#!/bin/bash

# Destructor Crash Fix Verification Script
# Purpose: Run 20 development build benchmarks to verify crash fix
# Expected: 0% crash rate (previously 50%)

echo "========================================="
echo "Destructor Crash Fix Verification"
echo "========================================="
echo "Target: 20 successful runs"
echo "Build Mode: Development (HAKMEM_BUILD_RELEASE=0)"
echo "Expected Performance: ~30.7M ops/s"
echo ""

# Ensure we're in development build mode
export HAKMEM_BUILD_RELEASE=0

# Arrays to store results
declare -a throughputs
declare -a statuses
total_runs=20
success_count=0
crash_count=0

echo "Starting 20-run verification test..."
echo ""

for i in $(seq 1 $total_runs); do
    echo "========================================="
    echo "Run $i/$total_runs"
    echo "========================================="

    # Run the benchmark and capture output and exit code
    output=$(./larson_hakmem 1 10 1 1000 100 10000 42 2>&1)
    exit_code=$?

    # Check if benchmark completed successfully
    if echo "$output" | grep -q "Throughput" && [ $exit_code -eq 0 ]; then
        # Extract throughput value
        throughput=$(echo "$output" | grep "Throughput" | awk '{print $3}')
        throughputs+=("$throughput")
        statuses+=("SUCCESS")
        success_count=$((success_count + 1))
        echo "✓ SUCCESS: $throughput ops/s"
    else
        throughputs+=("0")
        statuses+=("CRASH")
        crash_count=$((crash_count + 1))
        echo "✗ CRASHED (exit code: $exit_code)"
        echo "Last few lines of output:"
        echo "$output" | tail -5
    fi

    echo ""
    sleep 1  # Brief pause between runs
done

echo ""
echo "========================================="
echo "FINAL RESULTS SUMMARY"
echo "========================================="
echo ""
echo "Execution Statistics:"
echo "  Total Runs:      $total_runs"
echo "  Successful:      $success_count"
echo "  Crashed:         $crash_count"
echo "  Success Rate:    $(awk "BEGIN {printf \"%.1f%%\", ($success_count/$total_runs)*100}")"
echo "  Crash Rate:      $(awk "BEGIN {printf \"%.1f%%\", ($crash_count/$total_runs)*100}")"
echo ""

if [ $success_count -gt 0 ]; then
    echo "Performance Statistics (Successful Runs):"

    # Calculate mean
    sum=0
    for tp in "${throughputs[@]}"; do
        if [ "$tp" != "0" ]; then
            sum=$(awk "BEGIN {print $sum + $tp}")
        fi
    done
    mean=$(awk "BEGIN {printf \"%.2f\", $sum/$success_count}")
    echo "  Mean:            $mean M ops/s"

    # Calculate min and max
    min=999999999
    max=0
    for tp in "${throughputs[@]}"; do
        if [ "$tp" != "0" ]; then
            if (( $(awk "BEGIN {print ($tp < $min)}") )); then
                min=$tp
            fi
            if (( $(awk "BEGIN {print ($tp > $max)}") )); then
                max=$tp
            fi
        fi
    done
    echo "  Min:             $min M ops/s"
    echo "  Max:             $max M ops/s"
    echo "  Range:           $(awk "BEGIN {printf \"%.2f\", $max - $min}") M ops/s"

    # Calculate standard deviation
    variance=0
    for tp in "${throughputs[@]}"; do
        if [ "$tp" != "0" ]; then
            diff=$(awk "BEGIN {print $tp - $mean}")
            variance=$(awk "BEGIN {print $variance + ($diff * $diff)}")
        fi
    done
    variance=$(awk "BEGIN {print $variance / $success_count}")
    stddev=$(awk "BEGIN {printf \"%.2f\", sqrt($variance)}")
    echo "  Std Deviation:   $stddev M ops/s"

    # Calculate coefficient of variation
    cv=$(awk "BEGIN {printf \"%.2f%%\", ($stddev/$mean)*100}")
    echo "  Variation:       $cv"

    # Compare to expected performance
    expected=30.7
    deviation=$(awk "BEGIN {printf \"%.2f%%\", (($mean - $expected)/$expected)*100}")
    echo ""
    echo "Comparison to Phase 4a Baseline (30.7M ops/s):"
    echo "  Deviation:       $deviation"
fi

echo ""
echo "Detailed Run-by-Run Results:"
echo "Run#  Status   Throughput (M ops/s)"
echo "----  -------  -------------------"
for i in $(seq 0 $((total_runs - 1))); do
    status="${statuses[$i]}"
    tp="${throughputs[$i]}"
    if [ "$tp" == "0" ]; then
        printf "%-4d  %-7s  %s\n" $((i + 1)) "$status" "N/A"
    else
        printf "%-4d  %-7s  %s\n" $((i + 1)) "$status" "$tp"
    fi
done

echo ""
echo "========================================="
echo "VERIFICATION CONCLUSION"
echo "========================================="
if [ $crash_count -eq 0 ]; then
    echo "✓ PASS: No crashes detected in 20 runs"
    echo "  Previous crash rate: 50%"
    echo "  Current crash rate:  0%"
    echo "  Improvement: 100% crash elimination"
else
    echo "✗ FAIL: Crashes still occurring"
    echo "  Expected: 0 crashes"
    echo "  Actual:   $crash_count crashes"
    echo "  This indicates the fix may be incomplete"
fi

echo ""
echo "Test completed at $(date)"
echo "========================================="