from loguru import logger

from api.db import db_client
from api.enums import WorkflowRunMode
from api.services.pricing.cost_calculator import cost_calculator
from api.services.telephony.factory import get_telephony_provider_for_run


async def _fetch_telephony_cost(workflow_run) -> dict | None:
    """Fetch telephony call cost. Returns a dict with cost_usd and provider_name, or None."""
    if (
        workflow_run.mode
        not in [WorkflowRunMode.TWILIO.value, WorkflowRunMode.VONAGE.value]
        or not workflow_run.cost_info
    ):
        return None

    call_id = workflow_run.cost_info.get("call_id")
    if not call_id:
        logger.warning(f"call_id not found in cost_info")
        return None

    provider_name = workflow_run.mode.lower() if workflow_run.mode else ""

    workflow = await db_client.get_workflow_by_id(workflow_run.workflow_id)
    if not workflow:
        logger.warning("Workflow not found for workflow run")
        raise Exception("Workflow not found")

    provider = await get_telephony_provider_for_run(
        workflow_run, workflow.organization_id
    )
    call_cost_info = await provider.get_call_cost(call_id)

    if call_cost_info.get("status") == "error":
        logger.error(
            f"Failed to fetch {provider_name} call cost: {call_cost_info.get('error')}"
        )
        return None

    cost_usd = call_cost_info.get("cost_usd", 0.0)
    logger.info(
        f"{provider_name.title()} call cost: ${cost_usd:.6f} USD for call {call_id}"
    )
    return {"cost_usd": cost_usd, "provider_name": provider_name}


async def _update_organization_usage(
    org, dograh_tokens: float, duration_seconds: float, charge_usd: float | None
) -> None:
    """Update organization usage after a workflow run."""
    org_id = org.id
    await db_client.update_usage_after_run(
        org_id, dograh_tokens, duration_seconds, charge_usd
    )
    if charge_usd is not None:
        logger.info(
            f"Updated organization usage with ${charge_usd:.2f} USD ({dograh_tokens} Dograh Tokens) and {duration_seconds}s duration for org {org_id}"
        )
    else:
        logger.info(
            f"Updated organization usage with {dograh_tokens} Dograh Tokens and {duration_seconds}s duration for org {org_id}"
        )


async def calculate_workflow_run_cost(workflow_run_id: int):
    logger.debug("Calculating cost for workflow run")

    workflow_run = await db_client.get_workflow_run_by_id(workflow_run_id)
    if not workflow_run:
        logger.warning("Workflow run not found")
        return

    workflow_usage_info = workflow_run.usage_info
    if not workflow_usage_info:
        logger.warning("No usage info available for workflow run")
        return

    try:
        # Calculate cost breakdown
        cost_breakdown = cost_calculator.calculate_total_cost(workflow_usage_info)

        # Fetch telephony call cost
        try:
            telephony_cost = await _fetch_telephony_cost(workflow_run)
            if telephony_cost:
                telephony_cost_usd = telephony_cost["cost_usd"]
                provider_name = telephony_cost["provider_name"]
                cost_breakdown["telephony_call"] = telephony_cost_usd
                cost_breakdown[f"{provider_name}_call"] = telephony_cost_usd
                cost_breakdown["total"] = (
                    float(cost_breakdown["total"]) + telephony_cost_usd
                )
        except Exception as e:
            logger.error(f"Failed to fetch telephony call cost: {e}")
            # Don't fail the whole cost calculation if telephony API fails

        # Store cost information back to the workflow run
        # Convert USD to Dograh Tokens (1 cent = 1 token)
        dograh_tokens = round(float(cost_breakdown["total"]) * 100, 2)

        # Get organization to check if it has USD pricing
        org = None
        charge_usd = None
        if (
            workflow_run.workflow
            and workflow_run.workflow.user
            and workflow_run.workflow.user.selected_organization_id
        ):
            org = await db_client.get_organization_by_id(
                workflow_run.workflow.user.selected_organization_id
            )

        # Calculate USD cost if organization has pricing configured
        if org and org.price_per_second_usd:
            duration_seconds = workflow_usage_info.get("call_duration_seconds", 0)
            charge_usd = duration_seconds * org.price_per_second_usd

        cost_info = {
            **workflow_run.cost_info,
            "cost_breakdown": cost_breakdown,
            "total_cost_usd": float(cost_breakdown["total"]),
            "dograh_token_usage": dograh_tokens,
            "calculated_at": workflow_run.created_at.isoformat(),
            "call_duration_seconds": workflow_usage_info["call_duration_seconds"],
        }

        # Add USD cost if available
        if charge_usd is not None:
            cost_info["charge_usd"] = charge_usd
            cost_info["price_per_second_usd"] = org.price_per_second_usd

        # Update workflow run with cost information
        await db_client.update_workflow_run(run_id=workflow_run_id, cost_info=cost_info)

        # Update organization usage if applicable
        if org:
            try:
                duration_seconds = workflow_usage_info.get("call_duration_seconds", 0)
                await _update_organization_usage(
                    org, dograh_tokens, duration_seconds, charge_usd
                )
            except Exception as e:
                logger.error(
                    f"Failed to update organization usage for org {org.id}: {e}"
                )
                # Don't fail the whole task if usage update fails

        logger.info(
            f"Calculated cost for workflow run: ${cost_breakdown['total']:.6f} USD ({dograh_tokens} Dograh Tokens)"
        )

    except Exception as e:
        logger.error(f"Error calculating cost for workflow run: {e}")
        raise