diff_json

#!/bin/bash

die() { printf %s "${@+$@$'\n'}" 1>&2 ; exit 1 ; }
see() ( { set -x; } 2>/dev/null ; "$@" )


# Function to normalize JSON
normalize_json() {
    local file="$1"
    local sort_arrays="$2"
    local keys="$3"  # Comma-separated list of keys or key paths

    local jq_filter=''
    if [[ -n "$keys" ]]; then
        # Create a jq filter to select specified keys
        IFS=',' read -ra key_array <<< "$keys"
        for key in "${key_array[@]}"; do
            if [[ -n "$jq_filter" ]]; then
                jq_filter+=", "
            fi
            jq_filter+="\"$key\": .$key"
        done
        jq_filter="{$jq_filter}"
    else
        jq_filter='.'
    fi

    if [[ "$sort_arrays" != "n" ]]; then
       sort_arrays="| sort_by(.)"
    fi
    jq -S "
        def normalize:
          if type == \"array\" then
            [.[] | normalize] | $sort_arrays
          elif type == \"object\" then
            to_entries
            | map({key: .key, value: .value | normalize})
            | from_entries
          else
            .
          end;
        $jq_filter | normalize
    " "$file"
}

diff_json() {
    test -d "$1" || die "$1 is not a dir"
    test -d "$2" || die "$2 is not a dir"
    local f1="$1/$3" ; test -f "$f1" || die "$f1 is not a file"
    local f2="$2/$3" ; test -f "$f2" || die "$f2 is not a file"

    local sort_arrays="${4:-n}"
    local keys="$5"

    if [[ -n "$keys" ]]; then
        printf 'only keys: %s\n' "$keys"
    fi
    printf '\n'
    diff -u \
        --label "$f1" --label "$f2" \
        <(normalize_json "$f1" "$sort_arrays" "$keys") \
        <(normalize_json "$f2" "$sort_arrays" "$keys")
}

diff_json "$1" "$2" "package.json"   n "dependencies,devDependencies"
diff_json "$1" "$2" "tsconfig.json"  y "compilerOptions.strict,compilerOptions.target"