using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using System.Globalization;
using System.Security.Cryptography;
using System.Text.Json;
using DorkNet.Server.Auth;
using DorkNet.Server.Data;
using DorkNet.Server.Data.Entities;

namespace DorkNet.Server.Controllers.API.Compatibility;

[ApiController]
public class CompatibilityFeatureController(DorkNetDbContext db) : ControllerBase
{
    /// <summary>The 2023-03-21 client GETs this (verb register <c>rdx=0</c>
    /// at RecNet.Runtime/FPIBGPIAOBI.txt:2984, immediately before the
    /// <c>"api/banappeal/generateCode"</c> literal on :2980) and deserialises
    /// the response as a bare <c>String</c> — the issuing method is
    /// <c>FGLDKEJLAKB&lt;System.String&gt; HBEPHMAKCDN()</c> (:2759) and the
    /// continuation is <c>Func&lt;IPCJLCNIBEG&lt;String&gt;,
    /// FGLDKEJLAKB&lt;String&gt;&gt;</c> (:3019).
    ///
    /// It used to be POST-only returning <c>{value: code}</c>, so the client
    /// got a 405 and, had it reached the handler, would have thrown parsing a
    /// JSON object into a string. Ban-appeal code generation never worked.
    /// The body is now the bare JSON string (<c>"BA-123456"</c>).</summary>
    [HttpGet("api/banappeal/generateCode")]
    [HttpPost("api/banappeal/generateCode")]
    [Authorize]
    public async Task<IActionResult> GenerateBanAppealCode()
    {
        var pid = this.RequireCurrentPlayerId();
        var code = $"BA-{RandomNumberGenerator.GetInt32(100000, 999999)}";
        db.PlayerSettings.Add(new PlayerSettingEntity
        {
            PlayerId = pid,
            Key = $"banappeal:{DateTime.UtcNow:yyyyMMddHHmmss}",
            Value = code,
        });
        await db.SaveChangesAsync();
        return Content(JsonSerializer.Serialize(code), "application/json");
    }

    [HttpPost("api/CampusCard/v1/UpdateAndGetSubscription")]
    [Authorize]
    [Consumes("application/json", "application/x-www-form-urlencoded", "multipart/form-data")]
    public async Task<IActionResult> UpdateAndGetCampusCardSubscription()
    {
        var pid = this.RequireCurrentPlayerId();
        var req = await ReadCampusCardRequestAsync();
        var targetId = req.PlatformAccountSubscribedPlayerId > 0
            ? req.PlatformAccountSubscribedPlayerId
            : pid;

        if (targetId != pid && req.Subscription)
        {
            var exists = await db.Subscriptions.AnyAsync(s =>
                s.SubscriberPlayerId == pid && s.TargetPlayerId == targetId);
            if (!exists)
            {
                db.Subscriptions.Add(new SubscriptionEntity
                {
                    SubscriberPlayerId = pid,
                    TargetPlayerId = targetId,
                });
                await db.SaveChangesAsync();
            }
        }
        else if (targetId != pid && !req.Subscription)
        {
            await db.Subscriptions
                .Where(s => s.SubscriberPlayerId == pid && s.TargetPlayerId == targetId)
                .ExecuteDeleteAsync();
        }

        var active = targetId == pid || await db.Subscriptions.AnyAsync(s =>
            s.SubscriberPlayerId == pid && s.TargetPlayerId == targetId);
        var now = DateTime.UtcNow;
        var subscriptionId = unchecked((pid * 397L) ^ targetId);
        var subscription = new Dictionary<string, object?>
        {
            ["subscriptionId"] = subscriptionId,
            ["recNetPlayerId"] = pid,
            ["platformAccountSubscribedPlayerId"] = targetId,
            ["isActive"] = active,
            ["startedAt"] = now,
            ["currentPeriodEnd"] = active ? now.AddYears(10) : now,
            ["renewalDate"] = active ? now.AddYears(10) : now,
            ["SubscriptionId"] = subscriptionId,
            ["RecNetPlayerId"] = pid,
            ["PlatformAccountSubscribedPlayerId"] = targetId,
            ["IsActive"] = active,
            ["StartedAt"] = now,
            ["CurrentPeriodEnd"] = active ? now.AddYears(10) : now,
            ["RenewalDate"] = active ? now.AddYears(10) : now,
        };

        return Ok(new Dictionary<string, object?>
        {
            ["subscription"] = subscription,
            ["platformAccountSubscribedPlayerId"] = targetId,
            ["Subscription"] = subscription,
            ["PlatformAccountSubscribedPlayerId"] = targetId,
        });
    }

    [HttpGet("api/CampusCard/PS5RecRoomPlusEnabledForAllPlayers")]
    [AllowAnonymous]
    public IActionResult Ps5RecRoomPlusEnabledForAllPlayers()
        => Content("true", "application/json");

    /// <summary>The 2023-03-21 client POSTs this — the request is built at
    /// RecNet.Runtime/GAAPALMODOL.txt:104-106, where the route literal
    /// <c>"api/AppIntegrity/v1/iosproducts"</c> goes into <c>r9</c> and the
    /// verb register <c>rdx=2</c> = <c>BestHTTP.HTTPMethods.Post</c> (host
    /// <c>r8=1</c>). The payload is a RAW JSON body — the serialized list is
    /// handed to <c>BNDIAONDFFF.FJLLPHFOOJJ</c> (:138), not the
    /// form-parameter helper — holding
    /// <c>List&lt;GAAPALMODOL/KOLPHINEHDD&gt;</c>, i.e. a top-level array of
    /// {Name:String, Price:Single, ProductId:String} (getters at
    /// GAAPALMODOL_NestedType_KOLPHINEHDD.txt:3/25/45; formatter key table,
    /// which also accepts camel/lower spellings, at KAONMCEONPF.txt:255-306).
    /// The issuing method's return type is
    /// <c>FGLDKEJLAKB&lt;PHMHCPEMABG&gt;</c> (:3) and PHMHCPEMABG is
    /// {Boolean, String} (PHMHCPEMABG.txt:3/23) keyed
    /// <c>Success</c>/<c>Message</c> (GBPDOLJBABB.txt:191-218).
    ///
    /// <see cref="DorkNet.Server.Controllers.API.AppIntegrity.AppIntegrityController"/>
    /// registers the same
    /// path GET-only, so the client's POST hit a 405 and the StoreKit
    /// price report was dropped. Registering only the POST verb here leaves
    /// that GET (and its consumers) untouched — the two never collide
    /// because the method constraints are disjoint.
    ///
    /// The reported catalogue is what Apple's StoreKit resolved on the
    /// device, so it is inherently per-account/per-storefront: it is
    /// persisted as the reporting player's <c>appintegrity:iosproducts</c>
    /// setting (same PlayerSettings convention as the ban-appeal handler
    /// above), replacing any earlier report. Only a malformed body answers
    /// Success=false; the client shows nothing on success and PHMHCPEMABG's
    /// Message is left empty.</summary>
    [HttpPost("api/AppIntegrity/v1/iosproducts")]
    [Authorize]
    public async Task<IActionResult> IosProducts()
    {
        var pid = this.RequireCurrentPlayerId();

        List<IosProduct>? products;
        try
        {
            products = await JsonSerializer.DeserializeAsync<List<IosProduct>>(
                Request.Body,
                new JsonSerializerOptions { PropertyNameCaseInsensitive = true });
        }
        catch (JsonException)
        {
            return IosProductsResult(false, "malformed_product_list");
        }

        if (products is null) return IosProductsResult(false, "malformed_product_list");

        // "{productId}={price}" pairs rather than the raw JSON: the
        // localized Name adds nothing a server-side reader needs and
        // PlayerSettingEntity.Value caps at 1024 chars, so entries are
        // dropped (never truncated mid-pair) once the budget is spent.
        var parts = new List<string>();
        var length = 0;
        foreach (var p in products)
        {
            var productId = p.ProductId?.Trim();
            if (string.IsNullOrEmpty(productId)) continue;
            var pair = $"{productId}={p.Price.ToString(CultureInfo.InvariantCulture)}";
            var cost = parts.Count == 0 ? pair.Length : pair.Length + 1;
            if (length + cost > 1024) break;
            parts.Add(pair);
            length += cost;
        }

        const string key = "appintegrity:iosproducts";
        var row = await db.PlayerSettings
            .FirstOrDefaultAsync(s => s.PlayerId == pid && s.Key == key);
        if (row is null)
        {
            db.PlayerSettings.Add(new PlayerSettingEntity
            {
                PlayerId = pid,
                Key = key,
                Value = string.Join(';', parts),
            });
        }
        else
        {
            row.Value = string.Join(';', parts);
        }
        await db.SaveChangesAsync();

        return IosProductsResult(true, string.Empty);
    }

    /// <summary>PHMHCPEMABG accepts PascalCase, camelCase and all-lowercase
    /// key spellings (GBPDOLJBABB.txt:191-218), so either casing alone would
    /// satisfy it; both are emitted for the same reason the CampusCard
    /// payload above does. Dictionary keys go out verbatim — the global
    /// serializer sets PropertyNamingPolicy = null
    /// (Startup/ServiceCollectionExtensions.cs:381).</summary>
    private IActionResult IosProductsResult(bool success, string message)
        => Ok(new Dictionary<string, object?>
        {
            ["Success"] = success,
            ["Message"] = message,
            ["success"] = success,
            ["message"] = message,
        });

    [HttpPost("api/clubreporting/v1/report")]
    [Authorize]
    [Consumes("application/json", "application/x-www-form-urlencoded", "multipart/form-data")]
    public async Task<IActionResult> ClubReport()
    {
        var pid = this.RequireCurrentPlayerId();
        var req = await ReadClubReportAsync();
        var club = req.ClubId > 0
            ? await db.Clubs.FirstOrDefaultAsync(c => c.Id == req.ClubId)
            : null;
        if (club is null) return Ok(new { Success = false, Message = "club_not_found" });

        // Prefix with "[club {id}]" so admins can tell club reports apart
        // from player reports in the shared ReportEntity queue.
        var message = $"[club {club.Id}] {req.Details ?? req.Message ?? string.Empty}".Trim();
        if (message.Length > 1000) message = message[..1000];
        db.Reports.Add(new ReportEntity
        {
            ReporterPlayerId = pid,
            TargetPlayerId = club.CreatorPlayerId,
            Category = req.ReportCategory,
            Message = message,
        });
        await db.SaveChangesAsync();
        return Ok(new { Success = true, Message = string.Empty });
    }

    private async Task<CampusCardRequest> ReadCampusCardRequestAsync()
    {
        if (Request.HasFormContentType)
        {
            var form = await Request.ReadFormAsync();
            return new CampusCardRequest
            {
                Subscription = bool.TryParse(form["subscription"].FirstOrDefault(), out var s) && s,
                PlatformAccountSubscribedPlayerId = long.TryParse(
                    form["platformAccountSubscribedPlayerId"].FirstOrDefault(), out var id) ? id : 0,
            };
        }
        try
        {
            return await JsonSerializer.DeserializeAsync<CampusCardRequest>(
                Request.Body,
                new JsonSerializerOptions { PropertyNameCaseInsensitive = true }) ?? new CampusCardRequest();
        }
        catch (JsonException) { return new CampusCardRequest(); }
    }

    private async Task<ClubReportRequest> ReadClubReportAsync()
    {
        if (Request.HasFormContentType)
        {
            var form = await Request.ReadFormAsync();
            return new ClubReportRequest
            {
                ClubId = long.TryParse(form["clubId"].FirstOrDefault()
                                       ?? form["ClubId"].FirstOrDefault(), out var clubId) ? clubId : 0,
                ReportCategory = int.TryParse(form["reportCategory"].FirstOrDefault()
                                              ?? form["ReportCategory"].FirstOrDefault(), out var cat) ? cat : 5,
                // The 2023 client names the free-text field "details"
                // (IKMMOCKDKAF.txt:25303-25322), not "message" — reading only
                // the latter stored every club report with an empty body.
                Message = form["details"].FirstOrDefault()
                          ?? form["Details"].FirstOrDefault()
                          ?? form["message"].FirstOrDefault()
                          ?? form["Message"].FirstOrDefault(),
            };
        }
        try
        {
            return await JsonSerializer.DeserializeAsync<ClubReportRequest>(
                Request.Body,
                new JsonSerializerOptions { PropertyNameCaseInsensitive = true }) ?? new ClubReportRequest();
        }
        catch (JsonException) { return new ClubReportRequest(); }
    }

    private sealed class CampusCardRequest
    {
        public bool Subscription { get; set; }
        public long PlatformAccountSubscribedPlayerId { get; set; }
    }

    /// <summary>One entry of the client's raw JSON array —
    /// GAAPALMODOL/KOLPHINEHDD, whose three properties are String, Single,
    /// String in that field order (offsets 0x10/0x18/0x20 in
    /// GAAPALMODOL_NestedType_KOLPHINEHDD.txt) and whose formatter writes
    /// the keys Name / Price / ProductId (KAONMCEONPF.txt:321-360).</summary>
    private sealed class IosProduct
    {
        public string? Name { get; set; }
        public float Price { get; set; }
        public string? ProductId { get; set; }
    }

    private sealed class ClubReportRequest
    {
        public long ClubId { get; set; }
        public int ReportCategory { get; set; } = 5;
        public string? Message { get; set; }
        /// <summary>The client's spelling of <see cref="Message"/>.</summary>
        public string? Details { get; set; }
    }
}