import "source-map-support/register.js"
import path from "path"
import { PerfTimer } from "./perf"
import { rimraf } from "rimraf"
import { globby, isGitIgnored } from "globby"
import chalk from "chalk"
import http from "http"
import serveHandler from "serve-handler"
import { parseMarkdown } from "./processors/parse"
import { filterContent } from "./processors/filter"
import { emitContent } from "./processors/emit"
import cfg from "../quartz.config"
import { FilePath } from "./path"
import chokidar from "chokidar"
import { ProcessedContent } from "./plugins/vfile"
import WebSocket, { WebSocketServer } from "ws"

interface Argv {
  directory: string
  verbose: boolean
  output: string
  serve: boolean
  port: number
}

async function buildQuartz(argv: Argv, version: string) {
  console.log(chalk.bgGreen.black(`\n Quartz v${version} \n`))
  const perf = new PerfTimer()
  const output = argv.output

  const pluginCount = Object.values(cfg.plugins).flat().length
  const pluginNames = (key: "transformers" | "filters" | "emitters") =>
    cfg.plugins[key].map((plugin) => plugin.name)
  if (argv.verbose) {
    console.log(`Loaded ${pluginCount} plugins`)
    console.log(`  Transformers: ${pluginNames("transformers").join(", ")}`)
    console.log(`  Filters: ${pluginNames("filters").join(", ")}`)
    console.log(`  Emitters: ${pluginNames("emitters").join(", ")}`)
  }

  // clean
  perf.addEvent("clean")
  await rimraf(output)
  console.log(`Cleaned output directory \`${output}\` in ${perf.timeSince("clean")}`)

  // glob
  perf.addEvent("glob")
  const fps = await globby("**/*.md", {
    cwd: argv.directory,
    ignore: cfg.configuration.ignorePatterns,
    gitignore: true,
  })
  console.log(
    `Found ${fps.length} input files from \`${argv.directory}\` in ${perf.timeSince("glob")}`,
  )

  const filePaths = fps.map((fp) => `${argv.directory}${path.sep}${fp}` as FilePath)
  const parsedFiles = await parseMarkdown(
    cfg.plugins.transformers,
    argv.directory,
    filePaths,
    argv.verbose,
  )
  const filteredContent = filterContent(cfg.plugins.filters, parsedFiles, argv.verbose)
  await emitContent(argv.directory, output, cfg, filteredContent, argv.serve, argv.verbose)
  console.log(chalk.green(`Done processing ${fps.length} files in ${perf.timeSince()}`))

  if (argv.serve) {
    const wss = new WebSocketServer({ port: 3001 })
    const connections: WebSocket[] = []
    wss.on("connection", (ws) => connections.push(ws))

    const ignored = await isGitIgnored()
    const contentMap = new Map<FilePath, ProcessedContent>()
    for (const content of parsedFiles) {
      const [_tree, vfile] = content
      contentMap.set(vfile.data.filePath!, content)
    }

    async function rebuild(fp: string, action: "add" | "change" | "unlink") {
      perf.addEvent("rebuild")
      if (!ignored(fp)) {
        console.log(chalk.yellow(`Detected change in ${fp}, rebuilding...`))
        const fullPath = `${argv.directory}${path.sep}${fp}` as FilePath

        try {
          if (action === "add" || action === "change") {
            const [parsedContent] = await parseMarkdown(
              cfg.plugins.transformers,
              argv.directory,
              [fullPath],
              argv.verbose,
            )
            contentMap.set(fullPath, parsedContent)
          } else if (action === "unlink") {
            contentMap.delete(fullPath)
          }

          await rimraf(output)
          const parsedFiles = [...contentMap.values()]
          const filteredContent = filterContent(cfg.plugins.filters, parsedFiles, argv.verbose)
          await emitContent(argv.directory, output, cfg, filteredContent, argv.serve, argv.verbose)
          console.log(chalk.green(`Done rebuilding in ${perf.timeSince("rebuild")}`))
        } catch {
          console.log(chalk.yellow(`Rebuild failed. Waiting on a change to fix the error...`))
        }

        connections.forEach((conn) => conn.send("rebuild"))
      }
    }

    const watcher = chokidar.watch(".", {
      persistent: true,
      cwd: argv.directory,
      ignoreInitial: true,
    })

    watcher
      .on("add", (fp) => rebuild(fp, "add"))
      .on("change", (fp) => rebuild(fp, "change"))
      .on("unlink", (fp) => rebuild(fp, "unlink"))

    const server = http.createServer(async (req, res) => {
      await serveHandler(req, res, {
        public: output,
        directoryListing: false,
      })
      const status = res.statusCode
      const statusString =
        status >= 200 && status < 300
          ? chalk.green(`[${status}]`)
          : status >= 300 && status < 400
          ? chalk.yellow(`[${status}]`)
          : chalk.red(`[${status}]`)
      console.log(statusString + chalk.grey(` ${req.url}`))
    })
    server.listen(argv.port)
    console.log(chalk.cyan(`Started a Quartz server listening at http://localhost:${argv.port}`))
    console.log("hint: exit with ctrl+c")
  }
}

export default async (argv: Argv, version: string) => {
  try {
    await buildQuartz(argv, version)
  } catch {
    console.log(chalk.red("\nExiting Quartz due to a fatal error"))
    process.exit(1)
  }
}