"""Dockerfile and package.json generator for JS/TS frameworks.

Auto-generates Dockerfile, package.json, and .dockerignore for
React, Next.js, Vue.js, Express, NestJS, and plain Node.js projects
so they can be pushed to HuggingFace Docker Spaces.
"""

from __future__ import annotations

import re
from typing import Any

# ─── Framework Detection ────────────────────────────────────────────────

# Keywords in code that identify a framework
FRAMEWORK_SIGNALS: dict[str, list[str]] = {
    "nextjs": [
        "from 'next", 'from "next',
        "next/link", "next/image", "next/router", "next/head",
        "NextResponse", "NextRequest", "next/navigation",
        "getServerSideProps", "getStaticProps",
    ],
    "react": [
        "from 'react", 'from "react',
        "react-dom", "ReactDOM", "useState", "useEffect",
        "jsx", "tsx", "React.Component", "React.createElement",
    ],
    "vue": [
        "from 'vue", 'from "vue',
        "createApp", "Vue.createApp", "<template>",
        "defineComponent", "ref(", "reactive(",
    ],
    "express": [
        "require('express')", 'require("express")',
        "from 'express", 'from "express',
        "express()", "express.Router",
    ],
    "nestjs": [
        "@Module", "@Controller", "@Get", "@Post", "@Put", "@Delete",
        "from '@nestjs", 'from "@nestjs',
        "NestFactory.create",
    ],
    "nodejs": [
        "require('http')", "http.createServer",
        "const http = require", "import http from",
    ],
}


def detect_framework(files: dict[str, str]) -> str:
    """Detect the JS/TS framework from project files.

    Returns one of: 'nextjs', 'react', 'vue', 'express', 'nestjs', 'nodejs', 'static'
    """
    all_code = "\n".join(files.values())

    # Check file names first (strong signal)
    has_next_config = any(
        f.startswith("next.config") for f in files
    )
    if has_next_config:
        return "nextjs"

    # Check package.json if present
    for fname, content in files.items():
        if fname == "package.json" or fname.endswith("/package.json"):
            try:
                import json
                pkg = json.loads(content)
                deps = {**pkg.get("dependencies", {}), **pkg.get("devDependencies", {})}
                if "next" in deps:
                    return "nextjs"
                if "vue" in deps or "@vue/cli-service" in deps:
                    return "vue"
                if "@nestjs/core" in deps:
                    return "nestjs"
                if "express" in deps:
                    return "express"
                if "react" in deps or "react-dom" in deps:
                    return "react"
            except Exception:
                pass

    # Check code content for framework signals
    for fw, signals in FRAMEWORK_SIGNALS.items():
        for signal in signals:
            if signal in all_code:
                return fw

    # Check file extensions
    has_jsx_tsx = any(f.endswith((".jsx", ".tsx")) for f in files)
    has_vue = any(f.endswith(".vue") for f in files)

    if has_vue:
        return "vue"
    if has_jsx_tsx:
        return "react"

    return "static"


def is_js_project(files: dict[str, str]) -> bool:
    """Check if the project is a JavaScript/TypeScript project."""
    js_extensions = {".js", ".jsx", ".ts", ".tsx", ".vue", ".mjs", ".cjs"}
    has_package_json = any("package.json" in f for f in files)
    has_js_files = any(
        any(f.endswith(ext) for ext in js_extensions)
        for f in files
    )
    return has_package_json or has_js_files


# ─── Dockerfile Templates ───────────────────────────────────────────────

def _dockerfile_nextjs() -> str:
    """Dockerfile for Next.js projects."""
    return """FROM node:20-slim AS base

# Install dependencies only when needed
FROM base AS deps
WORKDIR /app
COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
RUN \\
  if [ -f yarn.lock ]; then yarn --frozen-lockfile; \\
  elif [ -f package-lock.json ]; then npm ci; \\
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \\
  else npm i; \\
  fi

# Rebuild source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

# Production image
FROM base AS runner
WORKDIR /app
ENV NODE_ENV=production
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs
COPY --from=builder /app/public ./public
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
USER nextjs
EXPOSE 3000
ENV PORT=3000
ENV HOSTNAME="0.0.0.0"
CMD ["node", "server.js"]
"""


def _dockerfile_react() -> str:
    """Dockerfile for React (Vite/CRA) projects — served with nginx."""
    return """FROM node:20-slim AS build
WORKDIR /app
COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
RUN \\
  if [ -f yarn.lock ]; then yarn --frozen-lockfile; \\
  elif [ -f package-lock.json ]; then npm ci; \\
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \\
  else npm i; \\
  fi
COPY . .
RUN npm run build

FROM nginx:alpine
COPY --from=build /app/build /usr/share/nginx/html
COPY --from=build /app/dist /usr/share/nginx/html 2>/dev/null || true
RUN cat > /etc/nginx/conf.d/default.conf << 'EOF'
server {
    listen 7860;
    server_name localhost;
    root /usr/share/nginx/html;
    index index.html;
    location / {
        try_files $uri $uri/ /index.html;
    }
}
EOF
EXPOSE 7860
CMD ["nginx", "-g", "daemon off;"]
"""


def _dockerfile_vue() -> str:
    """Dockerfile for Vue.js projects — served with nginx."""
    return """FROM node:20-slim AS build
WORKDIR /app
COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
RUN \\
  if [ -f yarn.lock ]; then yarn --frozen-lockfile; \\
  elif [ -f package-lock.json ]; then npm ci; \\
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \\
  else npm i; \\
  fi
COPY . .
RUN npm run build

FROM nginx:alpine
COPY --from=build /app/dist /usr/share/nginx/html
RUN cat > /etc/nginx/conf.d/default.conf << 'EOF'
server {
    listen 7860;
    server_name localhost;
    root /usr/share/nginx/html;
    index index.html;
    location / {
        try_files $uri $uri/ /index.html;
    }
}
EOF
EXPOSE 7860
CMD ["nginx", "-g", "daemon off;"]
"""


def _dockerfile_express() -> str:
    """Dockerfile for Express/Node.js server projects."""
    return """FROM node:20-slim
WORKDIR /app
COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
RUN \\
  if [ -f yarn.lock ]; then yarn --frozen-lockfile; \\
  elif [ -f package-lock.json ]; then npm ci; \\
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \\
  else npm i; \\
  fi
COPY . .
RUN addgroup --system --gid 1001 appuser && adduser --system --uid 1001 appuser
USER appuser
EXPOSE 7860
ENV PORT=7860
ENV HOST=0.0.0.0
CMD ["node", "index.js"]
"""


def _dockerfile_nestjs() -> str:
    """Dockerfile for NestJS projects."""
    return """FROM node:20-slim AS build
WORKDIR /app
COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
RUN \\
  if [ -f yarn.lock ]; then yarn --frozen-lockfile; \\
  elif [ -f package-lock.json ]; then npm ci; \\
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \\
  else npm i; \\
  fi
COPY . .
RUN npm run build

FROM node:20-slim
WORKDIR /app
COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
RUN \\
  if [ -f yarn.lock ]; then yarn --frozen-lockfile --production; \\
  elif [ -f package-lock.json ]; then npm ci --only=production; \\
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile --prod; \\
  else npm i --only=production; \\
  fi
COPY --from=build /app/dist ./dist
RUN addgroup --system --gid 1001 appuser && adduser --system --uid 1001 appuser
USER appuser
EXPOSE 7860
ENV PORT=7860
CMD ["node", "dist/main.js"]
"""


def generate_dockerfile(framework: str) -> str:
    """Generate a Dockerfile for the given framework.

    Args:
        framework: One of 'nextjs', 'react', 'vue', 'express', 'nestjs', 'nodejs', 'static'

    Returns:
        Dockerfile content as string.
    """
    templates = {
        "nextjs": _dockerfile_nextjs,
        "react": _dockerfile_react,
        "vue": _dockerfile_vue,
        "express": _dockerfile_express,
        "nestjs": _dockerfile_nestjs,
        "nodejs": _dockerfile_express,  # Same as express for plain Node
    }
    gen = templates.get(framework)
    if gen:
        return gen()
    # Fallback: generic node server
    return _dockerfile_express()


# ─── package.json Generator ─────────────────────────────────────────────

def _scan_js_imports(code: str) -> set[str]:
    """Scan JS/TS code for import/require statements and return package names."""
    packages = set()

    # ESM: import xxx from 'pkg' / import 'pkg'
    for m in re.finditer(r"import\s+.*?\s+from\s+['\"](@?[\w-]+/[\w-]+|[\w-]+)", code):
        packages.add(m.group(1))

    # ESM: import 'pkg'
    for m in re.finditer(r"import\s+['\"](@?[\w-]+/[\w-]+|[\w-]+)['\"]", code):
        packages.add(m.group(1))

    # CJS: require('pkg')
    for m in re.finditer(r"require\s*\(\s*['\"](@?[\w-]+/[\w-]+|[\w-]+)['\"]\s*\)", code):
        packages.add(m.group(1))

    return packages


# Known packages that should NOT go in dependencies (built-in or types)
_SKIP_PACKAGES = {
    "react", "react-dom", "next", "vue", "express",
    "path", "fs", "http", "https", "url", "os", "crypto",
    "stream", "util", "events", "buffer", "child_process",
    "net", "tls", "zlib", "assert", "querystring",
}

# Framework-specific dependency sets
_FRAMEWORK_DEPS: dict[str, dict[str, str]] = {
    "nextjs": {
        "next": "14.2.0",
        "react": "^18.3.0",
        "react-dom": "^18.3.0",
    },
    "react": {
        "react": "^18.3.0",
        "react-dom": "^18.3.0",
        "react-scripts": "5.0.1",
    },
    "vue": {
        "vue": "^3.4.0",
    },
    "express": {
        "express": "^4.19.0",
    },
    "nestjs": {
        "@nestjs/core": "^10.3.0",
        "@nestjs/common": "^10.3.0",
        "@nestjs/platform-express": "^10.3.0",
        "reflect-metadata": "^0.2.0",
        "rxjs": "^7.8.0",
    },
    "nodejs": {},
}

# Common package version mapping
_PACKAGE_VERSIONS: dict[str, str] = {
    "axios": "^1.6.0",
    "lodash": "^4.17.21",
    "cors": "^2.8.5",
    "dotenv": "^16.4.0",
    "mongoose": "^8.2.0",
    "prisma": "^5.10.0",
    "@prisma/client": "^5.10.0",
    "zod": "^3.22.0",
    "socket.io": "^4.7.0",
    "multer": "^1.4.4",
    "cookie-parser": "^1.4.6",
    "express-session": "^1.18.0",
    "jsonwebtoken": "^9.0.0",
    "bcrypt": "^5.1.0",
    "uuid": "^9.0.0",
    "dayjs": "^1.11.10",
    "chart.js": "^4.4.0",
    "framer-motion": "^11.0.0",
    "lucide-react": "^0.350.0",
    "tailwindcss": "^3.4.0",
    "postcss": "^8.4.0",
    "autoprefixer": "^10.4.0",
    "@vitejs/plugin-react": "^4.2.0",
    "vite": "^5.1.0",
    "typescript": "^5.3.0",
    "@types/react": "^18.3.0",
    "@types/react-dom": "^18.3.0",
    "@types/node": "^20.11.0",
    "tailwind-merge": "^2.2.0",
    "clsx": "^2.1.0",
    "class-variance-authority": "^0.7.0",
    "@radix-ui/react-slot": "^1.0.2",
    "next-themes": "^0.3.0",
    "recharts": "^2.12.0",
    "react-hook-form": "^7.50.0",
    "@hookform/resolvers": "^3.3.0",
    "zustand": "^4.5.0",
    "jotai": "^2.6.0",
    "tanstack": "^5.24.0",
    "@tanstack/react-query": "^5.24.0",
    "swr": "^2.2.0",
    "nodemon": "^3.1.0",
    "ts-node": "^10.9.0",
    "ts-node-dev": "^2.0.0",
}


def generate_package_json(
    framework: str,
    project_name: str = "my-app",
    extra_deps: set[str] | None = None,
    existing_content: str | None = None,
) -> str:
    """Generate a package.json for the given framework.

    If existing_content is provided, merges dependencies into it.
    """
    import json

    # Start with existing or fresh
    if existing_content:
        try:
            pkg = json.loads(existing_content)
        except Exception:
            pkg = {}
    else:
        pkg = {}

    pkg.setdefault("name", project_name)
    pkg.setdefault("version", "1.0.0")
    pkg.setdefault("private", True)

    deps = pkg.get("dependencies", {})
    dev_deps = pkg.get("devDependencies", {})

    # Add framework core deps
    fw_deps = _FRAMEWORK_DEPS.get(framework, {})
    for name, version in fw_deps.items():
        deps[name] = version

    # Add scanned extra deps
    if extra_deps:
        for dep in extra_deps:
            if dep in _SKIP_PACKAGES:
                continue
            if dep in deps or dep in dev_deps:
                continue
            version = _PACKAGE_VERSIONS.get(dep, "^1.0.0")
            # Dev deps
            if dep.startswith("@types/") or dep in {"typescript", "nodemon", "ts-node", "ts-node-dev"}:
                dev_deps[dep] = version
            else:
                deps[dep] = version

    pkg["dependencies"] = deps
    if dev_deps:
        pkg["devDependencies"] = dev_deps

    # Add scripts based on framework
    scripts = pkg.get("scripts", {})
    if framework == "nextjs":
        scripts.setdefault("dev", "next dev")
        scripts.setdefault("build", "next build")
        scripts.setdefault("start", "next start -p 7860")
    elif framework in ("react",):
        scripts.setdefault("dev", "vite")
        scripts.setdefault("build", "vite build")
        scripts.setdefault("start", "vite preview --port 7860 --host 0.0.0.0")
        # Ensure vite is in devDeps
        if "vite" not in dev_deps and "vite" not in deps:
            dev_deps["vite"] = "^5.1.0"
        if "@vitejs/plugin-react" not in dev_deps:
            dev_deps["@vitejs/plugin-react"] = "^4.2.0"
    elif framework == "vue":
        scripts.setdefault("dev", "vite")
        scripts.setdefault("build", "vite build")
        scripts.setdefault("start", "vite preview --port 7860 --host 0.0.0.0")
        if "vite" not in dev_deps and "vite" not in deps:
            dev_deps["vite"] = "^5.1.0"
    elif framework in ("express", "nodejs"):
        scripts.setdefault("dev", "node index.js")
        scripts.setdefault("start", "node index.js")
    elif framework == "nestjs":
        scripts.setdefault("build", "nest build")
        scripts.setdefault("start", "node dist/main.js")

    pkg["scripts"] = scripts
    pkg["dependencies"] = deps
    if dev_deps:
        pkg["devDependencies"] = dev_deps

    return json.dumps(pkg, indent=2) + "\n"


# ─── .dockerignore ──────────────────────────────────────────────────────

DOCKERIGNORE = """node_modules
npm-debug.log*
yarn-debug.log*
yarn-error.log*
.next
.git
.gitignore
README.md
.env
.env.local
.env.production
.DS_Store
"""


# ─── Vite Config Generators ─────────────────────────────────────────────

def generate_vite_config(framework: str) -> str | None:
    """Generate a vite.config.js/ts if needed for React or Vue."""
    if framework == "react":
        return """import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'

export default defineConfig({
  plugins: [react()],
  server: {
    host: '0.0.0.0',
    port: 7860,
  },
})
"""
    if framework == "vue":
        return """import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'

export default defineConfig({
  plugins: [vue()],
  server: {
    host: '0.0.0.0',
    port: 7860,
  },
})
"""
    return None


# ─── Next.js Config ────────────────────────────────────────────────────

def generate_next_config() -> str:
    """Generate next.config.js with standalone output for Docker."""
    return """/** @type {import('next').NextConfig} */
const nextConfig = {
  output: 'standalone',
}

module.exports = nextConfig
"""


# ─── Public index.html for Vite ─────────────────────────────────────────

def generate_index_html(title: str = "App") -> str:
    """Generate a minimal index.html for Vite projects."""
    return f"""<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>{title}</title>
</head>
<body>
  <div id="root"></div>
  <script type="module" src="/src/main.jsx"></script>
</body>
</html>
"""


# ─── Full Project Scaffold ──────────────────────────────────────────────

def scaffold_js_project(
    files: dict[str, str],
    framework: str,
    project_name: str = "my-app",
) -> dict[str, str]:
    """Add Dockerfile, package.json, and config files to a JS project.

    Takes existing generated files and returns an augmented dict with
    Docker support files added.
    """
    augmented = dict(files)

    # Detect imports from all JS/TS files
    all_js_code = "\n".join(
        content for fname, content in files.items()
        if fname.endswith((".js", ".jsx", ".ts", ".tsx", ".vue", ".mjs"))
    )
    extra_deps = _scan_js_imports(all_js_code)

    # Add Dockerfile
    if "Dockerfile" not in augmented:
        augmented["Dockerfile"] = generate_dockerfile(framework)

    # Add .dockerignore
    if ".dockerignore" not in augmented:
        augmented[".dockerignore"] = DOCKERIGNORE

    # Add or merge package.json
    if "package.json" in augmented:
        augmented["package.json"] = generate_package_json(
            framework=framework,
            project_name=project_name,
            extra_deps=extra_deps,
            existing_content=augmented["package.json"],
        )
    else:
        augmented["package.json"] = generate_package_json(
            framework=framework,
            project_name=project_name,
            extra_deps=extra_deps,
        )

    # Framework-specific config files
    if framework == "nextjs" and "next.config.js" not in augmented and "next.config.mjs" not in augmented:
        augmented["next.config.js"] = generate_next_config()

    if framework in ("react", "vue"):
        vite_cfg = generate_vite_config(framework)
        if vite_cfg and "vite.config.js" not in augmented and "vite.config.ts" not in augmented:
            augmented["vite.config.js"] = vite_cfg

        # Add index.html entry point for Vite if not present
        if "index.html" not in augmented:
            augmented["index.html"] = generate_index_html(project_name)

    return augmented