import { campaignJsonForAttachmentPreview } from "../src/features/campaigns/utils/templatePreviewDraft";

function assert(condition: unknown, message = "assertion failed"): void {
  if (!condition) throw new Error(message);
}

function asRecord(value: unknown): Record<string, unknown> {
  return value && typeof value === "object" && !Array.isArray(value) ? value as Record<string, unknown> : {};
}

const draft = {
  recipients: {
    from: { name: "", email: "" },
    to: [{ name: "Bob", email: " bob@example.org " }, { name: "", email: "" }]
  },
  entries: {
    inline: [{
      id: "recipient-1",
      active: true,
      name: "",
      email: "",
      from: [],
      to: [{ name: "", email: "" }, { name: "Alice", email: " alice@example.org " }],
      cc: [],
      bcc: [],
      merge_to: false
    }],
    defaults: {
      name: "",
      email: "",
      to: [{ name: "", email: "" }],
      attachments: []
    }
  }
};

const normalized = campaignJsonForAttachmentPreview(draft);
const entries = asRecord(normalized.entries);
const inline = entries.inline as Record<string, unknown>[];
const entry = inline[0];
const to = entry.to as Record<string, unknown>[];
const defaults = asRecord(entries.defaults);
const recipients = asRecord(normalized.recipients);
const globalTo = recipients.to as Record<string, unknown>[];

assert(recipients.from === undefined, "empty global from object is stripped");
assert(globalTo.length === 1 && globalTo[0].email === "bob@example.org", "global recipient arrays are sanitized");
assert(entry.email === undefined, "empty legacy entry email is stripped");
assert(entry.name === undefined, "empty legacy entry name is stripped");
assert(Array.isArray(entry.from) && (entry.from as unknown[]).length === 0, "empty address arrays remain arrays");
assert(to.length === 1 && to[0].email === "alice@example.org", "empty recipient objects are removed and valid addresses are trimmed");
assert(defaults.email === undefined, "empty defaults email is stripped");
assert(Array.isArray(defaults.to) && (defaults.to as unknown[]).length === 0, "empty defaults recipients are removed");
assert((asRecord(draft.entries).inline as Record<string, unknown>[])[0].email === "", "original draft is not mutated");