"""
Memory Implementation - 内存存储实现

用于测试和简单场景，数据不持久化
"""

from typing import Dict, List, Optional, Any
from datetime import datetime

from agent.models.trace import Trace, Step
from agent.models.memory import Experience, Skill


class MemoryTraceStore:
    """内存 Trace 存储"""

    def __init__(self):
        self._traces: Dict[str, Trace] = {}
        self._steps: Dict[str, Step] = {}
        self._trace_steps: Dict[str, List[str]] = {}  # trace_id -> [step_ids]

    async def create_trace(self, trace: Trace) -> str:
        self._traces[trace.trace_id] = trace
        self._trace_steps[trace.trace_id] = []
        return trace.trace_id

    async def get_trace(self, trace_id: str) -> Optional[Trace]:
        return self._traces.get(trace_id)

    async def update_trace(self, trace_id: str, **updates) -> None:
        trace = self._traces.get(trace_id)
        if trace:
            for key, value in updates.items():
                if hasattr(trace, key):
                    setattr(trace, key, value)

    async def list_traces(
        self,
        mode: Optional[str] = None,
        agent_type: Optional[str] = None,
        uid: Optional[str] = None,
        status: Optional[str] = None,
        limit: int = 50
    ) -> List[Trace]:
        traces = list(self._traces.values())

        # 过滤
        if mode:
            traces = [t for t in traces if t.mode == mode]
        if agent_type:
            traces = [t for t in traces if t.agent_type == agent_type]
        if uid:
            traces = [t for t in traces if t.uid == uid]
        if status:
            traces = [t for t in traces if t.status == status]

        # 排序（最新的在前）
        traces.sort(key=lambda t: t.created_at, reverse=True)

        return traces[:limit]

    async def add_step(self, step: Step) -> str:
        self._steps[step.step_id] = step

        # 添加到 trace 的 steps 列表
        if step.trace_id in self._trace_steps:
            self._trace_steps[step.trace_id].append(step.step_id)

        # 更新 trace 的 total_steps
        trace = self._traces.get(step.trace_id)
        if trace:
            trace.total_steps += 1

        return step.step_id

    async def get_step(self, step_id: str) -> Optional[Step]:
        return self._steps.get(step_id)

    async def get_trace_steps(self, trace_id: str) -> List[Step]:
        step_ids = self._trace_steps.get(trace_id, [])
        steps = [self._steps[sid] for sid in step_ids if sid in self._steps]
        steps.sort(key=lambda s: s.sequence)
        return steps

    async def get_step_children(self, step_id: str) -> List[Step]:
        children = []
        for step in self._steps.values():
            if step_id in step.parent_ids:
                children.append(step)
        children.sort(key=lambda s: s.sequence)
        return children


class MemoryMemoryStore:
    """内存 Memory 存储（Experience + Skill）"""

    def __init__(self):
        self._experiences: Dict[str, Experience] = {}
        self._skills: Dict[str, Skill] = {}

    # ===== Experience =====

    async def add_experience(self, exp: Experience) -> str:
        self._experiences[exp.exp_id] = exp
        return exp.exp_id

    async def get_experience(self, exp_id: str) -> Optional[Experience]:
        return self._experiences.get(exp_id)

    async def search_experiences(
        self,
        scope: str,
        context: str,
        limit: int = 10
    ) -> List[Experience]:
        # 简单实现：按 scope 过滤，按 confidence 排序
        experiences = [
            e for e in self._experiences.values()
            if e.scope == scope
        ]
        experiences.sort(key=lambda e: e.confidence, reverse=True)
        return experiences[:limit]

    async def update_experience_stats(
        self,
        exp_id: str,
        success: bool
    ) -> None:
        exp = self._experiences.get(exp_id)
        if exp:
            exp.usage_count += 1
            if success:
                # 更新成功率
                total_success = exp.success_rate * (exp.usage_count - 1) + (1 if success else 0)
                exp.success_rate = total_success / exp.usage_count
            exp.updated_at = datetime.now()

    # ===== Skill =====

    async def add_skill(self, skill: Skill) -> str:
        self._skills[skill.skill_id] = skill
        return skill.skill_id

    async def get_skill(self, skill_id: str) -> Optional[Skill]:
        return self._skills.get(skill_id)

    async def get_skill_tree(self, scope: str) -> List[Skill]:
        return [s for s in self._skills.values() if s.scope == scope]

    async def search_skills(
        self,
        scope: str,
        context: str,
        limit: int = 5
    ) -> List[Skill]:
        # 简单实现：按 scope 过滤
        skills = [s for s in self._skills.values() if s.scope == scope]
        return skills[:limit]


class MemoryStateStore:
    """内存状态存储"""

    def __init__(self):
        self._state: Dict[str, Dict[str, Any]] = {}

    async def get(self, key: str) -> Optional[Dict[str, Any]]:
        return self._state.get(key)

    async def set(
        self,
        key: str,
        value: Dict[str, Any],
        ttl: Optional[int] = None
    ) -> None:
        # 内存实现忽略 ttl
        self._state[key] = value

    async def update(self, key: str, **updates) -> None:
        if key in self._state:
            self._state[key].update(updates)

    async def delete(self, key: str) -> None:
        self._state.pop(key, None)