# Multi-platform build container for Gopherbook
FROM golang:alpine AS builder

RUN apk add --no-cache \
    musl-dev \
    gcc \
    g++ \
    mingw-w64-gcc \
    wget \
    xz \
    git

# Install UPX for binary compression
RUN wget https://github.com/upx/upx/releases/download/v5.0.2/upx-5.0.2-amd64_linux.tar.xz && \
    tar -xf upx-5.0.2-amd64_linux.tar.xz && \
    mv upx-5.0.2-amd64_linux/upx /usr/local/bin/upx && \
    rm -r upx-5.0.2-amd64_linux upx-5.0.2-amd64_linux.tar.xz

WORKDIR /app

COPY go.mod go.sum ./
RUN go mod download

COPY . .

# Build Linux binary
RUN echo "Building Linux binary..." && \
    CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build \
    -a \
    -ldflags="-s -w -linkmode external -extldflags '-static'" \
    -trimpath \
    -o bin/gopherbook-linux ./app/gopherbook && \
    upx --best --ultra-brute bin/gopherbook-linux && \
    chmod +x bin/gopherbook-linux

# Build Windows binary
RUN echo "Building Windows binary..." && \
    echo 'IDI_ICON1 ICON "./app/gopherbook/static/images/favicon/favicon.ico"' > gopherbook.rc && \
    x86_64-w64-mingw32-windres gopherbook.rc -o ./app/gopherbook/gopherbook.syso && \
    CGO_ENABLED=1 GOOS=windows GOARCH=amd64 CC=x86_64-w64-mingw32-gcc go build \
    -a \
    -ldflags="-s -w" \
    -trimpath \
    -o bin/gopherbook-windows.exe ./app/gopherbook && \
    upx --best --ultra-brute bin/gopherbook-windows.exe && \
    rm ./app/gopherbook/gopherbook.syso gopherbook.rc

# Verify binaries were created
RUN ls -lh bin/ && \
    echo "Build complete!" && \
    echo "Linux binary size: $(du -h bin/gopherbook-linux | cut -f1)" && \
    echo "Windows binary size: $(du -h bin/gopherbook-windows.exe | cut -f1)"

# Keep the builder stage as the final stage so we can copy files out
FROM builder