_ = require 'underscore'
{Contenteditable, RetinaImg, Flexbox} = require 'nylas-component-kit'
{AccountStore, Utils, React} = require 'nylas-exports'
TemplateStore = require './template-store'
TemplateEditor = require './template-editor'

class PreferencesTemplates extends React.Component
  @displayName: 'PreferencesTemplates'

  constructor: (@props) ->
    @_templateSaveQueue = {}

    {templates, selectedTemplate, selectedTemplateName} = @_getStateFromStores()
    @state =
      editAsHTML: false
      editState: if templates.length==0 then "new" else null
      templates: templates
      selectedTemplate: selectedTemplate
      selectedTemplateName: selectedTemplateName
      contents: null

  componentDidMount: ->
    @usub = TemplateStore.listen @_onChange

  componentWillUnmount: ->
    @usub()
    if @state.selectedTemplate?
      @_saveTemplateNow(@state.selectedTemplate.name, @state.contents)



  #SAVING AND LOADING TEMPLATES
  _loadTemplateContents: (template) =>
    if template
      TemplateStore.getTemplateContents(template.id, (contents) =>
        @setState({contents: contents})
      )

  _saveTemplateNow: (name, contents, callback) =>
    TemplateStore.saveTemplate(name, contents, callback)

  _saveTemplateSoon: (name, contents) =>
    @_templateSaveQueue[name] = contents
    @_saveTemplatesFromCache()

  __saveTemplatesFromCache: =>
    for name, contents of @_templateSaveQueue
      @_saveTemplateNow(name, contents)

    @_templateSaveQueue = {}

  _saveTemplatesFromCache: _.debounce(PreferencesTemplates::__saveTemplatesFromCache, 500)



  # OVERALL STATE HANDLING
  _onChange: =>
    @setState @_getStateFromStores()

  _getStateFromStores: ->
    templates = TemplateStore.items()
    #selectedTemplate = _.findWhere(templates, {id: @state?.selectedTemplate?.id}) || templates[0]

    selectedTemplate = @state?.selectedTemplate
    # deleted
    if selectedTemplate? and selectedTemplate.id not in _.pluck(templates, "id")
      selectedTemplate = null
    # none selected
    else if not selectedTemplate
      selectedTemplate = if templates.length > 0 then templates[0] else null
    @_loadTemplateContents(selectedTemplate)
    if selectedTemplate
      selectedTemplateName = @state?.selectedTemplateName || selectedTemplate.name
    return {templates, selectedTemplate, selectedTemplateName}



  # TEMPLATE CONTENT EDITING

  _onEditTemplate: (event) =>
    html = event.target.value
    @setState contents: html
    if @state.selectedTemplate?
      @_saveTemplateSoon(@state.selectedTemplate.name, html)


  _onSelectTemplate: (event) =>
    if @state.selectedTemplate?
      @_saveTemplateNow(@state.selectedTemplate.name, @state.contents)
    selectedTemplate = null
    for template in @state.templates
      if template.id == event.target.value
        selectedTemplate = template
    @setState
      selectedTemplate: selectedTemplate
      selectedTemplateName: selectedTemplate?.name
      contents: null
    @_loadTemplateContents(selectedTemplate)

  _renderTemplatePicker: ->
    options = @state.templates.map (template) ->
      <option value={template.id} key={template.id}>{template.name}</option>

    <select value={@state.selectedTemplate?.id} onChange={@_onSelectTemplate}>
      {options}
    </select>

  _renderEditableTemplate: ->
    <Contenteditable
       ref="templateInput"
       value={@state.contents || ""}
       onChange={@_onEditTemplate}
       extensions={[TemplateEditor]}
       spellcheck={false} />

  _renderHTMLTemplate: ->
    <textarea ref="templateHTMLInput"
              value={@state.contents || ""}
              onChange={@_onEditTemplate}/>

  _renderModeToggle: ->
    if @state.editAsHTML
      return <a onClick={=> @setState(editAsHTML: false); return}>Edit live preview</a>
    else
      return <a onClick={=> @setState(editAsHTML: true); return}>Edit raw HTML</a>



  # TEMPLATE NAME EDITING
  _renderEditName: ->
    <div className="section-title">
      Template Name: <input type="text" className="template-name-input" value={@state.selectedTemplateName} onChange={@_onEditName}/>
      <button className="btn template-name-btn" onClick={@_saveName}>Save Name</button>
      <button className="btn template-name-btn" onClick={@_cancelEditName}>Cancel</button>
    </div>

  _renderName: ->
    rawText = if @state.editAsHTML then "Raw HTML " else ""
    <div className="section-title">
      {rawText}Template: {@_renderTemplatePicker()}
      <button className="btn template-name-btn" title="New template" onClick={@_startNewTemplate}>New</button>
      <button className="btn template-name-btn" onClick={ => @setState(editState: "name") }>Rename</button>
    </div>

  _onEditName: =>
    @setState({selectedTemplateName: event.target.value})

  _cancelEditName: =>
    @setState
      selectedTemplateName: @state.selectedTemplate?.name
      editState: null

  _saveName: =>
    if @state.selectedTemplate?.name != @state.selectedTemplateName
      TemplateStore.renameTemplate(@state.selectedTemplate.name, @state.selectedTemplateName, (renamedTemplate) =>
        @setState
          selectedTemplate: renamedTemplate
          editState: null
      )
    else
      @setState
        editState: null


  # DELETE AND NEW
  _deleteTemplate: =>
    numTemplates = @state.templates.length
    if @state.selectedTemplate?
      TemplateStore.deleteTemplate(@state.selectedTemplate.name)
    if numTemplates==1
      @setState
        editState: "new"
        selectedTemplate: null
        selectedTemplateName: ""
        contents: ""

  _startNewTemplate: =>
    @setState
      editState: "new"
      selectedTemplate: null
      selectedTemplateName: ""
      contents: ""

  _saveNewTemplate: =>
    TemplateStore.saveNewTemplate(@state.selectedTemplateName, @state.contents || "", (template) =>
      @setState
        selectedTemplate: template
        editState: null
    )

  _cancelNewTemplate: =>
    template = if @state.templates.length>0 then @state.templates[0] else null
    @setState
      selectedTemplate: template
      selectedTemplateName: template?.name
      editState: null
    @_loadTemplateContents(template)

  _renderCreateNew: ->
    cancel = <button className="btn template-name-btn" onClick={@_cancelNewTemplate}>Cancel</button>
    <div className="section-title">
      Template Name: <input type="text" className="template-name-input" value={@state.selectedTemplateName} onChange={@_onEditName}/>
      <button className="btn btn-emphasis template-name-btn" onClick={@_saveNewTemplate}>Save</button>
      {if @state.templates.length then cancel}
    </div>


  # MAIN RENDER
  render: =>
    deleteBtn =
      <button className="btn template-name-btn" title="Delete template" onClick={@_deleteTemplate}>
        <RetinaImg name="icon-composer-trash.png" mode={RetinaImg.Mode.ContentIsMask} />
      </button>

    editor =
      <div>
        <div className="template-wrap">
          {if @state.editAsHTML then @_renderHTMLTemplate() else @_renderEditableTemplate()}
        </div>
        <span className="editor-note">
          { if _.size(@_templateSaveQueue) > 0 then "Saving changes..." else "Changes saved." }
        </span>
        <span style={float:"right"}>{if @state.editState == null then deleteBtn else ""}</span>
        <div className="toggle-mode" style={marginTop: "1em"}>
          {@_renderModeToggle()}
        </div>
      </div>

    noTemplatesMessage =
    <div className="template-status-bar no-templates-message">
      You don't have any templates! Enter a template name and press Save to create one.
    </div>

    <div>
    <section className="container-templates" style={if @state.editState is "new" then {marginBottom:50}}>
      <h2>Quick Replies</h2>
      {
        switch @state.editState
          when "name" then @_renderEditName()
          when "new" then @_renderCreateNew()
          else @_renderName()
      }
      {if @state.editState isnt "new" then editor}
      {if @state.templates.length==0 then noTemplatesMessage}
    </section>

    <section className="templates-instructions">
    <p>
      The Quick Replies plugin allows you to create templated email replies, with variables that
      you can quickly fill in before sending your email message. To create a variable, type a set of double curly
      brackets wrapping the variable's name, like this: <strong>{"{{"}variable_name{"}}"}</strong>
    </p>
    <p>
      Reply templates are saved in the <strong>~/.nylas/templates</strong> directory on your computer. Each template
      is an HTML file - the name of the file is the name of the template, and its contents are the default message body.
    </p>
    <p>
      In raw HTML, variables are defined as HTML &lt;code&gt; tags with class "var empty". Typing curly brackets creates a tag
      automatically. The code tags are colored yellow to show the variable regions, but will be stripped out before the message is sent.
    </p>

    </section>
    </div>

module.exports = PreferencesTemplates