<?php

namespace App\Http\Controllers\API;

use App\Http\Controllers\Controller;
use App\Http\Requests\API\ApprovalFlow\CreateOrUpdateRequest;
use App\Http\Resources\API\ApprovalFlowDetailResource;
use App\Http\Resources\API\ApprovalFlowResource;
use App\Models\ApprovalFlow;
use App\Models\Enums\ApprovalFlowType;
use App\Models\User;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class ApprovalFlowController extends Controller
{
    public function index()
    {
        $approvalFlows = ApprovalFlow::query()->with(['createdBy'])->orderByDesc("id")->paginate();

        return ApprovalFlowResource::collection($approvalFlows);
    }

    public function store(CreateOrUpdateRequest $request)
    {
        $nodes = $this->getApprovalNodes($request);

        $limitObject = $request->get("object_type") && $request->get("object_id") && in_array($request->get("type"), [ApprovalFlowType::TASK->value]);

        $exists = ApprovalFlow::query()->where("type", $request->type)
            ->when(
                $limitObject,
                fn ($query) => $query->where([
                    'object_type' => $request->object_type,
                    'object_id' => $request->object_id,
                ])
            )
            ->count();
        throw_validation_if($exists, "Please do not add repeatedly.");

        $approvalFlow = new ApprovalFlow();
        $approvalFlow->mergeFillable([
            'company_id', 'type'
        ]);

        $approvalFlow->fill([
            ...$request->all(),
            'company_id' => Auth::user()->company_id,
            'created_by' => Auth::id(),
            'nodes' => $nodes,
        ]);
        $approvalFlow->save();

        return $this->created();
    }

    protected function getApprovalNodes(Request $request)
    {
        $nodes = [];
        foreach ($request->nodes as $node) {
            $userCount = User::query()->whereIn("id", $node['approval_users'])->count();

            throw_validation_if($userCount != count($node['approval_users']), "The selected approver does not exist");

            $nodes[$node['level']] = $node;
        }

        throw_validation_if(max(array_keys($nodes)) != count($nodes), "The level field is incorrect");

        return $nodes;
    }

    public function update(CreateOrUpdateRequest $request, string $id)
    {
        $approvalFlow = ApprovalFlow::query()->findOrFail($id);

        $nodes = $this->getApprovalNodes($request);

        $nodeIsChange = false;
        if (count($nodes) != count($approvalFlow->nodes)) {
            $nodeIsChange = true;
        } else {
            foreach ($approvalFlow->nodes as $node) {
                $oldNodeUsers = $node['approval_users'];
                $nowNodeUsers = $nodes[$node['level']]['approval_users'];

                sort($oldNodeUsers);
                sort($nowNodeUsers);

                if (implode(',', $oldNodeUsers) != implode(',', $nowNodeUsers)) {
                    $nodeIsChange = true;
                    break;
                }
            }
        }

        if ($nodeIsChange) {
            $newApprovalFlow = new ApprovalFlow();
            $newApprovalFlow->mergeFillable([
                'company_id', 'type',
            ]);

            $newApprovalFlow->fill([
                'name' => $request->name,
                'type' => $approvalFlow->type,
                'object_type' => $approvalFlow->object_type,
                'object_id' => $approvalFlow->object_id,
                'company_id' => Auth::user()->company_id,
                'created_by' => Auth::id(),
                'nodes' => $nodes,
            ]);
            $newApprovalFlow->save();

            $approvalFlow->delete();

            return new ApprovalFlowDetailResource($newApprovalFlow);
        } else {
            $approvalFlow->name = $request->name;
            $approvalFlow->nodes = $nodes;
            $approvalFlow->save();
        }

        return new ApprovalFlowDetailResource($approvalFlow);
    }

    public function show(string $id)
    {
        $approvalFlow = ApprovalFlow::query()->findOrFail($id);

        return new ApprovalFlowDetailResource($approvalFlow);
    }

    public function destroy(string $id)
    {
        $approvalFlow = ApprovalFlow::query()->findOrFail($id);

        $approvalFlow->delete();

        return $this->noContent();
    }
}