<?php

namespace App\Services\ProjectManagement;

use App\Models\Admin\AdminPmIssue;
use App\Models\Admin\AdminPmProject;
use App\Models\Admin\AdminPmTask;
use Illuminate\Support\Facades\DB;

class ImportService
{
    /**
     * JSON 데이터로 프로젝트, 작업, 이슈 일괄 생성
     */
    public function importFromJson(array $data): array
    {
        return DB::transaction(function () use ($data) {
            $result = [
                'project' => null,
                'tasks_count' => 0,
                'issues_count' => 0,
            ];

            // 1. 프로젝트 생성
            $projectData = $data['project'];
            $project = AdminPmProject::create([
                'name' => $projectData['name'],
                'description' => $projectData['description'] ?? null,
                'status' => $projectData['status'] ?? AdminPmProject::STATUS_ACTIVE,
                'start_date' => $projectData['start_date'] ?? null,
                'end_date' => $projectData['end_date'] ?? null,
                'created_by' => auth()->id(),
            ]);
            $result['project'] = $project;

            // 2. 작업 생성
            $tasks = $data['tasks'] ?? [];
            $sortOrder = 1;

            foreach ($tasks as $taskData) {
                $task = AdminPmTask::create([
                    'project_id' => $project->id,
                    'title' => $taskData['title'],
                    'description' => $taskData['description'] ?? null,
                    'status' => $taskData['status'] ?? AdminPmTask::STATUS_TODO,
                    'priority' => $taskData['priority'] ?? AdminPmTask::PRIORITY_MEDIUM,
                    'due_date' => $taskData['due_date'] ?? null,
                    'sort_order' => $sortOrder++,
                    'created_by' => auth()->id(),
                ]);
                $result['tasks_count']++;

                // 3. 작업별 이슈 생성
                $issues = $taskData['issues'] ?? [];
                foreach ($issues as $issueData) {
                    AdminPmIssue::create([
                        'project_id' => $project->id,
                        'task_id' => $task->id,
                        'title' => $issueData['title'],
                        'description' => $issueData['description'] ?? null,
                        'type' => $issueData['type'] ?? AdminPmIssue::TYPE_BUG,
                        'status' => $issueData['status'] ?? AdminPmIssue::STATUS_OPEN,
                        'start_date' => $issueData['start_date'] ?? null,
                        'due_date' => $issueData['due_date'] ?? null,
                        'estimated_hours' => $issueData['estimated_hours'] ?? null,
                        'is_urgent' => $issueData['is_urgent'] ?? false,
                        // 팀/담당자/고객사 (하이브리드)
                        'department_id' => $issueData['department_id'] ?? null,
                        'team' => $issueData['team'] ?? null,
                        'assignee_id' => $issueData['assignee_id'] ?? null,
                        'assignee_name' => $issueData['assignee_name'] ?? null,
                        'client' => $issueData['client'] ?? null,
                        'created_by' => auth()->id(),
                    ]);
                    $result['issues_count']++;
                }
            }

            return $result;
        });
    }

    /**
     * 기존 프로젝트에 작업/이슈 추가
     */
    public function importTasksToProject(int $projectId, array $tasks): array
    {
        return DB::transaction(function () use ($projectId, $tasks) {
            $project = AdminPmProject::findOrFail($projectId);

            $result = [
                'project_id' => $projectId,
                'tasks_count' => 0,
                'issues_count' => 0,
            ];

            $maxSortOrder = AdminPmTask::where('project_id', $projectId)->max('sort_order') ?? 0;
            $sortOrder = $maxSortOrder + 1;

            foreach ($tasks as $taskData) {
                $task = AdminPmTask::create([
                    'project_id' => $project->id,
                    'title' => $taskData['title'],
                    'description' => $taskData['description'] ?? null,
                    'status' => $taskData['status'] ?? AdminPmTask::STATUS_TODO,
                    'priority' => $taskData['priority'] ?? AdminPmTask::PRIORITY_MEDIUM,
                    'due_date' => $taskData['due_date'] ?? null,
                    'sort_order' => $sortOrder++,
                    'created_by' => auth()->id(),
                ]);
                $result['tasks_count']++;

                $issues = $taskData['issues'] ?? [];
                foreach ($issues as $issueData) {
                    AdminPmIssue::create([
                        'project_id' => $project->id,
                        'task_id' => $task->id,
                        'title' => $issueData['title'],
                        'description' => $issueData['description'] ?? null,
                        'type' => $issueData['type'] ?? AdminPmIssue::TYPE_BUG,
                        'status' => $issueData['status'] ?? AdminPmIssue::STATUS_OPEN,
                        'start_date' => $issueData['start_date'] ?? null,
                        'due_date' => $issueData['due_date'] ?? null,
                        'estimated_hours' => $issueData['estimated_hours'] ?? null,
                        'is_urgent' => $issueData['is_urgent'] ?? false,
                        // 팀/담당자/고객사 (하이브리드)
                        'department_id' => $issueData['department_id'] ?? null,
                        'team' => $issueData['team'] ?? null,
                        'assignee_id' => $issueData['assignee_id'] ?? null,
                        'assignee_name' => $issueData['assignee_name'] ?? null,
                        'client' => $issueData['client'] ?? null,
                        'created_by' => auth()->id(),
                    ]);
                    $result['issues_count']++;
                }
            }

            return $result;
        });
    }

    /**
     * 기존 작업에 이슈만 추가
     */
    public function importIssuesToTask(int $taskId, array $issues): array
    {
        return DB::transaction(function () use ($taskId, $issues) {
            $task = AdminPmTask::findOrFail($taskId);

            $result = [
                'task_id' => $taskId,
                'task_title' => $task->title,
                'project_id' => $task->project_id,
                'issues_count' => 0,
            ];

            foreach ($issues as $issueData) {
                AdminPmIssue::create([
                    'project_id' => $task->project_id,
                    'task_id' => $task->id,
                    'title' => $issueData['title'],
                    'description' => $issueData['description'] ?? null,
                    'type' => $issueData['type'] ?? AdminPmIssue::TYPE_FEATURE,
                    'status' => $issueData['status'] ?? AdminPmIssue::STATUS_OPEN,
                    'start_date' => $issueData['start_date'] ?? null,
                    'due_date' => $issueData['due_date'] ?? null,
                    'estimated_hours' => $issueData['estimated_hours'] ?? null,
                    'is_urgent' => $issueData['is_urgent'] ?? false,
                    // 팀/담당자/고객사 (하이브리드)
                    'department_id' => $issueData['department_id'] ?? null,
                    'team' => $issueData['team'] ?? null,
                    'assignee_id' => $issueData['assignee_id'] ?? null,
                    'assignee_name' => $issueData['assignee_name'] ?? null,
                    'client' => $issueData['client'] ?? null,
                    'created_by' => auth()->id(),
                ]);
                $result['issues_count']++;
            }

            return $result;
        });
    }

    /**
     * JSON 샘플 템플릿 반환
     */
    public function getSampleTemplate(): array
    {
        return [
            'project' => [
                'name' => '프로젝트명 (필수)',
                'description' => '프로젝트 설명 (선택)',
                'status' => 'active',
                'start_date' => date('Y-m-d'),
                'end_date' => date('Y-m-d', strtotime('+3 months')),
            ],
            'tasks' => [
                [
                    'title' => '작업 1 (필수)',
                    'description' => '작업 설명 (선택)',
                    'status' => 'todo',
                    'priority' => 'medium',
                    'due_date' => date('Y-m-d', strtotime('+1 week')),
                    'issues' => [
                        [
                            'title' => '이슈 1',
                            'description' => '이슈 설명',
                            'type' => 'feature',
                            'status' => 'open',
                            'start_date' => date('Y-m-d'),
                            'due_date' => date('Y-m-d', strtotime('+1 week')),
                            'estimated_hours' => 8,
                            'is_urgent' => false,
                            // 방법 1: FK 연동 (DB에 존재하는 ID)
                            'department_id' => null,
                            'assignee_id' => null,
                            // 방법 2: 문자열 직접 입력 (연동 없이)
                            'team' => '개발팀',
                            'assignee_name' => '홍길동',
                            'client' => '경동기업',
                        ],
                    ],
                ],
                [
                    'title' => '작업 2',
                    'status' => 'todo',
                    'priority' => 'high',
                ],
            ],
        ];
    }

    /**
     * JSON 유효성 검사 (FormRequest 전에 미리 체크)
     */
    public function validateJsonStructure(array $data): array
    {
        $errors = [];

        if (! isset($data['project'])) {
            $errors[] = 'project 객체가 필요합니다.';
        } elseif (! isset($data['project']['name']) || empty($data['project']['name'])) {
            $errors[] = 'project.name은 필수입니다.';
        }

        if (isset($data['tasks']) && is_array($data['tasks'])) {
            foreach ($data['tasks'] as $index => $task) {
                if (! isset($task['title']) || empty($task['title'])) {
                    $errors[] = "tasks[{$index}].title은 필수입니다.";
                }

                if (isset($task['issues']) && is_array($task['issues'])) {
                    foreach ($task['issues'] as $issueIndex => $issue) {
                        if (! isset($issue['title']) || empty($issue['title'])) {
                            $errors[] = "tasks[{$index}].issues[{$issueIndex}].title은 필수입니다.";
                        }
                    }
                }
            }
        }

        return $errors;
    }
}