import { AfterViewInit, ChangeDetectorRef, Component, ElementRef, OnChanges, OnInit, QueryList, SimpleChanges, ViewChild, ViewChildren } from '@angular/core';

import {
  CdkDrag,
  CdkDragDrop,
  CdkDropList,
  CdkDropListGroup,
  moveItemInArray,
} from '@angular/cdk/drag-drop';

import { CommonModule } from '@angular/common';
import { WorldArea } from '../_models/world-area';
import { Plan, PlanElement } from '../_models/plan';
import { WorldAreaService } from '../_services/world-area.service';
import { FormsModule } from '@angular/forms';
import { Fuzzr } from '../fuzzr/fuzzr';
import { BehaviorSubject, first, from, skip } from 'rxjs';
import { save } from '@tauri-apps/plugin-dialog';
import { PlanService } from '../_services/plan.service';
import { MatDialog, MatDialogModule } from '@angular/material/dialog';
import { EditNotesComponentDialog } from './notes/notes.component';
import { open } from '@tauri-apps/plugin-dialog';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatSelectModule } from '@angular/material/select';
import { MatButtonModule } from '@angular/material/button';
import { MatSlideToggleModule } from '@angular/material/slide-toggle';

interface Act {
  value: number;
  name: string;
}

@Component({
  selector: 'plan-editor',
  templateUrl: './editor.component.html',
  styleUrls: ['./editor.component.scss'],
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    CdkDropListGroup,
    CdkDropList,
    CdkDrag,
    MatDialogModule,
    MatFormFieldModule,
    MatInputModule,
    MatSelectModule,
    MatButtonModule,
    MatSlideToggleModule,
  ],
  providers: []
})
export class EditorComponent implements OnInit {
  areas?: WorldArea[];
  planAreas: WorldArea[];
  areasMap?: Map<String, WorldArea>;
  areaSearchString: string = "";
  planSearchString: string = "";
  planFuzzer: Fuzzr;
  filterAct: Act;
  planFilterAct: Act;
  acts: Act[];
  @ViewChild('planListElement') planListElement!: ElementRef;
  autoScrollToEnd: boolean;
  reverseDisplay: boolean;
  disabledPlanDD: boolean;
  original: PlanElement[] = [];

  latestList: BehaviorSubject<PlanElement[]> = new BehaviorSubject<PlanElement[]>([]);

  constructor(public worldAreaService: WorldAreaService, private cdr: ChangeDetectorRef, private planService: PlanService, public dialog: MatDialog) {
    this.disabledPlanDD = false;

    this.autoScrollToEnd = false;

    this.latestList = new BehaviorSubject<any[]>([]);

    this.planFuzzer = new Fuzzr(this.original, {
      toString: (e: PlanElement) => {
        return this.areasMap?.get(e.area_key)?.name;
      }
    });

    this.planAreas = [];

    this.reverseDisplay = false;

    this.acts = [];
    for (let i = 0; i <= 10; i++) {
      if (i == 0) {
        this.acts.push({ value: i, name: "All" });
      } else {
        this.acts.push({ value: i, name: "Act " + i.toString() });
      }
    }

    this.filterAct = this.acts[0];
    this.planFilterAct = this.acts[0];
  }

  planSearchStringChange(value: string) {
    this.planSearchString = value;
    this.filterPlanElements();
  }
  planFilterActChange(value: Act) {
    this.planFilterAct = value;
    this.filterPlanElements();
  }
  reverseDisplayChange(value: boolean) {
    this.reverseDisplay = value;
    this.filterPlanElements();
  }

  ngOnInit(): void {
    this.worldAreaService.getWorldAreas().subscribe(worldAreas => {
      this.areas = [...worldAreas.values()];
      this.areasMap = worldAreas;
    });
  }

  sortPredicate(index: number, _item: CdkDrag<WorldArea> | CdkDrag<PlanElement>) {
    return !(this.planElemFilterBounds() && index == 0)
  }

  dropHandler(event: CdkDragDrop<WorldArea[]> | CdkDragDrop<PlanElement[]>) {
    if (event.previousContainer === event.container && !isWorldAreaEvent(event)) {
      const realCurrent = this.original.indexOf(event.previousContainer.data[event.currentIndex]);
      const realPrev = this.original.indexOf(event.previousContainer.data[event.previousIndex]);
      moveItemInArray(this.original, realPrev, realCurrent);
    } else {
      if (this.areas && isWorldAreaEvent(event)) {
        if (event.container.data.length > 0 && 'connections_world_areas_keys' in event.container.data[0]) {
          return;
        }

        const bounds = this.planElemFilterBounds();
        let index = event.currentIndex;
        if (bounds) {
          index += bounds[0];
        }
        this.original.splice(index, 0, this.planItemFromArea(event.previousContainer.data[event.previousIndex]));
      }
    }

    this.latestList.pipe(skip(1)).pipe(first()).subscribe(() => {
      this.scrollToEnd();
    });

    this.filterPlanElements();
  }

  dropEndHandler(event: CdkDragDrop<WorldArea[]> | CdkDragDrop<PlanElement[]> | null) {
    if (event == null) return;

    if (isWorldAreaEvent(event) && this.areas) {
      this.original.splice(this.getEnd(), 0, this.planItemFromArea(event.previousContainer.data[event.previousIndex]));
    } else {
      moveItemInArray(this.original, event.previousIndex, this.getEnd());
    }

    this.latestList.pipe(skip(1)).pipe(first()).subscribe(() => {
      this.scrollToEnd();
    });

    this.filterPlanElements();
  }

  getEnd() {
    let bounds = this.planElemFilterBounds();
    if (bounds) {
      return bounds[1];
    } else {
      return this.original.length;
    }
  }

  remove(item: PlanElement) {
    this.original.splice(this.planIndexOf(item), 1);

    this.filterPlanElements();
  }

  canDrop = () => {
    return !this.disabledPlanDD;
  }

  planItemFromArea(area: WorldArea): PlanElement {
    return {
      area_key: area.named_id,
      notes: undefined,
      uuid: undefined,
      edited: false
    };
  }

  filterAreas() {
    if (this.areaSearchString !== "" || this.filterAct.value != 0) {
      return this.worldAreaService.matcher!.search(this.areaSearchString).map(({ item }) => {
        return item[1];
      }).filter(item => item.act == this.filterAct.value || this.filterAct.value == 0);
    } else {
      return this.areas!;
    }
  }

  scrollToEnd() {
    if (!this.autoScrollToEnd) {
      return;
    }

    this.cdr.detectChanges();

    if (!this.reverseDisplay) {
      this.planListElement.nativeElement.scrollTop = this.planListElement.nativeElement.scrollHeight;
    } else {
      this.planListElement.nativeElement.scrollTop = 0;
    }

  }

  doubleClickArea(item: WorldArea) {
    this.original.splice(this.original.length, 0, this.planItemFromArea(item));

    this.latestList.pipe(skip(1)).pipe(first()).subscribe((_) => {
      this.scrollToEnd();
    });

    this.filterPlanElements();
  }

  planElemFilterBounds() {
    if (this.planFilterAct.value !== 0) {
      let bounds = this.original.filter(item => item.anchor_act === this.planFilterAct.value || this.planFilterAct.value + 1 === item.anchor_act).map((value) => this.planIndexOf(value));
      if (bounds.length == 2) {
        return bounds;
      }

      if (bounds.length == 1 && this.planFilterAct.value == 10) {
        bounds[1] = this.original.length;
        return bounds;
      }
    }

    return undefined;
  }

  filterPlanElements() {
    const value = (): any[] => {
      if (this.planSearchString !== "") {
        this.disabledPlanDD = true;
      } else {
        this.disabledPlanDD = false;
      }

      if (this.planSearchString !== "" || this.planFilterAct.value != 0) {
        let bounds = this.planElemFilterBounds();

        const searched = this.planFuzzer.search(this.planSearchString).map(({ item }) => item);

        if (bounds) {
          const definedBounds: number[] = bounds;
          return searched.filter(item => {
            const index = this.planIndexOf(item);
            return index >= definedBounds[0] && index < definedBounds[1];
          });
        } else {
          return searched.filter(item => {
            return this.areasMap?.get(item.area_key)?.act === this.planFilterAct.value || this.planFilterAct.value === 0;
          });
        }

      } else {
        return this.original;
      }
    }

    this.latestList.next([... (this.reverseDisplay ? value().slice().reverse() : value())]);
  }

  planIndexOf(planElement: PlanElement) {
    return this.original.indexOf(planElement);
  }

  clearPlan() {
    while (this.original.length > 0) {
      this.original.pop();
    }
    this.filterPlanElements();
    this.cdr.detectChanges();
  }

  save() {
    from(save({
      filters: [{
        name: 'JSON (.json)',
        extensions: ['json']
      }]
    })).subscribe(file => {
      if (file) {
        const plan = new Plan();
        plan.plan = [...this.original];
        this.planService.savePlanAtPath(file, plan).subscribe();
      }
    });
  }

  openPlan() {
    from(open({
      multiple: false,
      filters: [
        {
          name: "JSON (.json)",
          extensions: ['json']
        }
      ]
    })).subscribe(file => {
      if (file) {
        // We disallow multiple but interface still says it can be multiple, thus the cast.
        this.planService.loadPlanFromPath(file.path as string, false).subscribe(plan => {
          while (this.original.length > 0) {
            this.original.pop();
          }
          plan.plan.forEach(item => this.original.push(item));
          this.filterPlanElements();
        });
      }
    });
  }

  loadBasePlan() {
    this.planService.getBasePlan().subscribe(plan => {
      while (this.original.length > 0) {
        this.original.pop();
      }
      plan.plan.forEach(item => this.original.push(item));
      this.filterPlanElements();
    })
  }

  addNote(event: MouseEvent, item: PlanElement) {
    event.preventDefault();

    const dialogRef = this.dialog.open(EditNotesComponentDialog, {
      data: {
        note: item.notes
      },
      disableClose: true
    },)

    dialogRef.afterClosed().subscribe(note => {
      if (note != undefined && note != null) {
        if (item.notes !== note) {
          item.edited = true;
        }
        item.notes = note;
      }
    })

  }
}

function isWorldAreaEvent(event: any): event is CdkDragDrop<WorldArea[]> {
  return (event.previousContainer.data.length > 0 && 'connections_world_areas_keys' in event.previousContainer.data[0]);
}