<?php

namespace App\Services\Office365;

use App\Mail\Error;
use App\Models\Blocker;
use App\Models\MasterTask;
use App\Models\Project;
use App\Models\SubTask;
use App\Models\User;
use Carbon\Carbon;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Mail;

class Office365Service
{
    public static function getCalendarEvents()
    {
        $token   = self::getAccessToken();
        $groupId = env('OFFICE365_GROUP_ID');

        $response = Http::withToken($token)->get("https://graph.microsoft.com/v1.0/groups/$groupId/events");

        return $response->json()['value'];
    }

    private static function getAccessToken()
    {
        $tenantId     = env('MICROSOFT_TENANT_ID');
        $clientId     = env('MICROSOFT_CLIENT_ID');
        $clientSecret = env('MICROSOFT_CLIENT_SECRET');
        $username     = env('MICROSOFT_USERNAME');
        $password     = env('MICROSOFT_PASSWORD');

        $response = Http::asForm()->post("https://login.microsoftonline.com/{$tenantId}/oauth2/v2.0/token", [
            'grant_type'    => 'password',
            'client_id'     => $clientId,
            'client_secret' => $clientSecret,
            'username'      => $username,
            'password'      => $password,
            'scope'         => 'https://graph.microsoft.com/.default',
        ]);

        if ($response->failed()) {
            throw new \Exception('Failed to obtain access token: ' . $response->body());
        }

        return $response->json()['access_token'];
    }

    public static function addBlockers(mixed $blockers_from_office365)
    {
        // get only new events - the ones that doesnt have any office365_id in blockers table and only events that doesnt have isCancelled => true

        $newBlockers = array_filter($blockers_from_office365, function ($event) {
            return ! Blocker::where('office365_id', $event['id'])->exists() && ! $event['isCancelled'];
        });

        foreach ($newBlockers as $blocker) {
            try {
                self::addBlocker($blocker);
            } catch (\Exception $e) {
                // log error
                Mail::to('feher@studiotem.com')->send(new Error($e));
                \Log::error($e->getMessage());
            }
        }
    }

    private static function addBlocker(mixed $blocker)
    {
        $attendees = $blocker['attendees'];

        // pre kazdeho cloveka z eventu, ktory je zaroven userom v TM vytvorime blocker
        foreach ($attendees as $attendee) {
            $user = User::where('email', $attendee['emailAddress']['address'])->first();

            if ( ! $user) {
                continue;
            }

            $blockerToInsert = [];

            $blockerToInsert['office365_id']         = $blocker['id'];
            $blockerToInsert['office365_change_key'] = $blocker['changeKey'];
            $blockerToInsert['user_id']              = $user->id;
            $blockerToInsert['name']                 = $blocker['subject'];
            $blockerToInsert['type']                 = "office365_blocker";
            $blockerToInsert['start']                = Carbon::parse($blocker['start']['dateTime'])->setTimezone('Europe/Bratislava');
            $blockerToInsert['end']                  = Carbon::parse($blocker['end']['dateTime'])->setTimezone('Europe/Bratislava');
            $blockerToInsert['approved']             = 1;
            $blockerToInsert['created_at']           = Carbon::now()->toDateTimeString();
            $blockerToInsert['updated_at']           = Carbon::now()->toDateTimeString();

            Blocker::insert($blockerToInsert);
        }
    }

    /**
     * @param  mixed  $events
     *
     * @return mixed
     */
    public static function getBlockers_from_office_365_events(mixed $events): mixed
    {
        return array_filter($events, function ($event) {
            $projectCode = explode(' ', $event['subject'])[0];

            // if project code doesnt exist in database, then it is blocker
            return ! Project::where('code', $projectCode)->exists();
        });
    }

    public static function editBlockers(mixed $blockers_from_office365)
    {
        // get edited blockers - the ones, that has different changeKey from our database
        $editedBlockers = array_filter($blockers_from_office365, function ($event) {
            $blocker = Blocker::where('office365_id', $event['id'])->first();

            return $blocker && $blocker->office365_change_key !== $event['changeKey'];
        });

        foreach ($editedBlockers as $editedBlocker) {
            try {
                self::editBlocker($editedBlocker);
            } catch (\Exception $e) {
                // log error
                Mail::to('feher@studiotem.com')->send(new Error($e));
                \Log::error($e->getMessage());
            }
        }
    }

    private static function editBlocker(mixed $editedBlocker)
    {
        $attendees = $editedBlocker['attendees'];

        // ak sa v nasej DB pod blockerom nachadza nejaky user, ktory sa uz nenachadza medzi attendees, tak mu tento blocker vymazeme
        $blockersToDelete = Blocker::where('office365_id', $editedBlocker['id'])->get()->filter(function ($blocker) use
        (
            $attendees
        ) {
            $event = collect($attendees)->firstWhere('emailAddress.address', $blocker->user->email);

            return ! $event;
        });

        foreach ($blockersToDelete as $blocker) {
            $blocker->delete();
        }


        // pre kazdeho cloveka z eventu, ktory je zaroven userom v TM updatneme blocker
        foreach ($attendees as $attendee) {
            $user = User::where('email', $attendee['emailAddress']['address'])->first();

            if ( ! $user) {
                continue;
            }

            $blocker = Blocker::where('office365_id', $editedBlocker['id'])->where('user_id', $user->id)->first();

            // ak sa nenachadza blocker, znamena to, ze je to novy user medzi attendees, ktory este nema u nas vytvoreny blocker. tak ho vytvorime
            if ( ! $blocker) {
                Blocker::create([
                        'office365_id'         => $editedBlocker['id'],
                        'office365_change_key' => $editedBlocker['changeKey'],
                        'user_id'              => $user->id,
                        'name'                 => $editedBlocker['subject'],
                        'type'                 => "office365_blocker",
                        'start'                => Carbon::parse($editedBlocker['start']['dateTime'])->setTimezone('Europe/Bratislava'),
                        'end'                  => Carbon::parse($editedBlocker['end']['dateTime'])->setTimezone('Europe/Bratislava'),
                        'approved'             => 1,
                        'created_at'           => Carbon::now()->toDateTimeString(),
                        'updated_at'           => Carbon::now()->toDateTimeString()
                    ]
                );
            } else {
                $blocker->update([
                    'office365_change_key' => $editedBlocker['changeKey'],
                    'name'                 => $editedBlocker['subject'],
                    'start'                => Carbon::parse($editedBlocker['start']['dateTime'])->setTimezone('Europe/Bratislava'),
                    'end'                  => Carbon::parse($editedBlocker['end']['dateTime'])->setTimezone('Europe/Bratislava'),
                    'updated_at'           => Carbon::now()->toDateTimeString(),
                ]);
            }
        }
    }

    public static function addSubtasks(mixed $subtasks_from_office365)
    {
        $newSubtasks = array_filter($subtasks_from_office365, function ($event) {
            return ! SubTask::where('office365_id', $event['id'])->exists() && ! $event['isCancelled'];
        });

        foreach ($newSubtasks as $newSubtask) {
            try {
                $project = Project::where('code', explode(' ', $newSubtask['subject'])[0])->first();

                // ak existuje viac master taskov, pouzijeme posledny
                $mastertask = MasterTask::where('project_id', $project->id)->latest()->first();

                // ak neexistuje master task k danemu projektu, tak sa subtask neprida
                if ( ! $mastertask) {
                    continue;
                }

                self::addSubtask($newSubtask, $mastertask);
            } catch (\Exception $e) {
                // log error
                Mail::to('feher@studiotem.com')->send(new Error($e));
                \Log::error($e->getMessage());
            }
        }
    }

    private static function addSubtask(mixed $newSubtask, mixed $mastertask)
    {
        $attendees = $newSubtask['attendees'];

        $subtasksToInsert = [];
        $i                = 0;

        // pre kazdeho cloveka z eventu, ktory je zaroven userom v TM vytvorime subtask
        foreach ($attendees as $attendee) {
            $user    = User::where('email', $attendee['emailAddress']['address'])->first();
            $creator = User::where('email', $newSubtask['organizer']['emailAddress']['address'])->first();

            if ( ! $user || ! $creator) {
                continue;
            }

            $subtasksToInsert[$i]['user_id'] = $user->id;

            // vymazem prve slovo z title, ktore je project code. ak title ma len 1 slovo (project code), tak sa ako title vlozi "No title"
            $subtasksToInsert[$i]['title'] = ( ! str_contains($newSubtask['subject'],
                ' ')) ? 'No title' : substr($newSubtask['subject'],
                strpos($newSubtask['subject'], ' ') + 1);


            // estimated_time je rozdiel medzi end.dateTime a start.dateTime zakhruhleny na najblizsiu 0.5 hodinu
            $subtasksToInsert[$i]['estimated_time']       = round((strtotime($newSubtask['end']['dateTime']) - strtotime($newSubtask['start']['dateTime'])) / 3600,
                1);
            $subtasksToInsert[$i]['tracked_time']         = 0;
            $subtasksToInsert[$i]['created_by']           = $creator->id;
            $subtasksToInsert[$i]['office365_id']         = $newSubtask['id'];
            $subtasksToInsert[$i]['office365_change_key'] = $newSubtask['changeKey'];
            $subtasksToInsert[$i]['type']                 = 'office365';
            $subtasksToInsert[$i]['description']          = $newSubtask['body']['content'];
            $subtasksToInsert[$i]['deadline']             = Carbon::parse($newSubtask['end']['dateTime'])->setTimezone('Europe/Bratislava');
            $subtasksToInsert[$i]['office365_location']   = $newSubtask['location']['displayName'];
            $subtasksToInsert[$i++]['is_finished']        = 0;
        }

        $subtasks = $mastertask->subtasks()->createMany($subtasksToInsert);

        // vytvorenie timeblocks
        foreach ($subtasks as $subtask) {
            $subtask->syncTimeblocks([
                [
                    'sub_task_id' => $subtask->id,
                    'start'       => Carbon::parse($newSubtask['start']['dateTime'])->setTimezone('Europe/Bratislava'),
                    'end'         => Carbon::parse($newSubtask['end']['dateTime'])->setTimezone('Europe/Bratislava'),
                    'is_finished' => 0,
                ]
            ]);
        }

        // manualne musim trigernut tuto operaciu, lebo cez Observer sa to nespusti - ten je nastaveny len na update subtasku
        $mastertask->recalculateEstimatedTime();
    }

    /**
     * @param  mixed  $events
     *
     * @return mixed
     */
    public static function getSubtasks_from_office_365_events(mixed $events): mixed
    {
        return array_filter($events, function ($event) {
            $projectCode = explode(' ', $event['subject'])[0];

            // if project code exist in database, then it is subtask
            return Project::where('code', $projectCode)->exists();
        });
    }

    public static function editSubtasks(mixed $subtasks_from_office365)
    {
        // get edited subtasks - the ones, that has different changeKey from our database
        $editedSubtasks = array_filter($subtasks_from_office365, function ($event) {
            $subtask = SubTask::where('office365_id', $event['id'])->first();

            return $subtask && $subtask->office365_change_key !== $event['changeKey'];
        });

        foreach ($editedSubtasks as $editedSubtask) {
            try {
                self::editSubtask($editedSubtask);
            } catch (\Exception $e) {
                Mail::to('feher@studiotem.com')->send(new Error($e));
                \Log::error($e->getMessage());
            }
        }
    }

    private static function editSubtask(mixed $editedSubtask)
    {
        $attendees = $editedSubtask['attendees'];

        // vrati subtasky pre userov, ktori sa uz nenachadzaju v evente, ale v nasej databaze tento subtask maju. ale iba v pripade, ak ich subtasky este nie su ukoncene (is_finished != 1)
        $subtasksToDelete = self::getSubtasksToDeleteFromEditedEvents($editedSubtask['id'], $attendees);

        foreach ($subtasksToDelete as $subtaskToDelete) {
            self::removeSubtask($subtaskToDelete);
        }

        // novym ucastnikom sa klasicky vytvori subtask ako v pripade noveho subtasku. pre 1 subtask existuje iba 1 user.
        self::createNewSubtaskToNewAttendee($attendees, $editedSubtask);

        // existujucim ucastnikom sa updatne subtask
        foreach ($attendees as $attendee) {
            $idOfUserFromOffice365 = User::where('email', $attendee['emailAddress']['address'])->first();

            // if user doesnt exist in our database, we skip it
            if ( ! $idOfUserFromOffice365) {
                continue;
            }

            $subtask = SubTask::where('office365_id', $editedSubtask['id'])->where('user_id',
                $idOfUserFromOffice365->id)->first();

            if ( ! $subtask) {
                continue;
            }

            $subtask->update([
                'office365_change_key' => $editedSubtask['changeKey'],
                'title'                => substr($editedSubtask['subject'], strpos($editedSubtask['subject'], ' ') + 1),
                'estimated_time'       => round((strtotime($editedSubtask['end']['dateTime']) - strtotime($editedSubtask['start']['dateTime'])) / 3600,
                    1),
                'description'          => $editedSubtask['body']['content'],
                'deadline'             => Carbon::parse($editedSubtask['end']['dateTime'])->setTimezone('Europe/Bratislava'),
                'office365_location'   => $editedSubtask['location']['displayName'],
            ]);

            $oldTimeblock = $subtask->timeblocks->first();

            // ak sa zmenilo trvanie alebo casy subtasku, tak sa updatne aj timeblock
            if ($oldTimeblock['start'] != Carbon::parse($editedSubtask['start']['dateTime'])->setTimezone('Europe/Bratislava') || $oldTimeblock['end'] != Carbon::parse($editedSubtask['end']['dateTime'])->setTimezone('Europe/Bratislava')) {
                $subtask->syncTimeblocks([
                    [
                        'sub_task_id' => $subtask->id,
                        'start'       => Carbon::parse($editedSubtask['start']['dateTime'])->setTimezone('Europe/Bratislava'),
                        'end'         => Carbon::parse($editedSubtask['end']['dateTime'])->setTimezone('Europe/Bratislava'),
                        'is_finished' => 0,
                    ]
                ]);
            }
        }

        // manualne musim trignernut tuto operaciu, lebo cez Observer sa to nespusti - ten je nastaveny len na update subtasku
        Subtask::where('office365_id', $editedSubtask['id'])->first()->mastertask->recalculateEstimatedTime();
    }

    private static function getSubtasksToDeleteFromEditedEvents(
        $id,
        mixed $attendees
    ): \Illuminate\Support\Collection|array|\LaravelIdea\Helper\App\Models\_IH_SubTask_C {
        $subtasksToDelete = SubTask::where('is_finished', 0)->where('office365_id',
            $id)->get()->filter(function ($subtask) use (
            $attendees
        ) {
            $event = collect($attendees)->firstWhere('emailAddress.address', $subtask->user->email);

            return ! $event;
        });

        return $subtasksToDelete;
    }

    /**
     * @param  array|\LaravelIdea\Helper\App\Models\_IH_SubTask_C|\Illuminate\Support\Collection  $removedSubtasks
     *
     * @return void
     */
    private static function removeSubtask($subtask
    ): void {
        // vymazanie timeblockov
        foreach ($subtask->timeblocks as $timeblock) {
            $timeblock->delete();
        }

        // vymazanie timesheetov
        foreach ($subtask->timesheets as $timesheet) {
            $timesheet->delete();
        }

        $subtask->delete();
    }

    /**
     * @param  mixed  $attendees
     * @param  mixed  $editedSubtask
     *
     * @return void
     */
    private static function createNewSubtaskToNewAttendee(mixed $attendees, mixed $editedSubtask): void
    {
        $newAttendees = array_filter($attendees, function ($attendee) use ($editedSubtask) {
            $idsOfAttendees = SubTask::where('office365_id', $editedSubtask['id'])->get()->pluck('user_id')->toArray();

            $idOfUserFromOffice365 = User::where('email', $attendee['emailAddress']['address'])->first();

            // if user doesnt exist in our database, we skip it
            if ( ! $idOfUserFromOffice365) {
                return false;
            }

            return ! in_array($idOfUserFromOffice365->id, $idsOfAttendees);
        });

        // nakopiruj subtask tak, ze bude obsahovat iba newAttendees
        $editedSubtaskWithOnlyNewAttendees = $editedSubtask;

        $editedSubtaskWithOnlyNewAttendees['attendees'] = $newAttendees;

        $project = Project::where('code', explode(' ', $editedSubtask['subject'])[0])->first();

        // ak existuje viac master taskov, pouzijeme posledny
        $mastertask = MasterTask::where('project_id', $project->id)->latest()->first();

        self::addSubtask($editedSubtaskWithOnlyNewAttendees, $mastertask);
    }

    public static function removeBlockers(mixed $blockers_from_office365)
    {
        // get all canceled blockers - the ones, that are in our database and in the response they have isCancelled => true
        $removedBlockers = Blocker::whereNotNull('office365_id')->get()->filter(function ($blocker) use (
            $blockers_from_office365
        ) {
            $event = collect($blockers_from_office365)->firstWhere('id', $blocker->office365_id);

            return $event && $event['isCancelled'];
        });

        $removedBlockers->each(function ($blocker) {
            try {
                $blocker->delete();
            } catch (\Exception $e) {
                // log error
                Mail::to('feher@studiotem.com')->send(new Error($e));
                \Log::error($e->getMessage());
            }
        });
    }

    /**
     * @param $id
     * @param  mixed  $attendees
     *
     * @return SubTask[]|\Illuminate\Support\Collection|\LaravelIdea\Helper\App\Models\_IH_SubTask_C
     */

    public static function removeSubtasks(mixed $subtasks_from_office365)
    {
        // get all canceled subtasks - the ones, that are in our database and in the response they have isCancelled => true
        $removedSubtasks = SubTask::where('is_finished', 0)->whereNotNull('office365_id')->get()->filter(function (
            $subtask
        ) use (
            $subtasks_from_office365
        ) {
            $event = collect($subtasks_from_office365)->firstWhere('id', $subtask->office365_id);

            return $event && $event['isCancelled'];
        });


        foreach ($removedSubtasks as $removed_subtask) {
            try {
                self::removeSubtask($removed_subtask);
            } catch (\Exception $e) {
                Mail::to('feher@studiotem.com')->send(new Error($e));
                \Log::error($e->getMessage());
            }
        }
    }

    public static function finishSubtasks(mixed $subtasks)
    {
        foreach ($subtasks as $subtask) {
            try {
                // ukoncenie timeblocks
                foreach ($subtask->timeblocks as $timeblock) {
                    $timeblock->update([
                        'is_finished' => 1,
                    ]);
                }

                // pridanie odtrackovaneho casu
                $subtask->syncTimesheets([
                    [
                        'sub_task_id' => $subtask->id,
                        'employee_id' => $subtask->user_id,
                        'time'        => $subtask->estimated_time,
                    ],
                ]);

                $subtask->update([
                    'is_finished' => 1,
                ]);
            } catch (\Exception $e) {
                Mail::to('feher@studiotem.com')->send(new Error($e));
                \Log::error($e->getMessage());
            }
        }

        // manualne musim trignernut tuto operaciu, lebo cez Observer sa to nespusti - ten je nastaveny len na update subtasku
        $subtasks->first()->mastertask->recalculateTrackedTime();
    }
}