package com.ufund.api.ufundapi.controller;

import java.io.IOException;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.ufund.api.ufundapi.DuplicateKeyException;
import com.ufund.api.ufundapi.model.User;
import com.ufund.api.ufundapi.service.AuthService;
import com.ufund.api.ufundapi.service.UserService;

import static java.util.List.of;

@RestController
@RequestMapping("users")
public class UserController {
    private static final Logger LOG = Logger.getLogger(UserController.class.getName());
    private final UserService userService;
    private final AuthService authService;    

    public UserController(UserService userService, AuthService authService) {
        this.userService = userService;
        this.authService = authService;
    }

    /**
     * Creates a User with the provided object
     * @param params A map consisting of the parameters for a user
     * @return OK response and the user if it was successful, INTERNAL_SERVER_ERROR
     *         otherwise
     */
    @PostMapping("")
    public ResponseEntity<User> createUser(@RequestBody Map<String, String> params) {
        LOG.log(Level.INFO, "POST /users body={0}", params);
        String username = params.get("username");
        String password = params.get("password");

        try {
            User user = userService.createUser(username, password);
            if (user != null) {
                return new ResponseEntity<>(user, HttpStatus.CREATED);
            } else {
                return new ResponseEntity<>(HttpStatus.CONFLICT);
            }
        } catch (DuplicateKeyException ex) {
            LOG.log(Level.WARNING, ex.getLocalizedMessage());
            return new ResponseEntity<>(HttpStatus.CONFLICT);
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, ex.getLocalizedMessage());
            return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
        }
    }

    /**
     * Responds to the GET request for a {@linkplain User user} for the given id
     * 
     * @param username The name of the user
     * @param key      The authentication key of the user
     * @return ResponseEntity with {@link User user} object and HTTP status of OK if
     *         found<br>
     *         ResponseEntity with HTTP status of NOT_FOUND if not found<br>
     *         ResponseEntity with HTTP status of INTERNAL_SERVER_ERROR otherwise
     */
    @GetMapping("/{username}")
    public ResponseEntity<User> getUser(@PathVariable String username, @RequestHeader("jelly-api-key") String key) {
        LOG.log(Level.INFO, "GET /user/{0} key={1}", of(username, key));

        try {
            authService.authenticate(username, key);
            User user = userService.getUser(username);
            if (user != null) {
                return new ResponseEntity<>(user.withoutPasswordHash(), HttpStatus.OK);
            } else {
                return new ResponseEntity<>(HttpStatus.NOT_FOUND);
            }
        } catch (IllegalAccessException ex) {
            LOG.log(Level.WARNING, ex.getLocalizedMessage());
            return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, ex.getLocalizedMessage());
            return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
        }

    }

    /**
     * Updates a User with the provided one
     * 
     * @param user     The user to update
     * @param username The name of the user
     * @param key      The authentication key of the user
     * @return OK response and the user if it was successful, or
     *         INTERNAL_SERVER_ERROR if there was an issue
     */
    @PutMapping("/{username}")
    public ResponseEntity<User> updateUser(@RequestBody User user, @PathVariable String username, @RequestHeader("jelly-api-key") String key) {
        LOG.log(Level.INFO,"PUT /users/{0} body={1} key={2}", of(username, user, key));
        try {
            authService.authenticate(username, key);
            user = userService.updateUser(user, username);
            if (user != null) {
                return new ResponseEntity<>(user, HttpStatus.OK);
            } else {
                return new ResponseEntity<>(HttpStatus.NOT_FOUND);
            }
        } catch (IllegalArgumentException ex) {
            LOG.log(Level.WARNING, ex.getLocalizedMessage());
            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
        } catch (IllegalAccessException ex) {
            LOG.log(Level.WARNING, ex.getLocalizedMessage());
            return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, ex.getLocalizedMessage());
            return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
        }
    }

    /**
     * Deletes a user with the desired name
     * 
     * @param username The name of the user
     * @param key      The authentication key of the user
     * @return OK if the user was deleted, NOT_FOUND if the user was not found, or
     *         INTERNAL_SERVER_ERROR if an error occurred
     */
    @DeleteMapping("/{username}")
    public ResponseEntity<Boolean> deleteUser(@PathVariable String username, @RequestHeader("jelly-api-key") String key) {
        LOG.log(Level.INFO, "DELETE /users/{0} id={1}", of(username, key));

        try {
            authService.authenticate(username, key);
            if (userService.deleteUser(username)) {
                return new ResponseEntity<>(HttpStatus.OK);
            } else {
                return new ResponseEntity<>(HttpStatus.NOT_FOUND);
            }
        } catch (IllegalAccessException ex) {
            LOG.log(Level.WARNING, ex.getLocalizedMessage());
            return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, ex.getLocalizedMessage());
            return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
        }
    }

}