#!/usr/bin/env bash
# PS1 module with Nerd Font fallback + disable switch
# Designed for bash 3.2+ (macOS) and bash 4/5 (Linux)
# Load this in interactive shells.

case "$-" in
  *i*) ;;
  *) return 0 ;;
esac

# Disable switch (per-user/per-shell)
# 1) env: DISABLE_GLOBAL_PS1=1
# 2) file: ~/.config/ps1/disable
if [[ "${DISABLE_GLOBAL_PS1:-0}" == "1" ]]; then
  return 0
fi
if [[ -f "$HOME/.config/ps1/disable" ]]; then
  return 0
fi

# Nerd Font detection (best-effort) + overrides
#   PS1_FORCE_ASCII=1 -> always fallback separators
#   PS1_FORCE_NF=1    -> always Nerd Font separators
_ps1_has_nf() {
  if [[ "${PS1_FORCE_ASCII:-0}" == "1" ]]; then return 1; fi
  if [[ "${PS1_FORCE_NF:-0}" == "1" ]]; then return 0; fi

  # Linux/WSL: fontconfig often available
  if command -v fc-list >/dev/null 2>&1; then
    fc-list 2>/dev/null | grep -qi "Nerd Font" && return 0
  fi

  # macOS: fontconfig often not present; default to fallback unless forced
  return 1
}

# Time-based emoji (Europe/Oslo)
_ps1_symbol() {
  local hh mm h m
  hh=$(TZ=Europe/Oslo date +%H); mm=$(TZ=Europe/Oslo date +%M)
  h=$((10#$hh)); m=$((10#$mm))

  if (( h >= 5 && h <= 8 )); then echo "🌅"
  elif (( h >= 9 && h <= 10 )); then echo "☕"
  elif (( h == 11 && m < 30 )); then echo "🥪"
  elif (( (h == 11 && m >= 30) || (h >= 12 && h <= 15) )); then echo "💻"
  elif (( h == 16 )); then echo "🍲"
  elif (( h >= 17 && h <= 22 )); then echo "🌆"
  else echo "🌙"
  fi
}

# Path shortening (keeps /home/user or /Users/user visible)
# bash 3.2 safe
_ps1_path() {
  local p="$PWD"
  local parts=()
  IFS='/' read -ra parts <<< "$p"

  if ((${#parts[@]} < 6)); then
    echo "$p"; return
  fi

  local n=${#parts[@]}
  echo "/${parts[1]}/${parts[2]}/…/${parts[$((n-2))]}/${parts[$((n-1))]}"
}

# Dynamic vars updated before each prompt
__PS1_SYM=""
__PS1_PATH=""
__PS1_STATUS=0
__PS1_USE_NF=0

_ps1_update() {
  __PS1_STATUS=$?
  __PS1_SYM="$(_ps1_symbol)"
  __PS1_PATH="$(_ps1_path)"
  if _ps1_has_nf; then __PS1_USE_NF=1; else __PS1_USE_NF=0; fi
}

ps1_on() {
  PROMPT_COMMAND="_ps1_update"

  local RST="\[\e[0m\]"

  # Two-zone palette
  # Zone 1: gray-blue pastel (date/time/user)
  local Z1_BG="\[\e[48;5;61m\]"
  local Z1_FG="\[\e[38;5;255m\]"

  # Zone 2: turquoise / cool green (host/path)
  local Z2_BG="\[\e[48;5;37m\]"
  local Z2_FG="\[\e[38;5;255m\]"
  local PATH_FG="\[\e[38;5;194m\]"

  # Frame
  local FRAME="\[\e[38;5;60m\]"

  # Status colors
  local OK="\[\e[38;5;76m\]"
  local BAD="\[\e[38;5;203m\]"

  # Separators with fallback
  local SEP_EXPR='\$( [ "$__PS1_USE_NF" -eq 1 ] && printf "" || printf "▶" )'
  local LEFT_EXPR='\$( [ "$__PS1_USE_NF" -eq 1 ] && printf "" || printf "[" )'
  local RIGHT_EXPR='\$( [ "$__PS1_USE_NF" -eq 1 ] && printf "" || printf "]" )'

  local PROMPT_SYM="\$( [ \$__PS1_STATUS -eq 0 ] && printf '${OK}' || printf '${BAD}' )➜${RST}"

  # Keep order: date time user | host path, newline, then prompt
  PS1="\
${FRAME}╭─${RST}\
${Z1_BG}${Z1_FG}${LEFT_EXPR} \d \A \u ${RST}${Z1_BG}${Z2_BG}${Z2_FG}${SEP_EXPR}${RST}\
${Z2_BG}${Z2_FG} @\h ${PATH_FG}\${__PS1_PATH} ${RST}${Z2_BG}${Z2_FG}${RIGHT_EXPR}${RST}\
\n${FRAME}╰── ${RST}${PROMPT_SYM} \${__PS1_SYM} "
}

ps1_off() { :; }

# Enable by default when loaded (global standard)
ps1_on