import fs from "fs";
import path from "path";
import grabDirNames from "../../utils/backend/names/grab-dir-names";
import EJSON from "../../utils/ejson";
import { DSQL_DatabaseSchemaType } from "../../types";
import numberfy from "../../utils/numberfy";
import _ from "lodash";
import uniqueByKey from "../../utils/unique-by-key";

type Params = {
    userId?: string | number | null;
    dbId?: string | number;
    dbSlug?: string;
};

export default function grabRequiredDatabaseSchemas(
    params: Params
): DSQL_DatabaseSchemaType[] | undefined {
    const primaryDbSchema = grabPrimaryRequiredDbSchema(params);
    if (!primaryDbSchema) return undefined;

    let relatedDatabases: DSQL_DatabaseSchemaType[] = [];

    const childrenDatabases = primaryDbSchema.childrenDatabases || [];
    const childrenTables =
        primaryDbSchema.tables
            .map((tbl) => {
                return tbl.childrenTables || [];
            })
            .flat() || [];

    for (let i = 0; i < childrenDatabases.length; i++) {
        const childDb = childrenDatabases[i];
        const childDbSchema = grabPrimaryRequiredDbSchema({
            userId: params.userId,
            dbId: childDb.dbId,
        });
        if (!childDbSchema?.dbSlug) continue;
        relatedDatabases.push(childDbSchema);
    }

    for (let i = 0; i < childrenTables.length; i++) {
        const childTbl = childrenTables[i];
        const childTableDbSchema = grabPrimaryRequiredDbSchema({
            userId: params.userId,
            dbId: childTbl.dbId,
        });
        if (!childTableDbSchema?.dbSlug) continue;
        relatedDatabases.push(childTableDbSchema);
    }

    return uniqueByKey([primaryDbSchema, ...relatedDatabases], "dbFullName");
}

export function grabPrimaryRequiredDbSchema({ userId, dbId, dbSlug }: Params) {
    let finalDbId = dbId;

    if (!finalDbId && userId && dbSlug) {
        const searchedDb = findDbNameInSchemaDir({ dbName: dbSlug, userId });

        if (searchedDb?.id) {
            finalDbId = searchedDb.id;
        }
    }

    if (!finalDbId) {
        return undefined;
    }

    const { targetUserPrivateDir, oldSchemasDir } = grabDirNames({
        userId,
    });

    const finalSchemaDir = targetUserPrivateDir || oldSchemasDir;

    if (!finalSchemaDir) {
        console.log(`finalSchemaDir not found!`);
        return undefined;
    }

    if (finalDbId) {
        const dbIdSchema = path.resolve(finalSchemaDir, `${finalDbId}.json`);
        if (fs.existsSync(dbIdSchema)) {
            const dbIdSchemaObject = EJSON.parse(
                fs.readFileSync(dbIdSchema, "utf-8")
            ) as DSQL_DatabaseSchemaType | undefined;
            return dbIdSchemaObject;
        }
    }

    const dbSchemasFiles = fs.readdirSync(finalSchemaDir);

    let targetDbSchema: DSQL_DatabaseSchemaType | undefined;

    try {
        for (let i = 0; i < dbSchemasFiles.length; i++) {
            const fileOrPath = dbSchemasFiles[i];
            if (!fileOrPath.endsWith(`.json`)) continue;
            if (!fileOrPath.match(/^\d+.json/)) continue;

            const targetFileJSONPath = path.join(finalSchemaDir, fileOrPath);
            const targetSchema = EJSON.parse(
                fs.readFileSync(targetFileJSONPath, "utf-8")
            ) as DSQL_DatabaseSchemaType | undefined;

            if (targetSchema && finalDbId && targetSchema?.id == finalDbId) {
                targetDbSchema = targetSchema;
            }
        }
    } catch (error) {}

    if (targetDbSchema) {
        return targetDbSchema;
    }
    // else if ( dbFullName) {
    // let existingSchemaInMainJSON = findTargetDbSchemaFromMainSchema(
    //     dbFullName
    // );

    // const nextID = grabLatestDbSchemaID(finalSchemaDir);

    // if (existingSchemaInMainJSON) {
    //     existingSchemaInMainJSON.id = nextID;
    //     fs.writeFileSync(
    //         path.join(finalSchemaDir, `${nextID}.json`),
    //         EJSON.stringify(existingSchemaInMainJSON) || "[]"
    //     );
    //     return existingSchemaInMainJSON;
    // }
    // }

    console.log(`userSchemaDir not found!`);
    console.log(`userId`, userId);
    return undefined;
}

export function findDbNameInSchemaDir({
    userId,
    dbName,
}: {
    userId?: string | number;
    dbName?: string;
}) {
    if (!userId) {
        console.log(`userId not provided!`);
        return undefined;
    }

    if (!dbName) {
        console.log(`dbName not provided!`);
        return undefined;
    }

    const { targetUserPrivateDir } = grabDirNames({
        userId,
    });

    if (!targetUserPrivateDir) {
        console.log(`targetUserPrivateDir not found!`);
        return undefined;
    }

    const dbSchemasFiles = fs.readdirSync(targetUserPrivateDir);

    let targetDbSchema: DSQL_DatabaseSchemaType | undefined;

    try {
        for (let i = 0; i < dbSchemasFiles.length; i++) {
            const fileOrPath = dbSchemasFiles[i];
            if (!fileOrPath.endsWith(`.json`)) continue;
            if (!fileOrPath.match(/^\d+.json/)) continue;

            const targetFileJSONPath = path.join(
                targetUserPrivateDir,
                fileOrPath
            );
            const targetSchema = EJSON.parse(
                fs.readFileSync(targetFileJSONPath, "utf-8")
            ) as DSQL_DatabaseSchemaType | undefined;

            if (!targetSchema) continue;

            if (
                targetSchema.dbFullName == dbName ||
                targetSchema.dbSlug == dbName
            ) {
                targetDbSchema = targetSchema;
                return targetSchema;
            }
        }
    } catch (error) {}

    return targetDbSchema;
}

type UpdateDbSchemaParam = {
    dbSchema: DSQL_DatabaseSchemaType;
    userId?: string | number | null;
};

export function writeUpdatedDbSchema({
    dbSchema,
    userId,
}: UpdateDbSchemaParam): { success?: boolean; dbSchemaId?: string | number } {
    const { targetUserPrivateDir } = grabDirNames({
        userId,
    });

    if (!targetUserPrivateDir) {
        console.log(`user ${userId} has no targetUserPrivateDir`);
        return {};
    }

    if (dbSchema.id) {
        const dbIdSchemaPath = path.join(
            targetUserPrivateDir,
            `${dbSchema.id}.json`
        );

        fs.writeFileSync(dbIdSchemaPath, EJSON.stringify(dbSchema) || "[]");

        return { success: true };
    } else {
        const nextID = grabLatestDbSchemaID(targetUserPrivateDir);

        dbSchema.id = nextID;

        fs.writeFileSync(
            path.join(targetUserPrivateDir, `${nextID}.json`),
            EJSON.stringify(dbSchema) || "[]"
        );

        return { success: true, dbSchemaId: nextID };
    }
}

export function deleteDbSchema({ dbSchema, userId }: UpdateDbSchemaParam) {
    const { targetUserPrivateDir, userSchemaMainJSONFilePath } = grabDirNames({
        userId,
    });

    if (!targetUserPrivateDir) return;

    const targetDbSchema = grabPrimaryRequiredDbSchema({
        dbId: dbSchema.id,
        userId,
    });

    const schemaFile = path.join(
        targetUserPrivateDir,
        `${targetDbSchema?.id}.json`
    );

    try {
        fs.unlinkSync(schemaFile);
    } catch (error) {}

    if (
        userSchemaMainJSONFilePath &&
        fs.existsSync(userSchemaMainJSONFilePath)
    ) {
        try {
            let allDbSchemas = EJSON.parse(
                fs.readFileSync(userSchemaMainJSONFilePath, "utf-8")
            ) as DSQL_DatabaseSchemaType[] | undefined;

            if (allDbSchemas?.[0]) {
                for (let i = 0; i < allDbSchemas.length; i++) {
                    const dbSch = allDbSchemas[i];
                    if (
                        dbSch.dbFullName == dbSchema.dbFullName ||
                        dbSch.id == dbSchema.id
                    ) {
                        allDbSchemas.splice(i, 1);
                    }
                }

                fs.writeFileSync(
                    userSchemaMainJSONFilePath,
                    EJSON.stringify(allDbSchemas) || "[]"
                );
            }
        } catch (error) {}
    }
}

export function findTargetDbSchemaFromMainSchema(
    schemas: DSQL_DatabaseSchemaType[],
    dbFullName?: string,
    dbId?: string | number
): DSQL_DatabaseSchemaType | undefined {
    const targetDbSchema = schemas.find(
        (sch) => sch.dbFullName == dbFullName || (dbId && sch.id == dbId)
    );
    return targetDbSchema;
}

export function grabLatestDbSchemaID(userSchemaDir: string) {
    const dbSchemasFiles = fs.readdirSync(userSchemaDir);
    const dbNumbers = dbSchemasFiles
        .filter((dbSch) => {
            if (!dbSch.endsWith(`.json`)) return false;
            if (dbSch.match(/^\d+\.json/)) return true;
            return false;
        })
        .map((dbSch) => numberfy(dbSch.replace(/[^0-9]/g, "")));

    if (dbNumbers[0])
        return (
            (dbNumbers
                .sort((a, b) => {
                    return a - b;
                })
                .pop() || 0) + 1
        );
    return 1;
}