import json
from typing import Any, Dict, Optional

from app.core.database import execute_query, execute_query_single


class MissionService:
    @staticmethod
    def get_ring_timeout_seconds() -> int:
        raw = MissionService.get_setting_value("mission_call_ring_timeout_seconds", "180") or "180"
        try:
            value = int(raw)
        except (TypeError, ValueError):
            value = 180
        return max(30, min(value, 3600))

    @staticmethod
    def expire_stale_ringing_calls() -> None:
        timeout_seconds = MissionService.get_ring_timeout_seconds()
        execute_query(
            """
            UPDATE mission_call_state
            SET state = 'hangup',
                ended_at = COALESCE(ended_at, NOW()),
                updated_at = NOW()
            WHERE state = 'ringing'
              AND started_at < (NOW() - make_interval(secs => %s))
            """,
            (timeout_seconds,),
        )

    @staticmethod
    def get_setting_value(key: str, default: Optional[str] = None) -> Optional[str]:
        row = execute_query_single("SELECT value FROM settings WHERE key = %s", (key,))
        if not row:
            return default
        value = row.get("value")
        if value is None or value == "":
            return default
        return str(value)

    @staticmethod
    def parse_json_setting(key: str, default: Any) -> Any:
        raw = MissionService.get_setting_value(key, None)
        if raw is None:
            return default
        try:
            return json.loads(raw)
        except Exception:
            return default

    @staticmethod
    def build_alert_key(service_name: str, customer_name: Optional[str]) -> str:
        customer_part = (customer_name or "").strip().lower() or "global"
        return f"{service_name.strip().lower()}::{customer_part}"

    @staticmethod
    def resolve_contact_context(caller_number: Optional[str]) -> Dict[str, Optional[str]]:
        if not caller_number:
            return {"contact_name": None, "company_name": None, "customer_tag": None}

        query = """
            SELECT
                c.id,
                c.first_name,
                c.last_name,
                (
                    SELECT cu.name
                    FROM contact_companies cc
                    JOIN customers cu ON cu.id = cc.customer_id
                    WHERE cc.contact_id = c.id
                    ORDER BY cc.is_primary DESC NULLS LAST, cc.id ASC
                    LIMIT 1
                ) AS company_name,
                (
                    SELECT t.name
                    FROM entity_tags et
                    JOIN tags t ON t.id = et.tag_id
                    WHERE et.entity_type = 'contact'
                      AND et.entity_id = c.id
                      AND LOWER(t.name) IN ('vip', 'serviceaftale', 'service agreement')
                    ORDER BY t.name
                    LIMIT 1
                ) AS customer_tag
            FROM contacts c
            WHERE RIGHT(regexp_replace(COALESCE(c.phone, ''), '\\D', '', 'g'), 8) = RIGHT(regexp_replace(%s, '\\D', '', 'g'), 8)
               OR RIGHT(regexp_replace(COALESCE(c.mobile, ''), '\\D', '', 'g'), 8) = RIGHT(regexp_replace(%s, '\\D', '', 'g'), 8)
            LIMIT 1
        """
        row = execute_query_single(query, (caller_number, caller_number))
        if not row:
            return {"contact_name": None, "company_name": None, "customer_tag": None}

        contact_name = f"{(row.get('first_name') or '').strip()} {(row.get('last_name') or '').strip()}".strip() or None
        return {
            "contact_name": contact_name,
            "company_name": row.get("company_name"),
            "customer_tag": row.get("customer_tag"),
        }

    @staticmethod
    def insert_event(
        *,
        event_type: str,
        title: str,
        severity: str = "info",
        source: Optional[str] = None,
        customer_name: Optional[str] = None,
        payload: Optional[Dict[str, Any]] = None,
    ) -> Dict[str, Any]:
        rows = execute_query(
            """
            INSERT INTO mission_events (event_type, severity, title, source, customer_name, payload)
            VALUES (%s, %s, %s, %s, %s, %s::jsonb)
            RETURNING id, event_type, severity, title, source, customer_name, payload, created_at
            """,
            (event_type, severity, title, source, customer_name, json.dumps(payload or {})),
        )
        return rows[0] if rows else {}

    @staticmethod
    def get_kpis() -> Dict[str, int]:
        query = """
            SELECT
                COUNT(*) FILTER (WHERE deleted_at IS NULL AND LOWER(status) <> 'afsluttet') AS open_cases,
                COUNT(*) FILTER (WHERE deleted_at IS NULL AND LOWER(status) = 'åben' AND ansvarlig_bruger_id IS NULL) AS new_cases,
                COUNT(*) FILTER (WHERE deleted_at IS NULL AND LOWER(status) <> 'afsluttet' AND ansvarlig_bruger_id IS NULL) AS unassigned_cases,
                COUNT(*) FILTER (WHERE deleted_at IS NULL AND LOWER(status) <> 'afsluttet' AND deadline IS NOT NULL AND deadline::date = CURRENT_DATE) AS deadlines_today,
                COUNT(*) FILTER (WHERE deleted_at IS NULL AND LOWER(status) <> 'afsluttet' AND deadline IS NOT NULL AND deadline::date < CURRENT_DATE) AS overdue_deadlines
            FROM sag_sager
        """
        row = execute_query_single(query) or {}
        return {
            "open_cases": int(row.get("open_cases") or 0),
            "new_cases": int(row.get("new_cases") or 0),
            "unassigned_cases": int(row.get("unassigned_cases") or 0),
            "deadlines_today": int(row.get("deadlines_today") or 0),
            "overdue_deadlines": int(row.get("overdue_deadlines") or 0),
        }

    @staticmethod
    def get_employee_deadlines() -> list[Dict[str, Any]]:
        rows = execute_query(
            """
            SELECT
                COALESCE(u.full_name, u.username, 'Ukendt') AS employee_name,
                COUNT(*) FILTER (WHERE s.deadline::date = CURRENT_DATE) AS deadlines_today,
                COUNT(*) FILTER (WHERE s.deadline::date < CURRENT_DATE) AS overdue_deadlines
            FROM sag_sager s
            LEFT JOIN users u ON u.user_id = s.ansvarlig_bruger_id
            WHERE s.deleted_at IS NULL
              AND LOWER(s.status) <> 'afsluttet'
              AND s.deadline IS NOT NULL
            GROUP BY COALESCE(u.full_name, u.username, 'Ukendt')
            HAVING COUNT(*) FILTER (WHERE s.deadline::date = CURRENT_DATE) > 0
               OR COUNT(*) FILTER (WHERE s.deadline::date < CURRENT_DATE) > 0
            ORDER BY overdue_deadlines DESC, deadlines_today DESC, employee_name ASC
            """
        ) or []
        return [
            {
                "employee_name": row.get("employee_name"),
                "deadlines_today": int(row.get("deadlines_today") or 0),
                "overdue_deadlines": int(row.get("overdue_deadlines") or 0),
            }
            for row in rows
        ]

    @staticmethod
    def get_active_calls() -> list[Dict[str, Any]]:
        MissionService.expire_stale_ringing_calls()
        rows = execute_query(
            """
            SELECT call_id, queue_name, caller_number, contact_name, company_name, customer_tag, state, started_at, answered_at, ended_at, updated_at
            FROM mission_call_state
            WHERE state = 'ringing'
            ORDER BY started_at DESC
            """
        )
        return rows or []

    @staticmethod
    def get_active_alerts() -> list[Dict[str, Any]]:
        rows = execute_query(
            """
            SELECT alert_key, service_name, customer_name, status, is_active, started_at, resolved_at, updated_at
            FROM mission_uptime_alerts
            WHERE is_active = TRUE
            ORDER BY started_at ASC NULLS LAST
            """
        )
        return rows or []

    @staticmethod
    def get_live_feed(limit: int = 20) -> list[Dict[str, Any]]:
        rows = execute_query(
            """
            SELECT id, event_type, severity, title, source, customer_name, payload, created_at
            FROM mission_events
            ORDER BY created_at DESC
            LIMIT %s
            """,
            (limit,),
        )
        return rows or []

    @staticmethod
    def get_state() -> Dict[str, Any]:
        return {
            "kpis": MissionService.get_kpis(),
            "active_calls": MissionService.get_active_calls(),
            "employee_deadlines": MissionService.get_employee_deadlines(),
            "active_alerts": MissionService.get_active_alerts(),
            "live_feed": MissionService.get_live_feed(20),
            "config": {
                "display_queues": MissionService.parse_json_setting("mission_display_queues", []),
                "sound_enabled": str(MissionService.get_setting_value("mission_sound_enabled", "true")).lower() == "true",
                "sound_volume": int(MissionService.get_setting_value("mission_sound_volume", "70") or 70),
                "sound_events": MissionService.parse_json_setting("mission_sound_events", ["incoming_call", "uptime_down", "critical_event"]),
                "kpi_visible": MissionService.parse_json_setting(
                    "mission_kpi_visible",
                    ["open_cases", "new_cases", "unassigned_cases", "deadlines_today", "overdue_deadlines"],
                ),
                "customer_filter": MissionService.get_setting_value("mission_customer_filter", "") or "",
            },
        }