#!/usr/bin/env bash
# check-coverage-thresholds.sh — Enforce minimum test coverage for critical packages.
#
# Runs `go test -cover` on specified packages and fails if any package
# drops below its defined minimum coverage threshold.
#
# Usage: scripts/check-coverage-thresholds.sh

set -euo pipefail

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

log() {
  printf '[coverage] %s\n' "$*"
}

err() {
  printf '[coverage] FAIL: %s\n' "$*" >&2
}

# Package thresholds: "package_path:minimum_percent"
# Set ~2% below current values to catch regressions without blocking on noise.
THRESHOLDS=(
  "internal/sync:70"
  "internal/storage:60"
  "internal/service:50"
  "internal/service/conversion:80"
  "internal/cli:30"
  "internal/model:40"
)

failures=0
passes=0

for entry in "${THRESHOLDS[@]}"; do
  pkg="${entry%%:*}"
  threshold="${entry##*:}"

  # Run go test with coverage and extract percentage
  output=$(go test -cover "./$pkg" 2>&1) || {
    err "$pkg — tests failed"
    failures=$((failures + 1))
    continue
  }

  # Extract coverage percentage (e.g., "coverage: 72.1% of statements")
  coverage=$(echo "$output" | grep -oE 'coverage: [0-9]+\.[0-9]+%' | grep -oE '[0-9]+\.[0-9]+' || echo "0.0")

  if [[ -z "$coverage" || "$coverage" == "0.0" ]]; then
    # Package might have no test files or no statements
    if echo "$output" | grep -q '\[no test files\]'; then
      err "$pkg — no test files (threshold: ${threshold}%)"
      failures=$((failures + 1))
    else
      err "$pkg — could not determine coverage (threshold: ${threshold}%)"
      failures=$((failures + 1))
    fi
    continue
  fi

  # Compare using awk for floating-point comparison
  passed=$(awk "BEGIN { print ($coverage >= $threshold) ? 1 : 0 }")

  if [[ "$passed" -eq 1 ]]; then
    log "$pkg: ${coverage}% >= ${threshold}% threshold"
    passes=$((passes + 1))
  else
    err "$pkg: ${coverage}% < ${threshold}% threshold"
    failures=$((failures + 1))
  fi
done

echo ""
log "Results: ${passes} passed, ${failures} failed (${#THRESHOLDS[@]} packages checked)"

if [[ "$failures" -gt 0 ]]; then
  err "Coverage threshold check failed."
  exit 1
fi

log "All coverage thresholds met."
exit 0