"
    echo "  $0 test.mp4"
    echo "  $0 test.mp4 output.txt"
    echo "  $0 --benchmark-efficiency --video test.mp4"
    echo ""
    exit 1
fi

VIDEO_PATH="$1"

# Batch mode: if a directory is provided, iterate over supported video files.
if [ -d "$VIDEO_PATH" ]; then
    VIDEO_DIR=$(realpath "$VIDEO_PATH")
    if [ -n "$2" ]; then
        echo -e "${RED}Error: output path override is not supported in batch mode${NC}"
        exit 1
    fi

    echo ""
    echo "======================================================================"
    echo "  Batch Inference Mode"
    echo "======================================================================"
    echo "  Directory: $VIDEO_DIR"
    echo "  Outputs: stored per-video using default locations"
    echo "======================================================================"
    echo ""

    mapfile -d '' VIDEO_FILES < <(find "$VIDEO_DIR" -maxdepth 1 -type f \( -iname '*.mp4' -o -iname '*.mov' -o -iname '*.avi' -o -iname '*.mkv' \) -print0 | sort -z)
    if [ ${#VIDEO_FILES[@]} -eq 0 ]; then
        echo -e "${RED}Error: no video files (.mp4/.mov/.avi/.mkv) found under $VIDEO_DIR${NC}"
        exit 1
    fi

    batch_status=0
    total=${#VIDEO_FILES[@]}
    index=1
    for video_file in "${VIDEO_FILES[@]}"; do
        echo ""
        echo ">>> [Batch] Processing ($index/$total): $video_file"
        if bash "$SCRIPT_DIR/$(basename "${BASH_SOURCE[0]}")" "$video_file"; then
            echo ">>> [Batch] Completed: $video_file"
        else
            echo ">>> [Batch] Failed: $video_file"
            batch_status=1
        fi
        index=$((index + 1))
    done

    echo ""
    if [ $batch_status -eq 0 ]; then
        echo -e "${GREEN}✓ Batch inference finished without errors${NC}"
    else
        echo -e "${YELLOW}⚠ Batch inference finished with some failures (see logs above)${NC}"
    fi
    exit $batch_status
fi

if [ -z "$2" ]; then
    OUTPUT_PATH="$INFERENCE_ROOT/inference_output_$(date +%Y%m%d_%H%M%S)_$RANDOM.txt"
else
    OUTPUT_PATH="${2}"
fi

# Verify video file exists
if [ ! -f "$VIDEO_PATH" ]; then
    echo -e "${RED}Error: video file not found: $VIDEO_PATH${NC}"
    exit 1
fi

# Convert to absolute path
VIDEO_PATH=$(realpath "$VIDEO_PATH")

# If OUTPUT_PATH is already absolute, keep it; otherwise store under inference_output
if [[ "$OUTPUT_PATH" = /* ]]; then
    OUTPUT_PATH="$OUTPUT_PATH"
elif [ -f "$OUTPUT_PATH" ]; then
    OUTPUT_PATH=$(realpath "$OUTPUT_PATH")
else
    OUTPUT_PATH="${INFERENCE_ROOT}/${OUTPUT_PATH}"
fi
OUTPUT_CLEAN_PATH="${OUTPUT_PATH}.clean"

echo -e "${BLUE}[Configuration]${NC}"
echo "  Input video: $VIDEO_PATH"
echo "  Output file: $OUTPUT_PATH"
echo "  SMKD model: $SMKD_MODEL"
echo "  SLTUNET: $SLTUNET_CHECKPOINT"
echo ""

# Locate conda base
CONDA_BASE=$(conda info --base 2>/dev/null || echo "")

if [ -z "$CONDA_BASE" ]; then
    echo -e "${RED}Error: could not find conda${NC}"
    echo "Please make sure conda is installed."
    exit 1
fi

# Enable conda activation
source "${CONDA_BASE}/etc/profile.d/conda.sh"

# Temporary directory
TEMP_DIR=$(mktemp -d)
# Do not auto-delete on exit—we need the detailed attention results later

echo -e "${BLUE}[1/2] Extracting video features with SMKD...${NC}"
echo "  Environment: signx-slt (PyTorch)"
echo ""

# Activate PyTorch environment
conda activate signx-slt

if [ $? -ne 0 ]; then
    echo -e "${RED}Error: failed to activate signx-slt environment${NC}"
    exit 1
fi

# Create temporary video list file (required by InferFeeder)
VIDEO_LIST_FILE="$TEMP_DIR/video_list.txt"
echo "$VIDEO_PATH" > "$VIDEO_LIST_FILE"

echo "  ✓ Temporary video list created: $VIDEO_LIST_FILE"

# Run SignEmbedding to extract features
cd "$SCRIPT_DIR"

FEATURE_OUTPUT="$TEMP_DIR/features.h5"

python -c "
import sys
import os
sys.path.insert(0, 'smkd')

from smkd.sign_embedder import SignEmbedding
import h5py
import numpy as np

print('  Loading SMKD model...')
embedder = SignEmbedding(
    cfg='$SMKD_CONFIG',
    gloss_path='$GLOSS_DICT',
    sign_video_path='$VIDEO_LIST_FILE',
    model_path='$SMKD_MODEL',
    gpu_id='0',
    batch_size=1
)

print('  Extracting features...')
features = embedder.embed()

print('  Saving features to h5 file...')
with h5py.File('$FEATURE_OUTPUT', 'w') as hf:
    for key, feature in features.items():
        hf.create_dataset(key, data=feature)

print('  ✓ Feature extraction complete:', '$FEATURE_OUTPUT')
print('  Number of feature sequences:', len(features))

# Create source/target placeholder files for SLTUNET dataset
# Format: <image_index> <text>
# Use placeholder tokens because the gloss is what we want to predict
with open('$TEMP_DIR/src.txt', 'w') as f:
    for key in sorted(features.keys(), key=lambda x: int(x)):
        f.write(key + ' <unk>\\n')  # placeholder text

with open('$TEMP_DIR/tgt.txt', 'w') as f:
    for key in sorted(features.keys(), key=lambda x: int(x)):
        f.write('<unk>\\n')

print('  ✓ Source/target placeholder files ready')
"

if [ $? -ne 0 ]; then
    echo -e "${RED}Error: SMKD feature extraction failed${NC}"
    exit 1
fi

echo ""
echo -e "${GREEN}✓ Stage 1 complete: features extracted${NC}"
echo ""

# Switch to TensorFlow environment
echo -e "${BLUE}[2/2] Generating gloss sequence with SLTUNET...${NC}"
echo "  Environment: slt_tf1 (TensorFlow)"
echo ""

conda activate slt_tf1

if [ $? -ne 0 ]; then
    echo -e "${RED}Error: failed to activate slt_tf1 environment${NC}"
    exit 1
fi

export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python

# Determine output directory (for attention artifacts)
OUTPUT_DIR=$(dirname "$OUTPUT_PATH")
PREDICTION_TXT="$TEMP_DIR/prediction.txt"

# Build temporary inference config
cat > "$TEMP_DIR/infer_config.py" <<EOF
{
    'sign_cfg': '$SMKD_CONFIG',
    'gloss_path': '$GLOSS_DICT',
    'smkd_model_path': '$SMKD_MODEL',
    'img_test_file': '$FEATURE_OUTPUT',
    'src_test_file': '$TEMP_DIR/src.txt',
    'tgt_test_file': '$TEMP_DIR/tgt.txt',
    'src_vocab_file': '$VOCAB_FILE',
    'tgt_vocab_file': '$VOCAB_FILE',
    'src_codes': '$BPE_CODES',
    'tgt_codes': '$BPE_CODES',
    'output_dir': '$SLTUNET_CHECKPOINT',
    'test_output': '$PREDICTION_TXT',
    'eval_batch_size': 1,
    'gpus': [0],
    'remove_bpe': True,
    'collect_attention_weights': True,
    'inference_video_path': '$VIDEO_PATH',
}
EOF

echo "  Loading SLTUNET model..."
echo "  Running translation..."
echo ""

cd "$SCRIPT_DIR"

# Run inference and capture logs for later inspection
python run.py \
    --mode test \
    --config "$TEMP_DIR/infer_config.py" \
    2>&1 | tee "$TEMP_DIR/full_output.log" | grep -E "(Loading|Evaluating|BLEU|Scores|Saving detailed|Error)" || true

if [ -f "$TEMP_DIR/prediction.txt" ]; then
    echo ""
    echo -e "${GREEN}✓ Inference complete: gloss sequence generated${NC}"
    echo ""

    # Copy raw result
    cp "$TEMP_DIR/prediction.txt" "$OUTPUT_PATH"

    # Remove BPE markers (@@) for a clean text version
    sed 's/@@ //g' "$OUTPUT_PATH" > "$OUTPUT_CLEAN_PATH"

    # Move detailed attention analysis output if present
    DETAILED_DIRS=$(find "$TEMP_DIR" -maxdepth 1 -type d -name "detailed_*" 2>/dev/null)
    ATTENTION_ANALYSIS_DIR=""

    if [ ! -z "$DETAILED_DIRS" ]; then
        echo -e "${BLUE}Detected detailed attention analysis, saving...${NC}"
        for detailed_dir in $DETAILED_DIRS; do
            dir_name=$(basename "$detailed_dir")
            dest_path="$INFERENCE_ROOT/$dir_name"
            mv "$detailed_dir" "$dest_path"
            ATTENTION_ANALYSIS_DIR="$dest_path"

            # Count sample directories
            mapfile -t SAMPLE_DIRS < <(find "$dest_path" -mindepth 1 -maxdepth 1 -type d -print | sort)
            sample_count=${#SAMPLE_DIRS[@]}
            echo "  ✓ Saved $sample_count sample analyses to: $dest_path"

            # Step 1: feature-to-frame mapping
            echo ""
            echo -e "${BLUE}Generating feature-to-frame mapping...${NC}"
            if [ -f "$SCRIPT_DIR/eval/generate_feature_mapping.py" ]; then
                # Switch to signx-slt environment (CV2 available)
                conda activate signx-slt
                if [ ${#SAMPLE_DIRS[@]} -eq 0 ]; then
                    echo "  ⚠ No sample directories found, skipping mapping"
                else
                    for sample_dir in "${SAMPLE_DIRS[@]}"; do
                        if [ -d "$sample_dir" ]; then
                            python "$SCRIPT_DIR/eval/generate_feature_mapping.py" "$sample_dir" "$VIDEO_PATH" 2>&1 | grep -E "(feature|frame|mapping|error)"
                        fi
                    done
                fi
            else
                echo "  ⓘ generate_feature_mapping.py not found, skipping mapping"
            fi

            # Step 2: regenerate visualizations
            echo ""
            echo -e "${BLUE}Regenerating visualizations (latest code)...${NC}"
            if [ -f "$SCRIPT_DIR/eval/regenerate_visualizations.py" ]; then
                if [ ${#SAMPLE_DIRS[@]} -eq 0 ]; then
                    echo "  ⚠ No sample directories found, skipping visualization"
                else
                    python "$SCRIPT_DIR/eval/regenerate_visualizations.py" "$dest_path" "$VIDEO_PATH"
                fi
            else
                echo "  ⓘ regenerate_visualizations.py not found, falling back to legacy scripts"
                if [ -f "$SCRIPT_DIR/eval/generate_gloss_frames.py" ]; then
                    python "$SCRIPT_DIR/eval/generate_gloss_frames.py" "$dest_path" "$VIDEO_PATH"
                fi
            fi

            # Step 3: interactive HTML visualization
            echo ""
            echo -e "${BLUE}Creating interactive HTML visualization...${NC}"
            if [ -f "$SCRIPT_DIR/eval/generate_interactive_alignment.py" ]; then
                if [ ${#SAMPLE_DIRS[@]} -eq 0 ]; then
                    echo "  ⚠ No sample directories found, skipping HTML generation"
                else
                    for sample_dir in "${SAMPLE_DIRS[@]}"; do
                        if [ -d "$sample_dir" ]; then
                            python "$SCRIPT_DIR/eval/generate_interactive_alignment.py" "$sample_dir"
                        fi
                    done
                fi
            else
                echo "  ⓘ generate_interactive_alignment.py not found, skipping HTML generation"
            fi

            # Step 4: extract attention keyframes
            echo ""
            echo -e "${BLUE}Extracting attention keyframes...${NC}"
            if [ -f "$SCRIPT_DIR/eval/extract_attention_keyframes.py" ]; then
                if [ ${#SAMPLE_DIRS[@]} -eq 0 ]; then
                    echo "  ⚠ No sample directories found, skipping keyframes"
                else
                    for sample_dir in "${SAMPLE_DIRS[@]}"; do
                        if [ -d "$sample_dir" ]; then
                            echo "  Processing sample: $(basename "$sample_dir")"
                            python "$SCRIPT_DIR/eval/extract_attention_keyframes.py" "$sample_dir" "$VIDEO_PATH"
                        fi
                    done
                fi
            else
                echo "  ⓘ extract_attention_keyframes.py not found, skipping keyframes"
            fi

            # Switch back to slt_tf1 environment
            conda activate slt_tf1
        done
    fi

    # Move final output into the primary sample directory for convenience
    if [ ! -z "$ATTENTION_ANALYSIS_DIR" ] && [ -d "$ATTENTION_ANALYSIS_DIR" ]; then
        PRIMARY_SAMPLE_DIR=$(find "$ATTENTION_ANALYSIS_DIR" -mindepth 1 -maxdepth 1 -type d | sort | head -n 1)
        if [ ! -z "$PRIMARY_SAMPLE_DIR" ] && [ -d "$PRIMARY_SAMPLE_DIR" ]; then
            TRANSLATION_FILE="${PRIMARY_SAMPLE_DIR}/translation.txt"

            # Keep a copy for debugging inside the sample directory
            MOVED_BPE_FILE=""
            MOVED_CLEAN_FILE=""
            if [ -f "$OUTPUT_PATH" ]; then
                NEW_OUTPUT_PATH="${PRIMARY_SAMPLE_DIR}/$(basename "$OUTPUT_PATH")"
                mv "$OUTPUT_PATH" "$NEW_OUTPUT_PATH"
                MOVED_BPE_FILE="$NEW_OUTPUT_PATH"
            fi

            if [ -f "$OUTPUT_CLEAN_PATH" ]; then
                CLEAN_BASENAME=$(basename "$OUTPUT_CLEAN_PATH")
                NEW_CLEAN_PATH="${PRIMARY_SAMPLE_DIR}/${CLEAN_BASENAME}"
                mv "$OUTPUT_CLEAN_PATH" "$NEW_CLEAN_PATH"
                MOVED_CLEAN_FILE="$NEW_CLEAN_PATH"
            fi

            # Generate translation.txt if it was not created
            if [ ! -f "$TRANSLATION_FILE" ]; then
                TRANS_BPE=$(head -n 1 "$TEMP_DIR/prediction.txt")
                TRANS_CLEAN=$(sed 's/@@ //g' "$TEMP_DIR/prediction.txt" | head -n 1)
                {
                    echo "With BPE: ${TRANS_BPE}"
                    echo "Clean: ${TRANS_CLEAN}"
                    echo "Ground Truth: [NOT AVAILABLE]"
                } > "$TRANSLATION_FILE"
            fi

            # Remove redundant files now that translation.txt exists
            if [ -n "$MOVED_BPE_FILE" ] && [ -f "$MOVED_BPE_FILE" ] && [ "$MOVED_BPE_FILE" != "$TRANSLATION_FILE" ]; then
                rm -f "$MOVED_BPE_FILE"
            fi
            if [ -n "$MOVED_CLEAN_FILE" ] && [ -f "$MOVED_CLEAN_FILE" ] && [ "$MOVED_CLEAN_FILE" != "$TRANSLATION_FILE" ]; then
                rm -f "$MOVED_CLEAN_FILE"
            fi

            # Preserve a copy of the input video inside the sample directory for reference
            if [ -f "$VIDEO_PATH" ]; then
                VIDEO_BASENAME=$(basename "$VIDEO_PATH")
                DEST_VIDEO_PATH="${PRIMARY_SAMPLE_DIR}/${VIDEO_BASENAME}"
                if [ ! -f "$DEST_VIDEO_PATH" ]; then
                    cp "$VIDEO_PATH" "$DEST_VIDEO_PATH"
                fi
            fi

            OUTPUT_PATH="$TRANSLATION_FILE"
            OUTPUT_CLEAN_PATH="$TRANSLATION_FILE"
        fi
    fi

    echo ""
    echo "======================================================================"
    echo "  Inference succeeded!"
    echo "======================================================================"
    echo ""
    echo "Output files:"
    echo "  Raw (with BPE): $OUTPUT_PATH"
    echo "  Cleaned result: $OUTPUT_CLEAN_PATH"

    if [ ! -z "$ATTENTION_ANALYSIS_DIR" ]; then
        echo "  Detailed analysis dir: $ATTENTION_ANALYSIS_DIR"
        echo ""
        echo "Attention assets include:"
        echo "  - attention_heatmap.png"
        echo "  - word_frame_alignment.png"
        echo "  - gloss_to_frames.png"
        echo "  - analysis_report.txt"
        echo "  - attention_weights.npy"
        echo "  - attention_keyframes/ (per-gloss keyframe previews)"
        echo "    * peak feature frames per gloss"
        echo "    * heatmaps overlayed on the video frames"
    fi

    echo ""
    echo "Recognition result (BPE removed):"
    echo "----------------------------------------------------------------------"
    head -5 "$OUTPUT_CLEAN_PATH" | sed 's/^/  /'
    echo "----------------------------------------------------------------------"
    echo ""
    echo -e "${GREEN}✓ Full pipeline completed (SMKD → SLTUNET)${NC}"
    echo ""

    # Clean temp directory
    echo -e "${BLUE}Cleaning temporary files...${NC}"
    rm -rf "$TEMP_DIR"
    echo "  ✓ Temporary files removed"
    echo ""
else
    echo -e "${RED}Error: inference failed, no output generated${NC}"
    rm -rf "$TEMP_DIR"
    exit 1
fi