'use strict';

import { Component,
  Input,
  Renderer,
  ElementRef,
  OnInit,
  ChangeDetectionStrategy,
  ChangeDetectorRef
} from '@angular/core';

import { BaseSearchableComponent, SpecManager } from '../base';
import { SchemaNormalizer, SchemaHelper, AppStateService } from '../../services/';
import { JsonPointer, DescendantInfo } from '../../utils/';
import { Zippy } from '../../shared/components';
import { JsonSchemaLazy } from './json-schema-lazy';

@Component({
  selector: 'json-schema',
  templateUrl: './json-schema.html',
  styleUrls: ['./json-schema.css'],
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class JsonSchema extends BaseSearchableComponent implements OnInit {
  @Input() pointer: string;
  @Input() absolutePointer: string;
  @Input() final: boolean = false;
  @Input() nestOdd: boolean;
  @Input() childFor: string;
  @Input() isRequestSchema: boolean;

  schema: any = {};
  activeDescendant:any = {};
  discriminator: string = null;
  _hasSubSchemas: boolean = false;
  properties: any;
  _isArray: boolean;
  normalizer: SchemaNormalizer;
  descendants: DescendantInfo[];

  constructor(
    specMgr:SpecManager,
    app: AppStateService,
    private _renderer: Renderer,
    private cdr: ChangeDetectorRef,
    private _elementRef: ElementRef) {
    super(specMgr, app);
    this.normalizer = new SchemaNormalizer(specMgr);
  }

  get normPointer() {
    return this.schema._pointer || this.pointer;
  }

  selectDescendantByIdx(idx) {
    this.selectDescendant(this.descendants[idx]);
  }

  selectDescendant(activeDescendant: DescendantInfo) {
    if (!activeDescendant || activeDescendant.active) return;
    this.descendants.forEach(d => {
      d.active = false;
    });
    activeDescendant.active = true;

    this.schema = this.specMgr.getDescendant(activeDescendant, this.componentSchema);
    this.pointer = this.schema._pointer || activeDescendant.$ref;
    this.normalizer.reset();
    this.schema = this.normalizer.normalize(this.schema, this.normPointer,
      {resolved: true});
    this.preprocessSchema();
    this.activeDescendant = activeDescendant;
  }

  initDescendants() {
    this.descendants = this.specMgr.findDerivedDefinitions(this.normPointer, this.schema);
    if (!this.descendants.length) return;
    let discriminator = this.discriminator = this.schema.discriminator || this.schema['x-extendedDiscriminator'];
    let discrProperty = this.schema.properties &&
      this.schema.properties[discriminator];
    if (discrProperty && discrProperty.enum) {
      let enumOrder = {};
      discrProperty.enum.forEach((enumItem, idx) => {
        enumOrder[enumItem] = idx;
      });

      this.descendants = this.descendants
      .filter(a => {
        return enumOrder[a.name] != undefined;
      }).sort((a, b) => {
        return enumOrder[a.name] > enumOrder[b.name] ? 1 : -1;
      });
      this.descendants.forEach((d, idx) => d.idx = idx);
    }
    this.selectDescendantByIdx(0);
  }

  init() {
    if (!this.pointer) return;
    if (!this.absolutePointer) this.absolutePointer = this.pointer;

    this.schema = this.componentSchema;
    if (!this.schema) {
      throw new Error(`Can't load component schema at ${this.pointer}`);
    }

    this.applyStyling();

    this.schema = this.normalizer.normalize(this.schema, this.normPointer, {resolved: true});
    this.schema = SchemaHelper.unwrapArray(this.schema, this.normPointer);
    this._isArray = this.schema._isArray;
    this.absolutePointer += (this._isArray ? '/items' : '');
    this.initDescendants();
    this.preprocessSchema();
  }

  preprocessSchema() {
    SchemaHelper.preprocess(this.schema, this.normPointer, this.pointer);

    if (!this.schema.isTrivial) {
      SchemaHelper.preprocessProperties(this.schema, this.normPointer, {
        childFor: this.childFor,
        discriminator: this.discriminator
      });
    }

    this.properties = this.schema._properties || [];
    if (this.isRequestSchema) {
      this.properties = this.properties && this.properties.filter(prop => !prop.readOnly);
    }

    this._hasSubSchemas = this.properties && this.properties.some(
      propSchema => {
        if (propSchema.type === 'array') {
          propSchema = propSchema.items;
        }
        return (propSchema && propSchema.type === 'object' && propSchema._pointer);
      });

    if (this.properties.length === 1) {
      this.properties[0].expanded = true;
    }
  }

  applyStyling() {
    if (this.nestOdd) {
      this._renderer.setElementAttribute(this._elementRef.nativeElement, 'nestodd', 'true');
    }
  }

  trackByName(_: number, item: any): number {
    return item.name + (item._pointer || '');
  }

  trackByIdx(idx: number, _: any): number {
    return idx;
  }

  findDescendantWithField(fieldName: string): DescendantInfo {
    let res: DescendantInfo;
    for (let descendantInfo of this.descendants) {
      let schema = this.specMgr.getDescendant(descendantInfo, this.schema);
      this.normalizer.reset();
      schema = this.normalizer.normalize(schema, this.normPointer,
        {resolved: true});
      if (schema.properties && schema.properties[fieldName]) {
        res = descendantInfo;
        break;
      };
    };
    return res;
  }

  ensureSearchIsShown(ptr: string) {
    if (ptr.startsWith(this.absolutePointer)) {
      let props = this.properties;
      if (!props) return;
      let relative = JsonPointer.relative(this.absolutePointer, ptr);
      let propName;
      if (relative.length > 1 && relative[0] === 'properties') {
        propName = relative[1];
      }
      let prop = props.find(p => p._name === propName);
      if (!prop) {
        let d = this.findDescendantWithField(propName);
        this.selectDescendant(d);
        prop = this.properties.find(p => p._name === propName);
      }
      if (prop && !prop.isTrivial) prop.expanded = true;
      this.cdr.markForCheck();
      this.cdr.detectChanges();
    }
  }

  ngOnInit() {
    this.preinit();
  }
}