from __future__ import annotations

MATTERMOST_CONFIG_SCHEMA = {
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "title": "Mattermost Channel Configuration",
    "properties": {
        "server_url": {
            "type": "string",
            "format": "uri",
            "description": "Mattermost 服务器 URL",
            "examples": ["https://mattermost.example.com"],
        },
        "bot_token": {
            "type": "string",
            "description": "Bot Personal Access Token",
            "writeOnly": True,
        },
        "dm_policy": {
            "type": "string",
            "enum": ["open", "allowlist", "pairing", "disabled"],
            "default": "open",
            "description": "DM 安全策略",
        },
        "group_policy": {
            "type": "string",
            "enum": ["open", "allowlist", "disabled"],
            "default": "open",
            "description": "群组安全策略",
        },
        "allow_from": {
            "type": "array",
            "items": {"type": "string"},
            "description": "DM 白名单（用户 ID 或 @username）",
        },
        "group_allow_from": {
            "type": "array",
            "items": {"type": "string"},
            "description": "群组白名单",
        },
        "chatmode": {
            "type": "string",
            "enum": ["oncall", "onmessage", "onchar"],
            "default": "onmessage",
            "description": "消息响应模式",
        },
        "require_mention": {
            "type": "boolean",
            "default": True,
            "description": "群组消息是否需要 @提及",
        },
        "onchar_prefixes": {
            "type": "array",
            "items": {"type": "string"},
            "default": [">", "!"],
            "description": "onchar 模式触发前缀",
        },
        "reply_to_mode": {
            "type": "string",
            "enum": ["off", "first", "all", "batched"],
            "default": "off",
            "description": "回复线程绑定模式",
        },
        "text_chunk_limit": {
            "type": "integer",
            "minimum": 1000,
            "maximum": 16383,
            "default": 4000,
            "description": "消息分块大小上限",
        },
        "media_filename": {
            "type": "string",
            "default": "file",
            "description": "媒体文件默认文件名",
        },
        "max_media_size_mb": {
            "type": "integer",
            "minimum": 1,
            "maximum": 100,
            "default": 100,
            "description": "最大媒体文件大小 (MB)",
        },
        "dangerously_allow_name_matching": {
            "type": "boolean",
            "default": False,
            "description": "允许白名单名称匹配（安全风险）",
        },
        "auto_register_commands": {
            "type": "boolean",
            "default": False,
            "description": "自动注册 Slash Commands",
        },
        "commands": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "command": {"type": "string"},
                    "description": {"type": "string"},
                },
            },
            "description": "自定义 Slash Commands",
        },
        "silence_send": {
            "type": "boolean",
            "default": False,
            "description": "静默发送模式 — 发送 message 时不连带任何 props/attachments",
        },
        "block_streaming": {
            "type": "boolean",
            "default": True,
            "description": "启用/禁用块流式输出",
        },
        "stream_min_chars": {
            "type": "integer",
            "minimum": 1,
            "maximum": 16383,
            "default": 50,
            "description": "partial/block 流式模式下缓冲区最小字符数，达到后刷新",
        },
        "stream_idle_ms": {
            "type": "integer",
            "minimum": 100,
            "maximum": 30000,
            "default": 1000,
            "description": "partial/block 流式模式下最大空闲等待 (ms)，超时后刷新缓冲",
        },
        "blockStreamingCoalesce": {
            "type": "object",
            "properties": {
                "minChars": {"type": "integer", "default": 1500},
                "idleMs": {"type": "integer", "default": 1000},
            },
            "description": "block 流式合并配置",
        },
        "dmChannelRetry": {
            "type": "object",
            "properties": {
                "baseDelayMs": {"type": "integer", "default": 1000},
                "maxRetries": {"type": "integer", "default": 3},
            },
            "description": "DM 频道创建重试配置",
        },
        "responsePrefix": {
            "type": "string",
            "default": "",
            "description": "所有回复前添加的前缀",
        },
        "network": {
            "type": "object",
            "properties": {
                "dangerouslyAllowPrivateNetwork": {
                    "type": "boolean",
                    "default": False,
                },
            },
            "description": "网络配置",
        },
        "configWrites": {
            "type": "boolean",
            "default": False,
            "description": "允许通过命令写入配置",
        },
        "agent_routes": {
            "type": "object",
            "description": "Per-channel/Per-team Agent 路由配置",
        },
        "default_agent_id": {
            "type": "string",
            "description": "默认 Agent ID",
        },
        "groups": {
            "type": "object",
            "description": "Per-Group 配置，支持 requireMention 覆盖",
            "additionalProperties": {
                "type": "object",
                "properties": {
                    "requireMention": {"type": "boolean"},
                },
            },
        },
    },
    "required": ["server_url", "bot_token"],
    "additionalProperties": True,
}


def validate_config_schema(config: dict) -> list[str]:
    """基于 JSON Schema 验证配置。返回错误列表。"""
    errors = []
    for req in MATTERMOST_CONFIG_SCHEMA.get("required", []):
        if not config.get(req):
            errors.append(f"Missing required field: {req}")

    dm_policy = config.get("dm_policy", "")
    allowed_dm = MATTERMOST_CONFIG_SCHEMA["properties"]["dm_policy"]["enum"]
    if dm_policy and dm_policy not in allowed_dm:
        errors.append(f"dm_policy must be one of {allowed_dm}")

    group_policy = config.get("group_policy", "")
    allowed_gp = MATTERMOST_CONFIG_SCHEMA["properties"]["group_policy"]["enum"]
    if group_policy and group_policy not in allowed_gp:
        errors.append(f"group_policy must be one of {allowed_gp}")

    chatmode = config.get("chatmode", "")
    allowed_cm = MATTERMOST_CONFIG_SCHEMA["properties"]["chatmode"]["enum"]
    if chatmode and chatmode not in allowed_cm:
        errors.append(f"chatmode must be one of {allowed_cm}")

    text_chunk_limit = config.get("text_chunk_limit", 0)
    if text_chunk_limit and (text_chunk_limit < 1000 or text_chunk_limit > 16383):
        errors.append("text_chunk_limit must be between 1000 and 16383")

    return errors


def get_config_schema() -> dict:
    """返回配置 JSON Schema。"""
    return MATTERMOST_CONFIG_SCHEMA