import {mapGetters, mapActions} from 'vuex'
import FlowNode from './node'
import FlowLink from './link'
import FlowTriggerLink from './link-trigger'

import FlowPanZoom from './panzoom'
import HxContextMenu from '@/components/shared/hx-contextmenu'
import SvgDefs from './svgdefswrapper'
import utils from '@/utils/utils'

export default {
  name: 'FlowManager',
  components: {FlowNode, FlowLink, FlowTriggerLink, FlowPanZoom, HxContextMenu, SvgDefs},
  props: {
    'width': {type: String, default: '800px'},
    'height': {type: String, default: '600px'}
  },
  data () {
    // const cloned = JSON.parse(JSON.stringify(this.value)) // initial?
    return {
      panzoom: { x: 0, y: 0, zoom: 1 },

      // Shared state
      // nodeData: { nodes: [], links: [], triggers: [] },

      dragging: null,
      linking: false,
      triggerLinking: false,

      pointerLink: {active: false, props: {}, src: {}},
      pointerTriggerLink: {active: false, props: {}, src: {}},

      selector: null,
      nodeSelection: {}, // map of true false

      stickySockets: false,
      stickyTriggers: false,
      nodeActivity: true
    }
  },
  computed: {
    ...mapGetters('flow', ['registry', 'activity', 'nodeData', 'nodeById']),
    outputNode () {
      const n = this.nodeData.nodes.find(n => n.src === 'Output')

      return !!n
    },
    viewClasses () {
      return {
        'flow-linking': this.linking || this.stickySockets,
        'flow-triggers': this.triggerLinking || this.stickyTriggers,
        'activity': this.dragging || this.pointerLink.active,
        'flow-node--activity': this.nodeActivity,
        'selecting': !!this.selector
      }
    },
    nodeProps () {
      return (node) => {
        let highlight = {}
        if (this.pointerLink.active && this.pointerLink.src.nodeId !== node.id) {
          if (this.pointerLink.src.in !== undefined) {
            highlight = {type: 'socket-out', dtype: this.pointerLink.src.type}
          } else {
            highlight = {type: 'socket-in', dtype: this.pointerLink.src.type}
          }
        }
        if (this.pointerTriggerLink.active && this.pointerTriggerLink.src.nodeId !== node.id) {
          highlight = {type: (this.pointerTriggerLink.src.dir === 'in') ? 'trigger-in' : 'trigger-out'}
        }

        const nodeClass = this.registry[node.src]
        if (!nodeClass) {
          this.NODE_REMOVE([node])
          return
        }
        return {
          transform: `translate(${node.x} ${node.y})`,
          id: node.id,
          // Combine this into one
          match: highlight,
          dragging: this.dragging && !!this.dragging[node.id],
          activity: this.activity && this.activity.nodes && this.activity.nodes[node.id]
        }
      }
    },
    linkProps () {
      return (link) => {
        if (!this.$refs.nodes) return
        // For size .x .y
        const nodeFrom = this.nodeById(link.from)
        const nodeTo = this.nodeById(link.to)

        const refFrom = this.$refs.nodes.find(n => n.id === link.from)
        const refTo = this.$refs.nodes.find(n => n.id === link.to)
        if (!refFrom || !refTo) { // delete link
          return {}
        }

        const fromOutput = refFrom.outputPos(0) // only 1 output
        const toInput = refTo.inputPos(link.in)

        return {
          x1: nodeFrom.x + fromOutput.x,
          y1: nodeFrom.y + fromOutput.y,
          x2: nodeTo.x + toInput.x,
          y2: nodeTo.y + toInput.y,
          status: this.activity.nodes[nodeFrom.id] && this.activity.nodes[nodeFrom.id].status
        }
      }
    },
    triggerProps () {
      return (trigger) => {
        if (!this.$refs.nodes) return
        // For size .x .y
        const nodeFrom = this.nodeById(trigger.from)
        const nodeTo = this.nodeById(trigger.to)

        const refFrom = this.$refs.nodes.find(n => n.id === trigger.from)
        const refTo = this.$refs.nodes.find(n => n.id === trigger.to)
        if (!refFrom || !refTo) { // delete trigger
          return {}
        }

        const fromOutput = {
          x: 0,
          y: refFrom.bodyProps.height / 2
        }
        const toInput = {
          x: 0,
          y: -refTo.bodyProps.height / 2
        }

        return {
          x1: nodeFrom.x + fromOutput.x,
          y1: nodeFrom.y + fromOutput.y,
          x2: nodeTo.x + toInput.x,
          y2: nodeTo.y + toInput.y,
          status: this.activity.nodes[nodeFrom.id] && this.activity.nodes[nodeFrom.id].status
        }
      }
    }

  },
  mounted () {
    this.$nextTick(() => {
      this.$forceUpdate()
    })
    document.addEventListener('keydown', this.keyDown)
    document.addEventListener('keyup', this.keyUp)
  },
  beoreDestroy () {
    document.removeEventListener('keydown', this.keyDown)
    document.removeEventListener('keyup', this.keyUp)
  },
  methods: {
    ...mapActions('flow', [
      'NOTIFICATION_ADD',
      'DOCUMENT_SYNC',
      'NODE_RAISE', 'NODE_UPDATE', 'NODE_ADD', 'NODE_REMOVE', 'NODE_INSPECT', 'NODE_PROCESS', 'NODE_TRAIN',
      'LINK_ADD', 'LINK_REMOVE',
      'TRIGGER_ADD', 'TRIGGER_REMOVE' ]),

    keyDown (ev) {
      if (document.activeElement && document.activeElement.matches('input,textarea')) { return }
      if (ev.shiftKey) {
        this.linking = true
        this.triggerLinking = true
      }

      let single = null
      const selectionIds = Object.keys(this.nodeSelection)
      if (selectionIds.length === 1) { single = this.nodeSelection[selectionIds[0]] }
      switch (ev.key) {
        case 'Enter':
          if (!single) { return }
          this.nodeInspect(single)
          break
        case 'Delete':
          if (!this.nodeSelection) { return }
          console.log('Removing nodes:', this.nodeSelection)
          this.NODE_REMOVE(this.nodeSelection)
          // for (let k in this.nodeSelection) {
          // this.nodeRemove(this.nodeSelection[k])
          // }
          break
        case 'a':
          if (ev.ctrlKey) {
            ev.preventDefault()
            ev.stopPropagation()

            this.nodeSelection = {}
            for (let n of this.nodeData.nodes) {
              this.nodeSelection[n.id] = n
            }
          }

          break
      }
    },
    keyUp (ev) {
      if (!ev.shiftKey) {
        this.linking = false
        this.triggerLinking = false
      }
    },
    panzoomReset () {
      this.panzoom = {x: 0, y: 0, zoom: 1}
    },
    // XXX: Shrink this function
    // and create some LinkAdd method
    socketPointerDown (nodeId, ev, socket) {
      if (ev.button !== 0) return

      const nodeRef = this.$refs.nodes.find(n => n.id === nodeId)
      const node = this.nodeById(nodeId)
      const isInput = socket.in !== undefined
      const socketPos = isInput ? nodeRef.inputPos(socket.in) : nodeRef.outputPos(socket.out)

      // const p = this.transformedPoint(ev.clientX, ev.clientY)
      this.pointerLink.props = {
        x1: node.x + socketPos.x,
        y1: node.y + socketPos.y,
        x2: node.x + socketPos.x,
        y2: node.y + socketPos.y
      }

      this.pointerLink.active = true
      if (isInput) {
        this.pointerLink.src = {nodeId: nodeId, type: this.registry[node.src].inputs[socket.in].type, in: socket.in}
      } else {
        this.pointerLink.src = {nodeId: nodeId, type: this.registry[node.src].output.type, out: 0}
      }
      utils.createDrag({
        drag: (ev) => {
          const p = this.transformedPoint(ev.clientX, ev.clientY)
          if (isInput) {
            this.pointerLink.props.x1 = p.x
            this.pointerLink.props.y1 = p.y
          } else {
            this.pointerLink.props.x2 = p.x
            this.pointerLink.props.y2 = p.y
          }
        },
        drop: (ev) => {
          this.pointerLink.active = false

          // find Parent

          var curTarget = ev.target
          for (; curTarget.hasAttribute !== undefined && curTarget !== document.body; curTarget = curTarget.parentNode) {
            if (curTarget.hasAttribute('data-nodeid')) {
              break
            }
          }
          if (!curTarget.hasAttribute || curTarget === document.body) {
            console.error('LINK: target is not a socket')
            return
          }

          const targetNodeId = curTarget.getAttribute('data-nodeid')
          const targetIn = curTarget.getAttribute('data-in')
          const targetOut = curTarget.getAttribute('data-out')

          let link
          // target is input
          if (targetIn && !isInput) {
            link = {
              from: nodeId,
              to: targetNodeId,
              in: parseInt(targetIn)
            }
          } else if (targetOut && isInput) {
            link = {
              from: targetNodeId,
              to: nodeId,
              in: socket.in
            }
          }
          // No link
          if (!link) {
            console.error('LINK: input same direction (in->in/out->out)')
            return
          }
          const nodeFrom = this.nodeById(link.from)
          const nodeTo = this.nodeById(link.to)

          const output = this.registry[nodeFrom.src].output.type
          const input = this.registry[nodeTo.src].inputs[link.in].type
          // Type checking
          if (!(output === 'interface {}' || output === input || input === 'interface {}')) {
            console.error('LINK: Invalid type')
            return
          }

          // Input already exists, replace
          const existingInput = this.nodeData.links.find(l => l.to === link.to && l.in === link.in)
          if (existingInput) {
            // REMOVE LINK
            this.LINK_REMOVE(existingInput)
          }
          this.LINK_ADD(link)
        }})
    },
    triggerPointerDown (nodeId, ev, dir) {
      if (ev.button !== 0) return

      const nodeRef = this.$refs.nodes.find(n => n.id === nodeId)
      const node = this.nodeById(nodeId)

      const isInput = (dir === 'in')
      const triggerPos = {
        x: 0,
        y: nodeRef.bodyProps.height / 2 * (isInput ? -1 : 1)
      }
      this.pointerTriggerLink.src = {nodeId: node.id, dir: dir}

      this.pointerTriggerLink.props = {
        x1: node.x + triggerPos.x,
        y1: node.y + triggerPos.y,
        x2: node.x + triggerPos.x,
        y2: node.y + triggerPos.y
      }

      this.pointerTriggerLink.active = true
      utils.createDrag({
        drag: (ev) => {
          const p = this.transformedPoint(ev.clientX, ev.clientY)
          if (isInput) {
            this.pointerTriggerLink.props.x1 = p.x
            this.pointerTriggerLink.props.y1 = p.y
          } else {
            this.pointerTriggerLink.props.x2 = p.x
            this.pointerTriggerLink.props.y2 = p.y
          }
        },
        drop: (ev) => {
          this.pointerTriggerLink.active = false

          // find Parent
          var curTarget = ev.target
          for (; curTarget.hasAttribute !== undefined && curTarget !== document.body; curTarget = curTarget.parentNode) {
            if (curTarget.hasAttribute('data-nodeid')) {
              break
            }
          }
          if (!curTarget.hasAttribute || curTarget === document.body) {
            console.error('TRIGGER: target is not a socket')
            return
          }
          const targetNodeId = curTarget.getAttribute('data-nodeid')
          const targetDir = curTarget.getAttribute('data-dir')
          if (targetNodeId === node.id) {
            console.error('TRIGGER: cannot link to self')
            return
          }

          let trigger
          // target is input
          if (targetDir === 'in') {
            trigger = {
              from: nodeId,
              to: targetNodeId
            }
          } else {
            trigger = {
              from: targetNodeId,
              to: nodeId
            }
          }
          this.TRIGGER_ADD(trigger)
        }
      })
    },

    nodeInspect (tnode, force) {
      this.$emit('nodeInspect', tnode, force)
    },

    // HERE
    nodePointerDown (ev, i) {
      document.activeElement && document.activeElement.blur()
      const tnode = this.nodeData.nodes[i]
      if (ev.button === 1) {
        this.NODE_REMOVE([tnode])
        // this.nodeRemove(tnode)
        // remove related links
        return
      }
      if (ev.button !== 0) return // first button
      if (ev.shiftKey) {
        if (this.registry[tnode.src].output) {
          this.socketPointerDown(tnode.id, ev, {out: 0})
        }
        return
      }
      // this.NODE_INSPECT(tnode.id)
      this.nodeInspect(tnode)

      // Switch selection
      if (!this.nodeSelection[tnode.id] && !ev.ctrlKey) this.nodeSelection = {}
      this.nodeSelection[tnode.id] = tnode
      // we can handle with nodeId and a search

      this.NODE_RAISE(this.nodeSelection)

      let curP = this.transformedPoint(ev.x, ev.y)

      this.dragging = this.nodeSelection
      utils.createDrag({
        drag: (ev) => {
          if (this.nodeSelection === undefined) {
            console.error('Well something went wrong')
          }
          const dragP = this.transformedPoint(ev.x, ev.y)
          const nodeUpdate = []
          for (let k in this.nodeSelection) {
            // const n = this.nodeData.nodes.find(n => n.id === k)
            const n = this.nodeById(k)
            // create new nodes
            nodeUpdate.push({
              ...n,
              x: n.x + dragP.x - curP.x,
              y: n.y + dragP.y - curP.y
            })
          }
          this.NODE_UPDATE(nodeUpdate)
          // this.sendFlowEvent('nodeUpdate', this.nodeSelection)
          curP = dragP
        },
        drop: (ev) => {
          // snap?
          this.dragging = null
          // Snapping
          const dragP = this.transformedPoint(ev.x, ev.y)
          const nodeUpdate = []
          for (let k in this.nodeSelection) {
            // const n = this.nodeData.nodes.find(n => n.id === k)
            const n = this.nodeById(k)
            // create new nodes
            nodeUpdate.push({
              ...n,
              x: Math.round((n.x + dragP.x - curP.x) / 10) * 10,
              y: Math.round((n.y + dragP.y - curP.y) / 10) * 10
            })
          }
          // Updating nodes
          this.NODE_UPDATE(nodeUpdate)
          this.DOCUMENT_SYNC()
        }
      })
    },
    /// ////////////
    // NODE CREATOR FUNC
    //
    // STORE
    nodeAdd (src, x = 100, y = 100) {
      if (src === 'Output') {
        const n = this.nodeData.nodes.find(n => n.src === src)
        if (n) {
          this.NOTIFICATION_ADD('Output node already exists')
          return
        }
      }
      const newNode = {
        id: utils.guid(),
        x: x,
        y: y,
        defaultInputs: {},
        label: src,
        color: this.registry[src].style && this.registry[src].style.color, /* NEW 12/02/2018 */
        src: src
      }
      // Setup Props
      if (this.registry[src].props) {
        for (let k in this.registry[src].props) {
          newNode.prop || (newNode.prop = {})
          newNode.prop[k] = ''
        }
      }
      this.NODE_ADD(newNode)
    },

    managerDrop (ev) {
      ev.preventDefault()
      const reg = ev.dataTransfer.getData('text')
      if (this.registry[reg] === undefined) {
        console.error('Registry: Drop src not found in registry')
        return
      }
      const pt = this.transformedPoint(ev.x, ev.y)
      this.nodeAdd(reg, pt.x, pt.y)
    },
    viewPointerDown (ev) {
      if (ev.button !== 0) return
      ev.preventDefault()
      this.nodeSelection = {}
      const p = this.transformedPoint(ev.x, ev.y)
      this.selector = {x: p.x, y: p.y, width: 0, height: 0}
      utils.createDrag({
        drag: (evd) => {
          // transform again in case we changed zoom/pan
          const p = this.transformedPoint(ev.x, ev.y)
          const p2 = this.transformedPoint(evd.x, evd.y)
          const nwidth = p2.x - p.x
          const nheight = p2.y - p.y
          this.selector = {
            x: nwidth < 0 ? p2.x : p.x,
            y: nheight < 0 ? p2.y : p.y,
            width: nwidth < 0 ? -nwidth : nwidth,
            height: nheight < 0 ? -nheight : nheight
          }
        },
        drop: (ev) => {
          for (let n in this.nodeData.nodes) {
            const node = this.nodeData.nodes[n]
            if (node.x > this.selector.x && node.x < (this.selector.x + this.selector.width) &&
              node.y > this.selector.y && node.y < (this.selector.y + this.selector.height)
            ) {
              this.nodeSelection[node.id] = node
            }
          }
          this.selector = null
        }})
    },
    documentProcess () {
      const n = this.nodeData.nodes.find(n => n.src === 'Output')
      this.NODE_PROCESS(n.id)
    },
    createPortal (nodeID) {
      // Find nodeID
      let node = this.nodeData.nodes.find(n => n.id === nodeID)
      if (!node) {
        this.NOTIFICATION_ADD('invalid node ID' + nodeID)
        return
      }
      // Special node
      const portalNode = {
        id: utils.guid(),
        x: node.x + 10,
        y: node.y + 100, // Downthere/improve this
        defaultInputs: {},
        label: node.label,
        color: node.color,
        prop: {'portal from': nodeID},
        src: 'Portal From'
      }

      this.NODE_ADD(portalNode)
    },
    // HELPERS depending on svg ref
    createSVGPoint (x, y) {
      const p = this.$refs.svg.createSVGPoint()
      p.x = x; p.y = y
      return p
    },
    transformedPoint (x, y, abs) {
      const svgRect = this.$refs.svg.getBoundingClientRect()
      if (!abs) {
        x -= svgRect.left
        y -= svgRect.top
      }
      return this.$refs.panzoom.transformedPoint(this.createSVGPoint(x, y))
    }
  }
}