#!/usr/bin/env bash
# Shared functions for retention-cleanup.sh
# Can be sourced by tests for unit testing

age_days() {
  local published="$1" epoch_pub now
  epoch_pub=$(date -d "$published" +%s 2>/dev/null || date -j -f "%Y-%m-%dT%H:%M:%SZ" "$published" +%s 2>/dev/null || echo 0)
  [ "$epoch_pub" -eq 0 ] && echo 99999 && return
  now=$(date -u +%s)
  echo $(( (now - epoch_pub) / 86400 ))
}

parse_path() {
  local rel="$1"
  OWNER="${rel%%/*}"
  rest="${rel#*/}"
  REPO="${rest%%/*}"
}

read_rule() {
  local config="$1" branch="$2" key="$3" default="$4"
  v=$(jq -r --arg b "$branch" --arg k "$key" '.branches[$b][$k] // empty' "$config")
  [ -n "$v" ] && echo "$v" || echo "$default"
}

# Phase 3: apply retention rules to KEEP array, populate TO_DELETE
# Reads from global KEEP array
# Populates global TO_DELETE array
# Usage: apply_retention <config_path>
apply_retention() {
  local config="$1"
  local default_max_age default_keep_min
  local max_age keep_min key count seen_key commit_dir report_type path
  local entry dir owner repo branch days

  default_max_age=$(jq -r '.branches.default.maxAgeDays // 90' "$config")
  default_keep_min=$(jq -r '.branches.default.keepMin // 5' "$config")

  TO_DELETE=()
  declare -A BRANCH_COUNTS
  declare -A SEEN_COMMITS
  declare -A DELETED_COMMITS

  if [ "${#KEEP[@]}" -eq 0 ]; then
    return
  fi

  IFS=$'\n'
  for entry in $(printf '%s\n' "${KEEP[@]}" | sort -t'|' -k4,4 -k5,5n); do
    IFS='|' read -r dir owner repo branch days <<< "$entry"

    max_age=$(read_rule "$config" "$branch" "maxAgeDays" "$default_max_age")
    keep_min=$(read_rule "$config" "$branch" "keepMin" "$default_keep_min")

    # Age check — per-report-type deletion
    if [ "$days" -gt "$max_age" ]; then
      echo "  DELETE: ${dir} (age ${days}d > maxAge ${max_age}d, branch ${branch})"
      TO_DELETE+=("$dir")
      continue
    fi

    # keepMin — per-commit counting
    commit_dir=$(dirname "$dir")
    key="$branch"
    seen_key="${key}|${commit_dir}"

    if [ -z "${SEEN_COMMITS[$seen_key]:-}" ]; then
      SEEN_COMMITS["$seen_key"]=1
      count="${BRANCH_COUNTS[$key]:-0}"
      count=$((count + 1))
      BRANCH_COUNTS["$key"]=$count
    else
      count="${BRANCH_COUNTS[$key]:-0}"
    fi

    if [ "$count" -gt "$keep_min" ]; then
      if [ -z "${DELETED_COMMITS[$commit_dir]:-}" ]; then
        DELETED_COMMITS[$commit_dir]=1
        report_type="${dir##*/}"
        echo "  DELETE: ${commit_dir} (kept ${keep_min}/${count} commits, exceeds keepMin, branch ${branch})"
        TO_DELETE+=("$commit_dir")
      fi
    fi
  done
  unset IFS
}