#!/usr/bin/env bash

# ███        ███        ███        ███
# █ █        █ █         █         ██
# █ █        ███         █         ███

# note
# needs: fzf, rg

# written mostly by chatgpt and deepseek (ai) in april 2026
# agentic engineer: brontosaurusrex

set -euo pipefail
# set -x

NOTES_DIR="${NOTES_DIR:-$HOME/notes}"

# try multiple editors
for ed in "${EDITOR:-}" hx vim nano; do
    if command -v "$ed" >/dev/null 2>&1; then
        EDITOR="$ed"
        break
    fi
done

export FZF_DEFAULT_OPTS="--pointer='>' --color=fg:-1,bg:-1,hl:-1,fg+:-1,bg+:-1,hl+:-1,info:-1,prompt:-1,spinner:-1,pointer:-1,marker:-1,border:-1"

# deps
for cmd in fzf rg; do
  if ! command -v "$cmd" &>/dev/null; then
    echo "Error: $cmd is required" >&2
    exit 1
  fi
done

mkdir -p "$NOTES_DIR"

today() {
  date +"%Y-%m-%d"
}

slugify() {
  local input="${1:-}"

  input="$(
    echo "$input" \
      | tr '[:upper:]' '[:lower:]' \
      | tr -cd 'a-z0-9 -' \
      | tr ' ' '-' \
      | sed 's/-\+/-/g' \
      | sed 's/^-//' \
      | sed 's/-$//'
  )"

  echo "$input"
}

open_note_fzf() {
  local files

  # shellcheck disable=SC2016
  mapfile -t files < <(
    find "$NOTES_DIR" -maxdepth 1 -type f -name '*.md' \
      -printf '%T@ %f\n' \
    | sort -nr \
    | cut -d' ' -f2- \
    | fzf \
        --prompt="open> " \
        --multi \
        --marker='*' \
        --bind='tab:toggle' \
        --preview='fold -s -w "$FZF_PREVIEW_COLUMNS" "'"$NOTES_DIR"'"/{}' \
        --preview-window=right:50% \
        --height=80% \
        --reverse
  )

  [[ ${#files[@]} -eq 0 ]] && return

  "$EDITOR" "${files[@]/#/$NOTES_DIR/}"
}

search_notes() {
  local query="${1:-}"
  local selection file line

  # shellcheck disable=SC2016
  selection=$(
    rg -i -m1 --no-heading --line-number --color=never "$query" "$NOTES_DIR" \
      | fzf \
          --delimiter : \
          --prompt="search> " \
          --preview='fold -s -w "$FZF_PREVIEW_COLUMNS" {1}' \
          --bind "change:reload:rg -i -m1 --no-heading --line-number --color=never {q} '$NOTES_DIR' || true" \
          --phony \
          --query "$query" \
          --preview-window=right:50% \
          --height=80% \
          --reverse
  )

  [[ -z "$selection" ]] && return

  file="${selection%%:*}"
  line="${selection#*:}"
  line="${line%%:*}"

  "$EDITOR" "$file" "+$line"
}

create_note() {
  local text="$1"
  local title slug file

  [[ -z "$text" ]] && return

  # first line, max 6 words
  title="$(
    printf '%s\n' "$text" \
      | head -n1 \
      | awk '{
          for(i=1;i<=6 && i<=NF;i++)
            printf "%s%s",$i,(i<6 && i<NF?" ":"")
        }'
  )"

  [[ -z "$title" ]] && title="note"

  slug="$(slugify "$title" | cut -d- -f1-5)"
  [[ -z "$slug" ]] && slug="note"

  file="$NOTES_DIR/$(today)-$slug.md"

  if [[ -f "$file" ]]; then
    "$EDITOR" "$file"
    return
  fi

  cat > "$file" <<EOF
---
title: $title
date: $(today)
---
$text
EOF

  "$EDITOR" "$file"
}

new_note() {
  local title slug file

  title="${*:-note}"

  slug="$(slugify "$title" | cut -d- -f1-5)"
  [[ -z "$slug" ]] && slug="note"

  file="$NOTES_DIR/$(today)-$slug.md"

  if [[ -f "$file" ]]; then
    "$EDITOR" "$file"
    return
  fi

  cat > "$file" <<EOF
---
title: $title
date: $(today)
---
EOF

  "$EDITOR" "$file"
}

list_notes() {
  find "$NOTES_DIR" -maxdepth 1 -type f -name '*.md' \
    -printf '%T@ %f\n' \
  | sort -n \
  | cut -d' ' -f2-
}

latest_note() {
  local file

  file=$(
    find "$NOTES_DIR" -maxdepth 1 -type f -name '*.md' \
      -printf '%T@|%p\n' \
    | sort -nr \
    | head -n1 \
    | cut -d'|' -f2-
  )

  [[ -n "$file" ]] || return 1

  printf '%s\n' "$file"
}

cat_note() {
  local query="${1:-}"
  local file=""
  local count

  if [[ "$query" =~ ^[0-9]+$ ]]; then
    count="$query"

    find "$NOTES_DIR" -maxdepth 1 -type f -name '*.md' \
      -printf '%T@|%p\n' \
    | sort -nr \
    | head -n "$count" \
    | cut -d'|' -f2- \
    | while IFS= read -r f; do
        #printf '\n===== %s =====\n\n' "$(basename "$f")"
        cat "$f"
        printf '\n'
      done

    return
  fi

  if [[ -z "$query" ]]; then
    if ! file="$(latest_note)"; then
      echo "No notes found"
      return 1
    fi
  else
    while IFS= read -r f; do
      if [[ "${f,,}" == *"${query,,}"* ]]; then
        file="$f"
        break
      fi
    done < <(
      find "$NOTES_DIR" -maxdepth 1 -type f -name '*.md'
    )
  fi

  [[ -z "$file" ]] && {
    echo "No match found"
    exit 1
  }

  cat "$file"
}

# this is called with cr (cat round) instead of c (cat), needs roundboxPy on path
# https://raw.githubusercontent.com/brontosaurusrex/bucentaur/refs/heads/master/.experiments/bin/roundboxPy
cat_note_roundbox() {
  local query="${1:-}"
  local file=""
  local count

  if [[ "$query" =~ ^[0-9]+$ ]]; then
    count="$query"

    find "$NOTES_DIR" -maxdepth 1 -type f -name '*.md' \
      -printf '%T@|%p\n' \
    | sort -nr \
    | head -n "$count" \
    | cut -d'|' -f2- \
    | while IFS= read -r f; do

        roundboxPy < "$f"
      
      done

    return
  fi

  if [[ -z "$query" ]]; then
    if ! file="$(latest_note)"; then
      echo "No notes found"
      return 1
    fi
  else
    while IFS= read -r f; do
      if [[ "${f,,}" == *"${query,,}"* ]]; then
        file="$f"
        break
      fi
    done < <(
      find "$NOTES_DIR" -maxdepth 1 -type f -name '*.md'
    )
  fi

  [[ -z "$file" ]] && {
    echo "No match found"
    exit 1
  }

  roundboxPy < "$file"

}

open_note() {
  local query="${1:-}"
  local file=""

  if [[ -z "$query" ]]; then
    open_note_fzf
    return
  fi

  while IFS= read -r f; do
    if [[ "${f,,}" == *"${query,,}"* ]]; then
      file="$f"
      break
    fi
  done < <(
    find "$NOTES_DIR" -maxdepth 1 -type f -name '*.md'
  )

  [[ -z "$file" ]] && {
    echo "No match found"
    exit 1
  }

  "$EDITOR" "$file"
}

remove_note() {
  local file trash_dir target

  trash_dir="$NOTES_DIR/.trash"
  mkdir -p "$trash_dir"

  # shellcheck disable=SC2016
  file=$(
    find "$NOTES_DIR" -maxdepth 1 -type f -name '*.md' \
      -printf '%T@ %f\n' \
    | sort -nr \
    | cut -d' ' -f2- \
    | fzf \
        --prompt="trash> " \
        --pointer=">" \
        --color="pointer:red" \
        --preview='fold -s -w "$FZF_PREVIEW_COLUMNS" "'"$NOTES_DIR"'"/{}' \
        --preview-window=right:50% \
        --height=80% \
        --reverse
  )

  [[ -z "$file" ]] && return

  printf "Move '%s' to trash? [y/N] " "$file"
  read -r confirm

  if [[ ! "$confirm" =~ ^[yY]$ ]]; then
    echo "Aborted"
    return
  fi

  target="$trash_dir/$file"

  if [[ -e "$target" ]]; then
    target="$trash_dir/$(date +%s)-$file"
  fi

  mv -- "$NOTES_DIR/$file" "$target"

  echo "Moved to trash: $file"
}

usage() {
  cat <<EOF
Usage:

  note n "title"          → new note with explicit title
  note "text"             → create/reopen note
  note < file.txt         → create note from stdin
  note l                  → list
  note                    → open (fzf) multiple (tab)
  note o                  → open (fzf) multiple (tab)
  note s                  → search (rg|fzf)
  note c                  → cat latest n notes
  note rm                 → move to .trash
  note pull               → git pull
  note push               → git push
  note --longhelp | less  → full help
  note h                  → this help

Storage: $NOTES_DIR
EOF
}

longhelp() {
  cat <<'EOF'
NAME
    note - simple note manager
EOF
}

cmd="${1:-}"

# capture stdin once
stdin_data=""
if [[ ! -t 0 ]]; then
  stdin_data="$(cat)"
fi

case "$cmd" in
  new|+|n)
    shift
    new_note "$@"
    ;;

  list|l)
    list_notes
    ;;

  ""|open|o)
    shift || true

    if [[ -n "$stdin_data" ]]; then
      create_note "$stdin_data"
    else
      open_note "$@"
    fi
    ;;

  remove|rm)
    shift || true
    remove_note "$@"
    ;;

  cat|c)
    shift || true
    cat_note "$@"
    ;;

  cr)
   shift || true
   cat_note_roundbox "$@"
   ;;

  grep|search|g|s)
    shift || true
    search_notes "$@"
    ;;

  h|-h|--help)
    usage
    ;;

  pull)
    git -C "$NOTES_DIR" pull
    ;;

  push)
    git -C "$NOTES_DIR" add . \
      && git -C "$NOTES_DIR" commit -m "note commit" \
      && git -C "$NOTES_DIR" push
    ;;

  *)
    if [[ -n "$stdin_data" ]]; then
      create_note "$stdin_data"
    else
      create_note "$*"
    fi
    ;;
esac