#!/usr/bin/env bash
# run_benchmark.sh — run all llama.cpp benchmarks for 3 LLMs × 4 quants
#
# Produces per-combination result files in the same directory as this script:
#   {prefix}_bench.json    — llama-bench throughput + model size
#   {prefix}_vram.log      — nvidia-smi dmon (raw, parsed later)
#   {prefix}_ttft.json     — TTFT / TPOT from llama-server stream
#   {prefix}_ppl.txt       — perplexity on wikitext-2
#   {prefix}_hellaswag.txt — HellaSwag accuracy (400 tasks)
#   {prefix}_winogrande.txt— Winogrande accuracy (all tasks)
#
# Run with:  bash results/run_benchmark.sh
# Skip already-done runs: set SKIP_EXISTING=1 (default)
# ─────────────────────────────────────────────────────────────────────────────
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"

BENCH="$ROOT/build/bin/llama-bench"
PPL="$ROOT/build/bin/llama-perplexity"

WIKI="$ROOT/wikitext-2-raw/wiki.test.raw"
HELLASWAG="$ROOT/hellaswag_val_400.txt"
WINOGRANDE="$ROOT/winogrande-debiased-eval.csv"
TTFT_SCRIPT="$SCRIPT_DIR/measure_ttft.py"

SKIP_EXISTING="${SKIP_EXISTING:-1}"    # set to 0 to re-run everything
SKIP_WINOGRANDE="${SKIP_WINOGRANDE:-0}" # set to 1 to skip Winogrande entirely
DEVICE="${DEVICE:-CUDA0}"              # single GPU to use (CUDA0 = GPU 0)
GPU_IDX=0                              # nvidia-smi GPU index matching DEVICE
NGL=99                                 # GPU layers
PPL_CTX=512                            # context window for perplexity
PPL_CHUNKS=400                         # chunks to evaluate (~488 total); all chunks for full accuracy
PPL_BATCH=8192                         # n_batch for perplexity: n_seq = PPL_BATCH/PPL_CTX
                                       # 8192/512 = 16 chunks processed in parallel per pass
HELLASWAG_TASKS=400                    # subset file already contains exactly 400 tasks

# ── Model paths ───────────────────────────────────────────────────────────────
HF_LLAMA="/home/user1/.cache/huggingface/hub/models--bartowski--Meta-Llama-3.1-8B-Instruct-GGUF/snapshots/bf5b95e96dac0462e2a09145ec66cae9a3f12067"
HF_QWEN="/home/user1/.cache/huggingface/hub/models--bartowski--Qwen2.5-7B-Instruct-GGUF/snapshots/8911e8a47f92bac19d6f5c64a2e2095bd2f7d031"
HF_GEMMA="/home/user1/.cache/huggingface/hub/models--bartowski--gemma-2-9b-it-GGUF/snapshots/d731033f3dc4018261fd39896e50984d398b4ac5"

declare -A MODEL   # MODEL[key] = path
MODEL[llama-f16]="$ROOT/models/llama-3.1-8b-instruct-f16.gguf"
MODEL[llama-Q8_0]="$HF_LLAMA/Meta-Llama-3.1-8B-Instruct-Q8_0.gguf"
MODEL[llama-Q4_K_M]="$ROOT/models/llama-3.1-8b-instruct-Q4_K_M.gguf"
MODEL[llama-Q2_K]="$HF_LLAMA/Meta-Llama-3.1-8B-Instruct-Q2_K.gguf"
MODEL[qwen-f16]="$HF_QWEN/Qwen2.5-7B-Instruct-f16.gguf"
MODEL[qwen-Q8_0]="$HF_QWEN/Qwen2.5-7B-Instruct-Q8_0.gguf"
MODEL[qwen-Q4_K_M]="$HF_QWEN/Qwen2.5-7B-Instruct-Q4_K_M.gguf"
MODEL[qwen-Q2_K]="$HF_QWEN/Qwen2.5-7B-Instruct-Q2_K.gguf"
MODEL[gemma-f16]="$ROOT/models/gemma-2-9b-it-f16.gguf"
MODEL[gemma-Q8_0]="$ROOT/models/gemma-2-9b-it-Q8_0.gguf"
MODEL[gemma-Q4_K_M]="$ROOT/models/gemma-2-9b-it-Q4_K_M.gguf"
MODEL[gemma-Q2_K]="$HF_GEMMA/gemma-2-9b-it-Q2_K.gguf"
# Result file prefix for each key (matches existing naming convention)
declare -A PREFIX
PREFIX[llama-f16]="llama-3.1-8b-instruct-f16"
PREFIX[llama-Q8_0]="llama-3.1-8b-instruct-Q8_0"
PREFIX[llama-Q4_K_M]="llama-3.1-8b-instruct-Q4_K_M"
PREFIX[llama-Q2_K]="llama-3.1-8b-instruct-Q2_K"
PREFIX[qwen-f16]="qwen2.5-7b-instruct-f16"
PREFIX[qwen-Q8_0]="qwen2.5-7b-instruct-Q8_0"
PREFIX[qwen-Q4_K_M]="qwen2.5-7b-instruct-Q4_K_M"
PREFIX[qwen-Q2_K]="qwen2.5-7b-instruct-Q2_K"
PREFIX[gemma-f16]="gemma-2-9b-it-f16"
PREFIX[gemma-Q8_0]="gemma-2-9b-it-Q8_0"
PREFIX[gemma-Q4_K_M]="gemma-2-9b-it-Q4_K_M"
PREFIX[gemma-Q2_K]="gemma-2-9b-it-Q2_K"
KEYS=(
    llama-f16  llama-Q8_0  llama-Q4_K_M  llama-Q2_K
    qwen-f16   qwen-Q8_0   qwen-Q4_K_M   qwen-Q2_K
    gemma-f16  gemma-Q8_0  gemma-Q4_K_M  gemma-Q2_K
)

# ── Helpers ───────────────────────────────────────────────────────────────────
log()  { echo "[$(date '+%H:%M:%S')] $*"; }
skip() { [[ "$SKIP_EXISTING" == "1" && -s "$1" ]]; }

# ── Main loop ─────────────────────────────────────────────────────────────────
for KEY in "${KEYS[@]}"; do
    MODEL_PATH="${MODEL[$KEY]}"
    PFX="$SCRIPT_DIR/${PREFIX[$KEY]}"

    if [[ ! -f "$MODEL_PATH" ]]; then
        echo "WARNING: model not found, skipping $KEY: $MODEL_PATH"
        continue
    fi

    log "═══ $KEY ═══"

    # ── 1. llama-bench (throughput + model size) with VRAM monitoring ─────────
    BENCH_OUT="$PFX"_bench.json
    VRAM_OUT="$PFX"_vram.log
    if skip "$BENCH_OUT"; then
        log "  [bench] skipping (exists)"
    else
        log "  [bench] starting nvidia-smi dmon (GPU $GPU_IDX only)..."
        nvidia-smi dmon -s m -d 1 -i "$GPU_IDX" > "$VRAM_OUT" &
        DMON_PID=$!

        log "  [bench] running llama-bench (single GPU: $DEVICE)..."
        "$BENCH" \
            -m "$MODEL_PATH" \
            -ngl "$NGL" \
            -dev "$DEVICE" \
            -p 512 -n 128 -r 3 \
            -o json \
            > "$BENCH_OUT"

        kill "$DMON_PID" 2>/dev/null && wait "$DMON_PID" 2>/dev/null || true
        log "  [bench] done → $BENCH_OUT"
    fi

    # ── 2. TTFT / TPOT via llama-server ──────────────────────────────────────
    TTFT_OUT="$PFX"_ttft.json
    if skip "$TTFT_OUT"; then
        log "  [ttft] skipping (exists)"
    else
        log "  [ttft] running measure_ttft.py (single GPU: $DEVICE)..."
        python3 "$TTFT_SCRIPT" -m "$MODEL_PATH" --device "$DEVICE" \
            > "$TTFT_OUT" \
            2> "$PFX"_ttft.log
        log "  [ttft] done → $TTFT_OUT"
    fi

    # ── 3. Perplexity (wikitext-2, fixed context for cross-model comparability)
    PPL_OUT="$PFX"_ppl.txt
    if skip "$PPL_OUT"; then
        log "  [ppl] skipping (exists)"
    else
        log "  [ppl] running llama-perplexity (ctx=$PPL_CTX, chunks=$PPL_CHUNKS, batch=$PPL_BATCH, GPU: $DEVICE)..."
        "$PPL" \
            -m "$MODEL_PATH" \
            -ngl "$NGL" \
            -dev "$DEVICE" \
            -f "$WIKI" \
            -c "$PPL_CTX" \
            -b "$PPL_BATCH" \
            --chunks "$PPL_CHUNKS" \
            2>&1 | grep "^Final estimate" | tail -1 > "$PPL_OUT"
        log "  [ppl] done → $PPL_OUT"
    fi

    # ── 4. HellaSwag accuracy ─────────────────────────────────────────────────
    HS_OUT="$PFX"_hellaswag.txt
    if skip "$HS_OUT"; then
        log "  [hellaswag] skipping (exists)"
    else
        log "  [hellaswag] running ($HELLASWAG_TASKS tasks, GPU: $DEVICE)..."
        "$PPL" \
            -m "$MODEL_PATH" \
            -ngl "$NGL" \
            -dev "$DEVICE" \
            -f "$HELLASWAG" \
            --hellaswag \
            --hellaswag-tasks "$HELLASWAG_TASKS" \
            2>&1 | grep -E "^[0-9]+[[:space:]]" | tail -1 > "$HS_OUT"
        log "  [hellaswag] done → $HS_OUT"
    fi

    # ── 5. Winogrande accuracy ────────────────────────────────────────────────
    WG_OUT="$PFX"_winogrande.txt
    if [[ "$SKIP_WINOGRANDE" == "1" ]]; then
        log "  [winogrande] skipped (SKIP_WINOGRANDE=1)"
    elif skip "$WG_OUT"; then
        log "  [winogrande] skipping (exists)"
    else
        log "  [winogrande] running (GPU: $DEVICE)..."
        "$PPL" \
            -m "$MODEL_PATH" \
            -ngl "$NGL" \
            -dev "$DEVICE" \
            -f "$WINOGRANDE" \
            --winogrande \
            2>&1 | grep -E "^[0-9]+[[:space:]]" | tail -1 > "$WG_OUT"
        log "  [winogrande] done → $WG_OUT"
    fi

    log "  ✓ $KEY complete"
done

log "All benchmarks done. Run: python3 $SCRIPT_DIR/parse_results.py"