#!/bin/bash
# Build/fetch SQLite amalgamation for embedding
# Mirrors the rsync pattern: assets/sqlite_release_<os>_<arch>/

set -euo pipefail

SQLITE_VERSION="${SQLITE_VERSION:-3450000}"  # 3.45.0
SQLITE_YEAR="${SQLITE_YEAR:-2024}"
SQLITE_SRC_BASE="${SQLITE_SRC_BASE:-https://www.sqlite.org/${SQLITE_YEAR}}"

os="$(uname -s | tr '[:upper:]' '[:lower:]')"
arch="$(uname -m)"
if [[ "${arch}" == "aarch64" || "${arch}" == "arm64" ]]; then arch="arm64"; fi
if [[ "${arch}" == "x86_64" ]]; then arch="x86_64"; fi

repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
out_dir="${repo_root}/src/assets/sqlite_release_${os}_${arch}"

echo "Building SQLite ${SQLITE_VERSION} for ${os}/${arch}..."

# Create output directory
mkdir -p "${out_dir}"

# Download if not present
if [[ ! -f "${out_dir}/sqlite3.c" ]]; then
    echo "Fetching SQLite amalgamation..."
    tmp="$(mktemp -d)"
    cleanup() { rm -rf "${tmp}"; }
    trap cleanup EXIT
    
    url="${SQLITE_SRC_BASE}/sqlite-amalgamation-${SQLITE_VERSION}.zip"
    echo "Fetching ${url}"
    curl -fsSL "${url}" -o "${tmp}/sqlite.zip"
    
    unzip -q "${tmp}/sqlite.zip" -d "${tmp}"
    mv "${tmp}/sqlite-amalgamation-${SQLITE_VERSION}"/* "${out_dir}/"
    
    echo "✓ SQLite fetched to ${out_dir}"
else
    echo "✓ SQLite already present at ${out_dir}"
fi

# Verify
if [[ -f "${out_dir}/sqlite3.c" && -f "${out_dir}/sqlite3.h" ]]; then
    echo "✓ SQLite ready:"
    ls -lh "${out_dir}/sqlite3.c" "${out_dir}/sqlite3.h"
else
    echo "Error: SQLite files not found in ${out_dir}"
    exit 1
fi