"use client";

import { AnimatePresence, motion } from "motion/react";
import { DownloadSimple, Play, Prohibit, Warning } from "@phosphor-icons/react";

import { Panel } from "@/components/ui";
import { downloadName } from "@/lib/download";
import { explainJobError } from "@/lib/errors";
import { progressPercent } from "@/lib/progress";
import { STAGE_LABEL, type Job } from "@/lib/types";

export function Queue({
  jobs,
  selectedId,
  onSelect,
  onCancel,
}: {
  jobs: Job[];
  selectedId: string | null;
  onSelect: (job: Job) => void;
  onCancel: (job: Job) => void;
}) {
  const running = jobs.filter((job) => !TERMINAL.has(job.stage)).length;

  return (
    <Panel
      title="Takes"
      hint={running > 0 ? `${running} on the desk` : undefined}
      className="overflow-hidden"
    >
      {jobs.length === 0 ? (
        <div className="rounded-console border border-dashed border-line-strong px-5 py-8 text-center">
          <p className="text-[13px] text-ink">Nothing rendered yet</p>
          <p className="mx-auto mt-1 max-w-[34ch] text-[12px] leading-snug text-ink-faint">
            Write a style and some lyrics, then hit render. Every take stays here with its seed and
            its score so you can go back to it.
          </p>
        </div>
      ) : (
        <ul className="flex flex-col gap-1.5">
          <AnimatePresence initial={false}>
            {jobs.map((job) => (
              <motion.li
                key={job.id}
                layout
                initial={{ opacity: 0, y: -6 }}
                animate={{ opacity: 1, y: 0 }}
                exit={{ opacity: 0 }}
                transition={{ duration: 0.18 }}
              >
                <Row
                  job={job}
                  selected={job.id === selectedId}
                  onSelect={() => onSelect(job)}
                  onCancel={() => onCancel(job)}
                />
              </motion.li>
            ))}
          </AnimatePresence>
        </ul>
      )}
    </Panel>
  );
}

const TERMINAL = new Set(["done", "failed", "cancelled"]);

function Row({
  job,
  selected,
  onSelect,
  onCancel,
}: {
  job: Job;
  selected: boolean;
  onSelect: () => void;
  onCancel: () => void;
}) {
  const active = !TERMINAL.has(job.stage);
  const failed = job.stage === "failed";
  const percent = progressPercent(job);
  // Keep the raw text on the title attribute: the plain version is for acting
  // on, the original is for diagnosing.
  const explained = failed ? explainJobError(job.error) : null;

  return (
    <div
      className={`group relative overflow-hidden rounded-console border transition-colors duration-150 ${
        selected ? "border-citron/50 bg-citron/5" : "border-line bg-raised hover:border-line-strong"
      }`}
    >
      <button
        type="button"
        onClick={onSelect}
        disabled={job.stage !== "done"}
        className="flex w-full items-center gap-3 px-3 py-2.5 text-left disabled:cursor-default"
      >
        <span
          className={`flex h-7 w-7 shrink-0 items-center justify-center rounded-console ${
            failed ? "bg-alarm/15 text-alarm" : selected ? "bg-citron text-void" : "bg-void text-ink-faint"
          }`}
        >
          {failed ? <Warning size={13} weight="fill" /> : <Play size={12} weight="fill" />}
        </span>

        <span className="min-w-0 flex-1">
          <span className="block truncate text-[13px] text-ink">{job.title}</span>
          <span
            className={`block truncate text-[11.5px] ${failed ? "text-alarm" : "text-ink-faint"}`}
            title={failed ? (job.error ?? undefined) : undefined}
          >
            {failed ? (explained ?? job.error) : STAGE_LABEL[job.stage]}
            {active && percent !== null ? ` · ${percent}%` : ""}
            {active && percent === null && job.queuePosition
              ? ` · ${job.queuePosition} ahead`
              : ""}
          </span>
        </span>

        <span className="shrink-0 font-mono text-[11px] text-ink-faint">
          {job.seedUsed.toString(36).slice(0, 6)}
        </span>
      </button>

      <div className="absolute top-2 right-2 flex gap-1 opacity-0 transition-opacity group-hover:opacity-100 group-focus-within:opacity-100">
        {job.stage === "done" && job.audio ? (
          <a
            href={job.audio.url}
            download={downloadName(job)}
            onClick={(event) => event.stopPropagation()}
            className="flex h-6 w-6 items-center justify-center rounded-console bg-void text-ink-dim transition-colors hover:text-citron"
            aria-label="Download this take"
          >
            <DownloadSimple size={12} weight="bold" />
          </a>
        ) : null}
        {active ? (
          <button
            type="button"
            onClick={onCancel}
            className="flex h-6 w-6 items-center justify-center rounded-console bg-void text-ink-dim transition-colors hover:text-alarm"
            aria-label="Stop this take"
          >
            <Prohibit size={12} weight="bold" />
          </button>
        ) : null}
      </div>

      {active ? (
        percent === null ? (
          // No step reporting, so show motion rather than a number we guessed.
          <div className="h-[2px] overflow-hidden bg-line">
            <div className="h-full w-1/3 animate-pulse bg-citron" />
          </div>
        ) : (
          <div
            className="h-[2px] bg-citron transition-[width] duration-300 ease-out"
            style={{ width: `${Math.max(3, percent)}%` }}
          />
        )
      ) : null}
    </div>
  );
}