-- Add invoice line items, payments, and billed time-entry tracking.

ALTER TABLE "timesheets"
ADD COLUMN "invoiceLineItemId" TEXT,
ADD COLUMN "billedAt" TIMESTAMP(3);

CREATE TABLE "invoice_line_items" (
    "id" TEXT NOT NULL,
    "invoiceId" TEXT NOT NULL,
    "description" TEXT NOT NULL,
    "quantity" DECIMAL(8,2) NOT NULL,
    "unitRate" DECIMAL(12,2) NOT NULL,
    "amount" DECIMAL(12,2) NOT NULL,
    "sourceType" TEXT,
    "sourceId" TEXT,
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

    CONSTRAINT "invoice_line_items_pkey" PRIMARY KEY ("id")
);

CREATE TABLE "payments" (
    "id" TEXT NOT NULL,
    "invoiceId" TEXT NOT NULL,
    "amount" DECIMAL(12,2) NOT NULL,
    "paymentMethod" "PaymentMethod" NOT NULL,
    "reference" TEXT,
    "receivedAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

    CONSTRAINT "payments_pkey" PRIMARY KEY ("id")
);

CREATE UNIQUE INDEX "timesheets_invoiceLineItemId_key" ON "timesheets"("invoiceLineItemId");
CREATE INDEX "timesheets_invoiceLineItemId_idx" ON "timesheets"("invoiceLineItemId");
CREATE INDEX "invoice_line_items_invoiceId_idx" ON "invoice_line_items"("invoiceId");
CREATE INDEX "invoice_line_items_sourceType_sourceId_idx" ON "invoice_line_items"("sourceType", "sourceId");
CREATE INDEX "payments_invoiceId_idx" ON "payments"("invoiceId");

ALTER TABLE "invoice_line_items"
ADD CONSTRAINT "invoice_line_items_invoiceId_fkey"
FOREIGN KEY ("invoiceId") REFERENCES "invoices"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

ALTER TABLE "timesheets"
ADD CONSTRAINT "timesheets_invoiceLineItemId_fkey"
FOREIGN KEY ("invoiceLineItemId") REFERENCES "invoice_line_items"("id") ON DELETE SET NULL ON UPDATE CASCADE;

ALTER TABLE "payments"
ADD CONSTRAINT "payments_invoiceId_fkey"
FOREIGN KEY ("invoiceId") REFERENCES "invoices"("id") ON DELETE RESTRICT ON UPDATE CASCADE;