#!/usr/bin/env bash
set -euo pipefail

# Repeatedly asks opencode to continue autonomous project work.
#
# Configuration:
#   OPENCODE_BIN       Command to run. Default: opencode
#   OPENCODE_PROJECT   Project/workspace path. Default: current directory
#   OPENCODE_SESSION   Session id to continue. If unset, uses --continue
#   OPENCODE_MODEL     Optional model, e.g. openai/gpt-5.5
#   OPENCODE_AGENT     Optional agent name
#   OPENCODE_EXTRA_ARGS Optional extra args inserted before the message, shell-split
#   AUTOPILOT_MESSAGE  Message sent each iteration. Default: keep working prompt below
#   AUTOPILOT_INTERVAL Seconds to sleep between successful iterations. Default: 10
#   AUTOPILOT_MAX_RUNS Max iterations. 0 means forever. Default: 0
#   AUTOPILOT_STOP_FILE Stop when this file exists. Default: .opencode-autopilot-stop
#   AUTOPILOT_ALLOW_PERMISSIONS Automatically approve tool permissions. Default: 1

OPENCODE_BIN=${OPENCODE_BIN:-opencode}
OPENCODE_PROJECT=${OPENCODE_PROJECT:-$(pwd)}
AUTOPILOT_INTERVAL=${AUTOPILOT_INTERVAL:-10}
AUTOPILOT_MAX_RUNS=${AUTOPILOT_MAX_RUNS:-0}
AUTOPILOT_STOP_FILE=${AUTOPILOT_STOP_FILE:-.opencode-autopilot-stop}
AUTOPILOT_ALLOW_PERMISSIONS=${AUTOPILOT_ALLOW_PERMISSIONS:-1}
AUTOPILOT_MESSAGE=${AUTOPILOT_MESSAGE:-Continue working autonomously in this configured session. Keep working on the current task list. If every task is finished, inspect the project, decide the next highest-value tasks, add or update the task list, implement them, verify them, and continue until blocked. Do not stop just because one task is complete; stop only for a real blocker that requires user input.}

run_count=0

while true; do
  if [[ -e "$AUTOPILOT_STOP_FILE" ]]; then
    printf 'stop file exists: %s\n' "$AUTOPILOT_STOP_FILE"
    exit 0
  fi

  if [[ "$AUTOPILOT_MAX_RUNS" != "0" && "$run_count" -ge "$AUTOPILOT_MAX_RUNS" ]]; then
    printf 'reached AUTOPILOT_MAX_RUNS=%s\n' "$AUTOPILOT_MAX_RUNS"
    exit 0
  fi

  args=(run --dir "$OPENCODE_PROJECT")

  if [[ "$AUTOPILOT_ALLOW_PERMISSIONS" != "0" ]]; then
    args+=(--dangerously-skip-permissions)
  fi

  if [[ -n "${OPENCODE_SESSION:-}" ]]; then
    args+=(--session "$OPENCODE_SESSION")
  else
    args+=(--continue)
  fi

  if [[ -n "${OPENCODE_MODEL:-}" ]]; then
    args+=(--model "$OPENCODE_MODEL")
  fi

  if [[ -n "${OPENCODE_AGENT:-}" ]]; then
    args+=(--agent "$OPENCODE_AGENT")
  fi

  if [[ -n "${OPENCODE_EXTRA_ARGS:-}" ]]; then
    # shellcheck disable=SC2206
    extra_args=($OPENCODE_EXTRA_ARGS)
    args+=("${extra_args[@]}")
  fi

  args+=("$AUTOPILOT_MESSAGE")

  run_count=$((run_count + 1))
  printf '[%s] autopilot iteration %d\n' "$(date -Is)" "$run_count"
  "$OPENCODE_BIN" "${args[@]}"

  sleep "$AUTOPILOT_INTERVAL"
done