using System;
using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace Distribution.Migrations
{
    /// <inheritdoc />
    public partial class AddInvoiceVersionsAndLineEdits : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.AlterColumn<Guid>(
                name: "FK_ShopPOItemId",
                table: "InvoiceItems",
                type: "char(36)",
                nullable: true,
                collation: "ascii_general_ci",
                oldClrType: typeof(Guid),
                oldType: "char(36)")
                .OldAnnotation("Relational:Collation", "ascii_general_ci");

            migrationBuilder.AddColumn<bool>(
                name: "IsRemoved",
                table: "InvoiceItems",
                type: "tinyint(1)",
                nullable: false,
                defaultValue: false);

            migrationBuilder.CreateTable(
                name: "InvoiceVersions",
                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"),
                    VersionNumber = table.Column<int>(type: "int", nullable: false),
                    Stage = table.Column<int>(type: "int", nullable: false),
                    TotalAmount = table.Column<decimal>(type: "decimal(65,30)", nullable: false),
                    CreatedBy = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
                    IsActive = table.Column<bool>(type: "tinyint(1)", nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_InvoiceVersions", x => x.Id);
                    table.ForeignKey(
                        name: "FK_InvoiceVersions_Invoices_FK_InvoiceId",
                        column: x => x.FK_InvoiceId,
                        principalTable: "Invoices",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Restrict);
                })
                .Annotation("MySql:CharSet", "utf8mb4");

            migrationBuilder.CreateTable(
                name: "InvoiceVersionItems",
                columns: table => new
                {
                    Id = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
                    FK_InvoiceVersionId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
                    FK_ShopPOItemId = table.Column<Guid>(type: "char(36)", nullable: true, 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),
                    IsRemoved = table.Column<bool>(type: "tinyint(1)", 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_InvoiceVersionItems", x => x.Id);
                    table.ForeignKey(
                        name: "FK_InvoiceVersionItems_InvoiceVersions_FK_InvoiceVersionId",
                        column: x => x.FK_InvoiceVersionId,
                        principalTable: "InvoiceVersions",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Restrict);
                    table.ForeignKey(
                        name: "FK_InvoiceVersionItems_Items_FK_ItemId",
                        column: x => x.FK_ItemId,
                        principalTable: "Items",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Restrict);
                    table.ForeignKey(
                        name: "FK_InvoiceVersionItems_ShopPOItems_FK_ShopPOItemId",
                        column: x => x.FK_ShopPOItemId,
                        principalTable: "ShopPOItems",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Restrict);
                })
                .Annotation("MySql:CharSet", "utf8mb4");

            migrationBuilder.CreateIndex(
                name: "IX_InvoiceVersionItems_FK_InvoiceVersionId",
                table: "InvoiceVersionItems",
                column: "FK_InvoiceVersionId");

            migrationBuilder.CreateIndex(
                name: "IX_InvoiceVersionItems_FK_ItemId",
                table: "InvoiceVersionItems",
                column: "FK_ItemId");

            migrationBuilder.CreateIndex(
                name: "IX_InvoiceVersionItems_FK_ShopPOItemId",
                table: "InvoiceVersionItems",
                column: "FK_ShopPOItemId");

            migrationBuilder.CreateIndex(
                name: "IX_InvoiceVersions_FK_InvoiceId_VersionNumber",
                table: "InvoiceVersions",
                columns: new[] { "FK_InvoiceId", "VersionNumber" },
                unique: true);

            // Backfill: one baseline version per existing invoice from its current lines.
            migrationBuilder.Sql(@"
                INSERT INTO InvoiceVersions (Id, FK_InvoiceId, VersionNumber, Stage, TotalAmount, CreatedBy, CreatedAt, IsActive)
                SELECT UUID(), inv.Id, 1,
                       CASE inv.Status WHEN 0 THEN 0 WHEN 1 THEN 2 ELSE 3 END,
                       inv.TotalAmount, inv.CreatedBy, NOW(6), 1
                FROM Invoices inv;");

            migrationBuilder.Sql(@"
                INSERT INTO InvoiceVersionItems (Id, FK_InvoiceVersionId, FK_ShopPOItemId, FK_ItemId, Quantity, UnitPrice, IsRemoved, CreatedAt, IsActive)
                SELECT UUID(), v.Id, ii.FK_ShopPOItemId, ii.FK_ItemId, ii.Quantity, ii.UnitPrice, ii.IsRemoved, NOW(6), 1
                FROM InvoiceVersions v
                JOIN InvoiceItems ii ON ii.FK_InvoiceId = v.FK_InvoiceId AND ii.IsActive = 1
                WHERE v.VersionNumber = 1;");
        }

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

            migrationBuilder.DropTable(
                name: "InvoiceVersions");

            migrationBuilder.DropColumn(
                name: "IsRemoved",
                table: "InvoiceItems");

            migrationBuilder.AlterColumn<Guid>(
                name: "FK_ShopPOItemId",
                table: "InvoiceItems",
                type: "char(36)",
                nullable: false,
                defaultValue: new Guid("00000000-0000-0000-0000-000000000000"),
                collation: "ascii_general_ci",
                oldClrType: typeof(Guid),
                oldType: "char(36)",
                oldNullable: true)
                .OldAnnotation("Relational:Collation", "ascii_general_ci");
        }
    }
}