'use client';

import { useMemo } from 'react';
import { useTranslations } from 'next-intl';
import { Button } from '@/components/ui/shared/Button';
import { Checkbox } from '@/components/ui/shared/Checkbox';
import { Dropdown } from '@/components/ui/shared/Dropdown';
import { SearchBar } from '@/components/ui/shared/SearchBar';
import { formatCaseSentSummary } from '@/components/treatment/caseSendLabel';
import { CaseSentLabel } from '@/components/ui/treatment/CaseSentLabel';
import { TREATMENT_TYPE_KEYS, treatmentTypeLabelKey } from '@/components/ui/treatment/treatmentTypeDisplay';
import type { LabCaseDraft, LinkedOrganizationOption, TreatmentDetailDraft } from '@/types/treatment';

interface LabCasesDispatchPanelProps {
  details: TreatmentDetailDraft[];
  labCases: LabCaseDraft[];
  labDependentCodes: Set<string>;
  activeLabCaseId: string | null;
  onActiveLabCaseChange: (id: string) => void;
  onLabCasesChange: (labCases: LabCaseDraft[]) => void;
  disabled: boolean;
  canEdit: boolean;
  orgs: LinkedOrganizationOption[];
  organizationSearch: string;
  onOrganizationSearchChange: (value: string) => void;
  recentOrganizationIds: string[];
  onRecentOrganizationPick: (orgId: string) => void;
  sendBusyId: string | null;
  onAddLabCase: () => void;
  onSendLabCase: (labCase: LabCaseDraft) => void;
}

function sentDetailClientIds(labCases: LabCaseDraft[]): Set<string> {
  const ids = new Set<string>();
  for (const lc of labCases) {
    if (!lc.sentAt) continue;
    for (const id of lc.detailClientIds) ids.add(id);
  }
  return ids;
}

function detailInOtherDraftShipment(
  detailClientId: string,
  labCases: LabCaseDraft[],
  activeLabCaseClientId: string,
): boolean {
  return labCases.some(
    (lc) =>
      !lc.sentAt &&
      lc.clientId !== activeLabCaseClientId &&
      lc.detailClientIds.includes(detailClientId),
  );
}

/** Lab-dependent details not yet sent to any lab. */
function unsentLabDetails(
  details: TreatmentDetailDraft[],
  labCases: LabCaseDraft[],
  labDependentCodes: Set<string>,
): TreatmentDetailDraft[] {
  const sent = sentDetailClientIds(labCases);
  return details.filter((d) => labDependentCodes.has(d.treatmentType) && !sent.has(d.clientId));
}

/** Unsent lab details not already assigned to another draft shipment. */
function detailsAvailableForNewShipment(
  details: TreatmentDetailDraft[],
  labCases: LabCaseDraft[],
  labDependentCodes: Set<string>,
): TreatmentDetailDraft[] {
  return unsentLabDetails(details, labCases, labDependentCodes).filter(
    (d) => !detailInOtherDraftShipment(d.clientId, labCases, ''),
  );
}

/** Details the user can pick for the active draft shipment. */
function selectableDetailsForDraftShipment(
  details: TreatmentDetailDraft[],
  labCases: LabCaseDraft[],
  labDependentCodes: Set<string>,
  activeLabCase: LabCaseDraft,
): TreatmentDetailDraft[] {
  const sent = sentDetailClientIds(labCases);
  return details.filter((d) => {
    if (!labDependentCodes.has(d.treatmentType)) return false;
    if (sent.has(d.clientId)) return false;
    if (activeLabCase.detailClientIds.includes(d.clientId)) return true;
    return !detailInOtherDraftShipment(d.clientId, labCases, activeLabCase.clientId);
  });
}

export function LabCasesDispatchPanel({
  details,
  labCases,
  labDependentCodes,
  activeLabCaseId,
  onActiveLabCaseChange,
  onLabCasesChange,
  disabled,
  canEdit,
  orgs,
  organizationSearch,
  onOrganizationSearchChange,
  recentOrganizationIds,
  onRecentOrganizationPick,
  sendBusyId,
  onAddLabCase,
  onSendLabCase,
}: LabCasesDispatchPanelProps) {
  const t = useTranslations('treatment');
  const activeLinkedOrganizations = orgs.filter((o) => o.active);
  const filteredOrganizations = (() => {
    const q = organizationSearch.trim().toLowerCase();
    if (!q) return activeLinkedOrganizations;
    return activeLinkedOrganizations.filter((o) => o.name.toLowerCase().includes(q));
  })();
  const recentOrganizations = recentOrganizationIds
    .map((id) => activeLinkedOrganizations.find((o) => o.id === id))
    .filter(Boolean) as LinkedOrganizationOption[];

  const labEligibleDetails = useMemo(
    () => details.filter((d) => labDependentCodes.has(d.treatmentType)),
    [details, labDependentCodes],
  );

  const canAddLabShipment = useMemo(
    () => detailsAvailableForNewShipment(details, labCases, labDependentCodes).length > 0,
    [details, labCases, labDependentCodes],
  );

  const activeLabCase =
    labCases.find((lc) => lc.clientId === activeLabCaseId) ?? labCases[0] ?? null;
  const sent = Boolean(activeLabCase?.sentAt);

  const activeLabOrgName = activeLabCase?.destinationOrganizationId
    ? orgs.find((o) => o.id === activeLabCase.destinationOrganizationId)?.name
    : null;

  function detailNumber(d: TreatmentDetailDraft) {
    const idx = details.findIndex((row) => row.clientId === d.clientId);
    return idx >= 0 ? idx + 1 : 0;
  }

  function detailSummary(d: TreatmentDetailDraft) {
    const typeKey = treatmentTypeLabelKey(d.treatmentType);
    const typeLabel =
      d.treatmentType in TREATMENT_TYPE_KEYS
        ? t(typeKey as 'typeEndo')
        : d.treatmentType;
    const teeth = d.teeth.length ? d.teeth.join(', ') : t('teethNone');
    return `${t('detailLabel', { n: detailNumber(d) })} · ${typeLabel} · ${teeth}`;
  }

  function updateActiveLabCase(patch: Partial<LabCaseDraft>) {
    if (!activeLabCase) return;
    onLabCasesChange(
      labCases.map((lc) => (lc.clientId === activeLabCase.clientId ? { ...lc, ...patch } : lc)),
    );
  }

  function toggleDetailInActiveLabCase(detailClientId: string, checked: boolean) {
    if (!activeLabCase || sent) return;

    onLabCasesChange(
      labCases.map((lc) => {
        if (lc.sentAt) return lc;

        if (lc.clientId === activeLabCase.clientId) {
          const set = new Set(lc.detailClientIds);
          if (checked) set.add(detailClientId);
          else set.delete(detailClientId);
          return { ...lc, detailClientIds: [...set] };
        }

        if (checked) {
          return {
            ...lc,
            detailClientIds: lc.detailClientIds.filter((id) => id !== detailClientId),
          };
        }
        return lc;
      }),
    );
  }

  if (labEligibleDetails.length === 0) {
    return (
      <div className="surface-card p-4 space-y-2">
        <h3 className="text-sm font-semibold text-text-primary">{t('labDispatchTitle')}</h3>
        <p className="text-xs text-text-muted">{t('noLabDetails')}</p>
      </div>
    );
  }

  const includedInActiveShipment = activeLabCase
    ? labEligibleDetails.filter((d) => activeLabCase.detailClientIds.includes(d.clientId))
    : [];

  const pickableForActiveDraft =
    activeLabCase && !sent
      ? selectableDetailsForDraftShipment(details, labCases, labDependentCodes, activeLabCase)
      : [];

  return (
    <div className="surface-card p-4 space-y-4">
      <div className="flex flex-wrap items-center justify-between gap-3">
        <div>
          <h3 className="text-sm font-semibold text-text-primary">{t('labDispatchTitle')}</h3>
          <p className="text-xs text-text-muted mt-0.5">
            {t('labDispatchSubtitle')} {t('labDispatchSendHint')}
          </p>
        </div>
        {canAddLabShipment && (
          <Button
            type="button"
            variant="primary"
            disabled={!canEdit || disabled}
            onClick={onAddLabCase}
          >
            {t('addLabShipment')}
          </Button>
        )}
      </div>

      {labCases.length === 0 ? (
        <p className="text-xs text-text-muted">{t('labDispatchEmpty')}</p>
      ) : (
        <>
          <div className="flex flex-wrap gap-2">
            {labCases.map((lc, idx) => {
              const sentSummary = formatCaseSentSummary(
                lc.sends,
                {
                  organizationIds: lc.destinationOrganizationId ? [lc.destinationOrganizationId] : [],
                  sentAt: lc.sentAt ?? null,
                  orgs,
                },
                t,
              );
              return (
                <button
                  key={lc.clientId}
                  type="button"
                  onClick={() => onActiveLabCaseChange(lc.clientId)}
                  className={`
                    rounded-[var(--radius-md)] border px-3 py-1.5 text-sm transition-colors
                    focus:outline-none focus-visible:ring-2 focus-visible:ring-primary/45
                    ${
                      lc.clientId === activeLabCase?.clientId
                        ? 'border-primary bg-primary-soft font-medium text-text-primary'
                        : 'border-border/70 text-text-secondary hover:border-border hover:bg-background-card/50'
                    }
                  `}
                >
                  {t('labShipmentLabel', { n: idx + 1 })}
                  {sentSummary ? ` · ${sentSummary}` : ''}
                </button>
              );
            })}
          </div>

          {activeLabCase && (
            <div className="space-y-4 border border-border/60 rounded-[var(--radius-md)] p-4 bg-background-secondary/30">
              {sent ? (
                <>
                  <div>
                    <p className="text-xs font-medium text-text-secondary mb-2">
                      {t('labShipmentIncludedDetails')}
                    </p>
                    {includedInActiveShipment.length === 0 ? (
                      <p className="text-xs text-text-muted">{t('labShipmentNoIncludedDetails')}</p>
                    ) : (
                      <ul className="space-y-1.5">
                        {includedInActiveShipment.map((d) => (
                          <li
                            key={d.clientId}
                            className="text-sm text-text-primary rounded-[var(--radius-sm)] border border-border/50 bg-background-secondary/50 px-3 py-2"
                          >
                            {detailSummary(d)}
                          </li>
                        ))}
                      </ul>
                    )}
                  </div>

                  {activeLabCase.labComment.trim() ? (
                    <div>
                      <p className="text-xs font-medium text-text-secondary">{t('labComment')}</p>
                      <p className="text-sm text-text-primary mt-1 whitespace-pre-wrap">
                        {activeLabCase.labComment}
                      </p>
                    </div>
                  ) : null}

                  {activeLabOrgName ? (
                    <div>
                      <p className="text-xs font-medium text-text-secondary">{t('selectLab')}</p>
                      <p className="text-sm text-text-primary mt-1">{activeLabOrgName}</p>
                    </div>
                  ) : null}

                  <CaseSentLabel
                    treatmentCase={{
                      destinationOrganizationId: activeLabCase.destinationOrganizationId,
                      sendToOrganizationIds: activeLabCase.destinationOrganizationId
                        ? [activeLabCase.destinationOrganizationId]
                        : [],
                      sentAt: activeLabCase.sentAt ?? null,
                      sends: activeLabCase.sends,
                    }}
                    orgs={orgs}
                  />
                </>
              ) : (
                <>
                  <div>
                    <p className="text-xs font-medium text-text-secondary mb-2">
                      {t('includeDetails')}
                    </p>
                    {pickableForActiveDraft.length === 0 ? (
                      <p className="text-xs text-text-muted">{t('labShipmentNoDetailsAvailable')}</p>
                    ) : (
                      <div className="flex flex-col gap-2">
                        {pickableForActiveDraft.map((d) => {
                          const checked = activeLabCase.detailClientIds.includes(d.clientId);
                          return (
                            <Checkbox
                              key={d.clientId}
                              checked={checked}
                              disabled={disabled}
                              onChange={(next) => toggleDetailInActiveLabCase(d.clientId, next)}
                              label={detailSummary(d)}
                            />
                          );
                        })}
                      </div>
                    )}
                  </div>

                  <label className="block text-xs font-medium text-text-secondary">
                    {t('labComment')}
                    <textarea
                      value={activeLabCase.labComment}
                      onChange={(e) => updateActiveLabCase({ labComment: e.target.value })}
                      placeholder={t('labCommentPlaceholder')}
                      rows={3}
                      disabled={disabled}
                      className="mt-1.5 w-full rounded-[var(--radius-md)] border border-border bg-background-secondary/90 text-text-primary text-sm px-3 py-2 placeholder:text-text-muted focus:outline-none focus:ring-2 focus:ring-primary/35 resize-y"
                    />
                  </label>

                  <div className="space-y-2">
                    <p className="text-xs font-medium text-text-secondary">{t('selectLab')}</p>
                    <SearchBar
                      embedded
                      value={organizationSearch}
                      onChange={onOrganizationSearchChange}
                      placeholder={t('searchOrgsPlaceholder')}
                    />
                    {recentOrganizations.length > 0 && (
                      <div className="flex flex-wrap items-center gap-2">
                        <span className="text-xs text-text-muted">{t('recent')}</span>
                        {recentOrganizations.map((o) => (
                          <button
                            key={o.id}
                            type="button"
                            disabled={disabled}
                            onClick={() => onRecentOrganizationPick(o.id)}
                            className="text-xs rounded-[var(--radius-sm)] border border-border/70 px-2 py-1 text-text-secondary hover:text-text-primary hover:border-border focus:outline-none focus-visible:ring-2 focus-visible:ring-primary/35 disabled:opacity-50"
                          >
                            {o.name}
                          </button>
                        ))}
                      </div>
                    )}
                    <Dropdown
                      value={activeLabCase.destinationOrganizationId ?? ''}
                      onChange={(e) =>
                        updateActiveLabCase({
                          destinationOrganizationId: e.target.value || null,
                        })
                      }
                      disabled={disabled || filteredOrganizations.length === 0}
                    >
                      <option value="">{t('selectLabPlaceholder')}</option>
                      {filteredOrganizations.map((o) => (
                        <option key={o.id} value={o.id}>
                          {o.name}
                        </option>
                      ))}
                    </Dropdown>
                    {filteredOrganizations.length === 0 && (
                      <p className="text-xs text-text-muted">{t('noOrgMatch')}</p>
                    )}
                  </div>

                  <div className="flex flex-wrap items-center gap-3 pt-1">
                    <Button
                      type="button"
                      variant="primary"
                      disabled={
                        disabled ||
                        sendBusyId === activeLabCase.clientId ||
                        !activeLabCase.destinationOrganizationId ||
                        activeLabCase.detailClientIds.length === 0
                      }
                      isLoading={sendBusyId === activeLabCase.clientId}
                      onClick={() => onSendLabCase(activeLabCase)}
                    >
                      {t('sendToLab')}
                    </Button>
                  </div>
                </>
              )}
            </div>
          )}
        </>
      )}
    </div>
  );
}
