from __future__ import annotations

from typing import TYPE_CHECKING, Literal, Optional

from pydantic import BaseModel, Field

if TYPE_CHECKING:
    from app.models.export_record import ExportRecord


# ------------------------------------------------------------------ #
# 导出请求 / 响应
# ------------------------------------------------------------------ #

class ExportDocRequest(BaseModel):
    user_id: str = Field(..., alias="userId", description="当前用户 ID")
    file_name: str = Field(..., alias="fileName", max_length=255, description="文件名（不含扩展名）")
    format: Literal["doc"] = Field(..., description="阶段 0 固定为 doc")
    content: str = Field(..., description="文档当前内容（Markdown）")
    document_id: Optional[str] = Field(None, alias="documentId", description="关联文档 ID，传入时同步更新草稿")
    style_id: Optional[str] = Field(None, alias="styleId", description="样式 ID；不传时使用默认样式")

    model_config = {"populate_by_name": True}


class ExportDocResponse(BaseModel):
    record_id: str = Field(..., serialization_alias="recordId")
    download_url: str = Field(..., serialization_alias="downloadUrl")
    file_name: str = Field(..., serialization_alias="fileName")
    style_id: str = Field(..., serialization_alias="styleId", description="实际使用的样式 ID")
    warning: Optional[str] = Field(None, serialization_alias="warning", description="存储超限时的警告信息")

    model_config = {"populate_by_name": True}


# ------------------------------------------------------------------ #
# 导出记录
# ------------------------------------------------------------------ #

class ExportRecordSchema(BaseModel):
    record_id: str = Field(..., serialization_alias="recordId")
    user_id: str = Field(..., serialization_alias="userId")
    file_name: str = Field(..., serialization_alias="fileName")
    file_size: int = Field(..., serialization_alias="fileSize")
    download_url: str = Field(..., serialization_alias="downloadUrl")
    document_id: Optional[str] = Field(None, serialization_alias="documentId")
    style_id: str = Field(..., serialization_alias="styleId")
    created_at: int = Field(..., serialization_alias="createdAt", description="Unix 毫秒时间戳")

    model_config = {"populate_by_name": True}

    @classmethod
    def from_record(cls, r: "ExportRecord") -> "ExportRecordSchema":
        return cls(
            record_id=r.id,
            user_id=r.user_id,
            file_name=r.file_name,
            file_size=r.file_size,
            download_url=r.download_url,
            document_id=r.document_id,
            style_id=r.style_id,
            created_at=int(r.created_at.timestamp() * 1000),
        )


class PaginationSchema(BaseModel):
    page: int
    page_size: int = Field(..., serialization_alias="pageSize")
    total: int
    total_pages: int = Field(..., serialization_alias="totalPages")

    model_config = {"populate_by_name": True}


class ExportRecordListResponse(BaseModel):
    records: list[ExportRecordSchema]
    pagination: PaginationSchema