// OSC 99 Desktop Notifications for OpenCode
//
// Sends desktop notifications via the OSC 99 escape sequence protocol
// when OpenCode needs your attention. Notifications are only shown when
// the terminal window is unfocused (o=unfocused).
//
// Tested with: Kitty terminal
// May also work with other terminals that support the OSC 99 protocol.
//
// Features:
//   - Notifies when a session goes idle (waiting for your input)
//   - Notifies when a question is asked (e.g. multiple choice)
//   - Notifies when a permission prompt is raised
//   - Notifies when a session error occurs
//   - Includes the project directory name in the notification title
//   - Suppresses notifications from subagent sessions (e.g. Explore Task)
//   - Suppresses notifications when the terminal window is focused
//   - Uses distinct sounds per notification type (system, question, error)
//
// Installation:
//   Copy this file to ~/.config/opencode/plugins/osc99-notify.js
//
// Notification types:
//   Idle:       title  ->  OpenCode (project-name)
//               body   ->  Waiting for your input
//               sound  ->  system
//
//   Question:   title  ->  OpenCode (project-name)
//               body   ->  Has a question for you
//               sound  ->  question
//
//   Permission: title  ->  OpenCode (project-name)
//               body   ->  Needs your permission
//               sound  ->  question
//
//   Error:      title  ->  OpenCode (project-name)
//               body   ->  Encountered an error
//               sound  ->  error

export const OSC99Notify = async ({ client }) => {
  const path = require('path')
  const project = path.basename(process.cwd())
  let id = 0

  const notify = (icon, message, sound = 'system') => {
    id++
    process.stderr.write(`\x1b]99;i=${id}:d=0:s=${sound}:o=unfocused;${icon} OpenCode (${project})\x1b\\`)
    process.stderr.write(`\x1b]99;i=${id}:p=body;${message}\x1b\\`)
  }

  return {
    event: async ({ event }) => {
      if (event.type === "message.part.updated" && event.properties.part.type === "tool" && event.properties.part.tool === "question" && event.properties.part.state?.status === "pending")
        notify('❓', 'Has a question for you', 'question')

      if (event.type === "session.idle") {
        const session = await client.session.get({ path: { id: event.properties.sessionID } })
        if (!session.data?.parentID)
          notify('🤖', 'Waiting for your input')
      }
      if (event.type === "session.error") {
        const session = await client.session.get({ path: { id: event.properties.sessionID } })
        if (!session.data?.parentID)
          notify('🚨', 'Encountered an error', 'error')
      }
      if (event.type === "permission.updated")
        notify('🔐', 'Needs your permission', 'question')
    },
  }
}