/// <reference path="../../typings/globals/jquery/index.d.ts" />
/// <reference path="../../typings/globals/mathjs/index.d.ts" />
import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import { Section, Reference } from '../libs/Reference';

@Injectable()
export class BibleService
{
    chapters: BiblePassage[];
    result: BiblePassageResult;
    count = 0;
    $: any;

    constructor(private http: Http)
    {
    }

    getResultAsPromise(section: Section): Promise<BiblePassageResult>
    {
        return new Promise((resolve) => { resolve(this.getResult(section)); });
    }

    getResult(section: Section): BiblePassageResult
    {
        try
        {
            const self = this;
            this.chapters = []; // the verses from the chapter.
            this.result = {
                cs: [],
                testament: '',
                ref: Reference.toString(section),
                status: 0,
                msg: ':)'
        };

            if (Number(section.start.chapter) > section.start.book.last_chapter)
            {
                self.result.status = -1;
                self.result.msg = 'The requested chapter for ' + section.start.book.name + ' is out of range.  Please pick a chapter between 1 and ' + section.start.book.last_chapter + '.';
                return self.result;
            }

            if (Number(section.end.chapter) > section.end.book.last_chapter)
            {
                self.result.status = -1;
                self.result.msg = 'The requested chapter for ' + section.end.book.name + ' is out of range.  Please pick a chapter between 1 and ' + section.end.book.last_chapter + '.';
                return self.result;
            }

            this.count = Number(section.end.chapter) - Number(section.start.chapter) + 1;

            for (let i = Number(section.start.chapter); i <= Number(section.end.chapter); i++)
            {
                const url = 'data/bibles/kjv_strongs/' + section.start.book.book_number + '-' + i + '.json';

                $.ajax({
                    async: false,
                    type: 'GET',
                    url: url,
                    dataType: 'json',
                    success(d: BiblePassage)
                    {
                        self.chapters.push(d);
                    },
                    error()
                    {
                        self.result.status = -1;
                        self.result.msg = 'Unable to retrieve bible passage ' + self.result.ref + '.';
                    }
                });
            }

            if (self.result.status === -1)
                return self.result;

            for (let j = 0; j < this.chapters.length; j++)
            {
                const vss: BibleVerse[] = [];
                let start: number;
                let end;

                // figure out the start verse.
                if (j === 0)
                {
                    if (section.start.verse.indexOf('*') !== -1) // you sometimes use this as a shortcut to the last verse
                    {
                        // replace the * with the last verse, then eval the expression.
                        section.start.verse = section.start.verse.replace('*', (this.chapters[j].vss.length).toString());
                        
                        start = math.eval(section.start.verse);

                        // update the section and the ref.
                        section.start.verse = start.toString();
                        this.result.ref = Reference.toString(section);
                    }
                    else
                        start = parseInt(section.start.verse);
                }
                else
                    start = 1;

                // figure out the end verse
                if ((j + 1) === this.chapters.length)
                    end = section.end.verse;
                else
                    end = '*';

                // get the verses requested.
                const tvs = this.chapters[j].vss.length;
                if (end === '*' || parseInt(end) > tvs)
                    end = tvs;

                // we're using c based indexes here, so the index is 1 less than the verse #.
                for (let i = start; i <= end; i++)
                    vss.push(this.chapters[j].vss[i - 1]);

                this.result.cs.push({
                    ch: this.chapters[j].ch,
                    vss: vss
                });
            }


            if (section.start.book.book_number >= 40)
                this.result.testament = 'new';
            else
                this.result.testament = 'old';

            return this.result;
        }
        catch (error)
        {
            console.log(error);
        }
        return null;
    }
}

export type BiblePassageResult = {
    cs: BiblePassage[],
    testament: string,
    ref: string,
    status: number,
    msg: string,
}

type BiblePassage = {
    ch: number,
    vss: BibleVerse[],
}

type BibleVerse = {
    v: number,
    w: [
        {
            t: string, s: string,
        }
    ],
}