import 'typings-global'
let grayMatter = require('gray-matter')

export type TFrontMatter = 'yaml' | 'json'

export interface IParsedFM {
    data: any
    content: string
    orig: string
}

export interface ISmartfmContructorOptions {
    fmType: TFrontMatter
}

/**
 * class smartfm handles frontmatter
 */
export class Smartfm {
    fmType: TFrontMatter

    constructor(optionsArg: ISmartfmContructorOptions) {
        this.fmType = optionsArg.fmType
    }

    /**
     * add frontmatter to a string
     */
    stringify(bodyString: string, frontmatterData: any) {
        return stringify(bodyString, frontmatterData)
    }

    /**
     * parse a string that has frontmatter attached, YAML notation
     */
    parse(stringToParse: string): IParsedFM {
        return parse(stringToParse)
    }
}

/**
 * parse a string that has frontmatter attached, YAML notation
 */
export let parse = (stringToParse: string): IParsedFM => {
    return grayMatter(stringToParse)
}

/**
 * add frontmatter to a string
 */
export let stringify = (bodyString: string, frontmatterData: any) => {
    grayMatter.stringify(bodyString, frontmatterData)
}