# shellcheck shell=bash
# Release age helpers for Android wallet matrix.
# Source after ROOT/lib_android_env.sh (optional).
#
# BLOCKER only when a *released* app is within BLOCKER_MAX_AGE_DAYS (default 14).
# Older releases: try them, but failures are WARN only.

: "${BLOCKER_MAX_AGE_DAYS:=14}"
: "${TALER_ANDROID_SRC:=$HOME/taler/taler-android}"

# Days since git tag (tagger/committer date). Empty if unknown.
# Usage: release_age_days wallet-1.6.1  → e.g. 28
release_age_days() {
  local tag="$1"
  local src="${2:-$TALER_ANDROID_SRC}"
  [ -d "$src/.git" ] || return 1
  local epoch
  epoch=$(git -C "$src" log -1 --format=%ct "refs/tags/${tag}" 2>/dev/null || true)
  [ -n "$epoch" ] || epoch=$(git -C "$src" log -1 --format=%ct "$tag" 2>/dev/null || true)
  [ -n "$epoch" ] || return 1
  local now
  now=$(date +%s)
  echo $(( (now - epoch) / 86400 ))
}

# severity from age: blocker if age_days <= BLOCKER_MAX_AGE_DAYS, else warn
# Unknown age → warn (never accidental hard fail on mystery builds)
severity_from_age_days() {
  local days="${1:-}"
  if [ -z "$days" ] || ! [[ "$days" =~ ^[0-9]+$ ]]; then
    echo warn
    return
  fi
  if [ "$days" -le "${BLOCKER_MAX_AGE_DAYS}" ]; then
    echo blocker
  else
    echo warn
  fi
}

severity_for_tag() {
  local tag="$1"
  local days
  days=$(release_age_days "$tag" 2>/dev/null || true)
  severity_from_age_days "$days"
}

# List wallet-* release tags newest first (exclude rc/dev).
# Args: max count (default 5). Pass 0 or "all" for no limit.
list_wallet_release_tags() {
  local n="${1:-5}"
  local src="${TALER_ANDROID_SRC:-$HOME/taler/taler-android}"
  [ -d "$src/.git" ] || return 1
  git -C "$src" fetch --tags origin 2>/dev/null || true
  local cmd=(git -C "$src" for-each-ref --sort=-creatordate --format='%(refname:short)' refs/tags)
  if [ "$n" = "all" ] || [ "$n" = "0" ]; then
    "${cmd[@]}" | grep -E '^wallet-[0-9]+\.[0-9]+(\.[0-9]+)?$'
  else
    "${cmd[@]}" | grep -E '^wallet-[0-9]+\.[0-9]+(\.[0-9]+)?$' | head -n "$n"
  fi
}

# Pick one tag closest to each age milestone (days). Always intended as WARN samples.
# Default milestones: 3,6,9,12 months ≈ 90,180,270,365 days.
# Env: MILESTONE_DAYS="90 180 270 365"  MILESTONE_TOLERANCE_DAYS=50
# Prints lines: TAG AGE_DAYS TARGET_DAYS  (only when a tag within tolerance exists)
select_milestone_tags() {
  local src="${TALER_ANDROID_SRC:-$HOME/taler/taler-android}"
  local milestones="${MILESTONE_DAYS:-90 180 270 365}"
  local tol="${MILESTONE_TOLERANCE_DAYS:-50}"
  local skip="${1:-}"   # optional tag to exclude (e.g. current STABLE_TAG)
  local -a tags=()
  mapfile -t tags < <(list_wallet_release_tags all 2>/dev/null || true)
  [ "${#tags[@]}" -gt 0 ] || return 0

  local target best_tag best_age best_delta age t delta
  local -A used=()
  for target in $milestones; do
    best_tag=""
    best_age=""
    best_delta=99999
    for t in "${tags[@]}"; do
      [ -n "$t" ] || continue
      [ "$t" = "$skip" ] && continue
      [ -n "${used[$t]:-}" ] && continue
      age=$(release_age_days "$t" "$src" 2>/dev/null || true)
      [[ "$age" =~ ^[0-9]+$ ]] || continue
      delta=$(( age > target ? age - target : target - age ))
      if [ "$delta" -le "$tol" ] && [ "$delta" -lt "$best_delta" ]; then
        best_delta=$delta
        best_tag=$t
        best_age=$age
      fi
    done
    if [ -n "$best_tag" ]; then
      used[$best_tag]=1
      echo "$best_tag $best_age $target"
    fi
  done
}

# Guess F-Droid APK URL for a wallet version name (e.g. 1.6.1).
# Uses versionCode from tag's build.gradle if possible, else STABLE mapping.
# Prints: versionCode apk_url  or returns 1
fdroid_apk_for_version_name() {
  local vn="$1"   # 1.6.1
  local src="${TALER_ANDROID_SRC:-$HOME/taler/taler-android}"
  local tag="wallet-${vn}"
  local vc=""
  if git -C "$src" cat-file -e "refs/tags/${tag}:wallet/build.gradle" 2>/dev/null; then
    vc=$(git -C "$src" show "refs/tags/${tag}:wallet/build.gradle" 2>/dev/null \
      | sed -n 's/^[[:space:]]*versionCode[[:space:]]\+\([0-9]\+\).*/\1/p' | head -1)
  fi
  # ABI x86_64 → +4 in override scheme 10*vc+abi (common F-Droid multi-apk)
  # Prefer universal-style code used by F-Droid: for 1.6.1 → 854 = 10*85+4
  local apk_vc=""
  if [ -n "$vc" ]; then
    apk_vc=$((10 * vc + 4))
  fi
  # Known overrides / suggested
  case "$vn" in
    1.6.1) apk_vc=854 ;;
  esac
  [ -n "$apk_vc" ] || return 1
  echo "${apk_vc}|https://f-droid.org/repo/net.taler.wallet.fdroid_${apk_vc}.apk"
}

# Check HTTP HEAD/GET that APK exists (0 = ok)
fdroid_apk_exists() {
  local url="$1"
  curl -sfS -m 15 -o /dev/null -r 0-0 "$url" 2>/dev/null \
    || curl -sfS -m 15 -o /dev/null -I "$url" 2>/dev/null
}