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

REPO_URL="${REPO_URL:-https://fun-md.com/Fun_MD/devops-skills.git}"
SKILL_NAME="gitea-issue-devops-agent"
CODEX_HOME="${CODEX_HOME:-$HOME/.codex}"
TARGET_DIR="${CODEX_HOME}/skills/${SKILL_NAME}"
TMP_DIR="$(mktemp -d)"
INSTALL_JJ="${INSTALL_JJ:-1}"
JJ_INSTALL_METHOD="${JJ_INSTALL_METHOD:-auto}"
JJ_CHANNEL="${JJ_CHANNEL:-release}"

log() {
  echo "[install] $*"
}

warn() {
  echo "[install] warning: $*" >&2
}

manual_jj_help() {
  warn "jj was not installed automatically."
  warn "Manual options:"
  warn "  - Homebrew: brew install jj"
  warn "  - cargo-binstall: cargo binstall --strategies crate-meta-data jj-cli"
  if [ "$JJ_CHANNEL" = "prerelease" ]; then
    warn "  - cargo prerelease: cargo install --git https://github.com/jj-vcs/jj.git --locked --bin jj jj-cli"
  else
    warn "  - cargo release: cargo install --locked --bin jj jj-cli"
  fi
  warn "After installation, verify with: jj --version"
}

install_jj_with_brew() {
  if ! command -v brew >/dev/null 2>&1; then
    return 1
  fi
  if [ "$JJ_CHANNEL" != "release" ]; then
    warn "brew path skipped because prerelease jj is requested."
    return 1
  fi

  log "attempting jj installation via Homebrew"
  brew install jj
}

install_jj_with_binstall() {
  if ! command -v cargo >/dev/null 2>&1 || ! command -v cargo-binstall >/dev/null 2>&1; then
    return 1
  fi
  if [ "$JJ_CHANNEL" != "release" ]; then
    warn "cargo-binstall path skipped because prerelease jj is requested."
    return 1
  fi

  log "attempting jj installation via cargo-binstall"
  cargo binstall --strategies crate-meta-data jj-cli
}

install_jj_with_cargo() {
  if ! command -v cargo >/dev/null 2>&1; then
    return 1
  fi

  log "attempting jj installation via cargo"
  if [ "$JJ_CHANNEL" = "prerelease" ]; then
    cargo install --git https://github.com/jj-vcs/jj.git --locked --bin jj jj-cli
  else
    cargo install --locked --bin jj jj-cli
  fi
}

attempt_jj_install() {
  if [ "$INSTALL_JJ" = "0" ]; then
    log "skipping jj installation because INSTALL_JJ=0"
    return 0
  fi

  if command -v jj >/dev/null 2>&1; then
    log "jj already installed: $(jj --version)"
    return 0
  fi

  case "$JJ_INSTALL_METHOD" in
    auto)
      install_jj_with_brew || install_jj_with_binstall || install_jj_with_cargo || {
        manual_jj_help
        return 0
      }
      ;;
    brew)
      install_jj_with_brew || {
        manual_jj_help
        return 0
      }
      ;;
    binstall)
      install_jj_with_binstall || {
        manual_jj_help
        return 0
      }
      ;;
    cargo)
      install_jj_with_cargo || {
        manual_jj_help
        return 0
      }
      ;;
    *)
      warn "unsupported JJ_INSTALL_METHOD='$JJ_INSTALL_METHOD'; skipping jj install."
      manual_jj_help
      return 0
      ;;
  esac

  if command -v jj >/dev/null 2>&1; then
    log "jj installation succeeded: $(jj --version)"
  else
    manual_jj_help
  fi
}

cleanup() {
  rm -rf "$TMP_DIR"
}
trap cleanup EXIT

if ! command -v git >/dev/null 2>&1; then
  log "git is required but not found."
  exit 1
fi

log "downloading ${SKILL_NAME} from ${REPO_URL}"
git clone --depth 1 "$REPO_URL" "$TMP_DIR/repo" >/dev/null 2>&1

if [ ! -d "$TMP_DIR/repo/skills/${SKILL_NAME}" ]; then
  log "skill directory not found in repository."
  exit 1
fi

mkdir -p "${CODEX_HOME}/skills"
rm -rf "$TARGET_DIR"
cp -R "$TMP_DIR/repo/skills/${SKILL_NAME}" "$TARGET_DIR"

log "skill installed"
log "installed path: ${TARGET_DIR}"
attempt_jj_install
log "done"