"""
Layer 4: 上下文管理器
"""
import time
from dataclasses import dataclass, field
from typing import Optional

from layers.explorer import ExplorationStep
from layers.insights import Insight


@dataclass
class AnalysisSession:
    """一次分析的完整记录"""
    question: str
    plan: dict
    steps: list[ExplorationStep]
    insights: list[Insight]
    report: str
    timestamp: float = field(default_factory=time.time)

    def summary(self) -> str:
        parts = [f"**问题**: {self.question}"]
        if self.plan:
            parts.append(f"**分析类型**: {self.plan.get('analysis_type', 'unknown')}")
            parts.append(f"**维度**: {', '.join(self.plan.get('dimensions', []))}")
        key_findings = []
        for step in self.steps:
            if step.success and step.rows:
                top_row = step.rows[0] if step.rows else {}
                finding = f"{step.purpose}: " + ", ".join(f"{k}={v}" for k, v in top_row.items() if k.lower() != "id")
                key_findings.append(finding)
        if key_findings:
            parts.append("**核心发现**:")
            for f in key_findings[:5]:
                parts.append(f"  - {f}")
        if self.insights:
            parts.append("**洞察**:")
            for i in self.insights[:3]:
                parts.append(f"  - {i}")
        return "\n".join(parts)

    def to_reference_text(self) -> str:
        return (
            f"## 之前的分析\n### 问题\n{self.question}\n### 摘要\n{self.summary()}\n### 发现\n"
            + "\n".join(f"- {s.purpose}: {s.row_count} 行" for s in self.steps if s.success)
        )


class ContextManager:
    """上下文管理器"""

    def __init__(self, max_history: int = 10):
        self.sessions: list[AnalysisSession] = []
        self.max_history = max_history

    def add_session(self, question: str, plan: dict, steps: list[ExplorationStep],
                    insights: list[Insight], report: str) -> AnalysisSession:
        session = AnalysisSession(question=question, plan=plan, steps=steps, insights=insights, report=report)
        self.sessions.append(session)
        if len(self.sessions) > self.max_history:
            self.sessions = self.sessions[-self.max_history:]
        return session

    def get_context_for(self, new_question: str) -> Optional[str]:
        if not self.sessions:
            return None
        return "\n\n---\n\n".join(s.to_reference_text() for s in self.sessions[-2:])

    def get_history_summary(self) -> str:
        if not self.sessions:
            return "（无历史分析）"
        lines = [f"共 {len(self.sessions)} 次分析："]
        for i, s in enumerate(self.sessions, 1):
            ts = time.strftime("%H:%M", time.localtime(s.timestamp))
            lines.append(f"  {i}. [{ts}] {s.question}")
        return "\n".join(lines)

    def clear(self):
        self.sessions.clear()