<?php

namespace app\api\controller;

use app\common\controller\Api;
use app\common\service\AiMeasurementService;
use app\common\service\BodyProfileService;
use app\api\validate\BodyProfile as BodyProfileValidate;
use think\Cache;

/**
 * AI测量API控制器
 */
class AiMeasurement extends Api
{
    protected $noNeedLogin = [];
    protected $noNeedRight = '*';

    /**
     * 开始AI身体测量分析
     */
    public function startAnalysis()
    {
        $params = $this->request->post();
        
        // 验证必要参数
        if (empty($params['profile_id'])) {
            $this->error('档案ID不能为空');
        }

        if (empty($params['photos']) || !is_array($params['photos'])) {
            $this->error('请上传身体照片');
        }

        try {
            // 验证档案归属
            $profile = \app\common\model\BodyProfile::where('id', $params['profile_id'])
                ->where('user_id', $this->auth->id)
                ->find();

            if (!$profile) {
                $this->error('档案不存在');
            }

            // 检查是否有正在处理的任务
            $existingTask = \think\Db::table('fa_ai_measurement_task')
                ->where('profile_id', $params['profile_id'])
                ->where('status', 'in', [0, 1]) // 待处理或处理中
                ->find();

            if ($existingTask) {
                $this->error('该档案已有正在处理的AI测量任务，请稍后再试');
            }

            // 验证照片格式
            $requiredPhotos = ['front', 'side', 'back'];
            foreach ($requiredPhotos as $angle) {
                if (empty($params['photos'][$angle])) {
                    $this->error("请上传{$angle}角度的身体照片");
                }
            }

            // 创建AI测量任务
            $taskData = [
                'profile_id' => $params['profile_id'],
                'user_id' => $this->auth->id,
                'photos' => json_encode($params['photos']),
                'params' => json_encode([
                    'gender' => $profile->gender,
                    'height' => $profile->height,
                    'weight' => $profile->weight
                ]),
                'priority' => $params['priority'] ?? 5,
                'status' => 0, // 待处理
                'createtime' => time(),
                'updatetime' => time()
            ];

            $taskId = \think\Db::table('fa_ai_measurement_task')->insertGetId($taskData);

            // 立即处理任务（也可以放到队列中异步处理）
            $this->processTask($taskId);

            $this->success('AI测量分析已开始', [
                'task_id' => $taskId,
                'estimated_time' => 30 // 预计处理时间(秒)
            ]);

        } catch (\Exception $e) {
            $this->error($e->getMessage());
        }
    }

    /**
     * 获取AI测量结果
     */
    public function getResult()
    {
        $taskId = $this->request->get('task_id/d');
        $profileId = $this->request->get('profile_id/d');

        if (!$taskId && !$profileId) {
            $this->error('任务ID或档案ID不能为空');
        }

        try {
            $query = \think\Db::table('fa_ai_measurement_task')
                ->where('user_id', $this->auth->id);

            if ($taskId) {
                $query->where('id', $taskId);
            } else {
                $query->where('profile_id', $profileId)->order('id DESC');
            }

            $task = $query->find();

            if (!$task) {
                $this->error('任务不存在');
            }

            // 根据任务状态返回不同结果
            switch ($task['status']) {
                case 0: // 待处理
                    $this->success('任务排队中', [
                        'status' => 'pending',
                        'message' => '任务正在排队等待处理'
                    ]);
                    break;

                case 1: // 处理中
                    $this->success('正在分析中', [
                        'status' => 'processing',
                        'message' => 'AI正在分析您的身体照片，请稍候...',
                        'progress' => $this->estimateProgress($task)
                    ]);
                    break;

                case 2: // 完成
                    $result = json_decode($task['result'], true);
                    $this->success('分析完成', [
                        'status' => 'completed',
                        'data' => $this->formatMeasurementResult($result, $task['profile_id'])
                    ]);
                    break;

                case 3: // 失败
                    $this->success('分析失败', [
                        'status' => 'failed',
                        'message' => $task['error_message'] ?: '分析过程中出现错误',
                        'can_retry' => $task['attempts'] < $task['max_attempts']
                    ]);
                    break;

                default:
                    $this->error('未知的任务状态');
            }

        } catch (\Exception $e) {
            $this->error($e->getMessage());
        }
    }

    /**
     * 保存AI测量结果
     */
    public function saveResult()
    {
        $params = $this->request->post();
        
        if (empty($params['task_id'])) {
            $this->error('任务ID不能为空');
        }

        try {
            // 获取任务信息
            $task = \think\Db::table('fa_ai_measurement_task')
                ->where('id', $params['task_id'])
                ->where('user_id', $this->auth->id)
                ->where('status', 2) // 只有完成的任务才能保存
                ->find();

            if (!$task) {
                $this->error('任务不存在或未完成');
            }

            $result = json_decode($task['result'], true);
            if (!$result || !isset($result['measurements'])) {
                $this->error('测量结果数据异常');
            }

            // 保存测量数据
            $measurement = AiMeasurementService::saveMeasurementResult(
                $task['profile_id'],
                $result['measurements'],
                json_decode($task['photos'], true),
                $result['confidence'] ?? null
            );

            $this->success('测量结果已保存', [
                'measurement_id' => $measurement->id
            ]);

        } catch (\Exception $e) {
            $this->error($e->getMessage());
        }
    }

    /**
     * 重新分析
     */
    public function retryAnalysis()
    {
        $taskId = $this->request->post('task_id/d');

        if (!$taskId) {
            $this->error('任务ID不能为空');
        }

        try {
            $task = \think\Db::table('fa_ai_measurement_task')
                ->where('id', $taskId)
                ->where('user_id', $this->auth->id)
                ->where('status', 3) // 失败的任务
                ->find();

            if (!$task) {
                $this->error('任务不存在或不允许重试');
            }

            if ($task['attempts'] >= $task['max_attempts']) {
                $this->error('重试次数已达上限');
            }

            // 重置任务状态
            \think\Db::table('fa_ai_measurement_task')
                ->where('id', $taskId)
                ->update([
                    'status' => 0,
                    'error_message' => '',
                    'updatetime' => time()
                ]);

            // 重新处理任务
            $this->processTask($taskId);

            $this->success('已重新开始分析');

        } catch (\Exception $e) {
            $this->error($e->getMessage());
        }
    }

    /**
     * 获取测量字段配置
     */
    public function getMeasurementConfig()
    {
        $gender = $this->request->get('gender/d', 1);

        try {
            $config = AiMeasurementService::getMeasurementDisplayConfig($gender);
            $this->success('获取成功', $config);
        } catch (\Exception $e) {
            $this->error($e->getMessage());
        }
    }

    /**
     * 处理AI测量任务
     */
    private function processTask($taskId)
    {
        try {
            // 更新任务状态为处理中
            \think\Db::table('fa_ai_measurement_task')
                ->where('id', $taskId)
                ->update([
                    'status' => 1,
                    'started_at' => time(),
                    'attempts' => \think\Db::raw('attempts + 1'),
                    'updatetime' => time()
                ]);

            // 获取任务详情
            $task = \think\Db::table('fa_ai_measurement_task')->where('id', $taskId)->find();
            $photos = json_decode($task['photos'], true);
            $params = json_decode($task['params'], true);

            // 调用AI分析服务
            $measurements = AiMeasurementService::analyzBodyPhotos(
                $photos,
                $params['gender'],
                $params['height'],
                $params['weight']
            );

            // 处理结果
            $result = [
                'measurements' => $measurements,
                'confidence' => $measurements['_confidence'] ?? 0.8,
                'warnings' => $measurements['_warnings'] ?? []
            ];

            // 清理内部字段
            unset($result['measurements']['_confidence']);
            unset($result['measurements']['_warnings']);

            // 更新任务状态为完成
            \think\Db::table('fa_ai_measurement_task')
                ->where('id', $taskId)
                ->update([
                    'status' => 2,
                    'result' => json_encode($result),
                    'completed_at' => time(),
                    'updatetime' => time()
                ]);

        } catch (\Exception $e) {
            // 更新任务状态为失败
            \think\Db::table('fa_ai_measurement_task')
                ->where('id', $taskId)
                ->update([
                    'status' => 3,
                    'error_message' => $e->getMessage(),
                    'updatetime' => time()
                ]);
        }
    }

    /**
     * 估算处理进度
     */
    private function estimateProgress($task)
    {
        $startTime = $task['started_at'];
        $currentTime = time();
        $elapsedTime = $currentTime - $startTime;

        // 假设总处理时间为30秒
        $totalTime = 30;
        $progress = min(95, ($elapsedTime / $totalTime) * 100);

        return round($progress);
    }

    /**
     * 格式化测量结果用于展示
     */
    private function formatMeasurementResult($result, $profileId)
    {
        $profile = \app\common\model\BodyProfile::find($profileId);
        $measurements = $result['measurements'];

        // 获取显示配置
        $displayConfig = AiMeasurementService::getMeasurementDisplayConfig($profile->gender);

        // 格式化数据
        $formattedData = [
            'profile' => [
                'id' => $profile->id,
                'name' => $profile->profile_name,
                'gender' => $profile->gender,
                'height' => $profile->height,
                'weight' => $profile->weight
            ],
            'measurements' => [],
            'display_config' => $displayConfig,
            'confidence' => $result['confidence'] ?? 0,
            'warnings' => $result['warnings'] ?? []
        ];

        // 组织测量数据
        foreach ($displayConfig as $field => $config) {
            $value = isset($measurements[$field]) && $measurements[$field] > 0 
                ? $measurements[$field] 
                : null;

            $formattedData['measurements'][$field] = [
                'label' => $config['label'],
                'value' => $value,
                'unit' => 'cm',
                'position' => $config['position'],
                'side' => $config['side']
            ];
        }

        // 添加基础数据表格
        $formattedData['basic_data'] = [
            ['label' => '身高', 'value' => $profile->height, 'unit' => 'cm'],
            ['label' => '体重', 'value' => $profile->weight, 'unit' => 'kg'],
        ];

        // 添加测量数据表格
        $tableData = [];
        $fields = array_keys($measurements);
        $chunks = array_chunk($fields, 2);

        foreach ($chunks as $chunk) {
            $row = [];
            foreach ($chunk as $field) {
                if (isset($displayConfig[$field])) {
                    $row[] = [
                        'label' => $displayConfig[$field]['label'],
                        'value' => $measurements[$field] ?? null,
                        'unit' => 'cm'
                    ];
                }
            }
            if (!empty($row)) {
                $tableData[] = $row;
            }
        }

        $formattedData['table_data'] = $tableData;

        return $formattedData;
    }
}