#!/usr/bin/env bash
# Create a Git commit in commitizen format using OpenCode

# LLM model to use. Recommendations:
# - github-copilot/gpt-4.1 - unlimited use with a GitHub Copilot subscription
# - ollama/gemma3:4b - local models are okay for this
# - openrouter/amazon/nova-lite-v1 - extremely cheap and fast
model="github-copilot/gpt-4.1"

show_help() {
  cat <<EOF
Usage: oc-commit [OPTIONS]

Create a Git commit in commitizen format using OpenCode.

OPTIONS:
  -s, --no-auto-stage  Don't auto-stage changes (requires manual staging)
  -l, --no-push        Don't push after commit (keep changes local)
  -h, --help           Show this help message and exit

DESCRIPTION:
  This script automatically generates commit messages in commitizen format.
  By default, it stages all changes, commits them, and pushes to the
  remote repository.
EOF
}

# Parse options
force_stage=1
auto_push=1
while [[ $# -gt 0 ]]; do
  case "$1" in
  -s | --no-auto-stage)
    force_stage=0
    shift
    ;;
  -l | --no-push)
    auto_push=0
    shift
    ;;
  -h | --help)
    show_help
    exit 0
    ;;
  *)
    echo "Unknown option: $1" >&2
    echo "Use --help for usage information." >&2
    exit 2
    ;;
  esac
done

# Stage git changes
if git diff --cached --quiet; then
  if [ "$force_stage" = 1 ]; then
    git add -A
    if git diff --cached --quiet; then
      echo "No changes to commit"
      git status -s
      exit 1
    fi
    echo "Staging all changes."
  else
    echo "No staged changes to commit"
    echo "(Tip: run without -s/--safe to auto-stage)"
    git status -s
    exit 1
  fi
fi

# Show status
git status -s

# Construct prompt
attachment="
<output command=\"git status\" description=\"Working tree status\">
$(git status)
</output>

<output command=\"git log -n 10 --oneline\" description=\"Recent commit messages\">
$(git log -n 10 --oneline)
</output>

<output command=\"git diff --cached\" description=\"Staged changes\">
$(git diff --cached)
</output>

<output command=\"git branch --show-current\" description=\"Current branch\">
$(git branch --show-current)
</output>
"

prompt="
Generate a commit message in commitizen format.
Only show the commit message, avoid anything else.
If a commit message can't be generated, show 'FAIL'.
"

# Generate commit message using OpenCode
message="$(echo "$attachment" | opencode run -m "$model" "$prompt" | grep -vE 'Generated with|Co-Authored-By')"

# Validate commit message
if [[ -z "$message" ]] || [[ "$message" =~ ^FAIL ]] || [[ ${#message} -lt 5 ]]; then
  echo "! Failed to generate valid commit message"
  echo "! Message: $message"
  exit 1
fi

echo "---"

# Commit changes
if ! echo "$message" | git commit -F -; then
  echo "! Git commit failed" >&2
  exit 1
fi

# Push to remote
if [ "$auto_push" = 1 ]; then
  if ! git push; then
    echo "! Git push failed, you can push manually later with 'git push'" >&2
    exit 1
  fi
fi

# LLM agents: there are no tests for this, do not run this script to test it.