"""Service for creating new Forgejo issues from Pipeline and caching them locally."""

from __future__ import annotations

from typing import TYPE_CHECKING
from uuid import UUID

from sqlmodel import select

from app.core.logging import get_logger
from app.core.time import utcnow
from app.db import crud
from app.models.board_repository_links import BoardRepositoryLink
from app.models.forgejo_connections import ForgejoConnection
from app.models.forgejo_issues import ForgejoIssue
from app.models.forgejo_repositories import ForgejoRepository
from app.services.forgejo_client import get_forgejo_client

if TYPE_CHECKING:
    from sqlalchemy.ext.asyncio.session import AsyncSession

logger = get_logger(__name__)


class CreateIssueError(Exception):
    """Base exception for issue creation errors."""


class CreateIssueNotFoundError(CreateIssueError):
    """Raised when a required repository or connection is not found."""


class CreateIssueRemoteError(CreateIssueError):
    """Raised when the Forgejo API call fails."""


async def create_issue_on_repository(
    session: AsyncSession,
    *,
    repository: ForgejoRepository,
    title: str,
    body: str,
    labels: list[int] | None = None,
) -> ForgejoIssue:
    """Create an issue on Forgejo and cache it locally.

    Raises:
        CreateIssueNotFoundError: If the connection is not found.
        CreateIssueRemoteError: If the Forgejo API call fails.
    """
    connection = await crud.get_by_id(session, ForgejoConnection, repository.connection_id)
    if connection is None:
        raise CreateIssueNotFoundError("Repository connection not found")

    try:
        async with get_forgejo_client(connection) as client:
            raw = await client.create_issue(
                owner=repository.owner,
                repo=repository.repo,
                title=title,
                body=body,
                labels=labels,
            )
    except Exception as exc:
        raise CreateIssueRemoteError(f"Failed to create issue on Forgejo: {exc}") from exc

    now = utcnow()
    raw_number = raw.get("number", 0)
    forgejo_number = int(raw_number) if isinstance(raw_number, int | float) else 0
    raw_body = raw.get("body") or ""
    raw_user = raw.get("user")
    author = (
        raw_user.get("login", "") if isinstance(raw_user, dict) else ""
    )
    html_url = str(raw.get("html_url", ""))
    raw_created = raw.get("created_at")
    forgejo_created_at = now
    if isinstance(raw_created, str):
        try:
            from datetime import datetime
            forgejo_created_at = datetime.fromisoformat(
                raw_created.replace("Z", "+00:00")
            ).replace(tzinfo=None)
        except ValueError:
            pass

    issue = ForgejoIssue(
        organization_id=repository.organization_id,
        repository_id=repository.id,
        forgejo_issue_number=forgejo_number,
        title=title,
        body=raw_body or body,
        body_preview=(raw_body or body)[:1000],
        state="open",
        is_pull_request=False,
        labels=[],
        assignees=[],
        author=author,
        html_url=html_url,
        forgejo_created_at=forgejo_created_at,
        forgejo_updated_at=forgejo_created_at,
        forgejo_payload=dict(raw) if isinstance(raw, dict) else None,
        last_synced_at=now,
    )
    session.add(issue)
    await session.flush()

    logger.info(
        "forgejo.issue.created",
        extra={
            "issue_id": str(issue.id),
            "forgejo_issue_number": forgejo_number,
            "repository_id": str(repository.id),
            "organization_id": str(repository.organization_id),
        },
    )
    return issue


async def create_issue_on_board_repositories(
    session: AsyncSession,
    *,
    board_id: UUID,
    organization_id: UUID,
    title: str,
    body: str,
    labels: list[int] | None = None,
) -> list[ForgejoIssue]:
    """Create an issue on all repositories linked to a board.

    Returns a list of created ForgejoIssue records (one per linked repository).
    Repositories that fail are logged and skipped.
    """
    links = (
        await session.exec(
            select(BoardRepositoryLink).where(
                BoardRepositoryLink.board_id == board_id,
                BoardRepositoryLink.organization_id == organization_id,
            )
        )
    ).all()

    created: list[ForgejoIssue] = []
    for link in links:
        repository = await crud.get_by_id(session, ForgejoRepository, link.repository_id)
        if repository is None:
            continue
        try:
            issue = await create_issue_on_repository(
                session,
                repository=repository,
                title=title,
                body=body,
                labels=labels,
            )
            created.append(issue)
        except CreateIssueError as exc:
            logger.warning(
                "error_escalation.issue_create_failed",
                extra={
                    "board_id": str(board_id),
                    "repository_id": str(link.repository_id),
                    "error": str(exc),
                },
            )
    return created