"""
Integration Tests für Workflow Branching (Phase 3)

Testet conditional execution mit Logic Nodes.

Run with: PYTHONPATH=./backend pytest tests/backend/test_phase3_workflow_branching.py -v
"""
import pytest
from unittest.mock import AsyncMock, MagicMock, patch
from workflow_executor import execute_workflow
from workflow_models import (
    WorkflowGraph, WorkflowNode, WorkflowEdge,
    LogicExpression, LogicOperator, Condition, FallbackConfig, FallbackStrategy,
    QuestionAugmentation, NodeStatus
)


# ── Helper Functions ────────────────────────────────────────────────────────


def create_mock_db():
    """Creates mock DB connection with cursor"""
    conn = MagicMock()
    cur = MagicMock()
    cur.fetchone = MagicMock()
    cur.fetchall = MagicMock(return_value=[])

    # Mock get_cursor()
    def mock_get_cursor(c):
        return cur

    # Context manager support
    conn.__enter__ = MagicMock(return_value=conn)
    conn.__exit__ = MagicMock(return_value=None)

    return conn, cur, mock_get_cursor


@pytest.mark.asyncio
async def test_simple_if_else_branching():
    """Test: Simple if/else branching - then path taken"""

    # Workflow: start → analysis → logic → then_path / else_path → end
    workflow_graph = {
        "nodes": [
            {"id": "start", "type": "start"},
            {"id": "analysis", "type": "analysis", "prompt_slug": "test_prompt",
             "question_augmentations": [
                 {"id": "q1", "type": "relevanz", "question": "Relevant?", "answer_spectrum": ["ja", "nein"]}
             ]},
            {"id": "logic", "type": "logic",
             "condition": {
                 "expression": {
                     "operator": "eq",
                     "ref": "analysis.relevanz",
                     "value": "ja"
                 }
             }},
            {"id": "then_path", "type": "analysis", "prompt_slug": "then_prompt"},
            {"id": "else_path", "type": "analysis", "prompt_slug": "else_prompt"},
            {"id": "end", "type": "end"}
        ],
        "edges": [
            {"id": "e1", "from": "start", "to": "analysis"},
            {"id": "e2", "from": "analysis", "to": "logic"},
            {"id": "e3", "from": "logic", "to": "then_path", "label": "then"},
            {"id": "e4", "from": "logic", "to": "else_path", "label": "else"},
            {"id": "e5", "from": "then_path", "to": "end"},
            {"id": "e6", "from": "else_path", "to": "end"}
        ]
    }

    # Mock DB
    conn, cur, mock_get_cursor = create_mock_db()
    cur.fetchone.side_effect = [
        {"graph": workflow_graph},  # Workflow definition
        {"template": "Test prompt"}  # Prompt template
    ]
    cur.fetchall.return_value = [
        {"question_type": "relevanz", "answer_spectrum": ["ja", "nein"], "normalization_rules": None}
    ]

    # Mock LLM - returns "ja" signal
    async def mock_llm(prompt, model):
        return """## Analyse
Test analysis

## Entscheidungsfragen
- Relevanz: ja
"""

    with patch('workflow_executor.get_db', return_value=conn):
        with patch('workflow_executor.get_cursor', side_effect=mock_get_cursor):
            with patch('placeholder_resolver.resolve_placeholders', return_value="Test prompt"):
                result = await execute_workflow(
                    workflow_id="test-workflow",
                    profile_id="test-profile",
                    variables={},
                    openrouter_call_func=mock_llm
                )

    # Assertions
    assert result.status == "completed"
    assert len(result.node_states) == 5  # start, analysis, logic, then_path, end (else_path skipped)

    # Check which nodes were executed
    executed_nodes = [s.node_id for s in result.node_states if s.status == NodeStatus.EXECUTED]
    skipped_nodes = [s.node_id for s in result.node_states if s.status == NodeStatus.SKIPPED]

    assert "then_path" in executed_nodes
    assert "else_path" in skipped_nodes

    # Check aggregation
    assert result.aggregated_result["executed_nodes"] == 4  # start, analysis, logic, then_path (end is no-op)
    assert result.aggregated_result["skipped_nodes"] == 1  # else_path


@pytest.mark.asyncio
async def test_else_path_taken():
    """Test: Simple if/else branching - else path taken"""

    workflow_graph = {
        "nodes": [
            {"id": "start", "type": "start"},
            {"id": "analysis", "type": "analysis", "prompt_slug": "test_prompt",
             "question_augmentations": [
                 {"id": "q1", "type": "relevanz", "question": "Relevant?", "answer_spectrum": ["ja", "nein"]}
             ]},
            {"id": "logic", "type": "logic",
             "condition": {
                 "expression": {
                     "operator": "eq",
                     "ref": "analysis.relevanz",
                     "value": "ja"
                 }
             }},
            {"id": "then_path", "type": "analysis", "prompt_slug": "then_prompt"},
            {"id": "else_path", "type": "analysis", "prompt_slug": "else_prompt"},
            {"id": "end", "type": "end"}
        ],
        "edges": [
            {"id": "e1", "from": "start", "to": "analysis"},
            {"id": "e2", "from": "analysis", "to": "logic"},
            {"id": "e3", "from": "logic", "to": "then_path", "label": "then"},
            {"id": "e4", "from": "logic", "to": "else_path", "label": "else"},
            {"id": "e5", "from": "then_path", "to": "end"},
            {"id": "e6", "from": "else_path", "to": "end"}
        ]
    }

    conn, cur = create_mock_db()
    cur.fetchone.side_effect = [
        {"graph": workflow_graph},
        {"template": "Test prompt"}
    ]
    cur.fetchall.return_value = [
        {"question_type": "relevanz", "answer_spectrum": ["ja", "nein"], "normalization_rules": None}
    ]

    # Mock LLM - returns "nein" signal (condition false)
    async def mock_llm(prompt, model):
        return """## Analyse
Test analysis

## Entscheidungsfragen
- Relevanz: nein
"""

    with patch('workflow_executor.get_db', return_value=conn):
        with patch('placeholder_resolver.resolve_placeholders', return_value="Test prompt"):
            result = await execute_workflow(
                workflow_id="test-workflow",
                profile_id="test-profile",
                variables={},
                openrouter_call_func=mock_llm
            )

    # Assertions
    executed_nodes = [s.node_id for s in result.node_states if s.status == NodeStatus.EXECUTED]
    skipped_nodes = [s.node_id for s in result.node_states if s.status == NodeStatus.SKIPPED]

    assert "else_path" in executed_nodes
    assert "then_path" in skipped_nodes


@pytest.mark.asyncio
async def test_and_condition():
    """Test: AND condition - both must be true"""

    workflow_graph = {
        "nodes": [
            {"id": "start", "type": "start"},
            {"id": "analysis1", "type": "analysis", "prompt_slug": "test_prompt",
             "question_augmentations": [
                 {"id": "q1", "type": "relevanz", "question": "Relevant?", "answer_spectrum": ["ja", "nein"]}
             ]},
            {"id": "analysis2", "type": "analysis", "prompt_slug": "test_prompt",
             "question_augmentations": [
                 {"id": "q2", "type": "prioritaet", "question": "Priority?", "answer_spectrum": ["hoch", "niedrig"]}
             ]},
            {"id": "logic", "type": "logic",
             "condition": {
                 "expression": {
                     "operator": "and",
                     "operands": [
                         {"operator": "eq", "ref": "analysis1.relevanz", "value": "ja"},
                         {"operator": "eq", "ref": "analysis2.prioritaet", "value": "hoch"}
                     ]
                 }
             }},
            {"id": "then_path", "type": "analysis", "prompt_slug": "then_prompt"},
            {"id": "else_path", "type": "analysis", "prompt_slug": "else_prompt"},
            {"id": "end", "type": "end"}
        ],
        "edges": [
            {"id": "e1", "from": "start", "to": "analysis1"},
            {"id": "e2", "from": "analysis1", "to": "analysis2"},
            {"id": "e3", "from": "analysis2", "to": "logic"},
            {"id": "e4", "from": "logic", "to": "then_path", "label": "then"},
            {"id": "e5", "from": "logic", "to": "else_path", "label": "else"},
            {"id": "e6", "from": "then_path", "to": "end"},
            {"id": "e7", "from": "else_path", "to": "end"}
        ]
    }

    conn, cur = create_mock_db()
    cur.fetchone.side_effect = [
        {"graph": workflow_graph},
        {"template": "Test prompt"},
        {"template": "Test prompt"}
    ]
    cur.fetchall.return_value = [
        {"question_type": "relevanz", "answer_spectrum": ["ja", "nein"], "normalization_rules": None},
        {"question_type": "prioritaet", "answer_spectrum": ["hoch", "niedrig"], "normalization_rules": None}
    ]

    # Mock LLM - returns ja AND hoch (both true)
    call_count = 0
    async def mock_llm(prompt, model):
        nonlocal call_count
        call_count += 1
        if call_count == 1:
            return """## Analyse
Analysis 1

## Entscheidungsfragen
- Relevanz: ja
"""
        else:
            return """## Analyse
Analysis 2

## Entscheidungsfragen
- Prioritaet: hoch
"""

    with patch('workflow_executor.get_db', return_value=conn):
        with patch('placeholder_resolver.resolve_placeholders', return_value="Test prompt"):
            result = await execute_workflow(
                workflow_id="test-workflow",
                profile_id="test-profile",
                variables={},
                openrouter_call_func=mock_llm
            )

    # Assertions: Both true → then path taken
    executed_nodes = [s.node_id for s in result.node_states if s.status == NodeStatus.EXECUTED]
    skipped_nodes = [s.node_id for s in result.node_states if s.status == NodeStatus.SKIPPED]

    assert "then_path" in executed_nodes
    assert "else_path" in skipped_nodes


@pytest.mark.asyncio
async def test_fallback_conservative_skip():
    """Test: Fallback strategy CONSERVATIVE_SKIP"""

    workflow_graph = {
        "nodes": [
            {"id": "start", "type": "start"},
            {"id": "analysis", "type": "analysis", "prompt_slug": "test_prompt",
             "question_augmentations": [
                 {"id": "q1", "type": "relevanz", "question": "Relevant?", "answer_spectrum": ["ja", "nein"]}
             ]},
            {"id": "logic", "type": "logic",
             "condition": {
                 "expression": {
                     "operator": "eq",
                     "ref": "analysis.relevanz",
                     "value": "ja"
                 }
             },
             "fallback": {
                 "strategy": "conservative_skip"
             }},
            {"id": "then_path", "type": "analysis", "prompt_slug": "then_prompt"},
            {"id": "else_path", "type": "analysis", "prompt_slug": "else_prompt"},
            {"id": "end", "type": "end"}
        ],
        "edges": [
            {"id": "e1", "from": "start", "to": "analysis"},
            {"id": "e2", "from": "analysis", "to": "logic"},
            {"id": "e3", "from": "logic", "to": "then_path", "label": "then"},
            {"id": "e4", "from": "logic", "to": "else_path", "label": "else"},
            {"id": "e5", "from": "then_path", "to": "end"},
            {"id": "e6", "from": "else_path", "to": "end"}
        ]
    }

    conn, cur = create_mock_db()
    cur.fetchone.side_effect = [
        {"graph": workflow_graph},
        {"template": "Test prompt"}
    ]
    cur.fetchall.return_value = [
        {"question_type": "relevanz", "answer_spectrum": ["ja", "nein"], "normalization_rules": None}
    ]

    # Mock LLM - returns UNCLEAR signal (triggers fallback)
    async def mock_llm(prompt, model):
        return """## Analyse
Test analysis

## Entscheidungsfragen
- Relevanz: unklar
"""

    with patch('workflow_executor.get_db', return_value=conn):
        with patch('placeholder_resolver.resolve_placeholders', return_value="Test prompt"):
            result = await execute_workflow(
                workflow_id="test-workflow",
                profile_id="test-profile",
                variables={},
                openrouter_call_func=mock_llm
            )

    # Assertions: CONSERVATIVE_SKIP → both paths skipped
    skipped_nodes = [s.node_id for s in result.node_states if s.status == NodeStatus.SKIPPED]

    assert "then_path" in skipped_nodes
    assert "else_path" in skipped_nodes
    assert result.aggregated_result["skipped_nodes"] == 2


@pytest.mark.asyncio
async def test_fallback_default_path():
    """Test: Fallback strategy DEFAULT_PATH"""

    workflow_graph = {
        "nodes": [
            {"id": "start", "type": "start"},
            {"id": "analysis", "type": "analysis", "prompt_slug": "test_prompt",
             "question_augmentations": [
                 {"id": "q1", "type": "relevanz", "question": "Relevant?", "answer_spectrum": ["ja", "nein"]}
             ]},
            {"id": "logic", "type": "logic",
             "condition": {
                 "expression": {
                     "operator": "eq",
                     "ref": "analysis.relevanz",
                     "value": "ja"
                 }
             },
             "fallback": {
                 "strategy": "default_path"
             }},
            {"id": "then_path", "type": "analysis", "prompt_slug": "then_prompt"},
            {"id": "else_path", "type": "analysis", "prompt_slug": "else_prompt"},
            {"id": "end", "type": "end"}
        ],
        "edges": [
            {"id": "e1", "from": "start", "to": "analysis"},
            {"id": "e2", "from": "analysis", "to": "logic"},
            {"id": "e3", "from": "logic", "to": "then_path", "label": "then"},
            {"id": "e4", "from": "logic", "to": "else_path", "label": "else"},
            {"id": "e5", "from": "then_path", "to": "end"},
            {"id": "e6", "from": "else_path", "to": "end"}
        ]
    }

    conn, cur = create_mock_db()
    cur.fetchone.side_effect = [
        {"graph": workflow_graph},
        {"template": "Test prompt"}
    ]
    cur.fetchall.return_value = [
        {"question_type": "relevanz", "answer_spectrum": ["ja", "nein"], "normalization_rules": None}
    ]

    # Mock LLM - returns INVALID signal (triggers fallback)
    async def mock_llm(prompt, model):
        return """## Analyse
Test analysis

## Entscheidungsfragen
- Relevanz: totally_invalid_value
"""

    with patch('workflow_executor.get_db', return_value=conn):
        with patch('placeholder_resolver.resolve_placeholders', return_value="Test prompt"):
            result = await execute_workflow(
                workflow_id="test-workflow",
                profile_id="test-profile",
                variables={},
                openrouter_call_func=mock_llm
            )

    # Assertions: DEFAULT_PATH → else path taken
    executed_nodes = [s.node_id for s in result.node_states if s.status == NodeStatus.EXECUTED]
    skipped_nodes = [s.node_id for s in result.node_states if s.status == NodeStatus.SKIPPED]

    assert "else_path" in executed_nodes
    assert "then_path" in skipped_nodes


@pytest.mark.asyncio
async def test_linear_workflow_still_works():
    """Test: Linear workflow (no logic nodes) still works (Phase 2 compatibility)"""

    workflow_graph = {
        "nodes": [
            {"id": "start", "type": "start"},
            {"id": "analysis", "type": "analysis", "prompt_slug": "test_prompt"},
            {"id": "end", "type": "end"}
        ],
        "edges": [
            {"id": "e1", "from": "start", "to": "analysis"},
            {"id": "e2", "from": "analysis", "to": "end"}
        ]
    }

    conn, cur = create_mock_db()
    cur.fetchone.side_effect = [
        {"graph": workflow_graph},
        {"template": "Test prompt"}
    ]
    cur.fetchall.return_value = []

    async def mock_llm(prompt, model):
        return "## Analyse\nTest analysis"

    with patch('workflow_executor.get_db', return_value=conn):
        with patch('placeholder_resolver.resolve_placeholders', return_value="Test prompt"):
            result = await execute_workflow(
                workflow_id="test-workflow",
                profile_id="test-profile",
                variables={},
                openrouter_call_func=mock_llm
            )

    # Assertions: All nodes executed
    assert result.status == "completed"
    assert len(result.node_states) == 3
    assert all(s.status == NodeStatus.EXECUTED for s in result.node_states)
    assert result.aggregated_result["skipped_nodes"] == 0


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