import {Component, Output, EventEmitter, OnInit} from 'angular2/core';

import {QueryService} from './query.service';
import {QueryMode} from './query-mode';
import {QueryStep} from './query-step';
import {QueryState} from './query-state';


@Component({
    selector: 'query-select',
    template: `
<div>
    <form (ngSubmit)="onSubmit()">
        <select (change)="onSelectMode($event)">
            <option></option>
            <option *ngFor="#mode of queryModes" [value]="mode.id">
                {{mode.label}}
            </option>
        </select>

        <span *ngIf="selectedMode.id=='type_is' || selectedMode.id=='relation_is'">
            <select *ngIf="queryOptions" [(ngModel)]="selectedOption" (change)="onSelectOption($event)">
                <option></option>
                <option *ngFor="#option of queryOptions" [value]="option">
                    {{option}}
                </option>
            </select>
        </span>

        <span *ngIf="selectedMode.id=='att_contains' || selectedMode.id=='att_contains_norm'">
            <select [(ngModel)]="selectedOption">
                <option></option>
                <option *ngFor="#option of queryOptions" [value]="option">
                    {{option}}
                </option>
            </select>
            <span>contains</span>
            <input type="text" [(ngModel)]="queryInput"/>
        </span>
        <button type="submit">Submit</button>
    </form>
</div>
        `,
    inputs: ['index']
    //outputs: ['queryChanged'] // this should work but doesn't
})
   
export class QuerySelectComponent implements OnInit { 
    public queryStep: QueryStep;
    public index: number;
    public queryModes: QueryMode[];
    public selectedMode: QueryMode;
    public queryOptions: string[];
    public selectedOption: string;
    public queryInput: string;
    
    @Output('queryChanged') queryChanged = new EventEmitter<QueryState>();
    
    constructor(private _queryService: QueryService) {}
    
    ngOnInit() {
        this.setup();
    }
    
    setup() {
        console.log("query-select setup step=", this.queryStep);
        this.queryModes = this._queryService.getQueryModes();
        // select first mode (too early?)
        this.selectedMode = this.queryModes[0];
        this.query2Options = this._queryService.getQueryOptions(this.selectedMode);
    }
    
    onSelectMode(event: any) {
        var selected = event.target.value;
        this.selectedMode = this.queryModes.find(mode => mode.id === selected);
        this.queryOptions = this._queryService.getQueryOptions(this.selectedMode);
    }
    
    onSelectOption(event: any) {
        var selected = event.target.value;
        console.debug("selected option:", selected);
        this.selectedOption = selected;
        this.onSubmit();
    }
    
    onSubmit() {
        console.debug("Submit! selectedMode=", this.selectedMode, " selectedOption=", this.selectedOption, " queryInput=", this.queryInput);
        var step: QueryStep;
        if (this.selectedMode.id == 'type_is') {
            var opt = this.selectedOption;
            if (opt) {
                step = {'mode': this.selectedMode, 'objectType': opt};
           }
        } else if (this.selectedMode.id == 'relation_is') {
            var opt = this.selectedOption;
            if (opt) {
                step = {'mode': this.selectedMode, 'relationType': opt};
           }
        } else if (this.selectedMode.id == 'att_contains' || this.selectedMode.id == 'att_contains_norm') {
            var att = this.selectedOption;
            var val = this.queryInput;
            if (att && val) {
                step = {'mode': this.selectedMode, 'attribute': att, 'value': val};
           }
        }

        if (step != null) {
            this._queryService.setQueryStep(this.index, step);
            this.queryChanged.emit(this._queryService.getState());
        }
    }
}