"""
Home and root routes for L1 server.
"""

from pathlib import Path

import markdown
from fastapi import APIRouter, Request, Depends, HTTPException
from fastapi.responses import HTMLResponse, RedirectResponse, FileResponse

from artdag_common import render
from artdag_common.middleware import wants_html

from ..dependencies import get_templates, get_current_user

router = APIRouter()


async def get_user_stats(actor_id: str) -> dict:
    """Get stats for a user."""
    import database
    from ..services.recipe_service import RecipeService
    from ..services.run_service import RunService
    from ..dependencies import get_redis_client, get_cache_manager

    stats = {}

    try:
        stats["media"] = await database.count_user_items(actor_id)
    except Exception:
        stats["media"] = 0

    try:
        recipe_service = RecipeService(get_redis_client(), get_cache_manager())
        recipes = await recipe_service.list_recipes(actor_id)
        stats["recipes"] = len(recipes)
    except Exception:
        stats["recipes"] = 0

    try:
        run_service = RunService(database, get_redis_client(), get_cache_manager())
        runs = await run_service.list_runs(actor_id)
        stats["runs"] = len(runs)
    except Exception:
        stats["runs"] = 0

    try:
        storage_providers = await database.get_user_storage_providers(actor_id)
        stats["storage"] = len(storage_providers) if storage_providers else 0
    except Exception:
        stats["storage"] = 0

    try:
        effects_dir = Path(get_cache_manager().cache_dir) / "_effects"
        if effects_dir.exists():
            stats["effects"] = len([d for d in effects_dir.iterdir() if d.is_dir()])
        else:
            stats["effects"] = 0
    except Exception:
        stats["effects"] = 0

    return stats


@router.get("/api/stats")
async def api_stats(request: Request):
    """Get user stats as JSON for CLI and API clients."""
    user = await get_current_user(request)
    if not user:
        raise HTTPException(401, "Authentication required")

    stats = await get_user_stats(user.actor_id)
    return stats


@router.delete("/api/clear-data")
async def clear_user_data(request: Request):
    """
    Clear all user L1 data except storage configuration.

    Deletes: runs, recipes, effects, media/cache items.
    Preserves: storage provider configurations.
    """
    import logging
    logger = logging.getLogger(__name__)

    user = await get_current_user(request)
    if not user:
        raise HTTPException(401, "Authentication required")

    import database
    from ..services.recipe_service import RecipeService
    from ..services.run_service import RunService
    from ..dependencies import get_redis_client, get_cache_manager

    actor_id = user.actor_id
    username = user.username
    deleted = {
        "runs": 0,
        "recipes": 0,
        "effects": 0,
        "media": 0,
    }
    errors = []

    # Delete all runs
    try:
        run_service = RunService(database, get_redis_client(), get_cache_manager())
        runs = await run_service.list_runs(actor_id, offset=0, limit=10000)
        for run in runs:
            try:
                await run_service.discard_run(run["run_id"], actor_id, username)
                deleted["runs"] += 1
            except Exception as e:
                errors.append(f"Run {run['run_id']}: {e}")
    except Exception as e:
        errors.append(f"Failed to list runs: {e}")

    # Delete all recipes
    try:
        recipe_service = RecipeService(get_redis_client(), get_cache_manager())
        recipes = await recipe_service.list_recipes(actor_id, offset=0, limit=10000)
        for recipe in recipes:
            try:
                await recipe_service.delete_recipe(recipe["recipe_id"], actor_id)
                deleted["recipes"] += 1
            except Exception as e:
                errors.append(f"Recipe {recipe['recipe_id']}: {e}")
    except Exception as e:
        errors.append(f"Failed to list recipes: {e}")

    # Delete all effects
    try:
        cache_manager = get_cache_manager()
        effects_dir = Path(cache_manager.cache_dir) / "_effects"
        if effects_dir.exists():
            import shutil
            for effect_dir in effects_dir.iterdir():
                if effect_dir.is_dir():
                    try:
                        shutil.rmtree(effect_dir)
                        deleted["effects"] += 1
                    except Exception as e:
                        errors.append(f"Effect {effect_dir.name}: {e}")
    except Exception as e:
        errors.append(f"Failed to delete effects: {e}")

    # Delete all media/cache items for user
    try:
        items = await database.get_user_items(actor_id, limit=10000)
        for item in items:
            try:
                cid = item.get("cid")
                if cid:
                    await database.delete_cache_item(cid)
                    deleted["media"] += 1
            except Exception as e:
                errors.append(f"Media {item.get('cid', 'unknown')}: {e}")
    except Exception as e:
        errors.append(f"Failed to list media: {e}")

    logger.info(f"Cleared data for {actor_id}: {deleted}")
    if errors:
        logger.warning(f"Errors during clear: {errors[:10]}")  # Log first 10 errors

    return {
        "message": "User data cleared",
        "deleted": deleted,
        "errors": errors[:10] if errors else [],  # Return first 10 errors
        "storage_preserved": True,
    }


@router.get("/")
async def home(request: Request):
    """
    Home page - show README and stats.
    """
    user = await get_current_user(request)

    # Load README
    readme_html = ""
    try:
        readme_path = Path(__file__).parent.parent.parent / "README.md"
        if readme_path.exists():
            readme_html = markdown.markdown(readme_path.read_text(), extensions=['tables', 'fenced_code'])
    except Exception:
        pass

    # Get stats for current user
    stats = {}
    if user:
        stats = await get_user_stats(user.actor_id)

    templates = get_templates(request)
    return render(templates, "home.html", request,
        user=user,
        readme_html=readme_html,
        stats=stats,
        nav_counts=stats,  # Reuse stats for nav counts
        active_tab="home",
    )


@router.get("/login")
async def login_redirect(request: Request):
    """
    Redirect to L2 for login.
    """
    from ..config import settings

    if settings.l2_server:
        # Redirect to L2 login with return URL
        return_url = str(request.url_for("auth_callback"))
        login_url = f"{settings.l2_server}/login?return_to={return_url}"
        return RedirectResponse(url=login_url, status_code=302)

    # No L2 configured - show error
    return HTMLResponse(
        "<html><body><h1>Login not configured</h1>"
        "<p>No L2 server configured for authentication.</p></body></html>",
        status_code=503
    )


# Client tarball path
CLIENT_TARBALL = Path(__file__).parent.parent.parent / "artdag-client.tar.gz"


@router.get("/download/client")
async def download_client():
    """Download the Art DAG CLI client."""
    if not CLIENT_TARBALL.exists():
        raise HTTPException(404, "Client package not found. Run build-client.sh to create it.")
    return FileResponse(
        CLIENT_TARBALL,
        media_type="application/gzip",
        filename="artdag-client.tar.gz"
    )