// app/tasks/TaskDetail.tsx
// Expanded panel for a single task. Shows log, result, error. Has
// retry, cancel, and delete buttons.

"use client";

import { useState } from "react";
import { TASK_TYPE_META, STATUS_LABEL, PRIORITY_LABEL } from "./columns";
import { type Task, retryTask, cancelTask, deleteTask } from "./api";

interface TaskDetailProps {
  task: Task;
  onClose: () => void;
  onMutated: () => void;
  onToast: (kind: "info" | "success" | "error" | "warn", title: string, body?: string) => void;
}

export default function TaskDetail({ task, onClose, onMutated, onToast }: TaskDetailProps) {
  const [busy, setBusy] = useState<string | null>(null);
  const meta = TASK_TYPE_META[task.task_type];

  async function act(label: string, fn: () => Promise<any>) {
    setBusy(label);
    try {
      await fn();
      onMutated();
      onToast("success", `${label} done`);
    } catch (err: any) {
      onToast("error", `${label} failed`, err.message);
    } finally {
      setBusy(null);
    }
  }

  return (
    <div
      className="fixed inset-0 z-40 bg-black/40 flex items-start justify-center pt-12 px-4 overflow-y-auto"
      onClick={onClose}
      role="dialog"
      aria-modal="true"
    >
      <div
        className="bg-surface rounded-lg border border-border shadow-xl w-full max-w-2xl"
        onClick={(e) => e.stopPropagation()}
      >
        <div className="p-5 space-y-4">
          <div className="flex items-start justify-between gap-3">
            <div className="flex-1 min-w-0">
              <div className="flex flex-wrap items-center gap-2 mb-2">
                <span className={`text-[10px] font-semibold uppercase tracking-wider px-1.5 py-0.5 rounded border ${meta.tone}`}>
                  {meta.icon} {meta.label}
                </span>
                <span className="text-[10px] font-semibold uppercase tracking-wider px-1.5 py-0.5 rounded border bg-blue-50 text-blue-700 border-blue-200">
                  {STATUS_LABEL[task.status]}
                </span>
                <span className="text-[10px] font-semibold uppercase tracking-wider px-1.5 py-0.5 rounded border bg-amber-50 text-amber-800 border-amber-200">
                  {PRIORITY_LABEL[task.priority]}
                </span>
                {task.retry_count > 0 ? (
                  <span className="text-[10px] font-semibold uppercase tracking-wider px-1.5 py-0.5 rounded border bg-orange-50 text-orange-800 border-orange-300">
                    retry ×{task.retry_count}
                  </span>
                ) : null}
              </div>
              <h2 className="text-xl font-bold text-fg leading-tight">{task.title}</h2>
              {task.description ? (
                <p className="text-sm text-muted mt-2 whitespace-pre-wrap">{task.description}</p>
              ) : null}
            </div>
            <button
              type="button"
              onClick={onClose}
              className="text-muted hover:text-fg text-sm"
              aria-label="Close"
            >
              ✕
            </button>
          </div>

          <div className="grid grid-cols-2 gap-3 text-xs">
            <Meta label="Assignee" value={task.assignee ?? "—"} />
            <Meta label="Claimed by" value={task.claimed_by ?? "—"} />
            <Meta label="Created" value={formatTime(task.created)} />
            <Meta label="Claimed at" value={formatTime(task.claimed_at)} />
            <Meta label="Started" value={formatTime(task.started_at)} />
            <Meta label="Completed" value={formatTime(task.completed_at)} />
            <Meta label="Duration" value={task.duration_ms != null ? `${(task.duration_ms / 1000).toFixed(2)}s` : "—"} />
            <Meta label="Created by" value={task.created_by ?? "—"} />
          </div>

          {task.payload && Object.keys(task.payload as object).length > 0 ? (
            <Section title="Payload">
              <pre className="text-xs font-mono bg-bg p-3 rounded border border-border overflow-x-auto">
                {JSON.stringify(task.payload, null, 2)}
              </pre>
            </Section>
          ) : null}

          {task.error ? (
            <Section title="Error">
              <p className="text-xs text-red-700 bg-red-50 border border-red-300 p-3 rounded">
                {task.error}
              </p>
            </Section>
          ) : null}

          {task.log && task.log.length > 0 ? (
            <Section title={`Log (${task.log.length} entries)`}>
              <pre className="text-[11px] font-mono bg-bg p-3 rounded border border-border overflow-x-auto whitespace-pre-wrap max-h-60 overflow-y-auto">
                {task.log.join("\n")}
              </pre>
            </Section>
          ) : null}

          {task.result ? (
            <Section title="Result">
              <pre className="text-xs font-mono bg-bg p-3 rounded border border-border overflow-x-auto max-h-60 overflow-y-auto">
                {JSON.stringify(task.result, null, 2)}
              </pre>
            </Section>
          ) : null}

          <div className="flex flex-wrap gap-2 pt-2 border-t border-border">
            {(task.status === "failed" || task.status === "done") && (
              <button
                onClick={() => act("Retry", () => retryTask(task.id))}
                disabled={busy !== null}
                className="px-3 py-1.5 rounded-md bg-blue-600 text-white text-xs font-semibold hover:bg-blue-700 disabled:opacity-50"
              >
                {busy === "Retry" ? "Retrying…" : "↻ Retry"}
              </button>
            )}
            {task.status === "in_progress" && (
              <button
                onClick={() => act("Cancel", () => cancelTask(task.id))}
                disabled={busy !== null}
                className="px-3 py-1.5 rounded-md bg-amber-500 text-white text-xs font-semibold hover:bg-amber-600 disabled:opacity-50"
              >
                {busy === "Cancel" ? "Cancelling…" : "✕ Cancel"}
              </button>
            )}
            <button
              onClick={() => {
                if (confirm(`Delete "${task.title}"? This cannot be undone.`)) {
                  act("Delete", () => deleteTask(task.id).then(onClose));
                }
              }}
              disabled={busy !== null}
              className="px-3 py-1.5 rounded-md border border-red-300 text-red-700 text-xs font-semibold hover:bg-red-50 disabled:opacity-50"
            >
              {busy === "Delete" ? "Deleting…" : "🗑 Delete"}
            </button>
          </div>
        </div>
      </div>
    </div>
  );
}

function Meta({ label, value }: { label: string; value: string }) {
  return (
    <div>
      <p className="text-[10px] font-semibold text-muted uppercase tracking-wider mb-0.5">{label}</p>
      <p className="text-fg">{value}</p>
    </div>
  );
}

function Section({ title, children }: { title: string; children: React.ReactNode }) {
  return (
    <div>
      <h3 className="text-xs font-semibold text-muted uppercase tracking-wider mb-1.5">{title}</h3>
      {children}
    </div>
  );
}

function formatTime(iso: string | null): string {
  if (!iso) return "—";
  const t = new Date(iso.includes("T") ? iso : iso.replace(" ", "T") + "Z");
  if (isNaN(t.getTime())) return "—";
  return t.toLocaleString();
}