/* eslint-env node */
import process from "node:process";
import path from "node:path";
import { fileURLToPath } from "node:url";
import js from "@eslint/js";
import tseslint from "typescript-eslint";
import prettier from "eslint-plugin-prettier";
import globals from "globals";

const __dirname = path.dirname(fileURLToPath(import.meta.url));

// Dynamically import Next.js ESLint configs only when needed
async function getNextConfigs() {
  try {
    const { FlatCompat } = await import("@eslint/eslintrc");
    const compat = new FlatCompat({ baseDirectory: path.join(__dirname, "apps/portal") });
    return {
      coreWebVitals: compat.extends("next/core-web-vitals"),
      typescript: compat.extends("next/typescript"),
    };
  } catch {
    return { coreWebVitals: [], typescript: [] };
  }
}

const nextConfigs = await getNextConfigs();

export default [
  // Global ignores
  {
    ignores: [
      "**/node_modules/**",
      "**/dist/**",
      "**/.next/**",
      "**/build/**",
      "**/coverage/**",
      "**/next-env.d.ts",
      "**/prisma/**",
    ],
  },

  // Base JS recommendations
  js.configs.recommended,

  // Prettier integration
  {
    plugins: { prettier },
    rules: { "prettier/prettier": "warn" },
  },

  // TypeScript type-checked rules for all TS files
  ...tseslint.configs.recommendedTypeChecked.map((config) => ({
    ...config,
    files: ["**/*.ts", "**/*.tsx"],
    languageOptions: {
      ...(config.languageOptions || {}),
      globals: { ...globals.node },
    },
  })),

  // Backend & domain packages
  {
    files: ["apps/bff/**/*.ts", "packages/domain/**/*.ts"],
    languageOptions: {
      parserOptions: {
        projectService: true,
        tsconfigRootDir: process.cwd(),
      },
    },
    rules: {
      "@typescript-eslint/consistent-type-imports": "error",
      "@typescript-eslint/no-unused-vars": ["warn", { argsIgnorePattern: "^_", varsIgnorePattern: "^_" }],
      "no-console": ["warn", { allow: ["warn", "error"] }],
    },
  },

  // Strict rules for shared packages
  {
    files: ["packages/**/*.ts"],
    rules: {
      "@typescript-eslint/no-redundant-type-constituents": "error",
      "@typescript-eslint/no-explicit-any": "error",
      "@typescript-eslint/no-unsafe-return": "error",
      "@typescript-eslint/no-unsafe-call": "error",
      "@typescript-eslint/no-unsafe-member-access": "error",
    },
  },

  // Next.js app config (only applies to portal files)
  ...nextConfigs.coreWebVitals.map((config) => ({
    ...config,
    files: ["apps/portal/**/*.{js,jsx,ts,tsx}"],
  })),
  ...nextConfigs.typescript.map((config) => ({
    ...config,
    files: ["apps/portal/**/*.{ts,tsx}"],
  })),

  // Portal type-aware rules
  {
    files: ["apps/portal/**/*.{ts,tsx}"],
    languageOptions: {
      parserOptions: {
        projectService: true,
        tsconfigRootDir: process.cwd(),
      },
    },
    rules: {
      "@next/next/no-html-link-for-pages": "off",
    },
  },

  // Prevent hard navigation in authenticated pages
  {
    files: ["apps/portal/src/app/(authenticated)/**/*.{ts,tsx}"],
    rules: {
      "no-restricted-syntax": [
        "error",
        {
          selector: "MemberExpression[object.name='window'][property.name='location']",
          message: "Use next/link or useRouter for navigation.",
        },
      ],
    },
  },

  // Exceptions for specific files
  {
    files: ["apps/portal/src/app/(authenticated)/layout.tsx"],
    rules: { "no-restricted-imports": "off" },
  },
  {
    files: ["apps/portal/src/app/(authenticated)/billing/invoices/[id]/page.tsx"],
    rules: { "no-restricted-syntax": "off" },
  },

  // Enforce domain imports architecture
  {
    files: ["apps/portal/src/**/*.{ts,tsx}", "apps/bff/src/**/*.ts"],
    rules: {
      "no-restricted-imports": [
        "error",
        {
          patterns: [
            {
              group: ["@customer-portal/domain/**/src/**"],
              message: "Import from @customer-portal/domain/<module> instead of internals.",
            },
          ],
        },
      ],
    },
  },

  // BFF strict type safety
  {
    files: ["apps/bff/**/*.ts"],
    rules: {
      "@typescript-eslint/no-explicit-any": "error",
      "@typescript-eslint/no-unsafe-assignment": "error",
      "@typescript-eslint/no-unsafe-member-access": "error",
      "@typescript-eslint/no-unsafe-call": "error",
      "@typescript-eslint/no-unsafe-return": "error",
      "@typescript-eslint/no-unsafe-argument": "error",
      "@typescript-eslint/require-await": "error",
      "@typescript-eslint/no-floating-promises": "error",
    },
  },

  // Node globals for config files
  {
    files: ["*.config.mjs", "apps/portal/next.config.mjs"],
    languageOptions: {
      globals: { ...globals.node },
    },
  },
];