import {Container} from "../../di"
import {Cache} from "../../util"
import {CacheModel} from "./CacheModel"

/**
 * A cache driver whose records are stored in a database table using the CacheModel.
 */
export class ORMCache extends Cache {
    public async fetch(key: string): Promise<string | undefined> {
        const model = await CacheModel.query<CacheModel>()
            .where(CacheModel.qualifyKey(), '=', key)
            .where(CacheModel.propertyToColumn('cacheExpires'), '>', new Date())
            .first()

        if ( model ) {
            return model.cacheValue
        }
    }

    public async put(key: string, value: string, expires?: Date): Promise<void> {
        let model = await CacheModel.findByKey<CacheModel>(key)
        if ( !model ) {
            model = <CacheModel> Container.getContainer().make(CacheModel)
        }

        model.cacheKey = key
        model.cacheValue = value
        model.cacheExpires = expires

        await model.save()
    }

    public async has(key: string): Promise<boolean> {
        return CacheModel.query()
            .where(CacheModel.qualifyKey(), '=', key)
            .where(CacheModel.propertyToColumn('cacheExpires'), '>', new Date())
            .exists()
    }

    public async drop(key: string): Promise<void> {
        await CacheModel.query()
            .where(CacheModel.qualifyKey(), '=', key)
            .delete()
    }
}