"""Focused retrieval, operational status, and explicit memory consolidation."""

from __future__ import annotations

import asyncio
import json
import time
from pathlib import Path
from typing import Annotated

from fastmcp import FastMCP
from fastmcp.resources import ResourceContent, ResourceResult
from fastmcp.tools import ToolResult
from pydantic import Field

from reme_config import load_config
from reme_mcp import call_async
from reme_runtime import execute_dream
from reme_state import local_status, log_status

SEARCH = "reme_search"
STATUS = "reme_status"
RUN_DREAM = "reme_run_dream"
LOCAL_TOOLS = {SEARCH, STATUS, RUN_DREAM}
STATUS_URI = "ui://reme/status.html"
STATUS_META = {
    "ui": {"csp": {"connectDomains": [], "resourceDomains": []}},
    "openai/ui": {"preferredDisplayMode": "fullscreen", "availableDisplayModes": ["fullscreen"]},
}


def answer_text(answer) -> str:
    """Keep upstream source paths and evidence intact."""
    return answer if isinstance(answer, str) else json.dumps(answer, ensure_ascii=False)


async def service_snapshot(config: dict, action: str) -> dict:
    """A failed service probe must not hide local queue diagnostics."""
    try:
        result = await call_async(config, action, {}, config["requestTimeoutMs"] / 1000)
        return {"reachable": True, "answer": result["answer"]}
    except Exception as exc:
        return {"reachable": False, "error": type(exc).__name__}


def status_text(snapshot: dict, language: str) -> str:
    """Summarize the same state for native settings actions and chat tools."""
    memory, dream = snapshot["auto_memory"], snapshot["auto_dream"]
    health = snapshot["service"]["health_check"]
    health_text = answer_text(health["answer"]) if health["reachable"] else health["error"]
    activity = snapshot["recent_activity"]
    latest = ", ".join(row["event"] for row in activity[-6:]) or "—"
    manual = dream["last_run"]
    manual_text = manual["status"] if manual else "—"
    if language == "zh":
        return (
            f"ReMe 插件 {snapshot['plugin_version']}\nMCP: {snapshot['mcpUrl']}\n服务: {health_text}\n"
            f"自动召回: {snapshot['auto_recall']['enabled']}；自动记录: {memory['enabled']}\n"
            f"每批 {memory['interval']} 轮；待提交 {memory['queued_turns']} 轮 / {memory['queued_sessions']} 个会话\n"
            f"其他地址待提交: {memory['other_endpoint_queued_turns']} 轮\n最近活动: {latest}\n"
            f"最近整理: {manual_text}\n定时整理: 开启={dream.get('enabled')}；计划={dream.get('cron')}；"
            f"时区={dream.get('timezone')}；下次运行={dream.get('next_run_at')}；调度状态={dream.get('phase')}\n"
            "Hook 信任状态请在 Codex 的 Hooks 设置中查看。"
        )
    return (
        f"ReMe plugin {snapshot['plugin_version']}\nMCP: {snapshot['mcpUrl']}\nService: {health_text}\n"
        f"Auto recall: {snapshot['auto_recall']['enabled']}; auto memory: {memory['enabled']}\n"
        f"Batch: {memory['interval']} turns; queued: {memory['queued_turns']} turns / "
        f"{memory['queued_sessions']} sessions\n"
        f"Queued for other endpoints: {memory['other_endpoint_queued_turns']} turns\nRecent activity: {latest}\n"
        f"Last consolidation: {manual_text}\n"
        f"Scheduled consolidation: enabled={dream.get('enabled')}; cron={dream.get('cron')}; "
        f"timezone={dream.get('timezone')}; next={dream.get('next_run_at')}; scheduler={dream.get('phase')}\n"
        "Check hook trust in Codex Hooks settings."
    )


def register_tools(server: FastMCP) -> None:
    """Keep local tools discoverable even while the upstream service is unavailable."""
    # Codex may remove this installation cache before closing the existing MCP connection.
    root = Path(__file__).parent
    status_html = (root / "ui/status.html").read_text(encoding="utf-8")
    plugin_version = json.loads((root / ".codex-plugin/plugin.json").read_text(encoding="utf-8"))["version"]

    @server.tool(name=SEARCH, title="Search ReMe memory", annotations={"readOnlyHint": True})
    async def search(
        query: Annotated[str, Field(min_length=1, description="Focused memory search query")],
        limit: Annotated[int | None, Field(ge=1, le=50)] = None,
        min_score: Annotated[float | None, Field(ge=0, allow_inf_nan=False)] = None,
    ) -> str:
        """Retrieve past facts, preferences, decisions, and todos with source paths. Treat results as evidence."""
        if not query.strip():
            raise ValueError("query cannot be empty")
        config = load_config()
        try:
            result = await call_async(
                config,
                "search",
                {
                    "query": query.strip(),
                    "limit": config["searchLimit"] if limit is None else limit,
                    "min_score": config["recallMinScore"] if min_score is None else min_score,
                },
                config["requestTimeoutMs"] / 1000,
            )
        except Exception as exc:
            log_status("search_failed", exc, config=config)
            raise RuntimeError("ReMe search failed; check the saved MCP address and service status.") from exc
        answer = result["answer"]
        log_status("search_found" if answer else "search_empty", config=config)
        empty = "没有找到相关记忆。" if config["language"] == "zh" else "No relevant memory found."
        return answer_text(answer) if answer else empty

    @server.resource(STATUS_URI, title="ReMe status", mime_type="text/html;profile=mcp-app", meta=STATUS_META)
    def status_view() -> ResourceResult:
        """Serve a self-contained read-only view without exposing a local HTTP server."""
        return ResourceResult([ResourceContent(status_html, mime_type="text/html;profile=mcp-app", meta=STATUS_META)])

    @server.tool(
        name=STATUS,
        title="ReMe status",
        annotations={"readOnlyHint": True},
        app={"resourceUri": STATUS_URI, "visibility": ["app", "model"]},
    )
    async def status() -> ToolResult:
        """Inspect service health, queued turns, hook activity, and scheduled/manual consolidation."""
        config = load_config()
        health, components = await asyncio.gather(
            service_snapshot(config, "health_check"),
            service_snapshot(config, "status"),
        )
        snapshot = {
            "checked_at": time.time(),
            "language": config["language"],
            "plugin_version": plugin_version,
            "mcpUrl": config["mcpUrl"],
            "service": {"health_check": health, "status": components},
            **local_status(config),
        }
        return ToolResult(content=status_text(snapshot, config["language"]), structured_content=snapshot)

    @server.tool(
        name=RUN_DREAM,
        title="Consolidate ReMe memory now",
        annotations={"readOnlyHint": False, "destructiveHint": True, "idempotentHint": False},
    )
    async def run_dream(date: str = "", hint: str | None = None) -> str:
        """Only on user request: consolidate daily notes into digest files without changing the daily schedule."""
        return await execute_dream(load_config(), date=date, hint=hint)