#!/usr/bin/env bash
set -euo pipefail

# CASAN Level 5 business KPI feedback report.
# Usage:
#   business-kpi-report.sh <input-json> <output-json>

INPUT_JSON="${1:-}"
OUTPUT_JSON="${2:-}"
if [[ -z "$INPUT_JSON" || -z "$OUTPUT_JSON" ]]; then
  echo "Usage: business-kpi-report.sh <input-json> <output-json>" >&2
  exit 64
fi

mkdir -p "$(dirname "$OUTPUT_JSON")"

python - "$INPUT_JSON" "$OUTPUT_JSON" <<'PY'
import json
import sys
from datetime import datetime, timezone

input_path, output_path = sys.argv[1], sys.argv[2]
data = json.load(open(input_path, encoding="utf-8"))
results = []
for item in data["kpis"]:
    baseline = float(item["baseline"])
    current = float(item["current"])
    target = float(item["target"])
    direction = item.get("direction", "lower_is_better")
    if direction == "lower_is_better":
        improvement = (baseline - current) / baseline if baseline else 0
        target_met = current <= target
    else:
        improvement = (current - baseline) / baseline if baseline else 0
        target_met = current >= target
    results.append({
        "id": item["id"],
        "baseline": baseline,
        "current": current,
        "target": target,
        "improvement_ratio": round(improvement, 4),
        "target_met": target_met,
    })

report = {
    "timestamp": datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ"),
    "harness": "L5-business-feedback",
    "status": "pass" if all(r["target_met"] for r in results) else "warn",
    "kpis": results,
}
json.dump(report, open(output_path, "w", encoding="utf-8"), indent=2)
print(f"KPI_REPORT status={report['status']} output={output_path}")
PY