#!/usr/bin/env bash
# Download and vendor libraries into vendor/.
# Files are named {pkg}-{ver}.{ext}, with {pkg}.{ext} symlinks for stable references.
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"

VENDOR="$PROJECT_DIR/vendor"
WEBUI_VENDOR="$PROJECT_DIR/webui/static/vendor"

# ---- Library versions ----
ACME_VERSION="3.1.3"
HTM_VERSION="3.1.1"

# ---- Helpers ----
download() {
    local name="$1" url="$2" dest="$3"
    if [[ -n "${SKIP_DOWNLOAD:-}" ]]; then
        echo "[skip] $name"
        return
    fi
    if [[ -f "$dest" ]]; then
        echo "[skip] $name (already present)"
        return
    fi
    echo "[download] $name → $dest"
    curl -sfL -o "$dest" "$url"
}

ensure_symlink() {
    local link="$1" target="$2"
    if [[ -L "$link" ]]; then
        cur=$(readlink "$link")
        if [[ "$cur" != "$target" ]]; then
            echo "[symlink] $link → $target (updated)"
            ln -sf "$target" "$link"
        fi
    elif [[ -e "$link" ]]; then
        echo "[symlink] $link (replacing existing file)"
        mv -f "$link" "${link}.bak" && ln -sf "$target" "$link"
    else
        echo "[symlink] $link → $target"
        ln -sf "$target" "$link"
    fi
}

# ---- acme.sh ----
ACME_VERSIONED="$VENDOR/acme-${ACME_VERSION}.sh"
ACME_SYMLINK="$VENDOR/acme.sh"
download "acme.sh@${ACME_VERSION}" \
    "https://raw.githubusercontent.com/acmesh-official/acme.sh/${ACME_VERSION}/acme.sh" \
    "$ACME_VERSIONED"
chmod +x "$ACME_VERSIONED"
ensure_symlink "$ACME_SYMLINK" "acme-${ACME_VERSION}.sh"

# ---- htm ----
HTM_VERSIONED="$VENDOR/htm-${HTM_VERSION}.js"
HTM_SYMLINK="$VENDOR/htm.js"
download "htm@${HTM_VERSION}" \
    "https://cdn.jsdelivr.net/npm/htm@${HTM_VERSION}/mini/index.module.js" \
    "$HTM_VERSIONED"
ensure_symlink "$HTM_SYMLINK" "htm-${HTM_VERSION}.js"

# ---- ACME_HOME (acme.sh runtime home) ----
ACME_HOME="${ACME_HOME:-$PROJECT_DIR/data/acme}"
mkdir -p "$ACME_HOME"
if [[ ! -x "$ACME_HOME/acme.sh" ]]; then
    cp "$ACME_SYMLINK" "$ACME_HOME/acme.sh"
    chmod +x "$ACME_HOME/acme.sh"
fi

# ---- Webui symlinks (point to versioned files) ----
mkdir -p "$WEBUI_VENDOR"
WEBUI_LINKS=(
    "htm.js:../../../vendor/htm-${HTM_VERSION}.js"
)
for entry in "${WEBUI_LINKS[@]}"; do
    IFS=':' read -r name target <<< "$entry"
    ensure_symlink "${WEBUI_VENDOR}/${name}" "$target"
done

echo "[done] All libraries vendored."