import logging
import time
import uuid
from typing import Optional
import re


from pydantic import BaseModel, ConfigDict
from sqlalchemy import BigInteger, Column, Text, JSON, Boolean, func
from sqlalchemy.orm import Session

from open_webui.internal.db import Base, JSONField, get_db, get_db_context


log = logging.getLogger(__name__)


####################
# Folder DB Schema
####################


class Folder(Base):
    __tablename__ = "folder"
    id = Column(Text, primary_key=True, unique=True)
    parent_id = Column(Text, nullable=True)
    user_id = Column(Text)
    name = Column(Text)
    items = Column(JSON, nullable=True)
    meta = Column(JSON, nullable=True)
    data = Column(JSON, nullable=True)
    is_expanded = Column(Boolean, default=False)
    created_at = Column(BigInteger)
    updated_at = Column(BigInteger)


class FolderModel(BaseModel):
    id: str
    parent_id: Optional[str] = None
    user_id: str
    name: str
    items: Optional[dict] = None
    meta: Optional[dict] = None
    data: Optional[dict] = None
    is_expanded: bool = False
    created_at: int
    updated_at: int

    model_config = ConfigDict(from_attributes=True)


class FolderMetadataResponse(BaseModel):
    icon: Optional[str] = None


class FolderNameIdResponse(BaseModel):
    id: str
    name: str
    meta: Optional[FolderMetadataResponse] = None
    parent_id: Optional[str] = None
    is_expanded: bool = False
    created_at: int
    updated_at: int


####################
# Forms
####################


class FolderForm(BaseModel):
    name: str
    data: Optional[dict] = None
    meta: Optional[dict] = None
    model_config = ConfigDict(extra="allow")


class FolderUpdateForm(BaseModel):
    name: Optional[str] = None
    data: Optional[dict] = None
    meta: Optional[dict] = None
    model_config = ConfigDict(extra="allow")


class FolderTable:
    def insert_new_folder(
        self, user_id: str, form_data: FolderForm, parent_id: Optional[str] = None, db: Optional[Session] = None
    ) -> Optional[FolderModel]:
        with get_db_context(db) as db:
            id = str(uuid.uuid4())
            folder = FolderModel(
                **{
                    "id": id,
                    "user_id": user_id,
                    **(form_data.model_dump(exclude_unset=True) or {}),
                    "parent_id": parent_id,
                    "created_at": int(time.time()),
                    "updated_at": int(time.time()),
                }
            )
            try:
                result = Folder(**folder.model_dump())
                db.add(result)
                db.commit()
                db.refresh(result)
                if result:
                    return FolderModel.model_validate(result)
                else:
                    return None
            except Exception as e:
                log.exception(f"Error inserting a new folder: {e}")
                return None

    def get_folder_by_id_and_user_id(
        self, id: str, user_id: str, db: Optional[Session] = None
    ) -> Optional[FolderModel]:
        try:
            with get_db_context(db) as db:
                folder = db.query(Folder).filter_by(id=id, user_id=user_id).first()

                if not folder:
                    return None

                return FolderModel.model_validate(folder)
        except Exception:
            return None

    def get_children_folders_by_id_and_user_id(
        self, id: str, user_id: str, db: Optional[Session] = None
    ) -> Optional[list[FolderModel]]:
        try:
            with get_db_context(db) as db:
                folders = []

                def get_children(folder):
                    children = self.get_folders_by_parent_id_and_user_id(
                        folder.id, user_id, db=db
                    )
                    for child in children:
                        get_children(child)
                        folders.append(child)

                folder = db.query(Folder).filter_by(id=id, user_id=user_id).first()
                if not folder:
                    return None

                get_children(folder)
                return folders
        except Exception:
            return None

    def get_folders_by_user_id(self, user_id: str, db: Optional[Session] = None) -> list[FolderModel]:
        with get_db_context(db) as db:
            return [
                FolderModel.model_validate(folder)
                for folder in db.query(Folder).filter_by(user_id=user_id).all()
            ]

    def get_folder_by_parent_id_and_user_id_and_name(
        self, parent_id: Optional[str], user_id: str, name: str, db: Optional[Session] = None
    ) -> Optional[FolderModel]:
        try:
            with get_db_context(db) as db:
                # Check if folder exists
                folder = (
                    db.query(Folder)
                    .filter_by(parent_id=parent_id, user_id=user_id)
                    .filter(Folder.name.ilike(name))
                    .first()
                )

                if not folder:
                    return None

                return FolderModel.model_validate(folder)
        except Exception as e:
            log.error(f"get_folder_by_parent_id_and_user_id_and_name: {e}")
            return None

    def get_folders_by_parent_id_and_user_id(
        self, parent_id: Optional[str], user_id: str, db: Optional[Session] = None
    ) -> list[FolderModel]:
        with get_db_context(db) as db:
            return [
                FolderModel.model_validate(folder)
                for folder in db.query(Folder)
                .filter_by(parent_id=parent_id, user_id=user_id)
                .all()
            ]

    def update_folder_parent_id_by_id_and_user_id(
        self,
        id: str,
        user_id: str,
        parent_id: str,
        db: Optional[Session] = None,
    ) -> Optional[FolderModel]:
        try:
            with get_db_context(db) as db:
                folder = db.query(Folder).filter_by(id=id, user_id=user_id).first()

                if not folder:
                    return None

                folder.parent_id = parent_id
                folder.updated_at = int(time.time())

                db.commit()

                return FolderModel.model_validate(folder)
        except Exception as e:
            log.error(f"update_folder: {e}")
            return

    def update_folder_by_id_and_user_id(
        self, id: str, user_id: str, form_data: FolderUpdateForm, db: Optional[Session] = None
    ) -> Optional[FolderModel]:
        try:
            with get_db_context(db) as db:
                folder = db.query(Folder).filter_by(id=id, user_id=user_id).first()

                if not folder:
                    return None

                form_data = form_data.model_dump(exclude_unset=True)

                existing_folder = (
                    db.query(Folder)
                    .filter_by(
                        name=form_data.get("name"),
                        parent_id=folder.parent_id,
                        user_id=user_id,
                    )
                    .first()
                )

                if existing_folder and existing_folder.id != id:
                    return None

                folder.name = form_data.get("name", folder.name)
                if "data" in form_data:
                    folder.data = {
                        **(folder.data or {}),
                        **form_data["data"],
                    }

                if "meta" in form_data:
                    folder.meta = {
                        **(folder.meta or {}),
                        **form_data["meta"],
                    }

                folder.updated_at = int(time.time())
                db.commit()

                return FolderModel.model_validate(folder)
        except Exception as e:
            log.error(f"update_folder: {e}")
            return

    def update_folder_is_expanded_by_id_and_user_id(
        self, id: str, user_id: str, is_expanded: bool, db: Optional[Session] = None
    ) -> Optional[FolderModel]:
        try:
            with get_db_context(db) as db:
                folder = db.query(Folder).filter_by(id=id, user_id=user_id).first()

                if not folder:
                    return None

                folder.is_expanded = is_expanded
                folder.updated_at = int(time.time())

                db.commit()

                return FolderModel.model_validate(folder)
        except Exception as e:
            log.error(f"update_folder: {e}")
            return

    def delete_folder_by_id_and_user_id(self, id: str, user_id: str, db: Optional[Session] = None) -> list[str]:
        try:
            folder_ids = []
            with get_db_context(db) as db:
                folder = db.query(Folder).filter_by(id=id, user_id=user_id).first()
                if not folder:
                    return folder_ids

                folder_ids.append(folder.id)

                # Delete all children folders
                def delete_children(folder):
                    folder_children = self.get_folders_by_parent_id_and_user_id(
                        folder.id, user_id, db=db
                    )
                    for folder_child in folder_children:

                        delete_children(folder_child)
                        folder_ids.append(folder_child.id)

                        folder = db.query(Folder).filter_by(id=folder_child.id).first()
                        db.delete(folder)
                        db.commit()

                delete_children(folder)
                db.delete(folder)
                db.commit()
                return folder_ids
        except Exception as e:
            log.error(f"delete_folder: {e}")
            return []

    def normalize_folder_name(self, name: str) -> str:
        # Replace _ and space with a single space, lower case, collapse multiple spaces
        name = re.sub(r"[\s_]+", " ", name)
        return name.strip().lower()

    def search_folders_by_names(
        self, user_id: str, queries: list[str], db: Optional[Session] = None
    ) -> list[FolderModel]:
        """
        Search for folders for a user where the name matches any of the queries, treating _ and space as equivalent, case-insensitive.
        """
        normalized_queries = [self.normalize_folder_name(q) for q in queries]
        if not normalized_queries:
            return []

        results = {}
        with get_db_context(db) as db:
            folders = db.query(Folder).filter_by(user_id=user_id).all()
            for folder in folders:
                if self.normalize_folder_name(folder.name) in normalized_queries:
                    results[folder.id] = FolderModel.model_validate(folder)

                    # get children folders
                    children = self.get_children_folders_by_id_and_user_id(
                        folder.id, user_id, db=db
                    )
                    for child in children:
                        results[child.id] = child

        # Return the results as a list
        if not results:
            return []
        else:
            results = list(results.values())
            return results

    def search_folders_by_name_contains(
        self, user_id: str, query: str, db: Optional[Session] = None
    ) -> list[FolderModel]:
        """
        Partial match: normalized name contains (as substring) the normalized query.
        """
        normalized_query = self.normalize_folder_name(query)
        results = []
        with get_db_context(db) as db:
            folders = db.query(Folder).filter_by(user_id=user_id).all()
            for folder in folders:
                norm_name = self.normalize_folder_name(folder.name)
                if normalized_query in norm_name:
                    results.append(FolderModel.model_validate(folder))
        return results


Folders = FolderTable()