# Stage 1: Build the Go application
FROM golang:1.25-alpine AS builder
WORKDIR /app

# Copy go.mod and go.sum files to download dependencies
COPY go.mod go.sum ./
RUN go mod download

# Copy the rest of the source code
COPY . .

# Build the application
# CGO_ENABLED=0 is important for a small static binary
# -o /app/server creates the binary in a known location
RUN CGO_ENABLED=0 GOOS=linux go build -o /app/server ./cmd/server

# Stage 2: Create the final, small image
FROM alpine:latest
WORKDIR /app

# Copy the static assets and templates
COPY --from=builder /app/public/assets ./public/assets
COPY --from=builder /app/public/templates ./public/templates

# Copy the compiled binary from the builder stage
COPY --from=builder /app/server .

# Expose the port the app runs on
EXPOSE 8080

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