# syntax=docker/dockerfile:1.6

###############################################
# Build stage: compile Flutter web artifacts. #
###############################################
FROM ubuntu:22.04 AS build

ENV DEBIAN_FRONTEND=noninteractive \
    FLUTTER_CHANNEL=stable \
    FLUTTER_VERSION=3.24.3 \
    FLUTTER_HOME=/opt/flutter

RUN apt-get update && \
    apt-get install -y --no-install-recommends \
        ca-certificates \
        curl \
        git \
        unzip \
        xz-utils \
        zip \
        libglu1-mesa && \
    rm -rf /var/lib/apt/lists/*

RUN curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/${FLUTTER_CHANNEL}/linux/flutter_linux_${FLUTTER_VERSION}-${FLUTTER_CHANNEL}.tar.xz" \
    | tar -xJ -C /opt && \
    ln -s ${FLUTTER_HOME} /usr/local/flutter

ENV PATH="${FLUTTER_HOME}/bin:${FLUTTER_HOME}/bin/cache/dart-sdk/bin:${PATH}"

RUN flutter config --enable-web && \
    flutter doctor -v

WORKDIR /app

COPY pubspec.yaml pubspec.lock ./
RUN flutter pub get

COPY . .
RUN flutter build web --release

##########################################
# Runtime stage: serve assets via nginx. #
##########################################
FROM ubuntu:22.04 AS runner

ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update && \
    apt-get install -y --no-install-recommends nginx && \
    rm -rf /var/lib/apt/lists/*

# Remove default site definition to avoid duplicate configs.
RUN rm -f /etc/nginx/sites-enabled/default

# Provide a minimal nginx site config for the Flutter web assets.
RUN printf 'server {\n\
    listen 80 default_server;\n\
    listen [::]:80 default_server;\n\
    root /var/www/html;\n\
    index index.html;\n\
    location / {\n\
        try_files $uri $uri/ /index.html;\n\
    }\n\
}\n' > /etc/nginx/conf.d/flutter.conf

COPY --from=build /app/build/web /var/www/html

EXPOSE 80

CMD ["nginx", "-g", "daemon off;"]