#!/usr/bin/env bash
# Shared setup; sourced by build.sh and preview.sh.
set -euo pipefail
repo_root="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
usage() {
  echo "Usage: $0 [--force|-f] [document.typ | report-directory]"
  echo "Defaults to reports/respuesta-observaciones-avance-1/main.typ. Relative paths use the current directory."
  echo "Existing PDFs are preserved unless --force is given. Preview watches only with --force."
}
force=false
input=""
while [[ $# -gt 0 ]]; do
  case "$1" in
    --force|-f) force=true ;;
    --help|-h) usage; exit 0 ;;
    -*) echo "Error: unknown option: $1" >&2; usage >&2; exit 2 ;;
    *)
      if [[ -n "$input" ]]; then usage >&2; exit 2; fi
      input="$1"
      ;;
  esac
  shift
done
input="${input:-$repo_root/reports/respuesta-observaciones-avance-1/main.typ}"
if [[ -d "$input" ]]; then input="$input/main.typ"; fi
if [[ ! -f "$input" || "$input" != *.typ ]]; then
  echo "Error: expected an existing .typ file: $input" >&2
  exit 1
fi
input="$(realpath -- "$input")"
case "$input" in
  "$repo_root/template/"*)
    echo "Error: las plantillas no generan PDF; copie el documento base a reports/ primero." >&2
    exit 1
    ;;
esac
name="$(basename -- "$input" .typ)"
if [[ "$name" == main ]]; then
  name="$(basename -- "$(cd -- "$(dirname -- "$input")" && pwd)")"
fi
output="$repo_root/pdf/$name.pdf"

require_typst() {
  command -v typst >/dev/null 2>&1 || {
    echo "Error: install Typst and make it available on PATH." >&2
    exit 1
  }
}

build_pdf() {
  if [[ -e "$output" && "$force" == false ]]; then
    printf 'PDF existente: %s (use --force para regenerar)\n' "$output"
    return
  fi
  require_typst
  mkdir -p -- "$repo_root/pdf"
  typst compile --root "$repo_root" "$input" "$output"
  printf 'PDF: %s\n' "$output"
}