#!/usr/bin/env zsh
set -euo pipefail

execute=false
if [[ ${1:-} == '--execute' ]]; then
  execute=true
  shift
fi

if [[ $# -gt 0 ]]; then
  print -u2 'Usage: rename-iso-title.zsh [--execute]'
  exit 2
fi

# Requires Obsidian app running and CLI enabled.
: ${OBSIDIAN_CLI:=obsidian}

files=(c-[0-9]*\.md(N))
if (( ${#files} == 0 )); then
  print 'No matching files found.'
  exit 0
fi

for src in "$files[@]"; do
  base=${src:t}

  # Read the level 1 header from the file
  # Format: # <number> <title>
  # Extract everything after the first number and space
  header=$(head -n 1 "$src" | sed 's/^# [0-9.]* //')
  
  if [[ -z "$header" ]]; then
    print -u2 "WARN  skipped (no header found): $src"
    continue
  fi

  # Clean up the title
  title=$header
  # Replace spaces with dashes
  title=${title// /-}
  # Remove commas, slashes, parentheses, quotes
  title=${title//,/}
  title=${title//\//}
  title=${title//\\/}
  title=${title//\(}
  title=${title//\)}
  title=${title//\'}
  title=${title//\'}
  # Replace diacritics with base characters
  title=${title//ï/i}
  title=${title//é/e}
  title=${title//è/e}
  title=${title//ê/e}
  title=${title//ë/e}
  title=${title//ö/o}
  title=${title//ü/u}
  title=${title//ó/o}
  title=${title//ô/o}
  title=${title//á/a}
  title=${title//à/a}
  title=${title//ã/a}
  title=${title//ä/a}
  title=${title//í/i}
  title=${title//ì/i}
  title=${title//ñ/n}
  title=${title//ú/u}
  title=${title//ù/u}
  # Remove multiple dashes
  title=${title//---/-}
  title=${title//--/-}
  # Remove leading/trailing dashes
  title=${title#-}
  title=${title%-}

  # Build new filename: c-n.n-TITLE.md
  ext="${src:r}.md"  # extension without the extra .md issue
  filename="${src%.*}"
  target="${filename}-${title}.md"

  if [[ $src == $target ]]; then
    print "SKIP  $src"
    continue
  fi

  print "SRC   $src"
  print "DEST  $target"
  if $execute; then
    "$OBSIDIAN_CLI" rename file="$src" name="$target"
  fi
done