import {NextResponse} from "next/server";
import {Body} from "./route";
import {isUuidv4} from "@/utils/verify-uuid";
import {getFileUrlPresignedLocal, getFileUrlPreSignedS3Action} from "@/features/upload/private/upload.action";
import {Agent} from "@/db/schema/08_agent";
import {Database} from "@/db/schema/07_database";
import * as drizzleDb from "@/db";
import {db as dbClient} from "@/db";
import {and, eq} from "drizzle-orm";
import {EDbmsSchema} from "@/db/schema/types";
import {ServerActionResult} from "@/types/action-type";
import {SafeActionResult} from "next-safe-action";
import {ZodString} from "zod";
import {withUpdatedAt} from "@/db/utils";

export async function handleDatabases(body: Body, agent: Agent, lastContact: Date) {
    const databasesResponse = [];

    const formatDatabase = (database: Database, backupAction: boolean, restoreAction: boolean, UrlBackup: string) => ({
        generatedId: database.agentDatabaseId,
        dbms: database.dbms,
        data: {
            backup: {
                action: backupAction,
                cron: database.backupPolicy,
            },
            restore: {
                action: restoreAction,
                file: UrlBackup,
            },
        },
    });

    for (const db of body.databases) {

        const existingDatabase = await dbClient.query.database.findFirst({
            where: eq(drizzleDb.schemas.database.agentDatabaseId, db.generatedId)
        });

        let backupAction: boolean = false
        let restoreAction: boolean = false
        let urlBackup: string = ""

        if (!existingDatabase) {
            if (!isUuidv4(db.generatedId)) {
                return NextResponse.json(
                    {error: "generatedId is not a valid uuid"},
                    {status: 500}
                );
            }
            const [databaseCreated] = await dbClient
                .insert(drizzleDb.schemas.database)
                .values({
                    agentId: agent.id,
                    name: db.name,
                    dbms: db.dbms as EDbmsSchema,
                    agentDatabaseId: db.generatedId,
                    lastContact: lastContact,
                })
                .returning();

            if (databaseCreated) {
                databasesResponse.push(formatDatabase(databaseCreated, backupAction, restoreAction, urlBackup));
            }
        } else {

            const [databaseUpdated] = await dbClient
                .update(drizzleDb.schemas.database)
                .set(withUpdatedAt({
                    name: db.name,
                    agentId: agent.id,
                    lastContact: lastContact
                }))
                .where(eq(drizzleDb.schemas.database.id, existingDatabase.id))
                .returning();


            const backup = await dbClient.query.backup.findFirst({
                where: and(eq(drizzleDb.schemas.backup.databaseId, databaseUpdated.id), eq(drizzleDb.schemas.backup.status, "waiting"))
            })


            const restoration = await dbClient.query.restoration.findFirst({
                where: and(eq(drizzleDb.schemas.restoration.databaseId, databaseUpdated.id), eq(drizzleDb.schemas.restoration.status, "waiting"))
            })


            if (backup) {
                backupAction = true

                await dbClient
                    .update(drizzleDb.schemas.backup)
                    .set(withUpdatedAt({status: "ongoing"}))
                    .where(eq(drizzleDb.schemas.backup.id, backup.id));
            }

            if (restoration) {
                restoreAction = true


                const backupToRestore = await dbClient.query.backup.findFirst({
                    where: eq(drizzleDb.schemas.backup.id, restoration.backupId),
                    with: {
                        database: {
                            with: {
                                project: true
                            }
                        }
                    }
                })

                const [settings] = await dbClient.select().from(drizzleDb.schemas.setting).where(eq(drizzleDb.schemas.setting.name, "system")).limit(1);
                if (!settings) {
                    return NextResponse.json(
                        {error: "Unable to find settings"},
                        {status: 500}
                    );
                }


                const fileName = backupToRestore?.file

                let data: SafeActionResult<string, ZodString, readonly [], {
                    _errors?: string[] | undefined;
                }, readonly [], ServerActionResult<string>, object> | undefined

                try {

                    if (settings.storage == "local") {
                        data = await getFileUrlPresignedLocal({fileName: fileName!})
                    } else if (settings.storage == "s3") {

                        data = await getFileUrlPreSignedS3Action(`backups/${backupToRestore?.database.project?.slug}/${fileName}`);
                    }

                    if (data?.data?.success) {
                        urlBackup = data.data.value ?? "";
                    } else {
                        await dbClient
                            .update(drizzleDb.schemas.restoration)
                            .set({status: "failed"})
                            .where(eq(drizzleDb.schemas.restoration.id, restoration.id));

                        // @ts-ignore
                        const errorMessage = data?.data?.actionError?.message || "Failed to get presigned URL";
                        console.error("Restoration failed: ", errorMessage);

                        continue;
                    }
                } catch (err) {
                    console.error("Restoration crashed unexpectedly:", err);
                    await dbClient
                        .update(drizzleDb.schemas.restoration)
                        .set({status: "failed"})
                        .where(eq(drizzleDb.schemas.restoration.id, restoration.id));

                    continue;
                }
                await dbClient
                    .update(drizzleDb.schemas.restoration)
                    .set({status: "ongoing"})
                    .where(eq(drizzleDb.schemas.restoration.id, restoration.id));
            }
            databasesResponse.push(formatDatabase(databaseUpdated, backupAction, restoreAction, urlBackup));
        }
    }
    return databasesResponse;
}