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

ROOT="$(git rev-parse --show-toplevel)"
CONFIG_PATH="${ROOT}/files/config/runtime-edge-coverage-domains.json"
DEFAULT_REPORT="${ROOT}/target/llvm-cov/report.json"

usage() {
  cat <<'EOF'
Usage:
  coverage-domain-evidence.sh --list
  coverage-domain-evidence.sh <domain> [report.json]

The report path defaults to target/llvm-cov/report.json and is expected to be
generated by `make ci` or `make coverage-report-json`.
EOF
}

if [[ ! -f "${CONFIG_PATH}" ]]; then
  echo "missing coverage domain config: ${CONFIG_PATH}" >&2
  exit 1
fi

if [[ $# -eq 0 ]]; then
  usage
  exit 1
fi

if [[ "$1" == "--list" ]]; then
  jq -r '.domains | keys[]' "${CONFIG_PATH}"
  exit 0
fi

DOMAIN="$1"
REPORT_PATH="${2:-${DEFAULT_REPORT}}"

if ! jq -e --arg domain "${DOMAIN}" '.domains[$domain]' "${CONFIG_PATH}" >/dev/null; then
  echo "unknown domain: ${DOMAIN}" >&2
  echo "available domains:" >&2
  jq -r '.domains | keys[]' "${CONFIG_PATH}" >&2
  exit 1
fi

BASELINE="$(jq -r --arg domain "${DOMAIN}" '.domains[$domain].baseline_percent' "${CONFIG_PATH}")"

echo "Runtime edge coverage evidence"
echo "Domain: ${DOMAIN}"
echo "Baseline percent: ${BASELINE}"
echo

echo "Mapped repository paths:"
jq -r --arg domain "${DOMAIN}" '.domains[$domain].paths[]' "${CONFIG_PATH}" | while IFS= read -r prefix; do
  echo "  - ${prefix}"
done
echo

echo "Tracked files present in repository:"
while IFS= read -r path; do
  (
    cd "${ROOT}"
    rg --files . | sed 's#^\./##'
  ) | rg "^${path//\//\\/}" || true
done < <(jq -r --arg domain "${DOMAIN}" '.domains[$domain].paths[]' "${CONFIG_PATH}")
echo

if [[ ! -f "${REPORT_PATH}" ]]; then
  echo "Coverage report not found: ${REPORT_PATH}"
  echo "Generate it with: make coverage-report-json"
  exit 0
fi

jq -r --arg domain "${DOMAIN}" --arg root "${ROOT}" '
  .domains[$domain].paths as $paths
  | def matches_domain:
      . as $file
      | any($paths[]; . as $p | ($file.filename | startswith($root + "/" + $p) or startswith("./" + $p) or startswith($p)));
  def pct($covered; $count):
      if $count > 0 then (($covered * 10000 / $count | floor) / 100) else 0 end;
  reduce (
    input.data[]?.files[]?
    | select(matches_domain)
  ) as $file (
    {
      files: [],
      lines: {count: 0, covered: 0},
      functions: {count: 0, covered: 0},
      regions: {count: 0, covered: 0}
    };
    .files += [$file.filename]
    | .lines.count += ($file.summary.lines.count // 0)
    | .lines.covered += ($file.summary.lines.covered // 0)
    | .functions.count += ($file.summary.functions.count // 0)
    | .functions.covered += ($file.summary.functions.covered // 0)
    | .regions.count += ($file.summary.regions.count // 0)
    | .regions.covered += ($file.summary.regions.covered // 0)
  )
  | "Coverage summary from " + $domain + ":",
    "  files_in_report: " + (.files | length | tostring),
    "  lines: " + (pct(.lines.covered; .lines.count) | tostring) + "% (" + (.lines.covered|tostring) + "/" + (.lines.count|tostring) + ")",
    "  functions: " + (pct(.functions.covered; .functions.count) | tostring) + "% (" + (.functions.covered|tostring) + "/" + (.functions.count|tostring) + ")",
    "  regions: " + (pct(.regions.covered; .regions.count) | tostring) + "% (" + (.regions.covered|tostring) + "/" + (.regions.count|tostring) + ")",
    "",
    "Matched report files:",
    (.files[]? | "  - " + .)
' "${CONFIG_PATH}" "${REPORT_PATH}"