// SPDX-License-Identifier: Apache-2.0
// Copyright © 2022 Roberto Hidalgo <nidito@un.rob.mx>
import * as webauthn from "./webauthn.js"

const host = document.location.protocol + "//" + document.location.host
// const host = "http://localhost:8081"

function localDate(src) {
  const exp = new Date(src)
  return new Date(exp - exp.getTimezoneOffset() * 60000).toISOString().replace("Z", "").replace(/\.\d+$/, '')
}

class UserInfoPanel extends HTMLElement {
  constructor(user) {
    super()
  }

  connectedCallback() {
    let template = document.getElementById("user-info-panel")
    const shadowRoot = this.attachShadow({ mode: "open" })
    const panel = template.content.cloneNode(true)

    let handle = this.getAttribute("handle")
    panel.querySelector('h3').innerHTML = this.getAttribute("name")
    panel.querySelector('input[name=name]').value = this.getAttribute("name")

    const form = panel.querySelector('form')
    form.action = panel.querySelector('form').action.replace(":id", handle)
    panel.querySelector('code').textContent = handle

    panel.querySelector('input[name=greeting]').value = this.getAttribute("greeting")
    if (this.hasAttribute('schedule')){
      panel.querySelector('input[name=schedule]').value = this.getAttribute("schedule")
    }
    if (this.hasAttribute('expires')){
      panel.querySelector('input[name=expires]').value = localDate(this.getAttribute("expires"))
    }
    if (this.hasAttribute("is_admin")) {
      const adminSpan = document.createElement("span")
      adminSpan.innerText = "🔑"
      panel.querySelector(".user-info-meta").prepend(adminSpan)
    }
    panel.querySelector('input[name=max_ttl]').value = this.getAttribute("max_ttl")
    panel.querySelector('input[name=is_admin]').checked = this.hasAttribute("is_admin")
    panel.querySelector('input[name=second_factor]').checked = this.hasAttribute("second_factor")
    panel.querySelector("button.user-edit").addEventListener('click', evt => {
      form.classList.toggle("hidden")
      this.classList.toggle("editing")
    })

    form.addEventListener("submit", async (evt) => {
      evt.preventDefault()
      await UpdateUser(form)
    })

    panel.querySelector("button.user-delete").addEventListener('click', async evt => {
      evt.preventDefault()
      if (confirm(`Seguro que borramos a ${handle}?`)) {
        let response = await webauthn.withAuth(`${host}/api/user/${handle}`, {
          credentials: "include",
          method: "DELETE"
        })

        if (!response.ok) {
          throw new Error("Could not delete user:", response)
        }

        window.location.reload()
      }
    })
    shadowRoot.appendChild(panel)
  }
}
customElements.define("user-info-panel", UserInfoPanel)

class REXRow extends HTMLElement {
  constructor(rex) {
    super()
    let template = document.getElementById("rex-record")
    const shadowRoot = this.attachShadow({ mode: "open" })
    const row = template.content.cloneNode(true)

    row.querySelector('.log-record-timestamp').innerText = localDate(rex.timestamp)
    row.querySelector('.log-record-user').innerText = rex.user
    row.querySelector('.log-record-status').innerHTML = !rex.error ? "ok" : `<strong>${rex.error}</strong> ${rex.failure}`
    row.querySelector('.log-record-second_factor').innerText = rex.second_factor ? "✓" : ""
    row.querySelector('.log-record-ip_address').innerText = rex.ip_address
    row.querySelector('.log-record-user_agent').innerText = rex.user_agent

    shadowRoot.appendChild(row)
  }
}
customElements.define("rex-record", REXRow, {extends: "tr"})

async function fetchUsers() {
  console.debug("fetching users")
  let response = await window.fetch(`${host}/api/user`, {credentials: "include"})

  if (!response.ok) {
    alert("Could not load users")
    return
  }

  let json = {}
  try {
    json = await response.json()
  } catch (err) {
    alert(err)
    return
  }

  document.querySelector("#user-list").replaceChildren(...json.map(u => {
    const ul = new UserInfoPanel()
    Object.keys(u).forEach(k => {
      let val = u[k]
      if (!val) { return }
      if(typeof(val) == "boolean") { val = k; }
      ul.setAttribute(k, u[k])
    })
    return ul
  }))
}

async function fetchLog() {
  console.debug("fetching log")
  let response = await window.fetch(`${host}/api/log?last=20`, {credentials: "include"})

  if (!response.ok) {
    alert("Could not load log")
    return
  }

  let json = {}
  try {
    json = await response.json()
  } catch (err) {
    alert(err)
    return
  }

  document.querySelector("#rex-records").replaceChildren(...json.map(rex => {
    const tr = document.createElement("tr")
    tr.classList.add("rex-staus-" + (!rex.error ? "ok" : "failure"))
    tr.classList.add("rex-record")

    const status = !rex.error ? "ok" : `<strong>${rex.error}</strong> ${rex.failure}`
    tr.innerHTML = `<th class="log-record-timestamp">${localDate(rex.timestamp)}</th>
    <td class="log-record-user">${rex.user}</td>
    <td class="log-record-status">${status}</td>
    <td class="log-record-second_factor">${rex.second_factor ? "✓" : ""}</td>
    <td class="log-record-ip_address">${rex.ip_address}</td>
    <td class="log-record-user_agent">${rex.user_agent}</td>`
    // table rows and shadow dom don't really play along
    // also, the `is` attribute is not supported by safari :/
    // tr.appendChild(new REXRow(record))
    return tr
  }))
}

function userFromForm(form) {
  const user = Object.fromEntries(new FormData(form))
  delete(user.id)
  if (user.expires != "") {
    user.expires = (new Date(user.expires)).toISOString()
  } else {
    delete(user.expires)
  }

  if (user.max_ttl == "") {
    delete(user.max_ttl)
  }

  if (user.schedule == "") {
    delete(user.schedule)
  }

  user.is_admin = user.is_admin == "on"
  user.second_factor = user.second_factor == "on"
  return user
}

async function UpdateUser(form) {
  const user = userFromForm(form)

  let response = await webauthn.withAuth(form.getAttribute("action"), {
    credentials: "include",
    method: "POST",
    body: JSON.stringify(user),
    headers: {
      'Content-Type': 'application/json'
    }
  })

  if (!response.ok) {
    throw new Error("Could not update user:", response)
  }

  window.location.reload()
}

async function CreateUser(form) {
  const user = userFromForm(form)

  let response = await webauthn.withAuth(form.getAttribute("action"), {
    credentials: "include",
    method: "POST",
    body: JSON.stringify(user),
    headers: {
      'Content-Type': 'application/json'
    }
  })

  if (!response.ok) {
    throw new Error("Could not create user:", response)
  }
  form.reset()
  window.location.hash = "#invitades"
}


async function switchTab() {
  let tabName = window.location.hash.toLowerCase().replace("#", "")
  let activate = async () => true
  console.log(`switching to tab ${tabName}`)
  switch (tabName) {
    case "crear":
      break;
    case "registro":
      activate = fetchLog
      break;
    case "":
      tabName = "invitades"
    case "invitades":
      activate = fetchUsers
      break;
    default:
      throw new Error(`unknown tab ${tabName}`)
  }
  console.log(`activating tab ${tabName}`)

  let open = document.querySelector(".tab-open")
  if (open) {
    open.classList.remove("tab-open")
    open.classList.add("hidden")
  }
  let tab = document.querySelector(`#${tabName}`)
  tab.classList.add("tab-open")
  tab.classList.remove("hidden")

  await activate(tab)
}

window.addEventListener("load", async function() {
  const form = document.querySelector("#create-user")
  form.addEventListener("submit", async (evt) => {
    evt.preventDefault()
    await CreateUser(form)
  })

  switchTab()
})

window.addEventListener('hashchange', () => {
  switchTab()
})