import fs from 'fs'
import path from 'path'
import slash from 'slash'
import { parse } from 'jsonc-parser'
import { Plugin } from 'vite'
import { camelize, capitalize } from '@vue/shared'
import { parseJson } from '@dcloudio/uni-cli-shared'
import { VitePluginUniResolvedOptions } from '../..'

const pkg = require('@dcloudio/vite-plugin-uni/package.json')

const PAGES_JSON_JS = 'pages.json.js'

export function uniPagesJsonPlugin(
  options: VitePluginUniResolvedOptions
): Plugin {
  const pagesJsonPath = slash(path.join(options.inputDir, 'pages.json'))
  return {
    name: 'vite:uni-pages-json',
    resolveId(id) {
      if (id.endsWith(PAGES_JSON_JS)) {
        return pagesJsonPath + '.js'
      }
    },
    transform(code, id) {
      if (id.endsWith(PAGES_JSON_JS)) {
        return {
          code:
            (options.devServer ? registerGlobalCode : '') +
            parsePagesJson(code, options),
          map: { mappings: '' },
        }
      }
    },
    load(id) {
      if (id.endsWith(PAGES_JSON_JS)) {
        return JSON.stringify(parse(fs.readFileSync(pagesJsonPath, 'utf8')))
      }
    },
  }
}

interface PageRouteOptions {
  name: string
  path: string
  props: Record<string, any>
  meta: {
    isQuit: boolean | undefined
    isEntry: boolean | undefined
    isTabBar: boolean | undefined
    tabBarIndex: number
    windowTop: number
    topWindow: boolean | undefined
    leftWindow: boolean | undefined
    rightWindow: boolean | undefined
  }
}

function parsePagesJson(
  jsonStr: string,
  options: VitePluginUniResolvedOptions
) {
  const pagesJson = formatPagesJson(jsonStr)
  const definePagesCode = generatePagesDefineCode(pagesJson)
  const uniRoutesCode = generateRoutes(pagesJson)
  const uniConfigCode = generateConfig(pagesJson, options)
  const manifestJsonPath = slash(
    path.resolve(options.inputDir, 'manifest.json.js')
  )

  return `
import { defineAsyncComponent, resolveComponent, createVNode, withCtx, openBlock, createBlock } from 'vue'
import { PageComponent, AsyncLoadingComponent, AsyncErrorComponent } from '@dcloudio/uni-h5'
import { appid, debug, networkTimeout, router, async, sdkConfigs, qqMapKey, nvue } from '${manifestJsonPath}'
${uniConfigCode}
${definePagesCode}
${uniRoutesCode}
`
}

const registerGlobalCode = `import {uni,getCurrentPages,getApp,UniServiceJSBridge,UniViewJSBridge} from '@dcloudio/uni-h5'
window.getApp = getApp
window.getCurrentPages = getCurrentPages
window.uni = window.__GLOBAL__ = uni
window.UniViewJSBridge = UniViewJSBridge
window.UniServiceJSBridge = UniServiceJSBridge
`

function formatPages(pagesJson: Record<string, any>, jsonStr: string) {
  if (!Array.isArray(pagesJson.pages)) {
    pagesJson.pages = []
    console.error(`[vite] Error: pages.json->pages parse failed.\n`, jsonStr)
  } else if (!pagesJson.pages.length) {
    console.error(
      `[vite] Error: pages.json->pages must contain at least 1 page.\n`,
      jsonStr
    )
  }
}

function removePlatformStyle(globalStyle: Record<string, any>) {
  delete globalStyle['app-plus']
  delete globalStyle['h5']
  Object.keys(globalStyle).forEach((name) => {
    if (name.startsWith('mp-') || name.startsWith('quickapp')) {
      delete globalStyle[name]
    }
  })
  return globalStyle
}

function formatPageStyle(pageStyle?: Record<string, any>) {
  if (pageStyle) {
    const appGlobalStyle = pageStyle['app-plus']
    if (appGlobalStyle) {
      Object.assign(pageStyle, appGlobalStyle)
    }
    const h5GlobalStyle = pageStyle['h5']
    if (h5GlobalStyle) {
      Object.assign(pageStyle, h5GlobalStyle)
    }
    return removePlatformStyle(pageStyle)
  }
}

function formatSubpackages(subpackages?: UniApp.PagesJsonSubpackagesOptions[]) {
  const pages: UniApp.PagesJsonPageOptions[] = []
  if (Array.isArray(subpackages)) {
    subpackages.forEach(({ root, pages: subPages }) => {
      if (root && subPages.length) {
        subPages.forEach((subPage: { path: string }) => {
          subPage.path = slash(path.join(root, subPage.path))
          pages.push(subPage)
        })
      }
    })
  }
  return pages
}

function formatPagesJson(jsonStr: string) {
  let pagesJson: UniApp.PagesJson = {
    pages: [],
  }
  // preprocess
  try {
    pagesJson = parseJson(jsonStr, true)
  } catch (e) {
    console.error(`[vite] Error: pages.json parse failed.\n`, jsonStr, e)
  }
  // pages
  formatPages(pagesJson, jsonStr)
  // subpackages
  pagesJson.pages.push(
    ...formatSubpackages(pagesJson.subPackages || pagesJson.subpackages)
  )
  // globalStyle
  formatPageStyle(pagesJson.globalStyle)
  return pagesJson
}

function formatPageIdentifier(path: string) {
  return capitalize(camelize(path.replace(/\//g, '-')))
}

function generatePageDefineCode(pageOptions: UniApp.PagesJsonPageOptions) {
  return `const ${formatPageIdentifier(
    pageOptions.path
  )} = defineAsyncComponent({
 loader: () => import('./${pageOptions.path}.vue?mpType=page'),
 loadingComponent: AsyncLoadingComponent,
 errorComponent: AsyncErrorComponent,
 delay: async.delay,
 timeout: async.timeout,
 suspensible: async.suspensible
})`
}

function generatePagesDefineCode(pagesJson: UniApp.PagesJson) {
  return pagesJson.pages
    .map((pageOptions) => generatePageDefineCode(pageOptions))
    .join('\n')
}

function formatPagesRoute(pagesJson: UniApp.PagesJson): PageRouteOptions[] {
  const firstPagePath = pagesJson.pages[0].path
  const tabBarList = (pagesJson.tabBar && pagesJson.tabBar.list) || []
  return pagesJson.pages.map((pageOptions) => {
    const path = pageOptions.path
    const name = formatPageIdentifier(path)
    const isEntry = firstPagePath === path ? true : undefined
    const tabBarIndex = tabBarList.findIndex(
      (tabBarPage: { pagePath: string }) => tabBarPage.pagePath === path
    )
    const isTabBar = tabBarIndex !== -1 ? true : undefined
    const props = formatPageStyle(pageOptions.style) || {}

    let windowTop = 0
    const meta = {
      isQuit: isEntry || isTabBar ? true : undefined,
      isEntry,
      isTabBar,
      tabBarIndex,
      windowTop,
      topWindow: props.topWindow,
      leftWindow: props.leftWindow,
      rightWindow: props.rightWindow,
    }
    Object.assign(props, meta)
    return {
      name,
      path: pageOptions.path,
      props,
      meta,
    }
  })
}

function generatePageRoute({ name, path, props, meta }: PageRouteOptions) {
  return `{
  path:'/${meta.isEntry ? '' : path}',
  component:{
    render() {
      return (openBlock(), createBlock(PageComponent, Object.assign({}, __uniConfig.globalStyle, ${JSON.stringify(
        props
      )}), {page: withCtx(() => [createVNode(${name})]), _: 1}, 16))
    }
  },
  meta: ${JSON.stringify(meta)}
}`
}

function generatePagesRoute(pagesRouteOptions: PageRouteOptions[]) {
  return pagesRouteOptions.map((pageOptions) => generatePageRoute(pageOptions))
}

function generateRoutes(pagesJson: UniApp.PagesJson) {
  return `window.__uniRoutes=[${[
    `{ path: '/${pagesJson.pages[0].path}', redirect: '/' }`,
    ...generatePagesRoute(formatPagesRoute(pagesJson)),
  ].join(',')}]`
}

function generateConfig(
  pagesJson: Record<string, any>,
  options: VitePluginUniResolvedOptions
) {
  delete pagesJson.pages
  delete pagesJson.subPackages
  delete pagesJson.subpackages
  pagesJson.compilerVersion = pkg['uni-app'].compilerVersion
  return (
    (options.devServer
      ? ''
      : `window['____'+appid+'____']=true
delete window['____'+appid+'____']
`) +
    `window.__uniConfig=Object.assign(${JSON.stringify(pagesJson)},{
  async,
  debug,
  networkTimeout,
  sdkConfigs,
  qqMapKey,
  nvue,
  router
})
`
  )
}