<?php

/*
 * BudgetEnrichment.php
 * Copyright (c) 2025 james@firefly-iii.org
 *
 * This file is part of Firefly III (https://github.com/firefly-iii).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace FireflyIII\Support\JsonApi\Enrichments;

use Carbon\Carbon;
use FireflyIII\Models\AutoBudget;
use FireflyIII\Models\Budget;
use FireflyIII\Models\Note;
use FireflyIII\Models\ObjectGroup;
use FireflyIII\Models\UserGroup;
use FireflyIII\Repositories\Budget\OperationsRepositoryInterface;
use FireflyIII\User;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

class BudgetEnrichment implements EnrichmentInterface
{
    private array $autoBudgets     = [];
    private Collection $collection;
    private array   $currencies    = [];
    private ?Carbon $end           = null;
    private array   $ids           = [];
    private array   $mappedObjects = [];
    private array   $notes         = [];
    private array   $objectGroups  = [];
    private array   $pcSpent       = [];
    private array   $spent         = [];
    private ?Carbon $start         = null;
    private User $user;
    private UserGroup $userGroup;

    public function enrich(Collection $collection): Collection
    {
        $this->collection = $collection;
        $this->collectIds();
        $this->collectNotes();
        $this->collectAutoBudgets();
        $this->collectExpenses();
        $this->collectObjectGroups();

        $this->appendCollectedData();

        return $this->collection;
    }

    public function enrichSingle(array|Model $model): array|Model
    {
        Log::debug(__METHOD__);
        $collection = new Collection()->push($model);
        $collection = $this->enrich($collection);

        return $collection->first();
    }

    public function setEnd(?Carbon $end): void
    {
        $this->end = $end;
    }

    public function setStart(?Carbon $start): void
    {
        $this->start = $start;
    }

    public function setUser(User $user): void
    {
        $this->user = $user;
        $this->setUserGroup($user->userGroup);
    }

    public function setUserGroup(UserGroup $userGroup): void
    {
        $this->userGroup = $userGroup;
    }

    private function appendCollectedData(): void
    {
        $this->collection = $this->collection->map(function (Budget $item): Budget {
            $id         = (int) $item->id;
            $meta       = [
                'object_group_id'    => null,
                'object_group_order' => null,
                'object_group_title' => null,
                'notes'              => $this->notes[$id] ?? null,
                'currency'           => $this->currencies[$id] ?? null,
                'auto_budget'        => $this->autoBudgets[$id] ?? null,
                'spent'              => $this->spent[$id] ?? null,
                'pc_spent'           => $this->pcSpent[$id] ?? null,
            ];

            // add object group if available
            if (array_key_exists($id, $this->mappedObjects)) {
                $key                        = $this->mappedObjects[$id];
                $meta['object_group_id']    = (string) $this->objectGroups[$key]['id'];
                $meta['object_group_title'] = $this->objectGroups[$key]['title'];
                $meta['object_group_order'] = $this->objectGroups[$key]['order'];
            }

            $item->meta = $meta;

            return $item;
        });
    }

    private function collectAutoBudgets(): void
    {
        $set = AutoBudget::whereIn('budget_id', $this->ids)->with(['transactionCurrency'])->get();

        /** @var AutoBudget $autoBudget */
        foreach ($set as $autoBudget) {
            $budgetId                     = (int) $autoBudget->budget_id;
            $this->currencies[$budgetId]  = $autoBudget->transactionCurrency;
            $this->autoBudgets[$budgetId] = [
                'type'      => (int) $autoBudget->auto_budget_type,
                'period'    => $autoBudget->period,
                'amount'    => $autoBudget->amount,
                'pc_amount' => $autoBudget->native_amount,
            ];
        }
    }

    private function collectExpenses(): void
    {
        if ($this->start instanceof Carbon && $this->end instanceof Carbon) {
            /** @var OperationsRepositoryInterface $opsRepository */
            $opsRepository = app(OperationsRepositoryInterface::class);
            $opsRepository->setUser($this->user);
            $opsRepository->setUserGroup($this->userGroup);
            // $spent = $this->beautify();
            // $set = $this->opsRepository->sumExpenses($start, $end, null, new Collection()->push($budget))
            $expenses      = $opsRepository->collectExpenses($this->start, $this->end, null, $this->collection);
            foreach ($this->collection as $item) {
                $id                 = (int) $item->id;
                $this->spent[$id]   = array_values($opsRepository->sumCollectedExpensesByBudget($expenses, $item));
                $this->pcSpent[$id] = array_values($opsRepository->sumCollectedExpensesByBudget($expenses, $item, true));
            }
        }
    }

    private function collectIds(): void
    {
        /** @var Budget $budget */
        foreach ($this->collection as $budget) {
            $this->ids[] = (int) $budget->id;
        }
        $this->ids = array_unique($this->ids);
    }

    private function collectNotes(): void
    {
        $notes = Note::query()
            ->whereIn('noteable_id', $this->ids)
            ->whereNotNull('notes.text')
            ->where('notes.text', '!=', '')
            ->where('noteable_type', Budget::class)
            ->get(['notes.noteable_id', 'notes.text'])
            ->toArray()
        ;
        foreach ($notes as $note) {
            $this->notes[(int) $note['noteable_id']] = (string) $note['text'];
        }

        //        Log::debug(sprintf('Enrich with %d note(s)', count($this->notes)));
    }

    private function collectObjectGroups(): void
    {
        $set    = DB::table('object_groupables')
            ->whereIn('object_groupable_id', $this->ids)
            ->where('object_groupable_type', Budget::class)
            ->get(['object_groupable_id', 'object_group_id'])
        ;

        $ids    = array_unique($set->pluck('object_group_id')->toArray());

        foreach ($set as $entry) {
            $this->mappedObjects[(int) $entry->object_groupable_id] = (int) $entry->object_group_id;
        }

        $groups = ObjectGroup::whereIn('id', $ids)->get(['id', 'title', 'order'])->toArray();
        foreach ($groups as $group) {
            $group['id']                            = (int) $group['id'];
            $group['order']                         = (int) $group['order'];
            $this->objectGroups[(int) $group['id']] = $group;
        }
    }
}
