"use client";

import { calculateDurationInDays } from "@/app/utils/function/projectDuration";
import {
  Card,
  CardHeader,
  CardTitle,
  CardContent,
  CardDescription,
} from "ikoncomponents";
import { Badge } from "ikoncomponents";
import { Button } from "ikoncomponents";
import { CalendarDays, Clock, Building2, UserRound, ArrowRight, Loader2 } from "lucide-react";
import { useRouter } from "next/navigation";
import { useState } from "react";

export type ProjectCardProps = {
  projectIdentifier: string;
  projectName: string;
  projectDescription: string;
  projectStatus: string;
  projectClient:string;
  productType: string;
  contractedStartDate: string ;
  contractedEndDate: string ;
  projectManager:string;
};

// A small palette of accent themes. Only the icons, left border and the solid
// button are colored — the panels stay neutral so text is always readable.
// Each entry carries explicit light + dark classes and uses 600-weight fills
// with white text so contrast holds in both themes. Classes are static strings
// (not interpolated) so Tailwind keeps them in the build.
const ACCENTS = [
  {
    border: "border-l-blue-500",
    icon: "text-blue-600 dark:text-blue-400",
    button:
      "bg-blue-600 text-white hover:bg-blue-700 dark:bg-blue-600 dark:hover:bg-blue-500",
  },
  {
    border: "border-l-emerald-500",
    icon: "text-emerald-600 dark:text-emerald-400",
    button:
      "bg-emerald-600 text-white hover:bg-emerald-700 dark:bg-emerald-600 dark:hover:bg-emerald-500",
  },
  {
    border: "border-l-violet-500",
    icon: "text-violet-600 dark:text-violet-400",
    button:
      "bg-violet-600 text-white hover:bg-violet-700 dark:bg-violet-600 dark:hover:bg-violet-500",
  },
  {
    border: "border-l-amber-500",
    icon: "text-amber-600 dark:text-amber-400",
    button:
      "bg-amber-600 text-white hover:bg-amber-700 dark:bg-amber-600 dark:hover:bg-amber-500",
  },
  {
    border: "border-l-rose-500",
    icon: "text-rose-600 dark:text-rose-400",
    button:
      "bg-rose-600 text-white hover:bg-rose-700 dark:bg-rose-600 dark:hover:bg-rose-500",
  },
  {
    border: "border-l-cyan-500",
    icon: "text-cyan-600 dark:text-cyan-400",
    button:
      "bg-cyan-600 text-white hover:bg-cyan-700 dark:bg-cyan-600 dark:hover:bg-cyan-500",
  },
] as const;

export default function ProjectCard({
  projectIdentifier,
  projectName,
  projectDescription,
  projectStatus,
  projectClient,
  productType,
  projectManager,
  contractedStartDate,
  contractedEndDate,
}: ProjectCardProps) {

  const router = useRouter();

  // Shows a spinner on the button from the moment it's clicked until this card
  // unmounts (i.e. the project details route has taken over). The details page
  // then renders its own spinner while it finishes loading.
  const [isNavigating, setIsNavigating] = useState(false);

  const duration = calculateDurationInDays(contractedStartDate,contractedEndDate);

  const handleViewDetails = () => {
    setIsNavigating(true);
    router.push(`/main/planning/projects/${projectIdentifier}`);
  };

  // Pick a stable accent per project so the same card is always the same color.
  const accent = (() => {
    const key = projectIdentifier || projectName || "";
    let hash = 0;
    for (let i = 0; i < key.length; i++) {
      hash = (hash * 31 + key.charCodeAt(i)) >>> 0;
    }
    return ACCENTS[hash % ACCENTS.length];
  })();

  // Map a project status to a badge style so the state reads at a glance.
  const statusVariant = (() => {
    switch (projectStatus?.toLowerCase()) {
      case "completed":
        return "verified" as const;
      case "active":
      case "ongoing":
        return "default" as const;
      default:
        return "secondary" as const;
    }
  })();

  return (
    <Card
      className={`group flex flex-col rounded-2xl border border-l-4 ${accent.border} shadow-sm transition-all hover:-translate-y-0.5 hover:shadow-lg`}
    >

      <CardHeader className="flex flex-row items-start justify-between gap-3 pb-3">
        <div className="min-w-0">
          <CardTitle className="truncate text-lg font-semibold leading-tight">
            {projectName}
          </CardTitle>
        </div>

        <Badge variant={statusVariant} className="shrink-0 text-xs px-3 py-1">
          {projectStatus || "Unknown"}
        </Badge>
      </CardHeader>

      <CardContent className="flex flex-1 flex-col space-y-4">

        {/* Description */}
        <CardDescription className="line-clamp-2 min-h-10 text-sm">
          {projectDescription || "No description provided."}
        </CardDescription>

        {/* Meta — neutral panel, colored icons, full-width rows so values stay readable */}
        <div className="space-y-2.5 rounded-xl border bg-muted/40 p-3 text-sm">
          <div className="flex items-center justify-between gap-3">
            <div className="flex min-w-0 items-center gap-2 text-muted-foreground">
              <CalendarDays className={`h-4 w-4 shrink-0 ${accent.icon}`} />
              <span className="truncate text-foreground">
                {contractedStartDate || "to"} – {contractedEndDate || "—"}
              </span>
            </div>
            <div className="flex shrink-0 items-center gap-1.5 text-muted-foreground">
              <Clock className={`h-4 w-4 shrink-0 ${accent.icon}`} />
              <span className="text-foreground">{duration}d</span>
            </div>
          </div>

          <div className="flex items-center gap-2 text-muted-foreground">
            <Building2 className={`h-4 w-4 shrink-0 ${accent.icon}`} />
            <span className="truncate text-foreground">{projectClient || "—"}</span>
          </div>

          <div className="flex items-center gap-2 text-muted-foreground">
            <UserRound className={`h-4 w-4 shrink-0 ${accent.icon}`} />
            <span className="truncate text-foreground">{projectManager || "—"}</span>
          </div>
        </div>

        <Button
          onClick={handleViewDetails}
          disabled={isNavigating}
          className={`mt-auto flex w-full items-center justify-center gap-2 border-0 ${accent.button}`}
        >
          {isNavigating ? (
            <>
              Loading
              <Loader2 className="h-4 w-4 animate-spin" />
            </>
          ) : (
            <>
              View Details
              <ArrowRight className="h-4 w-4 transition-transform group-hover:translate-x-0.5" />
            </>
          )}
        </Button>

      </CardContent>
    </Card>
  );
}