#!/usr/bin/env bash

set -e

projects_dir=$HOME/Projects

# Print the sorted, de-duplicated list of selectable projects.
list_projects() {
  local projects=() dir relative line

  # All depth-2 directories without @ are included unconditionally
  for dir in "$projects_dir"/*/*/; do
    [ -d "$dir" ] || continue
    relative="${dir#$projects_dir/}"
    relative="${relative%/}"
    [[ "$relative" != *@* ]] && projects+=("$relative")
  done

  # For @ directories, only include those with .git
  if command -v fd &>/dev/null; then
    while IFS= read -r line; do
      projects+=("$line")
    done < <(fd -H '^\.git$' "$projects_dir" |
      grep '@' |
      sed -E -e "s|^$projects_dir/||" -e 's|/\.git/?$||')
  else
    while IFS= read -r line; do
      projects+=("$line")
    done < <(find "$projects_dir" \( -name 'node_modules' -o -name '.git' \) \
      -prune -name '.git' -print |
      grep '@' |
      sed -E -e "s|^$projects_dir/||" -e 's|/\.git/?$||')
  fi

  printf '%s\n' "${projects[@]}" | sort -u
}

# Second pass: runs inside the popup. Read the list the first pass already
# built (so the directory scan only happens once) and open the selection.
if [[ "${1:-}" == --pick ]]; then
  listfile=$2
  trap 'rm -f "$listfile"' EXIT

  # Cancelling fzf (Esc/^C) exits non-zero; treat it as "no selection" and
  # leave quietly, rather than letting the status propagate out of the popup
  # and print '...project.sh returned 130' in the parent pane.
  project=$(
    fzf --layout=reverse --info=hidden --border=rounded --cycle < "$listfile"
  ) || exit 0
  [ -n "$project" ] || exit 0

  tmux new-window -n "$project" -c "$projects_dir/$project"
  ~/.local/share/tmux/layouts/window-auto
  exit
fi

# First pass: scan once, size a popup to fit the longest project name, then
# re-launch ourselves inside it. fzf has no width of its own — it fills the
# popup — so the popup width is what we scale.
listfile=$(mktemp)
list_projects > "$listfile"

longest=0
while IFS= read -r line; do
  if (( ${#line} > longest )); then
    longest=${#line}
  fi
done < "$listfile"

# We're launched from run-shell, which owns no client, so resolve the client
# that triggered us. It both anchors the popup (-c, without which the popup
# gets no tty and fzf can't draw) and gives the terminal width for the cap.
client=$(tmux display -p '#{client_name}')
cols=$(tmux display -p -c "$client" '#{client_width}')

# Clamp between the original fixed width and 90% of the terminal. In between,
# pad for fzf's chrome: rounded border (2) + pointer gutter (2) + scrollbar (1)
# + a column of breathing room.
min=60
max=$(( cols * 90 / 100 ))
width=$(( longest + 6 ))
(( width < min )) && width=$min
(( width > max )) && width=$max

flags=(-c "$client" -w "$width" -h 10)
# Match the borderless popup the keybinding used on tmux >= 3.3.
if ~/.config/tmux/check-version.sh ">= 3.3"; then
  flags+=(-B)
fi

tmux display-popup "${flags[@]}" -E "'$0' --pick '$listfile'"