from __future__ import annotations

import json
import logging
import re
from collections import defaultdict
from collections.abc import Sequence
from typing import Any

from graphon.nodes.human_input.entities import FormDefinition
from graphon.nodes.human_input.enums import HumanInputFormStatus
from graphon.nodes.human_input.human_input_node import HumanInputNode
from sqlalchemy import select
from sqlalchemy.orm import Session, selectinload, sessionmaker

from core.entities.execution_extra_content import (
    ExecutionExtraContentDomainModel,
    HumanInputFormDefinition,
    HumanInputFormSubmissionData,
)
from core.entities.execution_extra_content import (
    HumanInputContent as HumanInputContentDomainModel,
)
from models.execution_extra_content import (
    ExecutionExtraContent as ExecutionExtraContentModel,
)
from models.execution_extra_content import (
    HumanInputContent as HumanInputContentModel,
)
from models.human_input import HumanInputFormRecipient, RecipientType
from repositories.execution_extra_content_repository import ExecutionExtraContentRepository

logger = logging.getLogger(__name__)

_OUTPUT_VARIABLE_PATTERN = re.compile(r"\{\{#\$output\.(?P<field_name>[a-zA-Z_][a-zA-Z0-9_]{0,29})#\}\}")


def _extract_output_field_names(form_content: str) -> list[str]:
    if not form_content:
        return []
    return [match.group("field_name") for match in _OUTPUT_VARIABLE_PATTERN.finditer(form_content)]


class SQLAlchemyExecutionExtraContentRepository(ExecutionExtraContentRepository):
    def __init__(self, session_maker: sessionmaker[Session]):
        self._session_maker = session_maker

    def get_by_message_ids(self, message_ids: Sequence[str]) -> list[list[ExecutionExtraContentDomainModel]]:
        if not message_ids:
            return []

        grouped_contents: dict[str, list[ExecutionExtraContentDomainModel]] = {
            message_id: [] for message_id in message_ids
        }

        stmt = (
            select(ExecutionExtraContentModel)
            .where(ExecutionExtraContentModel.message_id.in_(message_ids))
            .options(selectinload(HumanInputContentModel.form))
            .order_by(ExecutionExtraContentModel.created_at.asc())
        )

        with self._session_maker() as session:
            results = session.scalars(stmt).all()

            form_ids = {
                content.form_id
                for content in results
                if isinstance(content, HumanInputContentModel) and content.form_id is not None
            }
            recipients_by_form_id: dict[str, list[HumanInputFormRecipient]] = defaultdict(list)
            if form_ids:
                recipient_stmt = select(HumanInputFormRecipient).where(HumanInputFormRecipient.form_id.in_(form_ids))
                recipients = session.scalars(recipient_stmt).all()
                for recipient in recipients:
                    recipients_by_form_id[recipient.form_id].append(recipient)
            else:
                recipients_by_form_id = {}

        for content in results:
            message_id = content.message_id
            if not message_id or message_id not in grouped_contents:
                continue

            domain_model = self._map_model_to_domain(content, recipients_by_form_id)
            if domain_model is None:
                continue

            grouped_contents[message_id].append(domain_model)

        return [grouped_contents[message_id] for message_id in message_ids]

    def _map_model_to_domain(
        self,
        model: ExecutionExtraContentModel,
        recipients_by_form_id: dict[str, list[HumanInputFormRecipient]],
    ) -> ExecutionExtraContentDomainModel | None:
        if isinstance(model, HumanInputContentModel):
            return self._map_human_input_content(model, recipients_by_form_id)

        logger.debug("Unsupported execution extra content type encountered: %s", model.type)
        return None

    def _map_human_input_content(
        self,
        model: HumanInputContentModel,
        recipients_by_form_id: dict[str, list[HumanInputFormRecipient]],
    ) -> HumanInputContentDomainModel | None:
        form = model.form
        if form is None:
            logger.warning("HumanInputContent(id=%s) has no associated form loaded", model.id)
            return None

        try:
            definition_payload = json.loads(form.form_definition)
            if "expiration_time" not in definition_payload:
                definition_payload["expiration_time"] = form.expiration_time
            form_definition = FormDefinition.model_validate(definition_payload)
        except ValueError:
            logger.warning("Failed to load form definition for HumanInputContent(id=%s)", model.id)
            return None
        node_title = form_definition.node_title or form.node_id
        display_in_ui = bool(form_definition.display_in_ui)

        submitted = form.submitted_at is not None or form.status == HumanInputFormStatus.SUBMITTED
        if not submitted:
            form_token = self._resolve_form_token(recipients_by_form_id.get(form.id, []))
            return HumanInputContentDomainModel(
                workflow_run_id=model.workflow_run_id,
                submitted=False,
                form_definition=HumanInputFormDefinition(
                    form_id=form.id,
                    node_id=form.node_id,
                    node_title=node_title,
                    form_content=form.rendered_content,
                    inputs=form_definition.inputs,
                    actions=form_definition.user_actions,
                    display_in_ui=display_in_ui,
                    form_token=form_token,
                    resolved_default_values=form_definition.default_values,
                    expiration_time=int(form.expiration_time.timestamp()),
                ),
            )

        selected_action_id = form.selected_action_id
        if not selected_action_id:
            logger.warning("HumanInputContent(id=%s) form has no selected action", model.id)
            return None

        action_text = next(
            (action.title for action in form_definition.user_actions if action.id == selected_action_id),
            selected_action_id,
        )

        submitted_data: dict[str, Any] = {}
        if form.submitted_data:
            try:
                submitted_data = json.loads(form.submitted_data)
            except ValueError:
                logger.warning("Failed to load submitted data for HumanInputContent(id=%s)", model.id)
                return None

        rendered_content = HumanInputNode.render_form_content_with_outputs(
            form.rendered_content,
            submitted_data,
            _extract_output_field_names(form_definition.form_content),
        )

        return HumanInputContentDomainModel(
            workflow_run_id=model.workflow_run_id,
            submitted=True,
            form_submission_data=HumanInputFormSubmissionData(
                node_id=form.node_id,
                node_title=node_title,
                rendered_content=rendered_content,
                action_id=selected_action_id,
                action_text=action_text,
            ),
        )

    @staticmethod
    def _resolve_form_token(recipients: Sequence[HumanInputFormRecipient]) -> str | None:
        console_recipient = next(
            (recipient for recipient in recipients if recipient.recipient_type == RecipientType.CONSOLE),
            None,
        )
        if console_recipient and console_recipient.access_token:
            return console_recipient.access_token

        web_app_recipient = next(
            (recipient for recipient in recipients if recipient.recipient_type == RecipientType.STANDALONE_WEB_APP),
            None,
        )
        if web_app_recipient and web_app_recipient.access_token:
            return web_app_recipient.access_token

        return None


__all__ = ["SQLAlchemyExecutionExtraContentRepository"]