"""
Recipe management routes for L1 server.

Handles recipe upload, listing, viewing, and execution.
"""

import logging
from typing import List, Optional

from fastapi import APIRouter, Request, Depends, HTTPException, UploadFile, File
from fastapi.responses import HTMLResponse
from pydantic import BaseModel

from artdag_common import render
from artdag_common.middleware import wants_html, wants_json
from artdag_common.middleware.auth import UserContext

from ..dependencies import require_auth, get_templates, get_redis_client, get_cache_manager
from ..services.auth_service import AuthService
from ..services.recipe_service import RecipeService

router = APIRouter()
logger = logging.getLogger(__name__)


class RecipeUploadRequest(BaseModel):
    yaml_content: str
    name: Optional[str] = None
    description: Optional[str] = None


class RecipeRunRequest(BaseModel):
    inputs: dict = {}


def get_recipe_service():
    """Get recipe service instance."""
    return RecipeService(get_redis_client(), get_cache_manager())


@router.post("/upload")
async def upload_recipe(
    file: UploadFile = File(...),
    ctx: UserContext = Depends(require_auth),
    recipe_service: RecipeService = Depends(get_recipe_service),
):
    """Upload a new recipe from YAML file."""
    import yaml

    # Read the YAML content from the uploaded file
    yaml_content = (await file.read()).decode("utf-8")

    # Parse YAML to extract recipe info for response
    try:
        recipe_data = yaml.safe_load(yaml_content)
    except yaml.YAMLError as e:
        raise HTTPException(400, f"Invalid YAML: {e}")

    # Use filename (without extension) as recipe name if not in YAML
    recipe_name = recipe_data.get("name")
    if not recipe_name and file.filename:
        recipe_name = file.filename.rsplit(".", 1)[0]

    recipe_id, error = await recipe_service.upload_recipe(
        yaml_content=yaml_content,
        uploader=ctx.actor_id,
        name=recipe_name,
        description=recipe_data.get("description"),
    )

    if error:
        raise HTTPException(400, error)

    # Extract input info for response
    inputs = recipe_data.get("inputs", {})
    variable_inputs = []
    fixed_inputs = []
    for input_name, input_def in inputs.items():
        if isinstance(input_def, dict) and input_def.get("fixed"):
            fixed_inputs.append(input_name)
        else:
            variable_inputs.append(input_name)

    return {
        "recipe_id": recipe_id,
        "name": recipe_name or "unnamed",
        "version": recipe_data.get("version", "1.0"),
        "variable_inputs": variable_inputs,
        "fixed_inputs": fixed_inputs,
        "message": "Recipe uploaded successfully",
    }


@router.get("")
async def list_recipes(
    request: Request,
    offset: int = 0,
    limit: int = 20,
    recipe_service: RecipeService = Depends(get_recipe_service),
):
    """List available recipes."""
    auth_service = AuthService(get_redis_client())
    ctx = auth_service.get_user_from_cookie(request)

    if not ctx:
        if wants_json(request):
            raise HTTPException(401, "Authentication required")
        from fastapi.responses import RedirectResponse
        return RedirectResponse(url="/auth", status_code=302)

    recipes = await recipe_service.list_recipes(ctx.actor_id, offset=offset, limit=limit)

    if wants_json(request):
        return {"recipes": recipes, "offset": offset, "limit": limit}

    templates = get_templates(request)
    return render(templates, "recipes/list.html", request,
        recipes=recipes,
        user=ctx,
        active_tab="recipes",
    )


@router.get("/{recipe_id}")
async def get_recipe(
    recipe_id: str,
    request: Request,
    recipe_service: RecipeService = Depends(get_recipe_service),
):
    """Get recipe details."""
    auth_service = AuthService(get_redis_client())
    ctx = auth_service.get_user_from_cookie(request)

    if not ctx:
        if wants_json(request):
            raise HTTPException(401, "Authentication required")
        from fastapi.responses import RedirectResponse
        return RedirectResponse(url="/auth", status_code=302)

    recipe = await recipe_service.get_recipe(recipe_id)
    if not recipe:
        raise HTTPException(404, "Recipe not found")

    if wants_json(request):
        return recipe

    # Build DAG elements for visualization
    dag_elements = []
    node_colors = {
        "input": "#3b82f6",
        "effect": "#8b5cf6",
        "analyze": "#ec4899",
        "transform": "#10b981",
        "output": "#f59e0b",
    }

    for i, step in enumerate(recipe.get("steps", [])):
        step_id = step.get("id", f"step-{i}")
        dag_elements.append({
            "data": {
                "id": step_id,
                "label": step.get("name", f"Step {i+1}"),
                "color": node_colors.get(step.get("type", "effect"), "#6b7280"),
            }
        })
        for inp in step.get("inputs", []):
            dag_elements.append({
                "data": {"source": inp, "target": step_id}
            })

    templates = get_templates(request)
    return render(templates, "recipes/detail.html", request,
        recipe=recipe,
        dag_elements=dag_elements,
        user=ctx,
        active_tab="recipes",
    )


@router.delete("/{recipe_id}")
async def delete_recipe(
    recipe_id: str,
    ctx: UserContext = Depends(require_auth),
    recipe_service: RecipeService = Depends(get_recipe_service),
):
    """Delete a recipe."""
    success, error = await recipe_service.delete_recipe(recipe_id, ctx.actor_id)
    if error:
        raise HTTPException(400 if "Cannot" in error else 404, error)
    return {"deleted": True, "recipe_id": recipe_id}


@router.post("/{recipe_id}/run")
async def run_recipe(
    recipe_id: str,
    req: RecipeRunRequest,
    ctx: UserContext = Depends(require_auth),
    recipe_service: RecipeService = Depends(get_recipe_service),
):
    """Run a recipe with given inputs."""
    from ..services.run_service import RunService
    from ..dependencies import get_cache_manager
    import database

    recipe = await recipe_service.get_recipe(recipe_id)
    if not recipe:
        raise HTTPException(404, "Recipe not found")

    try:
        import json

        # Create run using run service
        run_service = RunService(database, get_redis_client(), get_cache_manager())

        # If recipe has a DAG definition, bind inputs and convert to JSON
        recipe_dag = recipe.get("dag")
        dag_json = None
        if recipe_dag and isinstance(recipe_dag, dict):
            # Bind inputs to the DAG's source nodes
            dag_copy = json.loads(json.dumps(recipe_dag))  # Deep copy
            nodes = dag_copy.get("nodes", {})

            # Convert nodes from list to dict if needed
            if isinstance(nodes, list):
                nodes_dict = {}
                for node in nodes:
                    node_id = node.get("id")
                    if node_id:
                        nodes_dict[node_id] = node
                nodes = nodes_dict
                dag_copy["nodes"] = nodes

            # Map input names to content hashes
            for input_name, content_hash in req.inputs.items():
                if input_name in nodes:
                    node = nodes[input_name]
                    if node.get("type") == "SOURCE":
                        if "config" not in node:
                            node["config"] = {}
                        node["config"]["content_hash"] = content_hash

            dag_json = json.dumps(dag_copy)

        run, error = await run_service.create_run(
            recipe=recipe.get("name", recipe_id),
            inputs=req.inputs,
            use_dag=True,
            dag_json=dag_json,
            actor_id=ctx.actor_id,
            l2_server=ctx.l2_server,
        )

        if error:
            raise HTTPException(400, error)

        if not run:
            raise HTTPException(500, "Run creation returned no result")

        return {
            "run_id": run["run_id"] if isinstance(run, dict) else run.run_id,
            "status": run.get("status", "pending") if isinstance(run, dict) else run.status,
            "message": "Recipe execution started",
        }
    except HTTPException:
        raise
    except Exception as e:
        logger.exception(f"Error running recipe {recipe_id}")
        raise HTTPException(500, f"Run failed: {e}")


@router.get("/{recipe_id}/dag")
async def recipe_dag(
    recipe_id: str,
    request: Request,
    recipe_service: RecipeService = Depends(get_recipe_service),
):
    """Get recipe DAG visualization data."""
    recipe = await recipe_service.get_recipe(recipe_id)
    if not recipe:
        raise HTTPException(404, "Recipe not found")

    dag_elements = []
    node_colors = {
        "input": "#3b82f6",
        "effect": "#8b5cf6",
        "analyze": "#ec4899",
        "transform": "#10b981",
        "output": "#f59e0b",
    }

    for i, step in enumerate(recipe.get("steps", [])):
        step_id = step.get("id", f"step-{i}")
        dag_elements.append({
            "data": {
                "id": step_id,
                "label": step.get("name", f"Step {i+1}"),
                "color": node_colors.get(step.get("type", "effect"), "#6b7280"),
            }
        })
        for inp in step.get("inputs", []):
            dag_elements.append({
                "data": {"source": inp, "target": step_id}
            })

    return {"elements": dag_elements}


@router.delete("/{recipe_id}/ui", response_class=HTMLResponse)
async def ui_discard_recipe(
    recipe_id: str,
    request: Request,
    recipe_service: RecipeService = Depends(get_recipe_service),
):
    """HTMX handler: discard a recipe."""
    auth_service = AuthService(get_redis_client())
    ctx = auth_service.get_user_from_cookie(request)

    if not ctx:
        return HTMLResponse('<div class="text-red-400">Login required</div>', status_code=401)

    success, error = await recipe_service.delete_recipe(recipe_id, ctx.actor_id)

    if error:
        return HTMLResponse(f'<div class="text-red-400">{error}</div>')

    return HTMLResponse(
        '<div class="text-green-400">Recipe deleted</div>'
        '<script>setTimeout(() => window.location.href = "/recipes", 1500);</script>'
    )