# shellcheck shell=bash
# Shared helpers: messages, project discovery, configuration, state paths.

ocsb_die() {
  echo "opencode-sandbox: $*" >&2
  exit 1
}
ocsb_warn() { echo "⚠ $*" >&2; }
ocsb_info() { echo "→ $*"; }

# --- configuration ------------------------------------------------------------------------
# Layers, later wins:
#   1. defaults below
#   2. ~/.config/opencode-sandbox/sandbox.conf          (user, all projects)
#   3. <project>/.opencode-sandbox/sandbox.conf         (committed)
#   4. <project>/.opencode-sandbox/local/sandbox.conf   (git-ignored, personal)
#   5. OCSB_<SETTING> from the environment              (scalars only, one run)
# Config files are bash: scalars and arrays. OCSB_PROJECT_DIR is already set when they load.

OCSB_SCALARS=(
  OCSB_NAME OCSB_WEB_PORT OCSB_EGRESS_PORT OCSB_NETLOCK_GROUP OCSB_SANDBOX OCSB_PANEL
  OCSB_NOTIFICATIONS OCSB_OPENCODE_BIN OCSB_ENV_FILE OCSB_KUBECONFIG OCSB_PASSWORD_FILE
  OCSB_WORKTREES_DIR OCSB_WT_PREFIX OCSB_WT_BASE OCSB_WT_SLUG_REGEX OCSB_DOCKER_GW
  OCSB_STATE_DIR OCSB_OPENCODE_CONFIG OCSB_EGRESS_BASE
)
OCSB_ARRAYS=(OCSB_RW OCSB_RW_HOME OCSB_HIDE OCSB_HIDE_HOME OCSB_SKILLS OCSB_SKILL_DIRS OCSB_PLUGINS OCSB_ENV)

ocsb_defaults() {
  OCSB_NAME=""                 # default: basename of the project directory
  OCSB_WEB_PORT=4196           # browser port (context panel); OpenCode itself listens on +1
  OCSB_EGRESS_PORT=3128        # squid port on 127.0.0.1 and the docker0 gateway
  OCSB_NETLOCK_GROUP=opencode-sandbox
  OCSB_SANDBOX=1               # bubblewrap; 0 = egress filter and netlock only
  OCSB_PANEL=1                 # "Tokens" panel in the web UI (plugins/context-panel)
  OCSB_NOTIFICATIONS=1         # desktop notifications through a filtered D-Bus proxy
  OCSB_OPENCODE_BIN=""         # default: `opencode` from PATH
  OCSB_ENV_FILE=""             # KEY=VALUE file with tokens, exported to OpenCode
  OCSB_KUBECONFIG=""           # kubeconfig for the agent (~/.kube/config stays hidden)
  OCSB_PASSWORD_FILE=""        # web UI password; default: generated in the state dir
  OCSB_WORKTREES_DIR=""        # default: <parent of project>/<project>-worktrees
  OCSB_WT_PREFIX=""            # worktree directory = <prefix><slug>
  OCSB_WT_BASE=""              # branch new worktrees start from; default: current HEAD
  OCSB_WT_SLUG_REGEX=""        # ERE with one group: slug from the branch name
  OCSB_DOCKER_GW=""            # default: address of docker0
  OCSB_STATE_DIR=""            # default: ~/.local/share/opencode-sandbox/<name>
  OCSB_OPENCODE_CONFIG=""      # global OpenCode config; default: user's or the package's
  OCSB_RW=()                   # extra paths the agent may write (relative to the project)
  # Home directories that stay writable for toolchains and caches (only if they exist)
  OCSB_RW_HOME=(.cache .npm .bun .bundle .gem .asdf .local/share/mise .cargo .rustup go
    .m2 .gradle .docker/buildx .kube/cache)
  OCSB_HIDE=()                 # extra paths hidden from the agent (relative to the project)
  # Hidden home paths: credentials of other tools, browsers, other agents
  OCSB_HIDE_HOME=(.gnupg .aws .azure .config/gcloud .kube/config .docker/config.json .netrc
    .git-credentials .config/gh/hosts.yml .password-store .local/share/keyrings .mozilla
    .config/google-chrome .config/chromium .config/BraveSoftware .claude .codex
    .config/opencode .local/share/opencode)
  OCSB_SKILLS=(opencode-sandbox)  # skills mounted for the agent (names of skill directories)
  OCSB_SKILL_DIRS=()           # extra directories to look for skills in
  OCSB_PLUGINS=(skill-compact-resurrect/skill-compact-resurrect.v2.ts)  # files in plugins/
  OCSB_ENV=()                  # extra KEY=VALUE for OpenCode
}

ocsb_find_project() {
  local dir=${1:-$PWD}
  while [[ ${dir} != / ]]; do
    [[ -f ${dir}/.opencode-sandbox/sandbox.conf ]] && { echo "${dir}"; return 0; }
    dir=$(dirname "${dir}")
  done
  return 1
}

# ocsb_load_project [--optional]: find the project, load config layers, derive paths
ocsb_load_project() {
  local optional=0 saved=() v f
  [[ ${1:-} == --optional ]] && optional=1
  for v in "${OCSB_SCALARS[@]}"; do
    [[ -n ${!v+x} ]] && saved+=("${v}=${!v}")
  done
  ocsb_defaults

  OCSB_PROJECT_DIR=""
  if [[ -n ${OCSB_PROJECT:-} ]]; then
    OCSB_PROJECT_DIR=$(cd "${OCSB_PROJECT}" && pwd)
  else
    OCSB_PROJECT_DIR=$(ocsb_find_project) || true
  fi
  if [[ -z ${OCSB_PROJECT_DIR} || ! -f ${OCSB_PROJECT_DIR}/.opencode-sandbox/sandbox.conf ]]; then
    [[ ${optional} == 1 ]] || ocsb_die "no .opencode-sandbox/sandbox.conf here or above (run: opencode-sandbox init)"
  fi
  export OCSB_PROJECT_DIR

  for f in "${XDG_CONFIG_HOME:-${HOME}/.config}/opencode-sandbox/sandbox.conf" \
    ${OCSB_PROJECT_DIR:+"${OCSB_PROJECT_DIR}/.opencode-sandbox/sandbox.conf"} \
    ${OCSB_PROJECT_DIR:+"${OCSB_PROJECT_DIR}/.opencode-sandbox/local/sandbox.conf"}; do
    # shellcheck disable=SC1090
    [[ -f ${f} ]] && source "${f}"
  done
  for v in "${saved[@]}"; do
    printf -v "${v%%=*}" '%s' "${v#*=}"
  done
  ocsb_derive
}

ocsb_derive() {
  local base
  base=$(basename "${OCSB_PROJECT_DIR:-default}")
  OCSB_NAME=${OCSB_NAME:-${base}}
  OCSB_NAME=$(printf '%s' "${OCSB_NAME}" | tr -c 'a-zA-Z0-9_.-' '-' | tr '[:upper:]' '[:lower:]')
  OCSB_STATE_DIR=${OCSB_STATE_DIR:-${XDG_DATA_HOME:-${HOME}/.local/share}/opencode-sandbox/${OCSB_NAME}}
  if [[ -n ${OCSB_PROJECT_DIR} ]]; then
    OCSB_WORKTREES_DIR=${OCSB_WORKTREES_DIR:-$(dirname "${OCSB_PROJECT_DIR}")/${base}-worktrees}
    OCSB_WORKTREES_DIR=$(ocsb_abs "${OCSB_WORKTREES_DIR}")
  fi
  if [[ -z ${OCSB_DOCKER_GW} ]]; then
    OCSB_DOCKER_GW=$(ip -4 -o addr show docker0 2>/dev/null | awk '{print $4}' | cut -d/ -f1 | head -1)
    OCSB_DOCKER_GW=${OCSB_DOCKER_GW:-172.17.0.1}
  fi
  OCSB_CONTAINER="opencode-sandbox-egress-${OCSB_NAME}"
  OCSB_IMAGE="opencode-sandbox-egress"
}

# Path relative to the project (or ~/..., or absolute) → absolute path
ocsb_abs() {
  local p=$1
  # shellcheck disable=SC2088 # a literal "~" comes from config files
  case "${p}" in
    /*) ;;
    "~") p=${HOME} ;;
    "~/"*) p=${HOME}/${p#"~/"} ;;
    *) p=${OCSB_PROJECT_DIR}/${p} ;;
  esac
  realpath -m "${p}"
}

ocsb_print_config() {
  local v
  echo "# project: ${OCSB_PROJECT_DIR:-none}"
  for v in "${OCSB_SCALARS[@]}"; do
    printf '%s=%q\n' "${v}" "${!v}"
  done
  for v in "${OCSB_ARRAYS[@]}"; do
    local -n arr=${v}
    printf '%s=(' "${v}"
    [[ ${#arr[@]} -gt 0 ]] && printf ' %q' "${arr[@]}"
    printf ' )\n'
    unset -n arr
  done
}

# OpenCode binary: OCSB_OPENCODE_BIN (a path, relative to the project, or a command) or PATH
ocsb_opencode_bin() {
  local b=${OCSB_OPENCODE_BIN:-opencode}
  if [[ ${b} == */* || ${b} == "~"* ]]; then
    ocsb_abs "${b}"
  else
    command -v "${b}" || true
  fi
}