#!/usr/bin/env bash
# vagents one-line installer.
#
# Designed to be invoked as:
#
#     curl -fsSL https://<installer-host>/install | sh
#
# Steps it performs:
#   1. Pre-flight: macOS or Linux, python3, git on PATH.
#   2. Clone (or fast-forward) the BuddyTV/SITREP repo into ~/.vagents/src.
#      Pin to the configured ref (default 'main' -- the semantic-release
#      tagged stable branch) unless SITREP_INSTALL_REF overrides.
#   3. Hand off to sitrep/install.sh inside the checkout, which
#      uses uv tool install to put the `sitrep` binary on PATH.
#   4. Print the next step (`sitrep auth login`).
#
# Re-running this script upgrades an existing install in place: the
# checkout is fast-forwarded to the configured ref and sitrep/
# install.sh is re-run (idempotent).
#
# Override knobs (env vars):
#   SITREP_INSTALL_DIR  Default ~/.vagents/src. Where the source
#                         checkout lives. Set to a writable path you
#                         control if you want it elsewhere.
#   SITREP_INSTALL_REF  Default 'main'. Branch / tag / commit-sha
#                         to check out. Use 'feat/platform-v1' (or
#                         a specific tag like 'v1.2.3') to install
#                         a non-main version.
#   SITREP_REPO_URL     Default https://github.com/BuddyTV/SITREP.git.
#                         Override only for forks / mirrors.

set -euo pipefail

REPO_URL="${SITREP_REPO_URL:-https://github.com/BuddyTV/SITREP.git}"
INSTALL_DIR="${SITREP_INSTALL_DIR:-$HOME/.vagents/src}"
INSTALL_REF="${SITREP_INSTALL_REF:-main}"

if [[ -t 1 ]]; then
  BOLD=$'\033[1m'; DIM=$'\033[2m'; RED=$'\033[31m'
  GREEN=$'\033[32m'; YELLOW=$'\033[33m'; CYAN=$'\033[36m'; RESET=$'\033[0m'
else
  BOLD=""; DIM=""; RED=""; GREEN=""; YELLOW=""; CYAN=""; RESET=""
fi

step()  { printf "\n${BOLD}${CYAN}==>${RESET} ${BOLD}%s${RESET}\n" "$*"; }
info()  { printf "    %s\n" "$*"; }
ok()    { printf "    ${GREEN}\xe2\x9c\x93${RESET} %s\n" "$*"; }
warn()  { printf "    ${YELLOW}!${RESET} %s\n" "$*"; }
die()   { printf "\n${RED}error:${RESET} %s\n" "$*" >&2; exit 1; }

# ---------------------------------------------------------------------------
# Pre-flight
# ---------------------------------------------------------------------------

step "Checking environment"

case "$(uname -s)" in
  Darwin) ok "macOS detected" ;;
  Linux)  warn "Linux detected — should work but only Mac is officially tested" ;;
  *)      die "Unsupported OS: $(uname -s)." ;;
esac

if ! command -v git >/dev/null 2>&1; then
  die "git is required but not on PATH. Install it (e.g. \`xcode-select --install\` on macOS) and retry."
fi
ok "git = $(git --version | awk '{print $3}')"

if command -v python3 >/dev/null 2>&1; then
  py_ver="$(python3 -c 'import sys; print("%d.%d" % sys.version_info[:2])')"
  ok "python3 = $py_ver"
else
  warn "python3 not found — uv will install its own Python during install"
fi

# ---------------------------------------------------------------------------
# Checkout / update
# ---------------------------------------------------------------------------

step "Fetching vagents source"
info "repo:    $REPO_URL"
info "ref:     $INSTALL_REF"
info "target:  $INSTALL_DIR"

# Make sure the parent dir exists (defensive: someone could set
# SITREP_INSTALL_DIR to a deeply-nested path).
mkdir -p "$(dirname "$INSTALL_DIR")"

if [[ -d "$INSTALL_DIR/.git" ]]; then
  # Existing checkout -- fast-forward / reset to the requested ref.
  info "found existing checkout, updating..."
  git -C "$INSTALL_DIR" fetch --depth=1 origin "$INSTALL_REF" \
    || die "git fetch failed (network? bad SITREP_INSTALL_REF=$INSTALL_REF?)"
  git -C "$INSTALL_DIR" checkout --force FETCH_HEAD \
    || die "git checkout FETCH_HEAD failed inside $INSTALL_DIR"
  ok "updated to $INSTALL_REF"
elif [[ -e "$INSTALL_DIR" ]]; then
  die "$INSTALL_DIR exists but is not a git checkout. Move it aside and retry, or set SITREP_INSTALL_DIR to a different path."
else
  info "fresh clone..."
  # Shallow clone keeps install fast; the install.sh inside doesn't need
  # full history.
  git clone --depth=1 --branch "$INSTALL_REF" "$REPO_URL" "$INSTALL_DIR" \
    || die "git clone failed (network? bad SITREP_INSTALL_REF=$INSTALL_REF?)"
  ok "cloned to $INSTALL_DIR"
fi

# ---------------------------------------------------------------------------
# Hand off to the host installer
# ---------------------------------------------------------------------------

HOST_INSTALLER="$INSTALL_DIR/sitrep/install.sh"
[[ -x "$HOST_INSTALLER" ]] || die "expected $HOST_INSTALLER to exist and be executable -- repo layout changed?"

step "Running the host installer"
"$HOST_INSTALLER"

# ---------------------------------------------------------------------------
# Done
# ---------------------------------------------------------------------------

cat <<EOF

${BOLD}${GREEN}vagents installed.${RESET}

${BOLD}Next:${RESET}
  ${CYAN}1.${RESET} Sign in (one-time, ~30 sec):
       ${BOLD}sitrep auth login${RESET}

  ${CYAN}2.${RESET} Start chatting:
       ${BOLD}sitrep${RESET}

${DIM}Source checkout: $INSTALL_DIR
ref pinned to:   $INSTALL_REF
upgrade later:   re-run this command, or \`cd $INSTALL_DIR && git pull && sitrep/install.sh\`${RESET}
EOF