#!/bin/bash
set -e

# Use a content-based hash of the webui dir to avoid unnecessary rebuilds.
OUTPUT_DIR="embedded/webui-dist"
# go:embed ignores files that start with a '.'
HASH_FILE="$OUTPUT_DIR/.input_hash"

calculate_input_hash() {
    local tmp=$(mktemp)
    (
        export GIT_INDEX_FILE="$tmp"
        git read-tree --empty
        git add webui/
        git write-tree
    )
    rm -f "$tmp"
}

CURRENT_HASH=$(calculate_input_hash)

if [ -f "$HASH_FILE" ] && [ -d "$OUTPUT_DIR" ]; then
    STORED_HASH=$(cat "$HASH_FILE")
    if [ "$CURRENT_HASH" = "$STORED_HASH" ]; then
        # No changes, skip rebuild
        exit 0
    fi
fi

rm -rf "$OUTPUT_DIR"
unset GOOS GOARCH && go run ./cmd/genwebui -- "$OUTPUT_DIR"
echo "$CURRENT_HASH" >"$HASH_FILE"