# backend/Dockerfile.dev
# Development Dockerfile with hot reload support

# Stage 1: Base image with Go tools
FROM golang:1.25-alpine AS base

# Install developement tools
# - git: Required for go get
# - gcc, musl-dev: Required for CGO (some packages need C compiler)
# - air: Hot reload tool for GO
RUN apk add --no-cache \
    git \
    gcc \
    musl-dev && \
    go install github.com/air-verse/air@latest


# Set working directory
WORKDIR /app

# Stage 2: Development environment
FROM base as development

# Copy dependency files first (for layer caching)
COPY go.mod go.sum ./

# Download dependencies
# This layer is cached unless go.mod or go.sum changes
RUN go mod download

# Copy Air configuration

COPY .air.toml ./
# EXPOSE port 8080 for API
# This is documentation only - doesn't actually expose port
EXPOSE 8080

# Use Air for hot reload
# Air watches for file changes and recompiles automatically
CMD [ "air", "-c", ".air.toml" ]