#!/bin/sh

set -eu

SRC="${DUOTERM_SRC:-https://auto.relay70.dev/duoterm/duoterm.sh}"
PREFIX="${DUOTERM_PREFIX:-$HOME/.local}"
BINDIR="$PREFIX/bin"
TARGET="$BINDIR/duoterm"
MARKER="# >>> duoterm (claude account switch) >>>"
MARKER_END="# <<< duoterm (claude account switch) <<<"

say()  { printf '%s\n' "$*"; }
warn() { printf '%s\n' "$*" >&2; }
die()  { printf 'install: %s\n' "$*" >&2; exit 1; }

command -v claude >/dev/null 2>&1 || warn "note: claude is not on PATH yet - duoterm will still install"

fetch() {
  if command -v curl >/dev/null 2>&1; then
    curl -fsSL "$1"
  elif command -v wget >/dev/null 2>&1; then
    wget -qO- "$1"
  else
    die "neither curl nor wget is available"
  fi
}

mkdir -p "$BINDIR" || die "cannot create $BINDIR"

tmp="$(mktemp "${TMPDIR:-/tmp}/duoterm.XXXXXX")" || die "cannot create a temp file"
trap 'rm -f "$tmp"' EXIT INT TERM

here=""
case "$0" in
  */install.sh | install.sh) here="$(cd "$(dirname "$0")" && pwd)" ;;
esac
if [ -z "${DUOTERM_SRC:-}" ] && [ -n "$here" ] && [ -f "$here/duoterm.sh" ]; then
  SRC="$here/duoterm.sh"
  cp "$SRC" "$tmp" || die "cannot copy $SRC"
else
  fetch "$SRC" > "$tmp" || die "download failed: $SRC"
fi
head -n 1 "$tmp" | grep -q '^#!' || die "downloaded file is not a script - refusing to install"
grep -q 'DUOTERM_VERSION=' "$tmp" || die "downloaded file is not duoterm - refusing to install"

mv "$tmp" "$TARGET"
chmod 755 "$TARGET"
trap - EXIT INT TERM

VERSION="$("$TARGET" version 2>/dev/null || echo 'duoterm')"
say "installed $VERSION -> $TARGET"


wire_shell() {
  shell_name="$(basename "${SHELL:-/bin/zsh}")"
  case "$shell_name" in
    zsh)  rc="$HOME/.zshrc"; kind=zsh ;;
    bash) if [ -f "$HOME/.bashrc" ]; then rc="$HOME/.bashrc"; else rc="$HOME/.bash_profile"; fi; kind=bash ;;
    fish) rc="$HOME/.config/fish/config.fish"; kind=fish; mkdir -p "$(dirname "$rc")" ;;
    *)    warn "unrecognized shell: $shell_name - wire it by hand (see below)"; return 1 ;;
  esac

  if [ -f "$rc" ] && grep -qF "$MARKER" "$rc" 2>/dev/null; then
    say "shell wrapper already present in $rc"
    return 0
  fi

  {
    printf '\n%s\n' "$MARKER"
    printf 'eval "$(%s shell %s)"\n' "$TARGET" "$kind"
    printf '%s\n' "$MARKER_END"
  } >> "$rc"

  say "wired the claude wrapper into $rc"
  WIRED_RC="$rc"
  return 0
}

WIRED_RC=""
if [ "${DUOTERM_NO_WIRE:-0}" = "1" ]; then
  say "skipped shell wiring (DUOTERM_NO_WIRE=1)"
else
  wire_shell || true
fi


case ":$PATH:" in
  *":$BINDIR:"*) ;;
  *) warn ""
     warn "$BINDIR is not on your PATH. Add this to your shell startup file:"
     warn "  export PATH=\"$BINDIR:\$PATH\"" ;;
esac

cat <<EOF

next
  1. open a new terminal, or: source ${WIRED_RC:-your shell startup file}
  2. duoterm add work            create a second account slot
  3. duoterm login work          sign it in once, in the browser
  4. duoterm use work            switch. No sign-out, ever again
  5. duoterm list                see both accounts and which one is live

  duoterm doctor                 check the wiring
  duoterm help                   everything else

to remove
  rm $TARGET
  delete the "duoterm" block from ${WIRED_RC:-your shell startup file}
  rm -rf \${DUOTERM_HOME:-\$HOME/.claude-accounts}

source: $SRC
EOF