#!/usr/bin/env bash
# =====================================================================
# SMF2290 Pensum — Start.sh
# Universal launcher: setter opp alt som trengs og starter studie-appen.
# Fungerer på Linux, macOS, og WSL/Git-Bash på Windows.
# =====================================================================

set -e

# --- Resolve script directory (works with symlinks too) -----------
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
APP_DIR="$SCRIPT_DIR/app"
VENDOR_DIR="$APP_DIR/vendor"
DEFAULT_PORT=8765

# --- ANSI colours --------------------------------------------------
if [ -t 1 ] && command -v tput >/dev/null 2>&1; then
  BOLD="$(tput bold)"; DIM="$(tput dim)"; RESET="$(tput sgr0)"
  RED="$(tput setaf 1)"; GREEN="$(tput setaf 2)"; YELLOW="$(tput setaf 3)"
  BLUE="$(tput setaf 4)"; ORANGE="$(tput setaf 208 2>/dev/null || tput setaf 3)"
else
  BOLD=""; DIM=""; RESET=""; RED=""; GREEN=""; YELLOW=""; BLUE=""; ORANGE=""
fi

say()  { printf "%s\n" "$*"; }
info() { printf "  ${BLUE}▸${RESET} %s\n" "$*"; }
ok()   { printf "  ${GREEN}✓${RESET} %s\n" "$*"; }
warn() { printf "  ${YELLOW}!${RESET} %s\n" "$*"; }
err()  { printf "  ${RED}✗${RESET} %s\n" "$*"; }

# --- Banner --------------------------------------------------------
banner() {
  printf "\n"
  printf "  ${ORANGE}${BOLD}SMF · 2290${RESET}    ${DIM}Etikk, bærekraft og samfunnsansvar${RESET}\n"
  printf "  ${BOLD}${BOLD}Pensum${RESET}        ${DIM}studie-app · v1.0${RESET}\n"
  printf "\n"
}
banner

# --- Sanity check --------------------------------------------------
if [ ! -d "$APP_DIR" ]; then
  err "Fant ikke app-mappen: $APP_DIR"
  err "Kjør Start.sh fra SMF-prosjektmappen."
  exit 1
fi

# --- OS detection --------------------------------------------------
OS_NAME="$(uname -s 2>/dev/null || echo unknown)"
case "$OS_NAME" in
  Linux*)   PLATFORM="linux" ;;
  Darwin*)  PLATFORM="macos" ;;
  MINGW*|MSYS*|CYGWIN*) PLATFORM="windows" ;;
  *)        PLATFORM="unknown" ;;
esac
info "Plattform: ${BOLD}$PLATFORM${RESET}"

# --- Detect / install HTTP server ---------------------------------
SERVER_CMD=""
SERVER_NAME=""

find_server() {
  if command -v python3 >/dev/null 2>&1; then
    SERVER_CMD="python3 -m http.server PORT --bind 127.0.0.1"
    SERVER_NAME="Python 3 ($(python3 --version 2>&1 | awk '{print $2}'))"
    return 0
  fi
  if command -v python >/dev/null 2>&1 && python --version 2>&1 | grep -q "Python 3"; then
    SERVER_CMD="python -m http.server PORT --bind 127.0.0.1"
    SERVER_NAME="Python 3 ($(python --version 2>&1 | awk '{print $2}'))"
    return 0
  fi
  if command -v php >/dev/null 2>&1; then
    SERVER_CMD="php -S 127.0.0.1:PORT -t ."
    SERVER_NAME="PHP $(php --version 2>&1 | head -1 | awk '{print $2}')"
    return 0
  fi
  if command -v ruby >/dev/null 2>&1; then
    SERVER_CMD="ruby -run -e httpd . --port=PORT --bind-address=127.0.0.1"
    SERVER_NAME="Ruby $(ruby --version 2>&1 | awk '{print $2}')"
    return 0
  fi
  if command -v node >/dev/null 2>&1 && command -v npx >/dev/null 2>&1; then
    SERVER_CMD="npx --yes http-server -p PORT -a 127.0.0.1 --silent"
    SERVER_NAME="Node.js $(node --version 2>&1)"
    return 0
  fi
  return 1
}

try_install_python() {
  warn "Ingen webserver funnet. Forsøker å installere Python 3 …"
  local installed=0
  if command -v apt-get >/dev/null 2>&1; then
    info "Bruker apt (Debian/Ubuntu)"
    if sudo -n true 2>/dev/null || sudo -v; then
      sudo apt-get update -y && sudo apt-get install -y python3 && installed=1
    fi
  elif command -v dnf >/dev/null 2>&1; then
    info "Bruker dnf (Fedora/RHEL)"
    sudo dnf install -y python3 && installed=1
  elif command -v yum >/dev/null 2>&1; then
    info "Bruker yum"
    sudo yum install -y python3 && installed=1
  elif command -v pacman >/dev/null 2>&1; then
    info "Bruker pacman (Arch)"
    sudo pacman -Sy --noconfirm python && installed=1
  elif command -v zypper >/dev/null 2>&1; then
    info "Bruker zypper (openSUSE)"
    sudo zypper install -y python3 && installed=1
  elif command -v apk >/dev/null 2>&1; then
    info "Bruker apk (Alpine)"
    sudo apk add python3 && installed=1
  elif command -v brew >/dev/null 2>&1; then
    info "Bruker Homebrew (macOS)"
    brew install python3 && installed=1
  elif [ "$PLATFORM" = "macos" ]; then
    warn "Homebrew finnes ikke. Installerer Homebrew først …"
    /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" \
      && brew install python3 && installed=1
  fi
  [ $installed -eq 1 ]
}

info "Søker etter HTTP-server …"
if find_server; then
  ok "Server-runtime: ${BOLD}$SERVER_NAME${RESET}"
else
  if try_install_python && find_server; then
    ok "Server-runtime: ${BOLD}$SERVER_NAME${RESET} (nylig installert)"
  else
    err "Klarte ikke installere en webserver automatisk."
    say ""
    say "  Installer ${BOLD}én av disse${RESET} manuelt og prøv igjen:"
    say "    • Python 3:  https://www.python.org/downloads/"
    say "    • Node.js:   https://nodejs.org/"
    say "    • PHP eller Ruby via pakkesystemet ditt"
    say ""
    exit 1
  fi
fi

# --- Verify marked.js (markdown renderer) -------------------------
if [ ! -s "$VENDOR_DIR/marked.min.js" ]; then
  warn "marked.min.js mangler — laster ned …"
  mkdir -p "$VENDOR_DIR"
  if command -v curl >/dev/null 2>&1; then
    curl -fsSL https://cdn.jsdelivr.net/npm/marked/marked.min.js -o "$VENDOR_DIR/marked.min.js" \
      && ok "marked.js lastet ned" \
      || { err "Klarte ikke laste ned marked.js. Trenger internett ved første kjøring."; exit 1; }
  elif command -v wget >/dev/null 2>&1; then
    wget -q https://cdn.jsdelivr.net/npm/marked/marked.min.js -O "$VENDOR_DIR/marked.min.js" \
      && ok "marked.js lastet ned" \
      || { err "Klarte ikke laste ned marked.js."; exit 1; }
  else
    err "Hverken curl eller wget funnet. Installer en av dem og kjør Start.sh igjen."
    exit 1
  fi
else
  ok "marked.js OK ($(wc -c < "$VENDOR_DIR/marked.min.js") bytes)"
fi

# --- Sanity-sjekk dataene ----------------------------------------
required_files=(
  "index.html"
  "css/style.css"
  "js/app.js"
  "data/flashcards.json"
  "data/quiz.json"
  "data/exam.json"
  "notes/uke17-eksamen.md"
)
missing=0
for f in "${required_files[@]}"; do
  if [ ! -e "$APP_DIR/$f" ] && [ ! -L "$APP_DIR/$f" ]; then
    err "Mangler: app/$f"
    missing=$((missing + 1))
  fi
done

# app/notes opprettes per plattform (gitignorert). Den skal være en symlink
# til ../notes. Håndter ødelagt symlink ELLER en git-materialisert tekstfil.
if [ -L "$APP_DIR/notes" ] && [ ! -e "$APP_DIR/notes" ]; then
  warn "notes-symlink er ødelagt — gjenoppretter …"
  rm -f "$APP_DIR/notes"
elif [ -f "$APP_DIR/notes" ]; then
  warn "app/notes er en vanlig fil (git-symlink fra Windows) — erstatter med symlink …"
  rm -f "$APP_DIR/notes"
fi
if [ ! -d "$APP_DIR/notes" ]; then
  if [ -d "$SCRIPT_DIR/notes" ]; then
    ln -sfn "../notes" "$APP_DIR/notes"
    ok "Symlink notes/ gjenopprettet"
  else
    err "Fant ikke notes/-mappen i prosjektet"
    missing=$((missing + 1))
  fi
fi
[ $missing -eq 0 ] && ok "Alle nødvendige filer på plass"

# --- Pick a free port --------------------------------------------
port_free() {
  local p="$1"
  if command -v lsof >/dev/null 2>&1; then
    ! lsof -i :"$p" -sTCP:LISTEN >/dev/null 2>&1
  elif command -v ss >/dev/null 2>&1; then
    ! ss -ltn 2>/dev/null | awk '{print $4}' | grep -q ":$p$"
  elif command -v netstat >/dev/null 2>&1; then
    ! netstat -ltn 2>/dev/null | awk '{print $4}' | grep -q ":$p$"
  else
    # No tool — assume free, the server will error out if not
    return 0
  fi
}

PORT="$DEFAULT_PORT"
while ! port_free "$PORT"; do
  warn "Port $PORT er opptatt — prøver $((PORT + 1))"
  PORT=$((PORT + 1))
  if [ "$PORT" -gt 8800 ]; then
    err "Fant ingen ledig port i 8765–8800. Lukk noen prosesser og prøv igjen."
    exit 1
  fi
done

URL="http://localhost:$PORT"
SERVER_CMD="${SERVER_CMD//PORT/$PORT}"

# --- Auto-open browser -------------------------------------------
open_browser() {
  ( sleep 1.5
    if command -v xdg-open >/dev/null 2>&1; then
      xdg-open "$URL" >/dev/null 2>&1 &
    elif command -v open >/dev/null 2>&1; then
      open "$URL" >/dev/null 2>&1 &
    elif command -v start >/dev/null 2>&1; then
      start "$URL" >/dev/null 2>&1 &
    fi
  ) &
}

# --- Banner og start ----------------------------------------------
printf "\n"
printf "  ${BOLD}┌──────────────────────────────────────────────┐${RESET}\n"
printf "  ${BOLD}│${RESET}  ${ORANGE}${BOLD}SMF2290${RESET} · Pensum                            ${BOLD}│${RESET}\n"
printf "  ${BOLD}│${RESET}                                              ${BOLD}│${RESET}\n"
printf "  ${BOLD}│${RESET}  ${GREEN}→ %-42s${RESET}${BOLD}│${RESET}\n" "$URL"
printf "  ${BOLD}│${RESET}                                              ${BOLD}│${RESET}\n"
SHORT_NAME="${SERVER_NAME:0:36}"
printf "  ${BOLD}│${RESET}  ${DIM}Server: %-38s${RESET}${BOLD}│${RESET}\n" "$SHORT_NAME"
printf "  ${BOLD}│${RESET}  ${DIM}Trykk Ctrl+C for å stoppe${RESET}                   ${BOLD}│${RESET}\n"
printf "  ${BOLD}└──────────────────────────────────────────────┘${RESET}\n\n"

open_browser

cd "$APP_DIR"
# shellcheck disable=SC2086
exec $SERVER_CMD