#!/usr/bin/env bash
# Build the two Kvitt images for linux/arm64 on the Mac and push them to the Gitea registry (SPEC §10.3).
# The Mac fallback for the Gitea Actions workflow .gitea/workflows/build-images.yaml (which is the normal path).
# Usage: infra/build-images.sh [tag]      tag defaults to the short git SHA of HEAD; `latest` is always tagged too.
#
# Images (D-104, D-120): ${KVITT_REGISTRY}/kvitt-server (context server/) and kvitt-backup (infra/backup).
# KVITT_REGISTRY and the optional credentials come from infra/secrets/registry.env (git-ignored):
#   KVITT_REGISTRY=gitea.lan/jacobh2
#   KVITT_REGISTRY_USER=<gitea user>          optional
#   KVITT_REGISTRY_TOKEN=<token, write:package>  optional
# Without that file the images are built locally and the exact push commands are printed instead.
# Refuses a dirty working tree, and refuses to run while a Gradle build holds the gradle-serial lock (CLAUDE.md).
# Works with Docker (buildx) and with Podman (this Mac's `docker`); the registry is plain HTTP on the home Wi-Fi.
set -euo pipefail
repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$repo_root"
# shellcheck source=../tools/gradle-lock.sh
. "$repo_root/tools/gradle-lock.sh"

[[ -z "$(git status --porcelain)" ]] || { echo "build-images.sh: the working tree is dirty; commit or stash first." >&2; exit 1; }
if pid="$(gradle_lock_holder)"; then
  echo "build-images.sh: a Gradle build is running (pid $pid); try again when it is done." >&2
  exit 1
fi

tag="${1:-$(git rev-parse --short HEAD)}"
[[ "$tag" =~ ^[A-Za-z0-9_][A-Za-z0-9_.-]{0,127}$ ]] || { echo "build-images.sh: not a valid tag: $tag" >&2; exit 2; }

reg_file="$repo_root/infra/secrets/registry.env"
default_registry="gitea.lan/jacobh2"   # SPEC §10.3, D-104
registry="$default_registry"; user=""; token=""; push=0
if [[ -f "$reg_file" ]]; then
  value() { sed -n "s/^$1=//p" "$reg_file" | tail -n 1; }
  registry="$(value KVITT_REGISTRY)"; registry="${registry:-$default_registry}"
  user="$(value KVITT_REGISTRY_USER)"; token="$(value KVITT_REGISTRY_TOKEN)"
  push=1
fi
registry_host="${registry%%/*}"

# name|context|dockerfile
images=(
  "kvitt-server|server|server/Dockerfile"
  "kvitt-backup|infra/backup|infra/backup/Dockerfile"
)

if docker version 2>/dev/null | grep -qi podman; then engine=podman; else engine=docker; fi
echo "Engine: $engine; registry: $registry; tag: $tag (and latest); push: $([[ $push == 1 ]] && echo yes || echo no)"

if [[ $push == 1 && -n "$user" && -n "$token" ]]; then
  if [[ $engine == podman ]]; then
    printf '%s' "$token" | podman login --tls-verify=false "$registry_host" -u "$user" --password-stdin
  else
    printf '%s' "$token" | docker login "$registry_host" -u "$user" --password-stdin
  fi
fi

if [[ $engine == docker && $push == 1 ]]; then
  # A buildx builder that may push to the plain-HTTP registry (same rule as the Gitea workflow).
  if ! docker buildx inspect kvitt-http-builder >/dev/null 2>&1; then
    cfg="$(mktemp)"
    trap 'rm -f "$cfg"' EXIT
    printf '[registry."%s"]\n  http = true\n' "$registry_host" > "$cfg"
    docker buildx create --name kvitt-http-builder --config "$cfg" >/dev/null
    rm -f "$cfg"
    trap - EXIT
  fi
fi

for spec in "${images[@]}"; do
  IFS='|' read -r name context dockerfile <<< "$spec"
  ref="$registry/$name"
  echo "== $ref:$tag"
  if [[ $engine == podman ]]; then
    podman build --platform linux/arm64 -f "$dockerfile" -t "$ref:$tag" -t "$ref:latest" "$context"
    if [[ $push == 1 ]]; then
      podman push --tls-verify=false "$ref:$tag"
      podman push --tls-verify=false "$ref:latest"
    fi
  elif [[ $push == 1 ]]; then
    # --provenance=false: push a plain image manifest, as Podman does, rather than an index with an attestation
    # entry (same choice as the Gitea workflow).
    docker buildx build --builder kvitt-http-builder --platform linux/arm64 --provenance=false -f "$dockerfile" \
      -t "$ref:$tag" -t "$ref:latest" --push "$context"
  else
    docker buildx build --platform linux/arm64 -f "$dockerfile" -t "$ref:$tag" -t "$ref:latest" --load "$context"
  fi
done

if [[ $push == 1 ]]; then
  echo "Pushed. On the Pi: cd ~/kvitt, set KVITT_TAG=$tag in .env, then docker compose pull && docker compose up -d"
else
  echo
  echo "Built locally, not pushed: $reg_file does not exist. To push, create it (KVITT_REGISTRY=$registry, plus"
  echo "KVITT_REGISTRY_USER and KVITT_REGISTRY_TOKEN if Gitea needs them) and run this script again, or push by hand:"
  for spec in "${images[@]}"; do
    IFS='|' read -r name _ _ <<< "$spec"
    if [[ $engine == podman ]]; then
      echo "  podman push --tls-verify=false $registry/$name:$tag && podman push --tls-verify=false $registry/$name:latest"
    else
      echo "  docker push $registry/$name:$tag && docker push $registry/$name:latest   # needs $registry_host in insecure-registries"
    fi
  done
fi