from typing import List, Optional, Union

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel

from api.constants import DEFAULT_CAMPAIGN_RETRY_CONFIG, DEFAULT_ORG_CONCURRENCY_LIMIT
from api.db import db_client
from api.db.models import UserModel
from api.enums import OrganizationConfigurationKey
from api.schemas.telephony_config import (
    ARIConfigurationRequest,
    ARIConfigurationResponse,
    CloudonixConfigurationRequest,
    CloudonixConfigurationResponse,
    TelephonyConfigurationResponse,
    TwilioConfigurationRequest,
    TwilioConfigurationResponse,
    VobizConfigurationRequest,
    VobizConfigurationResponse,
    VonageConfigurationRequest,
    VonageConfigurationResponse,
)
from api.services.auth.depends import get_user
from api.services.configuration.masking import is_mask_of, mask_key

router = APIRouter(prefix="/organizations", tags=["organizations"])

# Provider configuration constants
PROVIDER_MASKED_FIELDS = {
    "twilio": ["account_sid", "auth_token"],
    "vonage": ["private_key", "api_key", "api_secret"],
    "vobiz": ["auth_id", "auth_token"],
    "cloudonix": ["bearer_token"],
    "ari": ["app_password"],
}


# TODO: Make endpoints provider-agnostic
@router.get("/telephony-config", response_model=TelephonyConfigurationResponse)
async def get_telephony_configuration(user: UserModel = Depends(get_user)):
    """Get telephony configuration for the user's organization with masked sensitive fields."""
    if not user.selected_organization_id:
        raise HTTPException(status_code=400, detail="No organization selected")

    config = await db_client.get_configuration(
        user.selected_organization_id,
        OrganizationConfigurationKey.TELEPHONY_CONFIGURATION.value,
    )

    if not config or not config.value:
        return TelephonyConfigurationResponse()

    stored_provider = config.value.get("provider", "twilio")

    if stored_provider == "twilio":
        account_sid = config.value.get("account_sid", "")
        auth_token = config.value.get("auth_token", "")
        from_numbers = (
            config.value.get("from_numbers", []) if account_sid and auth_token else []
        )

        return TelephonyConfigurationResponse(
            twilio=TwilioConfigurationResponse(
                provider="twilio",
                account_sid=mask_key(account_sid) if account_sid else "",
                auth_token=mask_key(auth_token) if auth_token else "",
                from_numbers=from_numbers,
            ),
            vonage=None,
            vobiz=None,
            cloudonix=None,
        )
    elif stored_provider == "vonage":
        application_id = config.value.get("application_id", "")
        private_key = config.value.get("private_key", "")
        api_key = config.value.get("api_key", "")
        api_secret = config.value.get("api_secret", "")
        from_numbers = (
            config.value.get("from_numbers", [])
            if application_id and private_key
            else []
        )

        return TelephonyConfigurationResponse(
            twilio=None,
            vonage=VonageConfigurationResponse(
                provider="vonage",
                application_id=application_id,
                private_key=mask_key(private_key) if private_key else "",
                api_key=mask_key(api_key) if api_key else None,
                api_secret=mask_key(api_secret) if api_secret else None,
                from_numbers=from_numbers,
            ),
            vobiz=None,
            cloudonix=None,
        )
    elif stored_provider == "vobiz":
        auth_id = config.value.get("auth_id", "")
        auth_token = config.value.get("auth_token", "")
        from_numbers = (
            config.value.get("from_numbers", []) if auth_id and auth_token else []
        )

        return TelephonyConfigurationResponse(
            twilio=None,
            vonage=None,
            vobiz=VobizConfigurationResponse(
                provider="vobiz",
                auth_id=mask_key(auth_id) if auth_id else "",
                auth_token=mask_key(auth_token) if auth_token else "",
                from_numbers=from_numbers,
            ),
            cloudonix=None,
        )
    elif stored_provider == "cloudonix":
        bearer_token = config.value.get("bearer_token", "")
        domain_id = config.value.get("domain_id", "")
        from_numbers = config.value.get("from_numbers", [])

        return TelephonyConfigurationResponse(
            twilio=None,
            vonage=None,
            cloudonix=CloudonixConfigurationResponse(
                provider="cloudonix",
                bearer_token=mask_key(bearer_token) if bearer_token else "",
                domain_id=domain_id,
                from_numbers=from_numbers,
            ),
            vobiz=None,
        )
    elif stored_provider == "ari":
        ari_endpoint = config.value.get("ari_endpoint", "")
        app_name = config.value.get("app_name", "")
        app_password = config.value.get("app_password", "")
        ws_client_name = config.value.get("ws_client_name", "")
        from_numbers = config.value.get("from_numbers", [])

        inbound_workflow_id = config.value.get("inbound_workflow_id")

        return TelephonyConfigurationResponse(
            ari=ARIConfigurationResponse(
                provider="ari",
                ari_endpoint=ari_endpoint,
                app_name=app_name,
                app_password=mask_key(app_password) if app_password else "",
                ws_client_name=ws_client_name,
                inbound_workflow_id=inbound_workflow_id,
                from_numbers=from_numbers,
            ),
        )
    else:
        return TelephonyConfigurationResponse()


@router.post("/telephony-config")
async def save_telephony_configuration(
    request: Union[
        TwilioConfigurationRequest,
        VonageConfigurationRequest,
        VobizConfigurationRequest,
        CloudonixConfigurationRequest,
        ARIConfigurationRequest,
    ],
    user: UserModel = Depends(get_user),
):
    """Save telephony configuration for the user's organization."""
    if not user.selected_organization_id:
        raise HTTPException(status_code=400, detail="No organization selected")

    # Fetch existing configuration to handle masked values
    existing_config = await db_client.get_configuration(
        user.selected_organization_id,
        OrganizationConfigurationKey.TELEPHONY_CONFIGURATION.value,
    )

    # Build single-provider configuration
    if request.provider == "twilio":
        config_value = {
            "provider": "twilio",
            "account_sid": request.account_sid,
            "auth_token": request.auth_token,
            "from_numbers": request.from_numbers,
        }
    elif request.provider == "vonage":
        config_value = {
            "provider": "vonage",
            "application_id": request.application_id,
            "private_key": request.private_key,
            "api_key": getattr(request, "api_key", None),
            "api_secret": getattr(request, "api_secret", None),
            "from_numbers": request.from_numbers,
        }
    elif request.provider == "vobiz":
        config_value = {
            "provider": "vobiz",
            "auth_id": request.auth_id,
            "auth_token": request.auth_token,
            "from_numbers": request.from_numbers,
        }
    elif request.provider == "cloudonix":
        config_value = {
            "provider": "cloudonix",
            "bearer_token": request.bearer_token,
            "domain_id": request.domain_id,
            "from_numbers": request.from_numbers,
        }
    elif request.provider == "ari":
        config_value = {
            "provider": "ari",
            "ari_endpoint": request.ari_endpoint,
            "app_name": request.app_name,
            "app_password": request.app_password,
            "ws_client_name": request.ws_client_name,
            "inbound_workflow_id": request.inbound_workflow_id,
            "from_numbers": request.from_numbers,
        }
    else:
        raise HTTPException(
            status_code=400, detail=f"Unsupported provider: {request.provider}"
        )

    if existing_config and existing_config.value:
        existing_provider = existing_config.value.get("provider")

        if existing_provider == request.provider:
            preserve_masked_fields(request, existing_config, config_value)

    await db_client.upsert_configuration(
        user.selected_organization_id,
        OrganizationConfigurationKey.TELEPHONY_CONFIGURATION.value,
        config_value,
    )

    return {"message": "Telephony configuration saved successfully"}


def preserve_masked_fields(request, existing_config, config_value):
    provider = request.provider
    masked_fields = PROVIDER_MASKED_FIELDS.get(provider, [])

    for field_name in masked_fields:
        if hasattr(request, field_name):
            field_value = getattr(request, field_name)
            # Check if field has a value and is a masked version of the existing value
            if field_value and is_mask_of(
                field_value, existing_config.value.get(field_name, "")
            ):
                config_value[field_name] = existing_config.value[field_name]


class RetryConfigResponse(BaseModel):
    enabled: bool
    max_retries: int
    retry_delay_seconds: int
    retry_on_busy: bool
    retry_on_no_answer: bool
    retry_on_voicemail: bool


class TimeSlotResponse(BaseModel):
    day_of_week: int
    start_time: str
    end_time: str


class ScheduleConfigResponse(BaseModel):
    enabled: bool
    timezone: str
    slots: List[TimeSlotResponse]


class CircuitBreakerConfigResponse(BaseModel):
    enabled: bool = False
    failure_threshold: float = 0.5
    window_seconds: int = 120
    min_calls_in_window: int = 5


class LastCampaignSettingsResponse(BaseModel):
    retry_config: Optional[RetryConfigResponse] = None
    max_concurrency: Optional[int] = None
    schedule_config: Optional[ScheduleConfigResponse] = None
    circuit_breaker: Optional[CircuitBreakerConfigResponse] = None


class CampaignDefaultsResponse(BaseModel):
    concurrent_call_limit: int
    from_numbers_count: int
    default_retry_config: RetryConfigResponse
    last_campaign_settings: Optional[LastCampaignSettingsResponse] = None


@router.get("/campaign-defaults", response_model=CampaignDefaultsResponse)
async def get_campaign_defaults(user: UserModel = Depends(get_user)):
    """Get campaign limits for the user's organization.

    Returns the organization's concurrent call limit and default retry configuration.
    """
    if not user.selected_organization_id:
        raise HTTPException(status_code=400, detail="No organization selected")

    # Get concurrent call limit
    concurrent_limit = DEFAULT_ORG_CONCURRENCY_LIMIT
    try:
        config = await db_client.get_configuration(
            user.selected_organization_id,
            OrganizationConfigurationKey.CONCURRENT_CALL_LIMIT.value,
        )
        if config and config.value:
            concurrent_limit = int(
                config.value.get("value", DEFAULT_ORG_CONCURRENCY_LIMIT)
            )
    except Exception:
        pass

    # Get from_numbers count from telephony configuration
    from_numbers_count = 0
    try:
        telephony_config = await db_client.get_configuration(
            user.selected_organization_id,
            OrganizationConfigurationKey.TELEPHONY_CONFIGURATION.value,
        )
        if telephony_config and telephony_config.value:
            from_numbers = telephony_config.value.get("from_numbers", [])
            from_numbers_count = len(from_numbers)
    except Exception:
        pass

    # Get last campaign settings for pre-population
    last_campaign_settings = None
    try:
        last_campaign = await db_client.get_latest_campaign(
            user.selected_organization_id
        )
        if last_campaign:
            retry = None
            if last_campaign.retry_config:
                retry = RetryConfigResponse(**last_campaign.retry_config)

            max_conc = None
            sched = None
            cb = CircuitBreakerConfigResponse()
            if last_campaign.orchestrator_metadata:
                max_conc = last_campaign.orchestrator_metadata.get("max_concurrency")
                sc = last_campaign.orchestrator_metadata.get("schedule_config")
                if sc:
                    sched = ScheduleConfigResponse(
                        enabled=sc.get("enabled", False),
                        timezone=sc.get("timezone", "UTC"),
                        slots=[
                            TimeSlotResponse(**slot) for slot in sc.get("slots", [])
                        ],
                    )
                cb_data = last_campaign.orchestrator_metadata.get("circuit_breaker")
                if cb_data:
                    cb = CircuitBreakerConfigResponse(**cb_data)
                else:
                    cb = CircuitBreakerConfigResponse()

            last_campaign_settings = LastCampaignSettingsResponse(
                retry_config=retry,
                max_concurrency=max_conc,
                schedule_config=sched,
                circuit_breaker=cb,
            )
    except Exception:
        pass

    return CampaignDefaultsResponse(
        concurrent_call_limit=concurrent_limit,
        from_numbers_count=from_numbers_count,
        default_retry_config=RetryConfigResponse(**DEFAULT_CAMPAIGN_RETRY_CONFIG),
        last_campaign_settings=last_campaign_settings,
    )