<?php

namespace App\Http\Controllers;

use App\Http\Resources\PersonCollection;
use App\Models\Person;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Exception;

class PublicSearchController extends Controller
{
    /**
     * Search for persons with various filters
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function search(Request $request): JsonResponse
    {
        try {
            $query = $this->buildSearchQuery($request);
            $persons = $this->paginateAndLoadRelations($query, $request);
            
            return response()->json([
                'success' => true,
                'data' => new PersonCollection($persons),
                'message' => 'Public search results retrieved successfully'
            ]);
        } catch (Exception $e) {
            return response()->json([
                'success' => false,
                'message' => 'Failed to retrieve search results',
                'error' => $e->getMessage()
            ], 500);
        }
    }

    /**
     * Build the search query with all filters applied
     *
     * @param Request $request
     * @return Builder
     */
    private function buildSearchQuery(Request $request): Builder
    {
        $query = Person::query();
        $useOrConditions = $this->shouldUseOrConditions($request);
        
        // Apply basic filters (firstName, lastName, etc.)
        $this->applyBasicFilters($query, $request, $useOrConditions);
        
        // Apply relation-based filters
        $this->applyYearOfArrivalFilter($query, $request);
        $this->applyAgeAtMigrationFilter($query, $request);
        $this->applySettlementLocationFilter($query, $request);
        
        return $query;
    }

    /**
     * Determine if OR logic should be used between filters
     *
     * @param Request $request
     * @return bool
     */
    private function shouldUseOrConditions(Request $request): bool
    {
        $exactMatch = $request->boolean('exactMatch');
        $useOrLogic = $request->boolean('useOrLogic');
        
        return $useOrLogic || $exactMatch;
    }

    /**
     * Apply filters for fields in the Person table
     *
     * @param Builder $query
     * @param Request $request
     * @param bool $useOrConditions
     * @return void
     */
    private function applyBasicFilters(Builder $query, Request $request, bool $useOrConditions): void
    {
        $filters = $this->collectBasicFilters($request);
        
        if (empty($filters)) {
            return;
        }
        
        if ($useOrConditions) {
            $this->applyFiltersWithOrLogic($query, $filters);
        } else {
            $this->applyFiltersWithAndLogic($query, $filters);
        }
    }

    /**
     * Collect basic filters from the request
     *
     * @param Request $request
     * @return array
     */
    private function collectBasicFilters(Request $request): array
    {
        $exactMatch = $request->boolean('exactMatch');
        $filters = [];
        
        $filterFields = [
            'id_card_no' => 'id_card_no',
            'firstName' => 'christian_name',
            'lastName' => 'surname',
            'regionOfOrigin' => 'place_of_birth'
        ];
        
        foreach ($filterFields as $requestKey => $dbField) {
            if ($request->has($requestKey) && $request->input($requestKey) !== 'all') {
                $value = $request->input($requestKey);
                
                if ($exactMatch) {
                    // For exact matching, use raw query with BINARY for strict case-sensitive matching
                    $filters[] = [$dbField, 'raw', $value];
                } else {
                    // For partial matching, use standard LIKE with wildcards
                    $filters[] = [$dbField, 'LIKE', "%{$value}%"];
                }
            }
        }
        
        return $filters;
    }

    /**
     * Apply filters using OR logic
     *
     * @param Builder $query
     * @param array $filters
     * @return void
     */
    private function applyFiltersWithOrLogic(Builder $query, array $filters): void
    {
        $query->where(function ($q) use ($filters) {
            foreach ($filters as $index => $filter) {
                $method = $index === 0 ? 'where' : 'orWhere';
                
                if ($filter[1] === 'raw') {
                    // Handle raw exact matching (case-sensitive)
                    $field = $filter[0];
                    $value = $filter[2];
                    $q->whereRaw("BINARY {$field} = ?", [$value]);
                } else {
                    // Handle standard operators
                    $q->{$method}($filter[0], $filter[1], $filter[2]);
                }
            }
        });
    }

    /**
     * Apply filters using AND logic
     *
     * @param Builder $query
     * @param array $filters
     * @return void
     */
    private function applyFiltersWithAndLogic(Builder $query, array $filters): void
    {
        foreach ($filters as $filter) {
            if ($filter[1] === 'raw') {
                // Handle raw exact matching (case-sensitive)
                $field = $filter[0];
                $value = $filter[2];
                $query->whereRaw("BINARY {$field} = ?", [$value]);
            } else {
                // Handle standard operators
                $query->where($filter[0], $filter[1], $filter[2]);
            }
        }
    }

    /**
     * Filter by Year of Arrival
     *
     * @param Builder $query
     * @param Request $request
     * @return void
     */
    private function applyYearOfArrivalFilter(Builder $query, Request $request): void
    {
        if ($request->has('yearOfArrival') && $request->yearOfArrival !== 'all') {
            $year = $request->yearOfArrival;
            $query->whereHas('migration', function (Builder $subQuery) use ($year) {
                $subQuery->whereYear('date_of_arrival_aus', $year)
                        ->orWhereYear('date_of_arrival_nt', $year);
            });
        }
    }

    /**
     * Filter by Age at Migration
     *
     * @param Builder $query
     * @param Request $request
     * @return void
     */
    private function applyAgeAtMigrationFilter(Builder $query, Request $request): void
    {
        if ($request->has('ageAtMigration') && $request->ageAtMigration !== 'all') {
            $ageAtMigration = (int) $request->ageAtMigration;
            
            $query->whereHas('migration', function (Builder $subQuery) use ($ageAtMigration) {
                $subQuery->whereRaw('YEAR(date_of_arrival_aus) - YEAR(person.date_of_birth) = ?', [$ageAtMigration])
                        ->orWhereRaw('YEAR(date_of_arrival_nt) - YEAR(person.date_of_birth) = ?', [$ageAtMigration]);
            });
        }
    }

    /**
     * Filter by Settlement Location
     *
     * @param Builder $query
     * @param Request $request
     * @return void
     */
    private function applySettlementLocationFilter(Builder $query, Request $request): void
    {
        if ($request->has('settlementLocation') && $request->settlementLocation !== 'all') {
            $location = $request->settlementLocation;
            $query->whereHas('residence', function (Builder $subQuery) use ($location) {
                $subQuery->where('town_or_city', 'LIKE', "%{$location}%");
            });
        }
    }

    /**
     * Paginate results and load related models
     *
     * @param Builder $query
     * @param Request $request
     * @return \Illuminate\Pagination\LengthAwarePaginator
     */
    private function paginateAndLoadRelations(Builder $query, Request $request): \Illuminate\Pagination\LengthAwarePaginator
    {
        $perPage = $request->input('per_page', 10);
        $persons = $query->paginate($perPage);
        
        // Eager load related models
        $persons->getCollection()->each->load([
            'migration', 
            'naturalization', 
            'residence', 
            'family', 
            'internment'
        ]);
        
        return $persons;
    }
    
    /**
     * Get a specific migrant record by ID
     *
     * @param mixed $id
     * @return JsonResponse
     */
    public function getRecord($id): JsonResponse
    {
        try {
            $person = Person::with([
                'migration',
                'naturalization',
                'residence',
                'family',
                'internment'
            ])->findOrFail($id);
            
            return response()->json([
                'success' => true,
                'data' => $person,
                'message' => 'Record retrieved successfully'
            ]);
        } catch (Exception $e) {
            return response()->json([
                'success' => false,
                'message' => 'Record not found',
                'error' => $e->getMessage()
            ], 404);
        }
    }
}