import {
  mdiCallSplit,
  mdiAbTesting,
  mdiCheck,
  mdiClose,
  mdiChevronRight,
  mdiExclamation,
  mdiTimerOutline,
  mdiTrafficLight,
  mdiRefresh,
  mdiArrowUp,
  mdiCodeJson,
  mdiCheckBoxOutline,
  mdiCheckboxBlankOutline,
  mdiAsterisk,
} from "@mdi/js";

const ICONS = {
  new: mdiAsterisk,
  service: mdiChevronRight,
  condition: mdiAbTesting,
  TRUE: mdiCheck,
  FALSE: mdiClose,
  delay: mdiTimerOutline,
  wait_template: mdiTrafficLight,
  event: mdiExclamation,
  repeat: mdiRefresh,
  repeatReturn: mdiArrowUp,
  choose: mdiCallSplit,
  chooseChoice: mdiCheckBoxOutline,
  chooseDefault: mdiCheckboxBlankOutline,
  YAML: mdiCodeJson,
};

import { TreeNode} from "./script-graph";
import { Action } from "./types";

const OPTIONS = [
  "condition",
  "delay",
  "device_id",
  "event",
  "scene",
  "service",
  "wait_template",
  "repeat",
  "choose",
];

interface NodeHandler {
  (action, selected: any[], select, update): TreeNode;
}

const SPECIAL = {
  condition: (action, selected, select, update) => {
    return {
      icon: ICONS["condition"],
      clickCallback: () => select([1], action, update),
      children: [
        {
          icon: ICONS["TRUE"],
          clickCallback: () => select([2], action, update),
          styles: selected[0]
            ? "stroke: orange;"
            : undefined,
        },
        {
          icon: ICONS["FALSE"],
          end: false,
          clickCallback: () => select([3], action, update),
          styles: selected[0]
            ? "stroke: orange;"
            : undefined,
        },
      ],
    }
  },

  repeat: (action, selected, select, update) => {
    let seq = action.repeat.sequence;
    if(!seq || !seq.length) seq = [{}];
    const seqHandler = new ActionHandler(seq);
    if(selected[0] !== undefined && selected[0] !== -1)
      seqHandler.selected = selected;
    seqHandler.selectCallback = select;
    seqHandler.updateCallback = (a) => {
      action.repeat["sequence"] = a;
      update(action);
    }

    return {
      icon: ICONS["repeat"],
      clickCallback: () => select([-1], action, update),
      children: [
        {
          icon: ICONS["repeatReturn"],
          clickCallback: () => select([-1], action, update),
          styles: selected[0] === -1
            ? "stroke: orange;"
            : undefined,
        },
        seqHandler.graph,
      ],
    };
  },

  choose: (action, selected, select, update) => {

    let def = action.default || [{}];
    const defaultHandler = new ActionHandler(def);
    if(selected[0] === -2)
      defaultHandler.selected = selected.slice(1);
    defaultHandler.selectCallback = (i, a, u) => {
      select( [-2].concat(i), a, u);
    };
    defaultHandler.updateCallback = (a) => {
      action.default = defaultHandler.actions;
      update(action);
    };


    return {
      icon: ICONS["choose"],
      clickCallback: () => select([-1], action, update),
      children: [
        ...action.choose.map((b,idx) => {
          const handler = new ActionHandler(b.sequence || [{}]);
          if(selected[0] === idx)
            handler.selected = selected.slice(1);
          handler.selectCallback = (i, a, u) => {
            select([idx].concat(i), a, u);
          };
          handler.updateCallback = (a) => {
            b.sequence = handler.actions;
            action.choose[idx] = b;
            update(action);
          };

          return [
            {
              icon: ICONS["chooseChoice"],
              clickCallback: () => select([idx], b, (a) => {
                action.choose[idx] = a;
                update(action);
              }),
              styles: selected[0] === idx
                ? "stroke: orange;"
                : undefined,
            },
            handler.graph,
          ];

        }),

        [
          {
            icon: ICONS["chooseDefault"],
            clickCallback: () => select([-2], def, (a) => {
              action.default = a;
              update(action);
            }),
            styles: selected[0] === -2
              ? "stroke: orange;"
              : undefined,
          },
          defaultHandler.graph,
        ]
      ],
    };
  },

};

interface NoAction {
}

export class ActionHandler {
  _actions: (Action | NoAction)[] = [];
  updateCallback = null;
  selectCallback = null;
  selected: number[] = [];

  constructor(actions: (Action | NoAction)[] = []) {
    this._actions = actions;
  }

  set actions(actions) {
    this._actions = actions;
  }

  get actions() {
    if(!this._actions.length) this._actions =  [{}];
    return this._actions;
  }

  get graph() {
    return this.actions.map((action, idx) => this._make_graph_node(idx, action));
  }

  _update_action(idx: number, action) {
    if(action === null)
      this.actions.splice(idx, 1);
    else
      this.actions[idx] = action;
    if (this.updateCallback)
      this.updateCallback(this.actions);
  }

  _add_action(idx: number) {
    this.actions.splice(idx, 0, {});
    if (this.updateCallback)
      this.updateCallback(this.actions);
    this._select_node([idx], {}, (a) =>this._update_action(idx, a));
  }

  _select_node(path: number[], action, update=null) {
    this.selected = path;
    if (this.selectCallback)
      this.selectCallback(path, action, update);
  }

  _make_graph_node(idx: number, action): TreeNode {
    let _type = "yaml";
    if (Object.keys(action).length === 0)
      _type = "new";
    else
      _type = OPTIONS.find((option) => option in action) || "YAML";

    const selected = this.selected.length >= 1 && this.selected[0] == idx;
    let node: TreeNode = {icon: ""};

    if (_type in SPECIAL) {
      node = SPECIAL[_type](
        action,
        selected ? this.selected.slice(1): [],
        (i, a, u) => this._select_node([idx].concat(i), a, u),
        (a) => this._update_action(idx, a),
      );
    } else {
      node = {
        icon: ICONS[_type],
        clickCallback: () => {
          this._select_node(
            [idx],
            action,
            (a) => this._update_action(idx, a)
          )
        }
      }
    }
    return {
      ...node,
      addCallback: () => this._add_action(idx+1),
      styles: selected
        ? "stroke: orange"
        : _type === "new"
          ? "stroke: lightgreen;"
          : undefined,
    }
  }

}