# ── Build stage ────────────────────────────────────────────────────────────────
FROM golang:1.25-alpine AS builder

WORKDIR /build

# Cache dependency downloads separately from source compilation.
COPY go.mod go.sum ./
RUN go mod download

COPY . .

RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
    go build -ldflags="-s -w" -o /scraper ./cmd/scraper

# ── Runtime stage ──────────────────────────────────────────────────────────────
# Use node:22-alpine so single-file-cli (npm package) runs natively without
# any glibc shims.  The pre-compiled binary release requires glibc symbols
# (e.g. __res_init) that Alpine's gcompat shim does not provide.
FROM node:22-alpine

# ca-certificates: HTTPS to novelfire.net
# tzdata: timezone data
RUN apk add --no-cache ca-certificates tzdata

# Install single-file-cli as a global npm package.
# It runs via Node.js (no Deno/glibc needed) and connects to an external
# Chromium via the CDP --browser-server flag.
RUN npm install -g single-file-cli

WORKDIR /app

COPY --from=builder /scraper /app/scraper

# Create the default static output directory.
RUN mkdir -p /app/static/books

# Non-root user.
RUN addgroup -S scraper && adduser -S scraper -G scraper
RUN chown -R scraper:scraper /app
USER scraper

# ── Configuration ─────────────────────────────────────────────────────────────
ENV BROWSERLESS_URL=http://browserless:3030
ENV BROWSERLESS_STRATEGY=content
ENV SCRAPER_WORKERS=0
ENV SCRAPER_STATIC_ROOT=/app/static/books
ENV SCRAPER_HTTP_ADDR=:8080
ENV SINGLEFILE_PATH=single-file

EXPOSE 8080

# Default: run as an HTTP server. Override CMD to use "run" for one-shot.
ENTRYPOINT ["/app/scraper"]
CMD ["serve"]