using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var placeholders = GetExamplePlaceholders();

        var pagePayloadObject = GetExamplePagePayload();

        var serializedPagePayloadObject = JsonConvert.SerializeObject(pagePayloadObject);

        Console.WriteLine(serializedPagePayloadObject);

        serializedPagePayloadObject = ReplacePlaceholderValues(serializedPagePayloadObject, placeholders);

        Console.WriteLine("");

        Console.WriteLine("*********************************************");

        Console.WriteLine("");

        var deserializedPagePayloadObject = JsonConvert.DeserializeObject(serializedPagePayloadObject);

        Console.WriteLine(deserializedPagePayloadObject);

    }

    private static string ReplacePlaceholderValues(string source, Dictionary<string, string> placeholders)

    {

        var replacedText = placeholders.Aggregate(source, (current, replacement) =>

        {

            return current.Replace(replacement.Key, replacement.Value);

        });

        return replacedText;

     }

    private static PagePayload GetExamplePagePayload()

    {

        var dummyContentBlocks = new List<ContentBlock>();

        for (var i = 1; i <= 3; i++)

        {

            dummyContentBlocks.Add(GenerateDummyContentBlock(i));

        }

        return new PagePayload

        {

            ContentBlocks = dummyContentBlocks,

            AltContentBlocks = dummyContentBlocks,

            BasicContent = "<p>Some other html content that may or may not contain placeholders: \"[!BasicPlaceholder]\"</p>",

            BasicContentAlt = "<p>Another placeholder: \"[!Placeholder1]\"</p>"

        };

    }

    private static Dictionary<string, string> GetExamplePlaceholders()

    {

        return new Dictionary<string, string>()

        {

            { "[!Placeholder1]", "<p>Some text which contains a nested placeholder: \"[!NestedPlaceholder1]\"</p>" },

            { "[!NestedPlaceholder1]", "<span>Nested Placeholder 1 value, contains another placeholder: \"[!NestedPlaceholder2]\"</span>" },

            { "[!NestedPlaceholder2]", "A Simple string with no html content" },

            { "[!BaseUrl]", "https://example.com" },

            { "[!BasicPlaceholder]", "More simple text" }

        };

    }

    private static ContentBlock GenerateDummyContentBlock(int id)

    {

        return new ContentBlock

        {

            Title = "Smart Marketing Block Title " + id.ToString(),

            Description = "Smart Marketing Block Description " + id.ToString(),

            Link = GenerateDummyLink(id)

        };

    }

    private static Link GenerateDummyLink(int id)

    {

        return new Link

        {

            Name = "Link Name " + id.ToString(),

            Url = "[!BaseUrl]/a-relative-page"

        };

    }

    public class PagePayload

    {

        public IEnumerable<ContentBlock> ContentBlocks { get; set; }

        public IEnumerable<ContentBlock> AltContentBlocks { get; set; }

        public string BasicContent { get; set ; }

        public string BasicContentAlt { get; set ; }

    }

    public class ContentBlock

    {

        public string Title { get; set; }

        public string Description { get; set; }

        public Link Link { get; set; }

        public string ImageUrl { get; set; }

        public string ImageAltText { get; set; }

    }

    public class Link

    {

        public string Name { get; set; }

        public string Url { get; set; }

    }

}