#!/usr/bin/env bash
# Multica fork CLI — installer (Linux / macOS / WSL).
#
# Installs the fork-built `multica` CLI (with agent-arka runtime support, Arka
# SSO, Russian i18n) from arka/public releases.
#
#   curl -fsSL https://git.arka-ai.ru/arka/public/raw/branch/main/multica/install.sh | bash
#
# Environment:
#   MULTICA_VERSION    pin a release (e.g. 0.6.1-arka). Default: newest multica-v* on git.arka-ai.ru/arka/public
#   MULTICA_BIN_DIR    install dir (default: /usr/local/bin, else ~/.local/bin)
#   NO_COLOR           1 to disable color output

if [ -z "${BASH_VERSION:-}" ]; then
  echo "The Multica installer needs bash. Run:" >&2
  echo "  curl -fsSL https://git.arka-ai.ru/arka/public/raw/branch/main/multica/install.sh | bash" >&2
  exit 1
fi

set -euo pipefail

PUBLIC_API="${MULTICA_PUBLIC_API:-https://git.arka-ai.ru/api/v1}"
PUBLIC_DL="${MULTICA_PUBLIC_DL:-https://git.arka-ai.ru/arka/public/releases/download}"
REPO="arka/public"
TAG_PREFIX="multica-v"

if [[ -t 1 && -z "${NO_COLOR:-}" ]]; then
  C_GREEN=$'\033[32m'; C_YELLOW=$'\033[33m'; C_RED=$'\033[31m'; C_BOLD=$'\033[1m'; C_RESET=$'\033[0m'
else
  C_GREEN=''; C_YELLOW=''; C_RED=''; C_BOLD=''; C_RESET=''
fi

info() { printf '%s\n' "$*"; }
ok()   { printf '%s✓%s %s\n' "$C_GREEN" "$C_RESET" "$*"; }
warn() { printf '%s⚠%s %s\n' "$C_YELLOW" "$C_RESET" "$*"; }
die()  { printf '%s✗%s %s\n' "$C_RED" "$C_RESET" "$*" >&2; exit 1; }

_mc_tmp=""
cleanup() { [[ -n "${_mc_tmp:-}" ]] && rm -rf "$_mc_tmp"; }
trap cleanup EXIT

detect_platform() {
  local os arch
  os=$(uname -s | tr '[:upper:]' '[:lower:]')
  arch=$(uname -m)
  case "$arch" in
    x86_64|amd64) arch="amd64" ;;
    aarch64|arm64) arch="arm64" ;;
    *) die "Unsupported architecture: $arch" ;;
  esac
  case "$os" in
    linux) PLATFORM="linux-${arch}" ;;
    darwin) PLATFORM="darwin-${arch}" ;;
    mingw*|msys*|cygwin*)
      die "This curl installer is for Linux/macOS/WSL. On Windows run the PowerShell installer instead:"$'\n'"  irm https://git.arka-ai.ru/arka/public/raw/branch/main/multica/install.ps1 | iex"
      ;;
    *) die "Unsupported OS: $os" ;;
  esac
}

fetch_latest_version() {
  local json tags
  json=$(curl -fsSL "${PUBLIC_API}/repos/${REPO}/releases?limit=50") || die "Cannot list releases at ${PUBLIC_API}/repos/${REPO}/releases"
  tags=$(printf '%s' "$json" | grep -oE '"tag_name":[[:space:]]*"'"${TAG_PREFIX}"'[^"]+"' | sed 's/.*"'"${TAG_PREFIX}"'//;s/"$//' || true)
  if [[ -z "$tags" ]]; then
    die "No ${TAG_PREFIX}* releases on ${REPO} yet"
  fi
  printf '%s\n' "$tags" | head -n 1
}

sha256_file() {
  if command -v sha256sum >/dev/null 2>&1; then
    sha256sum "$1" | awk '{print $1}'
  elif command -v shasum >/dev/null 2>&1; then
    shasum -a 256 "$1" | awk '{print $1}'
  else
    die "Need sha256sum or shasum"
  fi
}

ensure_path() {
  local bindir="$1"
  case ":$PATH:" in
    *":${bindir}:"*) return 0 ;;
  esac
  local line="export PATH=\"${bindir}:\$PATH\""
  local rc
  for rc in "${HOME}/.zprofile" "${HOME}/.zshrc" "${HOME}/.bash_profile" "${HOME}/.bashrc" "${HOME}/.profile"; do
    [[ -f "$rc" ]] || continue
    if grep -Fqs "$bindir" "$rc"; then
      return 0
    fi
  done
  if [[ -n "${SHELL:-}" && "${SHELL}" == *zsh* ]]; then
    rc="${HOME}/.zshrc"
  else
    rc="${HOME}/.bashrc"
    [[ -f "$rc" ]] || rc="${HOME}/.profile"
  fi
  printf '\n# Multica CLI\n%s\n' "$line" >>"$rc"
  warn "Added ${bindir} to PATH in ${rc} (open a new shell, or: source ${rc})"
}

main() {
  printf '%s\n' "${C_BOLD}Multica${C_RESET} — fork CLI installer (agent-arka support)"
  command -v curl >/dev/null 2>&1 || die "curl is required"
  command -v tar >/dev/null 2>&1 || die "tar is required"

  detect_platform

  local version
  if [[ -n "${MULTICA_VERSION:-}" ]]; then
    version="${MULTICA_VERSION#v}"
    version="${version#multica-v}"
    info "Using pinned version ${version}"
  else
    info "Resolving latest Multica release…"
    version=$(fetch_latest_version)
    info "Latest: ${version}"
  fi

  local asset="multica-cli-${version}-${PLATFORM}.tar.gz"
  local url="${PUBLIC_DL}/${TAG_PREFIX}${version}/${asset}"

  _mc_tmp=$(mktemp -d)
  info "Downloading ${url} ..."
  curl -fsSL "$url" -o "$_mc_tmp/multica.tar.gz" || die "Failed to download ${asset}"

  info "Verifying checksum …"
  local expected actual
  expected=$(curl -fsSL "${PUBLIC_DL}/${TAG_PREFIX}${version}/checksums.txt" | awk -v a="$asset" '$2==a {print $1; exit}' 2>/dev/null || true)
  actual=$(sha256_file "$_mc_tmp/multica.tar.gz")
  if [[ -n "$expected" ]]; then
    if [[ "$expected" != "$actual" ]]; then
      die "Checksum mismatch for ${asset}: expected ${expected}, got ${actual}"
    fi
    ok "Checksum verified"
  else
    warn "No checksum entry for ${asset}; skipping verification"
  fi

  tar -xzf "$_mc_tmp/multica.tar.gz" -C "$_mc_tmp" multica || die "Failed to extract multica"

  local bindir
  if [[ -n "${MULTICA_BIN_DIR:-}" ]]; then
    bindir="${MULTICA_BIN_DIR}"
  elif [[ -w /usr/local/bin ]]; then
    bindir="/usr/local/bin"
  elif command -v sudo >/dev/null 2>&1; then
    bindir="/usr/local/bin"
  else
    bindir="${HOME}/.local/bin"
  fi
  mkdir -p "$bindir"

  if [[ ! -w "$bindir" ]]; then
    sudo mv "$_mc_tmp/multica" "$bindir/multica" || die "Cannot write to ${bindir}"
  else
    mv "$_mc_tmp/multica" "$bindir/multica"
  fi
  chmod +x "$bindir/multica"
  ensure_path "$bindir"

  ok "Multica CLI ${version} installed to ${bindir}/multica"
  rm -rf "$_mc_tmp"; _mc_tmp=""

  printf '\n'
  printf '  Next — connect to your Multica server:\n'
  printf '    multica setup self-host\n'
  printf '  Or for this instance:\n'
  printf '    multica setup self-host --server-url https://plan.arka-ai.ru --app-url https://plan.arka-ai.ru\n'
  printf '\n'
}

main "$@"