"""SQLAlchemy repository for generated HTML pages and favorites."""

from __future__ import annotations

from datetime import datetime
from typing import Any

from sqlalchemy import delete, select
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker

from deerflow.persistence.html_pages.base import HtmlPageStore
from deerflow.persistence.html_pages.model import HtmlPageFavoriteRow, ScheduledHtmlPageRow


def _to_dict(row) -> dict[str, Any]:
    data = row.to_dict()
    for key in ("created_at", "updated_at"):
        value = data.get(key)
        if isinstance(value, datetime):
            data[key] = value.isoformat()
    # Normalize the JSON column names to API-friendly keys.
    if "data_snapshot_json" in data:
        data["data_snapshot"] = data.pop("data_snapshot_json") or {}
    if "prompt_snapshot_json" in data:
        data["prompt_snapshot"] = data.pop("prompt_snapshot_json") or {}
    if "tags_json" in data:
        data["tags"] = data.pop("tags_json") or []
    return data


class HtmlPageRepository(HtmlPageStore):
    def __init__(self, session_factory: async_sessionmaker[AsyncSession]) -> None:
        self._sf = session_factory

    # --- Generated pages ---

    async def create_page(self, data: dict[str, Any]) -> dict[str, Any]:
        row = ScheduledHtmlPageRow(
            id=data["id"],
            task_id=data["task_id"],
            run_id=data["run_id"],
            user_id=data["user_id"],
            title=data.get("title") or "",
            html_content=data.get("html_content") or "",
            html_file_path=data.get("html_file_path"),
            data_snapshot_json=data.get("data_snapshot") or {},
            prompt_snapshot_json=data.get("prompt_snapshot") or {},
            reference_favorite_id=data.get("reference_favorite_id"),
            style_summary=data.get("style_summary"),
            layout_summary=data.get("layout_summary"),
        )
        async with self._sf() as session:
            session.add(row)
            await session.commit()
            await session.refresh(row)
            return _to_dict(row)

    async def get_page(self, page_id: str) -> dict[str, Any] | None:
        async with self._sf() as session:
            row = await session.get(ScheduledHtmlPageRow, page_id)
            return _to_dict(row) if row is not None else None

    async def get_page_by_run(self, run_id: str) -> dict[str, Any] | None:
        async with self._sf() as session:
            result = await session.execute(
                select(ScheduledHtmlPageRow)
                .where(ScheduledHtmlPageRow.run_id == run_id)
                .order_by(ScheduledHtmlPageRow.created_at.desc())
                .limit(1)
            )
            row = result.scalar_one_or_none()
            return _to_dict(row) if row is not None else None

    async def latest_page_for_task(self, task_id: str) -> dict[str, Any] | None:
        async with self._sf() as session:
            result = await session.execute(
                select(ScheduledHtmlPageRow)
                .where(ScheduledHtmlPageRow.task_id == task_id)
                .order_by(ScheduledHtmlPageRow.created_at.desc())
                .limit(1)
            )
            row = result.scalar_one_or_none()
            return _to_dict(row) if row is not None else None

    # --- Favorites ---

    async def create_favorite(self, data: dict[str, Any]) -> dict[str, Any]:
        row = HtmlPageFavoriteRow(
            id=data["id"],
            user_id=data["user_id"],
            page_id=data["page_id"],
            title=data.get("title") or "",
            description=data.get("description"),
            tags_json=data.get("tags") or [],
            html_snapshot=data.get("html_snapshot") or "",
            style_summary=data.get("style_summary"),
            layout_summary=data.get("layout_summary"),
            content_structure_summary=data.get("content_structure_summary"),
            reuse_prompt=data.get("reuse_prompt"),
        )
        async with self._sf() as session:
            session.add(row)
            await session.commit()
            await session.refresh(row)
            return _to_dict(row)

    async def list_favorites(self, user_id: str, *, limit: int = 100) -> list[dict[str, Any]]:
        async with self._sf() as session:
            result = await session.execute(
                select(HtmlPageFavoriteRow)
                .where(HtmlPageFavoriteRow.user_id == user_id)
                .order_by(HtmlPageFavoriteRow.created_at.desc())
                .limit(max(1, limit))
            )
            return [_to_dict(row) for row in result.scalars()]

    async def get_favorite(self, favorite_id: str) -> dict[str, Any] | None:
        async with self._sf() as session:
            row = await session.get(HtmlPageFavoriteRow, favorite_id)
            return _to_dict(row) if row is not None else None

    async def get_favorite_by_page(self, user_id: str, page_id: str) -> dict[str, Any] | None:
        async with self._sf() as session:
            result = await session.execute(
                select(HtmlPageFavoriteRow)
                .where(HtmlPageFavoriteRow.user_id == user_id, HtmlPageFavoriteRow.page_id == page_id)
                .limit(1)
            )
            row = result.scalar_one_or_none()
            return _to_dict(row) if row is not None else None

    async def delete_favorite(self, favorite_id: str, user_id: str) -> bool:
        async with self._sf() as session:
            result = await session.execute(
                delete(HtmlPageFavoriteRow).where(
                    HtmlPageFavoriteRow.id == favorite_id,
                    HtmlPageFavoriteRow.user_id == user_id,
                )
            )
            await session.commit()
            return (result.rowcount or 0) > 0