/**
 * App-level settings stored in Shop.settings (JSON). Engine settings + widget + messaging.
 * Shared by server and admin UI (no server-only imports here).
 */
import { z } from "zod";
import type { ShopSettings } from "../engine/types";

export interface WidgetSettings {
  heading: string;
  labels: { pickup: string; delivery: string; shipping: string };
  accent: string;
  dateFormat: "short" | "long";
  showRemaining: boolean;
  /** Show the calendar inside the cart drawer too (app embed). */
  drawer: boolean;
  /** Per-locale overrides of customer-facing text. */
  translations: Record<string, Partial<{ heading: string; pickup: string; delivery: string; shipping: string }>>;
}

export interface CheckoutFunctions {
  guard: boolean;
  delivery: boolean;
  payment: boolean;
}

export interface AppSettings extends ShopSettings {
  /** Block checkout (validation function) until a time is chosen. */
  requireScheduling: boolean;
  /** Minutes a freed place is held for the first person on a waitlist. */
  waitlistOfferMinutes: number;
  /** Return capacity when an order is cancelled. */
  releaseOnCancel: boolean;
  locationRanking: "priority" | "distance" | "earliest";
  /** Which checkout functions the merchant turned on. Shopify deletes them on uninstall; a reinstall restores these. */
  checkoutFunctions: CheckoutFunctions;
  widget: WidgetSettings;
  messaging: {
    emailFromName: string;
    replyTo?: string;
    /** Encrypted with APP_ENCRYPTION_KEY (services/crypto.server.ts). */
    twilio?: { accountSid: string; authTokenEnc: string; from: string } | null;
    whatsapp?: { phoneNumberId: string; tokenEnc: string; templateName: string; templateLang: string } | null;
  };
}

export const DEFAULT_SETTINGS: AppSettings = {
  mixedPrepPolicy: "longest",
  holdMinutes: 10,
  weekStartsOn: 0,
  reschedule: { enabled: true, minHoursBefore: 24, maxChanges: 2, allowMethodChange: false },
  reminders: [
    {
      id: "day-before",
      channel: "email",
      minutesBefore: 1440,
      enabled: true,
      template: "Hi {{name}}, a reminder that your {{method}} for order {{order}} is on {{date}}, {{time}}. Need a different time? Use the link on your order page.",
    },
    {
      id: "out-for-delivery",
      channel: "sms",
      minutesBefore: 90,
      methods: ["delivery"],
      enabled: false,
      template: "{{name}}, order {{order}} arrives today {{time}}.",
    },
  ],
  requireScheduling: true,
  waitlistOfferMinutes: 30,
  releaseOnCancel: true,
  locationRanking: "priority",
  checkoutFunctions: { guard: false, delivery: false, payment: false },
  widget: {
    heading: "When would you like it?",
    labels: { pickup: "Store pickup", delivery: "Local delivery", shipping: "Shipping" },
    accent: "#0D6B5D",
    dateFormat: "short",
    showRemaining: true,
    drawer: true,
    translations: {},
  },
  messaging: { emailFromName: "", twilio: null, whatsapp: null },
};

/** Deep-merge stored settings over defaults so new keys appear after upgrades. */
export function withDefaults(stored: unknown): AppSettings {
  const s = (stored ?? {}) as Partial<AppSettings>;
  return {
    ...DEFAULT_SETTINGS,
    ...s,
    reschedule: { ...DEFAULT_SETTINGS.reschedule, ...(s.reschedule ?? {}) },
    checkoutFunctions: { ...DEFAULT_SETTINGS.checkoutFunctions, ...(s.checkoutFunctions ?? {}) },
    widget: {
      ...DEFAULT_SETTINGS.widget,
      ...(s.widget ?? {}),
      labels: { ...DEFAULT_SETTINGS.widget.labels, ...(s.widget?.labels ?? {}) },
    },
    messaging: { ...DEFAULT_SETTINGS.messaging, ...(s.messaging ?? {}) },
    reminders: s.reminders ?? DEFAULT_SETTINGS.reminders,
  };
}

const hhmm = z.string().regex(/^([01]\d|2[0-3]):[0-5]\d$/, "Use 24-hour HH:MM");
const ymd = z.string().regex(/^\d{4}-\d{2}-\d{2}$/, "Use YYYY-MM-DD");
const method = z.enum(["pickup", "delivery", "shipping"]);
const range = z.object({ start: hhmm, end: hhmm }).refine((r) => r.start < r.end, "End must be after start");

export const MethodConfigSchema = z.object({
  enabled: z.boolean(),
  weeklyHours: z.record(z.string(), z.array(range)),
  slotMode: z.enum(["generated", "explicit", "dateOnly"]),
  slotMinutes: z.number().int().min(15).max(720).optional(),
  slots: z
    .record(z.string(), z.array(range.and(z.object({ capacity: z.number().int().min(0).nullable().optional(), surcharge: z.number().int().min(0).optional() }))))
    .optional(),
  prepMinutes: z.number().int().min(0).max(60 * 24 * 60),
  prepMode: z.enum(["elapsed", "operating"]),
  sameDayCutoff: hhmm.nullable().optional(),
  nextDayCutoff: hhmm.nullable().optional(),
  horizonDays: z.number().int().min(1).max(365),
  dailyCapacity: z.number().int().min(0).nullable().optional(),
  slotCapacity: z.number().int().min(0).nullable().optional(),
});

export const ExceptionSchema = z.object({
  date: ymd,
  closed: z.boolean().optional(),
  hours: z.array(range).optional(),
  methods: z.array(method).optional(),
  note: z.string().max(200).optional(),
});

export const ZoneSchema = z.object({
  id: z.string().min(1),
  name: z.string().min(1),
  postalPatterns: z.array(z.string()).optional(),
  radiusKm: z.number().positive().nullable().optional(),
  drivingKm: z.number().positive().nullable().optional(),
  fee: z.number().int().min(0),
  freeOver: z.number().int().min(0).nullable().optional(),
  minOrder: z.number().int().min(0).nullable().optional(),
});

export const RuleTargetSchema = z.object({
  type: z.enum(["product", "variant", "collection", "vendor", "productType", "tag"]),
  values: z.array(z.string().min(1)).min(1),
});

export const RuleActionSchema = z.discriminatedUnion("type", [
  z.object({ type: z.literal("prohibitMethods"), methods: z.array(method).min(1) }),
  z.object({ type: z.literal("allowOnlyMethods"), methods: z.array(method).min(1) }),
  z.object({ type: z.literal("restrictLocations"), locationIds: z.array(z.string()).min(1) }),
  z.object({ type: z.literal("addPrep"), minutes: z.number().int().min(1) }),
  z.object({ type: z.literal("blockWeekdays"), weekdays: z.array(z.number().int().min(0).max(6)).min(1) }),
  z.object({ type: z.literal("blockDates"), dates: z.array(ymd).min(1) }),
  z.object({ type: z.literal("dateWindow"), from: ymd.optional(), to: ymd.optional() }),
  z.object({
    type: z.literal("freshness"),
    arrivals: z.array(z.object({ date: ymd, locationIds: z.array(z.string()).optional() })),
    minDaysAfterArrival: z.number().int().min(0),
    shelfLifeDays: z.number().int().min(1),
  }),
  z.object({ type: z.literal("requireScheduling") }),
]);

export const SelectionAttrSchema = z.object({
  t: z.string().min(8).max(80), // hold token
  m: method,
  l: z.string(),
  d: ymd,
  s: z.string().regex(/^\d\d:\d\d-\d\d:\d\d$/),
  f: z.number().int().min(0).default(0), // fee (minor units)
  v: z.number().int().optional(), // config version
});
export type SelectionAttr = z.infer<typeof SelectionAttrSchema>;
export const SELECTION_ATTR = "_datewise";