using System.Text.Json;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using RadicadeServer.DB;
using RadicadeServer.Extensions;
using RadicadeServer.RecNet.Accounts;
using RadicadeServer.RecNet.Avatar;

namespace RadicadeServer.API.Avatars.V1;

[Route("api/equipment/v1")]
[Route("econ/api/equipment/v1")]
[Authorize]
public class EquipmentV1(RecDBContext db) : Controller
{
    [HttpPost("update")]
    [HttpPut("update")]
    public async Task<IActionResult> UpdateEquipment([FromBody] JsonElement body)
    {
        var userId = User.GetUserId();
        if (userId == null) return Unauthorized();

        if (!TryParse(body, out var entries))
            return BadRequest();

        var slots = entries.Where(entry => entry.HasSlot).ToList();
        var favourites = entries.Where(entry => entry.Favorited.HasValue).ToList();
        if (slots.Count == 0 && favourites.Count == 0)
            return Ok();

        if (slots.Count > 0)
        {
            var avatar = await db.Avatars.FirstOrDefaultAsync(x => x.AccountId == userId);
            if (avatar != null)
            {
                avatar.EquipmentSlots = slots.Select(entry => (object)new
                {
                    slotIndex = entry.SlotIndex,
                    equipmentPrefabName = entry.PrefabName ?? string.Empty,
                    equipmentModificationGuid = entry.ModificationGuid ?? string.Empty
                }).ToList().ToJson();
            }
        }

        if (favourites.Count > 0)
            await ApplyFavouritesAsync(userId.Value, favourites);

        await db.SaveChangesAsync();

        return Ok();
    }

    private async Task ApplyFavouritesAsync(long userId, List<EquipmentUpdate> favourites)
    {
        var unlocks = await db.Unlocks.FirstOrDefaultAsync(x => x.AccountId == userId);
        if (unlocks == null)
        {
            unlocks = new PlayerUnlocks { AccountId = userId };
            db.Unlocks.Add(unlocks);
        }

        List<Equipment> equipment;
        try
        {
            equipment = unlocks.GetEquipment() ?? new List<Equipment>();
        }
        catch (JsonException)
        {
            equipment = new List<Equipment>();
        }

        foreach (var update in favourites)
        {
            if (string.IsNullOrWhiteSpace(update.ModificationGuid)) continue;

            var row = equipment.FirstOrDefault(item => string.Equals(
                item.ModificationGuid, update.ModificationGuid, StringComparison.OrdinalIgnoreCase));

            if (row == null)
            {
                continue;
            }

            row.Favorited = update.Favorited == true;
        }

        unlocks.Equipment = equipment.ToJson();
    }

    private sealed class EquipmentUpdate
    {
        public string? PrefabName { get; set; }
        public string? ModificationGuid { get; set; }
        public bool? Favorited { get; set; }
        public int SlotIndex { get; set; }
        public bool HasSlot { get; set; }
    }

    private static bool TryParse(JsonElement body, out List<EquipmentUpdate> entries)
    {
        entries = new List<EquipmentUpdate>();

        JsonElement array;
        if (body.ValueKind == JsonValueKind.Array)
        {
            array = body;
        }
        else if (body.ValueKind == JsonValueKind.Object)
        {
            var found = false;
            array = default;
            foreach (var prop in body.EnumerateObject())
            {
                if (string.Equals(prop.Name, "equipmentSlots", StringComparison.OrdinalIgnoreCase)
                    && prop.Value.ValueKind == JsonValueKind.Array)
                {
                    array = prop.Value;
                    found = true;
                    break;
                }
            }
            if (!found) return false;
        }
        else
        {
            return false;
        }

        foreach (var item in array.EnumerateArray())
        {
            if (item.ValueKind != JsonValueKind.Object) continue;

            var entry = new EquipmentUpdate();
            foreach (var prop in item.EnumerateObject())
            {
                if (string.Equals(prop.Name, "slotIndex", StringComparison.OrdinalIgnoreCase)
                    || string.Equals(prop.Name, "slot", StringComparison.OrdinalIgnoreCase)
                    || string.Equals(prop.Name, "index", StringComparison.OrdinalIgnoreCase))
                {
                    if (prop.Value.ValueKind == JsonValueKind.Number) entry.SlotIndex = prop.Value.GetInt32();
                    entry.HasSlot = true;
                }
                else if (string.Equals(prop.Name, "favorited", StringComparison.OrdinalIgnoreCase)
                    || string.Equals(prop.Name, "favourite", StringComparison.OrdinalIgnoreCase))
                {
                    if (prop.Value.ValueKind == JsonValueKind.True) entry.Favorited = true;
                    else if (prop.Value.ValueKind == JsonValueKind.False) entry.Favorited = false;
                }
                else if (string.Equals(prop.Name, "modificationGuid", StringComparison.OrdinalIgnoreCase)
                    || string.Equals(prop.Name, "equipmentModificationGuid", StringComparison.OrdinalIgnoreCase))
                {
                    if (prop.Value.ValueKind == JsonValueKind.String) entry.ModificationGuid = prop.Value.GetString();
                }
                else if (string.Equals(prop.Name, "prefabName", StringComparison.OrdinalIgnoreCase)
                    || string.Equals(prop.Name, "equipmentPrefabName", StringComparison.OrdinalIgnoreCase)
                    || string.Equals(prop.Name, "equipment", StringComparison.OrdinalIgnoreCase))
                {
                    if (prop.Value.ValueKind == JsonValueKind.String) entry.PrefabName = prop.Value.GetString();
                }
            }

            entries.Add(entry);
        }

        return true;
    }
}