# Multi-stage build for nerd-monitor agent
FROM golang:1.24.4-alpine AS builder

WORKDIR /app

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

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

# Download dependencies
RUN go mod download

# Copy source code
COPY . .

# Build the agent binary (no templ needed for agent)
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o nerd-monitor-agent ./cmd/agent

# Runtime stage
FROM alpine:latest

WORKDIR /app

COPY --from=builder /app/nerd-monitor-agent .

# Create non-root user
RUN addgroup -D appgroup && adduser -D appuser -G appgroup
USER appuser

# Create entrypoint script to handle environment variables
RUN echo '#!/bin/sh\n\
SERVER=${SERVER:-localhost:8080}\n\
INTERVAL=${INTERVAL:-15s}\n\
AGENT_ID=${AGENT_ID:-}\n\
if [ -z "$AGENT_ID" ]; then\n\
  exec ./nerd-monitor-agent --server "$SERVER" --interval "$INTERVAL"\n\
else\n\
  exec ./nerd-monitor-agent --server "$SERVER" --interval "$INTERVAL" --id "$AGENT_ID"\n\
fi\n\
' > /app/entrypoint.sh && chmod +x /app/entrypoint.sh

# Run the agent
ENTRYPOINT ["/app/entrypoint.sh"]