import { ClaimCaseStatus } from "src/Types&Enums/claim-request-management/claim-case-status.enum";
import { ClaimStatus } from "src/Types&Enums/claim-request-management/claimStatus.enum";
import { ClaimWorkflowStep } from "src/Types&Enums/claim-request-management/claim-workflow-steps.enum";
import {
  classifyV2ExpertPricingParts,
  claimCaseStatusAllowsOwnerInsurerSignStep,
  claimCaseStatusIsV2OwnerPostExpertPipeline,
  getActiveV2ExpertReply,
  objectionDisallowedDueToOutstandingFactorWorkflow,
} from "src/helpers/claim-v2-expert-reply-workflow";

const BASE = "v2/claim-request-management";

/** One actionable next step for owner UI (`pathTemplate` embeds claim id; replace `{partId}` per line item). */
export interface ClaimDetailsOwnerNextActionV2 {
  key: string;
  method?: string;
  pathTemplate?: string;
  description: string;
}

/** Derived hints so the client can route without re-implementing server rules (returned only for claim owners, not FIELD_EXPERT). */
export interface ClaimDetailsOwnerGuidanceV2 {
  phaseKey: string;
  headline: string;
  detail?: string;
  nextActions: ClaimDetailsOwnerNextActionV2[];
  objectionAllowed?: boolean;
  objectionHint?: string;
}

function objectionWindowForOwner(claim: any): {
  pricingEligible: boolean;
  resendEligible: boolean;
} {
  const r = claim.evaluation?.damageExpertResend;
  const hasExpertResend = !!(
    r &&
    (String(r.resendDescription || "").trim() !== "" ||
      (Array.isArray(r.resendDocuments) && r.resendDocuments.length > 0) ||
      (Array.isArray(r.resendCarParts) && r.resendCarParts.length > 0))
  );

  const pendingResend =
    hasExpertResend &&
    claim.status === ClaimCaseStatus.WAITING_FOR_USER_RESEND &&
    claim.workflow?.currentStep === ClaimWorkflowStep.USER_EXPERT_RESEND;

  let pricingEligible = false;
  if (
    claimCaseStatusAllowsOwnerInsurerSignStep(claim.status) &&
    claim.workflow?.currentStep === ClaimWorkflowStep.INSURER_REVIEW &&
    !claim.evaluation?.ownerInsurerApproval?.signedAt
  ) {
    if (!objectionDisallowedDueToOutstandingFactorWorkflow(claim)) {
      const active = getActiveV2ExpertReply(
        claim as { evaluation?: Record<string, unknown> },
      );
      const shape = classifyV2ExpertPricingParts(active?.parts ?? []);
      const atMixed =
        claim.claimStatus === ClaimStatus.NEEDS_REVISION &&
        shape.mixedFactorAndPrice &&
        !claim.evaluation?.ownerPricedPartsApproval?.signedAt;
      const atFinal = claim.claimStatus === ClaimStatus.APPROVED;
      pricingEligible = atMixed || atFinal;
    }
  }

  return { pricingEligible, resendEligible: !!pendingResend };
}

/** Mirrors server rules for PUT .../objection (read-only hint for UI). */
export function ownerMaySubmitObjectionForClaimDetails(claim: any): boolean {
  if (claim.evaluation?.objection?.submittedAt) return false;
  if (claim.evaluation?.damageExpertReplyFinal) return false;
  const { pricingEligible, resendEligible } = objectionWindowForOwner(claim);
  if (resendEligible) return true;
  return (
    pricingEligible &&
    !claim.evaluation?.ownerInsurerApproval?.signedAt &&
    !objectionDisallowedDueToOutstandingFactorWorkflow(claim)
  );
}

function objectionHintWhen(allowed: boolean): string | undefined {
  return allowed
    ? "Optional: PUT v2/claim-request-management/request/{claimRequestId}/objection — only priced repair lines (`factorNeeded=false` in the expert reply)."
    : undefined;
}

/**
 * Build owner-facing guidance for GET claim details V2.
 * Caller should omit this field for FIELD_EXPERT viewers.
 */
export function buildClaimDetailsV2OwnerGuidance(
  claim: any,
  claimRequestId: string,
): ClaimDetailsOwnerGuidanceV2 {
  const id = claimRequestId;
  const act = (key: string, method: string, path: string, description: string) =>
    ({ key, method, pathTemplate: path, description });

  const objectionAllowed = ownerMaySubmitObjectionForClaimDetails(claim);
  const objectionHint = objectionHintWhen(objectionAllowed);

  if (claim.status === ClaimCaseStatus.COMPLETED) {
    return {
      phaseKey: "COMPLETED",
      headline: "Claim completed",
      detail:
        claim.userRating?.createdAt
          ? "Rating already submitted."
          : "You may submit a satisfaction rating once.",
      nextActions: [
        act(
          "USER_RATING",
          "PUT",
          `${BASE}/request/${id}/user-rating`,
          "Optional satisfaction rating",
        ),
      ],
      objectionAllowed: false,
    };
  }

  if (claim.status === ClaimCaseStatus.REJECTED || claim.claimStatus === ClaimStatus.REJECTED) {
    return {
      phaseKey: "REJECTED",
      headline: "Claim rejected",
      detail: "This case is closed as rejected.",
      nextActions: [],
      objectionAllowed: false,
    };
  }

  if (claim.status === ClaimCaseStatus.CANCELLED) {
    return {
      phaseKey: "CANCELLED",
      headline: "Claim cancelled",
      nextActions: [],
      objectionAllowed: false,
    };
  }

  if (claim.status === ClaimCaseStatus.WAITING_FOR_USER_RESEND) {
    return {
      phaseKey: "EXPERT_RESEND",
      headline: "Expert requested more information",
      detail:
        "Upload requested documents or damaged-part photos, or acknowledge if the expert gave instructions only.",
      nextActions: [
        act(
          "UPLOAD_DOC",
          "POST",
          `${BASE}/upload-document/${id}`,
          "Multipart: required document upload",
        ),
        act(
          "CAPTURE_PART",
          "POST",
          `${BASE}/capture-part/${id}`,
          "Multipart: damaged-part or angle capture",
        ),
        act(
          "RESEND_ACK",
          "POST",
          `${BASE}/request/${id}/expert-resend/acknowledge`,
          "If no document/part list — instructions only",
        ),
      ],
      objectionAllowed: ownerMaySubmitObjectionForClaimDetails(claim),
      objectionHint: objectionHintWhen(ownerMaySubmitObjectionForClaimDetails(claim)),
    };
  }

  if (claim.status === ClaimCaseStatus.WAITING_FOR_DAMAGE_EXPERT) {
    return {
      phaseKey: "WAITING_DAMAGE_EXPERT",
      headline: "Waiting for damage expert",
      detail: "Your file is in the expert queue.",
      nextActions: [],
      objectionAllowed: false,
    };
  }

  if (claim.status === ClaimCaseStatus.EXPERT_REVIEWING) {
    return {
      phaseKey: "EXPERT_REVIEWING",
      headline: "Expert is reviewing",
      detail: "A damage expert is assessing your claim.",
      nextActions: [],
      objectionAllowed: false,
    };
  }

  if (!claimCaseStatusIsV2OwnerPostExpertPipeline(claim.status)) {
    return {
      phaseKey: "USER_FLOW",
      headline: "Continue your claim registration",
      detail: "Complete remaining selection, captures, documents, or bank info.",
      nextActions: [
        act(
          "CAPTURE_REQUIREMENTS",
          "GET",
          `${BASE}/capture-requirements/${id}`,
          "Shows remaining angles, parts, documents",
        ),
        act(
          "UPLOAD_DOC",
          "POST",
          `${BASE}/upload-document/${id}`,
          "Upload required document when workflow allows",
        ),
        act(
          "CAPTURE_PART",
          "POST",
          `${BASE}/capture-part/${id}`,
          "Upload angle or damaged-part photo when workflow allows",
        ),
      ],
      objectionAllowed: false,
    };
  }

  const step = claim.workflow?.currentStep;
  const cs = claim.claimStatus;

  if (step === ClaimWorkflowStep.OWNER_UPLOAD_FACTOR_DOCUMENTS && cs === ClaimStatus.NEEDS_REVISION) {
    return {
      phaseKey: "UPLOAD_FACTORS",
      headline: "Upload repair factor files",
      detail:
        "One upload per factor-needed part. When all factors are uploaded, the expert validates costs.",
      nextActions: [
        act(
          "UPLOAD_FACTOR",
          "PATCH",
          `${BASE}/request/reply/${id}/{partId}/upload-factor`,
          "Multipart `file` — use each expert reply `partId` with factorNeeded=true",
        ),
      ],
      objectionAllowed: false,
    };
  }

  if (step === ClaimWorkflowStep.EXPERT_COST_EVALUATION && cs === ClaimStatus.UNDER_REVIEW) {
    return {
      phaseKey: "EXPERT_VALIDATING_FACTORS",
      headline: "Expert is validating factors",
      detail: "No owner action until the expert finishes validating repair-factor pricing.",
      nextActions: [],
      objectionAllowed: false,
    };
  }

  if (step === ClaimWorkflowStep.INSURER_REVIEW) {
    if (cs === ClaimStatus.NEEDS_REVISION) {
      const active = getActiveV2ExpertReply(
        claim as { evaluation?: Record<string, unknown> },
      );
      const shape = classifyV2ExpertPricingParts(active?.parts ?? []);
      if (
        shape.mixedFactorAndPrice &&
        !claim.evaluation?.ownerPricedPartsApproval?.signedAt
      ) {
        const ow = objectionWindowForOwner(claim);
        const allowObj = ow.pricingEligible;
        return {
          phaseKey: "SIGN_PRICED_LINES",
          headline: "Sign acceptance of priced lines",
          detail:
            "Required before uploading repair-factor files for mixed priced + factor-needed replies.",
          nextActions: [
            act(
              "SIGN_PRICED_PARTS",
              "PUT",
              `${BASE}/request/${id}/owner-insurer-approval/sign`,
              "Multipart sign + agree + branchId",
            ),
          ],
          objectionAllowed: allowObj,
          objectionHint: objectionHintWhen(allowObj),
        };
      }

      /** NEEDS_REVISION at INSURER_REVIEW without mixed gate — all-factor initial sign not used; fallback */
      const allowObj = objectionWindowForOwner(claim).pricingEligible;
      return {
        phaseKey: "INSURER_REVIEW_NEEDS_REVISION",
        headline: "Insurer approval — action pending",
        detail:
          "If you see priced lines without factors, use sign or objection; otherwise verify workflow data.",
        nextActions: [
          act(
            "SIGN_OR_CHECK",
            "PUT",
            `${BASE}/request/${id}/owner-insurer-approval/sign`,
            "Sign if prompted by app state",
          ),
        ],
        objectionAllowed: allowObj,
        objectionHint: objectionHintWhen(allowObj),
      };
    }

    if (cs === ClaimStatus.APPROVED && !claim.evaluation?.ownerInsurerApproval?.signedAt) {
      const allowObj = objectionWindowForOwner(claim).pricingEligible;
      return {
        phaseKey: "FINAL_SIGN_OR_REJECT",
        headline: "Accept or reject final pricing",
        detail: "Sign to complete the claim, or reject. You may object to priced lines instead of signing.",
        nextActions: [
          act(
            "FINAL_SIGN",
            "PUT",
            `${BASE}/request/${id}/owner-insurer-approval/sign`,
            "Multipart sign + agree + branchId — completes or rejects claim",
          ),
          act(
            "OBJECTION",
            "PUT",
            `${BASE}/request/${id}/objection`,
            "Dispute priced lines before signing",
          ),
        ],
        objectionAllowed: allowObj,
        objectionHint: objectionHintWhen(allowObj),
      };
    }
  }

  return {
    phaseKey: "INSURER_APPROVAL_FALLBACK",
    headline: "Awaiting next step",
    detail:
      "Inspect `status`, `claimStatus`, `workflow.currentStep`/`nextStep` or contact support.",
    nextActions: [],
    objectionAllowed,
    objectionHint,
  };
}