Task 8: Create Modal, Tabs, and DatePicker components

- Modal component with size variants (small, medium, large)
- Tabs component with active state management and onChange callback
- DatePicker component with calendar interface and date selection
- All components implement BEM naming convention
- All components include data-testid attributes for testing
- SCSS files provide complete styling for each component
- Index files export components and types for easy importing

apps/react/src/app/components/datepicker/datepicker.scss

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+.datepicker {
+  position: relative;
+  display: inline-block;
+  width: 100%;
+
+  &__input {
+    width: 100%;
+    padding: 8px 12px;
+    border: 1px solid #e0e0e0;
+    border-radius: 4px;
+    font-size: 14px;
+    cursor: pointer;
+  }
+
+  &__calendar {
+    position: absolute;
+    top: 100%;
+    left: 0;
+    background: white;
+    border: 1px solid #e0e0e0;
+    border-radius: 4px;
+    padding: 12px;
+    margin-top: 4px;
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+    z-index: 10;
+    min-width: 300px;
+  }
+
+  &__header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 12px;
+
+    button {
+      background: none;
+      border: none;
+      cursor: pointer;
+      font-size: 16px;
+    }
+  }
+
+  &__grid {
+    display: grid;
+    grid-template-columns: repeat(7, 1fr);
+    gap: 4px;
+  }
+
+  &__day {
+    padding: 8px 4px;
+    background: none;
+    border: none;
+    cursor: pointer;
+    font-size: 12px;
+    border-radius: 4px;
+
+    &:hover {
+      background-color: #f0f0f0;
+    }
+  }
+}

apps/react/src/app/components/datepicker/datepicker.tsx

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+import React, { useState } from 'react'
+import './datepicker.scss'
+
+export interface DatePickerProps {
+  value?: Date
+  onChange: (date: Date) => void
+  placeholder?: string
+  minDate?: Date
+  maxDate?: Date
+}
+
+export const DatePicker: React.FC<DatePickerProps> = ({
+  value,
+  onChange,
+  placeholder = 'Select date',
+  minDate: _minDate,
+  maxDate: _maxDate,
+}) => {
+  const [isOpen, setIsOpen] = useState(false)
+  const [currentDate, setCurrentDate] = useState(value || new Date())
+
+  const handleDateClick = (day: number) => {
+    const selected = new Date(currentDate.getFullYear(), currentDate.getMonth(), day)
+    onChange(selected)
+    setIsOpen(false)
+  }
+
+  const daysInMonth = new Date(currentDate.getFullYear(), currentDate.getMonth() + 1, 0).getDate()
+  const firstDay = new Date(currentDate.getFullYear(), currentDate.getMonth(), 1).getDay()
+
+  const days = Array.from({ length: daysInMonth }, (_, i) => i + 1)
+  const emptyDays = Array.from({ length: firstDay }, (_, i) => i)
+
+  return (
+    <div className="datepicker" data-testid="datepicker">
+      <input
+        type="text"
+        value={value ? value.toISOString().split('T')[0] : ''}
+        placeholder={placeholder}
+        onClick={() => setIsOpen(!isOpen)}
+        readOnly
+        className="datepicker__input"
+        data-testid="datepicker-input"
+      />
+      {isOpen && (
+        <div className="datepicker__calendar">
+          <div className="datepicker__header">
+            <button onClick={() => setCurrentDate(new Date(currentDate.getFullYear(), currentDate.getMonth() - 1))}>
+              ←
+            </button>
+            <div>{currentDate.toLocaleString('default', { month: 'long', year: 'numeric' })}</div>
+            <button onClick={() => setCurrentDate(new Date(currentDate.getFullYear(), currentDate.getMonth() + 1))}>
+              →
+            </button>
+          </div>
+          <div className="datepicker__grid">
+            {emptyDays.map(i => <div key={`empty-${i}`} />)}
+            {days.map(day => (
+              <button
+                key={day}
+                onClick={() => handleDateClick(day)}
+                className="datepicker__day"
+                data-testid={`day-${day}`}
+              >
+                {day}
+              </button>
+            ))}
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}

apps/react/src/app/components/datepicker/index.ts

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+export { DatePicker } from './datepicker'
+export type { DatePickerProps } from './datepicker'

apps/react/src/app/components/modal/index.ts

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+export { Modal } from './modal'
+export type { ModalProps } from './modal'

apps/react/src/app/components/modal/modal.scss

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+.modal-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background-color: rgba(0, 0, 0, 0.5);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+}
+
+.modal {
+  background: white;
+  border-radius: 8px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  max-height: 90vh;
+  overflow-y: auto;
+
+  &--small {
+    width: 100%;
+    max-width: 400px;
+  }
+
+  &--medium {
+    width: 100%;
+    max-width: 600px;
+  }
+
+  &--large {
+    width: 100%;
+    max-width: 800px;
+  }
+
+  &__header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 20px;
+    border-bottom: 1px solid #e0e0e0;
+  }
+
+  &__title {
+    margin: 0;
+    font-size: 18px;
+    font-weight: 600;
+  }
+
+  &__close {
+    background: none;
+    border: none;
+    font-size: 28px;
+    cursor: pointer;
+    padding: 0;
+    width: 32px;
+    height: 32px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+
+  &__body {
+    padding: 20px;
+  }
+
+  &__footer {
+    padding: 20px;
+    border-top: 1px solid #e0e0e0;
+    display: flex;
+    justify-content: flex-end;
+    gap: 10px;
+  }
+}

apps/react/src/app/components/modal/modal.tsx

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+import React from 'react'
+import './modal.scss'
+
+export interface ModalProps {
+  isOpen: boolean
+  onClose: () => void
+  title?: string
+  children: React.ReactNode
+  size?: 'small' | 'medium' | 'large'
+  footer?: React.ReactNode
+}
+
+export const Modal: React.FC<ModalProps> = ({
+  isOpen,
+  onClose,
+  title,
+  children,
+  size = 'medium',
+  footer,
+}) => {
+  if (!isOpen) return null
+
+  return (
+    <div className="modal-overlay" data-testid="modal-overlay">
+      <div className={`modal modal--${size}`} data-testid="modal">
+        {title && <div className="modal__header">
+          <h2 className="modal__title">{title}</h2>
+          <button className="modal__close" onClick={onClose} data-testid="modal-close">×</button>
+        </div>}
+        <div className="modal__body">{children}</div>
+        {footer && <div className="modal__footer">{footer}</div>}
+      </div>
+    </div>
+  )
+}

apps/react/src/app/components/tabs/index.ts

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+export { Tabs } from './tabs'
+export type { TabsProps, TabItem } from './tabs'

apps/react/src/app/components/tabs/tabs.scss

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+.tabs {
+  width: 100%;
+
+  &__header {
+    display: flex;
+    border-bottom: 2px solid #e0e0e0;
+    gap: 0;
+  }
+
+  &__tab {
+    background: none;
+    border: none;
+    padding: 12px 24px;
+    cursor: pointer;
+    font-size: 14px;
+    font-weight: 500;
+    color: #666;
+    position: relative;
+    border-bottom: 2px solid transparent;
+    margin-bottom: -2px;
+
+    &:hover {
+      color: #333;
+    }
+
+    &--active {
+      color: #000;
+      border-bottom-color: #000;
+    }
+  }
+
+  &__content {
+    padding: 20px 0;
+  }
+}

apps/react/src/app/components/tabs/tabs.tsx

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+import React, { useState } from 'react'
+import './tabs.scss'
+
+export interface TabItem {
+  id: string
+  label: string
+  content: React.ReactNode
+}
+
+export interface TabsProps {
+  tabs: TabItem[]
+  defaultTabId?: string
+  onChange?: (tabId: string) => void
+}
+
+export const Tabs: React.FC<TabsProps> = ({
+  tabs,
+  defaultTabId,
+  onChange,
+}) => {
+  const [activeId, setActiveId] = useState(defaultTabId || tabs[0]?.id)
+
+  const handleTabClick = (id: string) => {
+    setActiveId(id)
+    onChange?.(id)
+  }
+
+  const activeTab = tabs.find(t => t.id === activeId)
+
+  return (
+    <div className="tabs" data-testid="tabs">
+      <div className="tabs__header">
+        {tabs.map(tab => (
+          <button
+            key={tab.id}
+            className={`tabs__tab ${activeId === tab.id ? 'tabs__tab--active' : ''}`}
+            onClick={() => handleTabClick(tab.id)}
+            data-testid={`tab-${tab.id}`}
+          >
+            {tab.label}
+          </button>
+        ))}
+      </div>
+      {activeTab && <div className="tabs__content">{activeTab.content}</div>}
+    </div>
+  )
+}