import { Request, Response } from 'express';
import { prisma, __path, log } from '../../../index.js';
import { contactType } from '@prisma/client';

// Get storageUnit.
function get(req: Request, res: Response) {
	if (req.query.getAll === undefined) {
		// Check if required fields are present.
		if (!req.query.id) {
			res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
			return;
		}
		prisma.storageUnit
			.findUnique({
				where: {
					id: parseInt(req.query.id.toString())
				},
				// Get contactInfo and StorageLocation from relation.
				include: {
					contactInfo: true,
					StorageLocation: true
				}
			})
			.then((items) => {
				if (items) {
					res.status(200).json(JSON.stringify(items));
				} else {
					res.status(410).json({ error: 'it seems that there is no storageUnit present.' });
				}
			})
			.catch((err) => {
				console.error(err);
				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
			});
	} else {
		prisma.storageUnit
			.findMany({
				// Get contactInfo and StorageLocation from relation.
				include: {
					contactInfo: true,
					StorageLocation: true
				}
			})
			.then((items) => {
				if (items) {
					res.status(200).json(JSON.stringify(items));
				} else {
					res.status(410).json({ error: 'storageUnit does not exist.' });
				}
			})
			.catch((err) => {
				console.error(err);
				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
			});
	}
}

// Create storageUnit.
function post(req: Request, res: Response) {
	// If the frontend wants to create a StorageUnit with non-existing ContactInfo.
	if (req.body.locationId === 'META_CREATENEW') {
		// Check if required fields are present.
		if (!req.body.street || !req.body.houseNumber || !req.body.zipCode || !req.body.city || !req.body.country || !req.body.name) {
			res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
			return;
		}

		// Create storageUnit and location.
		prisma.storageUnit
			.create({
				data: {
					name: req.body.name,
					contactInfo: {
						create: {
							type: contactType.storageUnit,
							street: req.body.street,
							houseNumber: req.body.houseNumber,
							zipCode: req.body.zipCode,
							city: req.body.city,
							country: req.body.country
						}
					}
				},
				select: {
					id: true
				}
			})
			.then((data) => {
				res.status(201).json({ status: 'created', id: data.id });
			})
			.catch((err) => {
				// Check if an entry already exists.
				if (err.code === 'P2002') {
					// P2002 -> "Unique constraint failed on the {constraint}"
					// https://www.prisma.io/docs/reference/api-reference/error-reference
					res.status(409).json({ error: 'storageUnit already exists.' });
				} else {
					log.db.error(err);
					res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
				}
			});
	} else {
		// Check if required fields are present.
		if (!req.body.name || !req.body.locationId) {
			res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
			return;
		}
		// Create storageUnit with existing location.
		prisma.storageUnit
			.create({
				data: {
					name: req.body.name,
					contactInfo: {
						connect: {
							id: parseInt(req.body.locationId)
						}
					}
				},
				select: {
					id: true
				}
			})
			.then((data) => {
				res.status(201).json({ status: 'created', id: data.id });
			})
			.catch((err) => {
				// Check if an entry already exists.
				if (err.code === 'P2002') {
					// P2002 -> "Unique constraint failed on the {constraint}"
					// https://www.prisma.io/docs/reference/api-reference/error-reference
					res.status(409).json({ error: 'storageUnit already exists.' });
				} else {
					log.db.error(err);
					res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
				}
			});
	}
}

// Update storageUnit. -> Only existing contactInfo.
async function patch(req: Request, res: Response) {
	// Check if required fields are present.
	if (!req.body.id || !req.body.name || !req.body.locationId) {
		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
		return;
	}

	// Check if the storageUnit id exists. If not return 410 Gone.
	try {
		const result = await prisma.storageUnit.findUnique({
			where: {
				id: parseInt(req.body.id)
			}
		});

		if (result === null) {
			res.status(410).json({ error: 'storageUnit does not exist.' });
			return;
		}
	} catch (err) {
		log.db.error(err);
		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
	}

	// Check if the locationId(contactInfo) exists. If not return 410 Gone.
	try {
		const result = await prisma.contactInfo.findUnique({
			where: {
				id: parseInt(req.body.locationId)
			}
		});

		if (result === null) {
			res.status(410).json({ error: 'locationId does not exist.' });
			return;
		}
	} catch (err) {
		log.db.error(err);
		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
	}

	prisma.storageUnit
		.update({
			where: {
				id: parseInt(req.body.id)
			},
			data: {
				name: req.body.name,
				contactInfo: {
					connect: {
						id: parseInt(req.body.locationId)
					}
				}
			}
		})
		.then(() => {
			res.status(201).json({ status: 'updated' });
		})
		.catch((err) => {
			// Check if an entry already exists.
			if (err.code === 'P2002') {
				// P2002 -> "Unique constraint failed on the {constraint}"
				// https://www.prisma.io/docs/reference/api-reference/error-reference
				res.status(409).json({ error: 'storageUnit already exists.' });
			} else {
				log.db.error(err);
				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
			}
		});
}

// Delete storageUnit.
async function del(req: Request, res: Response) {
	// Check if required fields are present.
	if (!req.body.id) {
		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
		return;
	}

	// Does the id exist? If not return 410 Gone.
	try {
		const result = await prisma.storageUnit.findUnique({
			where: {
				id: parseInt(req.body.id)
			}
		});

		if (result === null) {
			res.status(410).json({ error: 'storageUnit does not exist.' });
			return;
		}
	} catch (err) {
		log.db.error(err);
		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
	}

	prisma.storageUnit
		.delete({
			where: {
				id: parseInt(req.body.id)
			}
		})
		.then(() => {
			res.status(200).json({ status: 'deleted' });
		})
		.catch((err) => {
			log.db.error(err);
			res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
		});
}

export default { get, post, patch, del };