"""
Workflow Execution Router (Phase 2)

Endpunkte für Workflow-Execution und Ergebnis-Abruf.

Phase 2: Sequenzielle Execution
Phase 3: Conditional branching
"""
from fastapi import APIRouter, Depends, HTTPException
from auth import require_auth
from db import get_db, get_cursor, r2d
from pydantic import BaseModel
from typing import Dict, Any, Optional
import logging

logger = logging.getLogger(__name__)

router = APIRouter()


class WorkflowExecuteRequest(BaseModel):
    """Request-Body für Workflow-Execution"""
    variables: Dict[str, Any] = {}
    enable_debug: bool = False


@router.post("/api/workflows/{workflow_id}/execute")
async def execute_workflow_endpoint(
    workflow_id: str,
    request: WorkflowExecuteRequest,
    session: dict = Depends(require_auth)
):
    """
    Führt einen Workflow aus.

    Args:
        workflow_id: UUID des Workflows (aus workflow_definitions)
        request.variables: Platzhalter-Werte (optional, z.B. {"name": "Lars"})
        request.enable_debug: Debug-Modus (zeigt node_states im Response)

    Returns:
        {
            "execution_id": "...",
            "status": "completed" | "failed",
            "aggregated_result": {
                "combined_analysis": "...",
                "all_signals": [...],
                "total_nodes": 3,
                "executed_nodes": 3,
                "failed_nodes": 0
            },
            "node_states": [...],  # Nur wenn enable_debug=true
            "error": "..."         # Nur wenn failed
        }

    Beispiel:
        POST /api/workflows/abc123/execute
        {
            "variables": {"name": "Lars"},
            "enable_debug": true
        }
    """
    from prompt_executor import execute_workflow_prompt
    from routers.prompts import call_openrouter

    profile_id = session["profile_id"]

    # Add profile_id to variables (für placeholder_resolver)
    variables = {**request.variables, "profile_id": profile_id}

    # Load workflow as "prompt" (für execute_workflow_prompt)
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute(
            "SELECT id, name, slug FROM workflow_definitions WHERE id = %s AND active = true",
            (workflow_id,)
        )
        row = cur.fetchone()
        if not row:
            raise HTTPException(404, f"Workflow nicht gefunden: {workflow_id}")

        workflow_prompt = {
            "id": row['id'],
            "name": row['name'],
            "slug": row['slug'],
            "type": "workflow"
        }

    try:
        result = await execute_workflow_prompt(
            prompt=workflow_prompt,
            variables=variables,
            openrouter_call_func=call_openrouter,
            enable_debug=request.enable_debug
        )
        return result

    except Exception as e:
        logger.error(f"Workflow execution failed: {e}", exc_info=True)
        raise HTTPException(500, f"Workflow-Ausführung fehlgeschlagen: {str(e)}")


@router.get("/api/workflows/executions/{execution_id}")
def get_execution_result(
    execution_id: str,
    session: dict = Depends(require_auth)
):
    """
    Lädt gespeicherten Execution State aus DB.

    Args:
        execution_id: UUID der Execution (aus workflow_executions)

    Returns:
        {
            "id": "...",
            "workflow_id": "...",
            "profile_id": "...",
            "status": "completed" | "failed",
            "node_states": [...],  # JSONB
            "execution_log": {...},
            "started_at": "2026-04-03T12:00:00",
            "completed_at": "2026-04-03T12:00:10"
        }

    Beispiel:
        GET /api/workflows/executions/abc123
    """
    profile_id = session["profile_id"]

    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("""
            SELECT id, workflow_id, profile_id, status, node_states, execution_log,
                   started_at::text, completed_at::text
            FROM workflow_executions
            WHERE id = %s AND profile_id = %s
        """, (execution_id, profile_id))
        row = cur.fetchone()

    if not row:
        raise HTTPException(404, "Execution nicht gefunden")

    return r2d(row)


@router.get("/api/workflows")
def list_workflows(
    session: dict = Depends(require_auth)
):
    """
    Listet alle aktiven Workflows auf.

    Returns:
        [
            {
                "id": "...",
                "name": "...",
                "slug": "...",
                "description": "...",
                "version": 1,
                "created_at": "...",
                "updated_at": "..."
            },
            ...
        ]

    Beispiel:
        GET /api/workflows
    """
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("""
            SELECT id, name, slug, description, version,
                   created_at::text, updated_at::text
            FROM workflow_definitions
            WHERE active = true
            ORDER BY name
        """)
        rows = cur.fetchall()

    return [r2d(row) for row in rows]


@router.get("/api/workflows/{workflow_id}")
def get_workflow(
    workflow_id: str,
    session: dict = Depends(require_auth)
):
    """
    Lädt einen einzelnen Workflow mit Graph.

    Args:
        workflow_id: UUID des Workflows

    Returns:
        {
            "id": "...",
            "name": "...",
            "slug": "...",
            "description": "...",
            "graph": {...},  # JSONB
            "version": 1,
            "active": true,
            "created_at": "...",
            "updated_at": "..."
        }
    """
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("""
            SELECT id, name, slug, description, graph, version, active,
                   created_at::text, updated_at::text
            FROM workflow_definitions
            WHERE id = %s AND active = true
        """, (workflow_id,))
        row = cur.fetchone()

    if not row:
        raise HTTPException(404, "Workflow nicht gefunden")

    return r2d(row)