<?php
declare (strict_types = 1);

namespace app\service;

/**
 * 岗位简历匹配度计算服务
 * 采用硬性条件一票否决 + 软性条件加分机制
 */
class MatchService
{
    /**
     * 计算岗位和简历的匹配度
     * @param array $position 岗位信息
     * @param array $resume 简历信息
     * @return int 匹配度分数（0-100分），硬性条件不满足返回0分
     */
    public function calculateMatchScore(array $position, array $resume): int
    {
        // 第一步：检查硬性条件（一票否决）
        $hardCheck = $this->checkHardRequirements($position, $resume);
        
        if (!$hardCheck['passed']) {
            return 0; // 硬性条件不满足，直接返回0分
        }
        
        // 第二步：计算软性条件匹配度（100分制）
        $softCheck = $this->calculateSoftRequirements($position, $resume);
        
        return $softCheck['score'];
    }
    
    /**
     * 检查硬性条件（一票否决机制）
     * @param array $position 岗位信息
     * @param array $resume 简历信息
     * @return array
     */
    private function checkHardRequirements(array $position, array $resume): array
    {
        $positionRequire = $position['position_require'] ?? [];
        $result = [
            'passed' => true,
            'rejection_reasons' => [],
            'details' => []
        ];
        
        // 1. 学历要求（硬性）
        if (!empty($positionRequire['学历要求'])) {
            $educationCheck = $this->checkEducation($positionRequire['学历要求'], $resume);
            $result['details']['学历要求'] = $educationCheck;
            if (!$educationCheck['passed']) {
                $result['passed'] = false;
                $result['rejection_reasons'][] = $educationCheck['reason'];
            }
        }
        
        // 2. 学位要求（硬性）
        if (!empty($positionRequire['学位要求'])) {
            $degreeCheck = $this->checkDegree($positionRequire['学位要求'], $resume);
            $result['details']['学位要求'] = $degreeCheck;
            if (!$degreeCheck['passed']) {
                $result['passed'] = false;
                $result['rejection_reasons'][] = $degreeCheck['reason'];
            }
        }
        
        // 3. 年龄要求（硬性）
        if (!empty($positionRequire['年龄要求'])) {
            $ageCheck = $this->checkAge($positionRequire['年龄要求'], $resume);
            $result['details']['年龄要求'] = $ageCheck;
            if (!$ageCheck['passed']) {
                $result['passed'] = false;
                $result['rejection_reasons'][] = $ageCheck['reason'];
            }
        }
        
        // 4. 专业要求（硬性）
        if (!empty($positionRequire['专业（学科）类别'])) {
            $majorCheck = $this->checkMajor($positionRequire['专业（学科）类别'], $resume);
            $result['details']['专业要求'] = $majorCheck;
            if (!$majorCheck['passed']) {
                $result['passed'] = false;
                $result['rejection_reasons'][] = $majorCheck['reason'];
            }
        }
        
        // 5. 性别要求（硬性，如果明确要求）
        $otherConditions = $positionRequire['其他资格条件'] ?? '';
        if (preg_match('/适合(男|女)性/u', $otherConditions, $matches)) {
            $genderCheck = $this->checkGender($matches[1], $resume);
            $result['details']['性别要求'] = $genderCheck;
            if (!$genderCheck['passed']) {
                $result['passed'] = false;
                $result['rejection_reasons'][] = $genderCheck['reason'];
            }
        }
        
        return $result;
    }
    
    /**
     * 计算软性条件匹配度（100分制）
     * @param array $position 岗位信息
     * @param array $resume 简历信息
     * @return array
     */
    private function calculateSoftRequirements(array $position, array $resume): array
    {
        $positionRequire = $position['position_require'] ?? [];
        $score = 0;
        $details = [];
        $maxScore = 100;
        
        // 1. 专业匹配度（40分）- 即使专业类别符合，也可以根据专业相关性打分
        $majorScore = $this->scoreMajorMatch($positionRequire['专业（学科）类别'] ?? '', $resume);
        $score += $majorScore['score'];
        $details['专业匹配度'] = $majorScore;
        
        // 2. 学历层次匹配度（20分）- 超过要求的学历可以加分
        $educationScore = $this->scoreEducationLevel($positionRequire['学历要求'] ?? '', $resume);
        $score += $educationScore['score'];
        $details['学历层次匹配度'] = $educationScore;
        
        // 3. 专业资格条件（20分）- 竞赛获奖等
        $qualificationScore = $this->scoreQualification($positionRequire['专业资格条件'] ?? '', $resume);
        $score += $qualificationScore['score'];
        $details['专业资格条件'] = $qualificationScore;
        
        // 4. 基层工作经历（10分）
        $workExpScore = $this->scoreWorkExperience($resume);
        $score += $workExpScore['score'];
        $details['基层工作经历'] = $workExpScore;
        
        // 5. 其他条件匹配（10分）- 如政治面貌、特殊身份等
        $otherScore = $this->scoreOtherConditions($positionRequire['其他资格条件'] ?? '', $resume);
        $score += $otherScore['score'];
        $details['其他条件'] = $otherScore;
        
        return [
            'score' => min(100, $score),
            'max_score' => $maxScore,
            'details' => $details
        ];
    }
    
    // ==================== 硬性条件检查方法 ====================
    
    /**
     * 检查学历要求（硬性）
     */
    private function checkEducation(string $requirement, array $resume): array
    {
        $educations = $resume['education'] ?? [];
        if (empty($educations)) {
            return [
                'passed' => false,
                'reason' => '未提供学历信息',
                'required' => $requirement,
                'actual' => null
            ];
        }
        
        $highestEducation = $this->getHighestEducation($educations);
        if (empty($highestEducation)) {
            return [
                'passed' => false,
                'reason' => '无法识别最高学历',
                'required' => $requirement,
                'actual' => null
            ];
        }
        
        $educationLevel = $highestEducation['education_level'] ?? '';
        $educationLevels = [
            '普通本科' => 3,
            '硕士研究生' => 4,
            '博士研究生' => 5,
        ];
        
        $requireLevel = $this->parseEducationRequire($requirement);
        $actualLevel = $educationLevels[$educationLevel] ?? 0;
        
        if ($actualLevel >= $requireLevel) {
            return [
                'passed' => true,
                'required' => $requirement,
                'actual' => $educationLevel
            ];
        }
        
        return [
            'passed' => false,
            'reason' => "学历不符合要求：需要{$requirement}，实际为{$educationLevel}",
            'required' => $requirement,
            'actual' => $educationLevel
        ];
    }
    
    /**
     * 检查学位要求（硬性）
     */
    private function checkDegree(string $requirement, array $resume): array
    {
        $educations = $resume['education'] ?? [];
        if (empty($educations)) {
            return [
                'passed' => false,
                'reason' => '未提供学位信息',
                'required' => $requirement,
                'actual' => null
            ];
        }
        
        $highestEducation = $this->getHighestEducation($educations);
        $degree = $highestEducation['degree'] ?? '';
        
        $degreeLevels = [
            '学士' => 1,
            '硕士' => 2,
            '博士' => 3,
        ];
        
        $requireLevel = $this->parseDegreeRequire($requirement);
        $actualLevel = $degreeLevels[$degree] ?? 0;
        
        if ($actualLevel >= $requireLevel) {
            return [
                'passed' => true,
                'required' => $requirement,
                'actual' => $degree
            ];
        }
        
        return [
            'passed' => false,
            'reason' => "学位不符合要求：需要{$requirement}，实际为{$degree}",
            'required' => $requirement,
            'actual' => $degree
        ];
    }
    
    /**
     * 检查年龄要求（硬性）
     */
    private function checkAge(string $requirement, array $resume): array
    {
        $birthDate = $resume['birth_date'] ?? '';
        if (empty($birthDate)) {
            return [
                'passed' => false,
                'reason' => '未提供出生日期',
                'required' => $requirement,
                'actual' => null
            ];
        }
        
        $age = $this->calculateAge($birthDate);
        
        if (preg_match('/(\d+)周岁以上.*?(\d+)周岁以下/u', $requirement, $matches)) {
            $minAge = (int)$matches[1];
            $maxAge = (int)$matches[2];
            
            if ($age >= $minAge && $age <= $maxAge) {
                return [
                    'passed' => true,
                    'required' => $requirement,
                    'actual' => "{$age}岁"
                ];
            }
            
            return [
                'passed' => false,
                'reason' => "年龄不符合要求：需要{$minAge}-{$maxAge}岁，实际为{$age}岁",
                'required' => $requirement,
                'actual' => "{$age}岁"
            ];
        }
        
        return [
            'passed' => false,
            'reason' => '无法解析年龄要求格式',
            'required' => $requirement,
            'actual' => "{$age}岁"
        ];
    }
    
    /**
     * 检查专业要求（硬性）
     */
    private function checkMajor(string $requirement, array $resume): array
    {
        $educations = $resume['education'] ?? [];
        if (empty($educations)) {
            return [
                'passed' => false,
                'reason' => '未提供专业信息',
                'required' => $requirement,
                'actual' => null
            ];
        }
        
        $matchedMajors = [];
        foreach ($educations as $education) {
            $majorName = $education['majors_name'] ?? '';
            if ($this->isMajorCategoryMatch($majorName, $requirement)) {
                $matchedMajors[] = $majorName;
            }
        }
        
        if (!empty($matchedMajors)) {
            return [
                'passed' => true,
                'required' => $requirement,
                'actual' => implode('、', $matchedMajors)
            ];
        }
        
        $actualMajors = array_map(function($edu) {
            return $edu['majors_name'] ?? '';
        }, $educations);
        $actualMajors = array_filter($actualMajors);
        
        return [
            'passed' => false,
            'reason' => "专业不符合要求：需要{$requirement}，实际为" . implode('、', $actualMajors),
            'required' => $requirement,
            'actual' => implode('、', $actualMajors)
        ];
    }
    
    /**
     * 检查性别要求（硬性）
     */
    private function checkGender(string $requireGender, array $resume): array
    {
        $gender = $resume['gender'] ?? '';
        if ($gender === $requireGender) {
            return [
                'passed' => true,
                'required' => $requireGender,
                'actual' => $gender
            ];
        }
        
        return [
            'passed' => false,
            'reason' => "性别不符合要求：需要{$requireGender}，实际为{$gender}",
            'required' => $requireGender,
            'actual' => $gender
        ];
    }
    
    // ==================== 软性条件评分方法 ====================
    
    /**
     * 专业匹配度评分（40分）
     */
    private function scoreMajorMatch(string $requirement, array $resume): array
    {
        if (empty($requirement)) {
            return ['score' => 40, 'reason' => '无专业要求'];
        }
        
        $educations = $resume['education'] ?? [];
        if (empty($educations)) {
            return ['score' => 0, 'reason' => '无专业信息'];
        }
        
        $maxScore = 0;
        foreach ($educations as $education) {
            $majorName = $education['majors_name'] ?? '';
            $score = $this->calculateMajorRelevanceScore($majorName, $requirement);
            $maxScore = max($maxScore, $score);
        }
        
        return [
            'score' => min(40, $maxScore),
            'max_score' => 40,
            'reason' => $maxScore >= 40 ? '专业高度匹配' : '专业部分匹配'
        ];
    }
    
    /**
     * 学历层次匹配度评分（20分）
     */
    private function scoreEducationLevel(string $requirement, array $resume): array
    {
        $educations = $resume['education'] ?? [];
        if (empty($educations)) {
            return ['score' => 0, 'reason' => '无学历信息'];
        }
        
        $highestEducation = $this->getHighestEducation($educations);
        $educationLevel = $highestEducation['education_level'] ?? '';
        
        $educationLevels = [
            '普通本科' => 3,
            '硕士研究生' => 4,
            '博士研究生' => 5,
        ];
        
        $requireLevel = $this->parseEducationRequire($requirement);
        $actualLevel = $educationLevels[$educationLevel] ?? 0;
        
        // 刚好满足要求：15分，超过一级：20分，超过两级及以上：20分
        if ($actualLevel == $requireLevel) {
            return ['score' => 15, 'max_score' => 20, 'reason' => '刚好满足要求'];
        } elseif ($actualLevel > $requireLevel) {
            $exceed = $actualLevel - $requireLevel;
            return [
                'score' => 15 + min(5, $exceed * 5),
                'max_score' => 20,
                'reason' => "超过要求{$exceed}级"
            ];
        }
        
        return ['score' => 0, 'reason' => '未达到要求'];
    }
    
    /**
     * 专业资格条件评分（20分）
     */
    private function scoreQualification(string $requirement, array $resume): array
    {
        if (empty($requirement)) {
            return [
                'score' => 20,
                'max_score' => 20,
                'reason' => '无专业资格要求'
            ];
        }
        
        // 这里可以根据简历中的证书、获奖等信息来评分
        // 由于当前简历数据结构中没有这些字段，暂时返回基础分数
        // 实际应用中需要扩展简历数据结构
        
        return [
            'score' => 0,
            'max_score' => 20,
            'reason' => '未提供专业资格证明材料（需扩展简历数据结构）'
        ];
    }
    
    /**
     * 基层工作经历评分（10分）
     */
    private function scoreWorkExperience(array $resume): array
    {
        $workExperience = $resume['work_experience'] ?? '';
        
        if (empty($workExperience) || strpos($workExperience, '无') !== false) {
            return [
                'score' => 0,
                'max_score' => 10,
                'reason' => '无基层工作经历'
            ];
        }
        
        // 可以根据工作年限进一步细化评分
        return [
            'score' => 10,
            'max_score' => 10,
            'reason' => '有基层工作经历'
        ];
    }
    
    /**
     * 其他条件评分（10分）
     */
    private function scoreOtherConditions(string $requirement, array $resume): array
    {
        if (empty($requirement)) {
            return ['score' => 10, 'reason' => '无其他条件要求'];
        }
        
        $score = 0;
        $maxScore = 10;
        
        // 政治面貌等可以根据岗位要求评分
        // 当前暂不实现，返回基础分数
        
        return [
            'score' => 10,
            'max_score' => $maxScore,
            'reason' => '其他条件匹配（需根据具体岗位要求细化）'
        ];
    }
    
    // ==================== 辅助方法 ====================
    
    /**
     * 计算年龄
     */
    private function calculateAge(string $birthDate): int
    {
        $birthTimestamp = strtotime($birthDate);
        $currentTimestamp = time();
        $age = date('Y', $currentTimestamp) - date('Y', $birthTimestamp);
        if (date('md', $currentTimestamp) < date('md', $birthTimestamp)) {
            $age--;
        }
        return $age;
    }
    
    /**
     * 获取最高学历
     */
    private function getHighestEducation(array $educations): ?array
    {
        if (empty($educations)) {
            return null;
        }
        
        $educationLevels = [
            '普通本科' => 3,
            '硕士研究生' => 4,
            '博士研究生' => 5,
        ];
        
        $highest = null;
        $highestLevel = 0;
        
        foreach ($educations as $education) {
            $level = $educationLevels[$education['education_level'] ?? ''] ?? 0;
            if ($level > $highestLevel) {
                $highestLevel = $level;
                $highest = $education;
            }
        }
        
        return $highest;
    }
    
    /**
     * 解析学历要求
     */
    private function parseEducationRequire(string $require): int
    {
        if (strpos($require, '本科') !== false) {
            return 3;
        }
        if (strpos($require, '硕士') !== false) {
            return 4;
        }
        if (strpos($require, '博士') !== false) {
            return 5;
        }
        return 0;
    }
    
    /**
     * 解析学位要求
     */
    private function parseDegreeRequire(string $require): int
    {
        if (strpos($require, '学士') !== false) {
            return 1;
        }
        if (strpos($require, '硕士') !== false) {
            return 2;
        }
        if (strpos($require, '博士') !== false) {
            return 3;
        }
        return 0;
    }
    
    /**
     * 判断专业类别是否匹配（硬性检查）
     */
    private function isMajorCategoryMatch(string $majorName, string $majorRequire): bool
    {
        if (empty($majorName) || empty($majorRequire)) {
            return false;
        }
        
        $requireCategories = explode('，', $majorRequire);
        
        foreach ($requireCategories as $category) {
            $category = trim($category);
            
            // 计算机科学与技术类
            if (strpos($category, '计算机') !== false) {
                $computerKeywords = ['计算机', '软件', '网络', '信息', '数据', '人工智能', '大数据', '网络安全', '信息安全'];
                foreach ($computerKeywords as $keyword) {
                    if (strpos($majorName, $keyword) !== false) {
                        return true;
                    }
                }
            }
            
            // 电气、电子及自动化类
            if (strpos($category, '电气') !== false || strpos($category, '电子') !== false || strpos($category, '自动化') !== false) {
                $electronicsKeywords = ['电气', '电子', '自动化', '通信', '电信', '电子信息'];
                foreach ($electronicsKeywords as $keyword) {
                    if (strpos($majorName, $keyword) !== false) {
                        return true;
                    }
                }
            }
        }
        
        return false;
    }
    
    /**
     * 计算专业相关性分数（软性评分）
     */
    private function calculateMajorRelevanceScore(string $majorName, string $majorRequire): int
    {
        if ($this->isMajorCategoryMatch($majorName, $majorRequire)) {
            return 40; // 完全匹配
        }
        
        // 可以根据专业相似度进一步细化评分
        // 这里简单返回0分
        return 0;
    }
}