#!/usr/bin/env bash
# Read-only import of one Home Assistant instance's /config tree (plus a
# curated .storage/* export and an /api/states fixture snapshot) into this
# repo, normalized and split per kb/decisions/ha-configs-as-code.md.
#
# This script NEVER writes to the HA instance. It is idempotent: re-running
# against an unchanged instance produces no diff under
# services/home-assistant/config/<instance>/ or storage-export/<instance>/.
#
# Two adapters are implemented — see DESIGN.md, "Deploy path: adapter per
# instance":
#   - "docker-exec": pulls the whole /config tree over `ssh ... docker exec
#     ... tar`. Used where the HA instance's filesystem is reachable.
#   - "api": for instances with no filesystem/SSH access (HAOS, e.g. "ken").
#     Pulls automations/scripts/scenes via REST and dashboards/registries/
#     helpers via the WebSocket API (scripts/ha/lib/import_api.py). Full
#     /config import is out of scope for this adapter.
#
# The /api/states fixture fetch works for either adapter, since it only
# needs a reachable base_url + token, not full config access.
#
# Usage: scripts/ha/import.sh <instance>
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SERVICE_DIR="$(cd "$SCRIPT_DIR/../../services/home-assistant" && pwd)"
INSTANCES_FILE="$SERVICE_DIR/instances.yaml"
GITIGNORE_FILE="$SERVICE_DIR/.gitignore"

# shellcheck source=lib/apply_gitignore.sh
source "$SCRIPT_DIR/lib/apply_gitignore.sh"

is_storage_export_candidate() {
  local base="$1"
  case "$base" in
    core.area_registry|core.entity_registry) return 0 ;;
    input_*|lovelace*) return 0 ;;
    *) return 1 ;;
  esac
}

fetch_fixtures() {
  local token_file="${HA_TOKEN_PATH/#\~/$HOME}"
  if [[ -z "$HA_TOKEN_PATH" || ! -f "$token_file" ]]; then
    echo "-> fixtures: no token at '${token_file:-<unset>}' — skipping fixtures fetch (not a failure)" >&2
    return 0
  fi

  mkdir -p "$FIXTURES_DIR"
  local dest="$FIXTURES_DIR/${INSTANCE}-states-$(date +%F).yaml"
  local raw_file
  raw_file="$(mktemp)"

  local fetch_ok=1
  if [[ "$HA_ADAPTER" == "docker-exec" ]]; then
    # docker-exec adapter: token is read into a shell variable and embedded
    # in the remote curl command over ssh (pre-existing behavior, left
    # untouched — see DESIGN.md, "Deploy path: adapter per instance").
    local token
    token="$(<"$token_file")"
    ssh "${HA_SSH_USER}@${HA_SSH_HOST}" \
      "curl -sf -H 'Authorization: Bearer ${token}' http://localhost:8123/api/states" \
      > "$raw_file" || fetch_ok=0
  else
    # api adapter: the token never touches a shell variable or a subprocess
    # argv here — ha_api.py reads token_file itself and sets the
    # Authorization header in-process via `requests`.
    python3 "$SCRIPT_DIR/lib/ha_api.py" get-raw "$HA_BASE_URL" "$token_file" /api/states \
      > "$raw_file" || fetch_ok=0
  fi

  if [[ "$fetch_ok" -ne 1 ]]; then
    echo "-> fixtures: fetch failed for instance '$INSTANCE' — skipping (not failing the import)" >&2
    rm -f "$raw_file"
    return 0
  fi

  python3 "$SCRIPT_DIR/lib/normalize.py" json "$raw_file" > "$dest"
  rm -f "$raw_file"
  echo "-> fixtures: wrote $dest" >&2
}

list_known_instances() {
  python3 - "$INSTANCES_FILE" <<'PYEOF'
import sys
import yaml
data = yaml.safe_load(open(sys.argv[1], encoding="utf-8"))
print(" ".join(sorted((data or {}).get("instances", {}))))
PYEOF
}

usage() {
  echo "usage: $0 <instance>" >&2
  echo "known instances: $(list_known_instances)" >&2
}

if [[ $# -ne 1 ]]; then
  usage
  exit 2
fi

INSTANCE="$1"

if [[ ! -f "$INSTANCES_FILE" ]]; then
  echo "error: instances file not found: $INSTANCES_FILE" >&2
  exit 1
fi

INSTANCE_CONFIG_OUTPUT="$(python3 "$SCRIPT_DIR/lib/instance_config.py" "$INSTANCES_FILE" "$INSTANCE")" || exit 1
eval "$INSTANCE_CONFIG_OUTPUT"

CONFIG_OUT_DIR="$SERVICE_DIR/config/$INSTANCE"
STORAGE_OUT_DIR="$SERVICE_DIR/storage-export/$INSTANCE"
FIXTURES_DIR="$SERVICE_DIR/fixtures"

echo "== ha import: instance=$INSTANCE adapter=$HA_ADAPTER host=$HA_HOST ==" >&2

if [[ "$HA_ADAPTER" == "docker-exec" ]]; then

if [[ -z "$HA_SSH_USER" || -z "$HA_SSH_HOST" ]]; then
  echo "error: instance '$INSTANCE' is missing ssh.user/ssh.host in instances.yaml" >&2
  exit 1
fi

if [[ -z "$HA_CONTAINER" ]]; then
  echo "error: instance '$INSTANCE' is missing 'container' in instances.yaml" >&2
  exit 1
fi

TMPDIR="$(mktemp -d "${TMPDIR:-/tmp}/ha-import-${INSTANCE}.XXXXXX")"
trap 'rm -rf "$TMPDIR"' EXIT

EXTRACT_DIR="$TMPDIR/config"
mkdir -p "$EXTRACT_DIR"

echo "-> pulling /config from ${HA_CONTAINER} on ${HA_SSH_HOST} via docker exec ..." >&2
if ! ssh "${HA_SSH_USER}@${HA_SSH_HOST}" "docker exec ${HA_CONTAINER} tar cf - -C /config ." > "$TMPDIR/config.tar"; then
  echo "error: ssh/docker exec pull failed for instance '$INSTANCE' (host=${HA_SSH_HOST} container=${HA_CONTAINER})" >&2
  exit 1
fi

tar xf "$TMPDIR/config.tar" -C "$EXTRACT_DIR"

echo "-> filtering excluded paths (per $GITIGNORE_FILE) ..." >&2
apply_gitignore_filter "$EXTRACT_DIR" "$GITIGNORE_FILE"

echo "-> normalizing + splitting config into $CONFIG_OUT_DIR ..." >&2
mkdir -p "$CONFIG_OUT_DIR"

while IFS= read -r -d '' src; do
  rel="${src#"$EXTRACT_DIR"/}"
  base="$(basename "$src")"

  case "$base" in
    automations.yaml|scripts.yaml|scenes.yaml)
      python3 "$SCRIPT_DIR/lib/split.py" "$src" "$CONFIG_OUT_DIR" > /dev/null
      ;;
    *)
      dest="$CONFIG_OUT_DIR/$rel"
      mkdir -p "$(dirname "$dest")"
      python3 "$SCRIPT_DIR/lib/normalize.py" yaml "$src" > "$dest"
      ;;
  esac
done < <(find "$EXTRACT_DIR" -type f -name '*.yaml' -not -path '*/.storage/*' -print0)

echo "-> exporting curated .storage/* into $STORAGE_OUT_DIR ..." >&2
mkdir -p "$STORAGE_OUT_DIR"
if [[ -d "$EXTRACT_DIR/.storage" ]]; then
  while IFS= read -r -d '' src; do
    base="$(basename "$src")"
    if is_storage_export_candidate "$base"; then
      dest="$STORAGE_OUT_DIR/${base}.yaml"
      python3 "$SCRIPT_DIR/lib/normalize.py" json "$src" > "$dest"
    fi
  done < <(find "$EXTRACT_DIR/.storage" -maxdepth 1 -type f -print0)
else
  echo "   (no .storage directory in pulled config — skipping)" >&2
fi

elif [[ "$HA_ADAPTER" == "api" ]]; then

  api_token_file="${HA_TOKEN_PATH/#\~/$HOME}"
  if [[ -z "$HA_TOKEN_PATH" || ! -f "$api_token_file" ]]; then
    echo "error: instance '$INSTANCE' has adapter=api but no token at '${api_token_file:-<unset>}'." >&2
    echo "       the api adapter has no filesystem fallback (HAOS has no SSH) — without a" >&2
    echo "       deploy_agent long-lived access token there is nothing to import at all." >&2
    echo "       See DESIGN.md, 'Tokens', for how to provision one." >&2
    exit 1
  fi

  mkdir -p "$CONFIG_OUT_DIR" "$STORAGE_OUT_DIR"
  echo "-> importing automations/scripts/scenes (REST) + dashboards/registries/helpers (websocket) ..." >&2
  python3 "$SCRIPT_DIR/lib/import_api.py" "$HA_BASE_URL" "$api_token_file" "$CONFIG_OUT_DIR" "$STORAGE_OUT_DIR"

else
  echo "error: adapter '$HA_ADAPTER' has no config-extraction implementation." >&2
  echo "       see DESIGN.md, 'Deploy path: adapter per instance' — only docker-exec and api are built." >&2
  echo "       config/${INSTANCE}/ and storage-export/${INSTANCE}/ were NOT touched." >&2
  fetch_fixtures || true
  exit 1
fi

fetch_fixtures

echo "-> summary of changes:" >&2
REPO_ROOT="$(git -C "$SERVICE_DIR" rev-parse --show-toplevel 2>/dev/null || true)"
if [[ -n "$REPO_ROOT" ]]; then
  git -C "$REPO_ROOT" status --porcelain -- \
    "services/home-assistant/config/$INSTANCE" \
    "services/home-assistant/storage-export/$INSTANCE" || true
else
  echo "   (not inside a git worktree — skipping git diff summary)" >&2
fi

echo "== import complete: $INSTANCE ==" >&2