package com.ufund.api.ufundapi.service;

import java.io.IOException;
import java.util.Arrays;

import com.ufund.api.ufundapi.model.Need;
import com.ufund.api.ufundapi.persistence.CupboardDAO;
import org.springframework.stereotype.Component;
import com.ufund.api.ufundapi.DuplicateKeyException;

@Component
public class CupboardService {

    private final CupboardDAO cupboardDAO;

    public CupboardService(CupboardDAO cupboardDAO) {
        this.cupboardDAO = cupboardDAO;
    }

    /**
     * Creates a new Need
     *
     * @param name The name of the need to create
     * @param maxGoal The max goal of the new need
     * @param goalType The goal type of the new need
     * @return The need that was created
     * @throws IOException Thrown if there was any issue saving the data
     * @throws DuplicateKeyException If there already exists a need with the same name
     */
    public Need createNeed(String name, int maxGoal, Need.GoalType goalType) throws IOException, DuplicateKeyException {
        
        Need need = new Need(name, goalType, maxGoal);

        if (need.getMaxGoal() <= 0) {
            throw new IllegalArgumentException("Max Goal must be greater than zero");
        } else {
            for (Need searchNeed : cupboardDAO.getNeeds()) {
                if (need.getName().equalsIgnoreCase(searchNeed.getName())) {
                    throw new DuplicateKeyException("Duplicate names are not allowed");
                }
            }
            return cupboardDAO.addNeed(need);
        }
        
    }

    /**
     * Get all the needs in the cupboard
     *
     * @return An array containing all needs
     * @throws IOException Thrown if there was any issue saving the data
     */
    public Need[] getNeeds() throws IOException {
        return cupboardDAO.getNeeds();
    }

    /**
     * Returns an array of needs filtered by a search
     *
     * @param search The search substring
     * @return The requested array
     * @throws IOException Thrown if there was any issue saving the data
     */
    public Need[] searchNeeds(String search) throws IOException {
        return Arrays.stream(cupboardDAO.getNeeds())
                .filter(i -> i.getName().toLowerCase().contains(search.toLowerCase()))
                .toArray(Need[]::new);
    }

    /**
     * Gets a need with the specified ID
     *
     * @param id the ID of the need
     * @return The resulting Need or null if the need was not found
     */
    public Need getNeed(int id) throws IOException {
        return cupboardDAO.getNeed(id);
    }

    /**
     * Updates a need
     *
     * @param id The ID of the need to update
     * @param need The need object to set (note: the ID is ignored)
     * @return The updated need object
     * @throws IOException Thrown if there was an issue saving the changes
     */
    public Need updateNeed(Need need, int id) throws IOException {
        if (need.getId() != id) {
            throw new IllegalArgumentException("ID in URL and body must match");
        }
        return cupboardDAO.updateNeed(need);
    }

    /**
     * Delete a need from the cupboard
     *
     * @param id the ID of the need
     * @return True if the need was deleted
     * @throws IOException Thrown on any problem removing the need
     */
    public boolean deleteNeed(int id) throws IOException {
        return cupboardDAO.deleteNeed(id);
    }
}