import Mustache from "mustache";
import {stripHtml} from "../../helpers";
import {getContext} from "svelte";

export function previewTitle(record) {
    const channel = getContext("channel");
    let schema = channel.schemas.find((aSchema) => aSchema.name === record.record?.schema);

    if (!schema?.titleTemplate) {
        return noTemplate(schema, record.record);
    }

    let recordData = record.record.data;
    let template = Mustache.parse(schema.titleTemplate);
    let referencePreviews = template
        .filter(segment => segment[0] === "name") // keep only template tags
        .map((segment) => segment[1]) // map to fieldNames
        .filter(fieldName => { // keep only references
            let schemaField = schema.fields.find(f => f.name === fieldName)
            return schemaField?.info.name === "reference";
        }).reduce((carry, fieldName) => {  // map to records
            let child = record._children[fieldName].find(c => c.record.id === record.record.id);
            carry[field] = previewTitle(child);
            return carry;
        }, {});
    recordData = {...recordData, ...referencePreviews}

    let render = Mustache.render(schema.titleTemplate, recordData);

    if (!render || render === "") {
        return noTemplate(schema, record.record);
    }

    return stripHtml(render.slice(0, 300));
}

function noTemplate(schema, record) {
    if (schema?.type === "files") {
        return record._file.path;
    }

    let title = stripHtml(
        record?.data[schema.fields.filter((f) => f.info.name === "text")[0]?.name]
    ).slice(0, 300);

    if (title === "") {
        return "Untitled";
    }

    return title;
}