import logging
import time
from typing import Optional

from sqlalchemy.orm import Session
from open_webui.internal.db import Base, JSONField, get_db, get_db_context
from open_webui.models.users import Users, UserResponse
from open_webui.models.groups import Groups
from open_webui.models.access_grants import AccessGrantModel, AccessGrants

from pydantic import BaseModel, ConfigDict, Field
from sqlalchemy import BigInteger, Boolean, Column, String, Text


log = logging.getLogger(__name__)

####################
# Skills DB Schema
####################


class Skill(Base):
    __tablename__ = "skill"

    id = Column(String, primary_key=True, unique=True)
    user_id = Column(String)
    name = Column(Text, unique=True)
    description = Column(Text, nullable=True)
    content = Column(Text)
    meta = Column(JSONField)
    is_active = Column(Boolean, default=True)

    updated_at = Column(BigInteger)
    created_at = Column(BigInteger)


class SkillMeta(BaseModel):
    tags: Optional[list[str]] = []


class SkillModel(BaseModel):
    id: str
    user_id: str
    name: str
    description: Optional[str] = None
    content: str
    meta: SkillMeta
    is_active: bool = True
    access_grants: list[AccessGrantModel] = Field(default_factory=list)

    updated_at: int  # timestamp in epoch
    created_at: int  # timestamp in epoch

    model_config = ConfigDict(from_attributes=True)


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


class SkillUserModel(SkillModel):
    user: Optional[UserResponse] = None


class SkillResponse(BaseModel):
    id: str
    user_id: str
    name: str
    description: Optional[str] = None
    meta: SkillMeta
    is_active: bool = True
    access_grants: list[AccessGrantModel] = Field(default_factory=list)
    updated_at: int  # timestamp in epoch
    created_at: int  # timestamp in epoch


class SkillUserResponse(SkillResponse):
    user: Optional[UserResponse] = None

    model_config = ConfigDict(extra="allow")


class SkillAccessResponse(SkillUserResponse):
    write_access: Optional[bool] = False


class SkillForm(BaseModel):
    id: str
    name: str
    description: Optional[str] = None
    content: str
    meta: SkillMeta = SkillMeta()
    is_active: bool = True
    access_grants: Optional[list[dict]] = None


class SkillsTable:
    def _get_access_grants(
        self, skill_id: str, db: Optional[Session] = None
    ) -> list[AccessGrantModel]:
        return AccessGrants.get_grants_by_resource("skill", skill_id, db=db)

    def _to_skill_model(self, skill: Skill, db: Optional[Session] = None) -> SkillModel:
        skill_data = SkillModel.model_validate(skill).model_dump(exclude={"access_grants"})
        skill_data["access_grants"] = self._get_access_grants(skill_data["id"], db=db)
        return SkillModel.model_validate(skill_data)

    def insert_new_skill(
        self,
        user_id: str,
        form_data: SkillForm,
        db: Optional[Session] = None,
    ) -> Optional[SkillModel]:
        with get_db_context(db) as db:
            try:
                result = Skill(
                    **{
                        **form_data.model_dump(exclude={"access_grants"}),
                        "user_id": user_id,
                        "updated_at": int(time.time()),
                        "created_at": int(time.time()),
                    }
                )
                db.add(result)
                db.commit()
                db.refresh(result)
                AccessGrants.set_access_grants(
                    "skill", result.id, form_data.access_grants, db=db
                )
                if result:
                    return self._to_skill_model(result, db=db)
                else:
                    return None
            except Exception as e:
                log.exception(f"Error creating a new skill: {e}")
                return None

    def get_skill_by_id(
        self, id: str, db: Optional[Session] = None
    ) -> Optional[SkillModel]:
        try:
            with get_db_context(db) as db:
                skill = db.get(Skill, id)
                return self._to_skill_model(skill, db=db) if skill else None
        except Exception:
            return None

    def get_skill_by_name(
        self, name: str, db: Optional[Session] = None
    ) -> Optional[SkillModel]:
        try:
            with get_db_context(db) as db:
                skill = db.query(Skill).filter_by(name=name).first()
                return self._to_skill_model(skill, db=db) if skill else None
        except Exception:
            return None

    def get_skills(self, db: Optional[Session] = None) -> list[SkillUserModel]:
        with get_db_context(db) as db:
            all_skills = db.query(Skill).order_by(Skill.updated_at.desc()).all()

            user_ids = list(set(skill.user_id for skill in all_skills))

            users = Users.get_users_by_user_ids(user_ids, db=db) if user_ids else []
            users_dict = {user.id: user for user in users}

            skills = []
            for skill in all_skills:
                user = users_dict.get(skill.user_id)
                skills.append(
                    SkillUserModel.model_validate(
                        {
                            **self._to_skill_model(skill, db=db).model_dump(),
                            "user": user.model_dump() if user else None,
                        }
                    )
                )
            return skills

    def get_skills_by_user_id(
        self, user_id: str, permission: str = "write", db: Optional[Session] = None
    ) -> list[SkillUserModel]:
        skills = self.get_skills(db=db)
        user_group_ids = {
            group.id for group in Groups.get_groups_by_member_id(user_id, db=db)
        }

        return [
            skill
            for skill in skills
            if skill.user_id == user_id
            or AccessGrants.has_access(
                user_id=user_id,
                resource_type="skill",
                resource_id=skill.id,
                permission=permission,
                user_group_ids=user_group_ids,
                db=db,
            )
        ]

    def update_skill_by_id(
        self, id: str, updated: dict, db: Optional[Session] = None
    ) -> Optional[SkillModel]:
        try:
            with get_db_context(db) as db:
                access_grants = updated.pop("access_grants", None)
                db.query(Skill).filter_by(id=id).update(
                    {**updated, "updated_at": int(time.time())}
                )
                db.commit()
                if access_grants is not None:
                    AccessGrants.set_access_grants("skill", id, access_grants, db=db)

                skill = db.query(Skill).get(id)
                db.refresh(skill)
                return self._to_skill_model(skill, db=db)
        except Exception:
            return None

    def toggle_skill_by_id(
        self, id: str, db: Optional[Session] = None
    ) -> Optional[SkillModel]:
        with get_db_context(db) as db:
            try:
                skill = db.query(Skill).filter_by(id=id).first()
                if not skill:
                    return None

                skill.is_active = not skill.is_active
                skill.updated_at = int(time.time())
                db.commit()
                db.refresh(skill)

                return self._to_skill_model(skill, db=db)
            except Exception:
                return None

    def delete_skill_by_id(self, id: str, db: Optional[Session] = None) -> bool:
        try:
            with get_db_context(db) as db:
                AccessGrants.revoke_all_access("skill", id, db=db)
                db.query(Skill).filter_by(id=id).delete()
                db.commit()

                return True
        except Exception:
            return False


Skills = SkillsTable()