"""
记忆系统 API 路由

Memory System API - 提供记忆系统的管理接口
"""
from fastapi import APIRouter, Depends, HTTPException, status
from typing import List, Dict
from datetime import datetime
import uuid

from app.models.memory import (
    EnhancedMemory,
    TimelineEvent,
    PendingThread,
    ThreadCreateRequest,
    ThreadUpdateRequest,
    ThreadResolveRequest,
    MemoryUpdateRequest,
    MemoryExtractionResult,
    CharacterStateChange,
    ResolutionSuggestion,
    ThreadStatus,
    ImportanceLevel
)
from app.models.project import SeriesProject, Episode
from app.core.memory.memory_manager import get_memory_manager, MemoryManager
from app.db.repositories import project_repo, episode_repo
from app.utils.logger import get_logger

logger = get_logger(__name__)

router = APIRouter(prefix="/projects/{project_id}/memory", tags=["记忆系统"])


# ============================================
# 辅助函数
# ============================================

async def verify_project(project_id: str) -> SeriesProject:
    """验证项目存在性"""
    project = await project_repo.get(project_id)
    if not project:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"项目不存在: {project_id}"
        )
    return project


# ============================================
# 记忆系统主端点
# ============================================

@router.get("/", response_model=EnhancedMemory)
async def get_project_memory(project_id: str):
    """
    获取项目完整记忆系统

    返回项目的所有记忆数据，包括：
    - 事件时间线
    - 待收线问题
    - 角色状态历史
    - 伏笔追踪
    - 角色关系
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)
    return enhanced_memory


@router.post("/update", response_model=MemoryExtractionResult)
async def update_memory_from_episode(
    project_id: str,
    request: MemoryUpdateRequest
):
    """
    从剧集更新记忆系统

    自动执行以下操作：
    - 提取关键事件
    - 检测伏笔和待收线
    - 更新角色状态
    - 检查一致性

    Args:
        request: 记忆更新请求
    """
    project = await verify_project(project_id)

    # 获取剧集
    episodes = await episode_repo.list_by_project(project_id)
    episode = None
    for ep in episodes:
        if ep.number == request.episode_number:
            episode = ep
            break

    if not episode:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"剧集不存在: EP{request.episode_number}"
        )

    if not episode.content:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="剧集内容为空，无法更新记忆"
        )

    try:
        memory_manager = get_memory_manager()
        result = await memory_manager.update_memory_from_episode(project, episode)

        # 保存更新后的记忆
        await project_repo.update(project_id, {
            "memory": project.memory.dict()
        })

        return result

    except Exception as e:
        logger.error(f"更新记忆失败: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"更新记忆失败: {str(e)}"
        )


# ============================================
# 事件时间线
# ============================================

@router.get("/timeline", response_model=List[TimelineEvent])
async def get_event_timeline(
    project_id: str,
    skip: int = 0,
    limit: int = 100,
    episode: int = None,
    importance: ImportanceLevel = None,
    character: str = None
):
    """
    获取事件时间线

    支持过滤：
    - episode: 按集数过滤
    - importance: 按重要程度过滤
    - character: 按角色过滤
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    events = enhanced_memory.eventTimeline

    # 应用过滤
    if episode is not None:
        events = [e for e in events if e.episode == episode]

    if importance is not None:
        events = [e for e in events if e.importance == importance]

    if character:
        events = [e for e in events if character in e.characters_involved]

    # 按集数排序
    events = sorted(events, key=lambda x: x.episode)

    # 分页
    return events[skip:skip + limit]


@router.get("/timeline/episodes", response_model=List[dict])
async def get_timeline_by_episodes(project_id: str):
    """
    按集数分组获取时间线

    返回格式：[{episode: 1, events: [...]}, ...]
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    # 按集数分组
    episodes_dict = {}
    for event in enhanced_memory.eventTimeline:
        ep = event.episode
        if ep not in episodes_dict:
            episodes_dict[ep] = []
        episodes_dict[ep].append(event)

    # 转换为列表并排序
    result = [
        {"episode": ep, "events": events}
        for ep, events in sorted(episodes_dict.items())
    ]

    return result


# ============================================
# 待收线管理
# ============================================

@router.get("/threads", response_model=List[PendingThread])
async def get_pending_threads(
    project_id: str,
    status: ThreadStatus = None,
    importance: ImportanceLevel = None
):
    """
    获取待收线列表

    支持过滤：
    - status: 按状态过滤
    - importance: 按重要程度过滤
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    threads = enhanced_memory.pendingThreads

    # 应用过滤
    if status is not None:
        threads = [t for t in threads if t.status == status]

    if importance is not None:
        threads = [t for t in threads if t.importance == importance]

    # 按引入集数排序
    threads = sorted(threads, key=lambda x: x.introduced_at)

    return threads


@router.post("/threads", response_model=PendingThread, status_code=status.HTTP_201_CREATED)
async def create_thread(
    project_id: str,
    request: ThreadCreateRequest
):
    """
    手动添加待收线问题

    允许用户手动添加待收线，用于补充 LLM 未检测到的重要伏笔
    """
    project = await verify_project(project_id)

    # 获取当前最大集数
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)
    current_episode = enhanced_memory.last_episode_processed

    thread = PendingThread(
        id=str(uuid.uuid4()),
        description=request.description,
        introduced_at=current_episode,
        importance=request.importance,
        reminder_episode=request.reminder_episode,
        characters_involved=request.characters_involved,
        notes=request.notes,
        created_at=datetime.now(),
        updated_at=datetime.now()
    )

    # 添加到记忆
    enhanced_memory.pendingThreads.append(thread)
    project.memory = memory_manager._convert_to_memory(enhanced_memory)

    # 保存
    await project_repo.update(project_id, {
        "memory": project.memory.dict()
    })

    logger.info(f"创建待收线: {thread.id} - {thread.description}")
    return thread


@router.put("/threads/{thread_id}", response_model=PendingThread)
async def update_thread(
    project_id: str,
    thread_id: str,
    request: ThreadUpdateRequest
):
    """
    更新待收线信息

    允许修改待收线的描述、状态、重要程度等
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    # 查找待收线
    thread = None
    for t in enhanced_memory.pendingThreads:
        if t.id == thread_id:
            thread = t
            break

    if not thread:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"待收线不存在: {thread_id}"
        )

    # 更新字段
    if request.description is not None:
        thread.description = request.description

    if request.importance is not None:
        thread.importance = request.importance

    if request.status is not None:
        thread.status = request.status

    if request.reminder_episode is not None:
        thread.reminder_episode = request.reminder_episode

    if request.characters_involved is not None:
        thread.characters_involved = request.characters_involved

    if request.notes is not None:
        thread.notes = request.notes

    thread.updated_at = datetime.now()

    # 保存
    project.memory = memory_manager._convert_to_memory(enhanced_memory)
    await project_repo.update(project_id, {
        "memory": project.memory.dict()
    })

    logger.info(f"更新待收线: {thread_id}")
    return thread


@router.post("/resolve-thread", response_model=dict)
async def resolve_thread(
    project_id: str,
    request: ThreadResolveRequest
):
    """
    标记待收线为已解决

    记录待收线的收线信息
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    # 查找待收线
    thread = None
    for t in enhanced_memory.pendingThreads:
        if t.id == request.thread_id:
            thread = t
            break

    if not thread:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"待收线不存在: {request.thread_id}"
        )

    # 更新状态
    thread.resolved = True
    thread.resolved_at = request.resolved_at
    thread.status = ThreadStatus.RESOLVED
    thread.updated_at = datetime.now()

    # 添加收线摘要到 notes
    if request.resolution_summary:
        thread.notes += f"\n[收线摘要 EP{request.resolved_at}]: {request.resolution_summary}"

    # 保存
    project.memory = memory_manager._convert_to_memory(enhanced_memory)
    await project_repo.update(project_id, {
        "memory": project.memory.dict()
    })

    logger.info(f"收线完成: {request.thread_id} @ EP{request.resolved_at}")

    return {
        "success": True,
        "message": f"待收线已收线",
        "thread_id": request.thread_id,
        "resolved_at": request.resolved_at
    }


@router.delete("/threads/{thread_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_thread(
    project_id: str,
    thread_id: str
):
    """
    删除待收线

    移除不需要的待收线记录
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    # 查找并删除
    original_count = len(enhanced_memory.pendingThreads)
    enhanced_memory.pendingThreads = [
        t for t in enhanced_memory.pendingThreads
        if t.id != thread_id
    ]

    if len(enhanced_memory.pendingThreads) == original_count:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"待收线不存在: {thread_id}"
        )

    # 保存
    project.memory = memory_manager._convert_to_memory(enhanced_memory)
    await project_repo.update(project_id, {
        "memory": project.memory.dict()
    })

    logger.info(f"删除待收线: {thread_id}")
    return None


@router.get("/threads/{thread_id}/suggestion", response_model=ResolutionSuggestion)
async def get_thread_resolution_suggestion(
    project_id: str,
    thread_id: str
):
    """
    获取待收线的收线建议

    使用 LLM 生成如何收线的建议
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    # 查找待收线
    thread = None
    for t in enhanced_memory.pendingThreads:
        if t.id == thread_id:
            thread = t
            break

    if not thread:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"待收线不存在: {thread_id}"
        )

    try:
        suggestion = await memory_manager.suggest_thread_resolution(
            thread=thread,
            current_episode=enhanced_memory.last_episode_processed,
            memory=enhanced_memory
        )

        return suggestion

    except Exception as e:
        logger.error(f"生成收线建议失败: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"生成收线建议失败: {str(e)}"
        )


# ============================================
# 角色状态
# ============================================

@router.get("/characters", response_model=Dict[str, List[CharacterStateChange]])
async def get_character_states(
    project_id: str,
    character: str = None
):
    """
    获取角色状态历史

    Args:
        character: 可选，筛选特定角色
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    if character:
        if character not in enhanced_memory.characterStates:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail=f"角色不存在: {character}"
            )
        return {character: enhanced_memory.characterStates[character]}

    return enhanced_memory.characterStates


@router.get("/characters/{character_name}", response_model=List[CharacterStateChange])
async def get_character_state_history(
    project_id: str,
    character_name: str
):
    """
    获取特定角色的状态变化历史

    返回该角色在各集的状态变化记录
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    if character_name not in enhanced_memory.characterStates:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"角色不存在: {character_name}"
        )

    return enhanced_memory.characterStates[character_name]


# ============================================
# 伏笔追踪
# ============================================

@router.get("/foreshadowing")
async def get_foreshadowing(
    project_id: str,
    payoff_status: bool = None
):
    """
    获取伏笔列表

    Args:
        payoff_status: 可选，筛选是否已呼应
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    foreshadowing = enhanced_memory.foreshadowing

    if payoff_status is not None:
        foreshadowing = [f for f in foreshadowing if f.is_payed_off == payoff_status]

    return foreshadowing


# ============================================
# 一致性检查
# ============================================

@router.post("/check-consistency")
async def run_consistency_check(
    project_id: str,
    episode_number: int
):
    """
    对指定剧集进行一致性检查

    检查剧集与已有记忆的一致性
    """
    project = await verify_project(project_id)

    # 获取剧集
    episodes = await episode_repo.list_by_project(project_id)
    episode = None
    for ep in episodes:
        if ep.number == episode_number:
            episode = ep
            break

    if not episode:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"剧集不存在: EP{episode_number}"
        )

    if not episode.content:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="剧集内容为空"
        )

    try:
        memory_manager = get_memory_manager()
        enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

        issues = await memory_manager.check_consistency(
            episode.content,
            episode_number,
            enhanced_memory
        )

        # 添加到记忆
        enhanced_memory.consistencyIssues.extend(issues)
        project.memory = memory_manager._convert_to_memory(enhanced_memory)

        # 保存
        await project_repo.update(project_id, {
            "memory": project.memory.dict()
        })

        return {
            "episode_number": episode_number,
            "issues_found": len(issues),
            "issues": issues
        }

    except Exception as e:
        logger.error(f"一致性检查失败: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"一致性检查失败: {str(e)}"
        )


@router.get("/consistency-issues")
async def get_consistency_issues(
    project_id: str,
    severity: ImportanceLevel = None
):
    """
    获取一致性问题列表

    Args:
        severity: 可选，按严重程度筛选
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    issues = enhanced_memory.consistencyIssues

    if severity is not None:
        issues = [i for i in issues if i.severity == severity]

    return issues


# ============================================
# 角色关系
# ============================================

@router.get("/relationships")
async def get_relationships(project_id: str):
    """
    获取角色关系网络

    返回角色之间的关系映射
    """
    project = await verify_project(project_id)
    return project.memory.relationships


@router.put("/relationships")
async def update_relationships(
    project_id: str,
    relationships: Dict[str, Dict[str, str]]
):
    """
    更新角色关系网络

    允许手动更新角色之间的关系
    """
    project = await verify_project(project_id)

    project.memory.relationships = relationships

    await project_repo.update(project_id, {
        "memory": project.memory.dict()
    })

    logger.info(f"更新角色关系网络")
    return project.memory.relationships


# ============================================
# 统计信息
# ============================================

@router.get("/stats")
async def get_memory_stats(project_id: str):
    """
    获取记忆系统统计信息

    返回：
    - 总事件数
    - 待收线数量
    - 已收线数量
    - 角色数量
    - 伏笔数量
    - 一致性问题数量
    """
    project = await verify_project(project_id)
    memory_manager = get_memory_manager()
    enhanced_memory = memory_manager._convert_to_enhanced_memory(project.memory)

    pending_count = len([
        t for t in enhanced_memory.pendingThreads
        if not t.resolved
    ])

    resolved_count = len([
        t for t in enhanced_memory.pendingThreads
        if t.resolved
    ])

    foreshadowing_pending = len([
        f for f in enhanced_memory.foreshadowing
        if not f.is_payed_off
    ])

    return {
        "total_events": len(enhanced_memory.eventTimeline),
        "pending_threads": pending_count,
        "resolved_threads": resolved_count,
        "total_threads": len(enhanced_memory.pendingThreads),
        "characters_tracked": len(enhanced_memory.characterStates),
        "foreshadowing_total": len(enhanced_memory.foreshadowing),
        "foreshadowing_pending": foreshadowing_pending,
        "consistency_issues": len(enhanced_memory.consistencyIssues),
        "last_updated": enhanced_memory.last_updated,
        "last_episode_processed": enhanced_memory.last_episode_processed
    }