import { app } from '../../scripts/app'
import { api } from '../../scripts/api'
import { ComfyDialog, $el } from '../../scripts/ui'
import { GroupNodeConfig, GroupNodeHandler } from './groupNode'
import { LGraphCanvas } from '@comfyorg/litegraph'
import { useToastStore } from '@/stores/toastStore'

// Adds the ability to save and add multiple nodes as a template
// To save:
// Select multiple nodes (ctrl + drag to select a region or ctrl+click individual nodes)
// Right click the canvas
// Save Node Template -> give it a name
//
// To add:
// Right click the canvas
// Node templates -> click the one to add
//
// To delete/rename:
// Right click the canvas
// Node templates -> Manage
//
// To rearrange:
// Open the manage dialog and Drag and drop elements using the "Name:" label as handle

const id = 'Comfy.NodeTemplates'
const file = 'comfy.templates.json'

class ManageTemplates extends ComfyDialog {
  templates: any[]
  draggedEl: HTMLElement | null
  saveVisualCue: number | null
  emptyImg: HTMLImageElement
  importInput: HTMLInputElement

  constructor() {
    super()
    this.load().then((v) => {
      this.templates = v
    })

    this.element.classList.add('comfy-manage-templates')
    this.draggedEl = null
    this.saveVisualCue = null
    this.emptyImg = new Image()
    this.emptyImg.src =
      'data:image/gif;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs='

    this.importInput = $el('input', {
      type: 'file',
      accept: '.json',
      multiple: true,
      style: { display: 'none' },
      parent: document.body,
      onchange: () => this.importAll()
    }) as HTMLInputElement
  }

  createButtons() {
    const btns = super.createButtons()
    btns[0].textContent = 'Close'
    btns[0].onclick = (e) => {
      clearTimeout(this.saveVisualCue)
      this.close()
    }
    btns.unshift(
      $el('button', {
        type: 'button',
        textContent: 'Export',
        onclick: () => this.exportAll()
      })
    )
    btns.unshift(
      $el('button', {
        type: 'button',
        textContent: 'Import',
        onclick: () => {
          this.importInput.click()
        }
      })
    )
    return btns
  }

  async load() {
    let templates = []
    if (app.storageLocation === 'server') {
      if (app.isNewUserSession) {
        // New user so migrate existing templates
        const json = localStorage.getItem(id)
        if (json) {
          templates = JSON.parse(json)
        }
        await api.storeUserData(file, json, { stringify: false })
      } else {
        const res = await api.getUserData(file)
        if (res.status === 200) {
          try {
            templates = await res.json()
          } catch (error) {}
        } else if (res.status !== 404) {
          console.error(res.status + ' ' + res.statusText)
        }
      }
    } else {
      const json = localStorage.getItem(id)
      if (json) {
        templates = JSON.parse(json)
      }
    }

    return templates ?? []
  }

  async store() {
    if (app.storageLocation === 'server') {
      const templates = JSON.stringify(this.templates, undefined, 4)
      localStorage.setItem(id, templates) // Backwards compatibility
      try {
        await api.storeUserData(file, templates, { stringify: false })
      } catch (error) {
        console.error(error)
        useToastStore().addAlert(error.message)
      }
    } else {
      localStorage.setItem(id, JSON.stringify(this.templates))
    }
  }

  async importAll() {
    for (const file of this.importInput.files) {
      if (file.type === 'application/json' || file.name.endsWith('.json')) {
        const reader = new FileReader()
        reader.onload = async () => {
          const importFile = JSON.parse(reader.result as string)
          if (importFile?.templates) {
            for (const template of importFile.templates) {
              if (template?.name && template?.data) {
                this.templates.push(template)
              }
            }
            await this.store()
          }
        }
        await reader.readAsText(file)
      }
    }

    this.importInput.value = null

    this.close()
  }

  exportAll() {
    if (this.templates.length == 0) {
      useToastStore().addAlert('No templates to export.')
      return
    }

    const json = JSON.stringify({ templates: this.templates }, null, 2) // convert the data to a JSON string
    const blob = new Blob([json], { type: 'application/json' })
    const url = URL.createObjectURL(blob)
    const a = $el('a', {
      href: url,
      download: 'node_templates.json',
      style: { display: 'none' },
      parent: document.body
    })
    a.click()
    setTimeout(function () {
      a.remove()
      window.URL.revokeObjectURL(url)
    }, 0)
  }

  show() {
    // Show list of template names + delete button
    super.show(
      $el(
        'div',
        {},
        this.templates.flatMap((t, i) => {
          let nameInput
          return [
            $el(
              'div',
              {
                dataset: { id: i.toString() },
                className: 'templateManagerRow',
                style: {
                  display: 'grid',
                  gridTemplateColumns: '1fr auto',
                  border: '1px dashed transparent',
                  gap: '5px',
                  backgroundColor: 'var(--comfy-menu-bg)'
                },
                ondragstart: (e) => {
                  this.draggedEl = e.currentTarget
                  e.currentTarget.style.opacity = '0.6'
                  e.currentTarget.style.border = '1px dashed yellow'
                  e.dataTransfer.effectAllowed = 'move'
                  e.dataTransfer.setDragImage(this.emptyImg, 0, 0)
                },
                ondragend: (e) => {
                  e.target.style.opacity = '1'
                  e.currentTarget.style.border = '1px dashed transparent'
                  e.currentTarget.removeAttribute('draggable')

                  // rearrange the elements
                  this.element
                    .querySelectorAll('.templateManagerRow')
                    .forEach((el: HTMLElement, i) => {
                      var prev_i = Number.parseInt(el.dataset.id)

                      if (el == this.draggedEl && prev_i != i) {
                        this.templates.splice(
                          i,
                          0,
                          this.templates.splice(prev_i, 1)[0]
                        )
                      }
                      el.dataset.id = i.toString()
                    })
                  this.store()
                },
                ondragover: (e) => {
                  e.preventDefault()
                  if (e.currentTarget == this.draggedEl) return

                  let rect = e.currentTarget.getBoundingClientRect()
                  if (e.clientY > rect.top + rect.height / 2) {
                    e.currentTarget.parentNode.insertBefore(
                      this.draggedEl,
                      e.currentTarget.nextSibling
                    )
                  } else {
                    e.currentTarget.parentNode.insertBefore(
                      this.draggedEl,
                      e.currentTarget
                    )
                  }
                }
              },
              [
                $el(
                  'label',
                  {
                    textContent: 'Name: ',
                    style: {
                      cursor: 'grab'
                    },
                    onmousedown: (e) => {
                      // enable dragging only from the label
                      if (e.target.localName == 'label')
                        e.currentTarget.parentNode.draggable = 'true'
                    }
                  },
                  [
                    $el('input', {
                      value: t.name,
                      dataset: { name: t.name },
                      style: {
                        transitionProperty: 'background-color',
                        transitionDuration: '0s'
                      },
                      onchange: (e) => {
                        clearTimeout(this.saveVisualCue)
                        var el = e.target
                        var row = el.parentNode.parentNode
                        this.templates[row.dataset.id].name =
                          el.value.trim() || 'untitled'
                        this.store()
                        el.style.backgroundColor = 'rgb(40, 95, 40)'
                        el.style.transitionDuration = '0s'
                        // @ts-expect-error
                        // In browser env the return value is number.
                        this.saveVisualCue = setTimeout(function () {
                          el.style.transitionDuration = '.7s'
                          el.style.backgroundColor = 'var(--comfy-input-bg)'
                        }, 15)
                      },
                      onkeypress: (e) => {
                        var el = e.target
                        clearTimeout(this.saveVisualCue)
                        el.style.transitionDuration = '0s'
                        el.style.backgroundColor = 'var(--comfy-input-bg)'
                      },
                      $: (el) => (nameInput = el)
                    })
                  ]
                ),
                $el('div', {}, [
                  $el('button', {
                    textContent: 'Export',
                    style: {
                      fontSize: '12px',
                      fontWeight: 'normal'
                    },
                    onclick: (e) => {
                      const json = JSON.stringify({ templates: [t] }, null, 2) // convert the data to a JSON string
                      const blob = new Blob([json], {
                        type: 'application/json'
                      })
                      const url = URL.createObjectURL(blob)
                      const a = $el('a', {
                        href: url,
                        download: (nameInput.value || t.name) + '.json',
                        style: { display: 'none' },
                        parent: document.body
                      })
                      a.click()
                      setTimeout(function () {
                        a.remove()
                        window.URL.revokeObjectURL(url)
                      }, 0)
                    }
                  }),
                  $el('button', {
                    textContent: 'Delete',
                    style: {
                      fontSize: '12px',
                      color: 'red',
                      fontWeight: 'normal'
                    },
                    onclick: (e) => {
                      const item = e.target.parentNode.parentNode
                      item.parentNode.removeChild(item)
                      this.templates.splice(item.dataset.id * 1, 1)
                      this.store()
                      // update the rows index, setTimeout ensures that the list is updated
                      var that = this
                      setTimeout(function () {
                        that.element
                          .querySelectorAll('.templateManagerRow')
                          .forEach((el: HTMLElement, i) => {
                            el.dataset.id = i.toString()
                          })
                      }, 0)
                    }
                  })
                ])
              ]
            )
          ]
        })
      )
    )
  }
}

app.registerExtension({
  name: id,
  setup() {
    const manage = new ManageTemplates()

    const clipboardAction = async (cb) => {
      // We use the clipboard functions but dont want to overwrite the current user clipboard
      // Restore it after we've run our callback
      const old = localStorage.getItem('litegrapheditor_clipboard')
      await cb()
      localStorage.setItem('litegrapheditor_clipboard', old)
    }

    const orig = LGraphCanvas.prototype.getCanvasMenuOptions
    LGraphCanvas.prototype.getCanvasMenuOptions = function () {
      const options = orig.apply(this, arguments)

      options.push(null)
      options.push({
        content: `Save Selected as Template`,
        disabled: !Object.keys(app.canvas.selected_nodes || {}).length,
        callback: () => {
          const name = prompt('Enter name')
          if (!name?.trim()) return

          clipboardAction(() => {
            app.canvas.copyToClipboard()
            let data = localStorage.getItem('litegrapheditor_clipboard')
            data = JSON.parse(data)
            const nodeIds = Object.keys(app.canvas.selected_nodes)
            for (let i = 0; i < nodeIds.length; i++) {
              const node = app.graph.getNodeById(nodeIds[i])
              const nodeData = node?.constructor.nodeData

              let groupData = GroupNodeHandler.getGroupData(node)
              if (groupData) {
                groupData = groupData.nodeData
                // @ts-expect-error
                if (!data.groupNodes) {
                  // @ts-expect-error
                  data.groupNodes = {}
                }
                // @ts-expect-error
                data.groupNodes[nodeData.name] = groupData
                // @ts-expect-error
                data.nodes[i].type = nodeData.name
              }
            }

            manage.templates.push({
              name,
              data: JSON.stringify(data)
            })
            manage.store()
          })
        }
      })

      // Map each template to a menu item
      const subItems = manage.templates.map((t) => {
        return {
          content: t.name,
          callback: () => {
            clipboardAction(async () => {
              const data = JSON.parse(t.data)
              await GroupNodeConfig.registerFromWorkflow(data.groupNodes, {})
              localStorage.setItem('litegrapheditor_clipboard', t.data)
              app.canvas.pasteFromClipboard()
            })
          }
        }
      })

      subItems.push(null, {
        content: 'Manage',
        callback: () => manage.show()
      })

      options.push({
        content: 'Node Templates',
        submenu: {
          options: subItems
        }
      })

      return options
    }
  }
})