import re
from typing import Any

from fastapi import HTTPException
from sqlalchemy.orm import Session

from app.application.feishu.delivery import send_text_if_configured
from app.application.feishu.results import command_result
from app.core.config import get_settings
from app.modules.ai_memory.constants import AIMemoryStatus
from app.modules.ai_memory.service import AIMemoryService
from app.modules.feishu.constants import FeishuCommandName, FeishuReplyType
from app.modules.feishu.service import FeishuService

RULE_TITLE = "AI 学习规则"
RULE_CREATE_PATTERN = re.compile(r"^学习规则(?:\s+(\d{1,3}))?\s*[：:]\s*(.*)$")
MARKET_RULE_CREATE_PATTERN = re.compile(
    r"^学习市场规则(?:\s+(\d{1,3}))?\s*[：:]\s*(.*)$"
)
RULE_DISABLE_PATTERN = re.compile(r"^停用规则\s+(MEM-[A-Za-z0-9-]+)$", re.IGNORECASE)
RULE_ENABLE_PATTERN = re.compile(r"^启用规则\s+(MEM-[A-Za-z0-9-]+)$", re.IGNORECASE)
RULE_LIST_COMMANDS = {"查看规则", "规则列表", "查看市场规则"}
RULE_COMMAND_PREFIXES = (
    "学习市场规则",
    "学习规则",
    "查看市场规则",
    "查看规则",
    "规则列表",
    "停用规则",
    "启用规则",
)
RULE_COMMAND_HELP = (
    "规则指令格式：\n"
    "学习规则：<规则内容>\n"
    "学习规则 80：<规则内容>\n"
    "学习市场规则 80：<仅用于市场分析的规则内容>\n"
    "查看规则\n"
    "停用规则 <规则编号>\n"
    "启用规则 <规则编号>"
)


def handle_rule_command(
    db: Session,
    feishu: FeishuService,
    command_text: str,
    chat_id: str | None,
    actor: str,
    auto_reply: bool,
) -> dict[str, Any] | None:
    """Handle persistent AI rule commands."""

    if not command_text.startswith(RULE_COMMAND_PREFIXES):
        return None
    command = _command_name(command_text)
    if command in {
        FeishuCommandName.RULE_CREATE,
        FeishuCommandName.RULE_DISABLE,
        FeishuCommandName.RULE_ENABLE,
    } and get_settings().read_only_mode:
        return _result(
            feishu,
            command,
            "当前为只读模式，不能新增或修改学习规则。请由管理员启用操作后重试。",
            chat_id,
            actor,
            auto_reply,
        )

    content = RULE_COMMAND_HELP
    try:
        command, content = _execute(db, command_text, command, actor)
    except HTTPException as exc:
        detail = str(exc.detail)
        if "secret-like" in detail:
            content = "规则疑似包含密码、令牌或其他密钥信息，已拒绝学习。"
        elif exc.status_code == 404:
            content = "没有找到该规则，请先发送“查看规则”确认规则编号。"
        elif "priority" in detail:
            content = "规则优先级必须在 1 到 100 之间。"
        else:
            content = "规则未保存，请检查指令内容后重试。"
    return _result(feishu, command, content, chat_id, actor, auto_reply)


def _execute(
    db: Session,
    command_text: str,
    command: FeishuCommandName,
    actor: str,
) -> tuple[FeishuCommandName, str]:
    market_create_match = MARKET_RULE_CREATE_PATTERN.fullmatch(command_text)
    create_match = market_create_match or RULE_CREATE_PATTERN.fullmatch(command_text)
    disable_match = RULE_DISABLE_PATTERN.fullmatch(command_text)
    enable_match = RULE_ENABLE_PATTERN.fullmatch(command_text)
    memory = AIMemoryService(db)
    if create_match:
        return command, _create_rule(memory, create_match, market_create_match is not None, actor)
    if command_text in RULE_LIST_COMMANDS:
        return FeishuCommandName.RULE_LIST, _list_rules(memory, command_text)
    if disable_match or enable_match:
        enabled = enable_match is not None
        match = enable_match or disable_match
        rule = memory.update_rule(
            code=match.group(1),
            content=None,
            priority=None,
            tags=None,
            enabled=enabled,
            actor=actor,
        )
        state = "已启用" if enabled else "已停用"
        return (
            FeishuCommandName.RULE_ENABLE if enabled else FeishuCommandName.RULE_DISABLE,
            f"规则{state}。\n"
            f"编号：{rule['code']}\n"
            f"优先级：{rule['importance']}\n"
            f"范围：{rule['scope']} / {rule['subject']}\n"
            f"状态：{state}",
        )
    return command, RULE_COMMAND_HELP


def _create_rule(
    memory: AIMemoryService,
    match: re.Match[str],
    market_rule: bool,
    actor: str,
) -> str:
    priority = int(match.group(1) or 50)
    content = match.group(2).strip()
    if not content:
        return f"规则内容不能为空。\n\n{RULE_COMMAND_HELP}"
    if not 1 <= priority <= 100:
        return "规则优先级必须在 1 到 100 之间。"
    rule = memory.create_rule(
        content=content,
        scope="market" if market_rule else "global",
        subject="market" if market_rule else "company",
        priority=priority,
        tags=["feishu", *(["market"] if market_rule else [])],
        actor=actor,
    )
    return (
        "规则已学习。\n"
        f"编号：{rule['code']}\n"
        f"优先级：{rule['importance']}\n"
        f"范围：{rule['scope']} / {rule['subject']}\n"
        "状态：已启用"
    )


def _list_rules(memory: AIMemoryService, command_text: str) -> str:
    rules = memory.list_rules(
        scope="market" if command_text == "查看市场规则" else None,
        status_filter=AIMemoryStatus.ACTIVE,
        limit=20,
    )
    if not rules:
        return "当前没有已启用的学习规则。"
    lines = ["当前已启用的学习规则："]
    for rule in rules:
        rule_text = str(rule["content"])
        if len(rule_text) > 80:
            rule_text = f"{rule_text[:80]}…"
        lines.append(
            f"{rule['code']}｜优先级 {rule['importance']}｜"
            f"{rule['scope']}/{rule['subject']}\n{rule_text}"
        )
    return "\n\n".join(lines)


def _command_name(command_text: str) -> FeishuCommandName:
    if command_text.startswith("停用规则"):
        return FeishuCommandName.RULE_DISABLE
    if command_text.startswith("启用规则"):
        return FeishuCommandName.RULE_ENABLE
    if command_text.startswith(("查看市场规则", "查看规则", "规则列表")):
        return FeishuCommandName.RULE_LIST
    return FeishuCommandName.RULE_CREATE


def _result(
    feishu: FeishuService,
    command: FeishuCommandName,
    content: str,
    chat_id: str | None,
    actor: str,
    auto_reply: bool,
) -> dict[str, Any]:
    response = send_text_if_configured(feishu, chat_id, content, actor) if auto_reply else None
    return command_result(command, FeishuReplyType.TEXT, RULE_TITLE, content, response)