using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace NeshinaPolina07_11
{
    public partial class _2Menu : Form
    {

        private const string MODE_PRODUCTS = "PRODUCTS";
        private const string MODE_ORDERS = "ORDERS";
        private string currentMode = MODE_PRODUCTS;

        public _2Menu()
        {
            InitializeComponent();
            InitializeSortComboBox();
            LoadSuppliers();
            this.Text = "Менеджер";
        }

        private void InitializeSortComboBox()
        {
            cmbSort.Items.Clear();
            cmbSort.Items.Add("Без сортировки");
            cmbSort.Items.Add("По возрастанию (остаток)");
            cmbSort.Items.Add("По убыванию (остаток)");
            cmbSort.SelectedIndex = 0;
        }

        private void LoadSuppliers()
        {
            cmbSupplier.Items.Clear();
            cmbSupplier.Items.Add(new SupplierItem { Name = "Все поставщики", Id = -1 });
            try
            {
                var db = DB.GetInstance();
                var connection = db.GetConnection();
                string query = "SELECT supplier_id, supplier_name FROM suppliers ORDER BY supplier_name";
                using (MySqlCommand cmd = new MySqlCommand(query, connection))
                using (MySqlDataReader reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        int id = Convert.ToInt32(reader["supplier_id"]);
                        string name = reader["supplier_name"].ToString();
                        cmbSupplier.Items.Add(new SupplierItem { Id = id, Name = name });
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка загрузки поставщиков: " + ex.Message, "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            cmbSupplier.DisplayMember = "Name";
            cmbSupplier.ValueMember = "Id";
            cmbSupplier.SelectedIndex = 0;
        }

        private class SupplierItem
        {
            public int Id { get; set; }
            public string Name { get; set; }
            public override string ToString() => Name;
        }

        private void SwitchMode(string mode)
        {
            currentMode = mode;

            if (mode == MODE_PRODUCTS)
            {
                lblSort.Visible = true;
                cmbSort.Visible = true;
                lblSupplier.Visible = true;
                cmbSupplier.Visible = true;
                LoadProductsData(txtSearch.Text, cmbSort.SelectedItem?.ToString() ?? "Без сортировки", GetSelectedSupplierId());
            }
            else if (mode == MODE_ORDERS)
            {
                lblSort.Visible = false;
                cmbSort.Visible = false;
                lblSupplier.Visible = false;
                cmbSupplier.Visible = false;
                LoadOrdersData(txtSearch.Text);
            }
        }

        private void LoadProductsData(string searchQuery = "", string sortOption = "Без сортировки", int? supplierId = null)
        {
            try
            {
                var db = DB.GetInstance();
                var connection = db.GetConnection();

                string query = @"
            SELECT 
                p.product_id,
                p.product_article,
                p.product_name,
                p.unit,
                p.price,
                p.discount,
                p.quantity_in_stock,
                p.description,
                p.photo,
                c.category_name AS category,
                m.manufacturer_name AS manufacturer,
                s.supplier_name AS supplier
            FROM products p
            LEFT JOIN categories c ON p.category_id = c.category_id
            LEFT JOIN manufacturers m ON p.manufacturer_id = m.manufacturer_id
            LEFT JOIN suppliers s ON p.supplier_id = s.supplier_id";
                var conditions = new List<string>();
                var parameters = new List<MySqlParameter>();
                if (!string.IsNullOrWhiteSpace(searchQuery))
                {
                    string searchPattern = "%" + searchQuery.Trim().ToLower() + "%";
                    conditions.Add(@"
                LOWER(COALESCE(p.product_article, '')) LIKE @search OR
                LOWER(COALESCE(p.product_name, '')) LIKE @search OR
                LOWER(COALESCE(p.unit, '')) LIKE @search OR
                LOWER(COALESCE(CAST(p.price AS CHAR), '')) LIKE @search OR
                LOWER(COALESCE(CAST(p.discount AS CHAR), '')) LIKE @search OR
                LOWER(COALESCE(CAST(p.quantity_in_stock AS CHAR), '')) LIKE @search OR
                LOWER(COALESCE(p.description, '')) LIKE @search OR
                LOWER(COALESCE(p.photo, '')) LIKE @search OR
                LOWER(COALESCE(c.category_name, '')) LIKE @search OR
                LOWER(COALESCE(m.manufacturer_name, '')) LIKE @search OR
                LOWER(COALESCE(s.supplier_name, '')) LIKE @search
            ");
                    parameters.Add(new MySqlParameter("@search", searchPattern));
                }
                if (supplierId.HasValue && supplierId.Value != -1)
                {
                    conditions.Add("p.supplier_id = @supplierId");
                    parameters.Add(new MySqlParameter("@supplierId", supplierId.Value));
                }
                if (conditions.Count > 0)
                {
                    query += " WHERE " + string.Join(" AND ", conditions);
                }
                switch (sortOption)
                {
                    case "По возрастанию (остаток)":
                        query += " ORDER BY p.quantity_in_stock ASC";
                        break;
                    case "По убыванию (остаток)":
                        query += " ORDER BY p.quantity_in_stock DESC";
                        break;
                }

                using (MySqlCommand cmd = new MySqlCommand(query, connection))
                {
                    cmd.Parameters.AddRange(parameters.ToArray());
                    using (MySqlDataAdapter adapter = new MySqlDataAdapter(cmd))
                    {
                        DataTable dt = new DataTable();
                        adapter.Fill(dt);
                        dgvProducts.DataSource = dt;
                    }
                }

                dgvProducts.AutoResizeColumns();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка загрузки данных о товарах: " + ex.Message, "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void LoadOrdersData(string searchQuery = "")
        {
            try
            {
                var db = DB.GetInstance();
                var connection = db.GetConnection();

                string query = @"
            SELECT 
                o.order_id,
                o.order_date,
                o.delivery_date,
                pp.address AS pickup_point, -- Вместо pickup_point_id
                u.full_name AS user_name,           -- Вместо user_id
                o.receive_code,
                os.status_name AS status             -- Вместо status_id
            FROM orders o
            LEFT JOIN pickup_points pp ON o.pickup_point_id = pp.point_id
            LEFT JOIN users u ON o.user_id = u.user_id
            LEFT JOIN order_statuses os ON o.status_id = os.status_id";

                var conditions = new List<string>();
                var parameters = new List<MySqlParameter>();

                if (!string.IsNullOrWhiteSpace(searchQuery))
                {
                    string searchPattern = "%" + searchQuery.Trim().ToLower() + "%";
                    conditions.Add(@"
                LOWER(COALESCE(CAST(o.order_id AS CHAR), '')) LIKE @search OR
                LOWER(COALESCE(CAST(o.order_date AS CHAR), '')) LIKE @search OR
                LOWER(COALESCE(CAST(o.delivery_date AS CHAR), '')) LIKE @search OR
                LOWER(COALESCE(pp.address, '')) LIKE @search OR -- Поиск по названию пункта выдачи
                LOWER(COALESCE(u.full_name, '')) LIKE @search OR          -- Поиск по имени пользователя
                LOWER(COALESCE(o.receive_code, '')) LIKE @search OR
                LOWER(COALESCE(os.status_name, '')) LIKE @search          -- Поиск по названию статуса
            ");
                    parameters.Add(new MySqlParameter("@search", searchPattern));
                }

                if (conditions.Count > 0)
                {
                    query += " WHERE " + string.Join(" AND ", conditions);
                }

             

                using (MySqlCommand cmd = new MySqlCommand(query, connection))
                {
                    cmd.Parameters.AddRange(parameters.ToArray());
                    using (MySqlDataAdapter adapter = new MySqlDataAdapter(cmd))
                    {
                        DataTable dt = new DataTable();
                        adapter.Fill(dt);
                        dgvProducts.DataSource = dt;
                    }
                }

                dgvProducts.AutoResizeColumns();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка загрузки данных о заказах: " + ex.Message, "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void PerformSearch()
        {
            if (currentMode == MODE_PRODUCTS)
            {
                LoadProductsData(txtSearch.Text, cmbSort.SelectedItem?.ToString() ?? "Без сортировки", GetSelectedSupplierId());
            }
            else if (currentMode == MODE_ORDERS)
            {
                LoadOrdersData(txtSearch.Text);
            }
        }


        private void LoadData(string searchQuery = "", string sortOption = "Без сортировки", int? supplierId = null)
        {
            try
            {
                var db = DB.GetInstance();
                var connection = db.GetConnection();

                string query = @"
            SELECT 
                p.product_id,
                p.product_article,
                p.product_name,
                p.unit,
                p.price,
                p.discount,
                p.quantity_in_stock,
                p.description,
                p.photo,
                c.category_name AS category,
                m.manufacturer_name AS manufacturer,
                s.supplier_name AS supplier
            FROM products p
            LEFT JOIN categories c ON p.category_id = c.category_id
            LEFT JOIN manufacturers m ON p.manufacturer_id = m.manufacturer_id
            LEFT JOIN suppliers s ON p.supplier_id = s.supplier_id";
                var conditions = new List<string>();
                var parameters = new List<MySqlParameter>();
                if (!string.IsNullOrWhiteSpace(searchQuery))
                {
                    string searchPattern = "%" + searchQuery.Trim().ToLower() + "%";
                    conditions.Add(@"
                LOWER(COALESCE(p.product_article, '')) LIKE @search OR
                LOWER(COALESCE(p.product_name, '')) LIKE @search OR
                LOWER(COALESCE(p.unit, '')) LIKE @search OR
                LOWER(COALESCE(CAST(p.price AS CHAR), '')) LIKE @search OR
                LOWER(COALESCE(CAST(p.discount AS CHAR), '')) LIKE @search OR
                LOWER(COALESCE(CAST(p.quantity_in_stock AS CHAR), '')) LIKE @search OR
                LOWER(COALESCE(p.description, '')) LIKE @search OR
                LOWER(COALESCE(p.photo, '')) LIKE @search OR
                LOWER(COALESCE(c.category_name, '')) LIKE @search OR
                LOWER(COALESCE(m.manufacturer_name, '')) LIKE @search OR
                LOWER(COALESCE(s.supplier_name, '')) LIKE @search
            ");
                    parameters.Add(new MySqlParameter("@search", searchPattern));
                }
                if (supplierId.HasValue && supplierId.Value != -1)
                {
                    conditions.Add("p.supplier_id = @supplierId");
                    parameters.Add(new MySqlParameter("@supplierId", supplierId.Value));
                }
                if (conditions.Count > 0)
                {
                    query += " WHERE " + string.Join(" AND ", conditions);
                }
                switch (sortOption)
                {
                    case "По возрастанию (остаток)":
                        query += " ORDER BY p.quantity_in_stock ASC";
                        break;
                    case "По убыванию (остаток)":
                        query += " ORDER BY p.quantity_in_stock DESC";
                        break;
                }

                using (MySqlCommand cmd = new MySqlCommand(query, connection))
                {
                    cmd.Parameters.AddRange(parameters.ToArray());
                    using (MySqlDataAdapter adapter = new MySqlDataAdapter(cmd))
                    {
                        DataTable dt = new DataTable();
                        adapter.Fill(dt);
                        dgvProducts.DataSource = dt;
                    }
                }

                dgvProducts.AutoResizeColumns();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка загрузки данных: " + ex.Message, "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }


        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }

        private void _2Menu_Load(object sender, EventArgs e)
        {
           
        }

        private void button1_Click(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            MainForm form = new MainForm();
            form.Show();
            this.Hide();
        }

        private void button3_Click(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            PerformSearch();

        }

        private void cmbSort_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (currentMode == MODE_PRODUCTS) 
            {
                LoadProductsData(txtSearch.Text, cmbSort.SelectedItem?.ToString() ?? "Без сортировки", GetSelectedSupplierId());
            }
        }

        private void cmbSupplier_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (currentMode == MODE_PRODUCTS) 
            {
                int? supplierId = GetSelectedSupplierId();
                string sort = cmbSort.SelectedItem?.ToString() ?? "Без сортировки";
                LoadProductsData(txtSearch.Text, sort, supplierId);
            }
        }

        private int? GetSelectedSupplierId()
        {
            if (cmbSupplier.SelectedItem is SupplierItem item)
            {
                return item.Id == -1 ? (int?)null : item.Id;
            }
            return null;
        }

        private void _2Menu_FormClosing(object sender, FormClosingEventArgs e)
        {
            e.Cancel = true; 
            this.Hide();
            MainForm form1 = new MainForm();
            form1.Show();
        }

        private void товарыToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SwitchMode(MODE_ORDERS);

        }

        private void заказыToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SwitchMode(MODE_PRODUCTS);
        }
    }
}