#!/usr/bin/env bash
# Build the tile-cache test fixture as a named Docker volume
# (`tile-cache-fixture`), or emit it to a local directory in
# ``--local <path>`` mode (used by the AZ-407 unit tests).
#
# AC-1 (deterministic): two invocations against the same input emit
# identical FAISS index hash, identical manifest rows, and identical
# tile filesystem byte sizes.
#
# Env vars:
#   TILE_CACHE_INPUT_DIR    Path to _docs/00_problem/input_data (required)
#   TILE_CACHE_VOLUME_NAME  Docker volume name (default: tile-cache-fixture)
#
# Usage:
#   build.sh                         # builds the named Docker volume
#   build.sh --local /tmp/out        # emits to /tmp/out (no Docker)

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "${SCRIPT_DIR}/../../.." && pwd)"

VOLUME_NAME="${TILE_CACHE_VOLUME_NAME:-tile-cache-fixture}"
INPUT_DIR="${TILE_CACHE_INPUT_DIR:-${REPO_ROOT}/_docs/00_problem/input_data}"

LOCAL_OUT=""
if [[ "${1:-}" == "--local" ]]; then
    if [[ -z "${2:-}" ]]; then
        echo "ERROR: --local requires an output directory" >&2
        exit 2
    fi
    LOCAL_OUT="$2"
fi

if [[ ! -d "${INPUT_DIR}" ]]; then
    echo "ERROR: input dir not found: ${INPUT_DIR}" >&2
    exit 2
fi

if [[ -n "${LOCAL_OUT}" ]]; then
    # Local mode: invoke builder.py directly. The caller's venv must
    # have Pillow, numpy, faiss-cpu installed; the unit test pulls
    # them via the dev extras.
    python3 "${SCRIPT_DIR}/builder.py" \
        --input-dir "${INPUT_DIR}" \
        --output-dir "${LOCAL_OUT}"
    exit 0
fi

# Docker mode: build the builder image and populate the named volume.
IMAGE_TAG="azaion-tile-cache-builder:local"

docker build -t "${IMAGE_TAG}" "${SCRIPT_DIR}"

# Recreate the named volume so output is bit-stable across runs (AC-1).
docker volume rm "${VOLUME_NAME}" >/dev/null 2>&1 || true
docker volume create "${VOLUME_NAME}" >/dev/null

docker run --rm \
    -v "${INPUT_DIR}:/input:ro" \
    -v "${VOLUME_NAME}:/output" \
    "${IMAGE_TAG}"

echo "tile-cache-fixture volume '${VOLUME_NAME}' built from ${INPUT_DIR}"