# ─────────────────────────────────────────────────────────────────────────────
# negative-converter — Multi-Stage Build Image
#
# Stages:
#   base            — Gemeinsame Tools (cmake, ninja, gcc)
#   linux-builder   — Linux-Build mit OpenCV, LibRaw, Qt6
#   windows-builder — Windows Cross-Compilation via MXE + MinGW-w64
#
# Verwendung:
#   docker build --target linux-builder  -t negative-converter:linux   .
#   docker build --target windows-builder -t negative-converter:windows .
# ─────────────────────────────────────────────────────────────────────────────

# Ubuntu 22.04 LTS für Linux-Build
FROM ubuntu:22.04 AS base

ENV DEBIAN_FRONTEND=noninteractive \
    TZ=UTC

RUN apt-get update && apt-get install -y --no-install-recommends \
    # Build-Tools
    cmake \
    ninja-build \
    build-essential \
    pkg-config \
    git \
    # Hilfswerkzeuge
    wget \
    curl \
    unzip \
    zip \
    ca-certificates \
    gnupg \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /project

# ─────────────────────────────────────────────────────────────────────────────
# Stage: linux-builder
# Linux-Build mit OpenCV, LibRaw, Qt6
# ─────────────────────────────────────────────────────────────────────────────
FROM base AS linux-builder

RUN apt-get update && apt-get install -y --no-install-recommends \
    # OpenCV
    libopencv-dev \
    # LibRaw
    libraw-dev \
    # Qt6
    qt6-base-dev \
    libqt6widgets6 \
    libxkbcommon-dev \
    # GTest für Tests
    libgtest-dev \
    # OpenGL (Qt-Abhängigkeit)
    libgl1-mesa-dev \
    && rm -rf /var/lib/apt/lists/*

COPY . /project

# Standard: Release ohne GUI (GUI benötigt X11/Display)
RUN cmake -B build -G Ninja \
        -DCMAKE_BUILD_TYPE=Release \
        -DBUILD_GUI=OFF \
        -DBUILD_TESTS=ON \
    && cmake --build build --parallel "$(nproc)" \
    && ctest --test-dir build --output-on-failure

ENTRYPOINT ["./build/negative-converter"]
CMD ["--batch", "--config", "config.ini"]

# ─────────────────────────────────────────────────────────────────────────────
# Stage: windows-builder
# Windows Cross-Compilation via MXE (MinGW-w64 + statisch gelinkte Deps)
# MXE-Pakete sind für Ubuntu 20.04 (focal) gebaut → eigene Base nötig
# ─────────────────────────────────────────────────────────────────────────────
FROM ubuntu:20.04 AS windows-builder

ENV DEBIAN_FRONTEND=noninteractive \
    TZ=UTC

RUN apt-get update && apt-get install -y --no-install-recommends \
    ninja-build \
    build-essential \
    pkg-config \
    curl \
    ca-certificates \
    gnupg \
    apt-transport-https \
    && rm -rf /var/lib/apt/lists/*

# CMake 3.20+ von Kitware (Ubuntu 20.04 liefert nur 3.16)
RUN curl -fsSL https://apt.kitware.com/keys/kitware-archive-latest.asc \
        | gpg --dearmor -o /usr/share/keyrings/kitware-archive-keyring.gpg \
    && echo "deb [signed-by=/usr/share/keyrings/kitware-archive-keyring.gpg] https://apt.kitware.com/ubuntu/ focal main" \
        > /etc/apt/sources.list.d/kitware.list \
    && apt-get update && apt-get install -y --no-install-recommends cmake \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /project

# MXE Repository einrichten (focal = Ubuntu 20.04)
RUN curl -fsSL "https://pkg.mxe.cc/repos/apt/client-conf/mxeapt.gpg" \
        | gpg --dearmor -o /usr/share/keyrings/mxeapt.gpg \
    && echo "deb [arch=amd64 signed-by=/usr/share/keyrings/mxeapt.gpg] https://pkg.mxe.cc/repos/apt focal main" \
        > /etc/apt/sources.list.d/mxeapt.list

# MXE-Pakete: OpenCV + LibRaw (statisch, x86_64)
# Hinweis: MXE unterstützt kein Qt6 → Windows-Build als CLI ohne GUI
# Initial-Download ~1-2 GB, dauert je nach Bandbreite 5-15 Min.
RUN apt-get update && apt-get install -y --no-install-recommends \
    mxe-x86-64-w64-mingw32.static-cmake \
    mxe-x86-64-w64-mingw32.static-opencv \
    mxe-x86-64-w64-mingw32.static-libraw \
    mxe-x86-64-w64-mingw32.static-cc \
    && rm -rf /var/lib/apt/lists/*

ENV MXE_PREFIX=/usr/lib/mxe/usr/x86_64-w64-mingw32.static \
    PATH="/usr/lib/mxe/usr/bin:${PATH}"

COPY . /project

# System-cmake (3.20+) mit MXE-Toolchain und TryRunResults
RUN cmake -B build-windows -G Ninja \
        -DCMAKE_TOOLCHAIN_FILE="${MXE_PREFIX}/share/cmake/mxe-conf.cmake" \
        -C /usr/lib/mxe/usr/share/cmake/modules/TryRunResults.cmake \
        -DCMAKE_BUILD_TYPE=Release \
        -DCMAKE_INSTALL_PREFIX=/project/dist-windows \
        -DBUILD_GUI=OFF \
        -DBUILD_TESTS=OFF \
    && cmake --build build-windows --parallel "$(nproc)" \
    && cmake --install build-windows

# Ergebnis: /project/dist-windows/bin/negative-converter.exe
ENTRYPOINT ["/bin/bash"]