"""
Integration tests for External API.
Tests the complete flow: project init → config → dispatch → annotate → export.
"""
import pytest
from fastapi.testclient import TestClient
from datetime import datetime
import json
import os
import sys

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

from main import app
from database import get_db_connection


@pytest.fixture(scope="module")
def client():
    """Create test client."""
    return TestClient(app)


@pytest.fixture(scope="module")
def admin_token(client):
    """Get admin authentication token."""
    # Try to login as admin
    response = client.post("/api/auth/login", json={
        "username": "admin",
        "password": "admin123"
    })
    
    if response.status_code == 200:
        return response.json()["access_token"]
    
    # If admin doesn't exist, create one
    response = client.post("/api/auth/register", json={
        "username": "admin",
        "email": "admin@test.com",
        "password": "admin123",
        "role": "admin"
    })
    
    if response.status_code in [200, 201]:
        return response.json()["access_token"]
    
    # Try login again
    response = client.post("/api/auth/login", json={
        "username": "admin",
        "password": "admin123"
    })
    return response.json()["access_token"]


@pytest.fixture(scope="module")
def annotator_token(client):
    """Get annotator authentication token."""
    # Try to login as annotator
    response = client.post("/api/auth/login", json={
        "username": "annotator1",
        "password": "annotator123"
    })
    
    if response.status_code == 200:
        return response.json()["access_token"]
    
    # If annotator doesn't exist, create one
    response = client.post("/api/auth/register", json={
        "username": "annotator1",
        "email": "annotator1@test.com",
        "password": "annotator123",
        "role": "annotator"
    })
    
    if response.status_code in [200, 201]:
        return response.json()["access_token"]
    
    # Try login again
    response = client.post("/api/auth/login", json={
        "username": "annotator1",
        "password": "annotator123"
    })
    return response.json()["access_token"]


class TestExternalAPIAuthentication:
    """Test external API authentication."""
    
    def test_init_project_without_token(self, client):
        """Test that init project requires authentication."""
        response = client.post("/api/external/projects/init", json={
            "name": "Test Project",
            "task_type": "image_classification",
            "data": [{"content": "http://example.com/1.jpg"}]
        })
        assert response.status_code == 401
    
    def test_init_project_with_invalid_token(self, client):
        """Test that init project rejects invalid token."""
        response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Test Project",
                "task_type": "image_classification",
                "data": [{"content": "http://example.com/1.jpg"}]
            },
            headers={"Authorization": "Bearer invalid_token"}
        )
        assert response.status_code == 401
    
    def test_init_project_with_annotator_token(self, client, annotator_token):
        """Test that init project requires admin role."""
        response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Test Project",
                "task_type": "image_classification",
                "data": [{"content": "http://example.com/1.jpg"}]
            },
            headers={"Authorization": f"Bearer {annotator_token}"}
        )
        assert response.status_code == 403


class TestExternalAPIProjectInit:
    """Test external API project initialization."""
    
    def test_init_project_success(self, client, admin_token):
        """Test successful project initialization."""
        response = client.post(
            "/api/external/projects/init",
            json={
                "name": "External Test Project",
                "task_type": "image_classification",
                "data": [
                    {"content": "http://example.com/1.jpg"},
                    {"content": "http://example.com/2.jpg"},
                    {"content": "http://example.com/3.jpg"}
                ],
                "external_id": "ext_123"
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 201
        data = response.json()
        assert "project_id" in data
        assert data["task_count"] == 3
        assert data["status"] == "draft"
    
    def test_init_project_with_description(self, client, admin_token):
        """Test project initialization with description."""
        response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Project with Description",
                "description": "This is a test project",
                "task_type": "text_classification",
                "data": [
                    {"content": "Sample text 1"},
                    {"content": "Sample text 2"}
                ]
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 201
        data = response.json()
        assert data["task_count"] == 2
    
    def test_init_project_empty_data(self, client, admin_token):
        """Test project initialization with empty data items."""
        response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Empty Project",
                "task_type": "image_classification",
                "data": []
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        # Should fail validation (min_length=1)
        assert response.status_code == 422


class TestExternalAPIProgress:
    """Test external API progress query."""
    
    def test_get_progress_success(self, client, admin_token):
        """Test successful progress query."""
        # First create a project
        init_response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Progress Test Project",
                "task_type": "image_classification",
                "data": [
                    {"content": "http://example.com/1.jpg"},
                    {"content": "http://example.com/2.jpg"}
                ]
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert init_response.status_code == 201
        project_id = init_response.json()["project_id"]
        
        # Get progress
        response = client.get(
            f"/api/external/projects/{project_id}/progress",
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 200
        data = response.json()
        assert data["project_id"] == project_id
        assert data["total_tasks"] == 2
        assert data["completed_tasks"] == 0
        assert data["completion_percentage"] == 0.0
    
    def test_get_progress_not_found(self, client, admin_token):
        """Test progress query for non-existent project."""
        response = client.get(
            "/api/external/projects/nonexistent_id/progress",
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 404


class TestExternalAPIExport:
    """Test external API data export."""
    
    def test_export_json_format(self, client, admin_token):
        """Test JSON format export."""
        # First create a project
        init_response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Export Test Project",
                "task_type": "image_classification",
                "data": [
                    {"content": "http://example.com/1.jpg"}
                ]
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert init_response.status_code == 201
        project_id = init_response.json()["project_id"]
        
        # Export data
        response = client.post(
            f"/api/external/projects/{project_id}/export",
            json={
                "format": "json",
                "completed_only": False
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 200
        data = response.json()
        assert "file_url" in data
    
    def test_export_invalid_format(self, client, admin_token):
        """Test export with invalid format."""
        # First create a project
        init_response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Invalid Export Test",
                "task_type": "image_classification",
                "data": [{"content": "http://example.com/1.jpg"}]
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert init_response.status_code == 201
        project_id = init_response.json()["project_id"]
        
        # Try invalid format
        response = client.post(
            f"/api/external/projects/{project_id}/export",
            json={
                "format": "invalid_format",
                "completed_only": False
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 422  # Validation error


class TestProjectStatusTransitions:
    """Test project status transitions."""
    
    def test_valid_status_transition(self, client, admin_token):
        """Test valid status transition: draft → configuring."""
        # Create project
        init_response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Status Test Project",
                "task_type": "image_classification",
                "data": [{"content": "http://example.com/1.jpg"}]
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        project_id = init_response.json()["project_id"]
        
        # Update status to configuring
        response = client.put(
            f"/api/projects/{project_id}/status",
            json={"status": "configuring"},
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 200
        assert response.json()["status"] == "configuring"
    
    def test_invalid_status_transition(self, client, admin_token):
        """Test invalid status transition: draft → completed."""
        # Create project
        init_response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Invalid Status Test",
                "task_type": "image_classification",
                "data": [{"content": "http://example.com/1.jpg"}]
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        project_id = init_response.json()["project_id"]
        
        # Try invalid transition
        response = client.put(
            f"/api/projects/{project_id}/status",
            json={"status": "completed"},
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 400


class TestProjectConfig:
    """Test project configuration."""
    
    def test_update_config_success(self, client, admin_token):
        """Test successful config update."""
        # Create project
        init_response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Config Test Project",
                "task_type": "image_classification",
                "data": [{"content": "http://example.com/1.jpg"}]
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        project_id = init_response.json()["project_id"]
        
        # Update config
        new_config = """<View>
  <Image name="image" value="$image"/>
  <Choices name="choice" toName="image">
    <Choice value="Cat"/>
    <Choice value="Dog"/>
  </Choices>
</View>"""
        
        response = client.put(
            f"/api/projects/{project_id}/config",
            json={"config": new_config},
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 200
        assert response.json()["status"] == "configuring"
    
    def test_update_config_invalid_xml(self, client, admin_token):
        """Test config update with invalid XML."""
        # Create project
        init_response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Invalid Config Test",
                "task_type": "image_classification",
                "data": [{"content": "http://example.com/1.jpg"}]
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        project_id = init_response.json()["project_id"]
        
        # Try invalid config
        response = client.put(
            f"/api/projects/{project_id}/config",
            json={"config": "not xml at all"},
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        assert response.status_code == 400


class TestTaskDispatch:
    """Test task dispatch functionality."""
    
    def test_preview_assignment(self, client, admin_token, annotator_token):
        """Test assignment preview."""
        # Create project and set to ready
        init_response = client.post(
            "/api/external/projects/init",
            json={
                "name": "Dispatch Test Project",
                "task_type": "image_classification",
                "data": [
                    {"content": "http://example.com/1.jpg"},
                    {"content": "http://example.com/2.jpg"},
                    {"content": "http://example.com/3.jpg"},
                    {"content": "http://example.com/4.jpg"}
                ]
            },
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        project_id = init_response.json()["project_id"]
        
        # Update config
        config = """<View>
  <Image name="image" value="$image"/>
  <Choices name="choice" toName="image">
    <Choice value="Cat"/>
  </Choices>
</View>"""
        
        client.put(
            f"/api/projects/{project_id}/config",
            json={"config": config},
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        # Set to ready
        client.put(
            f"/api/projects/{project_id}/status",
            json={"status": "ready"},
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        # Get annotator list
        annotators_response = client.get(
            "/api/users/annotators",
            headers={"Authorization": f"Bearer {admin_token}"}
        )
        
        if annotators_response.status_code == 200 and len(annotators_response.json()) > 0:
            annotator_ids = [a["id"] for a in annotators_response.json()[:2]]
            
            # Preview assignment
            response = client.post(
                f"/api/tasks/preview-assignment/{project_id}",
                json={"user_ids": annotator_ids},
                headers={"Authorization": f"Bearer {admin_token}"}
            )
            
            assert response.status_code == 200
            data = response.json()
            assert data["unassigned_tasks"] == 4
            assert len(data["assignments"]) == len(annotator_ids)


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