// opencode-plugin/index.ts — Consciousness integration for OpenCode.
//
// Bridges OpenCode events to the consciousness system:
//   - chat.message → forwards to poc-hook-opencode, appends output as text part
//   - tool.execute.after → signals response activity
//   - event → tracks session lifecycle (idle, compacted, etc.)
//   - shell.env → injects POC_SESSION_ID into subprocesses
//
// Install: copy this directory to your project's `plugin/` or `plugins/` dir,
// or add to opencode.json:
//   "plugin": ["/home/kent/poc/consciousness-claude/opencode-plugin"]

import type { Plugin, Hooks } from "@opencode-ai/plugin"
import path from "path"
import { $ } from "bun"
import { $ } from "bun"

// Find the poc-hook-opencode binary
function findHookBinary(): string {
  const candidates = [
    path.join(process.env.HOME || "", ".cargo/bin/poc-hook-opencode"),
    path.join(process.env.HOME || "", "poc/consciousness-claude/target/debug/poc-hook-opencode"),
    path.join(process.env.HOME || "", "poc/consciousness-claude/target/release/poc-hook-opencode"),
  ]
  for (const c of candidates) {
    try {
      const stat = Bun.file(c).statSync()
      if (stat?.isFile()) return c
    } catch {}
  }
  return "poc-hook-opencode"
}

const HOOK_BINARY = findHookBinary()

// Generate a unique part ID (opencode uses ulid-like ascending IDs)
let partCounter = 0
function nextPartId(): string {
  partCounter += 1
  return `poc_part_${Date.now()}_${partCounter}`
}

export const ConsciousnessPlugin: Plugin = async (ctx) => {
  const hooks: Hooks = {}

  // Main hook: forward user messages to consciousness, inject context
  hooks["chat.message"] = async (input, output) => {
    const hookInput = JSON.stringify({
      session_id: input.sessionID,
      hook_event: "UserPromptSubmit",
    })

    try {
      const proc = Bun.spawn([HOOK_BINARY], {
        stdin: hookInput,
        stdout: "pipe",
        stderr: "pipe",
      })
      const [stdout, stderr] = await Promise.all([
        new Response(proc.stdout).text(),
        new Response(proc.stderr).text(),
      ])
      await proc.exited

      if (stdout && stdout.trim()) {
        // Append as a text part — must match MessageV2.TextPart schema:
        // { id, sessionID, messageID, type: "text", text, time?, synthetic?, ignored? }
        output.parts.push({
          id: nextPartId(),
          sessionID: input.sessionID,
          messageID: output.message.id,
          type: "text",
          text: stdout,
          synthetic: true,
        })
      }

      if (stderr && stderr.trim()) {
        console.error("[consciousness] hook stderr:", stderr.slice(0, 500))
      }
    } catch (e) {
      console.error("[consciousness] hook error:", e)
    }
  }

  // Signal response after tool use
  hooks["tool.execute.after"] = async () => {
    try {
      await $`poc-daemon response`.quiet()
    } catch {
      // Daemon might not be running
    }
  }

  // Inject POC_SESSION_ID into all shell commands
  hooks["shell.env"] = async (input, output) => {
    if (input.sessionID) {
      output.env["POC_SESSION_ID"] = input.sessionID
    }
  }

  // Track session events
  hooks["event"] = async ({ event }) => {
    if (event.type === "session.compacted") {
      // Compaction detected — next hook invocation will detect via SQLite
    }
    if (event.type === "session.idle") {
      // Session went idle
    }
  }

  return hooks
}