/**
 * dockerfile.ts — Gerador de Dockerfiles production-ready
 */
import type { DockerfileOptions } from './types';

export function generateDockerfile(o: DockerfileOptions): { content: string; stages: number; mb: number } {
  const v = o.nodeVersion || '20';

  switch (o.stack) {
    case 'nextjs': return nextjs(v);
    case 'nestjs': return nestjs(v);
    case 'nuxt':   return nuxt(v);
    case 'laravel':return laravel(o.phpVersion);
    case 'php-generic': return php(o.phpVersion);
    case 'python': return python(o.pythonVersion);
    case 'go':     return go(o.nodeVersion);
    case 'rust':   return rust();
    case 'wordpress': return { content: '# Use xCloud Native', stages: 0, mb: 0 };
    case 'nodejs': return nodejs(v);
    default: return { content: '# Unknown stack', stages: 0, mb: 0 };
  }
}

/* ─── NODE: Express/Fastify ─── */
function nodejs(v: string) {
  return {
    content: `FROM node:${v}-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json* ./
RUN npm ci --omit=dev
COPY . .

FROM node:${v}-alpine
WORKDIR /app
ENV NODE_ENV=production
COPY --from=deps /app/node_modules ./node_modules
COPY --from=deps /app .
EXPOSE 3000
CMD ["node", "server.js"]`,
    stages: 2, mb: 140,
  };
}

/* ─── NEXT.JS standalone ─── */
function nextjs(v: string) {
  return {
    content: `FROM node:${v}-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json* ./
RUN npm ci

FROM node:${v}-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
ENV NEXT_TELEMETRY_DISABLED=1
RUN npm run build

FROM node:${v}-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static
COPY --from=builder /app/public ./public
EXPOSE 3000
ENV PORT=3000
ENV HOSTNAME=0.0.0.0
CMD ["node", "server.js"]`,
    stages: 3, mb: 180,
  };
}

/* ─── NESTJS ─── */
function nestjs(v: string) {
  return {
    content: `FROM node:${v}-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json* ./
RUN npm ci --omit=dev

FROM node:${v}-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

FROM node:${v}-alpine
WORKDIR /app
ENV NODE_ENV=production
COPY --from=deps /app/node_modules ./node_modules
COPY --from=builder /app/dist ./dist
COPY package.json ./
EXPOSE 3000
CMD ["node", "dist/main"]`,
    stages: 3, mb: 170,
  };
}

/* ─── NUXT ─── */
function nuxt(v: string) {
  return {
    content: `FROM node:${v}-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json* ./
RUN npm ci

FROM node:${v}-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

FROM node:${v}-alpine
WORKDIR /app
ENV NODE_ENV=production
ENV NITRO_PORT=3000
ENV NITRO_HOST=0.0.0.0
COPY --from=builder /app/.output ./.output
EXPOSE 3000
CMD ["node", ".output/server/index.mjs"]`,
    stages: 3, mb: 170,
  };
}

/* ─── LARAVEL ─── */
function laravel(v: string = '8.3') {
  return {
    content: `FROM php:${v}-fpm-alpine
RUN apk add --no-cache git curl libpng-dev libxml2-dev zip unzip nodejs npm
RUN docker-php-ext-install pdo pdo_mysql bcmath gd opcache
RUN echo "opcache.enable=1" > /usr/local/etc/php/conf.d/opcache.ini &&     echo "opcache.memory_consumption=256" >> /usr/local/etc/php/conf.d/opcache.ini
COPY --from=composer:2.7 /usr/bin/composer /usr/bin/composer
WORKDIR /var/www/html
COPY composer.json composer.lock ./
RUN composer install --no-dev --no-scripts --prefer-dist
COPY . .
RUN composer dump-autoload --optimize
RUN chown -R www-data:www-data /var/www/html/storage /var/www/html/bootstrap/cache
EXPOSE 9000
CMD ["php-fpm"]`,
    stages: 1, mb: 220,
  };
}

/* ─── PHP genérico ─── */
function php(v: string = '8.3') {
  return {
    content: `FROM php:${v}-apache
RUN a2enmod rewrite headers
RUN docker-php-ext-install pdo pdo_mysql mysqli
COPY --from=composer:2.7 /usr/bin/composer /usr/bin/composer
ENV APACHE_DOCUMENT_ROOT=/var/www/html/public
RUN sed -ri -e 's!/var/www/html!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/sites-available/*.conf
WORKDIR /var/www/html
COPY composer.json composer.lock* ./
RUN composer install --no-dev --no-scripts --prefer-dist
COPY . .
RUN chown -R www-data:www-data /var/www/html
EXPOSE 80
CMD ["apache2-foreground"]`,
    stages: 1, mb: 200,
  };
}

/* ─── PYTHON FastAPI ─── */
function python(v: string | undefined) {
  const pv = v || '3.12';
  return {
    content: `FROM python:${pv}-slim
WORKDIR /app
RUN apt-get update && apt-get install -y --no-install-recommends build-essential curl && rm -rf /var/lib/apt/lists/*
COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt
COPY . .
RUN useradd -m -u 1001 appuser && chown -R appuser:appuser /app
USER appuser
EXPOSE 8000
ENV PORT=8000
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "2"]`,
    stages: 1, mb: 250,
  };
}

/* ─── GO ─── */
function go(v: string | undefined) {
  const gv = v || '1.22';
  return {
    content: `FROM golang:${gv}-alpine AS builder
WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o app .

FROM alpine:3.19
RUN apk add --no-cache ca-certificates
COPY --from=builder /app/app /usr/local/bin/app
USER 1001
EXPOSE 8080
ENV PORT=8080
CMD ["app"]`,
    stages: 2, mb: 40,
  };
}

/* ─── RUST ─── */
function rust() {
  return {
    content: `FROM rust:1.75-slim AS builder
WORKDIR /app
COPY Cargo.toml Cargo.lock ./
COPY src ./src
RUN cargo build --release

FROM debian:bookworm-slim
RUN apt-get update && apt-get install -y --no-install-recommends libssl3 ca-certificates && rm -rf /var/lib/apt/lists/*
COPY --from=builder /app/target/release/app /usr/local/bin/app
USER 1001
EXPOSE 8080
ENV PORT=8080
CMD ["app"]`,
    stages: 2, mb: 60,
  };
}