'use client';

import React from 'react';
import styled, { keyframes } from 'styled-components';

export interface PipelineNode {
  id: string;
  label: string;
  role: string;
  state: 'idle' | 'active' | 'review' | 'blocked' | 'ready';
  detail: string;
}

interface ActivePipelineProps {
  activeTask: string;
  focus: string;
  reviewLoopCount: number;
  escalationCount: number;
  deployState: string;
  nodes: PipelineNode[];
}

const flow = keyframes`
  0% { transform: translateX(0); opacity: 0.15; }
  40% { opacity: 0.8; }
  100% { transform: translateX(20px); opacity: 0; }
`;

const PipelineCard = styled.section`
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
`;

const Header = styled.div`
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  align-items: flex-start;
  flex-wrap: wrap;
`;

const Eyebrow = styled.div`
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
`;

const Title = styled.h2`
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-top: 6px;
`;

const Summary = styled.p`
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 780px;
  text-transform: uppercase;
`;

const HeaderStats = styled.div`
  display: grid;
  grid-template-columns: repeat(3, minmax(110px, 1fr));
  gap: var(--space-sm);

  @media (max-width: 767px) {
    width: 100%;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
`;

const StatBox = styled.div`
  border: 1px solid var(--border-color);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
`;

const StatLabel = styled.span`
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
`;

const StatValue = styled.span`
  font-size: 15px;
  color: var(--text-primary);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
`;

const FlowMap = styled.div`
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  align-items: stretch;

  @media (max-width: 1199px) {
    grid-template-columns: 1fr;
  }
`;

const NodeWrap = styled.div`
  display: flex;
  align-items: center;
  gap: 10px;

  @media (max-width: 1199px) {
    flex-direction: column;
    align-items: stretch;
  }
`;

const Connector = styled.div<{ $active?: boolean }>`
  flex: 1;
  min-width: 36px;
  height: 1px;
  background: ${({ $active }) => ($active ? 'rgba(245,245,245,0.45)' : 'var(--border-color)')};
  position: relative;
  overflow: hidden;

  &::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -18px;
    width: 18px;
    height: 5px;
    background: ${({ $active }) => ($active ? 'rgba(245,245,245,0.85)' : 'transparent')};
    animation: ${({ $active }) => ($active ? flow : 'none')} 1.6s linear infinite;
  }

  @media (max-width: 1199px) {
    width: 1px;
    height: 24px;
    min-width: 1px;
    margin: 0 auto;

    &::after {
      top: -8px;
      left: -2px;
      width: 5px;
      height: 10px;
      animation: none;
    }
  }
`;

const stateBorder: Record<PipelineNode['state'], string> = {
  idle: 'var(--border-color)',
  active: '#6fc3ff',
  review: '#ff7ac6',
  blocked: '#ff8d7a',
  ready: '#8dffb2',
};

const stateText: Record<PipelineNode['state'], string> = {
  idle: 'IDLE',
  active: 'ACTIVE',
  review: 'REVIEW',
  blocked: 'BLOCKED',
  ready: 'READY',
};

const NodeCard = styled.div<{ $state: PipelineNode['state'] }>`
  border: 1px solid ${({ $state }) => stateBorder[$state]};
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 148px;
  background: linear-gradient(180deg, rgba(255,255,255,0.015) 0%, rgba(255,255,255,0) 100%);
`;

const NodeTop = styled.div`
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  align-items: flex-start;
`;

const NodeLabel = styled.div`
  display: flex;
  flex-direction: column;
  gap: 4px;
`;

const NodeName = styled.div`
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
`;

const NodeRole = styled.div`
  font-size: 12px;
  color: var(--text-secondary);
`;

const StateBadge = styled.span<{ $state: PipelineNode['state'] }>`
  font-family: var(--font-mono);
  font-size: 10px;
  color: ${({ $state }) => stateBorder[$state]};
  border: 1px solid ${({ $state }) => stateBorder[$state]};
  padding: 4px 6px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
`;

const NodeDetail = styled.div`
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-primary);
`;

const NodeHint = styled.div`
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
`;

export default function ActivePipeline({
  activeTask,
  focus,
  reviewLoopCount,
  escalationCount,
  deployState,
  nodes,
}: ActivePipelineProps) {
  return (
    <PipelineCard>
      <Header>
        <div>
          <Eyebrow>Active pipeline / snapshot</Eyebrow>
          <Title>{activeTask}</Title>
          <Summary>{focus}</Summary>
        </div>
        <HeaderStats>
          <StatBox>
            <StatLabel>review loop</StatLabel>
            <StatValue>{reviewLoopCount}x</StatValue>
          </StatBox>
          <StatBox>
            <StatLabel>escalations</StatLabel>
            <StatValue>{escalationCount}</StatValue>
          </StatBox>
          <StatBox>
            <StatLabel>deploy state</StatLabel>
            <StatValue>{deployState}</StatValue>
          </StatBox>
        </HeaderStats>
      </Header>

      <FlowMap>
        {nodes.map((node, index) => {
          const connectorActive = node.state === 'active' || node.state === 'review' || node.state === 'ready';
          return (
            <NodeWrap key={node.id}>
              <NodeCard $state={node.state}>
                <NodeTop>
                  <NodeLabel>
                    <NodeName>{node.label}</NodeName>
                    <NodeRole>{node.role}</NodeRole>
                  </NodeLabel>
                  <StateBadge $state={node.state}>{stateText[node.state]}</StateBadge>
                </NodeTop>
                <NodeDetail>{node.detail}</NodeDetail>
                <NodeHint>snapshot {String(index + 1).padStart(2, '0')}</NodeHint>
              </NodeCard>
              {index < nodes.length - 1 && <Connector $active={connectorActive} />}
            </NodeWrap>
          );
        })}
      </FlowMap>
    </PipelineCard>
  );
}