"""
Comprehensive Test Suite for Mirchi Trading Backend

Tests all scenarios:
- Awaak regular transactions
- Jawaak regular transactions
- Patti Awaak (no lot/weight)
- Patti Jawaak (with lot/weight - mandatory)
- Mixed bills (normal + patti items)
- Payments
- Reverts
- Party rename with historical tracking
- Multilingual (Marathi, Hindi, English) inputs
"""

import pytest
import asyncio
from httpx import AsyncClient, ASGITransport
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
from sqlalchemy import select
from datetime import datetime
import sys
import os

# Add backend to path
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from app.main import app
from app.core.database import Base, get_db
from app.models import Party, MirchiType, Transaction, PattiTransaction, BillNumberSequence
from app.models.transaction import BillType
from app.models.patti_transaction import PattiBillType
from app.models.party import PartyType


# Test database URL (use SQLite for tests)
TEST_DATABASE_URL = "sqlite+aiosqlite:///:memory:"


@pytest.fixture(scope="session")
def event_loop():
    """Create event loop for async tests"""
    loop = asyncio.get_event_loop_policy().new_event_loop()
    yield loop
    loop.close()


@pytest.fixture(scope="function")
async def db_session():
    """Create database session for tests"""
    engine = create_async_engine(TEST_DATABASE_URL, echo=False)
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    
    async_session = async_sessionmaker(engine, expire_on_commit=False)
    
    async with async_session() as session:
        yield session
    
    await engine.dispose()


@pytest.fixture(scope="function")
async def client(db_session):
    """Create test client"""
    async def override_get_db():
        yield db_session
    
    app.dependency_overrides[get_db] = override_get_db
    
    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
        yield ac
    
    app.dependency_overrides.clear()


# ============================================
# PARTY TESTS
# ============================================

class TestParty:
    """Tests for party operations"""
    
    @pytest.mark.asyncio
    async def test_create_party_english(self, client: AsyncClient):
        """Test creating party with English name"""
        response = await client.post("/api/parties", json={
            "name": "Ramesh Kumar",
            "phone": "9876543210",
            "city": "Mumbai",
            "party_type": "awaak",
            "notes": "Regular customer"
        })
        assert response.status_code == 201
        data = response.json()
        assert data["success"] is True
        assert data["data"]["name"] == "Ramesh Kumar"
        assert data["data"]["party_type"] == "awaak"
    
    @pytest.mark.asyncio
    async def test_create_party_marathi(self, client: AsyncClient):
        """Test creating party with Marathi name"""
        response = await client.post("/api/parties", json={
            "name": "रमेश कुमार",
            "phone": "9876543210",
            "city": "मुंबई",
            "party_type": "jawaak",
            "notes": "नियमित ग्राहक"
        })
        assert response.status_code == 201
        data = response.json()
        assert data["data"]["name"] == "रमेश कुमार"
        assert data["data"]["city"] == "मुंबई"
    
    @pytest.mark.asyncio
    async def test_create_party_hindi(self, client: AsyncClient):
        """Test creating party with Hindi name"""
        response = await client.post("/api/parties", json={
            "name": "राम लाल",
            "phone": "9876543211",
            "city": "दिल्ली",
            "party_type": "both",
            "notes": "Hindi customer"
        })
        assert response.status_code == 201
        data = response.json()
        assert data["data"]["name"] == "राम लाल"
    
    @pytest.mark.asyncio
    async def test_rename_party(self, client: AsyncClient):
        """Test renaming party - should track history"""
        # Create party
        create_response = await client.post("/api/parties", json={
            "name": "Old Name",
            "phone": "9876543212",
            "city": "Pune",
            "party_type": "awaak"
        })
        party_id = create_response.json()["data"]["id"]
        
        # Rename party
        rename_response = await client.put(f"/api/parties/{party_id}", json={
            "name": "New Name"
        })
        assert rename_response.status_code == 200
        data = rename_response.json()
        assert data["data"]["name"] == "New Name"
        
        # Check name history
        history_response = await client.get(f"/api/parties/{party_id}/name-history")
        assert history_response.status_code == 200
        history = history_response.json()
        assert history["current_name"] == "New Name"
        assert len(history["name_history"]) == 1
        assert history["name_history"][0]["old_name"] == "Old Name"
        assert history["name_history"][0]["new_name"] == "New Name"


# ============================================
# BILL NUMBER TESTS
# ============================================

class TestBillNumbering:
    """Tests for bill numbering system"""
    
    @pytest.mark.asyncio
    async def test_get_next_bill_number_awaak(self, client: AsyncClient):
        """Test getting next bill number for awaak"""
        response = await client.get("/api/transactions/next-bill-number?bill_type=awaak")
        assert response.status_code == 200
        data = response.json()
        assert data["success"] is True
        # Format: A2025A001
        assert data["bill_number"].startswith("A")
        assert "A" in data["bill_number"]  # Batch A
    
    @pytest.mark.asyncio
    async def test_get_next_bill_number_jawaak(self, client: AsyncClient):
        """Test getting next bill number for jawaak"""
        response = await client.get("/api/transactions/next-bill-number?bill_type=jawaak")
        assert response.status_code == 200
        data = response.json()
        assert data["bill_number"].startswith("J")
    
    @pytest.mark.asyncio
    async def test_get_next_bill_number_patti_awaak(self, client: AsyncClient):
        """Test getting next bill number for patti_awaak"""
        response = await client.get("/api/patti-transactions/next-bill-number?bill_type=patti_awaak")
        assert response.status_code == 200
        data = response.json()
        assert data["bill_number"].startswith("PA")
    
    @pytest.mark.asyncio
    async def test_get_next_bill_number_patti_jawaak(self, client: AsyncClient):
        """Test getting next bill number for patti_jawaak"""
        response = await client.get("/api/patti-transactions/next-bill-number?bill_type=patti_jawaak")
        assert response.status_code == 200
        data = response.json()
        assert data["bill_number"].startswith("PJ")
    
    @pytest.mark.asyncio
    async def test_bill_number_info(self, client: AsyncClient):
        """Test getting bill number sequence info"""
        response = await client.get("/api/transactions/bill-number-info?bill_type=awaak")
        assert response.status_code == 200
        data = response.json()
        assert "bill_type" in data
        assert "year" in data
        assert "prefix" in data
        assert "batches" in data
        assert "total_used" in data
        assert "total_remaining" in data


# ============================================
# TRANSACTION TESTS
# ============================================

class TestTransactions:
    """Tests for regular transactions"""
    
    @pytest.mark.asyncio
    async def test_create_awaak_transaction(self, client: AsyncClient):
        """Test creating awaak (purchase) transaction"""
        # Create party first
        party_response = await client.post("/api/parties", json={
            "name": "Test Party",
            "phone": "9876543213",
            "city": "Nagpur",
            "party_type": "awaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Create transaction
        response = await client.post("/api/transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "awaak",
            "party_id": party_id,
            "subtotal": 10000,
            "total_amount": 10500,
            "paid_amount": 5000,
            "balance_amount": 5500,
            "lot_number": "LOT001",
            "items": [
                {
                    "mirchi_name": "Byadgi",
                    "poti_count": 10,
                    "net_weight": 500,
                    "rate_per_kg": 20,
                    "amount": 10000,
                    "source": "normal"
                }
            ],
            "payments": [
                {
                    "amount": 5000,
                    "mode": "cash",
                    "reference": "Payment 1"
                }
            ]
        })
        assert response.status_code == 201
        data = response.json()
        assert data["success"] is True
        assert data["data"]["bill_type"] == "awaak"
        assert data["data"]["bill_number"].startswith("A")
        assert data["data"]["party_name"] == "Test Party"
        assert data["data"]["party_name_current"] == "Test Party"
    
    @pytest.mark.asyncio
    async def test_create_jawaak_transaction(self, client: AsyncClient):
        """Test creating jawaak (sales) transaction"""
        # Create party first
        party_response = await client.post("/api/parties", json={
            "name": "Sales Party",
            "phone": "9876543214",
            "city": "Solapur",
            "party_type": "jawaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Create transaction
        response = await client.post("/api/transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "jawaak",
            "party_id": party_id,
            "subtotal": 15000,
            "total_amount": 15500,
            "paid_amount": 15500,
            "balance_amount": 0,
            "items": [
                {
                    "mirchi_name": "Sankeshwari",
                    "poti_count": 15,
                    "net_weight": 750,
                    "rate_per_kg": 20,
                    "amount": 15000,
                    "source": "normal"
                }
            ],
            "payments": [
                {
                    "amount": 15500,
                    "mode": "upi",
                    "reference": "UPI123"
                }
            ]
        })
        assert response.status_code == 201
        data = response.json()
        assert data["data"]["bill_type"] == "jawaak"
        assert data["data"]["bill_number"].startswith("J")
    
    @pytest.mark.asyncio
    async def test_create_mixed_bill(self, client: AsyncClient):
        """Test creating mixed bill (normal + patti items)"""
        # Create party
        party_response = await client.post("/api/parties", json={
            "name": "Mixed Party",
            "phone": "9876543215",
            "city": "Kolhapur",
            "party_type": "both"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Create mixed transaction
        response = await client.post("/api/transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "awaak",
            "party_id": party_id,
            "subtotal": 20000,
            "total_amount": 20500,
            "paid_amount": 10000,
            "balance_amount": 10500,
            "items": [
                {
                    "mirchi_name": "Byadgi",
                    "poti_count": 10,
                    "net_weight": 500,
                    "rate_per_kg": 20,
                    "amount": 10000,
                    "source": "normal"
                },
                {
                    "mirchi_name": "Sankeshwari",
                    "poti_count": 10,
                    "net_weight": 500,
                    "rate_per_kg": 20,
                    "amount": 10000,
                    "source": "patti"
                }
            ],
            "payments": [
                {
                    "amount": 10000,
                    "mode": "bank",
                    "reference": "BANK001"
                }
            ]
        })
        assert response.status_code == 201
        data = response.json()
        assert data["data"]["is_mixed"] is True
    
    @pytest.mark.asyncio
    async def test_transaction_with_marathi_names(self, client: AsyncClient):
        """Test transaction with Marathi mirchi names"""
        # Create party with Marathi name
        party_response = await client.post("/api/parties", json={
            "name": "मराठी पक्ष",
            "phone": "9876543216",
            "city": "सांगली",
            "party_type": "awaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Create transaction with Marathi mirchi name
        response = await client.post("/api/transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "awaak",
            "party_id": party_id,
            "subtotal": 12000,
            "total_amount": 12500,
            "paid_amount": 12000,
            "balance_amount": 500,
            "items": [
                {
                    "mirchi_name": "ब्याडगी मिरची",
                    "poti_count": 12,
                    "net_weight": 600,
                    "rate_per_kg": 20,
                    "amount": 12000,
                    "source": "normal"
                }
            ],
            "payments": [
                {
                    "amount": 12000,
                    "mode": "cash"
                }
            ]
        })
        assert response.status_code == 201
        data = response.json()
        assert data["data"]["party_name"] == "मराठी पक्ष"
        assert data["data"]["items"][0]["mirchi_name"] == "ब्याडगी मिरची"


# ============================================
# PATTI TRANSACTION TESTS
# ============================================

class TestPattiTransactions:
    """Tests for patti transactions"""
    
    @pytest.mark.asyncio
    async def test_create_patti_awaak(self, client: AsyncClient):
        """Test creating patti awaak (no lot/weight initially)"""
        # Create party
        party_response = await client.post("/api/parties", json={
            "name": "Patti Holder",
            "phone": "9876543217",
            "city": "Latur",
            "party_type": "awaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Create patti awaak transaction (no lot required)
        response = await client.post("/api/patti-transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "patti_awaak",
            "party_id": party_id,
            "subtotal": 8000,
            "total_amount": 8500,
            "paid_amount": 4000,
            "balance_amount": 4500,
            "expenses": {
                "packing": 100,
                "godown": 200,
                "commission": 100,
                "hamali": 50,
                "gaadi_bhade": 50
            },
            "items": [
                {
                    "mirchi_name": "Local Mirchi",
                    "poti_count": 8,
                    "net_weight": 400,
                    "rate_per_kg": 20,
                    "amount": 8000
                }
            ]
        })
        assert response.status_code == 201
        data = response.json()
        assert data["data"]["bill_type"] == "patti_awaak"
        assert data["data"]["bill_number"].startswith("PA")
        # lot_number is optional for patti_awaak
        assert data["data"].get("lot_number") is None
    
    @pytest.mark.asyncio
    async def test_create_patti_jawaak_with_lot(self, client: AsyncClient):
        """Test creating patti jawaak (lot mandatory)"""
        # Create party
        party_response = await client.post("/api/parties", json={
            "name": "Patti Buyer",
            "phone": "9876543218",
            "city": "Osmanabad",
            "party_type": "jawaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Create patti jawaak transaction (lot required)
        response = await client.post("/api/patti-transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "patti_jawaak",
            "party_id": party_id,
            "subtotal": 12000,
            "total_amount": 12500,
            "paid_amount": 12000,
            "balance_amount": 500,
            "lot_number": "LOT-PJ-001",  # MANDATORY for patti_jawaak
            "gross_weight": 650,
            "verified_net_weight": 600,
            "expenses": {
                "packing": 150,
                "godown": 100,
                "commission": 150,
                "hamali": 50,
                "gaadi_bhade": 50
            },
            "items": [
                {
                    "mirchi_name": "Premium Mirchi",
                    "poti_count": 12,
                    "net_weight": 600,
                    "rate_per_kg": 20,
                    "amount": 12000
                }
            ]
        })
        assert response.status_code == 201
        data = response.json()
        assert data["data"]["bill_type"] == "patti_jawaak"
        assert data["data"]["bill_number"].startswith("PJ")
        assert data["data"]["lot_number"] == "LOT-PJ-001"
        assert data["data"]["gross_weight"] == 650
        assert data["data"]["verified_net_weight"] == 600
    
    @pytest.mark.asyncio
    async def test_patti_jawaak_without_lot_fails(self, client: AsyncClient):
        """Test that patti jawaak without lot_number fails"""
        # Create party
        party_response = await client.post("/api/parties", json={
            "name": "Test Party",
            "phone": "9876543219",
            "city": "Beed",
            "party_type": "jawaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Try to create patti jawaak without lot (should fail)
        response = await client.post("/api/patti-transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "patti_jawaak",
            "party_id": party_id,
            "subtotal": 10000,
            "total_amount": 10500,
            "paid_amount": 10000,
            "balance_amount": 500,
            # lot_number is MISSING - should fail
            "items": [
                {
                    "mirchi_name": "Test Mirchi",
                    "poti_count": 10,
                    "net_weight": 500,
                    "rate_per_kg": 20,
                    "amount": 10000
                }
            ]
        })
        assert response.status_code == 400
        assert "lot number" in response.json()["detail"].lower()


# ============================================
# PAYMENT TESTS
# ============================================

class TestPayments:
    """Tests for payment operations"""
    
    @pytest.mark.asyncio
    async def test_update_payment(self, client: AsyncClient):
        """Test updating payment for transaction"""
        # Create party and transaction
        party_response = await client.post("/api/parties", json={
            "name": "Payment Test Party",
            "phone": "9876543220",
            "city": "Aurangabad",
            "party_type": "awaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        txn_response = await client.post("/api/transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "awaak",
            "party_id": party_id,
            "subtotal": 10000,
            "total_amount": 10000,
            "paid_amount": 5000,
            "balance_amount": 5000,
            "items": [
                {
                    "mirchi_name": "Test",
                    "poti_count": 10,
                    "net_weight": 500,
                    "rate_per_kg": 20,
                    "amount": 10000,
                    "source": "normal"
                }
            ],
            "payments": [
                {"amount": 5000, "mode": "cash"}
            ]
        })
        txn_id = txn_response.json()["data"]["id"]
        
        # Update payment
        response = await client.post(f"/api/transactions/{txn_id}/payment?amount=3000")
        assert response.status_code == 200
        data = response.json()
        assert data["data"]["paid_amount"] == 8000
        assert data["data"]["balance_amount"] == 2000


# ============================================
# REVERT TESTS
# ============================================

class TestReverts:
    """Tests for revert operations"""
    
    @pytest.mark.asyncio
    async def test_revert_transaction(self, client: AsyncClient):
        """Test reverting a transaction"""
        # Create party and transaction
        party_response = await client.post("/api/parties", json={
            "name": "Revert Test Party",
            "phone": "9876543221",
            "city": "Nanded",
            "party_type": "awaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        txn_response = await client.post("/api/transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "awaak",
            "party_id": party_id,
            "subtotal": 5000,
            "total_amount": 5000,
            "paid_amount": 0,
            "balance_amount": 5000,
            "items": [
                {
                    "mirchi_name": "Test",
                    "poti_count": 5,
                    "net_weight": 250,
                    "rate_per_kg": 20,
                    "amount": 5000,
                    "source": "normal"
                }
            ],
            "payments": []
        })
        txn_id = txn_response.json()["data"]["id"]
        
        # Revert transaction
        response = await client.post(f"/api/transactions/{txn_id}/revert")
        assert response.status_code == 200
        data = response.json()
        assert data["success"] is True
    
    @pytest.mark.asyncio
    async def test_revert_patti_transaction(self, client: AsyncClient):
        """Test reverting a patti transaction"""
        # Create party and patti transaction
        party_response = await client.post("/api/parties", json={
            "name": "Patti Revert Test",
            "phone": "9876543222",
            "city": "Parbhani",
            "party_type": "awaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        txn_response = await client.post("/api/patti-transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "patti_awaak",
            "party_id": party_id,
            "subtotal": 6000,
            "total_amount": 6000,
            "paid_amount": 0,
            "balance_amount": 6000,
            "items": [
                {
                    "mirchi_name": "Test",
                    "poti_count": 6,
                    "net_weight": 300,
                    "rate_per_kg": 20,
                    "amount": 6000
                }
            ]
        })
        txn_id = txn_response.json()["data"]["id"]
        
        # Revert patti transaction
        response = await client.post(f"/api/patti-transactions/{txn_id}/revert")
        assert response.status_code == 200


# ============================================
# SEARCH TESTS
# ============================================

class TestSearch:
    """Tests for search functionality"""
    
    @pytest.mark.asyncio
    async def test_search_by_party_name(self, client: AsyncClient):
        """Test searching transactions by party name"""
        # Create party with unique name
        party_response = await client.post("/api/parties", json={
            "name": "Unique Search Party XYZ",
            "phone": "9876543223",
            "city": "Jalna",
            "party_type": "awaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Create transaction
        await client.post("/api/transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "awaak",
            "party_id": party_id,
            "subtotal": 1000,
            "total_amount": 1000,
            "paid_amount": 1000,
            "balance_amount": 0,
            "items": [
                {
                    "mirchi_name": "Test",
                    "poti_count": 1,
                    "net_weight": 50,
                    "rate_per_kg": 20,
                    "amount": 1000,
                    "source": "normal"
                }
            ],
            "payments": [{"amount": 1000, "mode": "cash"}]
        })
        
        # Search by party name
        response = await client.get("/api/transactions?search=Unique Search Party")
        assert response.status_code == 200
        data = response.json()
        assert data["total"] >= 1
    
    @pytest.mark.asyncio
    async def test_search_marathi_text(self, client: AsyncClient):
        """Test searching with Marathi text"""
        # Create party with Marathi name
        party_response = await client.post("/api/parties", json={
            "name": "शोध पक्ष",
            "phone": "9876543224",
            "city": "मुंबई",
            "party_type": "awaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Create transaction
        await client.post("/api/transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "awaak",
            "party_id": party_id,
            "subtotal": 1000,
            "total_amount": 1000,
            "paid_amount": 1000,
            "balance_amount": 0,
            "items": [
                {
                    "mirchi_name": "मिरची",
                    "poti_count": 1,
                    "net_weight": 50,
                    "rate_per_kg": 20,
                    "amount": 1000,
                    "source": "normal"
                }
            ],
            "payments": [{"amount": 1000, "mode": "cash"}]
        })
        
        # Search with Marathi text
        response = await client.get("/api/transactions?search=शोध")
        assert response.status_code == 200


# ============================================
# PARTY RENAME IMPACT TESTS
# ============================================

class TestPartyRenameImpact:
    """Tests for party rename impact on transactions"""
    
    @pytest.mark.asyncio
    async def test_rename_updates_transaction_search(self, client: AsyncClient):
        """Test that renaming party updates party_name_current in transactions"""
        # Create party
        party_response = await client.post("/api/parties", json={
            "name": "Original Name",
            "phone": "9876543225",
            "city": "Pune",
            "party_type": "awaak"
        })
        party_id = party_response.json()["data"]["id"]
        
        # Create transaction
        txn_response = await client.post("/api/transactions", json={
            "bill_date": datetime.now().strftime("%Y-%m-%d"),
            "bill_type": "awaak",
            "party_id": party_id,
            "subtotal": 1000,
            "total_amount": 1000,
            "paid_amount": 1000,
            "balance_amount": 0,
            "items": [
                {
                    "mirchi_name": "Test",
                    "poti_count": 1,
                    "net_weight": 50,
                    "rate_per_kg": 20,
                    "amount": 1000,
                    "source": "normal"
                }
            ],
            "payments": [{"amount": 1000, "mode": "cash"}]
        })
        txn_id = txn_response.json()["data"]["id"]
        
        # Rename party
        await client.put(f"/api/parties/{party_id}", json={"name": "Renamed Party"})
        
        # Get transaction - should have updated party_name_current
        response = await client.get(f"/api/transactions/{txn_id}")
        assert response.status_code == 200
        data = response.json()
        # Original name snapshot should remain
        assert data["data"]["party_name"] == "Original Name"
        # Current name should be updated for search
        assert data["data"]["party_name_current"] == "Renamed Party"
        
        # Search by new name should find the transaction
        search_response = await client.get("/api/transactions?search=Renamed Party")
        assert search_response.status_code == 200
        assert search_response.json()["total"] >= 1


if __name__ == "__main__":
    pytest.main([__file__, "-v", "--tb=short"])