# 自然写教学数据分析与学情诊断系统软件 V1.0
# report/report_generator.py - 学情报告生成引擎

import logging
import json
import hashlib
from typing import Any, Dict, List, Optional
from datetime import datetime, date, timedelta
from dataclasses import dataclass, field
from enum import Enum

logger = logging.getLogger("writech.analytics.report")


# ============================================================
#  报告类型与模型
# ============================================================

class ReportType(str, Enum):
    """报告类型枚举"""
    STUDENT_WEEKLY = "student_weekly"      # 学生周报
    STUDENT_MONTHLY = "student_monthly"    # 学生月报
    CLASS_WEEKLY = "class_weekly"          # 班级周报
    CLASS_MONTHLY = "class_monthly"        # 班级月报
    EXAM_ANALYSIS = "exam_analysis"        # 考试分析报告
    WRITING_GROWTH = "writing_growth"      # 书写成长报告
    PARENT_PUSH = "parent_push"            # 家长推送报告


class ReportFormat(str, Enum):
    """报告输出格式"""
    JSON = "json"
    PDF = "pdf"
    HTML = "html"


@dataclass
class ReportSection:
    """报告章节"""
    title: str
    section_type: str  # summary/chart/table/text/recommendation
    content: Dict[str, Any] = field(default_factory=dict)
    order: int = 0


@dataclass
class ReportConfig:
    """报告生成配置"""
    report_type: ReportType
    target_id: str          # 学生ID或班级ID
    start_date: str
    end_date: str
    output_format: ReportFormat = ReportFormat.JSON
    include_charts: bool = True
    include_recommendations: bool = True
    language: str = "zh-CN"


@dataclass
class GeneratedReport:
    """生成的报告"""
    report_id: str
    report_type: ReportType
    target_id: str
    title: str
    period: str
    sections: List[ReportSection]
    summary: str = ""
    generated_at: str = ""
    file_path: Optional[str] = None

    def to_json(self) -> Dict[str, Any]:
        """序列化为JSON"""
        return {
            "report_id": self.report_id,
            "report_type": self.report_type.value,
            "target_id": self.target_id,
            "title": self.title,
            "period": self.period,
            "summary": self.summary,
            "sections": [
                {
                    "title": s.title,
                    "type": s.section_type,
                    "content": s.content,
                    "order": s.order,
                }
                for s in self.sections
            ],
            "generated_at": self.generated_at,
            "file_path": self.file_path,
        }


# ============================================================
#  报告生成引擎
# ============================================================

class ReportGenerator:
    """
    学情报告生成引擎
    
    支持生成:
    1. 学生周报/月报（个人学情概览+各科分析+书写能力+建议）
    2. 班级周报/月报（班级统计+分数分布+薄弱知识点）
    3. 考试分析报告（成绩分析+区分度+难度系数）
    4. 书写成长报告（书写质量趋势+笔顺进步+对比）
    5. 家长推送报告（简化版个人学情+学习建议）
    
    输出格式: JSON / PDF / HTML
    """

    def __init__(self, output_dir: str, template_dir: str):
        """初始化报告引擎"""
        self.output_dir = output_dir
        self.template_dir = template_dir
        logger.info("报告引擎初始化: output=%s", output_dir)

    async def generate_report(
        self, config: ReportConfig
    ) -> GeneratedReport:
        """
        根据配置生成报告
        
        流程:
        1. 从ClickHouse/MySQL查询原始数据
        2. 调用对应报告类型的分析逻辑
        3. 组装报告章节
        4. 输出为指定格式
        """
        logger.info(
            "开始生成报告: type=%s, target=%s, period=%s~%s",
            config.report_type.value,
            config.target_id,
            config.start_date,
            config.end_date,
        )

        # 根据报告类型分发
        generator_map = {
            ReportType.STUDENT_WEEKLY: self._gen_student_report,
            ReportType.STUDENT_MONTHLY: self._gen_student_report,
            ReportType.CLASS_WEEKLY: self._gen_class_report,
            ReportType.CLASS_MONTHLY: self._gen_class_report,
            ReportType.EXAM_ANALYSIS: self._gen_exam_report,
            ReportType.WRITING_GROWTH: self._gen_writing_report,
            ReportType.PARENT_PUSH: self._gen_parent_report,
        }

        gen_func = generator_map.get(config.report_type)
        if not gen_func:
            raise ValueError(f"不支持的报告类型: {config.report_type}")

        report = await gen_func(config)

        # 输出为指定格式
        if config.output_format == ReportFormat.PDF:
            await self._export_pdf(report)
        elif config.output_format == ReportFormat.HTML:
            await self._export_html(report)

        logger.info(
            "报告生成完成: id=%s, title=%s",
            report.report_id, report.title,
        )

        return report

    async def _gen_student_report(
        self, config: ReportConfig
    ) -> GeneratedReport:
        """
        生成学生个人学情报告（周报/月报）
        
        章节结构:
        1. 总体概览（综合评分、排名、趋势）
        2. 各科目分析（分数、掌握知识点、薄弱点）
        3. 作业完成情况
        4. 书写能力评估
        5. 学习习惯分析
        6. 个性化建议
        """
        report_id = self._gen_report_id(config)
        period_label = f"{config.start_date} ~ {config.end_date}"
        is_weekly = config.report_type == ReportType.STUDENT_WEEKLY

        sections: List[ReportSection] = []

        # 第1节: 总体概览
        # overview_data = await self._query_student_overview(
        #     config.target_id, config.start_date, config.end_date
        # )
        sections.append(ReportSection(
            title="总体学情概览",
            section_type="summary",
            content={
                "overall_score": 0,
                "rank_in_class": 0,
                "rank_change": 0,  # 与上期对比排名变化
                "trend": "stable",
                "highlight": "",  # 亮点描述
            },
            order=1,
        ))

        # 第2节: 各科目分析
        sections.append(ReportSection(
            title="各科目学情分析",
            section_type="chart",
            content={
                "chart_type": "radar",  # 雷达图
                "subjects": [],  # [{name, score, class_avg, grade_avg}]
                "detail": [],    # 各科详细分析
            },
            order=2,
        ))

        # 第3节: 作业完成情况
        sections.append(ReportSection(
            title="作业完成统计",
            section_type="table",
            content={
                "total_homework": 0,
                "completed": 0,
                "on_time": 0,
                "avg_score": 0,
                "completion_rate": 0,
                "detail_list": [],  # 各科作业明细
            },
            order=3,
        ))

        # 第4节: 书写能力评估
        sections.append(ReportSection(
            title="书写能力评估",
            section_type="chart",
            content={
                "chart_type": "line",  # 折线图展示趋势
                "stroke_order_accuracy": 0,
                "writing_quality": 0,
                "writing_speed": 0,
                "trend_data": [],  # 时序数据点
                "improvement": "",
            },
            order=4,
        ))

        # 第5节: 学习习惯
        sections.append(ReportSection(
            title="学习习惯分析",
            section_type="chart",
            content={
                "chart_type": "bar",  # 柱状图展示每日时长
                "avg_daily_minutes": 0,
                "peak_hour": 0,
                "weekly_pattern": [],  # 周一~日时长
                "consistency": 0,
            },
            order=5,
        ))

        # 第6节: 个性化建议
        if config.include_recommendations:
            recommendations = self._generate_recommendations(
                student_id=config.target_id,
                sections=sections,
            )
            sections.append(ReportSection(
                title="个性化学习建议",
                section_type="recommendation",
                content={
                    "recommendations": recommendations,
                },
                order=6,
            ))

        # 生成摘要
        summary = self._generate_summary(sections, "student")

        return GeneratedReport(
            report_id=report_id,
            report_type=config.report_type,
            target_id=config.target_id,
            title=f"学生{'周' if is_weekly else '月'}学情报告",
            period=period_label,
            sections=sections,
            summary=summary,
            generated_at=datetime.now().isoformat(),
        )

    async def _gen_class_report(
        self, config: ReportConfig
    ) -> GeneratedReport:
        """
        生成班级学情报告
        
        章节: 班级概览、成绩分布、薄弱知识点、优秀/进步学生、教学建议
        """
        report_id = self._gen_report_id(config)
        sections: List[ReportSection] = []

        # 班级概览
        sections.append(ReportSection(
            title="班级学情概览",
            section_type="summary",
            content={
                "student_count": 0,
                "avg_score": 0,
                "median_score": 0,
                "pass_rate": 0,
                "excellent_rate": 0,
            },
            order=1,
        ))

        # 成绩分布
        sections.append(ReportSection(
            title="成绩分布分析",
            section_type="chart",
            content={
                "chart_type": "histogram",
                "distribution": {},  # 分数段人数分布
                "comparison": {},    # 与上期对比
            },
            order=2,
        ))

        # 薄弱知识点
        sections.append(ReportSection(
            title="班级薄弱知识点",
            section_type="table",
            content={
                "weak_points": [],  # [{知识点, 正确率, 涉及人数}]
            },
            order=3,
        ))

        # 优秀/进步学生
        sections.append(ReportSection(
            title="优秀与进步学生",
            section_type="table",
            content={
                "top_students": [],       # 前10名
                "most_improved": [],      # 进步最大的学生
                "need_attention": [],     # 需关注的学生
            },
            order=4,
        ))

        # 教学建议
        sections.append(ReportSection(
            title="教学改进建议",
            section_type="recommendation",
            content={
                "recommendations": [
                    "针对薄弱知识点加强集中讲解和专项练习",
                    "关注成绩下滑学生，及时进行个别辅导",
                    "利用分层作业满足不同水平学生需求",
                ],
            },
            order=5,
        ))

        return GeneratedReport(
            report_id=report_id,
            report_type=config.report_type,
            target_id=config.target_id,
            title="班级学情分析报告",
            period=f"{config.start_date} ~ {config.end_date}",
            sections=sections,
            generated_at=datetime.now().isoformat(),
        )

    async def _gen_exam_report(
        self, config: ReportConfig
    ) -> GeneratedReport:
        """生成考试分析报告（成绩分布+题目区分度+难度系数）"""
        report_id = self._gen_report_id(config)

        sections = [
            ReportSection(
                title="考试基本信息",
                section_type="summary",
                content={"exam_name": "", "subject": "", "total_score": 100},
                order=1,
            ),
            ReportSection(
                title="成绩统计",
                section_type="chart",
                content={
                    "avg": 0, "median": 0, "max": 0, "min": 0,
                    "std_dev": 0, "pass_rate": 0,
                    "distribution": {},
                },
                order=2,
            ),
            ReportSection(
                title="题目分析",
                section_type="table",
                content={
                    "questions": [],  # 每题的得分率、区分度、难度系数
                },
                order=3,
            ),
        ]

        return GeneratedReport(
            report_id=report_id,
            report_type=config.report_type,
            target_id=config.target_id,
            title="考试分析报告",
            period=config.start_date,
            sections=sections,
            generated_at=datetime.now().isoformat(),
        )

    async def _gen_writing_report(
        self, config: ReportConfig
    ) -> GeneratedReport:
        """生成书写成长报告"""
        report_id = self._gen_report_id(config)

        sections = [
            ReportSection(
                title="书写能力总评",
                section_type="summary",
                content={
                    "overall_level": "",
                    "stroke_accuracy": 0,
                    "quality_score": 0,
                    "speed": 0,
                },
                order=1,
            ),
            ReportSection(
                title="成长趋势",
                section_type="chart",
                content={
                    "chart_type": "line",
                    "data_points": [],  # 按周/月的评分趋势
                },
                order=2,
            ),
            ReportSection(
                title="常见书写问题",
                section_type="table",
                content={
                    "issues": [],  # 笔顺错误、结构问题等
                },
                order=3,
            ),
        ]

        return GeneratedReport(
            report_id=report_id,
            report_type=config.report_type,
            target_id=config.target_id,
            title="书写成长报告",
            period=f"{config.start_date} ~ {config.end_date}",
            sections=sections,
            generated_at=datetime.now().isoformat(),
        )

    async def _gen_parent_report(
        self, config: ReportConfig
    ) -> GeneratedReport:
        """
        生成家长推送报告（简化版）
        
        家长端报告简洁明了：
        - 本周学习概况（评分、排名变化）
        - 学习时长统计
        - 需要关注的科目
        - 家长配合建议
        """
        report_id = self._gen_report_id(config)

        sections = [
            ReportSection(
                title="本周学习概况",
                section_type="summary",
                content={
                    "overall_score": 0,
                    "rank_change": 0,
                    "homework_completed": 0,
                    "total_homework": 0,
                    "study_minutes": 0,
                },
                order=1,
            ),
            ReportSection(
                title="需要关注",
                section_type="text",
                content={
                    "attention_subjects": [],
                    "weak_points": [],
                },
                order=2,
            ),
            ReportSection(
                title="家长建议",
                section_type="recommendation",
                content={
                    "recommendations": [
                        "建议督促孩子按时完成作业",
                        "建议每天安排15-20分钟练字时间",
                        "多鼓励孩子在薄弱科目上的进步",
                    ],
                },
                order=3,
            ),
        ]

        return GeneratedReport(
            report_id=report_id,
            report_type=config.report_type,
            target_id=config.target_id,
            title="孩子本周学情报告",
            period=f"{config.start_date} ~ {config.end_date}",
            sections=sections,
            generated_at=datetime.now().isoformat(),
        )

    def _generate_recommendations(
        self,
        student_id: str,
        sections: List[ReportSection],
    ) -> List[str]:
        """基于各章节数据生成个性化学习建议"""
        recommendations: List[str] = []

        # 根据作业完成情况生成建议
        for section in sections:
            if section.title == "作业完成统计":
                rate = section.content.get("completion_rate", 0)
                if rate < 80:
                    recommendations.append(
                        "作业完成率偏低，建议养成当天作业当天完成的习惯"
                    )

            if section.title == "书写能力评估":
                quality = section.content.get("writing_quality", 0)
                if quality < 60:
                    recommendations.append(
                        "书写规范性有待提高，建议每天坚持15分钟字帖练习"
                    )

            if section.title == "学习习惯分析":
                consistency = section.content.get("consistency", 0)
                if consistency < 0.5:
                    recommendations.append(
                        "学习时间不够规律，建议制定固定的学习作息计划"
                    )

        if not recommendations:
            recommendations.append("继续保持良好的学习习惯，争取更大进步！")

        return recommendations

    def _generate_summary(
        self,
        sections: List[ReportSection],
        report_target: str,
    ) -> str:
        """根据报告章节自动生成文字摘要"""
        if report_target == "student":
            return "本报告汇总了该学生在报告周期内的学业表现、书写能力和学习习惯分析。"
        elif report_target == "class":
            return "本报告汇总了班级在报告周期内的整体学情、成绩分布和教学建议。"
        return ""

    def _gen_report_id(self, config: ReportConfig) -> str:
        """生成唯一报告ID"""
        raw = (
            f"{config.report_type.value}_{config.target_id}_"
            f"{config.start_date}_{config.end_date}"
        )
        return hashlib.md5(raw.encode()).hexdigest()[:16]

    async def _export_pdf(self, report: GeneratedReport) -> None:
        """
        将报告导出为PDF文件
        
        使用ReportLab/WeasyPrint渲染PDF:
        - 页眉: 自然写logo + 报告标题
        - 正文: 各章节内容（图表使用ECharts渲染为图片）
        - 页脚: 页码 + 生成时间
        """
        # from weasyprint import HTML
        # html_content = self._render_html_template(report)
        # pdf_path = f"{self.output_dir}/{report.report_id}.pdf"
        # HTML(string=html_content).write_pdf(pdf_path)
        # report.file_path = pdf_path
        logger.info("PDF导出: %s", report.report_id)

    async def _export_html(self, report: GeneratedReport) -> None:
        """将报告导出为HTML文件"""
        # html_path = f"{self.output_dir}/{report.report_id}.html"
        # with open(html_path, "w", encoding="utf-8") as f:
        #     f.write(self._render_html_template(report))
        # report.file_path = html_path
        logger.info("HTML导出: %s", report.report_id)


# ============================================================
#  定时报告生成调度
# ============================================================

class ReportScheduler:
    """
    报告定时生成调度器
    
    支持:
    - 每日凌晨生成前一天的学生日报
    - 每周一生成上周的学生周报和班级周报
    - 每月1日生成上月的月报
    """

    def __init__(self, generator: ReportGenerator):
        self.generator = generator
        logger.info("报告调度器初始化")

    async def run_daily_reports(self) -> int:
        """执行每日报告生成任务"""
        yesterday = (date.today() - timedelta(days=1)).isoformat()
        logger.info("执行每日报告生成: date=%s", yesterday)

        generated_count = 0
        # 查询所有活跃学生ID
        # student_ids = await get_active_student_ids()
        # for sid in student_ids:
        #     config = ReportConfig(
        #         report_type=ReportType.PARENT_PUSH,
        #         target_id=sid,
        #         start_date=yesterday,
        #         end_date=yesterday,
        #     )
        #     await self.generator.generate_report(config)
        #     generated_count += 1

        logger.info("每日报告生成完成: 共%d份", generated_count)
        return generated_count

    async def run_weekly_reports(self) -> int:
        """执行每周报告生成任务"""
        end_date = date.today() - timedelta(days=1)
        start_date = end_date - timedelta(days=6)
        logger.info(
            "执行每周报告: %s ~ %s",
            start_date.isoformat(),
            end_date.isoformat(),
        )

        generated_count = 0
        # 生成学生周报和班级周报
        # ...

        logger.info("每周报告生成完成: 共%d份", generated_count)
        return generated_count

    async def run_monthly_reports(self) -> int:
        """执行月度报告生成任务"""
        today = date.today()
        end_date = today.replace(day=1) - timedelta(days=1)
        start_date = end_date.replace(day=1)
        logger.info(
            "执行月度报告: %s ~ %s",
            start_date.isoformat(),
            end_date.isoformat(),
        )

        generated_count = 0
        # 生成学生月报、班级月报、书写成长报告
        # ...

        logger.info("月度报告生成完成: 共%d份", generated_count)
        return generated_count
