# Source: https://oneuptime.com/blog/post/2026-01-07-go-hot-reloading-docker-air/view#step-3-create-the-development-dockerfile

# Dockerfile (Development)
# This Dockerfile is optimized for development with hot reloading
# It includes Air and mounts your source code as a volume

# Use the official Go image as our base
# Alpine variant is smaller but we use the full image for better compatibility
FROM golang:1.26-bookworm

# Set the working directory inside the container
# All subsequent commands will run from this directory
WORKDIR /app

# Shared modules (git.dcntrlized.org/dcntrlized/dcntrlized-auth) are served by
# the dev Gitea Go module proxy. Override via --build-arg in production.
ARG GOPROXY_VALUE=http://192.168.122.183:3000/api/packages/Dcntrlized/go
ARG GONOSUMDB_VALUE=git.dcntrlized.org
ENV GOPROXY=${GOPROXY_VALUE},https://proxy.golang.org,direct
ENV GONOSUMDB=${GONOSUMDB_VALUE}

# Install Air for hot reloading
# We install it globally so it's available in the PATH
RUN go install github.com/air-verse/air@latest

# Install additional development tools (optional but useful)
# - delve: Go debugger for debugging inside containers
# - golangci-lint: Linter for code quality checks
RUN go install github.com/go-delve/delve/cmd/dlv@latest && \
    curl -sSfL https://golangci-lint.run/install.sh | sh -s -- -b $(go env GOPATH)/bin v2.11.2

# Copy go.mod and go.sum first for better layer caching
# This layer only rebuilds when dependencies change
COPY src/go.mod src/go.sum* ./

# Download all dependencies
# This is cached separately from source code changes
RUN go mod download && go mod verify

# Copy the Air configuration file
# This tells Air how to watch and rebuild our application
COPY ./src/.air.toml ./

# Note: We do NOT copy source code here!
# Source code is mounted as a volume in Docker Compose
# This enables hot reloading without rebuilding the image

# Expose the application port
# Make sure this matches your application's listening port
EXPOSE 8080

# Expose delve debugger port (optional, for debugging)
EXPOSE 2345

# Set environment variables for development
ENV GO111MODULE=on

# Default command: persistent-delve hot-reload supervisor (src/dev/dlv-watch.sh).
# Unlike Air, it never kills the dlv server, so an attached VS Code debug
# session survives file saves (Delve's `restart` only re-launches the target).
# src/ is live-mounted at /app, so this runs the in-repo copy you can edit.
CMD ["bash", "/app/dev/dlv-watch.sh"]

##

LABEL org.dcntrlized.service=KeepNote
LABEL org.dcntrlized.port=8080