// Mapping zwischen Postgres-Rows und dem Frontend-`data`-Shape.
//
// Konventionen:
// - DB ist snake_case, Frontend camelCase. Übersetzung explizit pro Entity.
// - Postgres `numeric` kommt als String via JSON-API zurück → `num()` wandelt.
// - JSONB-Spalten (settings.formats, settings.ui, settings.page_margins,
//   protocols.participants, projects.positions, …) werden direkt in das
//   Frontend-Objekt gespreaded.
// - Zirkuläre / verschachtelte Sub-Entities (invoice.reminders, project.linkedQuotes,
//   delivery_note.items) bekommen eine Liste der Parent-IDs übergeben und
//   filtern selbst zur richtigen Zeile.

const num = (v) => v == null ? null : Number(v);

// Reverse-Mapping: Settings flach → JSONB-Sub-Objekte zerlegen.
// Diese Felder gehören in settings.formats:
const FORMAT_KEYS = ["projectNumberFormat", "invoiceNumberFormat", "protokollNumberFormat", "pdfNameFormat"];
// in settings.page_margins:
const PAGE_MARGIN_KEYS = ["pageMarginTop", "pageMarginBottom", "pageMarginLeft", "pageMarginRight"];
// in settings.ui:
const UI_KEYS = ["autoPrint", "logoSize", "qrNewPage", "expenseCategories", "internalExpenseCategories"];

function pickKeys(obj, keys) {
  const out = {};
  for (const k of keys) if (obj[k] !== undefined) out[k] = obj[k];
  return out;
}

export const fromDB = {
  studio: (r) => ({ id: r.id, name: r.name, slug: r.slug }),

  // Settings sind eine 1:1-Tabelle + studio_roles als Sub-Liste.
  // JSONB-Felder werden flach in `settings` gespreaded, damit das Frontend
  // weiter mit `settings.projectNumberFormat`, `settings.pageMarginTop` etc.
  // arbeiten kann.
  studioSettings: (row, roles = []) => ({
    setupCompleted: row.setup_completed,
    name: row.name,
    address: row.address,
    street: row.street, zip: row.zip, city: row.city, country: row.country,
    email: row.email, phone: row.phone,
    iban: row.iban, ibanType: row.iban_type,
    mwst: row.mwst_nr, mwstRate: num(row.mwst_rate),
    defaultHourlyRate: num(row.default_hourly_rate),
    defaultWochenstunden: num(row.default_wochenstunden),
    defaultFerienWochen: num(row.default_ferien_wochen),
    closedMonths: row.closed_months || [],
    blockMaiTag: row.block_mai_tag,
    protokollTypeAbbreviations: row.protokoll_type_abbr || {},
    logoUrl: row.logo_url,  // Pfad in Supabase Storage (statt Base64)
    ...(row.formats || {}),       // projectNumberFormat, invoiceNumberFormat, protokollNumberFormat, pdfNameFormat
    ...(row.page_margins || {}),  // pageMarginTop/Bottom/Left/Right
    ...(row.ui || {}),            // autoPrint, logoSize, qrNewPage, expenseCategories, internalExpenseCategories
    roles: roles.map(fromDB.studioRole),
  }),

  studioRole: (r) => ({ id: r.id, label: r.label, rate: num(r.rate) }),

  person: (r) => ({
    id: r.id,
    isShared: r.studio_id === null,  // global = studio_id NULL + Sichtbarkeit via person_studio_links
    name: r.name,
    type: r.person_type,
    isAuftraggeber: r.is_auftraggeber,
    isPartner: r.is_partner,
    street: r.street, zip: r.zip, city: r.city, country: r.country,
    email: r.email, phone: r.phone, website: r.website,
    note: r.note,
    contacts: r.contacts || [],
    honorarOffers: r.honorar_offers || [],
  }),

  project: (r, allQuoteLinks = []) => ({
    id: r.id,
    number: r.number,
    name: r.name,
    clientId: r.client_id,
    category: r.category,
    billingType: r.billing_type,
    hourlyRate: num(r.hourly_rate),
    budget: num(r.budget),
    budgetHours: num(r.budget_hours),
    status: r.status,
    description: r.description,
    startDate: r.start_date,
    enabledPhases: r.enabled_phases || [],
    positions: r.positions || [],
    customPhases: r.custom_phases || [],
    projectContacts: r.project_contacts || [],
    internalMembers: r.internal_members || [],
    linkedQuotes: allQuoteLinks
      .filter(l => l.project_id === r.id)
      .map(l => ({ quoteId: l.quote_id, role: l.role })),
  }),

  quote: (r) => ({
    id: r.id,
    number: r.number,
    clientId: r.client_id,
    projectId: r.project_id,
    projectName: r.project_name,
    date: r.date,
    validUntil: r.valid_until,
    mode: r.mode,
    mwst: r.mwst,
    notes: r.notes,
    status: r.status,
    sia: r.sia_config,
    manualPhases: r.manual_phases,
    freeItems: r.free_items,
    quoteRoles: r.quote_roles,
  }),

  invoice: (r, allReminders = []) => ({
    id: r.id,
    number: r.number,
    clientId: r.client_id,
    contactId: r.contact_id,
    projectId: r.project_id,
    quoteId: r.quote_id,
    date: r.date,
    dueDate: r.due_date,
    sentDate: r.sent_date,
    paidDate: r.paid_date,
    items: r.items || [],
    mwst: r.mwst,
    mwstRate: num(r.mwst_rate),
    notes: r.notes,
    status: r.status,
    invoiceKind: r.invoice_kind,
    discountType: r.discount_type,
    discountValue: num(r.discount_value),
    discountLabel: r.discount_label,
    entrySelections: r.entry_selections || {},
    qrReference: r.qr_reference,
    reminders: allReminders
      .filter(rem => rem.invoice_id === r.id)
      .sort((a, b) => (a.nr || 0) - (b.nr || 0))
      .map(rem => ({
        nr: rem.nr,
        date: rem.date,
        sentDate: rem.sent_date,
        daysPast: rem.days_past,
        note: rem.note,
      })),
  }),

  expense: (r) => ({
    id: r.id,
    employeeId: r.employee_id,
    projectId: r.project_id,
    date: r.date,
    category: r.category,
    description: r.description,
    amount: num(r.amount),
    mwstRate: num(r.mwst_rate),
    inclMwst: r.incl_mwst,
    status: r.status,
    receiptUrl: r.receipt_url,
    receiptName: r.receipt_name,
    lohnEntryId: r.lohn_entry_id,
  }),

  internalExpense: (r) => ({
    id: r.id,
    date: r.date,
    category: r.category,
    description: r.description,
    amount: num(r.amount),
    mwstRate: num(r.mwst_rate),
    inclMwst: r.incl_mwst,
    recurring: r.recurring,
    recurringInterval: r.recurring_interval,
    receiptUrl: r.receipt_url,
  }),

  timeEntry: (r) => ({
    id: r.id,
    employeeId: r.employee_id,
    projectId: r.project_id,
    phaseId: r.phase_id,
    positionId: r.position_id,
    date: r.date,
    minutes: r.minutes,
    startTime: r.start_time,
    endTime: r.end_time,
    description: r.description,
    createdAt: r.created_at,
  }),

  employee: (r) => ({
    id: r.id,
    name: r.name,
    personalNr: r.personal_nr,
    pensum: r.pensum,
    wochenstunden: num(r.wochenstunden),
    ferienWochen: num(r.ferien_wochen),
    pkAGSatz: num(r.pk_ag_satz),
    ferienUebertragVorjahr: r.ferien_uebertrag_vorjahr || {},
    _appUserId: r.app_user_id,
    active: r.active,
  }),

  absence: (r) => ({
    id: r.id,
    employeeId: r.employee_id,
    type: r.type_id,
    date: r.date,
    dateFrom: r.date_from,
    dateTo: r.date_to,
    startTime: r.start_time,
    endTime: r.end_time,
    hours: r.hours,
    minutes: r.minutes,
    note: r.note,
    status: r.status,
    createdAt: r.created_at,
  }),

  vacationEntry: (r) => ({
    id: r.id,
    employeeId: r.employee_id,
    dateFrom: r.date_from,
    dateTo: r.date_to,
    note: r.note,
    status: r.status,
    originalData: r.original_data,
    createdAt: r.created_at,
  }),

  payrollEntry: (r) => ({
    id: r.id,
    employeeId: r.employee_id,
    year: r.year,
    month: r.month,
    brutto: num(r.brutto),
    ahv: num(r.ahv), alv: num(r.alv), bvg: num(r.bvg),
    nbu: num(r.nbu), ktg: num(r.ktg),
    quellensteuer: num(r.quellensteuer),
    spesen: num(r.spesen),
    bonus: num(r.bonus),
    netto: num(r.netto),
    status: r.status,
    paidAt: r.paid_at,
  }),

  overtimeClosing: (r) => ({
    id: r.id,
    employeeId: r.employee_id,
    date: r.date,
    saldoHours: num(r.saldo_hours),
  }),

  holiday: (r) => ({
    date: r.date,
    label: r.label,
    halfDay: r.half_day,
  }),

  absenceType: (r) => ({ id: r.id, label: r.label, color: r.color }),

  letterTemplate: (r) => ({ id: r.id, name: r.name, body: r.body }),

  appRole: (r) => ({
    id: r.id,
    name: r.name,
    permissions: r.permissions,
    dashboardTemplateId: r.dashboard_template_id,
  }),

  dashboardTemplate: (r) => ({
    id: r.id,
    name: r.name,
    isPublic: r.is_public,
    layout: r.layout,
  }),

  protocol: (r) => ({
    id: r.id,
    number: r.number,
    type: r.type,
    location: r.location,
    projectId: r.project_id,
    projectManual: r.project_manual,
    participants: r.participants || [],
    traktanden: r.traktanden || [],
    nextDate: r.next_date,
    verteiler: r.verteiler,
    createdAt: r.created_at,
  }),

  deliveryNote: (r, allItems = []) => ({
    id: r.id,
    number: r.number,
    date: r.date,
    clientId: r.client_id,
    projectId: r.project_id,
    notes: r.notes,
    items: allItems
      .filter(it => it.delivery_note_id === r.id)
      .sort((a, b) => (a.sort || 0) - (b.sort || 0))
      .map(it => ({
        id: it.id,
        desc: it.description,
        qty: num(it.qty),
        unit: it.unit,
        note: it.note,
      })),
  }),

  blogPost: (r) => ({
    id: r.id,
    authorId: r.author_id,
    category: r.category,
    title: r.title,
    body: r.body,
    pinned: r.pinned,
    createdAt: r.created_at,
  }),
};

// ───────────────────────────────────────────────────────────────────────────
// Frontend → DB Mapping (für save())
// ───────────────────────────────────────────────────────────────────────────

export const toDB = {
  studioSettings: (settings, studioId) => ({
    studio_id: studioId,
    setup_completed: settings.setupCompleted ?? false,
    name: settings.name,
    address: settings.address,
    street: settings.street, zip: settings.zip, city: settings.city, country: settings.country,
    email: settings.email, phone: settings.phone,
    iban: settings.iban, iban_type: settings.ibanType,
    mwst_nr: settings.mwst, mwst_rate: settings.mwstRate,
    default_hourly_rate: settings.defaultHourlyRate,
    default_wochenstunden: settings.defaultWochenstunden,
    default_ferien_wochen: settings.defaultFerienWochen,
    closed_months: settings.closedMonths || [],
    block_mai_tag: settings.blockMaiTag,
    protokoll_type_abbr: settings.protokollTypeAbbreviations || {},
    logo_url: settings.logoUrl,
    formats: pickKeys(settings, FORMAT_KEYS),
    page_margins: pickKeys(settings, PAGE_MARGIN_KEYS),
    ui: pickKeys(settings, UI_KEYS),
  }),

  studioRoles: (roles = [], studioId) =>
    (roles || []).map((r, i) => ({
      studio_id: studioId,
      id: r.id,
      label: r.label,
      rate: r.rate,
      sort: i,
    })),

  person: (p, studioId) => ({
    id: p.id,
    // Geteilte Person bleibt global (studio_id NULL); lokale Person hängt am Studio.
    studio_id: p.isShared ? null : studioId,
    name: p.name,
    person_type: p.type,
    is_auftraggeber: !!p.isAuftraggeber,
    is_partner: !!p.isPartner,
    street: p.street, zip: p.zip, city: p.city, country: p.country,
    email: p.email || null, phone: p.phone, website: p.website,
    note: p.note,
    contacts: p.contacts || [],
    honorar_offers: p.honorar_offers || [],
  }),

  project: (p, studioId) => ({
    id: p.id,
    studio_id: studioId,
    number: p.number,
    name: p.name,
    client_id: p.clientId || null,
    category: p.category,
    billing_type: p.billingType,
    hourly_rate: p.hourlyRate,
    budget: p.budget,
    budget_hours: p.budgetHours,
    status: p.status || "aktiv",
    description: p.description,
    start_date: p.startDate || null,
    enabled_phases: p.enabledPhases || [],
    positions: p.positions || [],
    custom_phases: p.customPhases || [],
    project_contacts: p.projectContacts || [],
    internal_members: p.internalMembers || [],
  }),

  projectQuoteLinks: (projects = []) =>
    (projects || []).flatMap(p =>
      (p.linkedQuotes || []).map(lq => ({
        project_id: p.id,
        quote_id: lq.quoteId,
        role: lq.role || null,
      }))
    ),

  quote: (q, studioId) => ({
    id: q.id,
    studio_id: studioId,
    number: q.number,
    client_id: q.clientId || null,
    project_id: q.projectId || null,
    project_name: q.projectName,
    date: q.date || null,
    valid_until: q.validUntil || null,
    mode: q.mode,
    mwst: q.mwst,
    notes: q.notes,
    status: q.status || "entwurf",
    sia_config: q.sia || null,
    manual_phases: q.manualPhases || null,
    free_items: q.freeItems || null,
    quote_roles: q.quoteRoles || null,
  }),

  invoice: (inv, studioId) => ({
    id: inv.id,
    studio_id: studioId,
    number: inv.number,
    client_id: inv.clientId || null,
    contact_id: inv.contactId || null,
    project_id: inv.projectId || null,
    quote_id: inv.quoteId || null,
    date: inv.date || null,
    due_date: inv.dueDate || null,
    sent_date: inv.sentDate || null,
    paid_date: inv.paidDate || null,
    items: inv.items || [],
    mwst: inv.mwst,
    mwst_rate: inv.mwstRate,
    notes: inv.notes,
    status: inv.status || "entwurf",
    invoice_kind: inv.invoiceKind,
    discount_type: inv.discountType || "none",
    discount_value: inv.discountValue || 0,
    discount_label: inv.discountLabel,
    entry_selections: inv.entrySelections || {},
    qr_reference: inv.qrReference,
  }),

  invoiceReminders: (invoices = []) =>
    (invoices || []).flatMap(inv =>
      (inv.reminders || []).map(rem => ({
        invoice_id: inv.id,
        nr: rem.nr,
        date: rem.date,
        sent_date: rem.sentDate || null,
        days_past: rem.daysPast,
        note: rem.note,
      }))
    ),

  expense: (e, studioId) => ({
    id: e.id,
    studio_id: studioId,
    employee_id: e.employeeId || null,
    project_id: e.projectId || null,
    date: e.date,
    category: e.category,
    description: e.description,
    amount: e.amount,
    mwst_rate: e.mwstRate,
    incl_mwst: e.inclMwst,
    status: e.status || "offen",
    receipt_url: e.receiptUrl || null,
    receipt_name: e.receiptName,
    lohn_entry_id: e.lohnEntryId || null,
  }),

  internalExpense: (e, studioId) => ({
    id: e.id,
    studio_id: studioId,
    date: e.date,
    category: e.category,
    description: e.description,
    amount: e.amount,
    mwst_rate: e.mwstRate,
    incl_mwst: e.inclMwst,
    recurring: !!e.recurring,
    recurring_interval: e.recurringInterval || null,
    receipt_url: e.receiptUrl || null,
  }),

  timeEntry: (t, studioId) => ({
    id: t.id,
    studio_id: studioId,
    employee_id: t.employeeId || null,
    project_id: t.projectId || null,
    phase_id: t.phaseId || null,
    position_id: t.positionId || null,
    date: t.date,
    minutes: t.minutes,
    start_time: t.startTime || null,
    end_time: t.endTime || null,
    description: t.description,
  }),

  employee: (e, studioId) => ({
    id: e.id,
    studio_id: studioId,
    name: e.name,
    personal_nr: e.personalNr,
    pensum: e.pensum,
    wochenstunden: e.wochenstunden,
    ferien_wochen: e.ferienWochen,
    pk_ag_satz: e.pkAGSatz,
    ferien_uebertrag_vorjahr: e.ferienUebertragVorjahr || {},
    app_user_id: e._appUserId || null,
    active: e.active ?? true,
  }),

  absence: (a, studioId) => ({
    id: a.id,
    studio_id: studioId,
    employee_id: a.employeeId,
    type_id: a.type || null,
    date: a.date || null,
    date_from: a.dateFrom || null,
    date_to: a.dateTo || null,
    start_time: a.startTime || null,
    end_time: a.endTime || null,
    hours: a.hours,
    minutes: a.minutes,
    note: a.note,
    status: a.status || "pending",
  }),

  vacationEntry: (v, studioId) => ({
    id: v.id,
    studio_id: studioId,
    employee_id: v.employeeId,
    date_from: v.dateFrom,
    date_to: v.dateTo,
    note: v.note,
    status: v.status || "pending",
    original_data: v.originalData || null,
  }),

  payrollEntry: (p, studioId) => ({
    id: p.id,
    studio_id: studioId,
    employee_id: p.employeeId,
    year: p.year,
    month: p.month,
    brutto: p.brutto, ahv: p.ahv, alv: p.alv, bvg: p.bvg,
    nbu: p.nbu, ktg: p.ktg,
    quellensteuer: p.quellensteuer,
    spesen: p.spesen, bonus: p.bonus, netto: p.netto,
    status: p.status || "entwurf",
    paid_at: p.paidAt || null,
  }),

  overtimeClosing: (o, studioId) => ({
    id: o.id,
    studio_id: studioId,
    employee_id: o.employeeId,
    date: o.date,
    saldo_hours: o.saldoHours,
  }),

  holiday: (h, studioId) => ({
    studio_id: studioId,
    date: h.date,
    label: h.label,
    half_day: !!h.halfDay,
  }),

  absenceType: (t, studioId) => ({
    studio_id: studioId,
    id: t.id,
    label: t.label,
    color: t.color,
  }),

  letterTemplate: (t, studioId) => ({
    studio_id: studioId,
    id: t.id,
    name: t.name,
    body: t.body,
  }),

  appRole: (r, studioId) => ({
    studio_id: studioId,
    id: r.id,
    name: r.name,
    permissions: r.permissions,
    dashboard_template_id: r.dashboardTemplateId || null,
  }),

  dashboardTemplate: (d, studioId) => ({
    studio_id: studioId,
    id: d.id,
    name: d.name,
    is_public: d.isPublic ?? true,
    layout: d.layout || [],
  }),

  protocol: (p, studioId) => ({
    id: p.id,
    studio_id: studioId,
    number: p.number,
    type: p.type,
    location: p.location,
    project_id: p.projectId || null,
    project_manual: p.projectManual,
    participants: p.participants || [],
    traktanden: p.traktanden || [],
    next_date: p.nextDate || null,
    verteiler: p.verteiler,
  }),

  deliveryNote: (d, studioId) => ({
    id: d.id,
    studio_id: studioId,
    number: d.number,
    date: d.date || null,
    client_id: d.clientId || null,
    project_id: d.projectId || null,
    notes: d.notes,
  }),

  deliveryNoteItems: (deliveryNotes = []) =>
    (deliveryNotes || []).flatMap(dn =>
      (dn.items || []).map((it, i) => ({
        id: it.id,
        delivery_note_id: dn.id,
        sort: i,
        description: it.desc,
        qty: it.qty,
        unit: it.unit,
        note: it.note,
      }))
    ),

  blogPost: (b, studioId) => ({
    id: b.id,
    studio_id: studioId,
    author_id: b.authorId || null,
    category: b.category,
    title: b.title,
    body: b.body,
    pinned: !!b.pinned,
  }),
};