FROM golang:1.24.5-alpine AS builder

WORKDIR /app

# Install build dependencies
RUN apk add --no-cache gcc musl-dev git

# Copy go mod and sum files
COPY go.mod go.sum ./

# Configure Go proxy with fallback and download dependencies with retry
ENV GOPROXY=https://proxy.golang.org,direct
ENV GOPRIVATE=
ENV GOSUMDB=sum.golang.org

# Download all dependencies with retry logic and cache mount
RUN --mount=type=cache,target=/go/pkg/mod \
    --mount=type=cache,target=/root/.cache/go-build \
    for i in 1 2 3 4 5; do \
        go mod download && break || \
        (echo "Attempt $i failed, retrying in 5s..." && sleep 5); \
    done && \
    go mod verify

# Copy the source code
COPY . .

# Build the application with cache mount and optimizations
RUN --mount=type=cache,target=/go/pkg/mod \
    --mount=type=cache,target=/root/.cache/go-build \
    CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
    go build -ldflags="-w -s" -trimpath -o main .

# Use a smaller image for the final container
FROM alpine:latest

WORKDIR /app

# Copy the binary from builder
COPY --from=builder /app/main .

# Copy static files and templates
COPY --from=builder /app/static ./static
COPY --from=builder /app/templates ./templates

# Expose port
EXPOSE 8080

# Command to run the executable
CMD ["./main"]