using System;
using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace Distribution.Migrations
{
    /// <inheritdoc />
    public partial class AddInvoiceItems : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.CreateTable(
                name: "InvoiceItems",
                columns: table => new
                {
                    Id = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
                    FK_InvoiceId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
                    FK_ShopPOItemId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
                    FK_ItemId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
                    Quantity = table.Column<int>(type: "int", nullable: false),
                    UnitPrice = table.Column<decimal>(type: "decimal(65,30)", nullable: false),
                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
                    IsActive = table.Column<bool>(type: "tinyint(1)", nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_InvoiceItems", x => x.Id);
                    table.ForeignKey(
                        name: "FK_InvoiceItems_Invoices_FK_InvoiceId",
                        column: x => x.FK_InvoiceId,
                        principalTable: "Invoices",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Restrict);
                    table.ForeignKey(
                        name: "FK_InvoiceItems_Items_FK_ItemId",
                        column: x => x.FK_ItemId,
                        principalTable: "Items",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Restrict);
                    table.ForeignKey(
                        name: "FK_InvoiceItems_ShopPOItems_FK_ShopPOItemId",
                        column: x => x.FK_ShopPOItemId,
                        principalTable: "ShopPOItems",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Restrict);
                })
                .Annotation("MySql:CharSet", "utf8mb4");

            migrationBuilder.CreateIndex(
                name: "IX_InvoiceItems_FK_InvoiceId",
                table: "InvoiceItems",
                column: "FK_InvoiceId");

            migrationBuilder.CreateIndex(
                name: "IX_InvoiceItems_FK_ItemId",
                table: "InvoiceItems",
                column: "FK_ItemId");

            migrationBuilder.CreateIndex(
                name: "IX_InvoiceItems_FK_ShopPOItemId",
                table: "InvoiceItems",
                column: "FK_ShopPOItemId");

            // Backfill: snapshot each existing invoice's PO lines so older invoices can be edited/finalized.
            migrationBuilder.Sql(@"
                INSERT INTO InvoiceItems (Id, FK_InvoiceId, FK_ShopPOItemId, FK_ItemId, Quantity, UnitPrice, CreatedAt, IsActive)
                SELECT UUID(), inv.Id, poi.Id, poi.FK_ItemId, poi.Quantity, poi.UnitPrice, NOW(6), 1
                FROM Invoices inv
                JOIN ShopPOItems poi ON poi.FK_ShopPOId = inv.FK_ShopPOId AND poi.IsActive = 1;");
        }

        /// <inheritdoc />
        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropTable(
                name: "InvoiceItems");
        }
    }
}