import { useState } from "react";
import { Link } from "react-router-dom";
import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { Folder, Plus, RefreshCw, ChevronLeft } from "lucide-react";
import { createProject, getProjects } from "../lib/api";
import type { CreateProjectPayload, Project } from "../lib/api";
import {
  Card,
  CardSkeleton,
  Chip,
  EmptyState,
  ErrorState,
  Modal,
  PageHeader,
  PanelsMenu,
  btnPrimary,
  btnSecondary,
  inputCls,
} from "../components/ui";
import { useAuthStore } from "../store/auth";
import { Perm, hasPermission } from "../lib/roles";

function ProjectCard({ project }: { project: Project }) {
  const targetId = project.id || project.op_project_id;
  const statusLabels: Record<string, { label: string; tone: "green" | "sky" | "amber" | "slate" }> = {
    PLANNING: { label: "برنامه‌ریزی", tone: "amber" },
    PLANNED: { label: "برنامه‌ریزی", tone: "amber" },
    ACTIVE: { label: "در حال اجرا", tone: "green" },
    ON_HOLD: { label: "متوقف", tone: "amber" },
    COMPLETED: { label: "تکمیل‌شده", tone: "sky" },
    CANCELLED: { label: "لغو شده", tone: "slate" },
    ARCHIVED: { label: "بایگانی", tone: "slate" },
  };

  const currentStatus = project.status ? statusLabels[project.status.toUpperCase()] : null;
  const progressVal =
    project.progress !== undefined
      ? Math.round(project.progress)
      : project.stats.total > 0
      ? Math.round(
          Math.max(
            0,
            ((project.stats.total - project.stats.overdue - project.stats.failed_qc) /
              project.stats.total) *
              100
          )
        )
      : 0;

  return (
    <Link to={`/projects/${targetId}`} className="group block">
      <Card className="p-3 shadow-xs transition-all duration-150 hover:border-slate-300 hover:shadow-sm active:bg-slate-50/90">
        <div className="flex items-center justify-between gap-3">
          {/* بلوک محتوایی ۲ سطره در سمت راست */}
          <div className="min-w-0 flex-1 space-y-2">
            {/* سطر ۱: نام پروژه و بج پیل وضعیت */}
            <div className="flex items-center gap-2 min-w-0">
              <p className="min-w-0 truncate text-xs font-bold text-slate-800 group-hover:text-sky-700 transition-colors">
                {project.name}
              </p>
              {project.stats.failed_qc > 0 ? (
                <span className="inline-flex shrink-0 items-center rounded-full bg-red-50 border border-red-200/60 px-2 py-0.5 text-[10px] font-bold text-red-600">
                  {project.stats.failed_qc} مردود
                </span>
              ) : currentStatus ? (
                <Chip tone={currentStatus.tone} className="text-[10px] py-0 px-2 shrink-0">
                  {currentStatus.label}
                </Chip>
              ) : (
                <span className="inline-flex shrink-0 items-center rounded-full bg-emerald-50 border border-emerald-200/60 px-2 py-0.5 text-[10px] font-medium text-emerald-700">
                  در حال اجرا
                </span>
              )}
            </div>

            {/* سطر ۲: پیل تعداد فعالیت در راست — نوار پیشرفت باریک با درصد در چپ */}
            <div className="flex items-center justify-between gap-3">
              <div className="flex items-center gap-1.5 min-w-0">
                <span className="inline-flex shrink-0 items-center rounded-md bg-slate-100 px-2 py-0.5 text-[10px] font-medium text-slate-600">
                  {project.stats.total} فعالیت
                </span>
                {project.stats.awaiting_qc > 0 && (
                  <span className="inline-flex shrink-0 items-center rounded-md bg-amber-50 px-1.5 py-0.5 text-[10px] font-medium text-amber-700">
                    {project.stats.awaiting_qc} منتظر QC
                  </span>
                )}
                {project.location && (
                  <span className="truncate text-[10px] text-slate-400 hidden sm:inline">
                    • {project.location}
                  </span>
                )}
              </div>

              <div className="flex items-center gap-2 w-28 sm:w-32 shrink-0 justify-end">
                <div dir="rtl" className="h-1.5 flex-1 overflow-hidden rounded-full bg-slate-100">
                  <div
                    className={`h-full rounded-full transition-all duration-300 ${
                      progressVal >= 100 ? "bg-emerald-500" : "bg-sky-500"
                    }`}
                    style={{ width: `${progressVal}%` }}
                  />
                </div>
                <span className="shrink-0 text-left text-[10px] font-bold tabular-nums text-slate-500 w-7">
                  {progressVal}٪
                </span>
              </div>
            </div>
          </div>

          {/* فلش تعاملی در منتهی‌الیه چپ با تراز عمودی کامل روی کل ارتفاع کارت */}
          <div className="flex h-7 w-7 shrink-0 items-center justify-center self-center text-slate-400 transition-all group-hover:text-sky-600 group-hover:bg-sky-50 group-active:-translate-x-0.5 rounded-lg">
            <ChevronLeft size={18} />
          </div>
        </div>
      </Card>
    </Link>
  );
}

function CreateProjectModal({ open, onClose }: { open: boolean; onClose: () => void }) {
  const queryClient = useQueryClient();
  const [name, setName] = useState("");
  const [description, setDescription] = useState("");
  const [location, setLocation] = useState("");
  const [projectManager, setProjectManager] = useState("");
  const [errorMsg, setErrorMsg] = useState("");

  const createMutation = useMutation({
    mutationFn: (payload: CreateProjectPayload) => createProject(payload),
    onSuccess: () => {
      void queryClient.invalidateQueries({ queryKey: ["projects"] });
      onClose();
      setName("");
      setDescription("");
      setLocation("");
      setProjectManager("");
      setErrorMsg("");
    },
    onError: (err: any) => {
      setErrorMsg(err?.message || "خطا در ثبت پروژه");
    },
  });

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    if (!name.trim()) {
      setErrorMsg("نام پروژه الزامی است");
      return;
    }
    setErrorMsg("");
    createMutation.mutate({
      name: name.trim(),
      description: description.trim(),
      location: location.trim(),
      project_manager: projectManager.trim(),
    });
  };

  return (
    <Modal open={open} title="تعریف پروژه جدید" onClose={onClose}>
      <form onSubmit={handleSubmit} className="space-y-3">
        {errorMsg && (
          <div className="rounded-xl bg-red-50 p-2.5 text-xs text-red-600">
            {errorMsg}
          </div>
        )}

        <div>
          <label className="mb-1 block text-xs font-semibold text-slate-600">نام پروژه *</label>
          <input
            value={name}
            onChange={(e) => setName(e.target.value)}
            placeholder="مثال: برج مسکونی آسمان"
            required
            className={inputCls}
          />
        </div>

        <div className="grid grid-cols-1 sm:grid-cols-2 gap-2">
          <div>
            <label className="mb-1 block text-xs font-semibold text-slate-600">محل پروژه</label>
            <input
              value={location}
              onChange={(e) => setLocation(e.target.value)}
              placeholder="موقعیت جغرافیایی / شهر"
              className={inputCls}
            />
          </div>
          <div>
            <label className="mb-1 block text-xs font-semibold text-slate-600">مدیر / سرپرست پروژه</label>
            <input
              value={projectManager}
              onChange={(e) => setProjectManager(e.target.value)}
              placeholder="نام سرپرست"
              className={inputCls}
            />
          </div>
        </div>

<div>
          <label className="mb-1 block text-xs font-semibold text-slate-600">توضیحات</label>
          <textarea
            value={description}
            onChange={(e) => setDescription(e.target.value)}
            rows={2}
            placeholder="توضیحات تکمیلی پروژه..."
            className="w-full rounded-xl border border-slate-300 p-2.5 text-sm text-slate-800 focus:border-sky-500 focus:outline-none focus:ring-2 focus:ring-sky-100"
          />
        </div>

        <div className="flex items-center justify-end gap-2 pt-2">
          <button type="button" onClick={onClose} className={btnSecondary}>
            انصراف
          </button>
          <button type="submit" disabled={createMutation.isPending} className={btnPrimary}>
            {createMutation.isPending ? "در حال ثبت..." : "ایجاد پروژه"}
          </button>
        </div>
      </form>
    </Modal>
  );
}

export default function ProjectsPage() {
  const queryClient = useQueryClient();
  const user = useAuthStore((s) => s.user);
  const isSupervisor = (user?.role as string) === "project_supervisor" || (user?.role as string) === "supervisor";
  const canCreate = !isSupervisor && hasPermission(user, Perm.projectsCreate);
  const [showCreateModal, setShowCreateModal] = useState(false);

  const projectsQuery = useQuery({ queryKey: ["projects"], queryFn: getProjects });

  const refresh = () => {
    void queryClient.invalidateQueries({ queryKey: ["projects"] });
  };

  return (
    <>
      <PageHeader
        title="پروژه‌ها"
        menu={<PanelsMenu />}
        right={
          <div className="flex items-center gap-1">
            {canCreate && (
              <button
                type="button"
                onClick={() => setShowCreateModal(true)}
                className="inline-flex h-9 items-center gap-1.5 rounded-lg bg-sky-600 px-3 text-xs font-semibold text-white transition-colors active:bg-sky-700"
              >
                <Plus size={16} />
                <span>پروژه جدید</span>
              </button>
            )}
            <button
              type="button"
              onClick={refresh}
              aria-label="به‌روزرسانی"
              className="flex h-11 w-11 items-center justify-center rounded-full text-slate-500 active:bg-slate-100"
            >
              <RefreshCw size={20} className={projectsQuery.isFetching ? "animate-spin" : ""} />
            </button>
          </div>
        }
      />

      <div className="px-4 pb-28 pt-4">
        {projectsQuery.isPending ? (
          <div className="space-y-3">
            <CardSkeleton />
            <CardSkeleton />
            <CardSkeleton />
          </div>
        ) : projectsQuery.isError ? (
          <ErrorState onRetry={refresh} />
        ) : (
          <>
            {(projectsQuery.data ?? []).length === 0 ? (
              <Card>
                <EmptyState
                  icon={Folder}
                  title={canCreate ? "پروژه‌ای ثبت نشده است" : "پروژه‌ای به شما اختصاص داده نشده است"}
                  description={
                    canCreate
                      ? "برای شروع کار، روی دکمه «پروژه جدید» در بالا بزنید."
                      : "در حال حاضر هیچ پروژه‌ای به شما تخصیص نیافته است. مدیر پروژه باید از بخش کاربران دسترسی شما را تعریف کند."
                  }
                />
              </Card>
            ) : (
              <div className="space-y-3">
                {(projectsQuery.data ?? []).map((p) => (
                  <ProjectCard key={p.id || p.op_project_id} project={p} />
                ))}
              </div>
            )}
          </>
        )}
      </div>

      <CreateProjectModal open={showCreateModal} onClose={() => setShowCreateModal(false)} />
    </>
  );
}