function normalizeCode(code) {
  return code
    .trim()
    .replace(/^```go/, '')
    .replace(/^```/, '')
    .replace(/```$/, '')
    .replace(/<([^>]+)>/g, '')
    .trim()
}

function updatePlaygroundView(goplay, id, code) {
  const textarea = document.getElementById(`textarea-${id}`)

  textarea.value = code
  textarea.style.height = textarea.scrollHeight + 'px';
  textarea.style.overflowY = 'hidden';

  textarea.addEventListener('input', function() {
    this.style.height = 'auto';
    this.style.height = this.scrollHeight + 'px';
  })

  const toolRun = document.getElementById(`hugo-goplay-tool-${id}-run`)
  const toolTry = document.getElementById(`hugo-goplay-tool-${id}-try`)
  const toolShare = document.getElementById(`hugo-goplay-tool-${id}-share`)

  toolRun.addEventListener('click', () => {
    const parent = document.getElementById(id)
    const pre = document.createElement('pre')
    const container = document.createElement('code')

    container.classList.add('text')
    pre.appendChild(container)
    parent.replaceChildren(pre)

    goplay.renderCompile(container, textarea.value);
  });

  [toolTry, toolShare].forEach((v) => {
    v.addEventListener('click', async () => {
      const shareUrl = await goplay.share(code)
      window.open(shareUrl, '_blank').focus();
    })
  });
}

function createFieldPlayground(goplay, id, code) {
  code = createFieldPlaygroundCode(code)

  updatePlaygroundView(goplay, id, code)
}

function createPlaygroundWithAutoImportMail(goplay, id, code) {
  let lines = normalizeCode(code).split("\n")
  let results = ["package main", ""]
  let imports = []
  let body = []

  lines.forEach((line) => {
    if (line.substr(0, 7) === '@import') {
      imports.push('    ' + line.replace('@import', '').trim())
    } else {
      body.push("    " + line)
    }
  })

  if (imports.length > 0) {
    results.push("import (")

    imports.forEach((v) => {
      results.push(v)
    })

    results.push(")", "")
  }

  results.push("func main() {")

  body.forEach((v, i) => {
    if (i == 0 && v.trim() == "") {
      return
    }

    results.push(v)
  })

  results.push("}", "")

  updatePlaygroundView(goplay, id, results.join("\n"))
}

function createFieldPlaygroundCode(code) {
  code = normalizeCode(code)
  let lines = code.split("\n");

  for (let i in lines) {
  lines[i] = ['    ', lines[i]].join('')
  }

  code = lines.join("\n");

  return `package main

import (
    "fmt"
    "html/template"
    "strings"

    "gitnet.fr/deblan/go-form/form"
    "gitnet.fr/deblan/go-form/theme"
)

func main() {
${code}

    r(form.NewForm(field))
}

func r(f *form.Form) {
    render := theme.NewRenderer(theme.Html5)
    tpl, _ := template.New("example").Funcs(render.FuncMap()).Parse(\`{{ form_widget (.Form.GetField "Foo") }}\`)
    b := new(strings.Builder)
    tpl.Execute(b, map[string]any{"Form": f})
    fmt.Println(b.String())
}`
}