# syntax=docker/dockerfile:1

# --- Build stage -------------------------------------------------------------
# Compile a static Go binary. The Vue panel is pre-built into internal/api/dist
# and embedded via //go:embed, so no Node toolchain is needed here.
FROM golang:1.26-alpine3.24 AS build

WORKDIR /src

# Cache module downloads separately from the source for faster rebuilds.
COPY go.mod ./
# go.sum is optional (stdlib-only module today); copy it if present.
COPY go.su[m] ./
RUN go mod download

COPY . .

# CGO_ENABLED=0 produces a static binary that runs on a bare alpine image. The
# entry point is the cmd/server package.
RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/api-server ./cmd/server

# --- Runtime stage -----------------------------------------------------------
FROM alpine:3.24

# HTTPS calls to PocketBase need CA certificates; tzdata for correct timestamps.
RUN apk add --no-cache ca-certificates tzdata

# Run as an unprivileged user.
RUN addgroup -S app && adduser -S -G app app

COPY --from=build /out/api-server /usr/local/bin/api-server

# The server keeps no state on disk: plugin settings, like everything else, live
# in PocketBase. The working directory is only where a .env would be read from
# at startup if one were mounted, which is a local-development convenience — in
# Docker every setting arrives as an environment variable. So no volume, and
# nothing to make writable beyond the image layer itself.
RUN mkdir -p /app && chown app:app /app
WORKDIR /app

# Config comes entirely from environment variables (see .env.example).
# POCKETBASE_ADMIN_EMAIL / _PASSWORD are optional at startup: without them the
# server still runs and a superadmin can configure the connection from the panel.
ENV API_ADDR=:8080
EXPOSE 8080

# Liveness only: /healthz answers 200 as soon as the process is serving, and
# does not depend on PocketBase, so a database outage does not mark the
# container unhealthy. Lets compose gate dependants on condition: service_healthy.
HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
    CMD wget -qO- http://127.0.0.1:8080/healthz >/dev/null 2>&1 || exit 1

USER app

ENTRYPOINT ["/usr/local/bin/api-server"]