import { permissions } from "@mrp/shared";
import type { ProjectDetailDto } from "@mrp/shared/dist/projects/types.js";
import type { SalesOrderPlanningDto } from "@mrp/shared/dist/sales/types.js";
import type { SalesDocumentDetailDto } from "@mrp/shared/dist/sales/types.js";
import type { ShipmentDetailDto } from "@mrp/shared/dist/shipping/types.js";
import type { WorkOrderSummaryDto } from "@mrp/shared";
import { useEffect, 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 { projectMilestoneStatusPalette } from "./config";
import { ProjectPriorityBadge } from "./ProjectPriorityBadge";
import { ProjectStatusBadge } from "./ProjectStatusBadge";

export function ProjectDetailPage() {
  const { token, user } = useAuth();
  const { projectId } = useParams();
  const [project, setProject] = useState<ProjectDetailDto | null>(null);
  const [workOrders, setWorkOrders] = useState<WorkOrderSummaryDto[]>([]);
  const [planning, setPlanning] = useState<SalesOrderPlanningDto | null>(null);
  const [quote, setQuote] = useState<SalesDocumentDetailDto | null>(null);
  const [salesOrder, setSalesOrder] = useState<SalesDocumentDetailDto | null>(null);
  const [shipment, setShipment] = useState<ShipmentDetailDto | null>(null);
  const [status, setStatus] = useState("Loading project...");

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

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

    api.getProject(token, projectId)
      .then(async (nextProject) => {
        setProject(nextProject);
        setStatus("Project loaded.");
        const [nextPlanning, nextWorkOrders, nextQuote, nextSalesOrder, nextShipment] = await Promise.all([
          nextProject.salesOrderId ? api.getSalesOrderPlanning(token, nextProject.salesOrderId).catch(() => null) : Promise.resolve(null),
          api.getWorkOrders(token, { projectId: nextProject.id }),
          nextProject.salesQuoteId ? api.getQuote(token, nextProject.salesQuoteId).catch(() => null) : Promise.resolve(null),
          nextProject.salesOrderId ? api.getSalesOrder(token, nextProject.salesOrderId).catch(() => null) : Promise.resolve(null),
          nextProject.shipmentId ? api.getShipment(token, nextProject.shipmentId).catch(() => null) : Promise.resolve(null),
        ]);

        setPlanning(nextPlanning);
        setWorkOrders(nextWorkOrders);
        setQuote(nextQuote);
        setSalesOrder(nextSalesOrder);
        setShipment(nextShipment);
      })
      .catch((error: unknown) => {
        const message = error instanceof ApiError ? error.message : "Unable to load project.";
        setStatus(message);
      });
  }, [projectId, token]);

  if (!project) {
    return <div className="rounded-[20px] border border-line/70 bg-surface/90 p-4 text-sm text-muted shadow-panel">{status}</div>;
  }

  const sortedMilestones = [...project.milestones].sort((left, right) => {
    if (left.status === "COMPLETE" && right.status !== "COMPLETE") {
      return 1;
    }
    if (left.status !== "COMPLETE" && right.status === "COMPLETE") {
      return -1;
    }

    if (left.dueDate && right.dueDate) {
      return new Date(left.dueDate).getTime() - new Date(right.dueDate).getTime();
    }
    if (left.dueDate) {
      return -1;
    }
    if (right.dueDate) {
      return 1;
    }

    return left.sortOrder - right.sortOrder;
  });
  const nextMilestone = sortedMilestones.find((milestone) => milestone.status !== "COMPLETE") ?? null;
  const activeWorkOrders = workOrders.filter((workOrder) => workOrder.status === "RELEASED" || workOrder.status === "IN_PROGRESS" || workOrder.status === "ON_HOLD");
  const nextWorkOrder = [...activeWorkOrders]
    .sort((left, right) => {
      if (left.dueDate && right.dueDate) {
        return new Date(left.dueDate).getTime() - new Date(right.dueDate).getTime();
      }
      if (left.dueDate) {
        return -1;
      }
      if (right.dueDate) {
        return 1;
      }
      return left.workOrderNumber.localeCompare(right.workOrderNumber);
    })[0] ?? null;
  const materialExceptionItems = planning
    ? planning.items.filter((item) => item.uncoveredQuantity > 0 || item.recommendedBuildQuantity > 0 || item.recommendedPurchaseQuantity > 0).slice(0, 5)
    : [];
  const completionPercent = project.rollups.milestoneCount > 0
    ? Math.round((project.rollups.completedMilestoneCount / project.rollups.milestoneCount) * 100)
    : 0;

  return (
    <section className="space-y-4">
      <div className="rounded-[20px] 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">Project</p>
            <h3 className="mt-2 text-xl font-bold text-text">{project.projectNumber}</h3>
            <p className="mt-1 text-sm text-text">{project.name}</p>
            <div className="mt-3 flex flex-wrap gap-2">
              <ProjectStatusBadge status={project.status} />
              <ProjectPriorityBadge priority={project.priority} />
            </div>
          </div>
          <div className="flex flex-wrap gap-3">
            <Link to="/projects" 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 projects</Link>
            {canManage ? <Link to={`/projects/${project.id}/edit`} className="inline-flex items-center justify-center rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white">Edit project</Link> : null}
          </div>
        </div>
      </div>
      <section className="grid gap-3 xl:grid-cols-4">
        <article className="rounded-[18px] 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">Customer</p><div className="mt-2 text-base font-bold text-text">{project.customerName}</div></article>
        <article className="rounded-[18px] 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">Owner</p><div className="mt-2 text-base font-bold text-text">{project.ownerName || "Unassigned"}</div></article>
        <article className="rounded-[18px] 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">{project.dueDate ? new Date(project.dueDate).toLocaleDateString() : "Not set"}</div></article>
        <article className="rounded-[18px] 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">Created</p><div className="mt-2 text-base font-bold text-text">{new Date(project.createdAt).toLocaleDateString()}</div></article>
      </section>
      <section className="grid gap-3 xl:grid-cols-4">
        <article className="rounded-[18px] 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">Milestones</p>
          <div className="mt-2 text-base font-bold text-text">{project.rollups.completedMilestoneCount}/{project.rollups.milestoneCount}</div>
          <div className="mt-1 text-xs text-muted">{project.rollups.openMilestoneCount} open</div>
        </article>
        <article className="rounded-[18px] 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">Overdue Milestones</p>
          <div className="mt-2 text-base font-bold text-text">{project.rollups.overdueMilestoneCount}</div>
        </article>
        <article className="rounded-[18px] 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">Linked Work Orders</p>
          <div className="mt-2 text-base font-bold text-text">{project.rollups.workOrderCount}</div>
          <div className="mt-1 text-xs text-muted">{project.rollups.activeWorkOrderCount} active</div>
        </article>
        <article className="rounded-[18px] 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">Overdue Work Orders</p>
          <div className="mt-2 text-base font-bold text-text">{project.rollups.overdueWorkOrderCount}</div>
          <div className="mt-1 text-xs text-muted">{project.rollups.completedWorkOrderCount} complete</div>
        </article>
      </section>
      <section className="rounded-[20px] 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">Project Cockpit</p>
            <h4 className="mt-2 text-lg font-bold text-text">Cross-functional execution view</h4>
            <p className="mt-2 text-sm text-muted">Commercial, supply, execution, and delivery signals for this program in one place.</p>
          </div>
          <div className="rounded-2xl border border-line/70 bg-page/60 px-3 py-2 text-right">
            <div className="text-xs font-semibold uppercase tracking-[0.16em] text-muted">Milestone Progress</div>
            <div className="mt-1 text-2xl font-bold text-text">{completionPercent}%</div>
          </div>
        </div>
        <div className="mt-5 grid gap-3 xl:grid-cols-4">
          <article className="rounded-[18px] border border-line/70 bg-page/60 p-3">
            <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Commercial</p>
            <div className="mt-2 text-base font-bold text-text">
              {salesOrder ? `$${salesOrder.total.toFixed(2)}` : quote ? `$${quote.total.toFixed(2)}` : "Not linked"}
            </div>
            <div className="mt-1 text-xs text-muted">
              {salesOrder ? `${salesOrder.documentNumber} · ${salesOrder.status}` : quote ? `${quote.documentNumber} · ${quote.status}` : "Link a quote or sales order"}
            </div>
          </article>
          <article className="rounded-[18px] border border-line/70 bg-page/60 p-3">
            <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Supply</p>
            <div className="mt-2 text-base font-bold text-text">{planning ? planning.summary.uncoveredItemCount : 0} shortage items</div>
            <div className="mt-1 text-xs text-muted">
              {planning ? `Build ${planning.summary.totalBuildQuantity} · Buy ${planning.summary.totalPurchaseQuantity}` : "No sales-order planning linked"}
            </div>
          </article>
          <article className="rounded-[18px] border border-line/70 bg-page/60 p-3">
            <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Execution</p>
            <div className="mt-2 text-base font-bold text-text">{project.rollups.activeWorkOrderCount} active work orders</div>
            <div className="mt-1 text-xs text-muted">
              {nextWorkOrder ? `${nextWorkOrder.workOrderNumber} due ${nextWorkOrder.dueDate ? new Date(nextWorkOrder.dueDate).toLocaleDateString() : "unscheduled"}` : "No active work order due date"}
            </div>
          </article>
          <article className="rounded-[18px] border border-line/70 bg-page/60 p-3">
            <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Delivery</p>
            <div className="mt-2 text-base font-bold text-text">{shipment ? shipment.status.replace("_", " ") : "Not linked"}</div>
            <div className="mt-1 text-xs text-muted">
              {shipment ? `${shipment.shipmentNumber} · ${shipment.packageCount} package(s)` : "Link a shipment to track delivery"}
            </div>
          </article>
        </div>
        <div className="mt-5 grid gap-3 xl:grid-cols-[minmax(0,1fr)_minmax(0,1fr)]">
          <article className="rounded-[18px] border border-line/70 bg-page/60 p-3">
            <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Next Checkpoints</p>
            <div className="mt-4 space-y-3">
              <div className="rounded-[16px] border border-line/70 bg-surface/80 p-3">
                <div className="text-xs font-semibold uppercase tracking-[0.16em] text-muted">Milestone</div>
                <div className="mt-2 font-semibold text-text">{nextMilestone ? nextMilestone.title : "All milestones complete"}</div>
                <div className="mt-1 text-xs text-muted">
                  {nextMilestone
                    ? `${nextMilestone.status.replace("_", " ")} · ${nextMilestone.dueDate ? new Date(nextMilestone.dueDate).toLocaleDateString() : "No due date"}`
                    : "No open milestone remains."}
                </div>
              </div>
              <div className="rounded-[16px] border border-line/70 bg-surface/80 p-3">
                <div className="text-xs font-semibold uppercase tracking-[0.16em] text-muted">Work Order</div>
                <div className="mt-2 font-semibold text-text">{nextWorkOrder ? nextWorkOrder.workOrderNumber : "No active work orders"}</div>
                <div className="mt-1 text-xs text-muted">
                  {nextWorkOrder
                    ? `${nextWorkOrder.itemSku} · ${nextWorkOrder.completedQuantity}/${nextWorkOrder.quantity} complete`
                    : "Launch or link a work order to populate execution checkpoints."}
                </div>
              </div>
            </div>
          </article>
          <article className="rounded-[18px] border border-line/70 bg-page/60 p-3">
            <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Material Watchlist</p>
            {materialExceptionItems.length === 0 ? (
              <div className="mt-4 rounded-[16px] border border-dashed border-line/70 bg-surface/80 px-3 py-4 text-sm text-muted">
                No current build/buy exception items from linked sales-order planning.
              </div>
            ) : (
              <div className="mt-4 space-y-3">
                {materialExceptionItems.map((item) => (
                  <div key={item.itemId} className="rounded-[16px] border border-line/70 bg-surface/80 p-3">
                    <div className="flex flex-wrap items-center justify-between gap-3">
                      <div>
                        <div className="font-semibold text-text">{item.itemSku}</div>
                        <div className="mt-1 text-xs text-muted">{item.itemName}</div>
                      </div>
                      <div className="text-xs text-muted">
                        Build {item.recommendedBuildQuantity} · Buy {item.recommendedPurchaseQuantity} · Uncovered {item.uncoveredQuantity}
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            )}
          </article>
        </div>
      </section>
      <div className="grid gap-3 xl:grid-cols-[minmax(0,1.05fr)_minmax(320px,0.95fr)]">
        <article className="rounded-[20px] 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">Customer Linkage</p>
          <dl className="mt-5 grid gap-3">
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Account</dt><dd className="mt-1 text-sm text-text"><Link to={`/crm/customers/${project.customerId}`} className="hover:text-brand">{project.customerName}</Link></dd></div>
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Email</dt><dd className="mt-1 text-sm text-text">{project.customerEmail}</dd></div>
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Phone</dt><dd className="mt-1 text-sm text-text">{project.customerPhone}</dd></div>
          </dl>
        </article>
        <article className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Program Notes</p>
          <p className="mt-3 whitespace-pre-line text-sm leading-6 text-text">{project.notes || "No project notes recorded."}</p>
        </article>
      </div>
      <section className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Commercial + Delivery Links</p>
        <div className="mt-5 grid gap-3 xl:grid-cols-3">
          <div className="rounded-2xl border border-line/70 bg-page/60 px-2 py-2 text-sm">
            <div className="text-xs font-semibold uppercase tracking-[0.16em] text-muted">Quote</div>
            <div className="mt-2 font-semibold text-text">{project.salesQuoteNumber ? <Link to={`/sales/quotes/${project.salesQuoteId}`} className="hover:text-brand">{project.salesQuoteNumber}</Link> : "Not linked"}</div>
          </div>
          <div className="rounded-2xl border border-line/70 bg-page/60 px-2 py-2 text-sm">
            <div className="text-xs font-semibold uppercase tracking-[0.16em] text-muted">Sales Order</div>
            <div className="mt-2 font-semibold text-text">{project.salesOrderNumber ? <Link to={`/sales/orders/${project.salesOrderId}`} className="hover:text-brand">{project.salesOrderNumber}</Link> : "Not linked"}</div>
          </div>
          <div className="rounded-2xl border border-line/70 bg-page/60 px-2 py-2 text-sm">
            <div className="text-xs font-semibold uppercase tracking-[0.16em] text-muted">Shipment</div>
            <div className="mt-2 font-semibold text-text">{project.shipmentNumber ? <Link to={`/shipping/shipments/${project.shipmentId}`} className="hover:text-brand">{project.shipmentNumber}</Link> : "Not linked"}</div>
          </div>
        </div>
      </section>
      <section className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <div className="flex items-center justify-between gap-3">
          <div>
            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Milestones</p>
            <p className="mt-2 text-sm text-muted">Track project checkpoints, blockers, and completion progress.</p>
          </div>
          {canManage ? (
            <Link to={`/projects/${project.id}/edit`} className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text">
              Edit milestones
            </Link>
          ) : null}
        </div>
        {project.milestones.length === 0 ? (
          <div className="mt-6 rounded-[18px] border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
            No milestones are defined for this project yet.
          </div>
        ) : (
          <div className="mt-6 space-y-3">
            {project.milestones.map((milestone) => (
              <div key={milestone.id} className="rounded-[18px] border border-line/70 bg-page/60 p-3">
                <div className="flex flex-wrap items-start justify-between gap-3">
                  <div className="min-w-0">
                    <div className="font-semibold text-text">{milestone.title}</div>
                    <div className="mt-2 flex flex-wrap items-center gap-2">
                      <span className={`inline-flex rounded-full px-2 py-1 text-xs font-semibold uppercase tracking-[0.16em] ${projectMilestoneStatusPalette[milestone.status]}`}>
                        {milestone.status.replace("_", " ")}
                      </span>
                      <span className="text-xs text-muted">
                        Due {milestone.dueDate ? new Date(milestone.dueDate).toLocaleDateString() : "not scheduled"}
                      </span>
                      {milestone.completedAt ? (
                        <span className="text-xs text-muted">Completed {new Date(milestone.completedAt).toLocaleDateString()}</span>
                      ) : null}
                    </div>
                    {milestone.notes ? <div className="mt-3 whitespace-pre-line text-sm text-text">{milestone.notes}</div> : null}
                  </div>
                </div>
              </div>
            ))}
          </div>
        )}
      </section>
      {planning ? (
        <section className="rounded-[20px] 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 Readiness</p>
          <div className="mt-5 grid gap-3 xl:grid-cols-4">
            <article className="rounded-[18px] border border-line/70 bg-page/60 px-3 py-3">
              <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Build Qty</p>
              <div className="mt-2 text-base font-bold text-text">{planning.summary.totalBuildQuantity}</div>
            </article>
            <article className="rounded-[18px] border border-line/70 bg-page/60 px-3 py-3">
              <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Buy Qty</p>
              <div className="mt-2 text-base font-bold text-text">{planning.summary.totalPurchaseQuantity}</div>
            </article>
            <article className="rounded-[18px] border border-line/70 bg-page/60 px-3 py-3">
              <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Uncovered Qty</p>
              <div className="mt-2 text-base font-bold text-text">{planning.summary.totalUncoveredQuantity}</div>
            </article>
            <article className="rounded-[18px] border border-line/70 bg-page/60 px-3 py-3">
              <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Shortage Items</p>
              <div className="mt-2 text-base font-bold text-text">{planning.summary.uncoveredItemCount}</div>
            </article>
          </div>
          <div className="mt-5 space-y-3">
            {planning.items
              .filter((item) => item.recommendedBuildQuantity > 0 || item.recommendedPurchaseQuantity > 0 || item.uncoveredQuantity > 0)
              .slice(0, 8)
              .map((item) => (
                <div key={item.itemId} className="rounded-[18px] border border-line/70 bg-page/60 p-3">
                  <div className="flex flex-wrap items-center justify-between gap-3">
                    <div>
                      <div className="font-semibold text-text">{item.itemSku}</div>
                      <div className="mt-1 text-xs text-muted">{item.itemName}</div>
                    </div>
                    <div className="text-sm text-muted">
                      Build {item.recommendedBuildQuantity} · Buy {item.recommendedPurchaseQuantity} · Uncovered {item.uncoveredQuantity}
                    </div>
                  </div>
                </div>
              ))}
          </div>
        </section>
      ) : null}
      <section className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <div className="flex items-center justify-between gap-3">
          <div>
            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Manufacturing Links</p>
            <p className="mt-2 text-sm text-muted">Work orders already linked to this project.</p>
          </div>
          {canManage ? (
            <Link to={`/manufacturing/work-orders/new?projectId=${project.id}`} className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text">
              New work order
            </Link>
          ) : null}
        </div>
        {workOrders.length === 0 ? (
          <div className="mt-6 rounded-[18px] border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">No work orders are linked to this project yet.</div>
        ) : (
          <div className="mt-6 space-y-3">
            {workOrders.map((workOrder) => (
              <Link key={workOrder.id} to={`/manufacturing/work-orders/${workOrder.id}`} className="block rounded-[18px] border border-line/70 bg-page/60 p-3 transition hover:bg-page/80">
                <div className="flex flex-wrap items-center justify-between gap-3">
                  <div>
                    <div className="font-semibold text-text">{workOrder.workOrderNumber}</div>
                    <div className="mt-1 text-xs text-muted">{workOrder.itemSku} · {workOrder.completedQuantity}/{workOrder.quantity} complete</div>
                  </div>
                  <div className="text-sm font-semibold text-text">{workOrder.status.replace("_", " ")}</div>
                </div>
              </Link>
            ))}
          </div>
        )}
      </section>
      <FileAttachmentsPanel
        ownerType="PROJECT"
        ownerId={project.id}
        eyebrow="Project Documents"
        title="Program file hub"
        description="Store drawings, revision references, correspondence, and support files directly on the project record."
        emptyMessage="No project files have been uploaded yet."
      />
      <div className="rounded-2xl border border-line/70 bg-page/60 px-2 py-2 text-sm text-muted">{status}</div>
    </section>
  );
}