import { permissions } from "@mrp/shared";
import type { WorkOrderCompletionInput, WorkOrderDetailDto, WorkOrderMaterialIssueInput, WorkOrderStatus } from "@mrp/shared";
import type { WarehouseLocationOptionDto } from "@mrp/shared/dist/inventory/types.js";
import { useEffect, useMemo, useState } from "react";
import { Link, useParams } from "react-router-dom";

import { FileAttachmentsPanel } from "../../components/FileAttachmentsPanel";
import { useAuth } from "../../auth/AuthProvider";
import { api, ApiError } from "../../lib/api";
import { emptyCompletionInput, emptyMaterialIssueInput, workOrderStatusOptions } from "./config";
import { WorkOrderStatusBadge } from "./WorkOrderStatusBadge";

export function WorkOrderDetailPage() {
  const { token, user } = useAuth();
  const { workOrderId } = useParams();
  const [workOrder, setWorkOrder] = useState<WorkOrderDetailDto | null>(null);
  const [locationOptions, setLocationOptions] = useState<WarehouseLocationOptionDto[]>([]);
  const [issueForm, setIssueForm] = useState<WorkOrderMaterialIssueInput>(emptyMaterialIssueInput);
  const [completionForm, setCompletionForm] = useState<WorkOrderCompletionInput>(emptyCompletionInput);
  const [status, setStatus] = useState("Loading work order...");
  const [isUpdatingStatus, setIsUpdatingStatus] = useState(false);
  const [isPostingIssue, setIsPostingIssue] = useState(false);
  const [isPostingCompletion, setIsPostingCompletion] = useState(false);

  const canManage = user?.permissions.includes(permissions.manufacturingWrite) ?? false;

  useEffect(() => {
    if (!token || !workOrderId) {
      return;
    }

    api.getWorkOrder(token, workOrderId)
      .then((nextWorkOrder) => {
        setWorkOrder(nextWorkOrder);
        setIssueForm({
          ...emptyMaterialIssueInput,
          warehouseId: nextWorkOrder.warehouseId,
          locationId: nextWorkOrder.locationId,
        });
        setCompletionForm({
          ...emptyCompletionInput,
          quantity: Math.max(nextWorkOrder.dueQuantity, 1),
        });
        setStatus("Work order loaded.");
      })
      .catch((error: unknown) => {
        const message = error instanceof ApiError ? error.message : "Unable to load work order.";
        setStatus(message);
      });

    api.getWarehouseLocationOptions(token).then(setLocationOptions).catch(() => setLocationOptions([]));
  }, [token, workOrderId]);

  const filteredLocationOptions = useMemo(
    () => locationOptions.filter((option) => option.warehouseId === issueForm.warehouseId),
    [issueForm.warehouseId, locationOptions]
  );

  async function handleStatusChange(nextStatus: WorkOrderStatus) {
    if (!token || !workOrder) {
      return;
    }

    setIsUpdatingStatus(true);
    setStatus("Updating work-order status...");
    try {
      const nextWorkOrder = await api.updateWorkOrderStatus(token, workOrder.id, nextStatus);
      setWorkOrder(nextWorkOrder);
      setStatus("Work-order status updated.");
    } catch (error: unknown) {
      const message = error instanceof ApiError ? error.message : "Unable to update work-order status.";
      setStatus(message);
    } finally {
      setIsUpdatingStatus(false);
    }
  }

  async function handleIssueSubmit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (!token || !workOrder) {
      return;
    }

    setIsPostingIssue(true);
    setStatus("Posting material issue...");
    try {
      const nextWorkOrder = await api.issueWorkOrderMaterial(token, workOrder.id, issueForm);
      setWorkOrder(nextWorkOrder);
      setIssueForm({
        ...emptyMaterialIssueInput,
        warehouseId: nextWorkOrder.warehouseId,
        locationId: nextWorkOrder.locationId,
      });
      setStatus("Material issue posted.");
    } catch (error: unknown) {
      const message = error instanceof ApiError ? error.message : "Unable to post material issue.";
      setStatus(message);
    } finally {
      setIsPostingIssue(false);
    }
  }

  async function handleCompletionSubmit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (!token || !workOrder) {
      return;
    }

    setIsPostingCompletion(true);
    setStatus("Posting completion...");
    try {
      const nextWorkOrder = await api.recordWorkOrderCompletion(token, workOrder.id, completionForm);
      setWorkOrder(nextWorkOrder);
      setCompletionForm({
        ...emptyCompletionInput,
        quantity: Math.max(nextWorkOrder.dueQuantity, 1),
      });
      setStatus("Completion posted.");
    } catch (error: unknown) {
      const message = error instanceof ApiError ? error.message : "Unable to post completion.";
      setStatus(message);
    } finally {
      setIsPostingCompletion(false);
    }
  }

  if (!workOrder) {
    return <div className="rounded-[28px] border border-line/70 bg-surface/90 p-4 text-sm text-muted shadow-panel">{status}</div>;
  }

  return (
    <section className="space-y-4">
      <div className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <div className="flex flex-col gap-3 lg:flex-row lg:items-start lg:justify-between">
          <div>
            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Work Order</p>
            <h3 className="mt-2 text-xl font-bold text-text">{workOrder.workOrderNumber}</h3>
            <p className="mt-1 text-sm text-text">{workOrder.itemSku} - {workOrder.itemName}</p>
            <div className="mt-3"><WorkOrderStatusBadge status={workOrder.status} /></div>
          </div>
          <div className="flex flex-wrap gap-3">
            <Link to="/manufacturing/work-orders" className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text">Back to work orders</Link>
            {workOrder.projectId ? <Link to={`/projects/${workOrder.projectId}`} className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text">Open project</Link> : null}
            {workOrder.salesOrderId ? <Link to={`/sales/orders/${workOrder.salesOrderId}`} className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text">Open sales order</Link> : null}
            <Link to={`/inventory/items/${workOrder.itemId}`} className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text">Open item</Link>
            {canManage ? <Link to={`/manufacturing/work-orders/${workOrder.id}/edit`} className="inline-flex items-center justify-center rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white">Edit work order</Link> : null}
          </div>
        </div>
      </div>
      {canManage ? (
        <section className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <div className="flex flex-col gap-3 lg:flex-row lg:items-center lg:justify-between">
            <div>
              <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Quick Actions</p>
              <p className="mt-2 text-sm text-muted">Release, hold, or close administrative status from the work-order record.</p>
            </div>
            <div className="flex flex-wrap gap-2">
              {workOrderStatusOptions.map((option) => (
                <button key={option.value} type="button" onClick={() => handleStatusChange(option.value)} disabled={isUpdatingStatus || workOrder.status === option.value} className="rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text disabled:cursor-not-allowed disabled:opacity-60">
                  {option.label}
                </button>
              ))}
            </div>
          </div>
        </section>
      ) : null}
      <section className="grid gap-3 xl:grid-cols-6">
        <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Planned</p><div className="mt-2 text-base font-bold text-text">{workOrder.quantity}</div></article>
        <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Completed</p><div className="mt-2 text-base font-bold text-text">{workOrder.completedQuantity}</div></article>
        <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Remaining</p><div className="mt-2 text-base font-bold text-text">{workOrder.dueQuantity}</div></article>
        <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Project</p><div className="mt-2 text-base font-bold text-text">{workOrder.projectNumber || "Unlinked"}</div></article>
        <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Operations</p><div className="mt-2 text-base font-bold text-text">{workOrder.operations.length}</div></article>
        <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Due Date</p><div className="mt-2 text-base font-bold text-text">{workOrder.dueDate ? new Date(workOrder.dueDate).toLocaleDateString() : "Not set"}</div></article>
        <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Material Shortage</p><div className="mt-2 text-base font-bold text-text">{workOrder.materialRequirements.reduce((sum, requirement) => sum + requirement.shortageQuantity, 0)}</div></article>
      </section>
      <div className="grid gap-3 xl:grid-cols-[minmax(0,1fr)_minmax(360px,0.9fr)]">
        <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Execution Context</p>
          <dl className="mt-5 grid gap-3">
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Build item</dt><dd className="mt-1 text-sm text-text">{workOrder.itemSku} - {workOrder.itemName}</dd></div>
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Item type</dt><dd className="mt-1 text-sm text-text">{workOrder.itemType}</dd></div>
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Output location</dt><dd className="mt-1 text-sm text-text">{workOrder.warehouseCode} / {workOrder.locationCode}</dd></div>
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Project customer</dt><dd className="mt-1 text-sm text-text">{workOrder.projectCustomerName || "Not linked"}</dd></div>
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Demand source</dt><dd className="mt-1 text-sm text-text">{workOrder.salesOrderNumber ?? "Not linked"}</dd></div>
          </dl>
        </article>
        <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Work Instructions</p>
          <p className="mt-3 whitespace-pre-line text-sm leading-6 text-text">{workOrder.notes || "No work-order notes recorded."}</p>
        </article>
      </div>
      <section className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Operation Plan</p>
        {workOrder.operations.length === 0 ? (
          <div className="mt-6 rounded-3xl border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">This work order has no inherited station operations. Add routing steps on the item record to automate planning.</div>
        ) : (
          <div className="mt-5 overflow-hidden rounded-3xl border border-line/70">
            <table className="min-w-full divide-y divide-line/70 text-sm">
              <thead className="bg-page/70">
                <tr className="text-left text-xs font-semibold uppercase tracking-[0.18em] text-muted">
                  <th className="px-3 py-3">Seq</th>
                  <th className="px-3 py-3">Station</th>
                  <th className="px-3 py-3">Start</th>
                  <th className="px-3 py-3">End</th>
                  <th className="px-3 py-3">Minutes</th>
                </tr>
              </thead>
              <tbody className="divide-y divide-line/70">
                {workOrder.operations.map((operation) => (
                  <tr key={operation.id} className="bg-surface/70">
                    <td className="px-3 py-3 text-text">{operation.sequence}</td>
                    <td className="px-3 py-3">
                      <div className="font-semibold text-text">{operation.stationCode}</div>
                      <div className="mt-1 text-xs text-muted">{operation.stationName}</div>
                    </td>
                    <td className="px-3 py-3 text-text">{new Date(operation.plannedStart).toLocaleString()}</td>
                    <td className="px-3 py-3 text-text">{new Date(operation.plannedEnd).toLocaleString()}</td>
                    <td className="px-3 py-3 text-text">{operation.plannedMinutes}</td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
      </section>
      {canManage ? (
        <section className="grid gap-3 xl:grid-cols-2">
          <form onSubmit={handleIssueSubmit} className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Material Issue</p>
            <div className="mt-4 grid gap-3">
              <label className="block">
                <span className="mb-2 block text-sm font-semibold text-text">Component</span>
                <select value={issueForm.componentItemId} onChange={(event) => setIssueForm((current) => ({ ...current, componentItemId: event.target.value }))} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand">
                  <option value="">Select component</option>
                  {workOrder.materialRequirements.map((requirement) => (
                    <option key={requirement.componentItemId} value={requirement.componentItemId}>{requirement.componentSku} - {requirement.componentName}</option>
                  ))}
                </select>
              </label>
              <div className="grid gap-3 sm:grid-cols-3">
                <label className="block">
                  <span className="mb-2 block text-sm font-semibold text-text">Warehouse</span>
                  <select value={issueForm.warehouseId} onChange={(event) => setIssueForm((current) => ({ ...current, warehouseId: event.target.value, locationId: "" }))} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand">
                    {[...new Map(locationOptions.map((option) => [option.warehouseId, option])).values()].map((option) => (
                      <option key={option.warehouseId} value={option.warehouseId}>{option.warehouseCode} - {option.warehouseName}</option>
                    ))}
                  </select>
                </label>
                <label className="block">
                  <span className="mb-2 block text-sm font-semibold text-text">Location</span>
                  <select value={issueForm.locationId} onChange={(event) => setIssueForm((current) => ({ ...current, locationId: event.target.value }))} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand">
                    <option value="">Select location</option>
                    {filteredLocationOptions.map((option) => (
                      <option key={option.locationId} value={option.locationId}>{option.locationCode} - {option.locationName}</option>
                    ))}
                  </select>
                </label>
                <label className="block">
                  <span className="mb-2 block text-sm font-semibold text-text">Quantity</span>
                  <input type="number" min={1} step={1} value={issueForm.quantity} onChange={(event) => setIssueForm((current) => ({ ...current, quantity: Number.parseInt(event.target.value, 10) || 1 }))} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
                </label>
              </div>
              <label className="block">
                <span className="mb-2 block text-sm font-semibold text-text">Notes</span>
                <textarea value={issueForm.notes} onChange={(event) => setIssueForm((current) => ({ ...current, notes: event.target.value }))} rows={3} className="w-full rounded-3xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
              </label>
              <button type="submit" disabled={isPostingIssue} className="rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white disabled:cursor-not-allowed disabled:opacity-60">
                {isPostingIssue ? "Posting issue..." : "Post material issue"}
              </button>
            </div>
          </form>
          <form onSubmit={handleCompletionSubmit} className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Production Completion</p>
            <div className="mt-4 grid gap-3">
              <label className="block">
                <span className="mb-2 block text-sm font-semibold text-text">Quantity</span>
                <input type="number" min={1} step={1} value={completionForm.quantity} onChange={(event) => setCompletionForm((current) => ({ ...current, quantity: Number.parseInt(event.target.value, 10) || 1 }))} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
              </label>
              <label className="block">
                <span className="mb-2 block text-sm font-semibold text-text">Notes</span>
                <textarea value={completionForm.notes} onChange={(event) => setCompletionForm((current) => ({ ...current, notes: event.target.value }))} rows={3} className="w-full rounded-3xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
              </label>
              <div className="rounded-2xl border border-line/70 bg-page/70 px-2 py-2 text-sm text-muted">Finished goods receipt posts back to {workOrder.warehouseCode} / {workOrder.locationCode}.</div>
              <button type="submit" disabled={isPostingCompletion} className="rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white disabled:cursor-not-allowed disabled:opacity-60">
                {isPostingCompletion ? "Posting completion..." : "Post completion"}
              </button>
            </div>
          </form>
        </section>
      ) : null}
      <section className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Material Requirements</p>
        {workOrder.materialRequirements.length === 0 ? (
          <div className="mt-6 rounded-3xl border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">This build item does not currently have BOM material requirements.</div>
        ) : (
          <div className="mt-5 overflow-hidden rounded-3xl border border-line/70">
            <table className="min-w-full divide-y divide-line/70 text-sm">
              <thead className="bg-page/70">
                <tr className="text-left text-xs font-semibold uppercase tracking-[0.18em] text-muted">
                  <th className="px-3 py-3">Component</th>
                  <th className="px-3 py-3">Per</th>
                  <th className="px-3 py-3">Required</th>
                  <th className="px-3 py-3">Issued</th>
                  <th className="px-3 py-3">Remaining</th>
                  <th className="px-3 py-3">Available</th>
                  <th className="px-3 py-3">Shortage</th>
                </tr>
              </thead>
              <tbody className="divide-y divide-line/70">
                {workOrder.materialRequirements.map((requirement) => (
                  <tr key={requirement.componentItemId} className="bg-surface/70">
                    <td className="px-3 py-3"><div className="font-semibold text-text">{requirement.componentSku}</div><div className="mt-1 text-xs text-muted">{requirement.componentName}</div></td>
                    <td className="px-3 py-3 text-text">{requirement.quantityPer} {requirement.unitOfMeasure}</td>
                    <td className="px-3 py-3 text-text">{requirement.requiredQuantity}</td>
                    <td className="px-3 py-3 text-text">{requirement.issuedQuantity}</td>
                    <td className="px-3 py-3 text-text">{requirement.remainingQuantity}</td>
                    <td className="px-3 py-3 text-text">{requirement.availableQuantity}</td>
                    <td className="px-3 py-3 text-text">{requirement.shortageQuantity}</td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
      </section>
      <section className="grid gap-3 xl:grid-cols-2">
        <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Issue History</p>
          {workOrder.materialIssues.length === 0 ? (
            <div className="mt-6 rounded-3xl border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">No material issues have been posted yet.</div>
          ) : (
            <div className="mt-5 space-y-3">
              {workOrder.materialIssues.map((issue) => (
                <div key={issue.id} className="rounded-3xl border border-line/70 bg-page/60 px-3 py-3">
                  <div className="flex flex-wrap items-center justify-between gap-3">
                    <div>
                      <div className="font-semibold text-text">{issue.componentSku} - {issue.componentName}</div>
                      <div className="mt-1 text-xs text-muted">{issue.warehouseCode} / {issue.locationCode} · {issue.createdByName}</div>
                    </div>
                    <div className="text-sm font-semibold text-text">{issue.quantity}</div>
                  </div>
                  <div className="mt-2 text-xs text-muted">{new Date(issue.createdAt).toLocaleString()}</div>
                  <div className="mt-2 text-sm text-text">{issue.notes || "No notes recorded."}</div>
                </div>
              ))}
            </div>
          )}
        </article>
        <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Completion History</p>
          {workOrder.completions.length === 0 ? (
            <div className="mt-6 rounded-3xl border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">No production completions have been posted yet.</div>
          ) : (
            <div className="mt-5 space-y-3">
              {workOrder.completions.map((completion) => (
                <div key={completion.id} className="rounded-3xl border border-line/70 bg-page/60 px-3 py-3">
                  <div className="flex flex-wrap items-center justify-between gap-3">
                    <div className="font-semibold text-text">{completion.quantity} completed</div>
                    <div className="text-xs text-muted">{completion.createdByName}</div>
                  </div>
                  <div className="mt-2 text-xs text-muted">{new Date(completion.createdAt).toLocaleString()}</div>
                  <div className="mt-2 text-sm text-text">{completion.notes || "No notes recorded."}</div>
                </div>
              ))}
            </div>
          )}
        </article>
      </section>
      <FileAttachmentsPanel
        ownerType="WORK_ORDER"
        ownerId={workOrder.id}
        eyebrow="Manufacturing Documents"
        title="Work-order files"
        description="Store travelers, build instructions, inspection records, and support documents directly on the work order."
        emptyMessage="No manufacturing attachments have been uploaded for this work order yet."
      />
      <div className="rounded-2xl border border-line/70 bg-page/60 px-2 py-2 text-sm text-muted">{status}</div>
    </section>
  );
}
