from __future__ import annotations

from typing import Any

from pydantic import BaseModel, Field, model_validator


class NextcloudTalkRoomConfig(BaseModel):
    enabled: bool = Field(default=True, description="Enable bot responses in this room")
    system_prompt: str | None = Field(
        default=None, alias="systemPrompt", description="Override system prompt for this room"
    )
    require_mention: bool = Field(
        default=True, alias="requireMention", description="Only respond when bot is @mentioned"
    )
    allow_from: list[str] = Field(
        default_factory=list, alias="allowFrom", description="Allowlist of user IDs for this room"
    )
    skills: list[str] = Field(default_factory=list, description="Skills filter for this room")
    history_limit: int = Field(
        default=0, alias="historyLimit", description="Max history messages to load (0=unlimited)"
    )

    model_config = {"populate_by_name": True, "extra": "allow"}


class NextcloudTalkDMConfig(BaseModel):
    enabled: bool = Field(default=True, description="Enable bot responses in this DM")
    system_prompt: str | None = Field(
        default=None, alias="systemPrompt", description="Override system prompt for this DM"
    )
    allow_from: list[str] = Field(
        default_factory=list, alias="allowFrom", description="Allowlist of user IDs for this DM"
    )
    skills: list[str] = Field(default_factory=list, description="Skills filter for this DM")
    history_limit: int = Field(
        default=0, alias="historyLimit", description="Max history messages to load (0=unlimited)"
    )

    model_config = {"populate_by_name": True, "extra": "allow"}


class NextcloudTalkWebhookConfig(BaseModel):
    enabled: bool = Field(default=False, description="Enable standalone webhook server")
    port: int = Field(default=8788, description="Webhook server listen port")
    host: str = Field(default="0.0.0.0", description="Webhook server bind address")
    path: str = Field(default="/nextcloud-talk-webhook", description="Webhook endpoint path")
    rate_limit_max_requests: int = Field(
        default=10,
        alias="rateLimitMaxRequests",
        description="Max failed auth attempts in window",
    )
    rate_limit_window_s: int = Field(
        default=60,
        alias="rateLimitWindowS",
        description="Rate limiting window in seconds",
    )
    rate_limit_lockout_s: int = Field(
        default=300,
        alias="rateLimitLockoutS",
        description="Lockout duration after exceeding rate limit",
    )
    max_body_size: int = Field(
        default=1 * 1024 * 1024,
        alias="maxBodySize",
        description="Maximum webhook request body size in bytes (default: 1MB)",
    )
    pre_auth_max_body_size: int = Field(
        default=64 * 1024,
        alias="preAuthMaxBodySize",
        description="Maximum body size before HMAC auth verification (default: 64KB)",
    )

    model_config = {"populate_by_name": True, "extra": "allow"}


class NextcloudTalkAccountConfig(BaseModel):
    server_url: str = Field(default="", alias="serverUrl", description="Nextcloud server base URL (https://...)")
    bot_user: str = Field(default="", alias="botUser", description="Bot username for authentication")
    app_password: str = Field(
        default="",
        alias="appPassword",
        description="App password or device-specific password",
    )
    display_name: str = Field(
        default="ForcePilot Bot",
        alias="displayName",
        description="Bot display name shown in chats",
    )
    dm_policy: str = Field(
        default="pairing",
        alias="dmPolicy",
        description="DM policy: open|pairing|allowlist|disabled",
    )
    group_policy: str = Field(
        default="allowlist",
        alias="groupPolicy",
        description="Group chat policy: open|allowlist|disabled",
    )
    try_websocket: bool = Field(default=True, alias="tryWebsocket", description="Attempt WebSocket monitor mode")
    reaction_level: str = Field(
        default="minimal",
        alias="reactionLevel",
        description="Reaction verbosity: minimal|normal|verbose",
    )
    poll_interval: float = Field(default=0.5, description="Polling interval in seconds")
    poll_timeout: int = Field(default=30, description="Polling long-poll timeout in seconds")
    allow_from: list[str] = Field(default_factory=list, alias="allowFrom", description="Global allowlist of user IDs")
    group_allow_from: list[str] = Field(
        default_factory=list, alias="groupAllowFrom", description="Global group allowlist"
    )
    rooms: dict[str, NextcloudTalkRoomConfig] = Field(
        default_factory=dict,
        description="Per-room configuration overrides, keyed by room token",
    )
    dms: dict[str, NextcloudTalkDMConfig] = Field(
        default_factory=dict,
        description="Per-user DM config overrides, keyed by user ID",
    )
    groups: dict[str, Any] = Field(default_factory=dict, description="Group policy details")
    accounts: dict[str, Any] = Field(default_factory=dict, alias="accounts", description="Multi-account configurations")
    retry: dict[str, int] = Field(
        default_factory=lambda: {"attempts": 3, "min_delay_ms": 400, "max_delay_ms": 30000},
        description="Send retry policy: attempts, min/max delay",
    )
    history_limit: int = Field(default=0, alias="historyLimit", description="Global history limit for group chats")
    dm_history_limit: int = Field(default=0, alias="dmHistoryLimit", description="Global history limit for DMs")
    markdown: dict[str, Any] = Field(default_factory=dict, description="Markdown rendering options")
    block_streaming_coalesce: dict[str, Any] = Field(
        default_factory=dict,
        alias="blockStreamingCoalesce",
        description="Block streaming coalesce config (min_chars, max_delay_ms)",
    )
    response_prefix: str = Field(
        default="",
        alias="responsePrefix",
        description="Text prepended to every bot response",
    )
    silent: bool = Field(default=False, description="Send messages with silent flag")
    chunk_mode: str = Field(
        default="split",
        alias="chunkMode",
        description="Chunking strategy: split|stop|truncate",
    )
    media_max_mb: int = Field(default=20, alias="mediaMaxMb", description="Max media file size in MB")
    webhook: NextcloudTalkWebhookConfig = Field(
        default_factory=NextcloudTalkWebhookConfig,
        description="Standalone webhook server configuration",
    )
    dangerously_allow_private_network: bool = Field(
        default=False,
        alias="dangerouslyAllowPrivateNetwork",
        description="Allow connections to private/reserved IPs (SSRF risk)",
    )
    network: dict[str, Any] = Field(default_factory=dict, description="Network config: proxy, etc.")

    model_config = {"populate_by_name": True, "extra": "allow"}

    @model_validator(mode="after")
    def validate_server_url(self) -> NextcloudTalkAccountConfig:
        if self.server_url and not (self.server_url.startswith("https://") or self.server_url.startswith("http://")):
            raise ValueError(f"server_url must start with https:// or http://, got: {self.server_url}")
        return self

    @model_validator(mode="after")
    def validate_dm_policy(self) -> NextcloudTalkAccountConfig:
        valid = {"open", "pairing", "allowlist", "disabled"}
        if self.dm_policy not in valid:
            raise ValueError(f"dm_policy must be one of {sorted(valid)}, got: {self.dm_policy}")
        return self

    @model_validator(mode="after")
    def validate_group_policy(self) -> NextcloudTalkAccountConfig:
        valid = {"open", "allowlist", "disabled"}
        if self.group_policy not in valid:
            raise ValueError(f"group_policy must be one of {sorted(valid)}, got: {self.group_policy}")
        return self

    @model_validator(mode="after")
    def validate_chunk_mode(self) -> NextcloudTalkAccountConfig:
        valid = {"split", "stop", "truncate"}
        if self.chunk_mode not in valid:
            raise ValueError(f"chunk_mode must be one of {sorted(valid)}, got: {self.chunk_mode}")
        return self


def validate_config(config: dict[str, Any]) -> NextcloudTalkAccountConfig:
    return NextcloudTalkAccountConfig.model_validate(config)