'use strict'

import { nodeResolve as resolve } from '@rollup/plugin-node-resolve'
import replace from '@rollup/plugin-replace'
import { terser } from 'rollup-plugin-terser'
import typescriptPlugin from '@rollup/plugin-typescript'
import commonjs from '@rollup/plugin-commonjs'
import json from '@rollup/plugin-json'

import { join } from 'path'
import { existsSync } from 'fs-extra'
import { directories, name as _name, dependencies, peerDependencies, exports } from '../package.json'
import { compile } from './rollup-plugin-dts.js'

const rootDir = join(__dirname, '..')
const dstDir = join(rootDir, directories.dist)
const srcDir = join(rootDir, 'src', 'ts')

function camelise (str) {
  return str.replace(/-([a-z])/g,
    function (m, w) {
      return w.toUpperCase()
    })
}

const regex = /^(?:(?<scope>@.*?)\/)?(?<name>.*)/ // We are going to take only the package name part if there is a scope, e.g. @my-org/package-name
const { name } = _name.match(regex).groups
const pkgCamelisedName = camelise(name)

const input = join(srcDir, 'index.ts')
if (existsSync(input) !== true) throw new Error('The entry point should be index.ts')

const tsBundleOptions = {
  tsconfig: join(rootDir, 'tsconfig.json'),
  outDir: undefined, // ignore outDir in tsconfig.json
  include: ['src/ts/**/*', 'build/typings/is-browser.d.ts'],
  exclude: ['src/**/*.spec.ts']
}

const external = [...Object.keys(dependencies || {}), ...Object.keys(peerDependencies || {})]

const sourcemapOutputOptions = {
  sourcemap: 'inline',
  sourcemapExcludeSources: true
}

function compileDts () {
  return {
    name: 'compile-dts',
    closeBundle () {
      compile()
    }
  }
}

export default [
  { // ESM for browsers and declarations
    input: input,
    output: [
      {
        file: join(rootDir, exports['.'].default),
        ...sourcemapOutputOptions,
        format: 'es'
      }
    ],
    plugins: [
      replace({
        IS_BROWSER: true,
        preventAssignment: true
      }),
      typescriptPlugin(tsBundleOptions),
      compileDts(),
      json()
    ],
    external
  },
  { // Browser bundles
    input: input,
    output: [
      {
        file: join(dstDir, 'bundles/iife.js'),
        format: 'iife',
        name: pkgCamelisedName,
        plugins: [terser()]
      },
      {
        file: join(dstDir, 'bundles/esm.js'),
        ...sourcemapOutputOptions,
        format: 'es'
      },
      {
        file: join(dstDir, 'bundles/esm.min.js'),
        format: 'es',
        plugins: [terser()]
      },
      {
        file: join(dstDir, 'bundles/umd.js'),
        format: 'umd',
        name: pkgCamelisedName,
        plugins: [terser()]
      }
    ],
    plugins: [
      replace({
        IS_BROWSER: true,
        preventAssignment: true
      }),
      typescriptPlugin(tsBundleOptions),
      resolve({
        browser: true,
        exportConditions: ['browser', 'module', 'import', 'default'],
        mainFields: ['browser', 'module', 'main']
      }),
      commonjs({
        namedExports: {
          'bn.js': ['BN'],
          'hash.js': ['hmac', 'ripemd160', 'sha256', 'sha512'],
          elliptic: ['ec'],
          'scrypt-js': ['scrypt', 'syncScrypt']
        }
      }),
      json()
    ]
  },
  { // Node
    input: input,
    output: [
      {
        file: join(rootDir, exports['.'].node.require),
        ...sourcemapOutputOptions,
        format: 'cjs',
        exports: 'auto'
      },
      {
        file: join(rootDir, exports['.'].node.import),
        ...sourcemapOutputOptions,
        format: 'es'
      }
    ],
    plugins: [
      replace({
        IS_BROWSER: false,
        preventAssignment: true
      }),
      typescriptPlugin(tsBundleOptions),
      commonjs({ extensions: ['.js', '.cjs', '.ts', '.jsx', '.cjsx', '.tsx'] }), // the ".ts" extension is required
      json()
    ],
    external
  }
]