import json
from datetime import datetime, timedelta
from typing import Any, Dict, List, Optional

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

from api.db import db_client
from api.db.models import UserModel
from api.services.auth.depends import get_user

router = APIRouter(prefix="/organizations")


class CurrentUsageResponse(BaseModel):
    period_start: str
    period_end: str
    used_dograh_tokens: float
    quota_dograh_tokens: int
    percentage_used: float
    next_refresh_date: str
    quota_enabled: bool
    total_duration_seconds: int
    # New USD fields
    used_amount_usd: Optional[float] = None
    quota_amount_usd: Optional[float] = None
    currency: Optional[str] = None
    price_per_second_usd: Optional[float] = None


class WorkflowRunUsageResponse(BaseModel):
    id: int
    workflow_id: int
    workflow_name: Optional[str]
    name: str
    created_at: str
    dograh_token_usage: float
    call_duration_seconds: int
    recording_url: Optional[str] = None
    transcript_url: Optional[str] = None
    phone_number: Optional[str] = None
    disposition: Optional[str] = None
    initial_context: Optional[Dict[str, Any]] = None
    gathered_context: Optional[Dict[str, Any]] = None
    # New USD field
    charge_usd: Optional[float] = None


class UsageHistoryResponse(BaseModel):
    runs: List[WorkflowRunUsageResponse]
    total_dograh_tokens: float
    total_duration_seconds: int
    total_count: int
    page: int
    limit: int
    total_pages: int


class DailyUsageItem(BaseModel):
    date: str
    minutes: float
    cost_usd: Optional[float] = None
    dograh_tokens: float
    call_count: int


class DailyUsageBreakdownResponse(BaseModel):
    breakdown: List[DailyUsageItem]
    total_minutes: float
    total_cost_usd: Optional[float] = None
    total_dograh_tokens: float
    currency: Optional[str] = None


@router.get("/usage/current-period", response_model=CurrentUsageResponse)
async def get_current_period_usage(user: UserModel = Depends(get_user)):
    """Get current billing period usage for the user's organization."""
    if not user.selected_organization_id:
        raise HTTPException(status_code=400, detail="No organization selected")

    try:
        usage = await db_client.get_current_usage(user.selected_organization_id)
        return usage
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/usage/runs", response_model=UsageHistoryResponse)
async def get_usage_history(
    start_date: Optional[str] = Query(None, description="ISO format date string"),
    end_date: Optional[str] = Query(None, description="ISO format date string"),
    page: int = Query(1, ge=1),
    limit: int = Query(50, ge=1, le=100),
    filters: Optional[str] = Query(None, description="JSON string of filters"),
    user: UserModel = Depends(get_user),
):
    """Get paginated workflow runs with usage for the organization."""
    if not user.selected_organization_id:
        raise HTTPException(status_code=400, detail="No organization selected")

    # Parse dates if provided
    start_dt = datetime.fromisoformat(start_date) if start_date else None
    end_dt = datetime.fromisoformat(end_date) if end_date else None

    # Parse filters if provided
    parsed_filters = None
    if filters:
        try:
            parsed_filters = json.loads(filters)
        except json.JSONDecodeError:
            raise HTTPException(status_code=400, detail="Invalid filters format")

    try:
        offset = (page - 1) * limit
        (
            runs,
            total_count,
            total_tokens,
            total_duration,
        ) = await db_client.get_usage_history(
            user.selected_organization_id,
            start_date=start_dt,
            end_date=end_dt,
            limit=limit,
            offset=offset,
            filters=parsed_filters,
        )

        total_pages = (total_count + limit - 1) // limit

        return {
            "runs": runs,
            "total_dograh_tokens": total_tokens,
            "total_duration_seconds": total_duration,
            "total_count": total_count,
            "page": page,
            "limit": limit,
            "total_pages": total_pages,
        }
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/usage/daily-breakdown", response_model=DailyUsageBreakdownResponse)
async def get_daily_usage_breakdown(
    days: int = Query(7, ge=1, le=30, description="Number of days to include"),
    user: UserModel = Depends(get_user),
):
    """Get daily usage breakdown for the last N days. Only available for organizations with pricing."""
    if not user.selected_organization_id:
        raise HTTPException(status_code=400, detail="No organization selected")

    try:
        # Get organization to check if it has pricing
        org = await db_client.get_organization_by_id(user.selected_organization_id)
        if not org or org.price_per_second_usd is None:
            raise HTTPException(
                status_code=400,
                detail="Daily breakdown is only available for organizations with pricing configured",
            )

        # Calculate date range
        end_date = datetime.now()
        start_date = end_date - timedelta(days=days - 1)
        start_date = start_date.replace(hour=0, minute=0, second=0, microsecond=0)

        # Get daily breakdown
        breakdown = await db_client.get_daily_usage_breakdown(
            user.selected_organization_id,
            start_date,
            end_date,
            org.price_per_second_usd,
            user_id=user.id,
        )

        return breakdown
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))