#!/usr/bin/env bash
# Batch evaluation for ALL CTA ablation variants TRAINED on the diffusion-only
# split. For each variant, picks 4 ckpts (top-3 by valauc + last) and runs
# inference on 6 datasets:
#
#   ours_sadtalker — held-out 3DMM family from FairTalking test split (SadTalker)
#   ours_edtalk    — held-out AE/VAE family from FairTalking test split (EDTalk)
#   ours_float     — held-out Flow-Matching family from FairTalking test split
#   thb            — TalkingHeadBench (cross-source)
#   ff++           — FaceForensics++ (cross-source)
#   mmdf           — MMDF (cross-source)
#
# Fairness metrics (race4) are emitted only for the three `ours_*` datasets,
# because thb/ff++/mmdf don't ship race4 annotations matched to FairTalking.
#
# Output layout:
#   outputs/cta_test_result/diffusion_ablation_<TS>/
#     ├── results.csv                                      one row per (variant, ckpt, dataset)
#     ├── logs/<variant>__<kind>__<dataset>.log
#     └── runs/<variant>/<kind>__<dataset>__<ts>/          one subdir per inference run
#
# Usage:
#   bash scripts/batch_test_cta_ablation_diffusion.sh
#   bash scripts/batch_test_cta_ablation_diffusion.sh --group M
#   bash scripts/batch_test_cta_ablation_diffusion.sh A1_full M3_intra_modal
#   bash scripts/batch_test_cta_ablation_diffusion.sh --datasets ours_sadtalker ours_float
#   bash scripts/batch_test_cta_ablation_diffusion.sh --num-top 1
#   bash scripts/batch_test_cta_ablation_diffusion.sh --dry-run
#   bash scripts/batch_test_cta_ablation_diffusion.sh --run-dir /path/to/specific/run/dir
set -eo pipefail
cd "$(dirname "$0")/.."

[ -f .env ] && set -a && . ./.env && set +a

# ---- python interpreter resolution -----------------------------------------
resolve_python() {
    if [[ -n "${PY:-}" ]] && "$PY" -c 'import hydra' >/dev/null 2>&1; then
        echo "$PY"; return
    fi
    if command -v python3 >/dev/null 2>&1 && python3 -c 'import hydra' >/dev/null 2>&1; then
        command -v python3; return
    fi
    if [[ -x /opt/conda/envs/av/bin/python3 ]] && \
       /opt/conda/envs/av/bin/python3 -c 'import hydra' >/dev/null 2>&1; then
        echo "/opt/conda/envs/av/bin/python3"; return
    fi
    cat <<EOF >&2
[ablation-diffusion-test] FATAL: cannot find a python interpreter with hydra installed.
  Activate the project env (e.g. conda activate pytorch) or pass PY=/path/to/python3.
EOF
    exit 1
}
PY="$(resolve_python)"
echo "[ablation-diffusion-test] using python: $PY"

OUTPUT_DIR="outputs"
TIMESTAMP="$(date +%Y%m%d_%H%M%S)"
TEST_RESULT_ROOT="outputs/cta_test_result"
BATCH_DIR="${TEST_RESULT_ROOT}/diffusion_ablation_${TIMESTAMP}"
RESULTS_CSV="${BATCH_DIR}/results.csv"
LOG_DIR="${BATCH_DIR}/logs"
RUNS_DIR="${BATCH_DIR}/runs"
mkdir -p "$LOG_DIR" "$RUNS_DIR"

# ---- variant universe -------------------------------------------------------
ALL_VARIANTS=(
    A1_full A2_no_asym A3_no_ltotal A4_asym_only A5_pooled_only
    B1_real_only B2_all_samples B3_no_predictor
    C1_no_loss_asym C2_no_loss_aux C3_no_loss_av C4_no_loss_va C5_no_detach
    D1_depth_1 D2_depth_4 D3_depth_8 D4_mlp_predictor D5_shared_predictor
    E1_video_freeze_0 E2_video_freeze_07 E3_video_freeze_10
    F1_audio_freeze_0 F2_audio_freeze_08
    G2_random_crop
    M1_video_only M2_audio_only M3_intra_modal M4_noise_target M5_shuffle_pair
    M6_drop_audio_infer M7_drop_video_infer
)
declare -A GROUP_VARIANTS
GROUP_VARIANTS[A]="A1_full A2_no_asym A3_no_ltotal A4_asym_only A5_pooled_only"
GROUP_VARIANTS[B]="B1_real_only B2_all_samples B3_no_predictor"
GROUP_VARIANTS[C]="C1_no_loss_asym C2_no_loss_aux C3_no_loss_av C4_no_loss_va C5_no_detach"
GROUP_VARIANTS[D]="D1_depth_1 D2_depth_4 D3_depth_8 D4_mlp_predictor D5_shared_predictor"
GROUP_VARIANTS[E]="E1_video_freeze_0 E2_video_freeze_07 E3_video_freeze_10"
GROUP_VARIANTS[F]="F1_audio_freeze_0 F2_audio_freeze_08"
GROUP_VARIANTS[G]="G2_random_crop"
GROUP_VARIANTS[M]="M1_video_only M2_audio_only M3_intra_modal M4_noise_target M5_shuffle_pair M6_drop_audio_infer M7_drop_video_infer"

# ---- args -------------------------------------------------------------------
VARIANTS=()
DATASETS=("ours_sadtalker" "ours_edtalk" "ours_float" "thb" "ff++" "mmdf")
GROUP=""
DRY_RUN=false
NUM_TOP=3
SKIP_LAST=false
SPECIFIC_RUN_DIR=""

while [[ $# -gt 0 ]]; do
    case "$1" in
        --group) GROUP="$2"; shift 2 ;;
        --datasets)
            shift
            DATASETS=()
            while [[ $# -gt 0 && "$1" != --* ]]; do DATASETS+=("$1"); shift; done
            ;;
        --num-top) NUM_TOP="$2"; shift 2 ;;
        --no-last) SKIP_LAST=true; shift ;;
        --dry-run) DRY_RUN=true; shift ;;
        --run-dir) SPECIFIC_RUN_DIR="$2"; shift 2 ;;
        -h|--help) grep -E '^#( |$)' "$0" | sed 's/^# \?//'; exit 0 ;;
        --*) echo "Unknown flag: $1"; exit 1 ;;
        *) VARIANTS+=("$1"); shift ;;
    esac
done

if [[ -n "$SPECIFIC_RUN_DIR" ]]; then
    if [[ ! -d "$SPECIFIC_RUN_DIR" ]]; then
        echo "Error: Run directory does not exist: $SPECIFIC_RUN_DIR"; exit 1
    fi
    # Extract variant name from run directory path
    RUN_DIR_BASENAME=$(basename "$SPECIFIC_RUN_DIR")
    VARIANT_FROM_DIR=$(echo "$RUN_DIR_BASENAME" | sed -E 's/cta_(ablation_)?diffusion_([^_]+)_.*/\2/')
    if [[ -z "$VARIANT_FROM_DIR" ]]; then
        echo "Error: Could not extract variant name from run directory: $SPECIFIC_RUN_DIR"; exit 1
    fi
    VARIANTS=("$VARIANT_FROM_DIR")
elif [[ -n "$GROUP" ]]; then
    if [[ -z "${GROUP_VARIANTS[$GROUP]+_}" ]]; then
        echo "Unknown group: $GROUP. Valid: A B C D E F G M"; exit 1
    fi
    for v in ${GROUP_VARIANTS[$GROUP]}; do VARIANTS+=("$v"); done
fi
if [[ ${#VARIANTS[@]} -eq 0 ]]; then
    VARIANTS=("${ALL_VARIANTS[@]}")
fi

echo "============================================================"
echo "[ablation-diffusion-test] start:        $(date '+%Y-%m-%d %H:%M:%S')"
echo "[ablation-diffusion-test] timestamp:    $TIMESTAMP"
echo "[ablation-diffusion-test] results CSV:  $RESULTS_CSV"
echo "[ablation-diffusion-test] per-run logs: $LOG_DIR/"
echo "[ablation-diffusion-test] variants:     ${VARIANTS[*]}"
echo "[ablation-diffusion-test] datasets:     ${DATASETS[*]}"
echo "[ablation-diffusion-test] num_top:      $NUM_TOP  (+ last.ckpt)"
if [[ -n "$SPECIFIC_RUN_DIR" ]]; then
    echo "[ablation-diffusion-test] specific run dir: $SPECIFIC_RUN_DIR"
fi
$DRY_RUN && echo "[ablation-diffusion-test] DRY RUN: will only show what would be tested"
echo "============================================================"

echo "variant,group,dataset,ckpt_name,ckpt_kind,test_acc,test_auc,test_ap,test_acc_at_eer,F_FPR,F_OAE,F_DP,F_MEO,run_dir,test_out_dir,predictions_csv,timestamp" > "$RESULTS_CSV"

# ---- helpers ----------------------------------------------------------------
group_of() {
    case "$1" in
        A*) echo A ;; B*) echo B ;; C*) echo C ;; D*) echo D ;;
        E*) echo E ;; F*) echo F ;; G*) echo G ;; M*) echo M ;;
        *)  echo "?" ;;
    esac
}

# Find the most-recent diffusion-trained run dir for a variant. Strict regex
# guards against test-output dir pollution (e.g. _test_*) ever being matched.
find_latest_run_dir() {
    local variant="$1"
    local match
    match=$(ls -d "$OUTPUT_DIR"/cta_ablation_diffusion_${variant}_* 2>/dev/null \
            | grep -E "/cta_ablation_diffusion_${variant}_[0-9]{8}_[0-9]{6}$" \
            | sort -r | head -1 || true)
    if [[ -n "$match" ]]; then
        echo "$match"; return
    fi
    local exact="$OUTPUT_DIR/cta_ablation_diffusion_${variant}"
    if [[ -d "$exact" ]]; then echo "$exact"; return; fi
    echo ""
}

# Map dataset name -> hydra data config.
# The three ours_* names route to the family-specific holdout configs.
data_cfg_for() {
    case "$1" in
        ours_sadtalker) echo "fairtalking_test_sadtalker" ;;
        ours_edtalk)    echo "fairtalking_test_edtalk" ;;
        ours_float)     echo "fairtalking_test_float" ;;
        thb)            echo "fairtalking_thb" ;;
        ff++)           echo "fairtalking_ffpp" ;;
        mmdf)           echo "fairtalking_mmdf" ;;
        hdtf)           echo "fairtalking_hdtf_paired" ;;
        *) echo ""; return 1 ;;
    esac
}

# ours_* datasets carry race4 (FairTalking test.csv has it), so fairness
# metrics are emitted there; thb/ff++/mmdf don't.
dataset_has_fairness() {
    case "$1" in
        ours_*) return 0 ;;
        *)      return 1 ;;
    esac
}

extract_metric() {
    local key="$1" output="$2"
    echo "$output" \
        | grep -E "${key}[[:space:]]" \
        | tail -1 \
        | awk '{
            for (i = NF; i >= 1; i--) {
                if ($i ~ /^-?[0-9.]+$/) { print $i; exit }
            }
        }' \
        | tr -d '\r'
}
extract_kv() {
    local out="$1" key="$2"
    echo "$out" | tr ' ' '\n' | awk -F= -v k="$key" '$1==k {print $2; exit}' | tr -d '\r'
}
extract_fairness() {
    local csv="$1" key="$2"
    [[ -f "$csv" ]] || { echo ""; return; }
    awk -F, -v k="$key" '$1=="summary" && $(NF-1)==k {print $NF; exit}' "$csv" | tr -d '\r'
}

pick_ckpts() {
    local run_dir="$1" num_top="$2" skip_last="${3:-false}"
    local ckpt_dir="$run_dir/checkpoints"
    [[ -d "$ckpt_dir" ]] || return 0
    local top
    top=$(ls -1 "$ckpt_dir"/*.ckpt 2>/dev/null | grep -v '/last\.ckpt$' | sort -r || true)
    if [[ -n "$top" ]]; then
        local i=1
        while IFS= read -r p; do
            [[ -z "$p" ]] && continue
            echo "top${i}:$p"; i=$((i + 1))
            if (( i > num_top )); then break; fi
        done <<< "$top"
    fi
    if [[ "$skip_last" != "true" ]] && [[ -f "$ckpt_dir/last.ckpt" ]]; then
        echo "last:$ckpt_dir/last.ckpt"
    fi
}

run_one_test() {
    local variant="$1" ckpt="$2" ckpt_kind="$3" dataset="$4" run_dir="$5"
    local data_cfg ts log_path pred_csv test_out_dir out rc grp acc auc extra ap acc_eer
    local f_fpr f_oae f_dp f_meo

    grp=$(group_of "$variant")
    data_cfg=$(data_cfg_for "$dataset") || true
    if [[ -z "$data_cfg" ]]; then
        echo "$variant,$grp,$dataset,$(basename "$ckpt"),$ckpt_kind,UNKNOWN_DATASET,N/A,N/A,N/A,,,,,$run_dir,,,$TIMESTAMP"
        return
    fi
    ts="$(date +%Y%m%d_%H%M%S)"
    test_out_dir="${RUNS_DIR}/${variant}/${ckpt_kind}__${dataset}__${ts}"
    mkdir -p "$test_out_dir"
    pred_csv="${test_out_dir}/test_predictions.csv"
    log_path="$LOG_DIR/${variant}__${ckpt_kind}__${dataset}.log"

    if $DRY_RUN; then
        echo "$variant,$grp,$dataset,$(basename "$ckpt"),$ckpt_kind,DRY,DRY,DRY,DRY,,,,,$run_dir,$test_out_dir,$pred_csv,$ts"
        return
    fi

    set +e
    out=$("$PY" src/train.py \
        method=cta_ablation \
        method.ablation_variant="$variant" \
        data="$data_cfg" \
        trainer=ddp \
        backbone=timesformer \
        +test_only=true \
        +test_ckpt="$ckpt" \
        +test_predictions_csv="$pred_csv" \
        output_dir="$test_out_dir" \
        hydra.run.dir="$test_out_dir/hydra" \
        experiment_name="cta_ablation_diffusion_${variant}_test_${dataset}_${ckpt_kind}" \
        2>&1)
    rc=$?
    set -e
    echo "$out" > "$log_path"

    if [[ $rc -ne 0 ]]; then
        echo "$variant,$grp,$dataset,$(basename "$ckpt"),$ckpt_kind,ERROR_RC${rc},ERROR_RC${rc},ERROR_RC${rc},ERROR_RC${rc},,,,,$run_dir,$test_out_dir,$pred_csv,$ts"
        return
    fi

    acc=$(extract_metric "test/acc" "$out"); acc=${acc:-N/A}
    auc=$(extract_metric "test/auc" "$out"); auc=${auc:-N/A}

    ap="N/A"; acc_eer="N/A"
    if [[ -f "$pred_csv" ]]; then
        set +e
        extra=$("$PY" scripts/compute_extra_metrics.py "$pred_csv" 2>/dev/null)
        if [[ $? -eq 0 ]]; then
            ap=$(extract_kv "$extra" "ap"); ap=${ap:-N/A}
            acc_eer=$(extract_kv "$extra" "acc_at_eer"); acc_eer=${acc_eer:-N/A}
        fi
        set -e
    fi

    f_fpr=""; f_oae=""; f_dp=""; f_meo=""
    if dataset_has_fairness "$dataset"; then
        local fairness_csv="${pred_csv%.csv}_fairness.csv"
        f_fpr=$(extract_fairness "$fairness_csv" "F_FPR")
        f_oae=$(extract_fairness "$fairness_csv" "F_OAE")
        f_dp=$(extract_fairness  "$fairness_csv" "F_DP")
        f_meo=$(extract_fairness "$fairness_csv" "F_MEO")
    fi

    echo "$variant,$grp,$dataset,$(basename "$ckpt"),$ckpt_kind,$acc,$auc,$ap,$acc_eer,$f_fpr,$f_oae,$f_dp,$f_meo,$run_dir,$test_out_dir,$pred_csv,$ts"
}

# ---- main loop --------------------------------------------------------------
for variant in "${VARIANTS[@]}"; do
    grp=$(group_of "$variant")
    
    if [[ -n "$SPECIFIC_RUN_DIR" ]]; then
        run_dir="$SPECIFIC_RUN_DIR"
        echo ""
        echo "============================================================"
        echo "[$variant] Using specific run dir: $run_dir"
        echo "============================================================"
    else
        run_dir=$(find_latest_run_dir "$variant")
        if [[ -z "$run_dir" ]]; then
            echo ""
            echo "[$variant] NO diffusion-trained run dir found (looked for outputs/cta_ablation_diffusion_${variant}_*); skipping all combos"
            for ds in "${DATASETS[@]}"; do
                echo "$variant,$grp,$ds,NO_RUN_DIR,N/A,N/A,N/A,N/A,N/A,,,,,,,,$TIMESTAMP" >> "$RESULTS_CSV"
            done
            continue
        fi
    fi

    mapfile -t CKPTS < <(pick_ckpts "$run_dir" "$NUM_TOP" "$SKIP_LAST")
    if [[ ${#CKPTS[@]} -eq 0 ]]; then
        echo ""
        echo "[$variant] NO checkpoints in $run_dir/checkpoints; skipping"
        for ds in "${DATASETS[@]}"; do
            echo "$variant,$grp,$ds,NO_CKPT,N/A,N/A,N/A,N/A,N/A,,,,,$run_dir,,,$TIMESTAMP" >> "$RESULTS_CSV"
        done
        continue
    fi

    echo ""
    echo "============================================================"
    echo "[$variant] run dir:    $run_dir"
    echo "[$variant] checkpoints to test (kind:path):"
    for kp in "${CKPTS[@]}"; do echo "  - $kp"; done
    echo "============================================================"

    for kp in "${CKPTS[@]}"; do
        ckpt_kind="${kp%%:*}"
        ckpt_path="${kp#*:}"
        for ds in "${DATASETS[@]}"; do
            echo ""
            echo "[$(date '+%H:%M:%S')] [$variant] [$ckpt_kind] [$ds] -> $(basename "$ckpt_path")"
            row=$(run_one_test "$variant" "$ckpt_path" "$ckpt_kind" "$ds" "$run_dir")
            echo "  -> $row"
            echo "$row" >> "$RESULTS_CSV"
        done
    done
done

echo ""
echo "============================================================"
echo "[ablation-diffusion-test] end:    $(date '+%Y-%m-%d %H:%M:%S')"
echo "[ablation-diffusion-test] CSV:    $RESULTS_CSV"
echo "[ablation-diffusion-test] logs:   $LOG_DIR/"
echo "============================================================"
echo ""
echo "Quick preview (first 30 rows):"
if command -v column >/dev/null 2>&1; then
    head -30 "$RESULTS_CSV" | column -t -s,
else
    head -30 "$RESULTS_CSV"
fi