<?php

namespace App\Http\Controllers\Api\V1\Household;

use App\Http\Controllers\Api\V1\ApiController;
use App\Http\Requests\Household\StoreHouseholdMemberRequest;
use App\Http\Requests\Household\StoreHouseholdRequest;
use App\Http\Requests\Household\UpdateHouseholdRequest;
use App\Http\Requests\Household\UploadProofRequest;
use App\Http\Resources\HouseholdResource;
use App\Models\Household;
use App\Models\HouseholdMember;
use App\Models\User;
use App\Services\DropOff\DropOffPointFinder;
use App\Services\Geo\GeoLocationService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;
use MatanYadaev\EloquentSpatial\Objects\Point;

class HouseholdController extends ApiController
{
    public function store(
        StoreHouseholdRequest $request,
        GeoLocationService $geo,
        DropOffPointFinder $dopFinder,
    ): JsonResponse {
        $data = $request->validated();
        $user = $request->user();

        $existing = Household::where('head_user_id', $user->id)->first();
        if ($existing) {
            return $this->fail(
                'You already have a household. Update it instead.',
                ['head_user_id' => ['already_has_household']],
                409,
            );
        }

        $point = new Point((float) $data['lat'], (float) $data['lng'], 4326);

        $barangayId = $data['barangay_id'] ?? null;
        if (! $barangayId) {
            $resolved = $geo->findBarangayByCoordinates((float) $data['lat'], (float) $data['lng']);
            $barangayId = $resolved?->id;
        }

        $nearestDop = $dopFinder->nearest((float) $data['lat'], (float) $data['lng']);

        $household = DB::transaction(function () use ($data, $user, $point, $barangayId, $nearestDop) {
            $h = Household::create([
                'head_user_id' => $user->id,
                'barangay_id' => $barangayId,
                'address_line' => $data['address_line'],
                'coordinates' => $point,
                'household_size' => $data['household_size'],
                'assigned_drop_off_point_id' => $nearestDop?->id,
                'verification_status' => Household::VERIFICATION_PENDING,
            ]);

            HouseholdMember::create([
                'household_id' => $h->id,
                'user_id' => $user->id,
                'relationship' => HouseholdMember::RELATIONSHIP_HEAD,
                'full_name' => $user->full_name,
            ]);

            return $h;
        });

        return $this->created(
            new HouseholdResource(
                $household->fresh()
                    ->load(['head', 'barangay', 'members.user', 'assignedDropOffPoint'])
                    ->loadCount('members'),
            ),
            'Household created. Upload proof of residency to begin verification.',
        );
    }

    public function show(Request $request, Household $household): JsonResponse
    {
        $this->authorizeView($request->user(), $household);
        $household->load(['head', 'barangay.cityMunicipality', 'members.user', 'assignedDropOffPoint'])
            ->loadCount('members');

        return $this->ok(new HouseholdResource($household));
    }

    public function reassignDropOff(Request $request, Household $household, DropOffPointFinder $finder): JsonResponse
    {
        $this->authorizeOwn($request->user(), $household);

        if (! $household->coordinates) {
            return $this->fail('Household has no coordinates on file', null, 422);
        }

        $nearest = $finder->nearest(
            $household->coordinates->latitude,
            $household->coordinates->longitude,
        );

        $household->forceFill(['assigned_drop_off_point_id' => $nearest?->id])->save();

        return $this->ok(
            new HouseholdResource(
                $household->fresh()->load(['assignedDropOffPoint', 'barangay'])->loadCount('members'),
            ),
            $nearest ? 'Reassigned to nearest drop-off point' : 'No nearby drop-off point found',
        );
    }

    public function update(UpdateHouseholdRequest $request, Household $household): JsonResponse
    {
        $this->authorizeOwn($request->user(), $household);

        if ($household->verification_status === Household::VERIFICATION_APPROVED) {
            return $this->fail(
                'Approved households cannot be edited. Contact an admin.',
                null,
                422,
            );
        }

        $data = $request->validated();

        if (isset($data['lat'], $data['lng'])) {
            $data['coordinates'] = new Point((float) $data['lat'], (float) $data['lng'], 4326);
        }
        unset($data['lat'], $data['lng']);

        $household->update($data);

        // Editing a rejected household resets it to pending.
        if ($household->verification_status === Household::VERIFICATION_REJECTED) {
            $household->forceFill([
                'verification_status' => Household::VERIFICATION_PENDING,
                'rejection_reason' => null,
            ])->save();
        }

        return $this->ok(
            new HouseholdResource(
                $household->fresh()->load(['head', 'barangay', 'members.user'])->loadCount('members'),
            ),
            'Household updated',
        );
    }

    public function uploadProof(UploadProofRequest $request, Household $household): JsonResponse
    {
        $this->authorizeOwn($request->user(), $household);

        $path = $request->file('proof')->store('households/proofs', 'local');

        $household->forceFill(['proof_of_residency_path' => $path]);
        if ($household->verification_status === Household::VERIFICATION_REJECTED) {
            $household->forceFill([
                'verification_status' => Household::VERIFICATION_PENDING,
                'rejection_reason' => null,
            ]);
        }
        $household->save();

        return $this->ok(
            new HouseholdResource($household->fresh()->load(['head', 'barangay'])->loadCount('members')),
            'Proof of residency uploaded',
        );
    }

    public function addMember(StoreHouseholdMemberRequest $request, Household $household): JsonResponse
    {
        $this->authorizeOwn($request->user(), $household);

        $data = $request->validated();
        $member = HouseholdMember::create([
            'household_id' => $household->id,
            'user_id' => $data['user_id'] ?? null,
            'relationship' => $data['relationship'],
            'full_name' => $data['full_name'] ?? null,
            'date_of_birth' => $data['date_of_birth'] ?? null,
        ]);

        return $this->created(
            new HouseholdResource(
                $household->fresh()->load(['head', 'barangay', 'members.user'])->loadCount('members'),
            ),
            'Member added',
        );
    }

    public function removeMember(Request $request, Household $household, HouseholdMember $member): JsonResponse
    {
        $this->authorizeOwn($request->user(), $household);

        if ($member->household_id !== $household->id) {
            return $this->notFound('Member not found in this household');
        }

        if ($member->relationship === HouseholdMember::RELATIONSHIP_HEAD) {
            return $this->fail('Cannot remove the head of household', null, 422);
        }

        $member->delete();

        return $this->ok(null, 'Member removed');
    }

    private function authorizeOwn(User $user, Household $household): void
    {
        if ($household->head_user_id !== $user->id) {
            abort(403, 'You do not own this household');
        }
    }

    private function authorizeView(User $user, Household $household): void
    {
        if ($household->head_user_id === $user->id) {
            return;
        }
        if ($user->role === User::ROLE_ADMIN) {
            return;
        }
        if ($household->members()->where('user_id', $user->id)->exists()) {
            return;
        }
        abort(403, 'You do not have access to this household');
    }
}