// vite.config.ts
import { createMpaPlugin, createPages } from 'vite-plugin-virtual-mpa'

// @see https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    createMpaPlugin({
      pages: [
        /** 
         * You can write pages configuration here directly. 
         * Or use `createPages` function independently outside and then pass result to this field.
         */
      ]
    }),
  ],
})

/**
 * This function simply converts the arguments to an array and returns them.
 * It helps creating pages configuration with type hints independently outside plugin function.
 * It may also simplify your configurations because you can manage them uniformly somewhere.
 */
const pages = createPages([
  // You can pass a single page object or a pages array.
])

// @see https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    createMpaPlugin({
      pages,
    }),
  ],
})

type FilterPattern = string | RegExp | (string | RegExp)[]
type RewriteRule = false | Rewrite[]
interface WatchHandler {
  (ctx: {
    server: ViteDevServer,
    file: string,
    type: Event
    /**
     * You can update the pages configuration by calling this function.
     * @params pages Your MPA core configurations, which will replace default `pages` config
     */
    reloadPages: (pages: Page[]) => void
  }): void
}

interface MpaOptions {
  /**
   * whether to print log
   * @default true
   */
  verbose?: boolean,
  /**
   * default template file
   * @default index.html
   */
  template?: `${string}.${'ejs' | 'html'}`,
  /**
   * Configure your rewrite rules, only proceed html requests.
   * @see https://github.com/bripkens/connect-history-api-fallback
   */
  rewrites?: RewriteRule,
  /**
   * Configure your preview server's rewrite rules.
   * @see https://github.com/bripkens/connect-history-api-fallback
   */
  previewRewrites?: RewriteRule,
  /**
   * Dedicated hook for transforming template HTML, inherit from `transformIndexHtml`.
   * @see https://vitejs.dev/guide/api-plugin#transformindexhtml
   */
  transformHtml?: (
    html: string,
    ctx: IndexHtmlTransformContext & { page: Page },
  ) => IndexHtmlTransformResult;
  /**
   * Use to scan directories that have similar structure to generate pages.
   * Detected pages will be appended to `pages` option, page with name existed will be ignored.
   */
  scanOptions?: {
    /**
     * Directory path to scan, subdirectory's name will be used as unique page name.
     */
    scanDirs: string | string[];
    /**
     * The entry file path relative to scanned dir.
     */
    entryFile?: string;
    /**
     * Customize the virtual file name(output filename).
     * @param name Subdirectory name
     */
    filename?: (name: string) => string;
  };
  /**
   * Sometimes you might want to reload `pages` config or restart ViteDevServer when
   * there are some files added, removed, changed and so on. You can set `watchOptions` to
   * customize your own logic.
   */
  watchOptions?: WatchHandler | {
    /**
     * Specifies the files to **include**, based on `Rollup.createFilter`
     * @see https://vitejs.dev/guide/api-plugin.html#filtering-include-exclude-pattern
     */
    include?: Exclude<FilterPattern, null>,
    /**
     * Specifies the files to **exclude**, based on `Rollup.createFilter`
     * @see https://vitejs.dev/guide/api-plugin.html#filtering-include-exclude-pattern
     */
    excluded?: Exclude<FilterPattern, null>,
    /**
     * File events you wanna deal with.
     * @default ['add', 'unlink', 'change', 'unlinkDir', 'addDir']
     */
    events?: Event[],
    /**
     * Execute your own logic when file events fired.
     */
    handler: WatchHandler
  },
  /**
   * your MPA core configurations
   */
  pages: Array<{
    /**
     * Required. Name is used to generate default rewrite rules, it just a common string and please don't include '/'.
     * You can use filename option not name option if you want to customize the path of generated files.
     */
    name: string;
    /**
     * Relative path to the output directory, which should end with .html
     * @default `${name}.html`
     */
    filename?: `${string}.html`;
    /**
     * Higher priority template file, which will overwrite the default template.
     */
    template?: string;
    /**
     * Entry file that will append to body. which you should remove from the html template file.
     */
    entry?: string;
    /**
     * Data to inject with ejs.
     */
    data?: Record<string, any>,
  }>,
  /**
   * Whether to minify html file. Powered by html-minify-terser.
   * @default false
   * @see https://github.com/terser/html-minifier-terser
   */
  htmlMinify?: Options | boolean,
}

// vite.config.ts
import { normalizePath } from "vite";
import { createMpaPlugin } from "vite-plugin-virtual-mpa"

const base = "/sites/"

// @see https://vitejs.dev/config/
export default defineConfig({
  base,
  plugins: [
    createMpaPlugin({
      htmlMinify: false,
      pages: [
        {
          name: "apple",
          /**
           * filename is optional, default is `${name}.html`, which is the relative path of `build.outDir`.
           */
          filename: "fruits/apple.html", // output into sites/fruits/apple.html at build time.
          entry: "/src/fruits/apple/index.js",
          data: {
            title: "This is Apple page"
          }
        },
        {
          name: "banana",
          filename: "fruits/banana.html",
          entry: "/src/fruits/banana/index.js",
          data: {
            title: "This is Banana page"
          }
        },
        {
          name: "strawberries",
          filename: "fruits/strawberries.html",
          entry: "/src/fruits/strawberries/index.js",
          data: {
            title: "This is Strawberries page"
          }
        }
      ],
      /**
       * The following `scanOptions` configs can replace the `pages` above, but except data injection.
       */
      scanOptions: {
        scanDirs: 'src/fruits',
        entryFile: 'index.js',
        filename: name => `fruits/${name}.html`,
        template: '../../template.html',
      }
      /**
       * Customize the history fallback rewrite rules.
       * If you config your pages as above, this rewrite rules will be automatically generated.
       * Otherwise you should manually write it, which will overwrite the default.
       */
      rewrites: [
        {
          from: new RegExp(normalizePath(`/${base}/(apple|banana|strawberries)`)),
          to: (ctx) => normalizePath(`/fruits/${ctx.match[1]}.html`),
        }
      ],
      /**
       * Configure your preview server's rewrite rules.
       * This option is almost the same with `rewrites`.
       */
      previewRewrites: [
        // If there's no index.html, you need to manually set rules for history fallback like:
        { from: /.*/, to: '/home.html' },
      ],
      /** Customize HTML */
      transformHtml(html, ctx) {
        return {
          html,
          tags: [
            {
              tag: 'div',
              injectTo: 'body-prepend',
              children: `[Auto Injected] Page name: ${ctx.page.name}`,
            },
          ],
        };
      },
    }),
  ],
})

{
  from: new RegExp(normalizePath(`/${base}/(${Object.keys(inputMap).join('|')})`)),
  to: ctx => normalizePath(`/${base}/${inputMap[ctx.match[1]]}`),
}

{
  apple: 'fruits/apple.html',
  banana: 'fruits/banana.html',
  strawberries: 'fruits/strawberries.html',
}