<?php

namespace App\Http\Controllers\Admin\Office;

use App\Http\Controllers\Controller;
use App\Models\Office\Approval;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class ApprovalController extends Controller
{
    public function index(Request $request): JsonResponse
    {
        $query = Approval::query()->with(['template', 'applicant']);
        $query->when($request->has('status'), fn($q) => $q->where('status', $request->status));
        $query->when($request->applicant_id, fn($q, $v) => $q->where('applicant_id', $v));

        return $this->paginate($query->latest()->paginate($request->input('per_page', 15)));
    }

    public function store(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'title' => 'required|string|max:255',
            'template_id' => 'nullable|exists:approval_templates,id',
            'form_data' => 'nullable|array',
            'related_type' => 'nullable|string|max:50',
            'related_id' => 'nullable|integer',
        ]);
        $validated['applicant_id'] = auth()->id();
        $validated['status'] = 0;

        return $this->success(Approval::create($validated));
    }

    public function show(Approval $approval): JsonResponse
    {
        return $this->success($approval->load(['template', 'applicant', 'nodes.approver']));
    }

    public function update(Request $request, Approval $approval): JsonResponse
    {
        if ($approval->status > 1) {
            return $this->error('该审批已完结，无法修改', 40001);
        }
        $validated = $request->validate([
            'title' => 'sometimes|string|max:255',
            'form_data' => 'nullable|array',
        ]);
        $approval->update($validated);

        return $this->success($approval);
    }

    public function destroy(Approval $approval): JsonResponse
    {
        if ($approval->status > 1) {
            return $this->error('该审批已完结，无法删除', 40001);
        }
        $approval->delete();

        return $this->success(null);
    }

    public function approve(Approval $approval): JsonResponse
    {
        $node = $approval->nodes()
            ->where('approver_id', auth()->id())
            ->where('action', 0)
            ->where('node_order', $approval->current_node)
            ->first();

        if (!$node) {
            return $this->error('无待处理的审批节点', 40001);
        }

        $node->update(['action' => 1, 'acted_at' => now()]);

        $pendingNodes = $approval->nodes()->where('action', 0)->exists();
        if (!$pendingNodes) {
            $approval->update(['status' => 2]);
        } else {
            $approval->update([
                'status' => 1,
                'current_node' => $approval->current_node + 1,
            ]);
        }

        return $this->success($approval->load('nodes'));
    }

    public function reject(Request $request, Approval $approval): JsonResponse
    {
        $node = $approval->nodes()
            ->where('approver_id', auth()->id())
            ->where('action', 0)
            ->where('node_order', $approval->current_node)
            ->first();

        if (!$node) {
            return $this->error('无待处理的审批节点', 40001);
        }

        $validated = $request->validate([
            'comment' => 'nullable|string|max:255',
        ]);

        $node->update([
            'action' => 2,
            'comment' => $validated['comment'] ?? null,
            'acted_at' => now(),
        ]);
        $approval->update(['status' => 3]);

        return $this->success($approval->load('nodes'));
    }

    public function withdraw(Approval $approval): JsonResponse
    {
        if ($approval->status > 1) {
            return $this->error('该审批已完结，无法撤回', 40001);
        }
        $approval->update(['status' => 4]);

        return $this->success($approval);
    }
}