#!/usr/bin/env miaou-bash

function array_new {
  ref_name="$1"
  shift
  [[ -v nested_count ]] && ((nested_count++)) || nested_count=1
  nested_name="nested_$nested_count"
  declare -ga "$nested_name"
  declare -gn "$ref_name"="$nested_name"
  local -n internal="$nested_name"
  internal+=("$@")
}

function array_inspect {
  local -n ref="$1"
  prefix="${2:-}"
  echo "${prefix}array '$1' contains ${#ref[@]} elements"
  local i
  for i in "${ref[@]}"; do echo "${prefix}-> $i"; done
  echo "${prefix}----"
}

function nested_new {
  local internal
  ref_name="$1"
  shift
  [[ -v nested_count ]] && ((nested_count++)) || nested_count=1
  nested_name="nested_$nested_count"
  declare -gA "$nested_name"
  declare -gn "$ref_name"="$nested_name"
  declare -n internal="$nested_name"
  internal['TYPE']='NESTED_ARRAY'
  local i=0
  local j=0
  for j in "$@"; do
    internal["$i"]="$j"
    i=$((i + 1))
  done
}

function nested_inspect {
  local internal
  declare -n internal=$1
  [[ "${internal['TYPE']}" != 'NESTED_ARRAY' ]] && >&2 echo "expected nested array: $1" && return 1

  count=${#internal[@]}
  count=$((count - 1))
  echo "nested '$1' contains $count arrays"
  local i
  for ((i = 0; i < count; i++)); do
    array_inspect "${internal[$i]}" "  =>  "
  done
  echo ----
}

# initialization
array_new mine1 'Albert' 20
array_new mine2 'Bob' 24
array_new mine3 'Cobra' 31 true

# change values
mine1+=(false)
: "$mine3" # pseudo use fix shellcheck issue
mine3[2]=false

nested_new nested1 mine1 mine2 mine3
nested_inspect nested1

# change nested values
declare -n first="${nested1[0]:?}" # ':?' fix shellcheck issue
first+=("nope")
first[1]=$((first[1] + 5))
nested_inspect nested1