FROM mirror.gcr.io/library/golang:1.24-alpine AS builder

RUN sed -i 's/dl-cdn.alpinelinux.org/uk.alpinelinux.org/g' /etc/apk/repositories && \
    apk add --no-cache git ca-certificates tzdata

WORKDIR /build

COPY go.mod go.sum ./
# --mount=type=cache permite que o Go use cache de módulos entre builds sem inflar a imagem
RUN --mount=type=cache,target=/go/pkg/mod \
    go mod download && go mod verify

COPY . .

# Ajuste: -p 2 para não estressar a CPU do servidor e causar Erro 500 no Forgejo
RUN --mount=type=cache,target=/root/.cache/go-build \
    CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
    -p 2 \
    -ldflags="-s -w" \
    -trimpath \
    -o /app/main ./cmd/api

FROM scratch AS runner

COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /app/main /main
COPY --from=builder /build/migrations /migrations

# GOGC=50 é agressivo (bom para economizar RAM), mas aumenta uso de CPU. 
# Se o servidor estiver travando por CPU, tente GOGC=100.
ENV PORT=8521 \
    TZ=America/Sao_Paulo \
    GODEBUG=netdns=go \
    GOGC=50

EXPOSE 8521
ENTRYPOINT ["/main"]