#!/bin/sh

# ---------------------------------------------------------------------------
# Install from your HA device's terminal:
#
#   curl -fsSL https://aevocam.com/ha-ins | sh
#
# Later uninstall via:
#
#   curl -fsSL https://aevocam.com/ha-unins | sh
#
# ---------------------------------------------------------------------------

set -eu

REPO_OWNER="JimCarnicelli"
REPO_NAME="aevocam-homeassistant"

COMPONENT_NAME="aevocam"

echo
echo "Aevocam Home Assistant Integration Installer"
echo "============================================="
echo

# ---------------------------------------------------------------------------
# Locate the Home Assistant configuration directory.
#
# Typical environments:
#
#   Home Assistant OS host:
#     /mnt/data/supervisor/homeassistant
#
#   Terminal/SSH add-on or similar environment:
#     /config
# ---------------------------------------------------------------------------

if [ -f "/config/configuration.yaml" ]; then
    HA_CONFIG="/config"
elif [ -f "/mnt/data/supervisor/homeassistant/configuration.yaml" ]; then
    HA_CONFIG="/mnt/data/supervisor/homeassistant"
else
    echo "ERROR: Could not locate the Home Assistant configuration directory."
    echo
    echo "Expected to find configuration.yaml in one of:"
    echo
    echo "  /config"
    echo "  /mnt/data/supervisor/homeassistant"
    echo
    echo "If your Home Assistant configuration is stored elsewhere,"
    echo "this installer cannot currently detect it automatically."
    exit 1
fi

echo "Home Assistant configuration:"
echo "  $HA_CONFIG"
echo

CUSTOM_COMPONENTS="$HA_CONFIG/custom_components"
INSTALL_DIR="$CUSTOM_COMPONENTS/$COMPONENT_NAME"

# ---------------------------------------------------------------------------
# Check required utilities.
# ---------------------------------------------------------------------------

for cmd in curl tar; do
    if ! command -v "$cmd" >/dev/null 2>&1; then
        echo "ERROR: Required command '$cmd' was not found."
        exit 1
    fi
done

# ---------------------------------------------------------------------------
# Work in a temporary directory.
# ---------------------------------------------------------------------------

TMP_BASE="${TMPDIR:-/tmp}"
TMP_DIR="$TMP_BASE/aevocam-ha-install-$$"

cleanup() {
    rm -rf "$TMP_DIR"
}

trap cleanup EXIT INT TERM

mkdir -p "$TMP_DIR"

ARCHIVE="$TMP_DIR/aevocam.tar.gz"
EXTRACT_DIR="$TMP_DIR/extracted"

mkdir -p "$EXTRACT_DIR"

# Resolve the latest GitHub release tag (installer script itself may come from
# main; the package always comes from the newest published release).
echo "Resolving latest release..."

RELEASE_API="https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/releases/latest"

TAG=$(
    curl \
        --fail \
        --location \
        --silent \
        --show-error \
        "$RELEASE_API" \
    | sed -n 's/^[[:space:]]*"tag_name"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' \
    | head -n 1
)

if [ -z "$TAG" ]; then
    echo "ERROR: Could not determine the latest release tag from GitHub."
    exit 1
fi

# GitHub archive directories replace '/' in tags with '-'.
ARCHIVE_ROOT="$REPO_NAME-$(echo "$TAG" | tr '/' '-')"
DOWNLOAD_URL="https://github.com/$REPO_OWNER/$REPO_NAME/archive/refs/tags/$TAG.tar.gz"

echo "Downloading Aevocam $TAG..."
echo

curl \
    --fail \
    --location \
    --silent \
    --show-error \
    "$DOWNLOAD_URL" \
    --output "$ARCHIVE"

echo "Extracting package..."

tar -xzf "$ARCHIVE" -C "$EXTRACT_DIR"

SOURCE_DIR="$EXTRACT_DIR/$ARCHIVE_ROOT/custom_components/$COMPONENT_NAME"

# ---------------------------------------------------------------------------
# Validate the downloaded package before touching the existing installation.
# ---------------------------------------------------------------------------

if [ ! -d "$SOURCE_DIR" ]; then
    echo "ERROR: Downloaded package does not contain:"
    echo "  custom_components/$COMPONENT_NAME"
    exit 1
fi

if [ ! -f "$SOURCE_DIR/manifest.json" ]; then
    echo "ERROR: Downloaded Aevocam integration has no manifest.json."
    exit 1
fi

if [ ! -f "$SOURCE_DIR/__init__.py" ]; then
    echo "ERROR: Downloaded Aevocam integration has no __init__.py."
    exit 1
fi

# Basic sanity check that we really downloaded the Aevocam integration.
if ! grep -q '"domain"[[:space:]]*:[[:space:]]*"aevocam"' \
    "$SOURCE_DIR/manifest.json"; then

    echo "ERROR: Downloaded manifest.json does not identify the"
    echo "Aevocam integration."
    exit 1
fi

echo "Package looks valid."
echo

# ---------------------------------------------------------------------------
# Install.
# ---------------------------------------------------------------------------

mkdir -p "$CUSTOM_COMPONENTS"

# Build the new tree aside, then swap it into place. Keep the previous
# install only until the swap succeeds, then delete it (no lasting backup).
STAGING_DIR="$CUSTOM_COMPONENTS/.aevocam-installing"
OLD_DIR="$CUSTOM_COMPONENTS/.aevocam-old"

rm -rf "$STAGING_DIR" "$OLD_DIR"
cp -R "$SOURCE_DIR" "$STAGING_DIR"

if [ -d "$INSTALL_DIR" ]; then
    echo "Replacing existing installation..."
    mv "$INSTALL_DIR" "$OLD_DIR"
fi

mv "$STAGING_DIR" "$INSTALL_DIR"
rm -rf "$OLD_DIR"

# Leftover from older installer versions that kept aevocam.backup.
rm -rf "$CUSTOM_COMPONENTS/aevocam.backup"
sync

echo "Aevocam installed successfully."
echo
echo "Installed at:"
echo "  $INSTALL_DIR"
echo
echo "Next:"
echo
echo "  1. Restart Home Assistant."
echo "  2. Open Settings -> Devices & services."
echo "  3. Select Add Integration."
echo "  4. Search for Aevocam."
echo