#!/usr/bin/env bash
# Coverage gate — fails if total line coverage drops below the
# `coverage_floor:` value in pubspec.yaml. Driven by D-66.
#
# Reads coverage/lcov.info (generated by `flutter test --coverage`,
# which `ci/test.sh` runs as part of the fast suite). Parses the
# total LF/LH counts and compares the integer percentage against
# the floor. The floor only ratchets up — bumping it requires an
# explicit edit to pubspec.yaml committed alongside the test
# additions that earned the bump.
#
# Self-contained parser (awk) — does not depend on `lcov` being
# installed on the dev machine.
set -euo pipefail
cd "$(dirname "$0")/.."

LCOV=coverage/lcov.info

if [[ ! -f "$LCOV" ]]; then
  echo "==> coverage gate: $LCOV missing — run \`make test\` first (it writes lcov)" >&2
  exit 2
fi

floor=$(awk -F: '/^coverage_floor:/ {gsub(/ /,"",$2); print $2; exit}' pubspec.yaml)
if [[ -z "$floor" ]]; then
  echo "==> coverage gate: pubspec.yaml is missing coverage_floor: — see D-66" >&2
  exit 2
fi
read measured measured_int < <(
  awk -F: '
    /^LF:/ { lf += $2 }
    /^LH:/ { lh += $2 }
    END {
      pct = (lh / lf) * 100
      printf "%.2f %d\n", pct, int(pct)
    }
  ' "$LCOV"
)

if (( measured_int < floor )); then
  echo "==> coverage gate FAIL: ${measured}% < floor ${floor}%"
  echo "    Add tests, or — if the drop is intentional — explain in the commit and lower the floor explicitly."
  exit 1
fi

if (( measured_int > floor )); then
  echo "==> coverage gate OK: ${measured}% (floor ${floor}%) — ${measured_int}% available; consider bumping pubspec.yaml coverage_floor: to ${measured_int}"
else
  echo "==> coverage gate OK: ${measured}% (floor ${floor}%)"
fi