# Build stage
FROM golang:1.21-alpine AS builder

# Use Aliyun mirror for Alpine packages (China acceleration)
RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories

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

# Set Go proxy for China (use GOPROXY env from build args if provided)
ARG GOPROXY=https://goproxy.cn,https://goproxy.io,direct
ENV GOPROXY=${GOPROXY}
ENV GOSUMDB=sum.golang.google.cn

# Set working directory
WORKDIR /app

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

# Download dependencies
RUN go mod download

# Copy source code
COPY . .

# Build the application
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
    -ldflags="-w -s" \
    -o /bin/session-coordinator \
    ./services/session-coordinator/cmd/server

# Final stage
FROM alpine:3.18

# Use Aliyun mirror for Alpine packages (China acceleration)
RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories

# Install ca-certificates and curl for HTTPS and health check
RUN apk --no-cache add ca-certificates curl

# Create non-root user
RUN adduser -D -s /bin/sh mpc

# Copy binary from builder
COPY --from=builder /bin/session-coordinator /bin/session-coordinator

# Switch to non-root user
USER mpc

# Expose ports
EXPOSE 50051 8080

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD curl -sf http://localhost:8080/health || exit 1

# Run the application
ENTRYPOINT ["/bin/session-coordinator"]