import React, { useCallback, useEffect, useRef, useState } from 'react';

import { getTeamColorSet } from '@renderer/constants/teamColors';
import { useStore } from '@renderer/store';
import { FileText, Search, Terminal } from 'lucide-react';

import type { ToolApprovalRequest } from '@shared/types';

// ---------------------------------------------------------------------------
// Tool icon mapping
// ---------------------------------------------------------------------------

function getToolIcon(toolName: string): React.ReactNode {
  const cls = 'size-4 shrink-0';
  switch (toolName) {
    case 'Bash':
      return <Terminal className={cls} />;
    case 'Read':
    case 'Edit':
    case 'Write':
    case 'NotebookEdit':
      return <FileText className={cls} />;
    case 'Grep':
    case 'Glob':
      return <Search className={cls} />;
    default:
      return <Terminal className={cls} />;
  }
}

// ---------------------------------------------------------------------------
// Smart input preview
// ---------------------------------------------------------------------------

function renderToolInput(toolName: string, input: Record<string, unknown>): string {
  switch (toolName) {
    case 'Bash':
      return typeof input.command === 'string' ? input.command : JSON.stringify(input, null, 2);
    case 'Edit':
    case 'Read':
    case 'Write':
    case 'NotebookEdit':
      return typeof input.file_path === 'string' ? input.file_path : JSON.stringify(input, null, 2);
    case 'Grep':
    case 'Glob':
      return typeof input.pattern === 'string' ? input.pattern : JSON.stringify(input, null, 2);
    default:
      return JSON.stringify(input, null, 2);
  }
}

// ---------------------------------------------------------------------------
// Elapsed timer hook
// ---------------------------------------------------------------------------

function useElapsed(receivedAt: string): number {
  const [elapsed, setElapsed] = useState(() =>
    Math.max(0, Math.floor((Date.now() - new Date(receivedAt).getTime()) / 1000))
  );

  useEffect(() => {
    setElapsed(Math.max(0, Math.floor((Date.now() - new Date(receivedAt).getTime()) / 1000)));
    const id = setInterval(() => {
      setElapsed(Math.max(0, Math.floor((Date.now() - new Date(receivedAt).getTime()) / 1000)));
    }, 1000);
    return () => clearInterval(id);
  }, [receivedAt]);

  return elapsed;
}

// ---------------------------------------------------------------------------
// Main component
// ---------------------------------------------------------------------------

export const ToolApprovalSheet: React.FC = () => {
  const pendingApprovals = useStore((s) => s.pendingApprovals);
  const respondToToolApproval = useStore((s) => s.respondToToolApproval);
  const teams = useStore((s) => s.teams);

  const current: ToolApprovalRequest | undefined = pendingApprovals[0];
  const containerRef = useRef<HTMLDivElement>(null);
  const [disabled, setDisabled] = useState(false);

  // Auto-focus when new approval arrives
  useEffect(() => {
    if (current && containerRef.current) {
      containerRef.current.focus();
    }
  }, [current?.requestId]); // eslint-disable-line react-hooks/exhaustive-deps

  const handleRespond = useCallback(
    (allow: boolean) => {
      if (!current || disabled) return;
      setDisabled(true);
      void respondToToolApproval(current.teamName, current.runId, current.requestId, allow).finally(
        () => {
          setTimeout(() => setDisabled(false), 200);
        }
      );
    },
    [current, disabled, respondToToolApproval]
  );

  const handleKeyDown = useCallback(
    (e: React.KeyboardEvent) => {
      if (e.key === 'Enter') {
        e.preventDefault();
        handleRespond(true);
      } else if (e.key === 'Escape') {
        e.preventDefault();
        handleRespond(false);
      }
    },
    [handleRespond]
  );

  if (!current) return null;

  const teamSummary = teams.find((t) => t.teamName === current.teamName);
  const teamColor = teamSummary?.color ? getTeamColorSet(teamSummary.color) : null;

  return (
    <div
      ref={containerRef}
      tabIndex={0}
      onKeyDown={handleKeyDown}
      className="fixed bottom-4 left-1/2 z-[55] w-full max-w-[480px] -translate-x-1/2 rounded-lg border shadow-xl outline-none duration-200 animate-in fade-in slide-in-from-bottom-4"
      style={{
        backgroundColor: 'var(--color-surface-overlay)',
        borderColor: 'var(--color-border-emphasis)',
      }}
    >
      {/* Header */}
      <div
        className="flex items-center justify-between border-b px-4 py-2.5"
        style={{ borderColor: 'var(--color-border)' }}
      >
        <div className="flex items-center gap-2">
          {getToolIcon(current.toolName)}
          <span className="text-sm font-semibold" style={{ color: 'var(--color-text)' }}>
            {current.toolName}
          </span>
        </div>
        <div className="flex items-center gap-2.5">
          {teamColor ? (
            <span
              className="rounded-full px-2 py-0.5 text-[10px] font-medium"
              style={{
                backgroundColor: teamColor.badge,
                color: teamColor.text,
                border: `1px solid ${teamColor.border}`,
              }}
            >
              {teamSummary?.displayName ?? current.teamName}
            </span>
          ) : (
            <span className="text-[10px] text-[var(--color-text-muted)]">{current.teamName}</span>
          )}
          <ElapsedDisplay receivedAt={current.receivedAt} />
        </div>
      </div>

      {/* Tool input preview */}
      <div className="px-4 py-2.5">
        <pre
          className="custom-scrollbar max-h-[120px] overflow-auto whitespace-pre-wrap break-all rounded-md border p-2 font-mono text-xs"
          style={{
            backgroundColor: 'var(--color-surface)',
            borderColor: 'var(--color-border)',
            color: 'var(--color-text-secondary)',
          }}
        >
          {renderToolInput(current.toolName, current.toolInput)}
        </pre>
      </div>

      {/* Actions */}
      <div
        className="flex items-center justify-between border-t px-4 py-2.5"
        style={{ borderColor: 'var(--color-border)' }}
      >
        <div className="flex items-center gap-2">
          <button
            type="button"
            disabled={disabled}
            onClick={() => handleRespond(true)}
            className="rounded-md px-3.5 py-1.5 text-xs font-medium text-white transition-colors disabled:opacity-50"
            style={{ backgroundColor: 'rgb(5, 150, 105)' }}
            onMouseEnter={(e) => {
              if (!disabled) e.currentTarget.style.backgroundColor = 'rgb(16, 185, 129)';
            }}
            onMouseLeave={(e) => {
              e.currentTarget.style.backgroundColor = 'rgb(5, 150, 105)';
            }}
          >
            Allow
          </button>
          <button
            type="button"
            disabled={disabled}
            onClick={() => handleRespond(false)}
            className="rounded-md border px-3.5 py-1.5 text-xs font-medium transition-colors disabled:opacity-50"
            style={{
              borderColor: 'rgba(239, 68, 68, 0.5)',
              color: 'rgb(248, 113, 113)',
            }}
            onMouseEnter={(e) => {
              if (!disabled) e.currentTarget.style.backgroundColor = 'rgba(239, 68, 68, 0.1)';
            }}
            onMouseLeave={(e) => {
              e.currentTarget.style.backgroundColor = 'transparent';
            }}
          >
            Deny
          </button>
        </div>
        {pendingApprovals.length > 1 && (
          <span className="text-[11px] text-[var(--color-text-muted)]">
            {pendingApprovals.length - 1} pending
          </span>
        )}
      </div>
    </div>
  );
};

// ---------------------------------------------------------------------------
// Elapsed display sub-component (uses hook)
// ---------------------------------------------------------------------------

function ElapsedDisplay({ receivedAt }: { receivedAt: string }): React.JSX.Element {
  const elapsed = useElapsed(receivedAt);
  return (
    <span className="text-[11px] tabular-nums text-[var(--color-text-muted)]">{elapsed}s</span>
  );
}