const fs = require('fs');
const path = require('path');

const module_exports = {
    name: "replace_speaker",
    type: "processor",
    displayname: "Speaker Name Replacer",
    description: "Replaces speaker placeholder names with actual names based on a mapping in HTML files",

    async function({ inputHtmlPath, speakerMappingPath }) {
        return await this.replaceNames(inputHtmlPath, speakerMappingPath);
    },

    replaceNames: async function(inputHtmlPath, speakerMappingPath) {
        try {
            const htmlContent = await fs.promises.readFile(inputHtmlPath, "utf-8");
            const mappingData = await fs.promises.readFile(speakerMappingPath, "utf-8");

            let speakerMap = {};
            try {
                const parsed = JSON.parse(mappingData);
                if (parsed.speakerId && parsed.speakerName) {
                    speakerMap[parsed.speakerId] = parsed.speakerName;
                } else {
                    Object.assign(speakerMap, parsed);
                }
            } catch (e) {
                const lines = mappingData.trim().split('\n');
                lines.forEach(line => {
                    const [placeholder, realName] = line.split(',').map(s => s.trim());
                    if (placeholder && realName) speakerMap[placeholder] = realName;
                });
            }

            let outputContent = htmlContent;
            Object.entries(speakerMap).forEach(([placeholder, realName]) => {
                const regex = new RegExp(`[\$begin:math:text$\\\\\[\]\?\$\{placeholder\}\[\\$end:math:text$\\]]?`, 'g');
                outputContent = outputContent.replace(regex, realName);
            });

            await fs.promises.writeFile(inputHtmlPath, outputContent, "utf-8");

            return inputHtmlPath;

        } catch (error) {
            console.error("Error replacing speaker names:", error);
            throw error;
        }
    }
};

module.exports = module_exports;

if (require.main === module) {
    (async () => {
        const args = process.argv.slice(2);
        if (args.length < 2) process.exit(1);

        const [inputHtmlPath, speakerMappingPath] = args;

        if (!fs.existsSync(inputHtmlPath)) process.exit(1);
        if (!fs.existsSync(speakerMappingPath)) process.exit(1);

        try {
            await module_exports.replaceNames(inputHtmlPath, speakerMappingPath);
        } catch (err) {
            process.exit(1);
        }
    })();
}