// controllers/workAnalysisController.js

const WorkAnalysis = require('../models/WorkAnalysis');
const { getDb } = require('../dbPool'); // 기존 프로젝트의 DB 연결 방식 사용

class WorkAnalysisController {
    constructor() {
        // 메서드 바인딩
        this.getStats = this.getStats.bind(this);
        this.getDailyTrend = this.getDailyTrend.bind(this);
        this.getWorkerStats = this.getWorkerStats.bind(this);
        this.getProjectStats = this.getProjectStats.bind(this);
        this.getWorkTypeStats = this.getWorkTypeStats.bind(this);
        this.getRecentWork = this.getRecentWork.bind(this);
        this.getWeekdayPattern = this.getWeekdayPattern.bind(this);
        this.getErrorAnalysis = this.getErrorAnalysis.bind(this);
        this.getMonthlyComparison = this.getMonthlyComparison.bind(this);
        this.getWorkerSpecialization = this.getWorkerSpecialization.bind(this);
        this.getProjectWorkTypeAnalysis = this.getProjectWorkTypeAnalysis.bind(this);
    }

    // 날짜 유효성 검사
    validateDateRange(startDate, endDate) {
        if (!startDate || !endDate) {
            throw new Error('시작일과 종료일을 입력해주세요.');
        }

        const start = new Date(startDate);
        const end = new Date(endDate);

        if (isNaN(start.getTime()) || isNaN(end.getTime())) {
            throw new Error('올바른 날짜 형식을 입력해주세요. (YYYY-MM-DD)');
        }

        if (start > end) {
            throw new Error('시작일이 종료일보다 늦을 수 없습니다.');
        }

        // 너무 긴 기간 방지 (1년 제한)
        const diffTime = Math.abs(end - start);
        const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24));
        if (diffDays > 365) {
            throw new Error('조회 기간은 1년을 초과할 수 없습니다.');
        }

        return { start, end };
    }

    // 기본 통계 조회
    async getStats(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const stats = await workAnalysis.getBasicStats(start, end);

            res.status(200).json({
                success: true,
                data: stats,
                message: '기본 통계 조회 완료'
            });

        } catch (error) {
            console.error('기본 통계 조회 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 일별 작업시간 추이
    async getDailyTrend(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const trendData = await workAnalysis.getDailyTrend(start, end);

            res.status(200).json({
                success: true,
                data: trendData,
                message: '일별 추이 조회 완료'
            });

        } catch (error) {
            console.error('일별 추이 조회 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 작업자별 통계
    async getWorkerStats(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const workerStats = await workAnalysis.getWorkerStats(start, end);

            res.status(200).json({
                success: true,
                data: workerStats,
                message: '작업자별 통계 조회 완료'
            });

        } catch (error) {
            console.error('작업자별 통계 조회 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 프로젝트별 통계
    async getProjectStats(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const projectStats = await workAnalysis.getProjectStats(start, end);

            res.status(200).json({
                success: true,
                data: projectStats,
                message: '프로젝트별 통계 조회 완료'
            });

        } catch (error) {
            console.error('프로젝트별 통계 조회 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 작업유형별 통계
    async getWorkTypeStats(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const workTypeStats = await workAnalysis.getWorkTypeStats(start, end);

            res.status(200).json({
                success: true,
                data: workTypeStats,
                message: '작업유형별 통계 조회 완료'
            });

        } catch (error) {
            console.error('작업유형별 통계 조회 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 최근 작업 현황
    async getRecentWork(req, res) {
        try {
            const { start, end, limit = 10 } = req.query;
            this.validateDateRange(start, end);

            // limit 유효성 검사 (최대 5000까지 허용)
            const limitNum = parseInt(limit);
            if (isNaN(limitNum) || limitNum < 1 || limitNum > 5000) {
                throw new Error('limit은 1~5000 사이의 숫자여야 합니다.');
            }

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const recentWork = await workAnalysis.getRecentWork(start, end, limitNum);

            res.status(200).json({
                success: true,
                data: recentWork,
                message: '최근 작업 현황 조회 완료'
            });

        } catch (error) {
            console.error('최근 작업 현황 조회 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 요일별 패턴 분석
    async getWeekdayPattern(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const weekdayPattern = await workAnalysis.getWeekdayPattern(start, end);

            res.status(200).json({
                success: true,
                data: weekdayPattern,
                message: '요일별 패턴 분석 완료'
            });

        } catch (error) {
            console.error('요일별 패턴 분석 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 에러 분석
    async getErrorAnalysis(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const errorAnalysis = await workAnalysis.getErrorAnalysis(start, end);

            res.status(200).json({
                success: true,
                data: errorAnalysis,
                message: '에러 분석 완료'
            });

        } catch (error) {
            console.error('에러 분석 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 월별 비교 분석
    async getMonthlyComparison(req, res) {
        try {
            const { year = new Date().getFullYear() } = req.query;
            
            const yearNum = parseInt(year);
            if (isNaN(yearNum) || yearNum < 2000 || yearNum > 2050) {
                throw new Error('올바른 연도를 입력해주세요. (2000-2050)');
            }

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const monthlyData = await workAnalysis.getMonthlyComparison(yearNum);

            res.status(200).json({
                success: true,
                data: monthlyData,
                message: '월별 비교 분석 완료'
            });

        } catch (error) {
            console.error('월별 비교 분석 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 작업자별 전문분야 분석
    async getWorkerSpecialization(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);
            const specializationData = await workAnalysis.getWorkerSpecialization(start, end);

            // 작업자별로 그룹화하여 정리
            const groupedData = specializationData.reduce((acc, item) => {
                if (!acc[item.worker_id]) {
                    acc[item.worker_id] = [];
                }
                acc[item.worker_id].push({
                    work_type_id: item.work_type_id,
                    project_id: item.project_id,
                    totalHours: item.totalHours,
                    totalReports: item.totalReports,
                    percentage: item.percentage
                });
                return acc;
            }, {});

            res.status(200).json({
                success: true,
                data: groupedData,
                message: '작업자별 전문분야 분석 완료'
            });

        } catch (error) {
            console.error('작업자별 전문분야 분석 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 대시보드용 종합 데이터
    async getDashboardData(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            const workAnalysis = new WorkAnalysis(db);

            // 병렬로 여러 데이터 조회
            const [
                stats,
                dailyTrend,
                workerStats,
                projectStats,
                workTypeStats,
                recentWork
            ] = await Promise.all([
                workAnalysis.getBasicStats(start, end),
                workAnalysis.getDailyTrend(start, end),
                workAnalysis.getWorkerStats(start, end),
                workAnalysis.getProjectStats(start, end),
                workAnalysis.getWorkTypeStats(start, end),
                workAnalysis.getRecentWork(start, end, 10)
            ]);

            res.status(200).json({
                success: true,
                data: {
                    stats,
                    dailyTrend,
                    workerStats,
                    projectStats,
                    workTypeStats,
                    recentWork
                },
                message: '대시보드 데이터 조회 완료'
            });

        } catch (error) {
            console.error('대시보드 데이터 조회 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }

    // 프로젝트별-작업별 시간 분석 (총시간, 정규시간, 에러시간)
    async getProjectWorkTypeAnalysis(req, res) {
        try {
            const { start, end } = req.query;
            this.validateDateRange(start, end);

            const db = await getDb();
            
            // 먼저 데이터 존재 여부 확인
            const testQuery = `
                SELECT 
                    COUNT(*) as total_count,
                    MIN(report_date) as min_date,
                    MAX(report_date) as max_date,
                    SUM(work_hours) as total_hours
                FROM daily_work_reports 
                WHERE report_date BETWEEN ? AND ?
            `;
            
            const testResults = await db.query(testQuery, [start, end]);
            console.log('📊 데이터 확인:', testResults[0]);
            
            // 먼저 간단한 테스트 쿼리로 데이터 확인
            const simpleQuery = `
                SELECT COUNT(*) as count, MIN(report_date) as min_date, MAX(report_date) as max_date
                FROM daily_work_reports 
                WHERE report_date BETWEEN ? AND ?
            `;
            
            const simpleResult = await db.query(simpleQuery, [start, end]);
            console.log('📊 기간 내 데이터 확인:', simpleResult[0][0]);
            
            // 프로젝트별-작업별 시간 분석 쿼리 (work_types 테이블과 조인)
            const query = `
                SELECT 
                    COALESCE(p.project_id, dwr.project_id) as project_id,
                    COALESCE(p.project_name, CONCAT('프로젝트 ', dwr.project_id)) as project_name,
                    COALESCE(p.job_no, 'N/A') as job_no,
                    dwr.work_type_id,
                    COALESCE(wt.name, CONCAT('작업유형 ', dwr.work_type_id)) as work_type_name,
                    
                    -- 총 시간
                    SUM(dwr.work_hours) as total_hours,
                    
                    -- 정규 시간 (work_status_id = 1)
                    SUM(CASE WHEN dwr.work_status_id = 1 THEN dwr.work_hours ELSE 0 END) as regular_hours,
                    
                    -- 에러 시간 (work_status_id = 2)
                    SUM(CASE WHEN dwr.work_status_id = 2 THEN dwr.work_hours ELSE 0 END) as error_hours,
                    
                    -- 작업 건수
                    COUNT(*) as total_reports,
                    COUNT(CASE WHEN dwr.work_status_id = 1 THEN 1 END) as regular_reports,
                    COUNT(CASE WHEN dwr.work_status_id = 2 THEN 1 END) as error_reports,
                    
                    -- 에러율 계산
                    ROUND(
                        (SUM(CASE WHEN dwr.work_status_id = 2 THEN dwr.work_hours ELSE 0 END) / 
                         SUM(dwr.work_hours)) * 100, 2
                    ) as error_rate_percent
                    
                FROM daily_work_reports dwr
                LEFT JOIN projects p ON dwr.project_id = p.project_id
                LEFT JOIN work_types wt ON dwr.work_type_id = wt.id
                WHERE dwr.report_date BETWEEN ? AND ?
                GROUP BY dwr.project_id, p.project_name, p.job_no, dwr.work_type_id, wt.name
                ORDER BY p.project_name, wt.name
            `;

            const results = await db.query(query, [start, end]);
            console.log('📊 쿼리 결과 개수:', results[0].length);
            console.log('📊 첫 번째 결과:', results[0][0]);
            console.log('📊 모든 결과:', JSON.stringify(results[0], null, 2));

            // 데이터를 프로젝트별로 그룹화
            const groupedData = {};
            
            results[0].forEach(row => {
                const projectKey = `${row.project_id}_${row.project_name}`;
                
                if (!groupedData[projectKey]) {
                    groupedData[projectKey] = {
                        project_id: row.project_id,
                        project_name: row.project_name,
                        job_no: row.job_no,
                        total_project_hours: 0,
                        total_regular_hours: 0,
                        total_error_hours: 0,
                        work_types: []
                    };
                }
                
                // 프로젝트 총계 누적
                groupedData[projectKey].total_project_hours += parseFloat(row.total_hours);
                groupedData[projectKey].total_regular_hours += parseFloat(row.regular_hours);
                groupedData[projectKey].total_error_hours += parseFloat(row.error_hours);
                
                // 작업 유형별 데이터 추가
                groupedData[projectKey].work_types.push({
                    work_type_id: row.work_type_id,
                    work_type_name: row.work_type_name,
                    total_hours: parseFloat(row.total_hours),
                    regular_hours: parseFloat(row.regular_hours),
                    error_hours: parseFloat(row.error_hours),
                    total_reports: row.total_reports,
                    regular_reports: row.regular_reports,
                    error_reports: row.error_reports,
                    error_rate_percent: parseFloat(row.error_rate_percent) || 0
                });
            });

            // 프로젝트별 에러율 계산
            Object.values(groupedData).forEach(project => {
                project.project_error_rate = project.total_project_hours > 0 
                    ? Math.round((project.total_error_hours / project.total_project_hours) * 100 * 100) / 100
                    : 0;
            });

            // 전체 요약 통계
            const totalStats = {
                total_projects: Object.keys(groupedData).length,
                total_work_types: new Set(results[0].map(r => r.work_type_id)).size,
                grand_total_hours: Object.values(groupedData).reduce((sum, p) => sum + p.total_project_hours, 0),
                grand_regular_hours: Object.values(groupedData).reduce((sum, p) => sum + p.total_regular_hours, 0),
                grand_error_hours: Object.values(groupedData).reduce((sum, p) => sum + p.total_error_hours, 0)
            };
            
            totalStats.grand_error_rate = totalStats.grand_total_hours > 0 
                ? Math.round((totalStats.grand_error_hours / totalStats.grand_total_hours) * 100 * 100) / 100
                : 0;

            res.status(200).json({
                success: true,
                data: {
                    summary: totalStats,
                    projects: Object.values(groupedData),
                    period: { start, end }
                },
                message: '프로젝트별-작업별 시간 분석 완료'
            });

        } catch (error) {
            console.error('프로젝트별-작업별 시간 분석 오류:', error);
            res.status(400).json({
                success: false,
                error: error.message
            });
        }
    }
}

module.exports = new WorkAnalysisController();