import { Play } from "lucide-react";
import { useCallback, useEffect, useState } from "react";
import {
  Button,
  Dialog,
  DialogForm,
  DialogSection,
  DismissibleAlert,
  FormField,
  FormGrid,
  LoadingIndicator,
  ToggleSwitch,
  type PlatformRouteContext
} from "@govoplan/core-webui";
import {
  listAssistedIntakeProfiles,
  startAssistedFormIntake,
  type AssistedIntakeContext,
  type FormIntakeProfile
} from "../../api/formsRuntime";


type AssistedIntakeDialogProps = {
  open: boolean;
  settings: PlatformRouteContext["settings"];
  language: string;
  onStarted: (instanceId: string) => void;
  onClose: () => void;
};

export default function AssistedIntakeDialog({
  open,
  settings,
  language,
  onStarted,
  onClose
}: AssistedIntakeDialogProps) {
  const [profiles, setProfiles] = useState<FormIntakeProfile[]>([]);
  const [profileId, setProfileId] = useState("");
  const [channel, setChannel] = useState<AssistedIntakeContext["channel"]>("counter");
  const [affectedPartyRef, setAffectedPartyRef] = useState("");
  const [representedPartyRef, setRepresentedPartyRef] = useState("");
  const [authorityBasis, setAuthorityBasis] = useState("self");
  const [purpose, setPurpose] = useState("");
  const [legalBasisRef, setLegalBasisRef] = useState("");
  const [consentBasis, setConsentBasis] = useState("");
  const [noticeGiven, setNoticeGiven] = useState(false);
  const [responsibleFunctionRef, setResponsibleFunctionRef] = useState("");
  const [accessibilityNeeds, setAccessibilityNeeds] = useState("");
  const [loading, setLoading] = useState(false);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState("");

  const load = useCallback(async (signal?: AbortSignal) => {
    setLoading(true);
    setError("");
    try {
      const result = await listAssistedIntakeProfiles(settings, signal);
      setProfiles(result.profiles);
      setProfileId((current) => current || result.profiles[0]?.profile_id || "");
    } finally {
      setLoading(false);
    }
  }, [settings]);

  useEffect(() => {
    if (!open) return undefined;
    const controller = new AbortController();
    void load(controller.signal).catch((reason) => {
      if ((reason as Error).name !== "AbortError") {
        setError(reason instanceof Error ? reason.message : "Assisted intake profiles could not be loaded.");
      }
    });
    return () => controller.abort();
  }, [load, open]);

  async function start() {
    if (!valid()) return;
    setBusy(true);
    setError("");
    try {
      const result = await startAssistedFormIntake(settings, {
        profileId,
        channel,
        affectedPartyRef: affectedPartyRef.trim(),
        representedPartyRef: representedPartyRef.trim() || undefined,
        authorityBasis,
        purpose: purpose.trim(),
        legalBasisRef: legalBasisRef.trim() || undefined,
        consentBasis: consentBasis.trim() || undefined,
        noticeGiven,
        responsibleFunctionRef: responsibleFunctionRef.trim(),
        language: language || "de",
        accessibilityNeeds: accessibilityNeeds.split(/[,\n]/).map((item) => item.trim()).filter(Boolean)
      });
      if (!result.instance) throw new Error("The assisted session was created without a Form instance.");
      onStarted(result.instance.instance_id);
    } catch (reason) {
      setError(reason instanceof Error ? reason.message : "The assisted intake could not be started.");
    } finally {
      setBusy(false);
    }
  }

  function valid() {
    return Boolean(
      profileId
      && affectedPartyRef.trim()
      && authorityBasis.trim()
      && purpose.trim()
      && responsibleFunctionRef.trim()
    );
  }

  return (
    <Dialog
      open={open}
      title="Start assisted intake"
      description="Capture who is acting, for whom, through which channel, and for what purpose before entering Form values."
      size="large"
      closeDisabled={busy}
      onClose={onClose}
      helpContextId="forms_runtime.assisted-intake"
      helpTopicId="forms_runtime.submissions"
      footer={
        <>
          <Button onClick={onClose} disabled={busy}>Cancel</Button>
          <Button variant="primary" onClick={() => void start()} disabled={busy || loading || !valid()}>
            <Play size={16} aria-hidden="true" />
            Start session
          </Button>
        </>
      }>
      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
      {loading && <LoadingIndicator label="Loading assisted intake profiles" />}
      {!loading && profiles.length === 0 &&
        <DismissibleAlert tone="info">
          No assisted intake profile is enabled. Ask a Forms Runtime administrator to add one for the published Form.
        </DismissibleAlert>
      }
      {!loading && profiles.length > 0 &&
        <DialogForm onSubmit={(event) => { event.preventDefault(); void start(); }}>
          <DialogSection>
            <FormGrid columns={2} gap="small" collapseAt="workspace">
              <FormField label="Published Form">
                <select value={profileId} onChange={(event) => setProfileId(event.target.value)} disabled={busy}>
                  {profiles.map((profile) =>
                    <option key={profile.profile_id} value={profile.profile_id}>
                      {profileTitle(profile)} · revision {profile.definition_ref.version}
                    </option>
                  )}
                </select>
              </FormField>
              <FormField label="Intake channel">
                <select value={channel} onChange={(event) => setChannel(event.target.value as AssistedIntakeContext["channel"])} disabled={busy}>
                  <option value="counter">Service counter</option>
                  <option value="telephone">Telephone</option>
                  <option value="paper">Paper</option>
                  <option value="email">Email</option>
                  <option value="mobile">Mobile service</option>
                  <option value="representative">Representative</option>
                  <option value="offline_import">Offline import</option>
                </select>
              </FormField>
              <FormField label="Affected party reference" help="Use the governed person or organization reference; do not enter a display name only.">
                <input value={affectedPartyRef} onChange={(event) => setAffectedPartyRef(event.target.value)} disabled={busy} required />
              </FormField>
              <FormField label="Represented party reference" help="Optional when the affected party is acting directly.">
                <input value={representedPartyRef} onChange={(event) => setRepresentedPartyRef(event.target.value)} disabled={busy} />
              </FormField>
              <FormField label="Authority basis">
                <select value={authorityBasis} onChange={(event) => setAuthorityBasis(event.target.value)} disabled={busy}>
                  <option value="self">Acting for self</option>
                  <option value="documented_representation">Documented representation</option>
                  <option value="legal_guardianship">Legal guardianship</option>
                  <option value="statutory_authority">Statutory authority</option>
                </select>
              </FormField>
              <FormField label="Responsible function reference">
                <input value={responsibleFunctionRef} onChange={(event) => setResponsibleFunctionRef(event.target.value)} disabled={busy} required />
              </FormField>
              <FormField label="Purpose">
                <input value={purpose} onChange={(event) => setPurpose(event.target.value)} disabled={busy} required />
              </FormField>
              <FormField label="Legal basis reference">
                <input value={legalBasisRef} onChange={(event) => setLegalBasisRef(event.target.value)} disabled={busy} />
              </FormField>
              <FormField label="Consent basis">
                <input value={consentBasis} onChange={(event) => setConsentBasis(event.target.value)} disabled={busy} />
              </FormField>
              <FormField label="Accessibility or communication support" help="Separate multiple needs with commas.">
                <input value={accessibilityNeeds} onChange={(event) => setAccessibilityNeeds(event.target.value)} disabled={busy} />
              </FormField>
            </FormGrid>
          </DialogSection>
          <DialogSection variant="inset">
            <ToggleSwitch
              label="Privacy and procedural notice was provided"
              checked={noticeGiven}
              onChange={setNoticeGiven}
              disabled={busy}
              help="Record the fact of notice here; retain any separately required evidence through its owning module."
            />
          </DialogSection>
        </DialogForm>
      }
    </Dialog>
  );
}

function profileTitle(profile: FormIntakeProfile): string {
  const title = profile.metadata.definition_title;
  return typeof title === "string" && title.trim()
    ? title
    : profile.definition_ref.label ?? profile.definition_ref.object_id;
}