# Build stage
FROM golang:1.25-alpine AS builder

# Install build dependencies
RUN apk add --no-cache git ca-certificates tzdata

# Set working directory
WORKDIR /build

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

# Download dependencies
RUN go mod download

# Copy source code
COPY . .

# Build the binary
# CGO_ENABLED=0 for static binary (no C dependencies)
# -ldflags="-s -w" strips debug info to reduce binary size
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
    -ldflags="-s -w" \
    -o /build/vaultwarden-api \
    ./cmd/api

# Final stage - minimal runtime image
FROM alpine:3.19

# Install CA certificates for HTTPS and wget for healthcheck
RUN apk --no-cache add ca-certificates wget

# Create non-root user for security
RUN addgroup -g 1000 appuser && \
    adduser -D -u 1000 -G appuser appuser

# Set working directory
WORKDIR /app

# Copy binary from builder
COPY --from=builder /build/vaultwarden-api .

# Change ownership to non-root user
RUN chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1

# Run the application
ENTRYPOINT ["/app/vaultwarden-api"]