using System.Text.Json;
using System.Text.Json.Serialization;

namespace MetaforceInstaller.Cloud.Implementations.MailRu.DTO;

public sealed class CloudObjectsResponse
{
    [JsonPropertyName("count")]
    public CountInfo? Count { get; init; }

    [JsonPropertyName("name")]
    public string? Name { get; init; }

    [JsonPropertyName("weblink")]
    public string? WebLink { get; init; }

    [JsonPropertyName("size")]
    public long? Size { get; init; }

    [JsonPropertyName("rev")]
    public long? Rev { get; init; }

    [JsonPropertyName("kind")]
    public string? Kind { get; init; }

    [JsonPropertyName("type")]
    public string? Type { get; init; }

    [JsonPropertyName("public")]
    public PublicInfo? Public { get; init; }

    [JsonPropertyName("list")]
    public List<CloudObjectBase>? List { get; init; }

    [JsonPropertyName("owner")]
    public OwnerInfo? Owner { get; init; }
}

public sealed class CountInfo
{
    [JsonPropertyName("folders")]
    public int? Folders { get; init; }

    [JsonPropertyName("files")]
    public int? Files { get; init; }
}

public sealed class PublicInfo
{
    [JsonPropertyName("type")]
    public string? Type { get; init; }

    [JsonPropertyName("name")]
    public string? Name { get; init; }

    [JsonPropertyName("id")]
    public string? Id { get; init; }

    [JsonPropertyName("ctime")]
    public long? CTime { get; init; }

    [JsonPropertyName("views")]
    public long? Views { get; init; }

    [JsonPropertyName("downloads")]
    public long? Downloads { get; init; }
}

public sealed class OwnerInfo
{
    [JsonPropertyName("email")]
    public string? Email { get; init; }

    [JsonPropertyName("user_flags")]
    public UserFlags? UserFlags { get; init; }
}

public sealed class UserFlags
{
    [JsonPropertyName("PAID_ACCOUNT")]
    public bool? PaidAccount { get; init; }
}

/// <summary>
/// Базовый тип элемента из "list". Конкретный тип выбирается по полю "type".
/// </summary>
[JsonConverter(typeof(CloudObjectJsonConverter))]
public abstract class CloudObjectBase
{
    [JsonPropertyName("name")]
    public string? Name { get; init; }

    [JsonPropertyName("weblink")]
    public string? WebLink { get; init; }

    [JsonPropertyName("size")]
    public long? Size { get; init; }

    [JsonPropertyName("kind")]
    public string? Kind { get; init; }

    [JsonPropertyName("type")]
    public string? Type { get; init; }
}

public sealed class CloudFolderObject : CloudObjectBase
{
    [JsonPropertyName("count")]
    public CountInfo? Count { get; init; }

    [JsonPropertyName("rev")]
    public long? Rev { get; init; }
}

public sealed class CloudFileObject : CloudObjectBase
{
    [JsonPropertyName("mtime")]
    public long? MTime { get; init; }

    [JsonPropertyName("hash")]
    public string? Hash { get; init; }
}

public sealed class ZipWebLinkRequest
{
    [JsonPropertyName("x-email")]
    public string XEmail { get; init; }
    
    [JsonPropertyName("weblink_list")]
    public IReadOnlyList<string> WeblinkList { get; init; }
    
    [JsonPropertyName("name")]
    public string Name { get; init; }
}

public sealed class ZipWebLinkResponse
{
    [JsonPropertyName("key")]
    public string Key { get; init; }
}

/// <summary>
/// Конвертер, который смотрит на поле "type" и десериализует в CloudFolderObject или CloudFileObject.
/// </summary>
public sealed class CloudObjectJsonConverter : JsonConverter<CloudObjectBase>
{
    public override CloudObjectBase Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        using var doc = JsonDocument.ParseValue(ref reader);

        var root = doc.RootElement;
        if (!root.TryGetProperty("type", out var typeProp))
            throw new JsonException("Missing required property 'type' for cloud object.");

        var type = typeProp.GetString();

        return type switch
        {
            "folder" => root.Deserialize<CloudFolderObject>(options)
                        ?? throw new JsonException("Failed to deserialize folder object."),
            "file" => root.Deserialize<CloudFileObject>(options)
                      ?? throw new JsonException("Failed to deserialize file object."),
            _ => throw new JsonException($"Unknown cloud object type '{type}'.")
        };
    }

    public override void Write(Utf8JsonWriter writer, CloudObjectBase value, JsonSerializerOptions options)
    {
        switch (value)
        {
            case CloudFolderObject folder:
                JsonSerializer.Serialize(writer, folder, options);
                break;
            case CloudFileObject file:
                JsonSerializer.Serialize(writer, file, options);
                break;
            default:
                throw new JsonException($"Unknown runtime type '{value.GetType().Name}'.");
        }
    }
}