#!/usr/bin/env bash
set -euo pipefail

# TubeSync development environment setup script
# Usage: ./scripts/setup-dev.sh

REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
PYTHON="${PYTHON:-python3}"

# Fail fast if Python is too old (Django 6 requires 3.10+)
"${PYTHON}" -c 'import sys; v=sys.version_info; (v.major==3 and v.minor>=10) or (print(f"Error: Python 3.10+ required for Django 6. Found {v.major}.{v.minor}", file=sys.stderr), sys.exit(1))' || exit 1

echo "==> Setting up TubeSync dev environment"
echo "    Python: $($PYTHON --version)"
echo "    Repo:   $REPO_ROOT"
echo

# 1. Create a virtualenv if not already in one
if [ -z "${VIRTUAL_ENV:-}" ]; then
    echo "==> Creating virtualenv in .venv/"
    $PYTHON -m venv "$REPO_ROOT/.venv"
    source "$REPO_ROOT/.venv/bin/activate"
    echo "    Activated .venv"
else
    echo "==> Using existing virtualenv: $VIRTUAL_ENV"
fi

# 2. Install dependencies
echo "==> Installing dependencies from requirements.txt"
pip install --upgrade pip -q
pip install -r "$REPO_ROOT/requirements.txt" -q
pip install -r "$REPO_ROOT/requirements-dev.txt" -q
echo "    Done"

# 3. Apply yt-dlp patches
echo "==> Applying yt-dlp patches"
SITE_PACKAGES="$(python -c 'import sysconfig; print(sysconfig.get_paths()["purelib"])')"
cp -a "$REPO_ROOT/patches/yt_dlp/"* "$SITE_PACKAGES/yt_dlp/"
echo "    Patched yt_dlp in $SITE_PACKAGES"

# 4. Copy local settings if missing
if [ ! -f "$REPO_ROOT/tubesync/tubesync/local_settings.py" ]; then
    echo "==> Copying local_settings.py.example"
    cp "$REPO_ROOT/tubesync/tubesync/local_settings.py.example" \
       "$REPO_ROOT/tubesync/tubesync/local_settings.py"
else
    echo "==> local_settings.py already exists, skipping"
fi

# 5. Download Tailwind CSS CLI if not present (verified via asfald)
if [ ! -x "$REPO_ROOT/tailwindcss" ]; then
    echo "==> Downloading Tailwind CSS CLI (with asfald checksum verification)"
    ARCH="$(uname -m)"
    OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
    case "$(uname -s)" in
        Darwin) OS='macos' ;;
        Linux) OS='linux' ;;
    esac
    case "$(uname -m)" in
        aarch64|arm64) ARCH='arm64' ;;
        x86_64) ARCH='x64' ;;
    esac
    case "${OS}-${ARCH}" in
        macos-arm64|macos-x64|linux-arm64|linux-x64)  TW_BIN="tailwindcss-${OS}-${ARCH}" ;;
        *)             echo "    Unsupported platform: $OS-$ARCH"; TW_BIN="" ;;
    esac
    if [ -n "$TW_BIN" ]; then
        asfald_uri='asfaload/asfald/releases/download/v0.6.0'
        case "${OS}-${ARCH}" in
            (linux-arm64) fn='asfald-aarch64-unknown-linux-musl.tar.gz' ;;
            (linux-x64) fn='asfald-x86_64-unknown-linux-musl.tar.gz' ;;
            (macos-arm64) fn='asfald-aarch64-apple-darwin.tar.gz' ;;
            (macos-x64) fn='asfald-x86_64-apple-darwin.tar.gz' ;;
        esac
        extract_asfald() {
            local gtar=; case "$(tar --version 2>/dev/null)" in (*'(GNU tar)'*) gtar=t;; esac; tar --strip-components=1 ${gtar:+--wildcards} -xvvpf "${1}" 'asfald-*/asfald';
        }
        curl -sSLO -- "https://github.com/${asfald_uri}/${fn}"
        curl -sSL -- "https://gh.checksums.asfaload.com/github.com/${asfald_uri}/checksums.txt" | "${PYTHON}" "${REPO_ROOT}/tubesync/shasum.py" -a sha256 - &&
            extract_asfald "${fn}" &&
            TMPDIR="$(mktemp -d "${REPO_ROOT}/.tmp.XXXXXXXX")" ./asfald -o "${REPO_ROOT}/tailwindcss" -p '${path}/sha256sums.txt' "https://github.com/tailwindlabs/tailwindcss/releases/latest/download/${TW_BIN}"
        rm -v -f "${fn}" ./asfald
        unset -v asfald_uri fn
        rmdir -v "${REPO_ROOT}"/.tmp.* 2>/dev/null || true
        chmod -v a+rx "${REPO_ROOT}/tailwindcss"
        echo "    Downloaded and verified $TW_BIN"
    fi
else
    echo "==> Tailwind CSS CLI already present"
fi

# 6. Compile Tailwind CSS
echo "==> Compiling Tailwind CSS"
"$REPO_ROOT/tailwindcss" --input "$REPO_ROOT/tubesync/common/static/styles/tailwind/tubesync.css" --output "$REPO_ROOT/tubesync/common/static/styles/tailwind/tubesync-compiled.css" --cwd "$REPO_ROOT"

# 7. Run migrations
echo "==> Running database migrations"
$PYTHON "$REPO_ROOT/tubesync/manage.py" migrate --run-syncdb -v 0

# 8. Collect static files
echo "==> Collecting static files"
$PYTHON "$REPO_ROOT/tubesync/manage.py" collectstatic --noinput -v 0

echo
echo "==> Setup complete!"
echo "    Activate the virtualenv:  source .venv/bin/activate"
echo "    Run the dev server:       cd tubesync && python manage.py runserver"
echo "    Run tests:                cd tubesync && python manage.py test --verbosity=2"