import commonjs from '@rollup/plugin-commonjs';
import json from '@rollup/plugin-json';
import resolve from '@rollup/plugin-node-resolve';
import babel from 'rollup-plugin-babel';
import replace from 'rollup-plugin-replace';
import svelte from 'rollup-plugin-svelte';
import { terser } from 'rollup-plugin-terser';
import config from 'sapper/config/rollup.js';

import pkg from './package.json';

const mode = process.env.NODE_ENV;
const dev = mode === 'development';
const legacy = !!process.env.SAPPER_LEGACY_BUILD;

const onwarn = (warning, onwarn) => {
    if (
        (warning.code === 'CIRCULAR_DEPENDENCY' &&
            /[/\\]@sapper[/\\]/.test(warning.message))
    ) {
        return;
    }

    if (warning.code === 'THIS_IS_UNDEFINED') {
        return;
    }

    onwarn(warning);
};

export default {
    client: {
        input: config.client.input(),
        output: config.client.output(),
        plugins: [
            replace({
                'process.browser': true,
                'process.env.NODE_ENV': JSON.stringify(mode)
            }),
            svelte({
                dev,
                hydratable: true,
                emitCss: true
            }),
            resolve(),
            commonjs(),

            legacy && babel({
                extensions: ['.js', '.mjs', '.html', '.svelte'],
                runtimeHelpers: true,
                exclude: ['node_modules/@babel/**'],
                presets: [
                    ['@babel/preset-env', {
                        targets: '> 0.25%, not dead'
                    }]
                ],
                plugins: [
                    '@babel/plugin-syntax-dynamic-import',
                    ['@babel/plugin-transform-runtime', {
                        useESModules: true
                    }]
                ]
            }),

            !dev && terser({
                module: true
            }),

            json()
        ],
        onwarn,
    },

    server: {
        input: config.server.input(),
        output: config.server.output(),
        plugins: [
            replace({
                'process.browser': false,
                'process.env.NODE_ENV': JSON.stringify(mode)
            }),
            svelte({
                generate: 'ssr',
                dev
            }),
            resolve(),
            commonjs(),
            json()
        ],
        external: Object.keys(pkg.dependencies).concat(
            require('module').builtinModules || Object.keys(process.binding('natives'))
        ),
        onwarn,
    },

    serviceworker: {
        input: config.serviceworker.input(),
        output: config.serviceworker.output(),
        plugins: [
            resolve(),
            replace({
                'process.browser': true,
                'process.env.NODE_ENV': JSON.stringify(mode)
            }),
            commonjs(),
            !dev && terser()
        ],
        onwarn,
    },
};