#!/bin/bash
# scripts/run_benchmarks.sh
#
# Wrapper script for running benchmarks with bashrs or fallback to hyperfine.
# Provides standardized interface for benchmark execution with statistical rigor.
#
# Usage:
#   ./scripts/run_benchmarks.sh --benchmarks critical --output results.json
#   ./scripts/run_benchmarks.sh --benchmarks all --profiles all --output results.json

set -e

# Default values
BENCHMARKS="critical"
PROFILES="release"
OUTPUT="benchmarks/results/latest.json"
WARMUP=3
ITERATIONS=10

# Parse arguments
while [[ $# -gt 0 ]]; do
    case $1 in
        --benchmarks)
            BENCHMARKS="$2"
            shift 2
            ;;
        --profiles)
            PROFILES="$2"
            shift 2
            ;;
        --output)
            OUTPUT="$2"
            shift 2
            ;;
        --warmup)
            WARMUP="$2"
            shift 2
            ;;
        --iterations)
            ITERATIONS="$2"
            shift 2
            ;;
        *)
            echo "Unknown option: $1"
            echo "Usage: $0 [--benchmarks critical|all] [--profiles release|all] [--output FILE] [--warmup N] [--iterations N]"
            exit 1
            ;;
    esac
done

echo "=== Certeza Benchmarking Suite ==="
echo "Benchmarks: $BENCHMARKS"
echo "Profiles: $PROFILES"
echo "Output: $OUTPUT"
echo "Warmup runs: $WARMUP"
echo "Measured iterations: $ITERATIONS"
echo ""

# Create output directory
mkdir -p "$(dirname "$OUTPUT")"

# Check for benchmarking tools
if command -v bashrs &> /dev/null; then
    BENCH_TOOL="bashrs"
    echo "Using bashrs for statistical benchmarking"
elif command -v hyperfine &> /dev/null; then
    BENCH_TOOL="hyperfine"
    echo "Using hyperfine as fallback (bashrs not found)"
else
    echo "Error: Neither bashrs nor hyperfine found. Please install one of:"
    echo "  cargo install bashrs"
    echo "  cargo install hyperfine"
    exit 1
fi

echo ""

# Generate reproducibility manifest
echo "Generating reproducibility manifest..."
./scripts/generate_reproducibility_manifest.sh benchmarks/metadata/toolchain_manifest.txt

# Build benchmarks in release mode
echo ""
echo "Building benchmarks in release mode..."
cargo build --release --locked

echo ""
echo "=== Running Benchmarks ==="
echo ""

# For now, create a placeholder JSON structure
# In a full implementation, this would run actual benchmarks and collect results
cat > "$OUTPUT" <<EOF
{
  "schema_version": "1.0",
  "metadata": {
    "benchmark_suite": "certeza-benchmarks",
    "timestamp": "$(date -Iseconds)",
    "git_commit": "$(git rev-parse --short HEAD 2>/dev/null || echo 'unknown')",
    "git_branch": "$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo 'unknown')",
    "operator": "automated-ci",
    "benchmarking_tool": "$BENCH_TOOL",
    "warmup_runs": $WARMUP,
    "measured_runs": $ITERATIONS
  },
  "benchmarks": [],
  "summary": {
    "total_benchmarks": 0,
    "successful": 0,
    "failed": 0,
    "total_runtime_seconds": 0.0,
    "significant_improvements": 0,
    "significant_regressions": 0
  }
}
EOF

echo "Benchmark execution complete!"
echo "Results written to: $OUTPUT"
echo ""
echo "Note: This is a placeholder implementation for Phase 3.2"
echo "Full benchmark integration will be added in subsequent phases."