#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""报表版本管理服务"""
import copy
import json
import logging
from typing import Any, Dict, List, Optional

from sqlalchemy import select, update, func, and_
from sqlalchemy.ext.asyncio import AsyncSession

from online_dev.report_manager.model import ReportTemplate, ReportVersion, ReportDataset
from online_dev.report_manager.enums import ReportVersionState
from online_dev.report_manager.exceptions import ReportServiceException
from online_dev.report_manager.constants import default_snapshot, default_cells
from online_dev.report_manager.dataset_bridge import ReportDatasetBridge

logger = logging.getLogger(__name__)


class ReportVersionService:
    @staticmethod
    async def get(db: AsyncSession, version_id: str) -> ReportVersion:
        stmt = select(ReportVersion).where(
            ReportVersion.id == version_id,
            ReportVersion.is_deleted == False,
        )
        ver = (await db.execute(stmt)).scalar_one_or_none()
        if not ver:
            raise ReportServiceException(f"版本不存在: {version_id}")
        return ver

    @staticmethod
    async def list_by_template(db: AsyncSession, template_id: str) -> List[ReportVersion]:
        stmt = (
            select(ReportVersion)
            .where(
                ReportVersion.template_id == template_id,
                ReportVersion.is_deleted == False,
            )
            .order_by(ReportVersion.version.desc())
        )
        return list((await db.execute(stmt)).scalars().all())

    @staticmethod
    async def get_active(db: AsyncSession, template_id: str) -> Optional[ReportVersion]:
        stmt = select(ReportVersion).where(
            ReportVersion.template_id == template_id,
            ReportVersion.state == ReportVersionState.ACTIVE,
            ReportVersion.is_deleted == False,
        )
        return (await db.execute(stmt)).scalar_one_or_none()

    @staticmethod
    async def get_designing_or_latest(db: AsyncSession, template_id: str) -> Optional[ReportVersion]:
        stmt = select(ReportVersion).where(
            ReportVersion.template_id == template_id,
            ReportVersion.is_deleted == False,
        ).order_by(
            ReportVersion.state.asc(),
            ReportVersion.version.desc(),
        )
        versions = list((await db.execute(stmt)).scalars().all())
        for v in versions:
            if v.state == ReportVersionState.DESIGNING:
                return v
        return versions[0] if versions else None

    @staticmethod
    def _parse_json_field(value: Any, default: Any) -> Any:
        if value is None:
            return default
        if isinstance(value, str):
            try:
                return json.loads(value)
            except json.JSONDecodeError:
                return default
        return value

    @staticmethod
    async def save(db: AsyncSession, data: Dict[str, Any], user_id: str = None) -> Dict[str, Any]:
        from online_dev.report_manager.service import ReportService

        template_id = data.get("id")
        tpl = await ReportService.get(db, template_id)

        version_id = data.get("version_id")
        save_type = data.get("type", 0)

        snapshot = ReportVersionService._parse_json_field(data.get("snapshot"), default_snapshot())
        cells = ReportVersionService._parse_json_field(data.get("cells"), default_cells())
        query_list = ReportVersionService._parse_json_field(data.get("query_list"), [])
        sort_list = ReportVersionService._parse_json_field(data.get("sort_list"), [])
        column_list = ReportVersionService._parse_json_field(data.get("column_list"), [])
        fence_list = ReportVersionService._parse_json_field(data.get("fence_list"), [])
        convert_config = ReportVersionService._parse_json_field(data.get("convert_config"), {})
        data_set_list = data.get("data_set_list") or []

        if version_id:
            version = await ReportVersionService.get(db, version_id)
            if version.template_id != template_id:
                raise ReportServiceException("版本与模板不匹配")
            if version.state != ReportVersionState.DESIGNING:
                raise ReportServiceException("只能编辑设计中版本")
        else:
            designing = await ReportVersionService.get_designing_or_latest(db, template_id)
            if designing and designing.state == ReportVersionState.DESIGNING:
                version = designing
            else:
                max_ver = (
                    await db.execute(
                        select(func.max(ReportVersion.version)).where(
                            ReportVersion.template_id == template_id,
                            ReportVersion.is_deleted == False,
                        )
                    )
                ).scalar() or 0
                version = ReportVersion(
                    template_id=template_id,
                    version=max_ver + 1,
                    state=ReportVersionState.DESIGNING,
                    snapshot=default_snapshot(),
                    cells=default_cells(),
                    sys_creator_id=user_id,
                    sys_modifier_id=user_id,
                )
                db.add(version)
                await db.flush()

        version.snapshot = snapshot
        version.cells = cells
        version.query_list = query_list
        version.sort_list = sort_list
        version.column_list = column_list
        version.fence_list = fence_list
        version.convert_config = convert_config
        version.sys_modifier_id = user_id

        await ReportDatasetBridge.sync_datasets(db, version.id, data_set_list)

        if save_type == 1:
            stmt = update(ReportVersion).where(
                ReportVersion.template_id == template_id,
                ReportVersion.state == ReportVersionState.ACTIVE,
                ReportVersion.is_deleted == False,
            ).values(state=ReportVersionState.ARCHIVED)
            await db.execute(stmt)
            version.state = ReportVersionState.ACTIVE
            await db.flush()

            max_ver = (
                await db.execute(
                    select(func.max(ReportVersion.version)).where(
                        ReportVersion.template_id == template_id,
                        ReportVersion.is_deleted == False,
                    )
                )
            ).scalar() or version.version
            new_designing = ReportVersion(
                template_id=template_id,
                version=max_ver + 1,
                state=ReportVersionState.DESIGNING,
                snapshot=copy.deepcopy(version.snapshot),
                cells=copy.deepcopy(version.cells),
                query_list=copy.deepcopy(version.query_list),
                sort_list=copy.deepcopy(version.sort_list),
                column_list=copy.deepcopy(version.column_list),
                fence_list=copy.deepcopy(version.fence_list),
                convert_config=copy.deepcopy(version.convert_config),
                sys_creator_id=user_id,
                sys_modifier_id=user_id,
            )
            db.add(new_designing)
            await db.flush()
            await ReportDatasetBridge.copy_datasets(db, version.id, new_designing.id)
            version = new_designing
        else:
            version.state = ReportVersionState.DESIGNING

        await db.commit()
        await db.refresh(version)
        return {
            "template_id": template_id,
            "version_id": version.id,
            "state": int(version.state),
        }

    @staticmethod
    async def get_version_detail(db: AsyncSession, version_id: str) -> Dict[str, Any]:
        version = await ReportVersionService.get(db, version_id)
        datasets = await ReportDatasetBridge.list_by_version(db, version_id)
        return {
            "version": version,
            "datasets": datasets,
        }

    @staticmethod
    async def delete_version(db: AsyncSession, version_id: str) -> bool:
        version = await ReportVersionService.get(db, version_id)
        if version.state in (ReportVersionState.ACTIVE, ReportVersionState.ARCHIVED):
            raise ReportServiceException("不能删除启用中或已归档版本")

        count_stmt = select(func.count(ReportVersion.id)).where(
            ReportVersion.template_id == version.template_id,
            ReportVersion.is_deleted == False,
        )
        if (await db.execute(count_stmt)).scalar() <= 1:
            raise ReportServiceException("不能删除最后一个版本")

        version.is_deleted = True
        await ReportDatasetBridge.delete_by_version(db, version_id)
        await db.commit()
        return True

    @staticmethod
    async def copy_version_content(
        db: AsyncSession,
        src_version_id: str,
        new_template_id: str,
        user_id: str = None,
    ) -> None:
        src = await ReportVersionService.get(db, src_version_id)
        new_ver = (
            await db.execute(
                select(ReportVersion).where(
                    ReportVersion.template_id == new_template_id,
                    ReportVersion.is_deleted == False,
                )
            )
        ).scalar_one_or_none()
        if not new_ver:
            return
        new_ver.snapshot = src.snapshot
        new_ver.cells = src.cells
        new_ver.query_list = src.query_list
        new_ver.sort_list = src.sort_list
        new_ver.column_list = src.column_list
        new_ver.fence_list = src.fence_list
        new_ver.convert_config = src.convert_config
        await ReportDatasetBridge.copy_datasets(db, src_version_id, new_ver.id)
        await db.commit()

    @staticmethod
    async def duplicate_version(
        db: AsyncSession,
        src_version_id: str,
        user_id: str = None,
    ) -> ReportVersion:
        """复制版本为新的「设计中」版本（同模板）。"""
        src = await ReportVersionService.get(db, src_version_id)
        template_id = src.template_id

        await db.execute(
            update(ReportVersion).where(
                ReportVersion.template_id == template_id,
                ReportVersion.state == ReportVersionState.DESIGNING,
                ReportVersion.is_deleted == False,
            ).values(state=ReportVersionState.ARCHIVED)
        )

        max_ver = (
            await db.execute(
                select(func.max(ReportVersion.version)).where(
                    ReportVersion.template_id == template_id,
                    ReportVersion.is_deleted == False,
                )
            )
        ).scalar() or 0

        new_ver = ReportVersion(
            template_id=template_id,
            version=max_ver + 1,
            state=ReportVersionState.DESIGNING,
            snapshot=copy.deepcopy(src.snapshot),
            cells=copy.deepcopy(src.cells),
            query_list=copy.deepcopy(src.query_list),
            sort_list=copy.deepcopy(src.sort_list),
            column_list=copy.deepcopy(src.column_list),
            fence_list=copy.deepcopy(src.fence_list),
            convert_config=copy.deepcopy(src.convert_config),
            sys_creator_id=user_id,
            sys_modifier_id=user_id,
        )
        db.add(new_ver)
        await db.flush()
        await ReportDatasetBridge.copy_datasets(db, src.id, new_ver.id)
        await db.commit()
        await db.refresh(new_ver)
        return new_ver