# ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========

from datetime import datetime
from enum import IntEnum

from pydantic import BaseModel, model_validator
from sqlalchemy import Float, Integer
from sqlalchemy_utils import ChoiceType
from sqlmodel import JSON, Column, Field, SmallInteger, String

from app.model.abstract.model import AbstractModel, DefaultTimes


class ChatStatus(IntEnum):
    ongoing = 1
    done = 2


class ChatHistory(AbstractModel, DefaultTimes, table=True):
    """
    Chat history model with timestamp tracking.

    Inherits from DefaultTimes which provides:
    - created_at: timestamp when record is created (auto-populated)
    - updated_at: timestamp when record is last modified (auto-updated)
    - deleted_at: timestamp for soft deletion (nullable)

    For legacy records without timestamps, sorting falls back to id ordering.
    """

    id: int = Field(default=None, primary_key=True)
    user_id: int = Field(index=True)
    task_id: str = Field(index=True, unique=True)
    project_id: str = Field(index=True, unique=False, nullable=True)
    question: str
    language: str
    model_platform: str
    model_type: str
    api_key: str
    api_url: str = Field(sa_column=Column(String(500)))
    max_retries: int = Field(default=3)
    file_save_path: str | None = None
    installed_mcp: str = Field(sa_type=JSON, default={})
    project_name: str = Field(default="", sa_column=Column(String(128)))
    summary: str = Field(default="", sa_column=Column(String(1024)))
    tokens: int = Field(default=0, sa_column=(Column(Integer, server_default="0")))
    spend: float = Field(default=0, sa_column=(Column(Float, server_default="0")))
    status: int = Field(default=1, sa_column=Column(ChoiceType(ChatStatus, SmallInteger())))


class ChatHistoryIn(BaseModel):
    task_id: str
    project_id: str | None = None
    user_id: int | None = None
    question: str
    language: str
    model_platform: str
    model_type: str
    api_key: str | None = ""
    api_url: str | None = None
    max_retries: int = 3
    file_save_path: str | None = None
    installed_mcp: str | None = None
    project_name: str | None = None
    summary: str | None = None
    tokens: int = 0
    spend: float = 0
    status: int = ChatStatus.ongoing.value


class ChatHistoryOut(BaseModel):
    id: int
    task_id: str
    project_id: str | None = None
    question: str
    language: str
    model_platform: str
    model_type: str
    api_key: str | None = None
    api_url: str | None = None
    max_retries: int
    file_save_path: str | None = None
    installed_mcp: str | None = None
    project_name: str | None = None
    summary: str | None = None
    tokens: int
    status: int
    created_at: datetime | None = None
    updated_at: datetime | None = None

    @model_validator(mode="after")
    def fill_project_id_from_task_id(self):
        """Fill project_id from task_id when project_id is None"""
        if self.project_id is None:
            self.project_id = self.task_id
        return self

    @model_validator(mode="after")
    def handle_legacy_timestamps(self):
        """Handle legacy records that might not have timestamp fields"""
        # For old records without timestamps, we rely on database-level defaults
        # The sorting in the controller will handle ordering appropriately
        return self


class ChatHistoryUpdate(BaseModel):
    project_name: str | None = None
    summary: str | None = None
    tokens: int | None = None
    status: int | None = None
    project_id: str | None = None