from fastapi import APIRouter, Depends
from pydantic import BaseModel
from typing import List, Optional

from app.core.auth import get_current_user
from app.core.database import get_db_connection
from app.core.response import create_api_response

router = APIRouter()

# Pydantic Models
class PromptIn(BaseModel):
    name: str
    task_type: str  # 'MEETING_TASK' 或 'KNOWLEDGE_TASK'
    content: str
    is_default: bool = False
    is_active: bool = True

class PromptOut(PromptIn):
    id: int
    creator_id: int
    created_at: str

class PromptListResponse(BaseModel):
    prompts: List[PromptOut]
    total: int

@router.post("/prompts")
def create_prompt(prompt: PromptIn, current_user: dict = Depends(get_current_user)):
    """Create a new prompt."""
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        try:
            # 如果设置为默认，需要先取消同类型其他提示词的默认状态
            if prompt.is_default:
                cursor.execute(
                    "UPDATE prompts SET is_default = FALSE WHERE task_type = %s",
                    (prompt.task_type,)
                )

            cursor.execute(
                """INSERT INTO prompts (name, task_type, content, is_default, is_active, creator_id)
                   VALUES (%s, %s, %s, %s, %s, %s)""",
                (prompt.name, prompt.task_type, prompt.content, prompt.is_default,
                 prompt.is_active, current_user["user_id"])
            )
            connection.commit()
            new_id = cursor.lastrowid
            return create_api_response(
                code="200",
                message="提示词创建成功",
                data={"id": new_id, **prompt.dict()}
            )
        except Exception as e:
            if "Duplicate entry" in str(e):
                return create_api_response(code="400", message="提示词名称已存在")
            return create_api_response(code="500", message=f"创建提示词失败: {e}")

@router.get("/prompts/active/{task_type}")
def get_active_prompts(task_type: str, current_user: dict = Depends(get_current_user)):
    """Get all active prompts for a specific task type."""
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        cursor.execute(
            """SELECT id, name, is_default
               FROM prompts
               WHERE task_type = %s AND is_active = TRUE
               ORDER BY is_default DESC, created_at DESC""",
            (task_type,)
        )
        prompts = cursor.fetchall()
        return create_api_response(
            code="200",
            message="获取启用模版列表成功",
            data={"prompts": prompts}
        )

@router.get("/prompts")
def get_prompts(
    task_type: Optional[str] = None,
    page: int = 1,
    size: int = 50,
    current_user: dict = Depends(get_current_user)
):
    """Get a paginated list of prompts filtered by current user and optionally by task_type."""
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)

        # 构建 WHERE 条件
        where_conditions = ["creator_id = %s"]
        params = [current_user["user_id"]]

        if task_type:
            where_conditions.append("task_type = %s")
            params.append(task_type)

        where_clause = " AND ".join(where_conditions)

        # 获取总数
        cursor.execute(
            f"SELECT COUNT(*) as total FROM prompts WHERE {where_clause}",
            tuple(params)
        )
        total = cursor.fetchone()['total']

        # 获取分页数据
        offset = (page - 1) * size
        cursor.execute(
            f"""SELECT id, name, task_type, content, is_default, is_active, creator_id, created_at
                FROM prompts
                WHERE {where_clause}
                ORDER BY created_at DESC
                LIMIT %s OFFSET %s""",
            tuple(params + [size, offset])
        )
        prompts = cursor.fetchall()
        return create_api_response(
            code="200",
            message="获取提示词列表成功",
            data={"prompts": prompts, "total": total}
        )

@router.get("/prompts/{prompt_id}")
def get_prompt(prompt_id: int, current_user: dict = Depends(get_current_user)):
    """Get a single prompt by its ID."""
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        cursor.execute(
            """SELECT id, name, task_type, content, is_default, is_active, creator_id, created_at
               FROM prompts WHERE id = %s""",
            (prompt_id,)
        )
        prompt = cursor.fetchone()
        if not prompt:
            return create_api_response(code="404", message="提示词不存在")
        return create_api_response(code="200", message="获取提示词成功", data=prompt)

@router.put("/prompts/{prompt_id}")
def update_prompt(prompt_id: int, prompt: PromptIn, current_user: dict = Depends(get_current_user)):
    """Update an existing prompt."""
    print(f"[UPDATE PROMPT] prompt_id={prompt_id}, type={type(prompt_id)}")
    print(f"[UPDATE PROMPT] user_id={current_user['user_id']}")
    print(f"[UPDATE PROMPT] data: name={prompt.name}, task_type={prompt.task_type}, content_len={len(prompt.content)}, is_default={prompt.is_default}, is_active={prompt.is_active}")

    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        try:
            # 先检查记录是否存在
            cursor.execute("SELECT id, creator_id FROM prompts WHERE id = %s", (prompt_id,))
            existing = cursor.fetchone()
            print(f"[UPDATE PROMPT] existing record: {existing}")

            if not existing:
                print(f"[UPDATE PROMPT] Prompt {prompt_id} not found in database")
                return create_api_response(code="404", message="提示词不存在")

            # 如果设置为默认，需要先取消同类型其他提示词的默认状态
            if prompt.is_default:
                print(f"[UPDATE PROMPT] Setting as default, clearing other defaults for task_type={prompt.task_type}")
                cursor.execute(
                    "UPDATE prompts SET is_default = FALSE WHERE task_type = %s AND id != %s",
                    (prompt.task_type, prompt_id)
                )
                print(f"[UPDATE PROMPT] Cleared {cursor.rowcount} other default prompts")

            print(f"[UPDATE PROMPT] Executing UPDATE query")
            cursor.execute(
                """UPDATE prompts
                   SET name = %s, task_type = %s, content = %s, is_default = %s, is_active = %s
                   WHERE id = %s""",
                (prompt.name, prompt.task_type, prompt.content, prompt.is_default,
                 prompt.is_active, prompt_id)
            )
            rows_affected = cursor.rowcount
            print(f"[UPDATE PROMPT] UPDATE affected {rows_affected} rows (0 means no changes needed)")

            # 注意：rowcount=0 不代表记录不存在，可能是所有字段值都相同
            # 我们已经在上面确认了记录存在，所以这里直接提交即可
            connection.commit()
            print(f"[UPDATE PROMPT] Success! Committed changes")
            return create_api_response(code="200", message="提示词更新成功")
        except Exception as e:
            print(f"[UPDATE PROMPT] Exception: {type(e).__name__}: {e}")
            if "Duplicate entry" in str(e):
                return create_api_response(code="400", message="提示词名称已存在")
            return create_api_response(code="500", message=f"更新提示词失败: {e}")

@router.delete("/prompts/{prompt_id}")
def delete_prompt(prompt_id: int, current_user: dict = Depends(get_current_user)):
    """Delete a prompt. Only the creator can delete their own prompts."""
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        # 首先检查提示词是否存在以及是否属于当前用户
        cursor.execute(
            "SELECT creator_id FROM prompts WHERE id = %s",
            (prompt_id,)
        )
        prompt = cursor.fetchone()

        if not prompt:
            return create_api_response(code="404", message="提示词不存在")

        if prompt['creator_id'] != current_user["user_id"]:
            return create_api_response(code="403", message="无权删除其他用户的提示词")

        # 删除提示词
        cursor.execute("DELETE FROM prompts WHERE id = %s", (prompt_id,))
        connection.commit()
        return create_api_response(code="200", message="提示词删除成功")