from __future__ import annotations

LINE_CONFIG_SCHEMA = {
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "title": "LINE Channel Configuration",
    "description": "LINE Messaging API channel configuration schema",
    "properties": {
        "name": {
            "type": "string",
            "description": "Channel display name",
            "default": "line",
        },
        "dm_policy": {
            "type": "string",
            "enum": ["open", "allowlist", "pairing", "disabled"],
            "default": "open",
            "description": "Direct message access policy",
        },
        "group_policy": {
            "type": "string",
            "enum": ["open", "allowlist", "disabled"],
            "default": "open",
            "description": "Group access policy",
        },
        "allow_from": {
            "type": "array",
            "items": {"type": "string"},
            "description": "DM allowlist (LINE user IDs)",
            "default": [],
        },
        "groups": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "id": {
                        "type": "string",
                        "description": "Group/room ID or '*' for default",
                    },
                    "enabled": {
                        "type": "boolean",
                        "default": True,
                    },
                    "require_mention": {
                        "type": "boolean",
                        "default": False,
                    },
                    "auto_thread_id": {
                        "type": "boolean",
                        "default": False,
                    },
                    "system_prompt": {
                        "type": "string",
                        "description": "Group-specific system prompt override",
                    },
                    "skills": {
                        "type": "array",
                        "items": {"type": "string"},
                        "description": "Group-specific enabled skills",
                        "default": [],
                    },
                    "allow_from": {
                        "type": "array",
                        "items": {"type": "string"},
                        "description": "Group-specific user allowlist override",
                    },
                },
                "required": ["id"],
            },
            "default": [],
        },
        "webhook_path": {
            "type": "string",
            "description": "Custom webhook path (per-account)",
            "default": "line/callback",
        },
        "enabled": {
            "type": "boolean",
            "description": "Enable/disable LINE channel",
            "default": True,
        },
        "proxy": {
            "type": "string",
            "description": "HTTP/HTTPS proxy URL for LINE API requests",
        },
        "quickstart_allow_from": {
            "type": "array",
            "items": {"type": "string"},
            "description": "Quick start allowFrom list",
            "default": [],
        },
        "default_account": {
            "type": "string",
            "description": "Default account ID for multi-account setups",
        },
        "response_prefix": {
            "type": "string",
            "description": "Text prefix prepended to every response",
            "default": "",
        },
        "media_max_mb": {
            "type": "integer",
            "description": "Maximum media download size in MB",
            "default": 10,
        },
        "agent_prompt": {
            "type": "string",
            "description": "Custom agent system prompt for LINE channel",
        },
        "token_file": {
            "type": "string",
            "description": "Path to file containing channel access token",
        },
        "secret_file": {
            "type": "string",
            "description": "Path to file containing channel secret",
        },
        "thread_bindings": {
            "type": "object",
            "properties": {
                "enabled": {
                    "type": "boolean",
                    "default": False,
                },
                "idle_hours": {
                    "type": "number",
                    "default": 6,
                    "description": "Hours of inactivity before closing thread binding",
                },
                "max_age_hours": {
                    "type": "number",
                    "default": 72,
                    "description": "Maximum age in hours before thread binding expires",
                },
                "spawn_subagent_sessions": {
                    "type": "boolean",
                    "default": False,
                },
                "spawn_acp_sessions": {
                    "type": "boolean",
                    "default": False,
                },
            },
            "description": "Thread binding configuration",
        },
        "conversation_bindings": {
            "type": "object",
            "properties": {
                "default_top_level_placement": {
                    "type": "string",
                    "enum": ["current", "new", "none"],
                    "default": "current",
                },
            },
            "description": "Conversation binding configuration",
        },
        "accounts": {
            "type": "object",
            "properties": {
                "default": {
                    "type": "object",
                    "properties": {
                        "channel_access_token": {"type": "string"},
                        "channel_secret": {"type": "string"},
                        "token_file": {"type": "string"},
                        "secret_file": {"type": "string"},
                    },
                },
            },
            "patternProperties": {
                "^[a-zA-Z0-9_]+$": {
                    "type": "object",
                    "properties": {
                        "channel_access_token": {"type": "string"},
                        "channel_secret": {"type": "string"},
                        "token_file": {"type": "string"},
                        "secret_file": {"type": "string"},
                    },
                },
            },
            "description": "LINE account configurations",
        },
    },
    "required": ["accounts"],
}


def validate_line_config(config: dict) -> tuple[bool, str | None]:
    try:
        import jsonschema

        jsonschema.validate(instance=config, schema=LINE_CONFIG_SCHEMA)
        return True, None
    except ImportError:
        return _manual_validate(config)
    except jsonschema.ValidationError as e:
        return False, str(e)


def _manual_validate(config: dict) -> tuple[bool, str | None]:
    if not isinstance(config, dict):
        return False, "Config must be a dict"
    if "accounts" not in config:
        return False, "Missing required field: accounts"
    accounts = config.get("accounts", {})
    if not isinstance(accounts, dict):
        return False, "accounts must be a dict"
    default = accounts.get("default", {})
    if not default.get("channel_access_token") and not default.get("channel_secret"):
        return False, "accounts.default requires channel_access_token or channel_secret"
    dm_policy = config.get("dm_policy", "open")
    if dm_policy not in ("open", "allowlist", "pairing", "disabled"):
        return False, f"Invalid dm_policy: {dm_policy}"
    group_policy = config.get("group_policy", "open")
    if group_policy not in ("open", "allowlist", "disabled"):
        return False, f"Invalid group_policy: {group_policy}"
    return True, None