from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field
from sqlalchemy.orm import Session

from app.auth.jwt_auth import require_admin
from app.database import get_db
from app.services.email_notify import EmailNotConfiguredError, EmailSendError, send_email_test_message
from app.services.notification_policy import (
    NotificationPolicyConfig,
    get_effective_notification_policy,
    upsert_notification_policy,
)
from app.services.notification_settings import (
    VALID_SEVERITIES,
    EmailConfig,
    TelegramConfig,
    WebhookConfig,
    get_effective_email_config,
    get_effective_telegram_config,
    get_effective_webhook_config,
    upsert_email_channel,
    upsert_telegram_channel,
    upsert_webhook_channel,
)
from app.services.telegram_notify import TelegramNotConfiguredError, TelegramSendError, send_telegram_test_message
from app.services.webhook_notify import (
    WebhookNotConfiguredError,
    WebhookSendError,
    send_webhook_test_message,
)
from app.services.event_severity_overrides import (
    SOURCE_DB,
    list_severity_override_items,
    replace_severity_overrides,
)
from app.services.ui_settings import (
    get_effective_ui_settings,
    upsert_ui_settings,
)
from app.services.linux_admin_settings import (
    get_effective_linux_admin_config,
    upsert_linux_admin_settings,
)
from app.services.win_admin_settings import (
    get_effective_win_admin_config,
    upsert_win_admin_settings,
)
from app.services.agent_update_settings import (
    get_effective_agent_update_config,
    upsert_agent_update_settings,
)
from app.services.winrm_connect import (
    HostNotWindowsError,
    HostTargetMissingError,
    WinAdminNotConfiguredError,
    resolve_windows_host_target,
    test_winrm_connection,
)

router = APIRouter(prefix="/settings", tags=["settings"])


def _mask_secret(value: str, *, visible_tail: int = 4) -> str | None:
    text = value.strip()
    if not text:
        return None
    if len(text) <= visible_tail:
        return "*" * len(text)
    return f"{'*' * 8}…{text[-visible_tail:]}"


def _mask_url(value: str) -> str | None:
    text = value.strip()
    if not text:
        return None
    if len(text) <= 20:
        return f"{'*' * 6}…{text[-4:]}"
    return f"{text[:16]}…{text[-6:]}"


class TelegramSettingsResponse(BaseModel):
    enabled: bool
    configured: bool
    chat_id_hint: str | None = None
    bot_token_hint: str | None = None
    min_severity: str
    source: str = Field(description="env или db")


class WebhookSettingsResponse(BaseModel):
    enabled: bool
    configured: bool
    url_hint: str | None = None
    secret_header: str | None = None
    secret_hint: str | None = None
    min_severity: str
    source: str = Field(description="env или db")


class EmailSettingsResponse(BaseModel):
    enabled: bool
    configured: bool
    smtp_host_hint: str | None = None
    smtp_port: int
    smtp_user: str | None = None
    smtp_password_hint: str | None = None
    mail_from: str | None = None
    mail_to_hint: str | None = None
    smtp_starttls: bool
    smtp_ssl: bool
    min_severity: str
    source: str = Field(description="env или db")


class NotificationPolicyResponse(BaseModel):
    min_severity: str
    use_telegram: bool
    use_webhook: bool
    use_email: bool
    use_mobile: bool
    source: str = Field(description="env или db")


class NotificationSettingsResponse(BaseModel):
    policy: NotificationPolicyResponse
    telegram: TelegramSettingsResponse
    webhook: WebhookSettingsResponse
    email: EmailSettingsResponse


class NotificationPolicyUpdate(BaseModel):
    min_severity: str
    use_telegram: bool
    use_webhook: bool
    use_email: bool
    use_mobile: bool = False


class TelegramSettingsUpdate(BaseModel):
    enabled: bool
    bot_token: str | None = None
    chat_id: str | None = None


class WebhookSettingsUpdate(BaseModel):
    enabled: bool
    url: str | None = None
    secret_header: str | None = None
    secret: str | None = None


class EmailSettingsUpdate(BaseModel):
    enabled: bool
    smtp_host: str | None = None
    smtp_port: int | None = None
    smtp_user: str | None = None
    smtp_password: str | None = None
    mail_from: str | None = None
    mail_to: str | None = None
    smtp_starttls: bool | None = None
    smtp_ssl: bool | None = None


class ChannelTestResponse(BaseModel):
    ok: bool = True
    message: str


def _policy_to_response(cfg: NotificationPolicyConfig) -> NotificationPolicyResponse:
    return NotificationPolicyResponse(
        min_severity=cfg.min_severity,
        use_telegram=cfg.use_telegram,
        use_webhook=cfg.use_webhook,
        use_email=cfg.use_email,
        use_mobile=cfg.use_mobile,
        source=cfg.source,
    )


def _telegram_to_response(cfg: TelegramConfig, policy: NotificationPolicyConfig) -> TelegramSettingsResponse:
    return TelegramSettingsResponse(
        enabled=cfg.enabled,
        configured=cfg.configured,
        chat_id_hint=_mask_secret(cfg.chat_id),
        bot_token_hint=_mask_secret(cfg.bot_token),
        min_severity=policy.min_severity,
        source=cfg.source,
    )


def _webhook_to_response(cfg: WebhookConfig, policy: NotificationPolicyConfig) -> WebhookSettingsResponse:
    return WebhookSettingsResponse(
        enabled=cfg.enabled,
        configured=cfg.configured,
        url_hint=_mask_url(cfg.url),
        secret_header=cfg.secret_header or None,
        secret_hint=_mask_secret(cfg.secret),
        min_severity=policy.min_severity,
        source=cfg.source,
    )


def _email_to_response(cfg: EmailConfig, policy: NotificationPolicyConfig) -> EmailSettingsResponse:
    return EmailSettingsResponse(
        enabled=cfg.enabled,
        configured=cfg.configured,
        smtp_host_hint=_mask_url(cfg.smtp_host) if cfg.smtp_host else None,
        smtp_port=cfg.smtp_port,
        smtp_user=cfg.smtp_user or None,
        smtp_password_hint=_mask_secret(cfg.smtp_password),
        mail_from=cfg.mail_from or None,
        mail_to_hint=_mask_secret(cfg.mail_to.replace(";", ",")) if cfg.mail_to else None,
        smtp_starttls=cfg.smtp_starttls,
        smtp_ssl=cfg.smtp_ssl,
        min_severity=policy.min_severity,
        source=cfg.source,
    )


@router.get("/notifications", response_model=NotificationSettingsResponse)
def get_notification_settings(
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> NotificationSettingsResponse:
    policy = get_effective_notification_policy(db)
    return NotificationSettingsResponse(
        policy=_policy_to_response(policy),
        telegram=_telegram_to_response(get_effective_telegram_config(db), policy),
        webhook=_webhook_to_response(get_effective_webhook_config(db), policy),
        email=_email_to_response(get_effective_email_config(db), policy),
    )


@router.put("/notifications/policy", response_model=NotificationPolicyResponse)
def update_notification_policy(
    body: NotificationPolicyUpdate,
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> NotificationPolicyResponse:
    if body.min_severity not in VALID_SEVERITIES:
        raise HTTPException(status_code=422, detail=f"min_severity must be one of: {sorted(VALID_SEVERITIES)}")
    if not any((body.use_telegram, body.use_webhook, body.use_email, body.use_mobile)):
        raise HTTPException(status_code=422, detail="Выберите хотя бы один канал")
    try:
        policy = upsert_notification_policy(
            db,
            min_severity=body.min_severity,
            use_telegram=body.use_telegram,
            use_webhook=body.use_webhook,
            use_email=body.use_email,
            use_mobile=body.use_mobile,
        )
    except ValueError as exc:
        raise HTTPException(status_code=422, detail=str(exc)) from exc
    return _policy_to_response(policy)


@router.put("/notifications/telegram", response_model=TelegramSettingsResponse)
def update_telegram_settings(
    body: TelegramSettingsUpdate,
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> TelegramSettingsResponse:
    try:
        cfg = upsert_telegram_channel(
            db,
            enabled=body.enabled,
            bot_token=body.bot_token,
            chat_id=body.chat_id,
        )
    except ValueError as exc:
        raise HTTPException(status_code=422, detail=str(exc)) from exc
    policy = get_effective_notification_policy(db)
    return _telegram_to_response(cfg, policy)


@router.put("/notifications/webhook", response_model=WebhookSettingsResponse)
def update_webhook_settings(
    body: WebhookSettingsUpdate,
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> WebhookSettingsResponse:
    try:
        cfg = upsert_webhook_channel(
            db,
            enabled=body.enabled,
            url=body.url,
            secret_header=body.secret_header,
            secret=body.secret,
        )
    except ValueError as exc:
        raise HTTPException(status_code=422, detail=str(exc)) from exc
    policy = get_effective_notification_policy(db)
    return _webhook_to_response(cfg, policy)


@router.put("/notifications/email", response_model=EmailSettingsResponse)
def update_email_settings(
    body: EmailSettingsUpdate,
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> EmailSettingsResponse:
    try:
        cfg = upsert_email_channel(
            db,
            enabled=body.enabled,
            smtp_host=body.smtp_host,
            smtp_port=body.smtp_port,
            smtp_user=body.smtp_user,
            smtp_password=body.smtp_password,
            mail_from=body.mail_from,
            mail_to=body.mail_to,
            smtp_starttls=body.smtp_starttls,
            smtp_ssl=body.smtp_ssl,
        )
    except ValueError as exc:
        raise HTTPException(status_code=422, detail=str(exc)) from exc
    policy = get_effective_notification_policy(db)
    return _email_to_response(cfg, policy)


@router.post("/notifications/telegram/test", response_model=ChannelTestResponse)
def test_telegram_settings(
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> ChannelTestResponse:
    cfg = get_effective_telegram_config(db)
    try:
        send_telegram_test_message(config=cfg)
    except TelegramNotConfiguredError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    except TelegramSendError as exc:
        code = exc.status_code if exc.status_code and 400 <= exc.status_code < 500 else 502
        raise HTTPException(status_code=code, detail=str(exc)) from exc
    return ChannelTestResponse(message="Тестовое сообщение отправлено в Telegram")


@router.post("/notifications/webhook/test", response_model=ChannelTestResponse)
def test_webhook_settings(
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> ChannelTestResponse:
    cfg = get_effective_webhook_config(db)
    try:
        send_webhook_test_message(config=cfg)
    except WebhookNotConfiguredError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    except WebhookSendError as exc:
        code = exc.status_code if exc.status_code and 400 <= exc.status_code < 500 else 502
        raise HTTPException(status_code=code, detail=str(exc)) from exc
    return ChannelTestResponse(message="Тестовый POST отправлен на webhook URL")


@router.post("/notifications/email/test", response_model=ChannelTestResponse)
def test_email_settings(
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> ChannelTestResponse:
    cfg = get_effective_email_config(db)
    try:
        send_email_test_message(config=cfg)
    except EmailNotConfiguredError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    except EmailSendError as exc:
        raise HTTPException(status_code=502, detail=str(exc)) from exc
    return ChannelTestResponse(message="Тестовое письмо отправлено по SMTP")


class EventSeverityOverrideRow(BaseModel):
    event_type: str
    default_severity: str
    override_severity: str | None = None


class EventSeverityOverridesResponse(BaseModel):
    items: list[EventSeverityOverrideRow]
    source: str = Field(description="db — overrides хранятся в PostgreSQL")


class EventSeverityOverridesUpdate(BaseModel):
    overrides: dict[str, str | None] = Field(
        description="event_type → severity; null или пустая строка сбрасывает override",
    )


@router.get("/notifications/severity-overrides", response_model=EventSeverityOverridesResponse)
def get_severity_overrides(
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> EventSeverityOverridesResponse:
    items = list_severity_override_items(db)
    return EventSeverityOverridesResponse(
        items=[
            EventSeverityOverrideRow(
                event_type=i.event_type,
                default_severity=i.default_severity,
                override_severity=i.override_severity,
            )
            for i in items
        ],
        source=SOURCE_DB,
    )


@router.put("/notifications/severity-overrides", response_model=EventSeverityOverridesResponse)
def update_severity_overrides(
    body: EventSeverityOverridesUpdate,
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> EventSeverityOverridesResponse:
    try:
        items = replace_severity_overrides(db, body.overrides)
        db.commit()
    except ValueError as exc:
        raise HTTPException(status_code=422, detail=str(exc)) from exc
    return EventSeverityOverridesResponse(
        items=[
            EventSeverityOverrideRow(
                event_type=i.event_type,
                default_severity=i.default_severity,
                override_severity=i.override_severity,
            )
            for i in items
        ],
        source=SOURCE_DB,
    )


class UiSettingsResponse(BaseModel):
    show_sidebar_system_stats: bool
    source: str = Field(description="db или default")


class UiSettingsUpdate(BaseModel):
    show_sidebar_system_stats: bool


@router.get("/ui", response_model=UiSettingsResponse)
def get_ui_settings(
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> UiSettingsResponse:
    cfg = get_effective_ui_settings(db)
    return UiSettingsResponse(
        show_sidebar_system_stats=cfg.show_sidebar_system_stats,
        source=cfg.source,
    )


@router.put("/ui", response_model=UiSettingsResponse)
def update_ui_settings(
    body: UiSettingsUpdate,
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> UiSettingsResponse:
    cfg = upsert_ui_settings(db, show_sidebar_system_stats=body.show_sidebar_system_stats)
    return UiSettingsResponse(
        show_sidebar_system_stats=cfg.show_sidebar_system_stats,
        source=cfg.source,
    )


class WinAdminSettingsResponse(BaseModel):
    configured: bool
    user: str | None = None
    password_hint: str | None = None
    source: str = Field(description="env или db")


class WinAdminSettingsUpdate(BaseModel):
    user: str | None = None
    password: str | None = None


@router.get("/win-admin", response_model=WinAdminSettingsResponse)
def get_win_admin_settings(
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> WinAdminSettingsResponse:
    cfg = get_effective_win_admin_config(db)
    return WinAdminSettingsResponse(
        configured=cfg.configured,
        user=cfg.user or None,
        password_hint=_mask_secret(cfg.password),
        source=cfg.source,
    )


@router.put("/win-admin", response_model=WinAdminSettingsResponse)
def update_win_admin_settings(
    body: WinAdminSettingsUpdate,
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> WinAdminSettingsResponse:
    if body.user is not None and not body.user.strip():
        raise HTTPException(status_code=422, detail="user must not be empty")
    cfg = upsert_win_admin_settings(db, user=body.user, password=body.password)
    return WinAdminSettingsResponse(
        configured=cfg.configured,
        user=cfg.user or None,
        password_hint=_mask_secret(cfg.password),
        source=cfg.source,
    )


class LinuxAdminSettingsResponse(BaseModel):
    configured: bool
    user: str | None = None
    password_hint: str | None = None
    source: str = Field(description="env или db")


class LinuxAdminSettingsUpdate(BaseModel):
    user: str | None = None
    password: str | None = None


@router.get("/linux-admin", response_model=LinuxAdminSettingsResponse)
def get_linux_admin_settings(
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> LinuxAdminSettingsResponse:
    cfg = get_effective_linux_admin_config(db)
    return LinuxAdminSettingsResponse(
        configured=cfg.configured,
        user=cfg.user or None,
        password_hint=_mask_secret(cfg.password),
        source=cfg.source,
    )


@router.put("/linux-admin", response_model=LinuxAdminSettingsResponse)
def update_linux_admin_settings(
    body: LinuxAdminSettingsUpdate,
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> LinuxAdminSettingsResponse:
    if body.user is not None and not body.user.strip():
        raise HTTPException(status_code=422, detail="user must not be empty")
    cfg = upsert_linux_admin_settings(db, user=body.user, password=body.password)
    return LinuxAdminSettingsResponse(
        configured=cfg.configured,
        user=cfg.user or None,
        password_hint=_mask_secret(cfg.password),
        source=cfg.source,
    )


class AgentUpdateSettingsResponse(BaseModel):
    mode: str
    fallback_enabled: bool
    fallback_after_minutes: int
    recommended_rdp_version: str | None = None
    recommended_ssh_version: str | None = None
    min_rdp_version: str | None = None
    min_ssh_version: str | None = None
    win_agent_update_script: str | None = None
    source: str = Field(description="env или db")


class AgentUpdateSettingsUpdate(BaseModel):
    mode: str | None = None
    fallback_enabled: bool | None = None
    fallback_after_minutes: int | None = None
    recommended_rdp_version: str | None = None
    recommended_ssh_version: str | None = None
    min_rdp_version: str | None = None
    min_ssh_version: str | None = None
    win_agent_update_script: str | None = None


def _agent_update_to_response(cfg) -> AgentUpdateSettingsResponse:
    return AgentUpdateSettingsResponse(
        mode=cfg.mode,
        fallback_enabled=cfg.fallback_enabled,
        fallback_after_minutes=cfg.fallback_after_minutes,
        recommended_rdp_version=cfg.recommended_rdp_version or None,
        recommended_ssh_version=cfg.recommended_ssh_version or None,
        min_rdp_version=cfg.min_rdp_version or None,
        min_ssh_version=cfg.min_ssh_version or None,
        win_agent_update_script=cfg.win_agent_update_script or None,
        source=cfg.source,
    )


@router.get("/agent-updates", response_model=AgentUpdateSettingsResponse)
def get_agent_update_settings(
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> AgentUpdateSettingsResponse:
    return _agent_update_to_response(get_effective_agent_update_config(db))


@router.put("/agent-updates", response_model=AgentUpdateSettingsResponse)
def update_agent_update_settings(
    body: AgentUpdateSettingsUpdate,
    db: Session = Depends(get_db),
    _user=Depends(require_admin),
) -> AgentUpdateSettingsResponse:
    try:
        cfg = upsert_agent_update_settings(
            db,
            mode=body.mode,
            fallback_enabled=body.fallback_enabled,
            fallback_after_minutes=body.fallback_after_minutes,
            recommended_rdp_version=body.recommended_rdp_version,
            recommended_ssh_version=body.recommended_ssh_version,
            min_rdp_version=body.min_rdp_version,
            min_ssh_version=body.min_ssh_version,
            win_agent_update_script=body.win_agent_update_script,
        )
    except ValueError as exc:
        raise HTTPException(status_code=422, detail=str(exc)) from exc
    return _agent_update_to_response(cfg)