<?php

namespace App;

use Carbon\Carbon;
use App\Traits\Searchable;
use App\Helpers\DateHelper;
use Illuminate\Support\Collection;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Storage;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class Contact extends Model
{
    use Searchable;

    protected $dates = [
        'birthdate',
        'last_talked_to',
    ];

    // The list of columns we want the Searchable trait to use.
    protected $searchable_columns = [
        'first_name',
        'middle_name',
        'last_name',
        'email',
        'street',
        'city',
        'postal_code',
        'province',
        'food_preferencies',
        'job',
        'company',
    ];

    // The list of columns we want the Searchable trait to select.
    protected $return_from_search = [
        'id',
        'first_name',
        'middle_name',
        'last_name',
        'has_avatar',
        'avatar_file_name',
        'gravatar_url',
        'default_avatar_color',
    ];

    /**
     * The attributes that aren't mass assignable.
     *
     * @var array
     */
    protected $guarded = ['id'];

    /**
     * Eager load account with every contact.
     */
    protected $with = [
        'account',
    ];

    /**
     * Get the user associated with the contact.
     *
     * @return BelongsTo
     */
    public function account()
    {
        return $this->belongsTo('App\Account');
    }

    /**
     * Get the activity records associated with the contact.
     *
     * @return HasMany
     */
    public function activities()
    {
        return $this->hasMany('App\Activity')->orderBy('date_it_happened', 'desc');
    }

    /**
     * Get the activity records associated with the contact.
     *
     * @return HasMany
     */
    public function activityStatistics()
    {
        return $this->hasMany('App\ActivityStatistic');
    }

    /**
     * Get the contact records associated with the contact.
     *
     * @return BelongsTo
     */
    public function country()
    {
        return $this->belongsTo('App\Country');
    }

    /**
     * Get the debt records associated with the contact.
     *
     * @return HasMany
     */
    public function debts()
    {
        return $this->hasMany('App\Debt');
    }

    /**
     * Get the gift records associated with the contact.
     *
     * @return HasMany
     */
    public function gifts()
    {
        return $this->hasMany('App\Gift');
    }

    /**
     * Get the event records associated with the contact.
     *
     * @return HasMany
     */
    public function events()
    {
        return $this->hasMany('App\Event')->orderBy('created_at', 'desc');
    }

    /**
     * Get the kid records associated with the contact.
     *
     * @return HasMany
     */
    public function kids()
    {
        return $this->hasMany('App\Kid', 'child_of_contact_id');
    }

    /**
     * Get the note records associated with the contact.
     *
     * @return HasMany
     */
    public function notes()
    {
        return $this->hasMany('App\Note');
    }

    /**
     * Get the reminder records associated with the contact.
     *
     * @return HasMany
     */
    public function reminders()
    {
        return $this->hasMany('App\Reminder')->orderBy('next_expected_date', 'asc');
    }

    /**
     * Get the current significant other associated with the contact.
     *
     * @return SignificantOther
     */
    public function significantOther()
    {
        return $this->hasOne('App\SignificantOther')->active();
    }

    /**
     * Get the significant others associated with the contact.
     *
     * @return HasMany
     */
    public function significantOthers()
    {
        return $this->hasMany('App\SignificantOther');
    }

    /**
     * Get the task records associated with the contact.
     *
     * @return HasMany
     */
    public function tasks()
    {
        return $this->hasMany('App\Task');
    }

    /**
     * Get the tags records associated with the contact.
     *
     * @return HasMany
     */
    public function tags()
    {
        return $this->belongsToMany('App\Tag')->withPivot('account_id')->withTimestamps();
    }

    /**
     * Get the calls records associated with the contact.
     *
     * @return HasMany
     */
    public function calls()
    {
        return $this->hasMany('App\Call')->orderBy('called_at', 'desc');
    }

    /**
     * Sort the contacts according a given criteria.
     * @param Builder $builder
     * @param string $criteria
     * @return Builder
     */
    public function scopeSortedBy(Builder $builder, $criteria)
    {
        switch ($criteria) {
            case 'firstnameAZ':
                return $builder->orderBy('first_name', 'asc');
            case 'firstnameZA':
                return $builder->orderBy('first_name', 'desc');
            case 'lastnameAZ':
                return $builder->orderBy('last_name', 'asc');
            case 'lastnameZA':
                return $builder->orderBy('last_name', 'desc');
            default:
                return $builder->orderBy('first_name', 'asc');
        }
    }

    /**
     * Get user's initials.
     *
     * @return string
     */
    public function getInitialsAttribute()
    {
        preg_match_all('/(?<=\s|^)[a-zA-Z0-9]/i', $this->getCompleteName(), $initials);

        return implode('', $initials[0]);
    }

    /**
     * Get the complete name of the contact.
     *
     * @return string
     */
    public function getCompleteName($nameOrder = 'firstname_first')
    {
        $completeName = '';

        if ($nameOrder == 'firstname_first') {
            $completeName = $this->first_name;

            if (! is_null($this->middle_name)) {
                $completeName = $completeName.' '.$this->middle_name;
            }

            if (! is_null($this->last_name)) {
                $completeName = $completeName.' '.$this->last_name;
            }
        } else {
            if (! is_null($this->last_name)) {
                $completeName = $this->last_name;
            }

            if (! is_null($this->middle_name)) {
                $completeName = $completeName.' '.$this->middle_name;
            }

            $completeName = $completeName.' '.$this->first_name;
        }

        return $completeName;
    }

    /**
     * Get the first name of the contact.
     *
     * @return string
     */
    public function getFirstName()
    {
        return $this->first_name;
    }

    /**
     * Get the middle name of the contact.
     *
     * @return string
     */
    public function getMiddleName()
    {
        return $this->middle_name;
    }

    /**
     * Get the last name of the contact.
     *
     * @return string
     */
    public function getLastName()
    {
        return $this->last_name;
    }

    /**
     * Get the initials of the contact, used for avatars.
     *
     * @return string
     */
    public function getInitials()
    {
        return $this->initials;
    }

    /**
     * Get the date of the last activity done by this contact.
     *
     * @return string 'Oct 29, 1981'
     */
    public function getLastActivityDate($timezone)
    {
        if ($this->activities->count() === 0) {
            return;
        }

        $lastActivity = $this->activities->sortByDesc('date_it_happened')->first();

        return DateHelper::getShortDate(
            Carbon::parse($lastActivity->date_it_happened, $timezone)
        );
    }

    /**
     * Get the last talked to date.
     *
     * @return string
     */
    public function getLastCalled($timezone)
    {
        if (is_null($this->last_talked_to)) {
            return;
        }

        return DateHelper::getShortDate(
            Carbon::parse($this->last_talked_to, $timezone)
        );
    }

    /**
     * Get the birthdate of the contact.
     *
     * @return Carbon
     */
    public function getBirthdate()
    {
        if (is_null($this->birthdate)) {
            return;
        }

        return $this->birthdate;
    }

    /**
     * Gets the age of the contact in years, or returns null if the birthdate
     * is not set.
     *
     * @return int
     */
    public function getAge()
    {
        if (is_null($this->birthdate)) {
            return;
        }

        return $this->birthdate->diffInYears(Carbon::now());
    }

    /**
     * Get the phone number as a string.
     *
     * @return string or null
     */
    public function getPhone()
    {
        if (is_null($this->phone_number)) {
            return;
        }

        return $this->phone_number;
    }

    /**
     * Get the work information as a string.
     *
     * @return string or null
     */
    public function getJob()
    {
        if (is_null($this->job)) {
            return;
        }

        return $this->job;
    }

    /**
     * Get the company the person is working at as a string.
     *
     * @return string or null
     */
    public function getCompany()
    {
        if (is_null($this->company)) {
            return;
        }

        return $this->company;
    }

    /**
     * Returns 'true' if the birthdate is an approximation.
     *
     * @return string
     */
    public function isBirthdateApproximate()
    {
        if ($this->is_birthdate_approximate === 'unknown') {
            return true;
        }

        if ($this->is_birthdate_approximate === 'exact') {
            return false;
        }

        return $this->is_birthdate_approximate;
    }

    /**
     * Get the address in a format like 'Lives in Scranton, MS'.
     *
     * @return string
     */
    public function getPartialAddress()
    {
        $address = $this->getCity();

        if (is_null($address)) {
            return;
        }

        if (! is_null($this->getProvince())) {
            $address = $address.', '.$this->getProvince();
        }

        return $address;
    }

    /**
     * Get the street of the contact.
     *
     * @return string or null
     */
    public function getStreet()
    {
        if (is_null($this->street)) {
            return;
        }

        return $this->street;
    }

    /**
     * Get the province of the contact.
     *
     * @return string or null
     */
    public function getProvince()
    {
        if (is_null($this->province)) {
            return;
        }

        return $this->province;
    }

    /**
     * Get the postal code of the contact.
     *
     * @return string or null
     */
    public function getPostalCode()
    {
        if (is_null($this->postal_code)) {
            return;
        }

        return $this->postal_code;
    }

    /**
     * Get the country of the contact.
     *
     * @return string or null
     */
    public function getCountryName()
    {
        if ($this->country) {
            return $this->country->country;
        }
    }

    /**
     * Get the city.
     *
     * @return string
     */
    public function getCity()
    {
        if (is_null($this->city)) {
            return;
        }

        return $this->city;
    }

    /**
     * Get the countryID of the contact.
     *
     * @return string or null
     */
    public function getCountryID()
    {
        return $this->country_id;
    }

    /**
     * Get the country ISO of the contact.
     *
     * @return string or null
     */
    public function getCountryISO()
    {
        if ($this->country) {
            return $this->country->iso;
        }
    }

    /**
     * Get an URL for Google Maps for the address.
     *
     * @return string
     */
    public function getGoogleMapAddress()
    {
        $address = $this->getFullAddress();
        $address = urlencode($address);

        return "https://www.google.ca/maps/place/{$address}";
    }

    /**
     * Get the total number of reminders.
     *
     * @return int
     */
    public function getNumberOfReminders()
    {
        return $this->reminders->count();
    }

    /**
     * Get the total number of kids.
     *
     * @return int
     */
    public function getNumberOfKids()
    {
        return $this->kids->count();
    }

    /**
     * Get the total number of activities.
     *
     * @return int
     */
    public function getNumberOfActivities()
    {
        return $this->activities->count();
    }

    /**
     * Get the total number of gifts, regardless of ideas or offered.
     *
     * @return int
     */
    public function getNumberOfGifts()
    {
        return $this->gifts->count();
    }

    /**
     * Gets the email address or returns null if undefined.
     *
     * @return string
     */
    public function getEmail()
    {
        if (is_null($this->email)) {
            return;
        }

        return $this->email;
    }

    /**
     * Gets the Twitter URL or returns null if undefined.
     *
     * @return string
     */
    public function getTwitter()
    {
        if (is_null($this->twitter_profile_url)) {
            return;
        }

        return $this->twitter_profile_url;
    }

    /**
     * Gets the Facebook URL or returns null if undefined.
     *
     * @return string
     */
    public function getFacebook()
    {
        if (is_null($this->facebook_profile_url)) {
            return;
        }

        return $this->facebook_profile_url;
    }

    /**
     * Gets the LinkedIn URL or returns null if undefined.
     *
     * @return string
     */
    public function getLinkedin()
    {
        if (is_null($this->linkedin_profile_url)) {
            return;
        }

        return $this->linkedin_profile_url;
    }

    /**
     * Get the current Significant Other, if it exists, or return null otherwise.
     *
     * @return SignificantOther
     */
    public function getCurrentSignificantOther()
    {
        return $this->significantOther;
    }

    /**
     * Get the notes for this contact. Return an empty collection if no notes.
     *
     * @return Note
     */
    public function getNotes()
    {
        return $this->notes;
    }

    /**
     * Get the number of notes for this contact.
     *
     * @return int
     */
    public function getNumberOfNotes()
    {
        return $this->notes->count();
    }

    /**
     * Get the kids, if any, as a collection.
     *
     * @return Collection
     */
    public function getKids()
    {
        return $this->kids;
    }

    /**
     * Gets the food preferencies or return null if not defined.
     *
     * @return string
     */
    public function getFoodPreferencies()
    {
        if (is_null($this->food_preferencies)) {
            return;
        }

        return $this->food_preferencies;
    }

    /**
     * Get the default color of the avatar if no picture is present.
     *
     * @return string
     */
    public function getAvatarColor()
    {
        return $this->default_avatar_color;
    }

    /**
     * Set the default avatar color for this object.
     *
     * @param string|null $color
     * @return void
     */
    public function setAvatarColor($color = null)
    {
        $colors = [
            '#fdb660',
            '#93521e',
            '#bd5067',
            '#b3d5fe',
            '#ff9807',
            '#709512',
            '#5f479a',
            '#e5e5cd',
        ];

        $this->default_avatar_color = $color ?? $colors[mt_rand(0, count($colors) - 1)];

        $this->save();
    }

    /**
     * Log an event in the Event table about this contact.
     *
     * @param  string $objectType Contact, Activity, Kid,...
     * @param  int $objectId ID of the object
     * @param  string $natureOfOperation 'add', 'update', 'delete'
     * @return int                          Id of the created event
     */
    public function logEvent($objectType, $objectId, $natureOfOperation)
    {
        $event = $this->events()->create([]);
        $event->account_id = $this->account_id;
        $event->object_type = $objectType;
        $event->object_id = $objectId;
        $event->nature_of_operation = $natureOfOperation;
        $event->save();

        return $event->id;
    }

    /**
     * Update the name of the contact.
     *
     * @param  string $firstName
     * @param  string $middleName
     * @param  string $lastName
     * @return bool
     */
    public function updateName($firstName, $middleName, $lastName)
    {
        if ($firstName == '') {
            return false;
        }

        $this->first_name = $firstName;

        if (! is_null($middleName)) {
            $this->middle_name = $middleName;
        }

        if (! is_null($lastName)) {
            $this->last_name = $lastName;
        }

        $this->save();

        return true;
    }

    /**
     * Update the name of the contact.
     *
     * @param  string $foodPreferencies
     * @return void
     */
    public function updateFoodPreferencies($foodPreferencies)
    {
        if ($foodPreferencies == '') {
            $this->food_preferencies = null;
        } else {
            $this->food_preferencies = $foodPreferencies;
        }

        $this->save();
    }

    /**
     * Get all the activities, if any.
     *
     * @return Collection
     */
    public function getActivities()
    {
        return $this->activities;
    }

    /**
     * Refresh statistics about activities
     * TODO: unit test.
     *
     * @return void
     */
    public function calculateActivitiesStatistics()
    {
        // Delete the Activities statistics table for this contact
        $this->activityStatistics->each->delete();

        // Create the statistics again
        $this->activities->groupBy('date_it_happened.year')
            ->map(function (Collection $activities, $year) {
                $activityStatistic = $this->activityStatistics()->create([]);
                $activityStatistic->account_id = $this->account_id;
                $activityStatistic->year = $year;
                $activityStatistic->count = $activities->count();
                $activityStatistic->save();
            });
    }

    /**
     * Get statistics for the contact
     * TODO: add unit test.
     */
    public function getActivitiesStats()
    {
        return $this->activityStatistics;
    }

    /**
     * Get all the reminders, if any.
     *
     * @return Collection
     */
    public function getReminders()
    {
        return $this->reminders;
    }

    /**
     * Get all the gifts, if any.
     *
     * @return Collection
     */
    public function getGifts()
    {
        return $this->gifts;
    }

    /**
     * Get all the gifts offered, if any.
     */
    public function getGiftsOffered()
    {
        return $this->gifts()->offered()->get();
    }

    /**
     * Get all the gift ideas, if any.
     */
    public function getGiftIdeas()
    {
        return $this->gifts()->isIdea()->get();
    }

    /**
     * Get all the tasks in the in progress state, if any.
     */
    public function getTasksInProgress()
    {
        return $this->tasks()->inProgress()->get();
    }

    /**
     * Get all the tasks no matter the state, if any.
     */
    public function getTasks()
    {
        return $this->tasks;
    }

    /**
     * Get all the tasks in the in completed state, if any.
     */
    public function getCompletedTasks()
    {
        return $this->tasks()->completed()->get();
    }

    /**
     * Returns the URL of the avatar with the given size.
     *
     * @param  int $size
     * @return string
     */
    public function getAvatarURL($size)
    {
        $original_avatar_url = Storage::disk('public')->url($this->avatar_file_name);
        $avatar_filename = pathinfo($original_avatar_url, PATHINFO_FILENAME);
        $avatar_extension = pathinfo($original_avatar_url, PATHINFO_EXTENSION);
        $resized_avatar = 'avatars/'.$avatar_filename.'_'.$size.'.'.$avatar_extension;

        return Storage::disk('public')->url($resized_avatar);
    }

    /**
     * Get the gravatar, if it exits.
     *
     * @param  int $size
     * @return string|bool
     */
    public function getGravatar($size)
    {
        if (empty($this->email)) {
            return false;
        }
        $gravatar_url = 'https://www.gravatar.com/avatar/'.md5(strtolower(trim($this->email)));
        // check if gravatar exists by appending ?d=404, returns 404 response if does not exist
        $gravatarHeaders = get_headers($gravatar_url.'?d=404');
        if ($gravatarHeaders[0] == 'HTTP/1.1 404 Not Found') {
            return false;
        }

        return $gravatar_url.'?s='.$size;
    }

    /**
     * Check if the contact has debt (by the contact or the user for this contact).
     *
     * @return bool
     */
    public function hasDebt()
    {
        return $this->debts()->count() !== 0;
    }

    /**
     * Get all the tasks no matter the state, if any.
     */
    public function getDebts()
    {
        return $this->debts;
    }

    /**
     * Get the list of tags as a string to populate the tags form.
     */
    public function getTagsAsString()
    {
        $tags = [];

        foreach ($this->tags as $tag) {
            array_push($tags, $tag->name);
        }

        return implode(',', $tags);
    }

    /**
     * Update the last called info on the contact, if the call has been made
     * in the most recent date.
     *
     * @param  Call   $call
     * @return void
     */
    public function updateLastCalledInfo(Call $call)
    {
        if (is_null($this->last_talked_to)) {
            $this->last_talked_to = $call->called_at;
        } else {
            $this->last_talked_to = $this->last_talked_to->max($call->called_at);
        }

        $this->save();
    }
}