const e = require('express');
const Token = require('markdown-it/lib/token');
const md = require("markdown-it")().disable(['link'])

const produceTranslatedChapterOutput = (translationChapter) => {
    // TODO: Check that translationChapter has all the required fields...
    return md.parse(
        translationChapter.chapter.originalText
    ).map(token => {
        if (token.content) {
            const translationChunk = translationChapter.translationChunks.find(tc => { 
                return tc.text == token.content
            })

            if (translationChunk && translationChunk.translation) {
                token.content = translationChunk.translation.text
                if (token.children.length == 1) {
                    token.children[0].content = translationChunk.translation.text
                } else {
                    const newChild = new Token(
                        "text"
                    )
                    newChild.content = translationChunk.translation.text
                    token.children = [
                        newChild
                    ]
                }
            }
        }
        
        return token
    })
}

module.exports.produceMarkdownString = (translationChapter) => {
    const tokens = produceTranslatedChapterOutput(translationChapter)

    return tokens.reduce(
        (accumulator, token, index) => {
            if (token.type == "list_item_close") {
                return accumulator 
            }

            if (token.type == "ordered_list_open" || token.type == "bullet_list_open") {
                return accumulator 
            }

            if (token.type == "bullet_list_close" || token.type == "ordered_list_close") {
                return accumulator + "\n"
            }

            if (token.type == "paragraph_close") {
                if (token.level == 0) {
                    return accumulator + "\n\n"
                } else {
                    return accumulator + "\n"
                }
                
            }

            if (token.type == "blockquote_open") {
                return accumulator + `${token.info}${token.markup} `
            }

            if (token.type == "blockquote_close") {
                // Only if the next token is a blockquote?
                if (tokens.length > (index+1) && tokens.at(index+1).type == "blockquote_open") {
                    return accumulator + `${token.info}${token.markup}\n`
                } else {
                    return accumulator + `\n`
                }
                
            }

            if (token.type == "list_item_open") {
                return accumulator + `${token.info}${token.markup} `
            }

            if (token.type == "inline") {
                return accumulator + token.content
            }

            if (token.type == "heading_open") {
                return `${accumulator}${token.markup} `
            }

            if (token.type == "heading_close") {
                return `${accumulator}\n`
            }
            
            return accumulator + token.markup
        }, 
        ""
    )
}

module.exports.produceHtml = (translationChapter) => {
    const tokens = produceTranslatedChapterOutput(translationChapter)

    return md.renderer.render(
        tokens,
        {}
    )
}