import type { HttpContext } from '@adonisjs/core/http';
import File from '#models/file';
import { StatusCodes } from 'http-status-codes';
import * as fs from 'fs';
import * as path from 'path';
import { DateTime } from 'luxon';

// node ace make:controller Author
export default class FileController {
    // @Get("download/:id")
    public async findOne({ response, params }: HttpContext) {
        const id = params.id;
        // const file = await File.findOrFail(id);
        // Load file with its related dataset to check embargo
        const file = await File.query()
            .where('id', id)
            .preload('dataset') // or 'dataset' - whatever your relationship is named
            .firstOrFail();

        if (!file) {
            return response.status(StatusCodes.NOT_FOUND).send({
                message: `Cannot find File with id=${id}.`,
            });
        }

        // Check embargo date
        const dataset = file.dataset; // or file.dataset
        if (dataset && this.isUnderEmbargo(dataset.embargo_date)) {
            return response.status(StatusCodes.FORBIDDEN).send({
                message: `File is under embargo until ${dataset.embargo_date?.toFormat('yyyy-MM-dd')}`,
            });
        }

        // Proceed with file download
        const filePath = '/storage/app/data/' + file.pathName;
        const ext = path.extname(filePath);
        const fileName = file.label + ext;

        try {
            fs.accessSync(filePath, fs.constants.R_OK); //| fs.constants.W_OK);
            // console.log("can read/write:", path);

            response
                .header('Cache-Control', 'no-cache private')
                .header('Content-Description', 'File Transfer')
                .header('Content-Type', file.mimeType)
                .header('Content-Disposition', 'inline; filename=' + fileName)
                .header('Content-Transfer-Encoding', 'binary')
                .header('Access-Control-Allow-Origin', '*')
                .header('Access-Control-Allow-Methods', 'GET,POST');

            response.status(StatusCodes.OK).download(filePath);
        } catch (err) {
            // console.log("no access:", path);
            response.status(StatusCodes.NOT_FOUND).send({
                message: `File with id ${id} doesn't exist on file server`,
            });
        }
    }

    /**
     * Check if the dataset is under embargo
     * Compares only dates (ignoring time) for embargo check
     * @param embargoDate - The embargo date from dataset
     * @returns true if under embargo, false if embargo has passed or no embargo set
     */
    private isUnderEmbargo(embargoDate: DateTime | null): boolean {
        // No embargo date set - allow download
        if (!embargoDate) {
            return false;
        }

        // Get current date at start of day (00:00:00)
        const today = DateTime.now().startOf('day');

        // Get embargo date at start of day (00:00:00)
        const embargoDateOnly = embargoDate.startOf('day');

        // File is under embargo if embargo date is after today
        // This means the embargo lifts at the start of the embargo date
        return embargoDateOnly >= today;
    }
}