"""Passenger MCP server — tools, resources, and prompts for the FCE agent only.

Covers: passenger notification generation, flight manifest, and
notification prompt template (multi-tone).
"""

import json

from fastmcp import FastMCP

from mcp_servers.data.models import MPStatus
from mcp_servers.data.scenarios.manager import scenario_manager

mcp = FastMCP(
    "stellar-ops-passenger",
    instructions=(
        "Passenger-facing tools — notification narrative generation "
        "and flight manifest access. Restricted to customer-facing clients."
    ),
)


# ── Tools ──────────────────────────────────────────────────────────


@mcp.tool()
async def generate_notification(context: dict) -> str:
    """Synthesizes flight disruption context into an empathetic,
    actionable passenger notification.

    Uses Claude via Anthropic SDK (or Bedrock when USE_BEDROCK=true).
    Output: clear, human, no jargon, includes gate/time/status.
    Falls back to template if no API key is configured.
    """
    try:
        from mcp_servers.shared_llm import generate, _get_provider

        system_prompt = (
            "You are a passenger notification system for Stellar Air. "
            "Write a clear, empathetic notification about this flight disruption. "
            "Explain WHY the delay or cancellation happened using the operational data provided. "
            "Tell the passenger what's happening next: new boarding time, gate, status. "
            "Be human and reassuring. No aviation jargon. No speculation. "
            "If data is missing for a section, omit it — don't make things up."
        )
        text = await generate(system_prompt, json.dumps(context, indent=2))
        return json.dumps({"text": text, "provider": _get_provider()})
    except Exception:
        return json.dumps({"text": _template_notification(context), "provider": "template"})


def _template_notification(context: dict) -> str:
    """Structured template fallback when LLM is unavailable."""
    flight_id = context.get("flight_id", "")
    origin = context.get("origin", "")
    destination = context.get("destination", "")
    status = context.get("status", "DELAYED")
    delay_minutes = context.get("delay_minutes", 0)
    delay_cause = context.get("delay_cause", "")
    gate = context.get("gate", "")
    weather_summary = context.get("weather_summary", "")
    crew_notes_summary = context.get("crew_notes_summary", "")

    lines = [
        f"{flight_id} — {origin} → {destination}",
        f"Status: {status}" + (f" {delay_minutes} minutes" if delay_minutes else ""),
        "",
    ]

    if weather_summary:
        lines.append(f"Your flight is delayed due to {weather_summary}.")
    elif delay_cause:
        cause_text = {
            "WEATHER": "weather conditions along your route",
            "MAINTENANCE": "a routine maintenance check on your aircraft",
            "CREW": "ensuring your crew is fully rested for safe operation",
            "ATC": "air traffic control restrictions",
            "LATE_AIRCRAFT": "the late arrival of your inbound aircraft",
        }.get(delay_cause, f"{delay_cause.lower()}")
        lines.append(f"Your flight is delayed due to {cause_text}.")

    if crew_notes_summary:
        lines.append(crew_notes_summary)

    if gate:
        lines.append(f"\nGate {gate} — no gate change expected.")

    return "\n".join(lines)


# ── Resources ──────────────────────────────────────────────────────


@mcp.resource("ops://flights/{flight_id}/manifest")
def flight_manifest(flight_id: str) -> str:
    """Passenger manifest summary for a flight.

    Returns: flight_id, passenger count, count by MP status tier,
    special needs count, connection count.
    Summary-level — no PII exposed through this resource.
    """
    flight = None
    for f in scenario_manager.flights:
        if f.flight_id == flight_id:
            flight = f
            break

    if not flight:
        return json.dumps({"error": f"Flight {flight_id} not found"})

    # Count passengers by status from scenario data
    pax_on_flight = [
        p for p in scenario_manager.passengers
        if p.flight_id == flight_id
    ]

    status_counts = {}
    special_needs_count = 0
    connection_count = 0

    for p in pax_on_flight:
        status = p.mileage_plus_status.value
        status_counts[status] = status_counts.get(status, 0) + 1
        if p.special_needs:
            special_needs_count += 1
        if p.connection_flight:
            connection_count += 1

    return json.dumps({
        "flight_id": flight_id,
        "total_passengers": flight.passenger_count,
        "by_status": status_counts,
        "special_needs_count": special_needs_count,
        "connection_count": connection_count,
    })


# ── Prompts ────────────────────────────────────────────────────────


TONE_INSTRUCTIONS = {
    "empathetic": (
        "Write a passenger notification about this flight disruption. "
        "Be empathetic and human. Explain WHY the delay/cancellation happened "
        "using the weather, maintenance, or operational data provided. "
        "Tell the passenger what's happening next: new boarding time, gate, "
        "rebooking options. End with reassurance. No jargon."
    ),
    "factual": (
        "Write a brief, factual notification. Include: flight number, "
        "route, status, delay duration, cause (one phrase), new departure time, "
        "gate. No editorial. No reassurance. Just facts."
    ),
    "brief_sms": (
        "Write an SMS-length notification (under 160 characters). "
        "Format: UA{flight} {route}: {status}. {cause}. New dep: {time}. Gate {gate}."
    ),
}


@mcp.prompt()
def passenger_notification(tone: str = "empathetic") -> str:
    """Template for generating passenger delay/cancellation notifications.

    tone: empathetic (default) | factual | brief_sms
    """
    instruction = TONE_INSTRUCTIONS.get(tone, TONE_INSTRUCTIONS["empathetic"])
    return (
        f"{instruction}\n\n"
        "Use the operational data provided below. Do not invent details. "
        "If data is missing for a section, omit that section."
    )