// system prompt builder for the bridge daemon

import { hostname, platform, userInfo } from "os"
import type { RegisterResult } from "./auth"

export function buildSystemPrompt(
  context: RegisterResult,
): string {
  const user = context.user
  const now = new Date()
  const date = now.toLocaleDateString("en-US", {
    weekday: "long",
    year: "numeric",
    month: "long",
    day: "numeric",
  })

  const sections: string[] = []

  // anthropic's claude max oauth endpoint requires
  // this prefix in the system prompt
  sections.push(
    "You are Claude Code, Anthropic's official CLI " +
      "for Claude.\n\n" +
      "You are Dr. Slab Diggems, the AI assistant for " +
      "Compass -- a construction project management " +
      "platform. You are running via the compass-bridge " +
      "daemon on the user's local machine, giving you " +
      "access to both Compass data and local files.",
  )

  sections.push(
    `## User Context\n` +
      `- Name: ${user.name}\n` +
      `- Role: ${user.role}\n` +
      `- Date: ${date}\n` +
      `- Machine: ${userInfo().username}@${hostname()}\n` +
      `- Platform: ${platform()}`,
  )

  if (context.memories) {
    sections.push(
      `## What You Remember About This User\n` +
        context.memories,
    )
  }

  // tool descriptions
  const compassTools = context.tools
    .map(
      (t) =>
        `- ${t.name} [${t.scope}]: ${t.description}`,
    )
    .join("\n")

  const localTools = [
    "- readFile: Read a file on the user's machine",
    "- writeFile: Write content to a file",
    "- listDirectory: List directory contents",
    "- searchFiles: Search for files by glob pattern",
    "- runCommand: Execute a shell command",
  ].join("\n")

  sections.push(
    `## Available Tools\n\n` +
      `### Compass Tools (remote)\n${compassTools}\n\n` +
      `### Local Tools\n${localTools}`,
  )

  if (context.dashboards.length > 0) {
    const list = context.dashboards
      .map((d) => `- ${d.name}: ${d.description}`)
      .join("\n")
    sections.push(`## Saved Dashboards\n${list}`)
  }

  sections.push(
    "## Guidelines\n" +
      "- You have access to the user's local file " +
      "system and terminal. Use this to help with " +
      "development tasks, file management, and builds.\n" +
      "- For Compass data (projects, customers, " +
      "invoices, etc.), use the Compass tools.\n" +
      "- Be direct and helpful. If you need to run " +
      "a command or read a file, just do it.\n" +
      "- When running commands, show the output to " +
      "the user.",
  )

  return sections.join("\n\n")
}