#!/bin/sh
# Festoon installer.
#
#   curl -fsSL https://get.festoon.dev | sh
#
# Downloads the standalone binary for this platform and puts it on PATH.
# No Python, no package manager, no repository clone.

set -eu

# The PUBLIC release repository, not the private source one — a private
# repo's assets 404 for unauthenticated curl. Keep in step with REPO in
# src/festoon/cli/upgrade.py and RELEASE_REPO in the release workflow.
REPO="${FESTOON_REPO:-standley-brent/festoon-cli}"
VERSION="${FESTOON_VERSION:-latest}"
# Prefer a user-writable location so the common case needs no sudo.
INSTALL_DIR="${FESTOON_INSTALL_DIR:-$HOME/.local/bin}"

err() { printf 'festoon: %s\n' "$1" >&2; exit 1; }

detect_target() {
    os=$(uname -s)
    arch=$(uname -m)
    case "$os" in
        Darwin) os=macos ;;
        Linux)  os=linux ;;
        *) err "unsupported operating system: $os (Windows: see the MSI installer)" ;;
    esac
    case "$arch" in
        arm64|aarch64) arch=arm64 ;;
        x86_64|amd64)  arch=x64 ;;
        *) err "unsupported architecture: $arch" ;;
    esac
    printf '%s-%s' "$os" "$arch"
}

main() {
    command -v curl >/dev/null 2>&1 || err "curl is required"

    target=$(detect_target)
    if [ "$VERSION" = "latest" ]; then
        url="https://github.com/$REPO/releases/latest/download/festoon-$target"
    else
        url="https://github.com/$REPO/releases/download/$VERSION/festoon-$target"
    fi

    tmp=$(mktemp -d)
    # Always clean up, including on failure — a half-downloaded binary left in
    # /tmp is worse than none.
    trap 'rm -rf "$tmp"' EXIT INT TERM

    printf 'Downloading festoon (%s)...\n' "$target"
    if ! curl -fsSL "$url" -o "$tmp/festoon"; then
        err "download failed: $url
  If this version has no build for $target yet, check:
  https://github.com/$REPO/releases"
    fi

    chmod +x "$tmp/festoon"

    # Verify before installing, so a corrupt download cannot replace a
    # working install.
    if ! "$tmp/festoon" --version >/dev/null 2>&1; then
        err "the downloaded binary did not run — installation aborted"
    fi

    mkdir -p "$INSTALL_DIR"
    mv "$tmp/festoon" "$INSTALL_DIR/festoon"

    version=$("$INSTALL_DIR/festoon" --version 2>/dev/null || echo festoon)
    printf '\n%s installed to %s\n' "$version" "$INSTALL_DIR/festoon"

    case ":$PATH:" in
        *":$INSTALL_DIR:"*)
            printf '\nNext: festoon join <your-org>\n'
            ;;
        *)
            printf '\n%s is not on your PATH. Add it:\n' "$INSTALL_DIR"
            printf '  echo '"'"'export PATH="%s:$PATH"'"'"' >> ~/.zshrc && exec zsh\n' "$INSTALL_DIR"
            printf '\nThen: festoon join <your-org>\n'
            ;;
    esac
}

main "$@"