#!/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

# Force NF separators globally (rounded caps) unless ASCII is forced.
export PS1_FORCE_NF=1

# 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
}

# Season selection (dynamic or static)
#   PS1_SEASON_MODE=dynamic|static
#   PS1_SEASON= winter|spring|summer|autumn
# Also reads config from /etc/ps1-season or ~/.config/ps1/season
_ps1_season_config() {
  local cfg=""
  if [[ -r /etc/ps1-season ]]; then
    cfg="/etc/ps1-season"
  elif [[ -r "$HOME/.config/ps1/season" ]]; then
    cfg="$HOME/.config/ps1/season"
  fi

  if [[ -n "$cfg" ]]; then
    while IFS='=' read -r k v; do
      k="${k//[[:space:]]/}"
      v="${v//[[:space:]]/}"
      case "$k" in
        PS1_SEASON_MODE) export PS1_SEASON_MODE="$v" ;;
        PS1_SEASON) export PS1_SEASON="$v" ;;
      esac
    done < "$cfg"
  fi
}

_ps1_season_dynamic() {
  local mm dd m d
  mm=$(TZ=Europe/Oslo date +%m); dd=$(TZ=Europe/Oslo date +%d)
  m=$((10#$mm)); d=$((10#$dd))

  if (( m >= 3 && m <= 5 )); then
    echo "spring"
  elif (( m >= 6 && m <= 8 )); then
    echo "summer"
  elif (( m == 9 || m == 10 || (m == 11 && d < 15) )); then
    echo "autumn"
  else
    echo "winter"
  fi
}

_ps1_season() {
  _ps1_season_config
  local mode="${PS1_SEASON_MODE:-dynamic}"
  local season="${PS1_SEASON:-}"

  if [[ "$mode" == "static" && -n "$season" ]]; then
    echo "$season"
  else
    _ps1_season_dynamic
  fi
}

# 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_SEASON="winter"

_ps1_set_prompt() {
  local RST="\[\e[0m\]"

  # Seasonal palettes (Z1 is darker than Z2)
  local Z1_BG Z1_FG Z2_BG Z2_FG PATH_FG FRAME
  case "$__PS1_SEASON" in
    spring)
      Z1_BG="\[\e[48;5;71m\]"
      Z1_FG="\[\e[38;5;255m\]"
      Z2_BG="\[\e[48;5;120m\]"
      Z2_FG="\[\e[38;5;16m\]"
      PATH_FG="\[\e[38;5;16m\]"
      FRAME="\[\e[38;5;65m\]"
      ;;
    summer)
      Z1_BG="\[\e[48;5;142m\]"
      Z1_FG="\[\e[38;5;255m\]"
      Z2_BG="\[\e[48;5;214m\]"
      Z2_FG="\[\e[38;5;0m\]"
      PATH_FG="\[\e[38;5;16m\]"
      FRAME="\[\e[38;5;130m\]"
      ;;
    autumn)
      Z1_BG="\[\e[48;5;95m\]"
      Z1_FG="\[\e[38;5;255m\]"
      Z2_BG="\[\e[48;5;173m\]"
      Z2_FG="\[\e[38;5;255m\]"
      PATH_FG="\[\e[38;5;223m\]"
      FRAME="\[\e[38;5;95m\]"
      ;;
    *)
      # winter (default)
      Z1_BG="\[\e[48;5;61m\]"
      Z1_FG="\[\e[38;5;255m\]"
      Z2_BG="\[\e[48;5;37m\]"
      Z2_FG="\[\e[38;5;255m\]"
      PATH_FG="\[\e[38;5;194m\]"
      FRAME="\[\e[38;5;60m\]"
      ;;
  esac

  # Status colors
  local OK="\[\e[38;5;76m\]"
  local BAD="\[\e[38;5;203m\]"
  local BOLD="\[\e[1m\]"
  local NOBOLD="\[\e[22m\]"

  local left right sep
  if [[ "$__PS1_USE_NF" -eq 1 ]]; then
    left=""; right=""; sep=""
  else
    left="["; right="]"; sep="▶"
  fi

  local prompt_sym
  if [[ "$__PS1_STATUS" -eq 0 ]]; then
    prompt_sym="${OK}${BOLD}➜${NOBOLD}${RST}"
  else
    prompt_sym="${BAD}${BOLD}➜${NOBOLD}${RST}"
  fi

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

_ps1_update() {
  __PS1_STATUS=$?
  __PS1_SYM="$(_ps1_symbol)"
  __PS1_PATH="$(_ps1_path)"
  __PS1_SEASON="$(_ps1_season)"
  if _ps1_has_nf; then __PS1_USE_NF=1; else __PS1_USE_NF=0; fi
  _ps1_set_prompt
}

ps1_on() {
  if [[ "${PROMPT_COMMAND:-}" != *"_ps1_update"* ]]; then
    if [[ -n "${PROMPT_COMMAND:-}" ]]; then
      PROMPT_COMMAND="${PROMPT_COMMAND}; _ps1_update"
    else
      PROMPT_COMMAND="_ps1_update"
    fi
  fi

  _ps1_set_prompt
}

ps1_off() { :; }

# Enable by default when loaded (global standard)
ps1_on