// Copyright (C) 2018-2021 by BDE ENS Paris-Saclay
// SPDX-License-Identifier: GPL-3.0-or-later

/**
 * Convert balance in cents to a human readable amount
 * @param value the balance, in cents
 * @returns {string}
 */
function pretty_money (value) {
  if (value % 100 === 0) { return (value < 0 ? '- ' : '') + Math.floor(Math.abs(value) / 100) + ' €' } else {
    return (value < 0 ? '- ' : '') + Math.floor(Math.abs(value) / 100) + '.' +
            (Math.abs(value) % 100 < 10 ? '0' : '') + (Math.abs(value) % 100) + ' €'
  }
}

/**
 * Add a message on the top of the page.
 * @param msg The message to display
 * @param alert_type The type of the alert. Choices: info, success, warning, danger
 * @param timeout The delay (in millis) after that the message is auto-closed. If negative, then it is ignored.
 */
function addMsg (msg, alert_type, timeout = -1) {
  const msgDiv = $('#messages')
  let html = msgDiv.html()
  const id = Math.floor(10000 * Math.random() + 1)
  html += '<div class="alert alert-' + alert_type + ' alert-dismissible">' +
        '<button id="close-message-' + id + '" class="close" data-dismiss="alert" href="#"><span aria-hidden="true">×</span></button>' +
        msg + '</div>\n'
  msgDiv.html(html)

  if (timeout > 0) {
    setTimeout(function () {
      $('#close-message-' + id).click()
    }, timeout)
  }
}

/**
 * add Muliple error message from err_obj
 * @param errs_obj [{error_code:erro_message}]
 * @param timeout The delay (in millis) after that the message is auto-closed. If negative, then it is ignored.
 */
function errMsg (errs_obj, timeout = -1) {
  for (const err_msg of Object.values(errs_obj)) {
    addMsg(err_msg, 'danger', timeout)
  }
}

var reloadWithTurbolinks = (function () {
  var scrollPosition

  function reload () {
    scrollPosition = [window.scrollX, window.scrollY]
    Turbolinks.visit(window.location.toString(), { action: 'replace' })
  }

  document.addEventListener('turbolinks:load', function () {
    if (scrollPosition) {
      window.scrollTo.apply(window, scrollPosition)
      scrollPosition = null
    }
  })

  return reload
})()

/**
 * Reload the balance of the user on the right top corner
 */
function refreshBalance () {
  $('#user_balance').load('/ #user_balance')
}

/**
 * Query the 20 first matched notes with a given pattern
 * @param pattern The pattern that is queried
 * @param fun For each found note with the matched alias `alias`, fun(note, alias) is called.
 */
function getMatchedNotes (pattern, fun) {
  $.getJSON('/api/note/alias/?format=json&alias=' + pattern + '&search=user|club', fun)
}

/**
 * Generate a <li> entry with a given id and text
 */
function li (id, text, extra_css) {
  return '<li class="list-group-item py-1 px-2 d-flex justify-content-between align-items-center text-truncate ' +
        (extra_css || '') + '"' + ' id="' + id + '">' + text + '</li>\n'
}

/**
 * Return style to apply according to the balance of the note and the validation status of the email address
 * @param note The concerned note.
 */
function displayStyle (note) {
  if (!note) { return '' }
  const balance = note.balance
  var css = ''
  var ms_per_year = 31536000000 // 365 * 24 * 3600 * 1000
  if (balance < -2000) { css += ' text-danger bg-dark' } 
  else if (balance < -1000) { css += ' text-danger' } 
  else if (balance < 0) { css += ' text-warning' }
  if (!note.email_confirmed) { css += ' bg-primary' }
  else if (!note.is_active || (note.membership && note.membership.date_end < new Date().toISOString())) { css += ' bg-info' }
  if (((Date.now() - Date.parse(note.created_at))/ms_per_year) > 2.5) { css += ' font-weight-bold underline' }
  return css
}

/**
 * Render note name and picture
 * @param note The note to render
 * @param alias The alias to be displayed
 * @param user_note_field
 * @param profile_pic_field
 */
function displayNote (note, alias, user_note_field = null, profile_pic_field = null) {
  if (!note.display_image) {
    note.display_image = '/static/member/img/default_picture.png'
  }
  const img = note.display_image
  if (alias !== note.name && note.name) { alias += ' (aka. ' + note.name + ')' }
  if (user_note_field !== null) {
    $('#' + user_note_field).removeAttr('class')
    $('#' + user_note_field).addClass(displayStyle(note))
    $('#' + user_note_field).text(alias + (note.balance == null ? '' : (' :\n' + pretty_money(note.balance))))
    if (profile_pic_field != null) {
      $('#' + profile_pic_field).attr('src', img)
      $('#' + profile_pic_field + '_link').attr('href', note.resourcetype === 'NoteUser'
        ? '/accounts/user/' + note.user : note.resourcetype === 'NoteClub'
          ? '/accounts/club/' + note.club : '#')
    }
  }
}

/**
 * Remove a note from the emitters.
 * @param d The note to remove
 * @param note_prefix The prefix of the identifiers of the <li> blocks of the emitters
 * @param notes_display An array containing the infos of the buyers: [alias, note id, note object, quantity]
 * @param note_list_id The div block identifier where the notes of the buyers are displayed
 * @param user_note_field The identifier of the field that display the note of the hovered note (useful in
 *                        consumptions, put null if not used)
 * @param profile_pic_field The identifier of the field that display the profile picture of the hovered note
 *                          (useful in consumptions, put null if not used)
 * @returns an anonymous function to be compatible with jQuery events
 */
function removeNote (d, note_prefix = 'note', notes_display, note_list_id, user_note_field = null, profile_pic_field = null) {
  return function () {
    const new_notes_display = []
    let html = ''
    notes_display.forEach(function (disp) {
      if (disp.quantity > 1 || disp.id !== d.id) {
        disp.quantity -= disp.id === d.id ? 1 : 0
        new_notes_display.push(disp)
        html += li(note_prefix + '_' + disp.id, disp.name +
                    '<span class="badge badge-dark badge-pill">' + disp.quantity + '</span>',
        displayStyle(disp.note))
      }
    })

    notes_display.length = 0
    new_notes_display.forEach(function (disp) {
      notes_display.push(disp)
    })

    $('#' + note_list_id).html(html)
    notes_display.forEach(function (disp) {
      const obj = $('#' + note_prefix + '_' + disp.id)
      obj.click(removeNote(disp, note_prefix, notes_display, note_list_id, user_note_field, profile_pic_field))
      obj.hover(function () {
        if (disp.note) { displayNote(disp.note, disp.name, user_note_field, profile_pic_field) }
      })
    })
  }
}

/**
 * Generate an auto-complete field to query a note with its alias
 * @param field_id The identifier of the text field where the alias is typed
 * @param note_list_id The div block identifier where the notes of the buyers are displayed
 * @param notes An array containing the note objects of the buyers
 * @param notes_display An array containing the infos of the buyers: [alias, note id, note object, quantity]
 * @param alias_prefix The prefix of the <li> blocks for the matched aliases
 * @param note_prefix The prefix of the <li> blocks for the notes of the buyers
 * @param user_note_field The identifier of the field that display the note of the hovered note (useful in
 *                        consumptions, put null if not used)
 * @param profile_pic_field The identifier of the field that display the profile picture of the hovered note
 *                          (useful in consumptions, put null if not used)
 * @param alias_click Function that is called when an alias is clicked. If this method exists and doesn't return true,
 *                    the associated note is not displayed.
 *                    Useful for a consumption if the item is selected before.
 */
function autoCompleteNote (field_id, note_list_id, notes, notes_display, alias_prefix = 'alias',
  note_prefix = 'note', user_note_field = null, profile_pic_field = null, alias_click = null) {
  const field = $('#' + field_id)

  // Configure tooltip
  field.tooltip({
    html: true,
    placement: 'bottom',
    title: 'Loading...',
    trigger: 'manual',
    container: field.parent(),
    fallbackPlacement: 'clockwise'
  })

  // When the user clicks elsewhere, we hide the tooltip
  $(document).click(function (e) {
    if (!e.target.id.startsWith(alias_prefix)) {
      field.tooltip('hide')
    }
  })

  let old_pattern = null

  // Clear search on click
  field.click(function () {
    field.tooltip('hide')
    field.removeClass('is-invalid')
    field.val('')
    old_pattern = ''
  })

  // When the user type "Enter", the first alias is clicked
  field.keypress(function (event) {
    if (event.originalEvent.charCode === 13 && notes.length > 0) {
      const li_obj = field.parent().find('ul li').first()
      displayNote(notes[0], li_obj.text(), user_note_field, profile_pic_field)
      li_obj.trigger('click')
    }
  })

  // When the user type something, the matched aliases are refreshed
  field.keyup(function (e) {
    field.removeClass('is-invalid')

    if (e.originalEvent.charCode === 13) { return }

    const pattern = field.val()

    // If the pattern is not modified, we don't query the API
    if (pattern === old_pattern) { return }
    old_pattern = pattern
    notes.length = 0

    // get matched Alias with note associated
    if (pattern === '') {
      field.tooltip('hide')
      notes.length = 0
      return
    }

    $.getJSON('/api/note/consumer/?format=json&alias=' + pattern + '&search=user|club',
      function (consumers) {
        // The response arrived too late, we stop the request
        if (pattern !== $('#' + field_id).val()) { return }

        // Build tooltip content
        let aliases_matched_html = '<ul class="list-group list-group-flush">'
        consumers.results.forEach(function (consumer) {
          const note = consumer.note
          note.email_confirmed = consumer.email_confirmed
          if (consumer.hasOwnProperty('membership') && consumer.membership) { note.membership = consumer.membership } else { note.membership = undefined }
          const extra_css = displayStyle(note)
          aliases_matched_html += li(alias_prefix + '_' + consumer.id,
            consumer.name,
            extra_css)
          notes.push(note)
        })
        aliases_matched_html += '</ul>'

        // Show tooltip
        field.attr('data-original-title', aliases_matched_html).tooltip('show')

        consumers.results.forEach(function (consumer) {
          const consumer_obj = $('#' + alias_prefix + '_' + consumer.id)
          consumer_obj.hover(function () {
            displayNote(consumer.note, consumer.name, user_note_field, profile_pic_field)
          })
          consumer_obj.click(function () {
            var disp = null
            notes_display.forEach(function (d) {
              // We compare the alias ids
              if (d.id === consumer.id) {
                d.quantity += 1
                disp = d
              }
            })
            // In the other case, we add a new emitter
            if (disp == null) {
              disp = {
                name: consumer.name,
                id: consumer.id,
                note: consumer.note,
                quantity: 1
              }
              notes_display.push(disp)
            }

            // If the function alias_click exists, it is called. If it doesn't return true, then the notes are
            // note displayed. Useful for a consumption when a button is already clicked
            if (alias_click && !alias_click()) { return }

            const note_list = $('#' + note_list_id)
            let html = ''
            notes_display.forEach(function (disp) {
              html += li(note_prefix + '_' + disp.id,
                disp.name +
                                '<span class="badge badge-dark badge-pill">' +
                                disp.quantity + '</span>',
                displayStyle(disp.note))
            })

            // Emitters are displayed
            note_list.html(html)

            // Update tooltip position
            field.tooltip('update')

            notes_display.forEach(function (disp) {
              const line_obj = $('#' + note_prefix + '_' + disp.id)
              // Hover an emitter display also the profile picture
              line_obj.hover(function () {
                displayNote(disp.note, disp.name, user_note_field, profile_pic_field)
              })

              // When an emitter is clicked, it is removed
              line_obj.click(removeNote(disp, note_prefix, notes_display, note_list_id, user_note_field,
                profile_pic_field))
            })
          })
        })
      })// end getJSON alias
  })
}// end function autocomplete

// When a validate button is clicked, we switch the validation status
function de_validate (id, validated, resourcetype) {
  const validate_obj = $('#validate_' + id)

  if (validate_obj.data('pending'))
  // The button is already clicked
  { return }

  const invalidity_reason = $('#invalidity_reason_' + id).val()
  validate_obj.html('<strong style="font-size: 16pt;">⟳</strong>')
  validate_obj.data('pending', true)

  // Perform a PATCH request to the API in order to update the transaction
  // If the user has insufficient rights, an error message will appear
  $.ajax({
    url: '/api/note/transaction/transaction/' + id + '/',
    type: 'PATCH',
    dataType: 'json',
    headers: {
      'X-CSRFTOKEN': CSRF_TOKEN
    },
    data: {
      resourcetype: resourcetype,
      valid: !validated,
      invalidity_reason: invalidity_reason
    },
    success: function () {
      refreshBalance()
      // error if this method doesn't exist. Please define it.
      refreshHistory()
    },
    error: function (err) {
      const errObj = JSON.parse(err.responseText)
      let error = errObj.detail ? errObj.detail : errObj.non_field_errors
      if (!error) { error = err.responseText }
      addMsg(gettext('An error occured while (in)validating this transaction:') + ' ' + error, 'danger')

      refreshBalance()
      // error if this method doesn't exist. Please define it.
      refreshHistory()
    }
  })
}

/**
 * Simple debouncer
 * @param callback Function to call
 * @param wait Debounced milliseconds
 */
let debounce_timeout
function debounce (callback, wait=500) {
  return (...args) => {
    const context = this
    clearTimeout(debounce_timeout)
    debounce_timeout = setTimeout(() => callback.apply(context, args), wait)
  }
}