using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using SVSim.Database;
using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Gift;
using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Gift;

namespace SVSim.EmulatedEntrypoint.Controllers;

/// <summary>
/// Tutorial-scoped gift endpoints. We do NOT implement a generic gift system here —
/// only the /tutorial/gift_top and /tutorial/gift_receive aliases needed for the
/// step 31 → 41 reward flow. A full gift inbox is future work; if/when needed,
/// add /gift/top and /gift/receive_gift aliases to this controller.
/// </summary>
public class GiftController : SVSimController
{
    /// <summary>The hardcoded tutorial gift bundle every fresh viewer sees at step 31.</summary>
    public static readonly IReadOnlyList<PresentDto> TutorialGifts = new[]
    {
        new PresentDto { PresentId = "71478626", RewardType = "1", RewardDetailId = "0",     RewardCount = "400", Message = "For completing the tutorial" },
        new PresentDto { PresentId = "71478627", RewardType = "9", RewardDetailId = "0",     RewardCount = "100", Message = "For completing the tutorial" },
        new PresentDto { PresentId = "71478628", RewardType = "4", RewardDetailId = "1",     RewardCount = "3",   Message = "For completing the tutorial", ItemType = 1 },
        new PresentDto { PresentId = "71478629", RewardType = "4", RewardDetailId = "80001", RewardCount = "40",  Message = "For completing the tutorial", ItemType = 2 },
        new PresentDto { PresentId = "71478630", RewardType = "4", RewardDetailId = "90001", RewardCount = "1",   Message = "For completing the tutorial", ItemType = 2 },
    };

    private readonly SVSimDbContext _db;

    public GiftController(SVSimDbContext db)
    {
        _db = db;
    }

    [HttpPost("/tutorial/gift_top")]
    public async Task<ActionResult<GiftTopResponse>> TutorialGiftTop([FromBody] GiftTopRequest request)
    {
        if (!TryGetViewerId(out long viewerId)) return Unauthorized();

        var claimedList = await _db.ViewerClaimedTutorialGifts
            .Where(g => g.ViewerId == viewerId)
            .Select(g => g.PresentId)
            .ToListAsync();
        var claimed = new HashSet<string>(claimedList);

        var nowString = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss");
        var presents = TutorialGifts
            .Where(p => !claimed.Contains(p.PresentId))
            .Select(p => Clone(p, nowString))
            .ToList();
        var history = TutorialGifts
            .Where(p => claimed.Contains(p.PresentId))
            .Select(p => Clone(p, nowString))
            .ToList();

        return new GiftTopResponse
        {
            PresentList = presents,
            PresentHistoryList = history,
            LimitOverPresentList = new(),
        };
    }

    private static PresentDto Clone(PresentDto p, string createTime) => new()
    {
        PresentId = p.PresentId,
        RewardType = p.RewardType,
        RewardDetailId = p.RewardDetailId,
        RewardCount = p.RewardCount,
        ConditionNumber = p.ConditionNumber,
        PresentLimitType = p.PresentLimitType,
        RewardLimitTime = p.RewardLimitTime,
        CreateTime = createTime,
        ItemType = p.ItemType,
        Message = p.Message,
    };
}