# Stage 1 - Create yarn install skeleton layer
FROM node:20.18.1 AS packages

WORKDIR /app
COPY package.json yarn.lock ./

COPY packages packages

# Comment this out if you don't have any internal plugins
COPY plugins plugins

RUN find packages \! -name "package.json" -mindepth 2 -maxdepth 2 -exec rm -rf {} \+

# Stage 2 - Install dependencies and build packages
FROM node:20.18.1  AS build

# Required for arm64
RUN apt update -y
RUN apt install -y python3 make gcc build-essential bash

USER node
WORKDIR /app

COPY --from=packages --chown=node:node /app .

RUN --mount=type=cache,target=/home/node/.cache/yarn,sharing=locked,uid=1000,gid=1000 \
    yarn install --network-timeout 600000

COPY --chown=node:node . .

RUN yarn tsc
RUN yarn --cwd packages/backend build
# If you have not yet migrated to package roles, use the following command instead:
# RUN yarn --cwd packages/backend backstage-cli backend:bundle --build-dependencies

RUN mkdir packages/backend/dist/skeleton packages/backend/dist/bundle \
    && tar xzf packages/backend/dist/skeleton.tar.gz -C packages/backend/dist/skeleton \
    && tar xzf packages/backend/dist/bundle.tar.gz -C packages/backend/dist/bundle

# Stage 3 - Build the actual backend image and install production dependencies
FROM node:20.18.1 

# Install isolate-vm dependencies, these are needed by the @backstage/plugin-scaffolder-backend.
# Install packages needed to get utility binaries
RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
    --mount=type=cache,target=/var/lib/apt,sharing=locked \
    apt-get update && \
    apt-get install -y --no-install-recommends python3 python3-pip python3-venv g++ build-essential ca-certificates curl

RUN yarn config set python /usr/bin/python3

# Add kubectl for the kube apply plugin.
# Add mkdocs for the TechDocs plugin.
RUN if test "$(uname -m)" = "x86_64"; \
    then \
      curl -L -o /usr/local/bin/kubectl https://dl.k8s.io/release/v1.29.9/bin/linux/amd64/kubectl; \
    fi
RUN if test "$(uname -m)" != "x86_64"; \
    then \
      curl -L -o /usr/local/bin/kubectl https://dl.k8s.io/release/v1.29.9/bin/linux/arm64/kubectl; \
    fi
RUN chmod +x /usr/local/bin/kubectl

ENV VIRTUAL_ENV=/opt/venv
RUN python3 -m venv $VIRTUAL_ENV
ENV PATH="$VIRTUAL_ENV/bin:$PATH"
RUN pip3 install 'mkdocs-techdocs-core==1.4.2' 'mkdocs-awesome-pages-plugin==2.10.1'

# From here on we use the least-privileged `node` user to run the backend.
USER node

# This should create the app dir as `node`.
# If it is instead created as `root` then the `tar` command below will
# fail: `can't create directory 'packages/': Permission denied`.
# If this occurs, then ensure BuildKit is enabled (`DOCKER_BUILDKIT=1`)
# so the app dir is correctly created as `node`.
WORKDIR /app

# Copy the install dependencies from the build stage and context
COPY --from=build --chown=node:node /app/yarn.lock /app/package.json /app/packages/backend/dist/skeleton/ ./

RUN --mount=type=cache,target=/home/node/.cache/yarn,sharing=locked,uid=1000,gid=1000 \
    yarn install --production --network-timeout 600000

# Copy the built packages from the build stage
COPY --from=build --chown=node:node /app/packages/backend/dist/bundle/ ./

# Copy any other files that we need at runtime
COPY --chown=node:node app-config.yaml ./

# This switches many Node.js dependencies to production mode.
ENV NODE_ENV production

CMD ["node", "packages/backend", "--config", "app-config.yaml"]