"""
Life OS - Main Application
FastAPI server-rendered monolith with async PostgreSQL.
"""

import os
from pathlib import Path
from contextlib import asynccontextmanager
from dotenv import load_dotenv

load_dotenv()

from fastapi import FastAPI, Request
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from fastapi.responses import RedirectResponse

from core.database import check_db
from core.sidebar import get_sidebar_data
from core.database import get_db

# Import routers
from routers import (
    domains as domains_router,
    areas as areas_router,
    projects as projects_router,
    tasks as tasks_router,
    notes as notes_router,
    links as links_router,
    focus as focus_router,
    capture as capture_router,
    contacts as contacts_router,
    search as search_router,
    admin as admin_router,
    lists as lists_router,
    files as files_router,
    meetings as meetings_router,
    decisions as decisions_router,
    weblinks as weblinks_router,
    appointments as appointments_router,
    time_tracking as time_tracking_router,
    processes as processes_router,
)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Startup/shutdown events."""
    # Verify database connection
    try:
        ok = await check_db()
        if ok:
            print("Database connection OK")
        else:
            print("WARNING: Database check returned unexpected result")
    except Exception as e:
        print(f"WARNING: Database connection failed: {e}")
    yield


app = FastAPI(
    title="Life OS",
    version="1.0.0",
    lifespan=lifespan,
)

# Static files
app.mount("/static", StaticFiles(directory="static"), name="static")

# Templates
templates = Jinja2Templates(directory="templates")


# ---- Template globals and filters ----

from starlette.types import ASGIApp, Receive, Scope, Send

class RequestContextMiddleware:
    """Pure ASGI middleware - avoids BaseHTTPMiddleware's TaskGroup issues with asyncpg."""
    def __init__(self, app: ASGIApp):
        self.app = app
        self.environment = os.getenv("ENVIRONMENT", "production")

    async def __call__(self, scope: Scope, receive: Receive, send: Send):
        if scope["type"] == "http":
            scope.setdefault("state", {})["environment"] = self.environment
        await self.app(scope, receive, send)

app.add_middleware(RequestContextMiddleware)


# ---- Dashboard ----

@app.get("/")
async def dashboard(request: Request):
    """Main dashboard view."""
    from core.database import async_session_factory
    async with async_session_factory() as db:
        sidebar = await get_sidebar_data(db)

        # Today's focus items
        from sqlalchemy import text
        result = await db.execute(text("""
            SELECT df.*, t.title, t.priority, t.status as task_status,
                   t.project_id, p.name as project_name,
                   d.name as domain_name, d.color as domain_color
            FROM daily_focus df
            JOIN tasks t ON df.task_id = t.id
            LEFT JOIN projects p ON t.project_id = p.id
            LEFT JOIN domains d ON t.domain_id = d.id
            WHERE df.focus_date = CURRENT_DATE AND df.is_deleted = false
            ORDER BY df.sort_order, df.created_at
        """))
        focus_items = [dict(r._mapping) for r in result]

        # Overdue tasks
        result = await db.execute(text("""
            SELECT t.*, d.name as domain_name, d.color as domain_color,
                   p.name as project_name
            FROM tasks t
            LEFT JOIN domains d ON t.domain_id = d.id
            LEFT JOIN projects p ON t.project_id = p.id
            WHERE t.is_deleted = false AND t.status NOT IN ('done', 'cancelled')
                AND t.due_date < CURRENT_DATE
            ORDER BY t.due_date ASC
            LIMIT 10
        """))
        overdue_tasks = [dict(r._mapping) for r in result]

        # Upcoming deadlines (next 7 days)
        result = await db.execute(text("""
            SELECT t.*, d.name as domain_name, d.color as domain_color,
                   p.name as project_name
            FROM tasks t
            LEFT JOIN domains d ON t.domain_id = d.id
            LEFT JOIN projects p ON t.project_id = p.id
            WHERE t.is_deleted = false AND t.status NOT IN ('done', 'cancelled')
                AND t.due_date >= CURRENT_DATE AND t.due_date <= CURRENT_DATE + INTERVAL '7 days'
            ORDER BY t.due_date ASC
            LIMIT 10
        """))
        upcoming_tasks = [dict(r._mapping) for r in result]

        # Task stats
        result = await db.execute(text("""
            SELECT
                count(*) FILTER (WHERE status NOT IN ('done', 'cancelled')) as open_tasks,
                count(*) FILTER (WHERE status = 'done' AND completed_at >= CURRENT_DATE - INTERVAL '7 days') as done_this_week,
                count(*) FILTER (WHERE status = 'in_progress') as in_progress
            FROM tasks WHERE is_deleted = false
        """))
        stats = dict(result.first()._mapping)

    return templates.TemplateResponse("dashboard.html", {
        "request": request,
        "sidebar": sidebar,
        "focus_items": focus_items,
        "overdue_tasks": overdue_tasks,
        "upcoming_tasks": upcoming_tasks,
        "stats": stats,
        "page_title": "Dashboard",
        "active_nav": "dashboard",
    })


# ---- Health check ----

@app.get("/health")
async def health():
    try:
        ok = await check_db()
        return {"status": "ok" if ok else "degraded", "database": ok}
    except Exception as e:
        return {"status": "error", "database": False, "error": str(e)}


# ---- Include routers ----

app.include_router(domains_router.router)
app.include_router(areas_router.router)
app.include_router(projects_router.router)
app.include_router(tasks_router.router)
app.include_router(notes_router.router)
app.include_router(links_router.router)
app.include_router(focus_router.router)
app.include_router(capture_router.router)
app.include_router(contacts_router.router)
app.include_router(search_router.router)
app.include_router(admin_router.router)
app.include_router(lists_router.router)
app.include_router(files_router.router)
app.include_router(meetings_router.router)
app.include_router(decisions_router.router)
app.include_router(weblinks_router.router)
app.include_router(appointments_router.router)
app.include_router(time_tracking_router.router)
app.include_router(processes_router.router)