"""MCP Calendar + Tasks Server — reads and writes calendars and tasks via CalDAV."""

import os, sys, re, contextlib, uuid
from datetime import datetime, timedelta
from typing import Annotated

import httpx, vobject
from pydantic import Field
from mcp.server.fastmcp import FastMCP
from starlette.applications import Starlette
from starlette.routing import Mount

sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
from common import get_current_user, OAUTH_ROUTES, BearerAuthMiddleware

from common import load_config as _lc
_cfg = _lc()
RADICALE = _cfg['radicale_url']
CREDS = {u: (d['username'], d['password']) for u, d in _cfg['radicale_users'].items()}
CAL_PATHS = _cfg['calendar_paths']

mcp = FastMCP("Calendar", stateless_http=True,
              transport_security={"enable_dns_rebinding_protection": False})


def _auth(user):
    c = CREDS.get(user)
    return httpx.BasicAuth(c[0], c[1]) if c else None

def _propfind(url, auth, depth=1):
    body = '<?xml version="1.0"?><d:propfind xmlns:d="DAV:" xmlns:cs="urn:ietf:params:xml:ns:caldav"><d:prop><d:resourcetype/><d:displayname/><cs:supported-calendar-component-set/></d:prop></d:propfind>'
    return httpx.request("PROPFIND", url, content=body, auth=auth, headers={"Depth": str(depth), "Content-Type": "application/xml"}, timeout=30).text

def _discover(user, comp):
    auth = _auth(user)
    cols = []
    for base in CAL_PATHS.get(user, []):
        xml = _propfind(RADICALE + base, auth)
        for m in re.finditer(r'<d:href>([^<]+)</d:href>', xml):
            href = m.group(1)
            if href.rstrip("/") == base.rstrip("/"): continue
            block = xml[m.start():xml.find("</d:response>", m.end())]
            if comp not in block: continue
            nm = re.search(r'<d:displayname>([^<]*)</d:displayname>', block)
            cols.append({"name": nm.group(1) if nm else href.split("/")[-2], "href": href})
    return cols

def _report(href, auth, start, end):
    body = f'<?xml version="1.0"?><c:calendar-query xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav"><d:prop><d:getetag/><c:calendar-data/></d:prop><c:filter><c:comp-filter name="VCALENDAR"><c:comp-filter name="VEVENT"><c:time-range start="{start}" end="{end}"/></c:comp-filter></c:comp-filter></c:filter></c:calendar-query>'
    return httpx.request("REPORT", RADICALE + href, content=body, auth=auth, headers={"Depth": "1", "Content-Type": "application/xml"}, timeout=30).text

def _report_tasks(href, auth, inc=False):
    filt = '<c:comp-filter name="VTODO"/>' if inc else '<c:comp-filter name="VTODO"><c:prop-filter name="STATUS"><c:text-match negate-condition="yes">COMPLETED</c:text-match></c:prop-filter></c:comp-filter>'
    body = f'<?xml version="1.0"?><c:calendar-query xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav"><d:prop><d:getetag/><c:calendar-data/></d:prop><c:filter><c:comp-filter name="VCALENDAR">{filt}</c:comp-filter></c:filter></c:calendar-query>'
    return httpx.request("REPORT", RADICALE + href, content=body, auth=auth, headers={"Depth": "1", "Content-Type": "application/xml"}, timeout=30).text

def _parse(xml, comp="VEVENT"):
    objs = []
    for m in re.finditer(r'<c:calendar-data[^>]*>(.*?)</c:calendar-data>', xml, re.DOTALL):
        raw = m.group(1).replace("&lt;","<").replace("&gt;",">").replace("&amp;","&")
        try:
            for c in vobject.readOne(raw).components():
                if c.name == comp: objs.append(c)
        except: pass
    return objs

def _fmt_ev(ev, cal=""):
    s = getattr(ev, 'dtstart', None)
    e = getattr(ev, 'dtend', None)
    summary = str(ev.summary.value) if hasattr(ev, 'summary') else '(kein Titel)'
    start = s.value.isoformat() if s and hasattr(s.value, 'isoformat') else str(s.value) if s else '?'
    end_s = e.value.isoformat() if e and hasattr(e.value, 'isoformat') else ''
    loc = str(ev.location.value) if hasattr(ev, 'location') and ev.location.value else ''
    desc = str(ev.description.value)[:300] if hasattr(ev, 'description') and ev.description.value else ''
    uid = str(ev.uid.value) if hasattr(ev, 'uid') else ''
    status = str(ev.status.value) if hasattr(ev, 'status') else ''
    attendees = []
    if hasattr(ev, 'attendee_list'):
        for att in ev.attendee_list:
            cn = att.params.get("CN", [""])[0] if hasattr(att, 'params') and att.params else ""
            ps = att.params.get("PARTSTAT", [""])[0] if hasattr(att, 'params') and att.params else ""
            attendees.append(f"{cn} ({ps})" if cn else str(att.value))
    rrule = str(ev.rrule.value) if hasattr(ev, 'rrule') else ''
    parts = [f"[{cal}] {summary}" if cal else summary]
    parts.append(f"  Wann: {start}" + (f" bis {end_s}" if end_s else ""))
    if loc: parts.append(f"  Ort: {loc}")
    if desc: parts.append(f"  Beschreibung: {desc}")
    if status: parts.append(f"  Status: {status}")
    if attendees: parts.append(f"  Teilnehmer: {', '.join(attendees[:8])}")
    if rrule: parts.append(f"  Wiederholung: {rrule}")
    parts.append(f"  UID: {uid}")
    return "\n".join(parts)

def _fmt_task(t, lst=""):
    summary = str(t.summary.value) if hasattr(t, 'summary') else '(kein Titel)'
    status = str(t.status.value) if hasattr(t, 'status') else 'NEEDS-ACTION'
    due = t.due.value.isoformat() if hasattr(t, 'due') and hasattr(t.due.value, 'isoformat') else str(t.due.value) if hasattr(t, 'due') else ''
    pri = int(t.priority.value) if hasattr(t, 'priority') else 0
    uid = str(t.uid.value) if hasattr(t, 'uid') else ''
    desc = str(t.description.value)[:200] if hasattr(t, 'description') and t.description.value else ''
    chk = '[x]' if status == 'COMPLETED' else '[ ]'
    parts = [f"[{lst}] {chk} {summary}" if lst else f"{chk} {summary}"]
    if due: parts.append(f"  Faellig: {due}")
    if pri: parts.append(f"  Prioritaet: {pri} (1=hoechste, 9=niedrigste)")
    if desc: parts.append(f"  Notiz: {desc}")
    parts.append(f"  UID: {uid}")
    return "\n".join(parts)


@mcp.tool()
def list_calendars() -> str:
    """List all calendars available to the user (personal + shared). Call this first to see calendar names."""
    user = get_current_user()
    if not user: return "Error: not authenticated"
    cals = _discover(user, "VEVENT")
    return "\n".join(f"{c['name']}" for c in cals) if cals else "Keine Kalender gefunden"


@mcp.tool()
def get_events(
    calendar: Annotated[str, Field(description="Calendar name from list_calendars, e.g. 'Stefan', 'Arbeit', 'Familie'. Use partial match.")],
    date_from: Annotated[str, Field(description="Start date as YYYY-MM-DD, e.g. '2026-06-12'")],
    date_to: Annotated[str, Field(description="End date as YYYY-MM-DD, e.g. '2026-06-19'")],
) -> str:
    """Get all events from a calendar within a date range. Returns title, time, location, attendees, and UID."""
    user = get_current_user()
    if not user: return "Error: not authenticated"
    cals = [c for c in _discover(user, "VEVENT") if calendar.lower() in c["name"].lower()]
    if not cals: return f"Kalender '{calendar}' nicht gefunden. Nutze list_calendars."
    s = datetime.strptime(date_from, "%Y-%m-%d").strftime("%Y%m%dT000000Z")
    e = datetime.strptime(date_to, "%Y-%m-%d").strftime("%Y%m%dT235959Z")
    results = []
    for cal in cals:
        for ev in _parse(_report(cal["href"], _auth(user), s, e)):
            results.append(_fmt_ev(ev, cal["name"]))
    return "\n\n".join(results) if results else "Keine Termine in diesem Zeitraum"


@mcp.tool()
def search_events(
    query: Annotated[str, Field(description="Search term — matches title, description, location. Example: 'Zahnarzt', 'Meeting', 'Berlin'")],
    date_from: Annotated[str, Field(description="Start date YYYY-MM-DD. Default: 90 days ago")] = "",
    date_to: Annotated[str, Field(description="End date YYYY-MM-DD. Default: 1 year ahead")] = "",
) -> str:
    """Search events by keyword across all calendars. Returns matching events with details."""
    user = get_current_user()
    if not user: return "Error: not authenticated"
    if not date_from: date_from = (datetime.now() - timedelta(days=90)).strftime("%Y-%m-%d")
    if not date_to: date_to = (datetime.now() + timedelta(days=365)).strftime("%Y-%m-%d")
    s = datetime.strptime(date_from, "%Y-%m-%d").strftime("%Y%m%dT000000Z")
    e = datetime.strptime(date_to, "%Y-%m-%d").strftime("%Y%m%dT235959Z")
    q = query.lower()
    results = []
    for cal in _discover(user, "VEVENT"):
        for ev in _parse(_report(cal["href"], _auth(user), s, e)):
            txt = f"{ev.summary.value if hasattr(ev,'summary') else ''} {ev.description.value if hasattr(ev,'description') else ''} {ev.location.value if hasattr(ev,'location') else ''}".lower()
            if q in txt:
                results.append(_fmt_ev(ev, cal["name"]))
    return "\n\n".join(results[:30]) if results else "Keine Treffer"


@mcp.tool()
def list_task_lists() -> str:
    """List all task lists (Erinnerungen/Reminders). Call this first before get_tasks."""
    user = get_current_user()
    if not user: return "Error: not authenticated"
    lists = _discover(user, "VTODO")
    return "\n".join(f"{l['name']}" for l in lists) if lists else "Keine Aufgabenlisten"


@mcp.tool()
def get_tasks(
    task_list: Annotated[str, Field(description="Task list name from list_task_lists, e.g. 'Erinnerungen'. Leave empty for all lists.")] = "",
    include_completed: Annotated[bool, Field(description="Also show completed tasks")] = False,
) -> str:
    """Get tasks/reminders from a task list. Shows title, due date, priority, and status."""
    user = get_current_user()
    if not user: return "Error: not authenticated"
    lists = _discover(user, "VTODO")
    if task_list: lists = [l for l in lists if task_list.lower() in l["name"].lower()]
    results = []
    for lst in lists:
        for t in _parse(_report_tasks(lst["href"], _auth(user), include_completed), "VTODO"):
            results.append(_fmt_task(t, lst["name"]))
    return "\n\n".join(results) if results else "Keine Aufgaben"


def _geocode(address):
    """Geocode an address via Nominatim. Returns (lat, lon, display_name) or None."""
    try:
        r = httpx.get("https://nominatim.openstreetmap.org/search",
                       params={"q": address, "format": "json", "limit": 1},
                       headers={"User-Agent": "mcp-home/1.0"}, timeout=10)
        results = r.json()
        if results:
            return float(results[0]["lat"]), float(results[0]["lon"]), results[0].get("display_name", address)
    except Exception:
        pass
    return None


@mcp.tool()
def create_event(
    calendar: Annotated[str, Field(description="Calendar name, e.g. 'Stefan', 'Arbeit', 'Familie'")],
    title: Annotated[str, Field(description="Event title")],
    start: Annotated[str, Field(description="Start: YYYY-MM-DD for all-day, or YYYY-MM-DDTHH:MM for timed events, e.g. '2026-06-15T14:00'")],
    end: Annotated[str, Field(description="End: YYYY-MM-DD for all-day, or YYYY-MM-DDTHH:MM, e.g. '2026-06-15T15:30'")],
    location: Annotated[str, Field(description="Location or address, e.g. 'Marienplatz 1, Muenchen'. Gets geocoded for map display.")] = "",
    description: Annotated[str, Field(description="Event description or notes")] = "",
    allday: Annotated[bool, Field(description="True for all-day events (then use YYYY-MM-DD for start/end)")] = False,
    travel_minutes: Annotated[int, Field(description="Travel time in minutes shown before the event on iPhone (0=none, e.g. 30 for 30 min commute)")] = 0,
    reminder_minutes: Annotated[int, Field(description="Reminder alert X minutes before the event (0=none, e.g. 15, 30, 60)")] = 0,
) -> str:
    """Create a new calendar event. For all-day events, end date is exclusive (June 15 only → start=2026-06-15, end=2026-06-16). Location is geocoded for map pins. Travel time shows as block before the event on iPhone."""
    user = get_current_user()
    if not user: return "Error: not authenticated"
    cals = [c for c in _discover(user, "VEVENT") if calendar.lower() in c["name"].lower()]
    if not cals: return f"Kalender '{calendar}' nicht gefunden"
    uid = str(uuid.uuid4())
    cal = vobject.iCalendar()
    ev = cal.add("vevent")
    ev.add("uid").value = uid
    ev.add("summary").value = title
    if allday:
        ev.add("dtstart").value = datetime.strptime(start, "%Y-%m-%d").date()
        ev.add("dtend").value = datetime.strptime(end, "%Y-%m-%d").date()
    else:
        ev.add("dtstart").value = datetime.fromisoformat(start)
        ev.add("dtend").value = datetime.fromisoformat(end)
    if location:
        ev.add("location").value = location
        geo = _geocode(location)
        if geo:
            lat, lon, display = geo
            loc_prop = ev.add("x-apple-structured-location")
            loc_prop.value = f"geo:{lat},{lon}"
            loc_prop.params["VALUE"] = ["URI"]
            loc_prop.params["X-APPLE-RADIUS"] = ["70"]
            loc_prop.params["X-APPLE-REFERENCEFRAME"] = ["1"]
            loc_prop.params["X-TITLE"] = [location]
    if description:
        ev.add("description").value = description
    if travel_minutes > 0:
        tp = ev.add("x-apple-travel-duration")
        tp.value = f"PT{travel_minutes}M"
        tp.params["VALUE"] = ["DURATION"]
    if reminder_minutes > 0:
        alarm = ev.add("valarm")
        alarm.add("action").value = "DISPLAY"
        alarm.add("description").value = title
        alarm.add("trigger").value = timedelta(minutes=-reminder_minutes)
    ev.add("dtstamp").value = datetime.utcnow()
    r = httpx.put(RADICALE + cals[0]["href"] + uid + ".ics", content=cal.serialize(), auth=_auth(user), headers={"Content-Type": "text/calendar"}, timeout=15)
    extras = []
    if location and _geocode(location): extras.append("mit Karte")
    if travel_minutes: extras.append(f"{travel_minutes} Min. Fahrzeit")
    if reminder_minutes: extras.append(f"Erinnerung {reminder_minutes} Min. vorher")
    extra_str = f" ({', '.join(extras)})" if extras else ""
    return f"Termin erstellt: {title} am {start}{extra_str}" if r.status_code in (201, 204) else f"Fehler: HTTP {r.status_code}"


@mcp.tool()
def create_task(
    task_list: Annotated[str, Field(description="Task list name, e.g. 'Erinnerungen', 'Langzeiterinnerungen'")],
    title: Annotated[str, Field(description="Task title")],
    due: Annotated[str, Field(description="Due date: YYYY-MM-DD or YYYY-MM-DDTHH:MM. Leave empty for no due date.")] = "",
    priority: Annotated[int, Field(description="Priority 1-9 (1=highest, 9=lowest, 0=none)")] = 0,
    description: Annotated[str, Field(description="Task notes")] = "",
) -> str:
    """Create a new task/reminder in the specified list."""
    user = get_current_user()
    if not user: return "Error: not authenticated"
    lists = [l for l in _discover(user, "VTODO") if task_list.lower() in l["name"].lower()]
    if not lists: return f"Liste '{task_list}' nicht gefunden"
    uid = str(uuid.uuid4())
    cal = vobject.iCalendar()
    todo = cal.add("vtodo")
    todo.add("uid").value = uid
    todo.add("summary").value = title
    todo.add("status").value = "NEEDS-ACTION"
    if due: todo.add("due").value = datetime.fromisoformat(due) if "T" in due else datetime.strptime(due, "%Y-%m-%d").date()
    if priority: todo.add("priority").value = str(priority)
    if description: todo.add("description").value = description
    todo.add("dtstamp").value = datetime.utcnow()
    r = httpx.put(RADICALE + lists[0]["href"] + uid + ".ics", content=cal.serialize(), auth=_auth(user), headers={"Content-Type": "text/calendar"}, timeout=15)
    return f"Aufgabe erstellt: {title}" if r.status_code in (201, 204) else f"Fehler: HTTP {r.status_code}"


def create_app():
    from contextlib import asynccontextmanager
    mcp_app = mcp.streamable_http_app()
    @asynccontextmanager
    async def lifespan(app):
        async with contextlib.AsyncExitStack() as stack:
            await stack.enter_async_context(mcp_app.router.lifespan_context(mcp_app))
            yield
    routes = list(OAUTH_ROUTES) + [Mount("/", app=mcp_app)]
    app = Starlette(routes=routes, lifespan=lifespan)
    app.add_middleware(BearerAuthMiddleware)
    return app

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(create_app(), host="127.0.0.1", port=5101)