// The crm module's pages, on the shell's F10 contract (docs/reference/app-kit.md): a loader the web shell
// runs on the server under `/<org>/<workspace>/<project>/crm`, and the view of what it returned.
//
//   /crm             the organization's parties, and the form that adds one
//   /crm/<partyId>   one party: how to reach it, and the form that adds a contact point
//
// Every read is a procedure through the same caller the API uses, and every label is translated in the
// loader. A refusal that is the platform's -- the service is not enabled for the organization, the
// deployment lacks a scope, the service did not answer -- is the page's own state, not an error page, in the
// kit's words for it (`businessServiceNotices` of `@conusai-kit/business/refusals`).

import { businessRefusalNotices, businessServiceNotices } from "@conusai-kit/business/refusals"
import { type Container, notFound, type TransportCaller } from "@conusai-kit/core"
import type { I18n } from "@conusai-kit/i18n"
import { type ProjectPage, type ProjectPageViewProps, projectPage } from "@conusai-kit/ui"
import { Can } from "@conusai-kit/ui/data"
import {
  DetailLayout,
  Page,
  PageHeader,
  type ServiceNotice,
  ServiceStatePage,
  serviceNotice,
} from "@conusai-kit/ui/patterns"
import type { ReactElement } from "react"
import { type ContactView, type PartyView, partyGet, partyList } from "../contract/index.js"
import { ContactForm, type ContactFormLabels } from "./contact-form.js"
import { Contacts, type ContactsLabels } from "./contacts.js"
import { contactFormLabels, contactsLabels, partyFormLabels, partyListLabels, type Translate } from "./labels.js"
import { PartyForm, type PartyFormLabels } from "./party-form.js"
import { PartyList, type PartyListLabels } from "./party-list.js"

/** The parties, and the form that adds one. */
export interface CrmListData {
  readonly kind: "list"
  readonly title: string
  readonly intro: string
  readonly form: PartyFormLabels
  readonly list: PartyListLabels
  readonly parties: { rows: PartyView[]; after?: string | undefined }
}

/** One party, its kind and country already in a sentence. */
export interface CrmPartyData {
  readonly kind: "party"
  readonly title: string
  readonly back: string
  readonly partyId: string
  readonly displayName: string
  readonly summary: string
  /** The note that the party is a member's account, when it is. */
  readonly linked?: string
  readonly contacts: readonly ContactView[]
  readonly contactLabels: ContactsLabels
  readonly form: ContactFormLabels
}

/** The service cannot answer: the notice in place of the page. */
export interface CrmStateData {
  readonly kind: "state"
  readonly title: string
  readonly notice: ServiceNotice
}

export type CrmPageData = CrmListData | CrmPartyData | CrmStateData

export type CrmPage = ProjectPage<TransportCaller, I18n, Container, CrmPageData>

/** A party id as the service mints it: one path segment. */
const PARTY_ID = /^[A-Za-z0-9][A-Za-z0-9_.:-]{0,63}$/

/** The party a path segment names; a segment that does not decode names none. */
function partyIdOf(segment: string): string {
  try {
    return decodeURIComponent(segment)
  } catch {
    throw notFound("no such page")
  }
}

export const crmPage: CrmPage = projectPage({
  async load({ slugs, segments, caller, i18n }): Promise<CrmPageData> {
    const t: Translate = (key, values) => i18n.message(`crm.${key}`, values)
    const title = t("title")
    const refusals = businessRefusalNotices(i18n.locale)

    const [segment, ...rest] = segments
    const partyId = segment === undefined ? undefined : partyIdOf(segment)
    if (rest.length > 0 || (partyId !== undefined && !PARTY_ID.test(partyId))) throw notFound("no such page")

    try {
      if (partyId === undefined) {
        return {
          kind: "list",
          title,
          intro: t("intro"),
          form: partyFormLabels(t, refusals),
          list: partyListLabels(t),
          parties: await caller.call(partyList, slugs),
        }
      }
      const { party, contacts } = await caller.call(partyGet, { ...slugs, partyId })
      return {
        kind: "party",
        title,
        back: t("party.back"),
        partyId: party.partyId,
        displayName: party.displayName,
        summary: `${t(`kinds.${party.kind}`)}, ${party.country}${party.legalName ? `, ${party.legalName}` : ""}`,
        ...(party.linked ? { linked: t("party.linked") } : {}),
        contacts,
        contactLabels: contactsLabels(t, contacts.length),
        form: contactFormLabels(t, refusals),
      }
    } catch (error) {
      const notice = serviceNotice(error, businessServiceNotices(i18n.locale))
      if (!notice) throw error
      return { kind: "state", title, notice }
    }
  },

  View({ slugs, data }: ProjectPageViewProps<CrmPageData>): ReactElement {
    const listHref = `/${slugs.org}/${slugs.workspace}/${slugs.project}/crm`
    if (data.kind === "state") return <ServiceStatePage title={data.title} notice={data.notice} />
    if (data.kind === "list") {
      return (
        <Page>
          <PageHeader title={data.title} description={data.intro} />
          <DetailLayout
            aside={
              <Can permission="crm.party.write">
                <PartyForm slugs={slugs} listHref={listHref} labels={data.form} />
              </Can>
            }
          >
            <PartyList slugs={slugs} seed={data.parties} listHref={listHref} labels={data.list} />
          </DetailLayout>
        </Page>
      )
    }
    return (
      <Page>
        <PageHeader title={data.displayName} description={data.summary} breadcrumb={<a href={listHref}>{data.back}</a>}>
          {data.linked ? <span>{data.linked}</span> : null}
        </PageHeader>
        <DetailLayout
          aside={
            <Can permission="crm.party.write">
              <ContactForm slugs={slugs} partyId={data.partyId} labels={data.form} />
            </Can>
          }
        >
          <Contacts contacts={data.contacts} labels={data.contactLabels} />
        </DetailLayout>
      </Page>
    )
  },
})