using Microsoft.AspNetCore.Mvc;
using SqlSugar;
using WIDESEA_Core;
using WIDESEA_Model.Models;

namespace WIDESEA_WMSServer.Controllers.Dashboard
{
    /// <summary>
    /// 仪表盘
    /// </summary>
    [Route("api/Dashboard")]
    [ApiController]
    public class DashboardController : ControllerBase
    {
        private readonly ISqlSugarClient _db;

        public DashboardController(ISqlSugarClient db)
        {
            _db = db;
        }

        /// <summary>
        /// 总览数据
        /// </summary>
        [HttpGet("Overview")]
        public async Task<WebResponseContent> Overview()
        {
            var today = DateTime.Today;
            var firstDayOfMonth = new DateTime(today.Year, today.Month, 1);

            // 今日入库数
            var todayInbound = await _db.Queryable<Dt_Task_Hty>()
                .Where(t => t.InsertTime >= today && t.TaskType >= 500 && t.TaskType < 600)
                .CountAsync();

            // 今日出库数
            var todayOutbound = await _db.Queryable<Dt_Task_Hty>()
                .Where(t => t.InsertTime >= today && t.TaskType >= 100 && t.TaskType < 200)
                .CountAsync();

            // 本月入库数
            var monthInbound = await _db.Queryable<Dt_Task_Hty>()
                .Where(t => t.InsertTime >= firstDayOfMonth && t.TaskType >= 500 && t.TaskType < 600)
                .CountAsync();

            // 本月出库数
            var monthOutbound = await _db.Queryable<Dt_Task_Hty>()
                .Where(t => t.InsertTime >= firstDayOfMonth && t.TaskType >= 100 && t.TaskType < 200)
                .CountAsync();

            // 当前总库存
            var totalStock = await _db.Queryable<Dt_StockInfo>().CountAsync();

            return WebResponseContent.Instance.OK(null, new
            {
                TodayInbound = todayInbound,
                TodayOutbound = todayOutbound,
                MonthInbound = monthInbound,
                MonthOutbound = monthOutbound,
                TotalStock = totalStock
            });
        }

        /// <summary>
        /// 每日统计
        /// </summary>
        [HttpGet("DailyStats")]
        public async Task<WebResponseContent> DailyStats([FromQuery] int days = 30)
        {
            if (days <= 0) days = 30;
            if (days > 365) days = 365;

            var startDate = DateTime.Today.AddDays(-days + 1);

            var query = await _db.Queryable<Dt_Task_Hty>()
                .Where(t => t.InsertTime >= startDate)
                .Select(t => new { t.InsertTime, t.TaskType })
                .ToListAsync();

            var result = query
                .GroupBy(t => t.InsertTime.Date)
                .Select(g => new
                {
                    Date = g.Key.ToString("yyyy-MM-dd"),
                    Inbound = g.Count(t => t.TaskType >= 500 && t.TaskType < 600),
                    Outbound = g.Count(t => t.TaskType >= 100 && t.TaskType < 200)
                })
                .OrderBy(x => x.Date)
                .ToList();

            return WebResponseContent.Instance.OK(null, result);
        }

        /// <summary>
        /// 每周统计
        /// </summary>
        [HttpGet("WeeklyStats")]
        public async Task<WebResponseContent> WeeklyStats([FromQuery] int weeks = 12)
        {
            if (weeks <= 0) weeks = 12;

            var startDate = DateTime.Today.AddDays(-weeks * 7);

            var query = await _db.Queryable<Dt_Task_Hty>()
                .Where(t => t.InsertTime >= startDate)
                .Select(t => new { t.InsertTime, t.TaskType })
                .ToListAsync();

            var result = query
                .GroupBy(t => GetWeekKey(t.InsertTime))
                .Select(g => new
                {
                    Week = g.Key,
                    Inbound = g.Count(t => t.TaskType >= 500 && t.TaskType < 600),
                    Outbound = g.Count(t => t.TaskType >= 100 && t.TaskType < 200)
                })
                .OrderBy(x => x.Week)
                .ToList();

            return WebResponseContent.Instance.OK(null, result);
        }

        private string GetWeekKey(DateTime date)
        {
            // 获取周一开始的周 (ISO 8601)
            var diff = (7 + (date.DayOfWeek - DayOfWeek.Monday)) % 7;
            var monday = date.AddDays(-diff);
            var weekNum = System.Globalization.CultureInfo.InvariantCulture
                .Calendar.GetWeekOfYear(monday, System.Globalization.CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
            return $"{monday.Year}-W{weekNum:D2}";
        }

        /// <summary>
        /// 每月统计
        /// </summary>
        [HttpGet("MonthlyStats")]
        public async Task<WebResponseContent> MonthlyStats([FromQuery] int months = 12)
        {
            if (months <= 0) months = 12;

            var startDate = DateTime.Today.AddMonths(-months + 1);
            startDate = new DateTime(startDate.Year, startDate.Month, 1);

            var query = await _db.Queryable<Dt_Task_Hty>()
                .Where(t => t.InsertTime >= startDate)
                .Select(t => new { t.InsertTime, t.TaskType })
                .ToListAsync();

            var result = query
                .GroupBy(t => new { t.InsertTime.Year, t.InsertTime.Month })
                .Select(g => new
                {
                    Month = $"{g.Key.Year}-{g.Key.Month:D2}",
                    Inbound = g.Count(t => t.TaskType >= 500 && t.TaskType < 600),
                    Outbound = g.Count(t => t.TaskType >= 100 && t.TaskType < 200)
                })
                .OrderBy(x => x.Month)
                .ToList();

            return WebResponseContent.Instance.OK(null, result);
        }

        /// <summary>
        /// 库存库龄分布
        /// </summary>
        [HttpGet("StockAgeDistribution")]
        public async Task<WebResponseContent> StockAgeDistribution()
        {
            var now = DateTime.Now;

            // 使用 SQL 直接分组统计，避免加载所有数据到内存
            var result = new[]
            {
                new { Range = "7天内", Count = await _db.Queryable<Dt_StockInfo>().Where(s => SqlFunc.DateDiff(DateType.Day, s.CreateDate, now) <= 7).CountAsync() },
                new { Range = "7-30天", Count = await _db.Queryable<Dt_StockInfo>().Where(s => SqlFunc.DateDiff(DateType.Day, s.CreateDate, now) > 7 && SqlFunc.DateDiff(DateType.Day, s.CreateDate, now) <= 30).CountAsync() },
                new { Range = "30-90天", Count = await _db.Queryable<Dt_StockInfo>().Where(s => SqlFunc.DateDiff(DateType.Day, s.CreateDate, now) > 30 && SqlFunc.DateDiff(DateType.Day, s.CreateDate, now) <= 90).CountAsync() },
                new { Range = "90天以上", Count = await _db.Queryable<Dt_StockInfo>().Where(s => SqlFunc.DateDiff(DateType.Day, s.CreateDate, now) > 90).CountAsync() }
            };

            return WebResponseContent.Instance.OK(null, result);
        }

        /// <summary>
        /// 各仓库库存分布
        /// </summary>
        [HttpGet("StockByWarehouse")]
        public async Task<WebResponseContent> StockByWarehouse()
        {
            // 先查询仓库名称
            var warehouses = await _db.Queryable<Dt_Warehouse>()
                .Select(w => new { w.WarehouseId, w.WarehouseName })
                .ToListAsync();
            var warehouseDict = warehouses.ToDictionary(w => w.WarehouseId, w => w.WarehouseName);

            // 查询库存数据并在内存中分组
            var stocks = await _db.Queryable<Dt_StockInfo>()
                .Select(s => new { s.WarehouseId })
                .ToListAsync();

            var result = stocks
                .GroupBy(s => s.WarehouseId)
                .Select(g => new
                {
                    Warehouse = warehouseDict.TryGetValue(g.Key, out var name) ? name : $"仓库{g.Key}",
                    Count = g.Count()
                })
                .ToList();

            return WebResponseContent.Instance.OK(null, result);
        }
    }
}