<?php

namespace App\Http\Controllers\api;

use App\Http\Controllers\Controller;
use App\Models\LegalOpinion;
use App\Models\LegalOpinionCategory;
use App\Traits\BaseApiResponse;
use Illuminate\Http\Request;

class LegalOpinionApiController extends Controller
{
    use BaseApiResponse;

    public function categories()
    {
        $categories = LegalOpinionCategory::all()->map(function ($category) {
            return [
                'id' => $category->id,
                'name' => $category->name,
            ];
        });

        return $this->success($categories, 'Success', 'Categories List');
    }

    public function index(Request $request)
    {
        $request->validate([
            'category_id' => 'nullable|exists:legal_opinion_categories,id',
            'sort'        => 'nullable|in:asc,desc',
            'per_page'    => 'nullable|integer|min:1|max:100',
        ]);

        $query = LegalOpinion::query();

        if ($request->filled('category_id')) {
            $query->where('category_id', $request->category_id);
        }

        $sortOrder = $request->input('sort', 'desc');
        $query->orderBy('opinion_date', $sortOrder);

        $perPage = min(max((int) $request->input('per_page', 15), 10), 100);
        $paginator = $query->paginate($perPage);

        $items = collect($paginator->items())->map(function ($item) {
            return $this->formatItem($item);
        });

        $responseData = [
            'items'        => $items,
            'current_page' => $paginator->currentPage(),
            'last_page'    => $paginator->lastPage(),
            'per_page'     => $paginator->perPage(),
            'total'        => $paginator->total(),
        ];

        return $this->success($responseData, 'Success', 'Legal Opinions Fetched');
    }

    public function search(Request $request)
    {
        $request->validate([
            'search'   => 'nullable|string',
            'per_page' => 'nullable|integer|min:1|max:100',
        ]);

        $query = LegalOpinion::query();

        if ($request->filled('search')) {
            $searchTerm = $request->input('search');

            $query->where(function ($q) use ($searchTerm) {
                $q->where('opinion_number', 'LIKE', "%{$searchTerm}%")
                    ->orWhere('subject', 'LIKE', "%{$searchTerm}%")
                    ->orWhere('full_text', 'LIKE', "%{$searchTerm}%")
                    ->orWhere('issuing_authority', 'LIKE', "%{$searchTerm}%");
            });
        }

        $perPage = min(max((int) $request->input('per_page', 15), 10), 100);
        $paginator = $query->orderBy('opinion_date', 'desc')->paginate($perPage);

        $items = collect($paginator->items())->map(function ($item) {
            return $this->formatItem($item);
        });

        $responseData = [
            'items'        => $items,
            'current_page' => $paginator->currentPage(),
            'last_page'    => $paginator->lastPage(),
            'per_page'     => $paginator->perPage(),
            'total'        => $paginator->total(),
        ];

        return $this->success($responseData, 'Success', 'Search Results Fetched');
    }

    public function fast_search(Request $request)
    {
        $searchTerm = $request->input('search');
        $query = LegalOpinion::query();

        if ($request->filled('search')) {
            $query->where(function ($q) use ($searchTerm) {
                $q->where('opinion_number', 'LIKE', "%{$searchTerm}%")
                    ->orWhere('subject', 'LIKE', "%{$searchTerm}%")
                    ->orWhere('full_text', 'LIKE', "%{$searchTerm}%")
                    ->orWhere('issuing_authority', 'LIKE', "%{$searchTerm}%");
            });
        }

        $count = $query->count();
        // Limit to 5 results for fast search dropdown
        $items = $query->orderBy('opinion_date', 'desc')->take(5)->get()->map(function ($item) {
            return $this->formatItem($item);
        });

        return $this->success([
            'items' => $items,
            'count' => $count
        ], 'Success', 'Fast Search Results');
    }

    public function pager($id)
    {
        $current = LegalOpinion::find($id);

        if (!$current) {
            return $this->failed([], [
                'title' => 'خطا',
                'message' => 'نظریه قانونی مورد نظر یافت نشد.'
            ], 404);
        }

        $previousItem = LegalOpinion::where(function ($query) use ($current) {
            if ($current->opinion_date) {
                $query->where('opinion_date', '<', $current->opinion_date)
                    ->orWhere(function ($subQuery) use ($current) {
                        $subQuery->where('opinion_date', '=', $current->opinion_date)
                            ->where('id', '<', $current->id);
                    });
            } else {
                $query->whereNull('opinion_date')->where('id', '<', $current->id);
            }
        })
            ->orderBy('opinion_date', 'desc')
            ->orderBy('id', 'desc')
            ->first();

        $nextItem = LegalOpinion::where(function ($query) use ($current) {
            if ($current->opinion_date) {
                $query->where('opinion_date', '>', $current->opinion_date)
                    ->orWhere(function ($subQuery) use ($current) {
                        $subQuery->where('opinion_date', '=', $current->opinion_date)
                            ->where('id', '>', $current->id);
                    });
            } else {
                $query->whereNotNull('opinion_date')
                    ->orWhere(function ($subQuery) use ($current) {
                        $subQuery->whereNull('opinion_date')->where('id', '>', $current->id);
                    });
            }
        })
            ->orderBy('opinion_date', 'asc')
            ->orderBy('id', 'asc')
            ->first();

        $results = array_values(array_filter([
            $previousItem ? $this->formatItem($previousItem) : null,
            $this->formatItem($current),
            $nextItem ? $this->formatItem($nextItem) : null
        ]));

        return $this->success($results, 'Success', 'Pager Window Details');
    }

    private function isLockedForCurrentUser($item): bool
    {
        return ! auth()->user()->isSubscriber() && (bool) ($item->is_locked ?? false);
    }

    private function formatItem($item)
    {
        $isLocked = $this->isLockedForCurrentUser($item);

        return [
            'id'                => $item->id,
            'opinion_number'    => $item->opinion_number,
            'opinion_date'      => $item->opinion_date,
            'subject'           => $item->subject,
            'full_text'         => $isLocked ? null : $item->full_text,
            'issuing_authority' => $item->issuing_authority,
            'category_id'       => $item->category_id,
            'category_name'     => optional($item->category)->name,
            'is_locked'         => $isLocked,
        ];
    }
}