#!/usr/bin/env bash
# Clone the tile-cache fixture and emit `synth-age-7mo` + `synth-age-13mo`
# Docker volumes (or local directories in ``--local`` mode).
#
# AC-3: dates shifted by 7 mo / 13 mo ±1 day; tile pixel content
# bit-identical to the source.
#
# Env vars:
#   TILE_CACHE_VOLUME_NAME  Source volume (default: tile-cache-fixture)
#   AGE_7MO_VOLUME_NAME     Output volume for 7mo (default: synth-age-7mo)
#   AGE_13MO_VOLUME_NAME    Output volume for 13mo (default: synth-age-13mo)
#
# Usage:
#   inject.sh                                  # Docker mode
#   inject.sh --local /src /out-7mo /out-13mo  # local mode (unit test path)

set -euo pipefail

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

SOURCE_VOL="${TILE_CACHE_VOLUME_NAME:-tile-cache-fixture}"
OUT_7MO_VOL="${AGE_7MO_VOLUME_NAME:-synth-age-7mo}"
OUT_13MO_VOL="${AGE_13MO_VOLUME_NAME:-synth-age-13mo}"

if [[ "${1:-}" == "--local" ]]; then
    if [[ -z "${2:-}" || -z "${3:-}" || -z "${4:-}" ]]; then
        echo "ERROR: --local requires <src_dir> <out_7mo_dir> <out_13mo_dir>" >&2
        exit 2
    fi
    python3 "${SCRIPT_DIR}/age_injector.py" \
        --source-dir "$2" --output-dir "$3" --age-months 7
    python3 "${SCRIPT_DIR}/age_injector.py" \
        --source-dir "$2" --output-dir "$4" --age-months 13
    exit 0
fi

# Docker mode: reuse the tile-cache-builder image (it already has
# Python + Pillow + numpy; the injector script is mounted in).
IMAGE_TAG="azaion-tile-cache-builder:local"

for spec in "${OUT_7MO_VOL}:7" "${OUT_13MO_VOL}:13"; do
    target_vol="${spec%%:*}"
    months="${spec##*:}"

    docker volume rm "${target_vol}" >/dev/null 2>&1 || true
    docker volume create "${target_vol}" >/dev/null

    docker run --rm \
        -v "${SCRIPT_DIR}:/opt/injector:ro" \
        -v "${SOURCE_VOL}:/source:ro" \
        -v "${target_vol}:/output" \
        --entrypoint python3 \
        "${IMAGE_TAG}" \
        /opt/injector/age_injector.py \
        --source-dir /source \
        --output-dir /output \
        --age-months "${months}"

    echo "synth-age volume '${target_vol}' built (age=${months}mo)"
done