# Multi-stage build for SubConverter-Go
# ======================================

# Stage 1: Build stage
FROM golang:1.21-alpine AS builder

# Install build dependencies
RUN apk add --no-cache git

# 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 with ldflags
RUN CGO_ENABLED=0 GOOS=linux go build \
    -ldflags="-w -s -X 'main.Version=1.0.0' -X 'main.BuildTime=$(date -u '+%Y-%m-%d %H:%M:%S')'" \
    -a -installsuffix cgo \
    -o subconverter-go main.go

# Stage 2: Runtime stage
FROM alpine:latest

# Install ca-certificates for HTTPS
RUN apk --no-cache add ca-certificates tzdata

# Create non-root user
RUN addgroup -g 1001 -S appgroup && \
    adduser -u 1001 -S appuser -G appgroup

# Create directories
RUN mkdir -p /app/logs /app/config && \
    chown -R appuser:appgroup /app

# Set working directory
WORKDIR /app

# Copy binary from builder
COPY --from=builder /app/subconverter-go .

# Copy config file template
COPY config.yaml.example ./config.yaml.example

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 25500

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:25500/health || exit 1

# Run the application
CMD ["./subconverter-go", "--config", "/app/config.yaml"]