#!/usr/bin/env bash
# batch-pdf.sh - Convert all Markdown docs to professional PDFs via Pandoc + WeasyPrint
# Usage: bash scripts/batch-pdf.sh [directory]
# Default directory: docs/
#
# Pipeline:  pandoc md → HTML  →  weasyprint CSS → PDF
# Requires:  pandoc, weasyprint, CSS file at docs/pdf-comparison/cheatsheet.css

set -euo pipefail

PROJ_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
CSS_PATH="${PROJ_ROOT}/docs/pdf-comparison/cheatsheet.css"
DOC_DIR="${1:-${PROJ_ROOT}/docs}"
OUTPUT_DIR="${PROJ_ROOT}/docs/pdf-output"

# Verify dependencies
for cmd in pandoc weasyprint; do
  command -v "$cmd" &>/dev/null || { echo "ERROR: $cmd not found. Install: sudo pacman -S $cmd"; exit 1; }
done
[[ -f "$CSS_PATH" ]] || { echo "ERROR: CSS not found at $CSS_PATH"; exit 1; }

mkdir -p "${OUTPUT_DIR}"
count=0
errors=0
tmpdir=$(mktemp -d)

echo "=== Markdown → PDF Batch (Pandoc + WeasyPrint + CSS) ==="
echo "CSS:      ${CSS_PATH}"
echo "Input:    ${DOC_DIR}"
echo "Output:   ${OUTPUT_DIR}"
echo ""

find "${DOC_DIR}" -name "*.md" -not -path "*/pdf-output/*" -not -path "*/.*" -not -name "hyprland-keybindings-no-meta.md" | sort | while read -r md_file; do
  rel_path="${md_file#${DOC_DIR}/}"
  rel_dir="$(dirname "${rel_path#${DOC_DIR#${PROJ_ROOT}/}/}")"
  basename="$(basename "${md_file}" .md)"
  title="${basename//-/ }"

  out_subdir="${OUTPUT_DIR}"
  if [[ "${rel_dir}" != "." && -n "${rel_dir}" ]]; then
    out_subdir="${OUTPUT_DIR}/${rel_dir}"
  fi
  mkdir -p "${out_subdir}"

  html_file="${tmpdir}/${basename}.html"
  pdf_file="${out_subdir}/${basename}.pdf"

  echo "  ${rel_path} ..."

  pandoc "${md_file}" -t html5 --standalone \
    --css "file://${CSS_PATH}" \
    --metadata title="${title}" \
    -o "${html_file}" 2>&1 || { echo "    PANDOC ERROR"; errors=$((errors+1)); continue; }

  weasyprint "${html_file}" "${pdf_file}" 2>/dev/null || \
    weasyprint "${html_file}" "${pdf_file}" 2>&1 | head -1

  if [[ -f "${pdf_file}" ]]; then
    size=$(du -h "${pdf_file}" | cut -f1)
    echo "    OK (${size})"
    count=$((count + 1))
  else
    echo "    PDF GENERATION ERROR"
    errors=$((errors + 1))
  fi
done

rm -rf "${tmpdir}"

echo ""
done_count=$(find "${OUTPUT_DIR}" -name "*.pdf" | wc -l)
echo "=== Done: ${done_count} files in ${OUTPUT_DIR} ==="