#!/usr/bin/env bash
# Module: template
# Description: Genera archivos a partir de plantillas con variables {{var}}, bucles, includes y delimitadores configurables
# Author: Luis GuLo
# Version: 0.4.0
# Dependencies: bash, sed, tee, grep, cat

# 🧭 Detección de raíz del proyecto
PROJECT_ROOT="${SHFLOW_HOME:-$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)}"
TEMPLATE_DIR="$PROJECT_ROOT/core/templates"

template_task() {
  local host="$1"; shift
  declare -A args
  local start_delim="{{" end_delim="}}" strict="false"
  declare -A vars

  # 🌐 Cargar traducciones
  local lang="${shflow_vars[language]:-es}"
  local trfile="$(dirname "${BASH_SOURCE[0]}")/template.tr.${lang}"
  declare -A tr
  if [[ -f "$trfile" ]]; then
    while IFS='=' read -r k v; do tr["$k"]="$v"; done < "$trfile"
  fi

  # Parsear argumentos
  for arg in "$@"; do
    key="${arg%%=*}"
    value="${arg#*=}"
    case "$key" in
      src) src="$value" ;;
      dest) dest="$value" ;;
      become) become="$value" ;;
      delimiters)
        start_delim="${value%% *}"
        end_delim="${value#* }"
        ;;
      strict) strict="$value" ;;
      *) vars["$key"]="$value" ;;
    esac
  done

  local prefix=""
  [ "$become" = "true" ] && prefix="sudo"

  local template_path="$TEMPLATE_DIR/$src"
  [[ ! -f "$template_path" ]] && echo "$(render_msg "${tr[missing_template]}" "path=$template_path")" && return 1

  local rendered=""
  local line loop_active="false" loop_key="" loop_buffer=()

  while IFS= read -r line || [[ -n "$line" ]]; do
    if [[ "$line" =~ ${start_delim}[[:space:]]*include[[:space:]]*\"([^\"]+)\"[[:space:]]*${end_delim} ]]; then
      include_file="${BASH_REMATCH[1]}"
      include_path="$TEMPLATE_DIR/$include_file"
      [[ -f "$include_path" ]] && rendered+=$(cat "$include_path")$'\n'
      continue
    fi

    if [[ "$line" =~ ^#LOOP[[:space:]]+([a-zA-Z0-9_]+)$ ]]; then
      loop_active="true"
      loop_key="${BASH_REMATCH[1]}"
      loop_buffer=()
      continue
    fi

    if [[ "$line" == "#ENDLOOP" ]]; then
      loop_active="false"
      IFS=',' read -r -a items <<< "${vars[$loop_key]}"
      for item in "${items[@]}"; do
        for loop_line in "${loop_buffer[@]}"; do
          rendered+=$(replace_vars "$loop_line" "$item" "$start_delim" "$end_delim")$'\n'
        done
      done
      continue
    fi

    if [[ "$loop_active" == "true" ]]; then
      loop_buffer+=("$line")
      continue
    fi

    rendered+=$(replace_vars "$line" "" "$start_delim" "$end_delim")$'\n'
  done < "$template_path"

  if [[ "$strict" == "true" ]]; then
    missing=$(echo "$rendered" | grep -o "${start_delim}[^${end_delim}]*${end_delim}" | sort -u)
    if [[ -n "$missing" ]]; then
      echo "${tr[missing_vars]:-❌ [template] Variables no definidas:}"
      echo "$missing"
      return 1
    fi
  fi

  echo "$rendered" | $prefix tee "$dest" > /dev/null
  echo "$(render_msg "${tr[generated]}" "dest=$dest")"
}

replace_vars() {
  local line="$1"
  local item="$2"
  local start_delim="$3"
  local end_delim="$4"
  for key in "${!vars[@]}"; do
    line="${line//${start_delim}${key}${end_delim}/${vars[$key]}}"
  done
  [[ -n "$item" ]] && line="${line//${start_delim}item${end_delim}/$item}"
  echo "$line"
}

check_dependencies_template() {
  local lang="${shflow_vars[language]:-es}"
  local trfile="$(dirname "${BASH_SOURCE[0]}")/template.tr.${lang}"
  declare -A tr
  if [[ -f "$trfile" ]]; then
    while IFS='=' read -r k v; do tr["$k"]="$v"; done < "$trfile"
  fi

  local missing=()
  for cmd in sed tee grep cat; do
    command -v "$cmd" >/dev/null 2>&1 || missing+=("$cmd")
  done

  if [[ ${#missing[@]} -gt 0 ]]; then
    echo "$(render_msg "${tr[missing_deps]}" "cmds=${missing[*]}")"
    return 1
  fi

  echo "${tr[deps_ok]:-✅ [template] Todas las dependencias están disponibles}"
  return 0
}