"use client";

import { useEffect, useRef } from "react";
import SafeImage from "./SafeImage";

interface Experience {
  name: string;
  company: string;
  position: string;
  description: string;
  startDate: string;
  endDate: string;
  logo?: string;
}

interface ExperienceProps {
  experiences: Experience[];
}

function formatDate(d: string) {
  if (d === "current") return "Present";
  const [, m, y] = d.split("-");
  const months = ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"];
  return `${months[parseInt(m) - 1]} ${y}`;
}

function ExperienceItem({ exp, index }: { exp: Experience; index: number }) {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current;
    if (!el) return;
    const obs = new IntersectionObserver(
      ([entry]) => {
        if (entry.isIntersecting) {
          setTimeout(() => el.classList.add("visible"), index * 100);
          obs.disconnect();
        }
      },
      { threshold: 0.1 }
    );
    obs.observe(el);
    return () => obs.disconnect();
  }, [index]);

  const isCurrent = exp.endDate === "current";

  return (
    <div
      ref={ref}
      className="reveal"
      style={{
        display: "grid",
        gridTemplateColumns: "120px 1px 1fr",
        gap: "0 2rem",
        paddingBottom: "3rem",
      }}
    >
      {/* Date */}
      <div style={{ textAlign: "right", paddingTop: "2px" }}>
        <div
          className="font-mono"
          style={{
            fontFamily: "var(--font-jetbrains), monospace",
            fontSize: "0.62rem",
            letterSpacing: "0.08em",
            color: isCurrent ? "#c8a96e" : "#4a5060",
            lineHeight: 1.6,
          }}
        >
          {isCurrent && (
            <div style={{ color: "#c8a96e", marginBottom: "0.25rem", letterSpacing: "0.14em" }}>
              ● NOW
            </div>
          )}
          {formatDate(exp.startDate)}
          <br />—<br />
          {formatDate(exp.endDate)}
        </div>
      </div>

      {/* Line with dot */}
      <div style={{ position: "relative", display: "flex", justifyContent: "center" }}>
        <div style={{ width: "1px", background: "#1c1f26", height: "100%" }} />
        <div
          style={{
            position: "absolute",
            top: "4px",
            width: "8px",
            height: "8px",
            borderRadius: "50%",
            background: isCurrent ? "#c8a96e" : "#1c1f26",
            border: isCurrent ? "none" : "1px solid #4a5060",
            left: "50%",
            transform: "translateX(-50%)",
          }}
        />
      </div>

      {/* Content */}
      <div>
        <div style={{ display: "flex", alignItems: "center", gap: "0.75rem", marginBottom: "0.5rem" }}>
          {exp.logo && (
            <SafeImage
              src={exp.logo}
              alt={exp.company}
              width={28}
              height={28}
              fallbackLabel={exp.company.slice(0, 2).toUpperCase()}
              style={{ width: "24px", height: "24px", objectFit: "contain", filter: "brightness(0.7) grayscale(0.4)" }}
            />
          )}
          <span
            className="section-label"
            style={{ fontSize: "0.58rem" }}
          >
            {exp.company}
          </span>
        </div>

        <h3
          className="font-display"
          style={{
            fontFamily: "var(--font-bebas), sans-serif",
            fontSize: "1.5rem",
            letterSpacing: "0.04em",
            color: "#e2e4e9",
            marginBottom: "0.5rem",
          }}
        >
          {exp.position}
        </h3>
        <p
          style={{
            fontFamily: "var(--font-lora), serif",
            fontSize: "0.9rem",
            lineHeight: 1.7,
            color: "#6b7280",
          }}
        >
          {exp.description}
        </p>
      </div>
    </div>
  );
}

export default function Experience({ experiences }: ExperienceProps) {
  const headingRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = headingRef.current;
    if (!el) return;
    const obs = new IntersectionObserver(
      ([entry]) => {
        if (entry.isIntersecting) { el.classList.add("visible"); obs.disconnect(); }
      },
      { threshold: 0.1 }
    );
    obs.observe(el);
    return () => obs.disconnect();
  }, []);

  return (
    <section
      id="experience"
      style={{ padding: "8rem 2rem", background: "#0a0b0e" }}
    >
      <div style={{ maxWidth: "1200px", margin: "0 auto" }}>
        <div ref={headingRef} className="reveal" style={{ marginBottom: "4rem" }}>
          <div className="section-label" style={{ marginBottom: "0.75rem" }}>Career Path</div>
          <h2
            className="font-display"
            style={{
              fontFamily: "var(--font-bebas), sans-serif",
              fontSize: "clamp(2.5rem, 6vw, 5rem)",
              letterSpacing: "0.04em",
              color: "#e2e4e9",
              lineHeight: 1,
            }}
          >
            Experience
          </h2>
          <div style={{ width: "48px", height: "1px", background: "#c8a96e", marginTop: "1rem" }} />
        </div>

        <div>
          {experiences.map((exp, i) => (
            <ExperienceItem key={exp.name} exp={exp} index={i} />
          ))}
        </div>
      </div>
    </section>
  );
}