#!/usr/bin/env bash
# ──────────────────────────────────────────────────────────────────────────────
# Falah OS CE — One-line installer
# Usage:
#   curl -fsSL https://raw.githubusercontent.com/falahos/falah-os-ce/main/install.sh | bash
# ──────────────────────────────────────────────────────────────────────────────
set -euo pipefail

REPO_URL="https://github.com/falahos/falah-os-ce.git"
INSTALL_DIR="${FALAH_DIR:-$HOME/falah-os}"
CE_PORT="${CE_PORT:-3005}"

GREEN='\033[0;32m'
YELLOW='\033[1;33m'
RED='\033[0;31m'
NC='\033[0m'

log()  { echo -e "${GREEN}[falah]${NC} $*"; }
warn() { echo -e "${YELLOW}[warn]${NC}  $*"; }
die()  { echo -e "${RED}[error]${NC} $*" >&2; exit 1; }

# ── Prerequisites ─────────────────────────────────────────────────────────────

check_cmd() { command -v "$1" &>/dev/null || die "$1 is required but not installed. Please install it first."; }

log "Checking prerequisites…"
check_cmd docker
check_cmd git

# Docker Compose v2 (plugin) or v1 (standalone)
if docker compose version &>/dev/null 2>&1; then
  COMPOSE="docker compose"
elif command -v docker-compose &>/dev/null; then
  COMPOSE="docker-compose"
else
  die "Docker Compose not found. Install it from https://docs.docker.com/compose/install/"
fi

# Confirm Docker daemon is running
docker info &>/dev/null || die "Docker daemon is not running. Start Docker and retry."

# ── Clone or update ───────────────────────────────────────────────────────────

if [[ -d "$INSTALL_DIR/.git" ]]; then
  log "Updating existing installation at $INSTALL_DIR…"
  git -C "$INSTALL_DIR" pull --ff-only
else
  log "Installing Falah OS CE to $INSTALL_DIR…"
  git clone --depth 1 "$REPO_URL" "$INSTALL_DIR"
fi

cd "$INSTALL_DIR"

# ── Environment setup ─────────────────────────────────────────────────────────

if [[ ! -f .env ]]; then
  cp .env.example .env
  log "Created .env from template"

  echo ""
  warn "──────────────────────────────────────────────────"
  warn "  Configure your .env before starting Falah OS"
  warn "  credentials are in bitwarden.falahos.my"
  warn "──────────────────────────────────────────────────"
  echo ""

  # Interactive prompts — only if running in a terminal
  if [[ -t 0 ]]; then
    read -rp "  CASDOOR_CLIENT_ID (from auth.falahos.my): " casdoor_id
    if [[ -n "$casdoor_id" ]]; then
      sed -i.bak "s|^CASDOOR_CLIENT_ID=.*|CASDOOR_CLIENT_ID=$casdoor_id|" .env && rm -f .env.bak
    fi

    read -rp "  GITEA_TOKEN (from git.falahos.my, optional — press Enter to skip): " gitea_token
    if [[ -n "$gitea_token" ]]; then
      sed -i.bak "s|^GITEA_TOKEN=.*|GITEA_TOKEN=$gitea_token|" .env && rm -f .env.bak
    fi
  else
    warn "Non-interactive mode — edit $INSTALL_DIR/.env manually then run:"
    warn "  cd $INSTALL_DIR && $COMPOSE up -d"
    exit 0
  fi
fi

# ── Build & start ─────────────────────────────────────────────────────────────

log "Building containers (this takes a minute on first run)…"
$COMPOSE build --parallel

log "Starting Falah OS CE…"
$COMPOSE up -d

# ── Health check ──────────────────────────────────────────────────────────────

log "Waiting for services to be ready…"
for i in $(seq 1 20); do
  if curl -sf "http://localhost:${CE_PORT}/health" &>/dev/null; then
    break
  fi
  if [[ $i -eq 20 ]]; then
    warn "Falah OS CE did not respond in time. Check logs with:"
    warn "  cd $INSTALL_DIR && $COMPOSE logs -f"
    exit 1
  fi
  sleep 3
done

# ── Detect server IP for display ──────────────────────────────────────────────

SERVER_IP=$(hostname -I 2>/dev/null | awk '{print $1}' || echo "localhost")

echo ""
echo -e "${GREEN}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
echo -e "${GREEN}  ☽  Falah OS CE is running!${NC}"
echo ""
echo -e "  Browser →  http://${SERVER_IP}:${CE_PORT}"
echo ""
echo -e "  Manage  →  cd ${INSTALL_DIR}"
echo -e "             $COMPOSE logs -f     (live logs)"
echo -e "             $COMPOSE down        (stop)"
echo -e "             $COMPOSE pull && $COMPOSE up -d  (update)"
echo ""
echo -e "  Casdoor redirect URI to register:"
echo -e "  http://${SERVER_IP}:${CE_PORT}"
echo -e "${GREEN}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
echo ""