using System.Text.Json;
using System.Text.Json.Serialization;
using Prospect.Server.Api.Services.Auth.Extensions;
using Prospect.Server.Api.Services.CloudScript;
using Prospect.Server.Api.Services.CloudScript.Functions;
using Prospect.Server.Api.Services.CloudScript.Models;
using Prospect.Server.Api.Services.UserData;

// Closed Beta Function

public class CompleteInventoryUpdateRequest
{
    [JsonPropertyName("userId")]
    public string UserID { get; set; }
    [JsonPropertyName("reason")]
    public string Reason { get; set; }
    [JsonPropertyName("newSet")]
    public LoadoutData NewSet { get; set; }
    [JsonPropertyName("itemsToAdd")]
    public FYCustomItemInfo[] ItemsToAdd { get; set; }
    [JsonPropertyName("itemsToUpdateAmount")]
    public FYCustomItemInfo[] ItemsToUpdateAmount { get; set; }
    [JsonPropertyName("itemsToRemove")]
    public HashSet<string> ItemsToRemove { get; set; }
}

public class CompleteInventoryUpdateResponse
{
    [JsonPropertyName("userId")]
    public string UserId { get; set; }
    [JsonPropertyName("error")]
    public string Error { get; set; }
    [JsonPropertyName("newSet")]
    public LoadoutData NewSet { get; set; }
    [JsonPropertyName("itemsToAdd")]
    public FYCustomItemInfo[] ItemsToAdd { get; set; }
    [JsonPropertyName("itemsToUpdateAmount")]
    public FYCustomItemInfo[] ItemsToUpdateAmount { get; set; }
    [JsonPropertyName("itemsToRemove")]
    public HashSet<string> ItemsToRemove { get; set; }
}

[CloudScriptFunction("CompleteInventoryUpdate")]
public class CompleteInventoryUpdateFunction : ICloudScriptFunction<CompleteInventoryUpdateRequest, CompleteInventoryUpdateResponse>
{
    private readonly ILogger<CompleteInventoryUpdateFunction> _logger;
    private readonly IHttpContextAccessor _httpContextAccessor;
    private readonly UserDataService _userDataService;
    private readonly TitleDataService _titleDataService;

    public CompleteInventoryUpdateFunction(ILogger<CompleteInventoryUpdateFunction> logger, IHttpContextAccessor httpContextAccessor, UserDataService userDataService, TitleDataService titleDataService)
    {
        _logger = logger;
        _httpContextAccessor = httpContextAccessor;
        _userDataService = userDataService;
        _titleDataService = titleDataService;
    }

    public async Task<CompleteInventoryUpdateResponse> ExecuteAsync(CompleteInventoryUpdateRequest request)
    {
        var context = _httpContextAccessor.HttpContext;
        if (context == null)
        {
            throw new CloudScriptException("CloudScript was not called within a http request");
        }
        var userId = context.User.FindAuthUserId();
        var userData = await _userDataService.FindAsync(userId, userId, new List<string>{"Inventory"});
        var inventory = JsonSerializer.Deserialize<List<FYCustomItemInfo>>(userData["Inventory"].Value);

        // Insurance payout: this request also reports the end-of-match inventory, so items
        // the player lost (death / left behind) arrive in ItemsToRemove. Any of those that
        // were insured on deploy (EnterMatchmakingStation) are recovered back to the stash —
        // the premium was already paid up-front — and the insurance is consumed (one raid).
        // Recovery is only performed if the item's policy declares a positive Payout.
        var recoveredInsured = new HashSet<string>();
        if (request.ItemsToRemove is { Count: > 0 })
        {
            try
            {
                var td = _titleDataService.Find(new List<string> { "InventoryInsurance" });
                if (td.TryGetValue("InventoryInsurance", out var rawPolicies) && !string.IsNullOrEmpty(rawPolicies))
                {
                    var policies = JsonSerializer.Deserialize<Dictionary<string, InventoryInsurancePolicy>>(rawPolicies);
                    foreach (var item in inventory)
                    {
                        if (!request.ItemsToRemove.Contains(item.ItemId)) continue;
                        if (string.IsNullOrEmpty(item.Insurance) || item.InsuranceOwnerPlayfabId != userId) continue;
                        if (policies == null || !policies.TryGetValue(item.Insurance, out var policy) || policy.Payout <= 0) continue;
                        recoveredInsured.Add(item.ItemId);
                        item.Insurance = "";              // consumed for this raid
                        item.InsuranceOwnerPlayfabId = "";
                    }
                    if (recoveredInsured.Count > 0)
                    {
                        _logger.LogInformation("Recovered {Count} insured item(s) for user {User}", recoveredInsured.Count, userId);
                    }
                }
            }
            catch (Exception e)
            {
                // Never fail the inventory commit because of insurance handling.
                _logger.LogWarning(e, "Failed to process insurance payout");
            }
        }

        // TODO: Optimize
        // TODO: Check deleted items to see if other stacks/mods were updated correctly
        // Process inventory update. The player may:
        // 1. Split item stack - creates a new item and updates amount of existing item.
        // 2. Stack existing items - deletes existing items and updates amount of existing item.
        // 3. Change vanity data - updates an existing item.
        // 4. Change weapon mods - updates an existing item.
        // IMPORTANT: The same request is currently used to report the updated inventory in the end of match.
        var newInventory = new List<FYCustomItemInfo>(inventory.Count);
        foreach (var item in inventory) {
            // Keep items that weren't removed, plus insured items recovered above.
            if (!request.ItemsToRemove.Contains(item.ItemId) || recoveredInsured.Contains(item.ItemId)) {
                newInventory.Add(item);
            }
        }

        foreach (var item in request.ItemsToUpdateAmount) {
            var inventoryItem = newInventory.Find(i => i.ItemId == item.ItemId);
            if (inventoryItem == null) {
                continue;
            }
            inventoryItem.Amount = item.Amount;
            inventoryItem.ModData = item.ModData;
            inventoryItem.PrimaryVanityId = item.PrimaryVanityId;
            inventoryItem.SecondaryVanityId = item.SecondaryVanityId;
            inventoryItem.Durability = item.Durability;
        }

        // TODO: Check updated items and validate new items
        foreach (var item in request.ItemsToAdd) {
            newInventory.Add(item);
        }

        await _userDataService.UpdateAsync(userId, userId, new Dictionary<string, string>{
            ["LOADOUT"] = JsonSerializer.Serialize(request.NewSet),
            ["Inventory"] = JsonSerializer.Serialize(newInventory),
        });

        return new CompleteInventoryUpdateResponse
        {
            UserId = userId,
            //Error = "",
            //NewSet = request.NewSet,
            //ItemsToAdd = request.ItemsToAdd,
            //ItemsToRemove = request.ItemsToRemove,
            //ItemsToUpdateAmount = request.ItemsToUpdateAmount,
        };
    }
}