using AgriculturalPlatform.Api.Data;
using AgriculturalPlatform.Api.Dtos;
using AgriculturalPlatform.Api.Models;
using AgriculturalPlatform.Api.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace AgriculturalPlatform.Api.Controllers;

[ApiController]
[Route("api/reports")]
[Authorize]
public class ReportsController(AppDbContext db, DataScopeService scope, CurrentUserService currentUser) : ControllerBase
{
    /// <summary>收购汇总报表（维度：day=按日 / month=按月 / product=按品种 / farmer=按农户 / org=按收购方）</summary>
    [HttpGet("purchase-summary")]
    public async Task<ActionResult<PurchaseSummaryResult>> PurchaseSummary(
        string dimension = "day", DateTime? from = null, DateTime? to = null)
    {
        var start = from ?? DateTime.Today.AddDays(-29);
        var end = (to ?? DateTime.Today).Date.AddDays(1);

        var visible = await scope.GetVisibleOrgIdsAsync(currentUser.Get());
        var query = db.PurchaseOrders
            .Where(p => p.Status == PurchaseStatus.Completed && p.CreatedAt >= start && p.CreatedAt < end)
            .AsQueryable();
        if (visible is not null)
            query = query.Where(p => visible.Contains(p.PurchaserOrgId));

        var rows = dimension switch
        {
            "month" => (await query
                .GroupBy(p => new { p.CreatedAt.Year, p.CreatedAt.Month })
                .Select(g => new
                {
                    Year = g.Key.Year,
                    Month = g.Key.Month,
                    Amount = g.Sum(p => p.Amount),
                    Weight = g.Sum(p => p.NetWeight),
                    Cnt = g.Count()
                })
                .OrderBy(g => g.Year).ThenBy(g => g.Month)
                .ToListAsync())
                .Select(g => new
                {
                    Key = $"{g.Year}-{g.Month:D2}",
                    g.Amount,
                    g.Weight,
                    g.Cnt
                })
                .ToList(),
            "product" => await query
                .GroupBy(p => p.Product!.Name)
                .Select(g => new { Key = g.Key, Amount = g.Sum(p => p.Amount), Weight = g.Sum(p => p.NetWeight), Cnt = g.Count() })
                .OrderByDescending(g => g.Amount).ToListAsync(),
            "farmer" => await query
                .GroupBy(p => p.Farmer!.Name)
                .Select(g => new { Key = g.Key, Amount = g.Sum(p => p.Amount), Weight = g.Sum(p => p.NetWeight), Cnt = g.Count() })
                .OrderByDescending(g => g.Amount).Take(20).ToListAsync(),
            "org" => await query
                .GroupBy(p => p.PurchaserOrg!.Name)
                .Select(g => new { Key = g.Key, Amount = g.Sum(p => p.Amount), Weight = g.Sum(p => p.NetWeight), Cnt = g.Count() })
                .OrderByDescending(g => g.Amount).ToListAsync(),
            _ => (await query
                .GroupBy(p => new { p.CreatedAt.Year, p.CreatedAt.Month, p.CreatedAt.Day })
                .Select(g => new
                {
                    Year = g.Key.Year,
                    Month = g.Key.Month,
                    Day = g.Key.Day,
                    Amount = g.Sum(p => p.Amount),
                    Weight = g.Sum(p => p.NetWeight),
                    Cnt = g.Count()
                })
                .OrderBy(g => g.Year).ThenBy(g => g.Month).ThenBy(g => g.Day)
                .ToListAsync())
                .Select(g => new
                {
                    Key = $"{g.Year}-{g.Month:D2}-{g.Day:D2}",
                    g.Amount,
                    g.Weight,
                    g.Cnt
                })
                .ToList()
        };

        return Ok(new PurchaseSummaryResult(
            dimension, start, end,
            rows.Sum(r => r.Amount), rows.Sum(r => r.Weight), rows.Sum(r => r.Cnt),
            rows.Select(r => new SummaryRow(r.Key, r.Key, r.Amount, r.Cnt)).ToArray()));
    }

    /// <summary>付款统计报表</summary>
    [HttpGet("payment-summary")]
    public async Task<ActionResult<PaymentSummaryResult>> PaymentSummary(DateTime? from = null, DateTime? to = null)
    {
        var start = from ?? DateTime.Today.AddDays(-29);
        var end = (to ?? DateTime.Today).Date.AddDays(1);

        var visible = await scope.GetVisibleOrgIdsAsync(currentUser.Get());
        var query = db.PaymentRecords.AsQueryable();
        if (visible is not null)
            query = query.Where(p => p.PurchaserOrgId != null && visible.Contains(p.PurchaserOrgId.Value));

        var inRange = query.Where(p => p.CreatedAt >= start && p.CreatedAt < end);
        var totalPaid = await inRange.Where(p => p.Status == PayStatus.Success).SumAsync(p => (decimal?)p.Amount) ?? 0;
        var totalPending = await inRange.Where(p => p.Status == PayStatus.Pending).SumAsync(p => (decimal?)p.Amount) ?? 0;
        var payCount = await inRange.Where(p => p.Status == PayStatus.Success).CountAsync();

        var byMethod = await inRange.GroupBy(p => p.Method.ToString())
            .Select(g => new { Key = g.Key, Value = g.Sum(p => p.Amount), Cnt = g.Count() })
            .ToListAsync();
        var byStatus = await inRange.GroupBy(p => p.Status.ToString())
            .Select(g => new { Key = g.Key, Value = g.Sum(p => p.Amount), Cnt = g.Count() })
            .ToListAsync();

        return Ok(new PaymentSummaryResult(start, end, totalPaid, totalPending, payCount,
            byMethod.Select(g => new SummaryRow(g.Key, g.Key, g.Value, g.Cnt)).ToArray(),
            byStatus.Select(g => new SummaryRow(g.Key, g.Key, g.Value, g.Cnt)).ToArray()));
    }

    /// <summary>开票统计报表</summary>
    [HttpGet("invoice-summary")]
    public async Task<ActionResult<InvoiceSummaryResult>> InvoiceSummary(DateTime? from = null, DateTime? to = null)
    {
        var start = from ?? DateTime.Today.AddDays(-29);
        var end = (to ?? DateTime.Today).Date.AddDays(1);

        var visible = await scope.GetVisibleOrgIdsAsync(currentUser.Get());
        var query = db.Invoices.Where(i => i.IssueDate >= start && i.IssueDate < end).AsQueryable();
        if (visible is not null)
            query = query.Where(i => visible.Contains(i.PurchaserOrgId));

        var issued = query.Where(i => i.Status == InvoiceStatus.Issued);
        var totalAmount = await issued.SumAsync(i => (decimal?)i.Amount) ?? 0;
        var totalTax = await issued.SumAsync(i => (decimal?)i.TaxAmount) ?? 0;
        var issueCount = await issued.CountAsync();

        var byProduct = await issued.GroupBy(i => i.Product!.Name)
            .Select(g => new { Key = g.Key, Value = g.Sum(i => i.Amount), Cnt = g.Count() })
            .OrderByDescending(g => g.Value).ToListAsync();
        var byStatus = await query.GroupBy(i => i.Status.ToString())
            .Select(g => new { Key = g.Key, Value = g.Sum(i => i.Amount), Cnt = g.Count() })
            .ToListAsync();

        return Ok(new InvoiceSummaryResult(start, end, totalAmount, totalTax, issueCount,
            byProduct.Select(g => new SummaryRow(g.Key, g.Key, g.Value, g.Cnt)).ToArray(),
            byStatus.Select(g => new SummaryRow(g.Key, g.Key, g.Value, g.Cnt)).ToArray()));
    }
}