import { crawl } from "../../tools/crawl";
import { join as pathJoin } from "path";
import * as fs from "fs";
import type { ThemeType } from "../../shared/constants";
import { getThisCodebaseRootDirPath } from "../../tools/getThisCodebaseRootDirPath";

/** Assumes the theme type exists */
export function readFieldNameUsage(params: { themeSrcDirPath: string; themeType: ThemeType }): string[] {
    const { themeSrcDirPath, themeType } = params;

    const fieldNames = new Set<string>();

    for (const srcDirPath of [pathJoin(getThisCodebaseRootDirPath(), "src", themeType), pathJoin(themeSrcDirPath, themeType)]) {
        const filePaths = crawl({ "dirPath": srcDirPath, "returnedPathsType": "absolute" }).filter(filePath => /\.(ts|tsx|js|jsx)$/.test(filePath));

        for (const filePath of filePaths) {
            const rawSourceFile = fs.readFileSync(filePath).toString("utf8");

            if (!rawSourceFile.includes("messagesPerField")) {
                continue;
            }

            for (const functionName of ["printIfExists", "existsError", "get", "exists", "getFirstError"] as const) {
                if (!rawSourceFile.includes(functionName)) {
                    continue;
                }

                try {
                    rawSourceFile
                        .split(functionName)
                        .filter(part => part.startsWith("("))
                        .map(part => {
                            let [p1] = part.split(")");

                            p1 = p1.slice(1);

                            return p1;
                        })
                        .map(part => {
                            return part
                                .split(",")
                                .map(a => a.trim())
                                .filter((...[, i]) => (functionName !== "printIfExists" ? true : i === 0))
                                .filter(a => a.startsWith('"') || a.startsWith("'") || a.startsWith("`"))
                                .filter(a => a.endsWith('"') || a.endsWith("'") || a.endsWith("`"))
                                .map(a => a.slice(1).slice(0, -1));
                        })
                        .flat()
                        .forEach(fieldName => fieldNames.add(fieldName));
                } catch {}
            }
        }
    }

    return Array.from(fieldNames);
}