import type {
  CompletionDocStatus,
  WorkOrderUpliftSummary,
} from "@/domain/work-orders/types/work-order-table-row";
import type { WOType, WorkOrderWizardDraft } from "@/domain/work-orders/types/work-order-wizard";

/** Fields required to evaluate whether a WO may be marked Completed (SH-114 ∪ pending uplift). */
export type WoClosabilityInput = {
  dispatcherId: string;
  dispatcherName: string;
  /** Vendor/company assignment on the board row. */
  company: string;
  /** Technician name is informational and does not satisfy the vendor requirement. */
  tech: string;
  /** Work completed date (API CompletedDate). Empty until set. */
  completedDate: string;
  woNumber: string;
  pm: string;
  docStatus: CompletionDocStatus;
  mediaCount: number;
  type: WOType | "";
  upliftSummary?: WorkOrderUpliftSummary | null;
  hasPendingUplift?: boolean;
};

export const PENDING_UPLIFT_GAP = "Pending uplift approval";

/** SH-188 tooltip when Completed is blocked solely by a pending uplift. */
export const UPLIFT_PENDING_COMPLETED_TITLE =
  "This work order has an uplift pending approval and cannot be completed.";

/** Real (non-placeholder) WO number — non-empty and not an SH-prefixed draft id. */
export function isRealWoNumber(woNumber: string): boolean {
  const trimmed = woNumber.trim();
  if (!trimmed) {
    return false;
  }
  return !/^SH/i.test(trimmed);
}

export function hasPendingUplift(
  row: Pick<WoClosabilityInput, "upliftSummary" | "hasPendingUplift">,
): boolean {
  if (row.hasPendingUplift === true) {
    return true;
  }
  return (row.upliftSummary?.pendingCount ?? 0) > 0;
}

function hasDispatcher(row: Pick<WoClosabilityInput, "dispatcherId" | "dispatcherName">): boolean {
  return Boolean(row.dispatcherId.trim() || row.dispatcherName.trim());
}

function hasService(pm: string): boolean {
  return Boolean(pm.trim());
}

function hasCompletionDocument(docStatus: CompletionDocStatus): boolean {
  return docStatus === "Yes" || docStatus === "NN";
}

/**
 * Gaps that block Completed, in design hierarchy:
 * fields → uplift pending → completion document / photos.
 * (Scheduled-date gate is a separate design P1 — not in this module yet.)
 */
export function getClosabilityGaps(row: WoClosabilityInput): string[] {
  const gaps: string[] = [];

  if (!hasDispatcher(row)) {
    gaps.push("Dispatcher");
  }
  if (!row.company.trim()) {
    gaps.push("Company / vendor");
  }
  if (!row.completedDate.trim()) {
    gaps.push("Completed Date");
  }
  if (!isRealWoNumber(row.woNumber)) {
    gaps.push("WO number");
  }
  if (!hasService(row.pm)) {
    gaps.push("Service");
  }

  // Authoritative pending uplift (board pendingUpliftCount / hasPendingUplift) blocks completion.
  // Missing uplift fields mean no pending evidence until the board contract supplies the count.
  if (hasPendingUplift(row)) {
    gaps.push(PENDING_UPLIFT_GAP);
  }

  if (row.type === "PM" || row.type === "Overdue") {
    if (!hasCompletionDocument(row.docStatus)) {
      gaps.push("Completion document");
    }
  }

  if (row.type === "Emergency" || row.type === "Reactive") {
    if (row.mediaCount < 1) {
      gaps.push("At least 1 photo");
    }
  }

  return gaps;
}

export function formatClosabilityMissingTitle(gaps: string[]): string {
  if (gaps.length === 1 && gaps[0] === PENDING_UPLIFT_GAP) {
    return UPLIFT_PENDING_COMPLETED_TITLE;
  }
  return `Missing: ${gaps.join(", ")}`;
}

export type CompDocGateResult = { allowed: true } | { allowed: false; reason: string };

/**
 * Gate for completion-document generation. CompDocDialog (not yet on `dev`) should call this
 * before opening generate flow and surface `reason` when blocked.
 *
 * Intentionally omits the "Completion document" closability gap — generate is how that gap is filled.
 */
export function canGenerateCompDoc(row: WoClosabilityInput): CompDocGateResult {
  const gaps = getClosabilityGaps(row).filter((gap) => gap !== "Completion document");
  if (gaps.length > 0) {
    return { allowed: false, reason: formatClosabilityMissingTitle(gaps) };
  }
  return { allowed: true };
}

/** Map create-wizard draft onto the shared closability contract. */
export function wizardDraftToClosabilityInput(draft: WorkOrderWizardDraft): WoClosabilityInput {
  return {
    dispatcherId: draft.assigneeId,
    dispatcherName: draft.assigneeName,
    company: draft.vendorName,
    tech: draft.vendorName,
    completedDate: "",
    woNumber: draft.woNumber,
    pm: draft.pm,
    docStatus: "",
    mediaCount: 0,
    type: draft.type,
  };
}