since3-portal/modules/shared/queries/invoices.ts

import "server-only"
import { createClient } from "@/lib/supabase/server"
import type { InvoiceListItem, InvoicePdfData, ProductTemplate } from "@/modules/shared/schemas/invoice"

export async function getInvoices(clientId: string): Promise<InvoiceListItem[]> {
    const supabase = await createClient()
    // Versandinfo direkt aus invoices: die View expandiert i.* nur zum Anlegezeitpunkt und kennt die Spalten nicht.
    const [{ data, error }, { data: mailRows, error: mailError }] = await Promise.all([
        supabase
            .from("invoices_overview")
            .select("id, invoice_number, status, display_status, gross_total, due_date, invoice_date")
            .eq("client_id", clientId)
            .order("invoice_date", { ascending: false })
            .order("invoice_number", { ascending: false }),
        supabase.from("invoices").select("id, email_sent_at, email_sent_to").eq("client_id", clientId),
    ])

    if (error || mailError) throw new Error("Rechnungen konnten nicht geladen werden.")

    const mailInfo = new Map(mailRows.map((row) => [row.id, row]))

    return data.map((row) => ({
        id: row.id,
        invoiceNumber: row.invoice_number,
        status: row.status,
        displayStatus: row.display_status,
        grossTotal: Number(row.gross_total),
        dueDate: row.due_date,
        invoiceDate: row.invoice_date,
        emailSentAt: mailInfo.get(row.id)?.email_sent_at ?? null,
        emailSentTo: mailInfo.get(row.id)?.email_sent_to ?? null,
    }))
}

export async function getProductTemplates(): Promise<ProductTemplate[]> {
    const supabase = await createClient()
    const { data, error } = await supabase
        .from("product_templates")
        .select("id, name, description, unit_price, tax_rate")
        .eq("is_active", true)
        .order("name")

    if (error) throw new Error("Produktvorlagen konnten nicht geladen werden.")

    return data.map((row) => ({
        id: row.id,
        name: row.name,
        description: row.description,
        unitPrice: Number(row.unit_price),
        taxRate: Number(row.tax_rate),
    }))
}

export async function peekNextInvoiceNumber(): Promise<string | null> {
    const supabase = await createClient()
    const { data, error } = await supabase.rpc("peek_next_invoice_number")
    if (error || typeof data !== "string") return null
    return data
}

export async function getInvoicesForPdf(invoiceIds: string[]): Promise<InvoicePdfData[]> {
    const supabase = await createClient()
    const { data, error } = await supabase
        .from("invoices")
        .select(`
            invoice_number, invoice_date, due_date, company_name,
            billing_street, billing_postal_code, billing_city, billing_country,
            invoice_items ( position, description, quantity, unit_price, tax_rate )
        `)
        .in("id", invoiceIds)
        .order("invoice_number")

    if (error) throw new Error("Rechnungen konnten nicht geladen werden.")

    return data.map((row) => ({
        invoiceNumber: row.invoice_number,
        invoiceDate: row.invoice_date,
        dueDate: row.due_date,
        companyName: row.company_name,
        billingStreet: row.billing_street,
        billingPostalCode: row.billing_postal_code,
        billingCity: row.billing_city,
        billingCountry: row.billing_country,
        items: [...row.invoice_items]
            .sort((a, b) => a.position - b.position)
            .map((item) => ({
                description: item.description,
                quantity: Number(item.quantity),
                unitPrice: Number(item.unit_price),
                taxRate: Number(item.tax_rate),
            })),
    }))
}