using Microsoft.EntityFrameworkCore;
using PowderCoating.Core.Entities;
using PowderCoating.Core.Interfaces.Repositories;
using PowderCoating.Infrastructure.Data;

namespace PowderCoating.Infrastructure.Repositories;

/// <summary>
/// Typed repository for <see cref="Quote"/> that provides domain-specific queries previously
/// scattered as inline EF expressions across <c>QuotesController</c> and
/// <c>QuoteApprovalController</c>.
/// </summary>
public class QuoteRepository : Repository<Quote>, IQuoteRepository
{
    public QuoteRepository(ApplicationDbContext context) : base(context) { }

    /// <inheritdoc/>
    public async Task<Quote?> LoadForDetailsAsync(int id)
    {
        var quote = await _context.Quotes
            .Where(q => q.Id == id && !q.IsDeleted)
            .Include(q => q.Customer)
            .Include(q => q.PreparedBy)
            .Include(q => q.QuoteStatus)
            .Include(q => q.OvenCost)
            .Include(q => q.QuotePrepServices.Where(qps => !qps.IsDeleted))
                .ThenInclude(qps => qps.PrepService)
            .FirstOrDefaultAsync();

        if (quote == null) return null;

        // QuoteItems with nested coats and prep services loaded separately to avoid
        // cartesian explosion from multiple collection includes in a single query.
        quote.QuoteItems = await _context.QuoteItems
            .Where(qi => qi.QuoteId == id && !qi.IsDeleted)
            .Include(qi => qi.Coats)
                .ThenInclude(c => c.InventoryItem)
            .Include(qi => qi.Coats)
                .ThenInclude(c => c.Vendor)
            .Include(qi => qi.CatalogItem)
            .Include(qi => qi.PrepServices)
                .ThenInclude(ps => ps.PrepService)
            .ToListAsync();

        return quote;
    }

    /// <inheritdoc/>
    public async Task<Quote?> GetByApprovalTokenAsync(string token)
    {
        // IgnoreQueryFilters: approval portal is unauthenticated — no tenant context on the request.
        return await _context.Quotes
            .IgnoreQueryFilters()
            .Include(q => q.Customer)
            .Include(q => q.QuoteStatus)
            .Include(q => q.QuoteItems.Where(qi => !qi.IsDeleted))
            .FirstOrDefaultAsync(q => q.ApprovalToken == token && !q.IsDeleted);
    }

    /// <inheritdoc/>
    public async Task<List<QuoteChangeHistory>> GetChangeHistoryAsync(int quoteId)
    {
        return await _context.QuoteChangeHistories
            .Where(h => h.QuoteId == quoteId && !h.IsDeleted)
            .Include(h => h.ChangedBy)
            .OrderByDescending(h => h.ChangedAt)
            .AsNoTracking()
            .ToListAsync();
    }

    /// <inheritdoc/>
    public async Task<QuoteIndexStats> GetIndexStatsAsync(List<int> openStatusIds, List<int> approvedConvertedStatusIds)
    {
        var stats = await _context.Quotes
            .Where(q => !q.IsDeleted)
            .Select(q => new { q.QuoteStatusId, q.Total })
            .ToListAsync();

        return new QuoteIndexStats(
            OpenCount: stats.Count(q => openStatusIds.Contains(q.QuoteStatusId)),
            ApprovedConvertedCount: stats.Count(q => approvedConvertedStatusIds.Contains(q.QuoteStatusId)),
            TotalValue: stats.Sum(q => q.Total));
    }

    /// <inheritdoc/>
    public async Task<List<QuoteItem>> GetItemsWithCoatsAsync(int quoteId)
    {
        return await _context.QuoteItems
            .Where(qi => qi.QuoteId == quoteId && !qi.IsDeleted)
            .Include(qi => qi.Coats)
                .ThenInclude(c => c.InventoryItem)
            .Include(qi => qi.Coats)
                .ThenInclude(c => c.Vendor)
            .Include(qi => qi.CatalogItem)
            .Include(qi => qi.PrepServices)
                .ThenInclude(ps => ps.PrepService)
            .AsNoTracking()
            .ToListAsync();
    }

    /// <inheritdoc/>
    public async Task<string?> GetLastQuoteNumberByPrefixAsync(int companyId, string prefix)
    {
        return await _context.Quotes
            .IgnoreQueryFilters()
            .Where(q => q.CompanyId == companyId && q.QuoteNumber.StartsWith(prefix))
            .OrderByDescending(q => q.QuoteNumber)
            .Select(q => q.QuoteNumber)
            .FirstOrDefaultAsync();
    }
}