"""市場情報內部 MCP tool contract preview。

這裡只定義 market_intel 可使用的 read-only MCP 能力與白名單檢查；
不呼叫 MCP server、不寫 DB、不掛排程。
"""

EXPECTED_MARKET_INTEL_TOOLS = (
    "market_campaign_search",
    "market_campaign_scrape",
    "market_product_match_lookup",
)


MARKET_INTEL_MCP_TOOL_CONTRACT = (
    {
        "name": "market_campaign_search",
        "server": "omnisearch",
        "router_tools": ("tavily_search", "exa_search"),
        "purpose": "搜尋公開活動檔期入口與平台促銷資訊，僅產生候選來源。",
        "read_only": True,
        "database_write_allowed": False,
        "scheduler_attach_allowed": False,
        "external_network_required": True,
    },
    {
        "name": "market_campaign_scrape",
        "server": "firecrawl",
        "router_tools": ("scrape_url",),
        "purpose": "抓取人工批准的公開活動頁內容，供 parser diagnostics 使用。",
        "read_only": True,
        "database_write_allowed": False,
        "scheduler_attach_allowed": False,
        "external_network_required": True,
    },
    {
        "name": "market_product_match_lookup",
        "server": "postgres",
        "router_tools": ("query",),
        "purpose": "只讀查詢既有商品、比價與 market_* 表，輔助商品比對審核。",
        "read_only": True,
        "database_write_allowed": False,
        "scheduler_attach_allowed": False,
        "external_network_required": False,
    },
)


def get_market_intel_mcp_tool_contract():
    """回傳可序列化的 market_intel MCP tool contract。"""
    return [
        {
            **item,
            "router_tools": list(item["router_tools"]),
        }
        for item in MARKET_INTEL_MCP_TOOL_CONTRACT
    ]


def build_mcp_tool_contract_preview(tool_registry=None):
    """檢查 market_intel MCP contract 是否已被 router 白名單覆蓋。"""
    if tool_registry is None:
        from services.mcp_router import TOOL_REGISTRY

        tool_registry = TOOL_REGISTRY

    registered = tool_registry.get("market_intel", {})
    tool_statuses = []
    for item in get_market_intel_mcp_tool_contract():
        registered_tools = set(registered.get(item["server"], []))
        expected_tools = set(item["router_tools"])
        missing_tools = sorted(expected_tools - registered_tools)
        tool_statuses.append(
            {
                **item,
                "registered_router_tools": sorted(registered_tools),
                "missing_router_tools": missing_tools,
                "router_tools_whitelisted": not missing_tools,
                "write_risk": bool(
                    not item["read_only"]
                    or item["database_write_allowed"]
                    or item["scheduler_attach_allowed"]
                ),
            }
        )

    checks = {
        "market_intel_caller_registered": "market_intel" in tool_registry,
        "expected_tool_count_matched": len(tool_statuses) == len(EXPECTED_MARKET_INTEL_TOOLS),
        "all_expected_tool_names_present": {
            item["name"] for item in tool_statuses
        }
        == set(EXPECTED_MARKET_INTEL_TOOLS),
        "all_router_tools_whitelisted": all(
            item["router_tools_whitelisted"]
            for item in tool_statuses
        ),
        "all_tools_read_only": all(item["read_only"] for item in tool_statuses),
        "no_database_write_allowed": all(
            not item["database_write_allowed"]
            for item in tool_statuses
        ),
        "no_scheduler_attach_allowed": all(
            not item["scheduler_attach_allowed"]
            for item in tool_statuses
        ),
    }
    blocked_reasons = [
        key for key, passed in checks.items()
        if not passed
    ]

    return {
        "mode": "mcp_tool_contract_preview",
        "caller": "market_intel",
        "expected_tool_names": list(EXPECTED_MARKET_INTEL_TOOLS),
        "tool_count": len(tool_statuses),
        "tools": tool_statuses,
        "checks": checks,
        "contract_ready": not blocked_reasons,
        "blocked_reasons": blocked_reasons,
        "database_session_created": False,
        "database_write_executed": False,
        "database_commit_executed": False,
        "external_network_executed": False,
        "scheduler_attached": False,
        "writes_executed": False,
        "would_write_database": False,
    }