import { z } from "zod";
import type { JSONSchema7 } from "json-schema";
import { dbGlobal } from "drizzle-pkg/lib/db";
import { users } from "drizzle-pkg/lib/schema/auth";
import { eq } from "drizzle-orm";
import type { ToolExecutor, ToolContext, ToolResult } from "../../registry";
import type { UserInfoToolConfig } from "./config";

export const userInfoInputSchema = z.object({}).describe("无需参数，自动获取当前登录用户信息");

type UserInfoInput = z.infer<typeof userInfoInputSchema>;

export const userInfoExecutor: ToolExecutor<UserInfoToolConfig> = {
  buildInputSchema(_config: UserInfoToolConfig): JSONSchema7 {
    return {
      type: "object",
      properties: {},
      description: "无需参数，自动根据当前会话获取用户信息",
    };
  },

  buildDescription(config: UserInfoToolConfig): string {
    const fields: string[] = [];
    if (config.includeEmail) fields.push("邮箱");
    if (config.includeAvatar) fields.push("头像");
    if (config.includeRole) fields.push("角色");
    if (config.includeStatus) fields.push("状态");
    if (config.includeCreatedAt) fields.push("注册时间");
    const fieldDesc = fields.length > 0 ? fields.join("、") : "基本信息";
    return `获取当前登录用户信息（含${fieldDesc}）。无需传入参数，自动从会话上下文中识别当前用户。`;
  },

  async execute(
    input: unknown,
    config: UserInfoToolConfig,
    ctx: ToolContext,
  ): Promise<ToolResult> {
    const start = Date.now();

    const parsed = userInfoInputSchema.safeParse(input);
    if (!parsed.success) {
      return {
        success: false,
        data: null,
        error: `输入参数校验失败: ${parsed.error.message}`,
        metadata: { durationMs: Date.now() - start },
      };
    }

    if (ctx.userId === null || ctx.userId === undefined) {
      return {
        success: false,
        data: null,
        error: "无法识别当前用户：会话上下文中缺少 userId。该工具需要在登录会话中调用。",
        metadata: { durationMs: Date.now() - start },
      };
    }

    try {
      const rows = await dbGlobal
        .select({
          id: users.id,
          username: users.username,
          email: users.email,
          nickname: users.nickname,
          avatar: users.avatar,
          role: users.role,
          status: users.status,
          createdAt: users.createdAt,
        })
        .from(users)
        .where(eq(users.id, ctx.userId))
        .limit(1);

      const user = rows[0];
      if (!user) {
        return {
          success: false,
          data: null,
          error: `未找到用户 (id=${ctx.userId})`,
          metadata: { durationMs: Date.now() - start },
        };
      }

      const data: Record<string, unknown> = {
        id: user.id,
        username: user.username,
        nickname: user.nickname ?? null,
      };
      if (config.includeEmail) data.email = user.email ?? null;
      if (config.includeAvatar) data.avatar = user.avatar ?? null;
      if (config.includeRole) data.role = user.role;
      if (config.includeStatus) data.status = user.status;
      if (config.includeCreatedAt) {
        data.createdAt = user.createdAt
          ? new Date(user.createdAt).toISOString()
          : null;
      }

      return {
        success: true,
        data,
        metadata: { durationMs: Date.now() - start },
      };
    } catch (e) {
      return {
        success: false,
        data: null,
        error: e instanceof Error ? e.message : String(e),
        metadata: { durationMs: Date.now() - start },
      };
    }
  },
};