// View/Schema Designer page (US-033)
// Visual schema designer for creating custom views

import { useState, useEffect, useCallback, useMemo } from 'react'
import { useParams, useNavigate } from 'react-router-dom'
import apiClient from '@/api/client'
import { useWorkspace } from '@/contexts/WorkspaceContext'
import Button from '@/components/Button'
import Input from '@/components/Input'
import GroupMultiSelect from '@/components/GroupMultiSelect'

// Field type definitions matching backend
const FIELD_TYPES = [
  { value: 'text', label: 'Text', icon: 'T' },
  { value: 'number', label: 'Number', icon: '#' },
  { value: 'email', label: 'Email', icon: '@' },
  { value: 'url', label: 'URL', icon: '🔗' },
  { value: 'date', label: 'Date', icon: '📅' },
  { value: 'datetime', label: 'Date & Time', icon: '🕐' },
  { value: 'boolean', label: 'Boolean', icon: '✓' },
  { value: 'select', label: 'Select', icon: '▼' },
  { value: 'reference', label: 'Reference', icon: '→' },
] as const

const WIDGET_TYPES = [
  { value: '', label: 'Auto' },
  { value: 'textarea', label: 'Text Area' },
  { value: 'select', label: 'Dropdown' },
  { value: 'radio', label: 'Radio Buttons' },
  { value: 'checkbox', label: 'Checkbox' },
  { value: 'color', label: 'Color Picker' },
] as const

interface SchemaField {
  _id: string // Client-side ID for React keys
  name: string
  type: string
  label: string
  description: string
  required: boolean
  display_order: number
  widget: string
  group: string
  default_value?: unknown
  options?: string[]
  reference_collection?: string
}

interface ViewSchema {
  title?: string
  description?: string
  layout?: unknown
  fields?: Omit<SchemaField, '_id'>[] // Full view detail has fields
  field_count?: number // List view has field_count
}

interface View {
  id: string
  name: string
  collection_name: string
  workspace_id: string
  schema: ViewSchema
  settings?: Record<string, unknown>
  created_at: string
  updated_at: string
}

interface Collection {
  name: string
  schema?: Record<string, unknown>
  is_system: boolean
}

// Field editor component
function FieldEditor({
  field,
  onUpdate,
  onDelete,
  onMoveUp,
  onMoveDown,
  isFirst,
  isLast,
  collections,
}: {
  field: SchemaField
  onUpdate: (field: SchemaField) => void
  onDelete: () => void
  onMoveUp: () => void
  onMoveDown: () => void
  isFirst: boolean
  isLast: boolean
  collections: Collection[]
}) {
  const [isExpanded, setIsExpanded] = useState(false)
  const [optionsInput, setOptionsInput] = useState(field.options?.join('\n') || '')

  const handleOptionsChange = (value: string) => {
    setOptionsInput(value)
    const options = value.split('\n').filter(Boolean)
    onUpdate({ ...field, options: options.length > 0 ? options : undefined })
  }

  return (
    <div className="rounded-lg border border-gray-200 bg-white">
      {/* Field header */}
      <div className="flex items-center gap-2 border-b border-gray-100 p-3">
        {/* Drag handle placeholder */}
        <div className="cursor-move text-gray-400">
          <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 8h16M4 16h16" />
          </svg>
        </div>

        {/* Move buttons */}
        <div className="flex flex-col gap-0.5">
          <button
            onClick={onMoveUp}
            disabled={isFirst}
            className="rounded p-0.5 text-gray-400 hover:bg-gray-100 hover:text-gray-600 disabled:opacity-30"
            title="Move up"
            type="button"
          >
            <svg className="h-3 w-3" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 15l7-7 7 7" />
            </svg>
          </button>
          <button
            onClick={onMoveDown}
            disabled={isLast}
            className="rounded p-0.5 text-gray-400 hover:bg-gray-100 hover:text-gray-600 disabled:opacity-30"
            title="Move down"
            type="button"
          >
            <svg className="h-3 w-3" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
            </svg>
          </button>
        </div>

        {/* Type badge */}
        <span className="flex h-6 w-6 items-center justify-center rounded bg-gray-100 text-xs font-medium text-gray-600">
          {FIELD_TYPES.find((t) => t.value === field.type)?.icon || '?'}
        </span>

        {/* Field name and label */}
        <div className="flex-1">
          <span className="font-mono text-sm font-medium text-gray-900">{field.name}</span>
          {field.label && field.label !== field.name && (
            <span className="ml-2 text-sm text-gray-500">({field.label})</span>
          )}
        </div>

        {/* Required badge */}
        {field.required && (
          <span className="rounded bg-red-100 px-1.5 py-0.5 text-xs font-medium text-red-700">
            Required
          </span>
        )}

        {/* Type selector */}
        <select
          value={field.type}
          onChange={(e) => onUpdate({ ...field, type: e.target.value })}
          className="rounded border border-gray-200 px-2 py-1 text-sm"
        >
          {FIELD_TYPES.map((type) => (
            <option key={type.value} value={type.value}>
              {type.label}
            </option>
          ))}
        </select>

        {/* Expand/collapse */}
        <button
          onClick={() => setIsExpanded(!isExpanded)}
          className="rounded p-1 text-gray-400 hover:bg-gray-100 hover:text-gray-600"
          type="button"
        >
          <svg
            className={`h-5 w-5 transition ${isExpanded ? 'rotate-180' : ''}`}
            fill="none"
            viewBox="0 0 24 24"
            stroke="currentColor"
          >
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
          </svg>
        </button>

        {/* Delete button */}
        <button
          onClick={onDelete}
          className="rounded p-1 text-gray-400 hover:bg-red-50 hover:text-red-600"
          title="Delete field"
          type="button"
        >
          <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
            <path
              strokeLinecap="round"
              strokeLinejoin="round"
              strokeWidth={2}
              d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
            />
          </svg>
        </button>
      </div>

      {/* Field properties (expanded) */}
      {isExpanded && (
        <div className="grid gap-4 p-4 sm:grid-cols-2">
          <Input
            label="Display Label"
            value={field.label}
            onChange={(e) => onUpdate({ ...field, label: e.target.value })}
            placeholder={field.name}
          />

          <Input
            label="Description"
            value={field.description}
            onChange={(e) => onUpdate({ ...field, description: e.target.value })}
            placeholder="Help text for this field"
          />

          <div>
            <label className="mb-1.5 block text-sm font-medium text-gray-700">Widget</label>
            <select
              value={field.widget}
              onChange={(e) => onUpdate({ ...field, widget: e.target.value })}
              className="w-full rounded-lg border border-gray-300 px-3 py-2"
            >
              {WIDGET_TYPES.map((w) => (
                <option key={w.value} value={w.value}>
                  {w.label}
                </option>
              ))}
            </select>
          </div>

          <Input
            label="Field Group"
            value={field.group}
            onChange={(e) => onUpdate({ ...field, group: e.target.value })}
            placeholder="e.g., Basic Info, Contact"
          />

          {field.type === 'select' && (
            <div className="sm:col-span-2">
              <label className="mb-1.5 block text-sm font-medium text-gray-700">
                Options (one per line)
              </label>
              <textarea
                value={optionsInput}
                onChange={(e) => handleOptionsChange(e.target.value)}
                placeholder="Option 1&#10;Option 2&#10;Option 3"
                rows={3}
                className="w-full rounded-lg border border-gray-300 px-3 py-2 text-sm"
              />
            </div>
          )}

          {field.type === 'reference' && (
            <div>
              <label className="mb-1.5 block text-sm font-medium text-gray-700">
                Reference Collection
              </label>
              <select
                value={field.reference_collection || ''}
                onChange={(e) => onUpdate({ ...field, reference_collection: e.target.value })}
                className="w-full rounded-lg border border-gray-300 px-3 py-2"
              >
                <option value="">Select collection...</option>
                {collections
                  .filter((c) => !c.is_system)
                  .map((c) => (
                    <option key={c.name} value={c.name}>
                      {c.name}
                    </option>
                  ))}
              </select>
            </div>
          )}

          <div className="flex items-center gap-4 sm:col-span-2">
            <label className="flex items-center gap-2">
              <input
                type="checkbox"
                checked={field.required}
                onChange={(e) => onUpdate({ ...field, required: e.target.checked })}
                className="h-4 w-4 rounded border-gray-300"
              />
              <span className="text-sm text-gray-700">Required field</span>
            </label>
          </div>
        </div>
      )}
    </div>
  )
}

// View form modal
function ViewModal({
  view,
  collections,
  workspaceId,
  onClose,
  onSave,
}: {
  view: View | null
  collections: Collection[]
  workspaceId: string
  onClose: () => void
  onSave: () => void
}) {
  const isEditing = !!view

  const [name, setName] = useState(view?.name || '')
  const [collectionName, setCollectionName] = useState(view?.collection_name || '')
  const [fields, setFields] = useState<SchemaField[]>(() => {
    if (view?.schema?.fields) {
      return view.schema.fields.map((f, index) => ({
        _id: crypto.randomUUID(),
        name: f.name,
        type: f.type || 'text',
        label: f.label || '',
        description: f.description || '',
        required: f.required || false,
        display_order: f.display_order ?? index,
        widget: f.widget || '',
        group: f.group || '',
        default_value: f.default_value,
        options: f.options,
        reference_collection: f.reference_collection,
      }))
    }
    return []
  })
  const [isLoading, setIsLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)

  // Auto-create collection state
  const [autoCreateCollection, setAutoCreateCollection] = useState(false)

  // Access control state
  const [visibleToGroups, setVisibleToGroups] = useState<string[]>(
    (view?.settings?.visible_to_groups as string[]) || []
  )
  const [editableByGroups, setEditableByGroups] = useState<string[]>(
    (view?.settings?.editable_by_groups as string[]) || []
  )

  // Local state for field name editing to avoid re-renders
  const [editingFieldId, setEditingFieldId] = useState<string | null>(null)
  const [editingFieldName, setEditingFieldName] = useState('')

  const sortedFields = useMemo(
    () => [...fields].sort((a, b) => a.display_order - b.display_order),
    [fields]
  )

  const addField = () => {
    const newName = `field_${fields.length + 1}`
    setFields([
      ...fields,
      {
        _id: crypto.randomUUID(),
        name: newName,
        type: 'text',
        label: '',
        description: '',
        required: false,
        display_order: fields.length,
        widget: '',
        group: '',
      },
    ])
  }

  const updateField = (id: string, updated: SchemaField) => {
    setFields(fields.map((f) => (f._id === id ? updated : f)))
  }

  const deleteField = (id: string) => {
    setFields(fields.filter((f) => f._id !== id))
  }

  const moveField = (index: number, direction: 'up' | 'down') => {
    const field = sortedFields[index]
    const swapWith = sortedFields[direction === 'up' ? index - 1 : index + 1]
    if (!swapWith) return

    const fieldOrder = field.display_order
    const swapOrder = swapWith.display_order

    setFields(
      fields.map((f) => {
        if (f._id === field._id) return { ...f, display_order: swapOrder }
        if (f._id === swapWith._id) return { ...f, display_order: fieldOrder }
        return f
      })
    )
  }

  const startEditingFieldName = (field: SchemaField) => {
    setEditingFieldId(field._id)
    setEditingFieldName(field.name)
  }

  const finishEditingFieldName = () => {
    if (editingFieldId && editingFieldName.trim()) {
      const sanitized = editingFieldName.replace(/[^a-zA-Z0-9_]/g, '')
      if (sanitized && !fields.some((f) => f._id !== editingFieldId && f.name === sanitized)) {
        setFields(
          fields.map((f) => (f._id === editingFieldId ? { ...f, name: sanitized } : f))
        )
      }
    }
    setEditingFieldId(null)
    setEditingFieldName('')
  }

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()

    if (!name.trim()) {
      setError('View name is required')
      return
    }

    // Use name as collection name if auto-create is enabled
    let targetCollectionName = collectionName
    if (autoCreateCollection && !isEditing) {
      targetCollectionName = name
    }

    if (!targetCollectionName) {
      setError('Please select a collection')
      return
    }

    setIsLoading(true)
    setError(null)

    try {
      // Auto-create collection if checkbox is checked
      if (autoCreateCollection && !isEditing) {
        try {
          await apiClient.post(`/workspaces/${workspaceId}/collections`, {
            name: name,
            settings: {},
          })
        } catch (err) {
          // Ignore "already exists" error, fail on others
          const message = err instanceof Error ? err.message : ''
          if (!message.includes('already exists')) {
            setError('Failed to create collection: ' + message)
            setIsLoading(false)
            return
          }
        }
      }

      // Build schema in backend format
      const schemaFields = sortedFields.map((f) => {
        const field: Omit<SchemaField, '_id'> = {
          name: f.name,
          type: f.type,
          label: f.label || f.name,
          description: f.description,
          required: f.required,
          display_order: f.display_order,
          widget: f.widget,
          group: f.group,
        }
        if (f.default_value !== undefined) {
          field.default_value = f.default_value
        }
        if (f.options && f.options.length > 0) {
          field.options = f.options
        }
        if (f.reference_collection) {
          field.reference_collection = f.reference_collection
        }
        return field
      })

      const payload = {
        name,
        collection_name: targetCollectionName,
        schema: {
          fields: schemaFields,
        },
        settings: {
          visible_to_groups: visibleToGroups,
          editable_by_groups: editableByGroups,
        },
      }

      if (isEditing && view) {
        await apiClient.request(`/workspaces/${workspaceId}/views/${view.id}`, {
          method: 'PATCH',
          body: payload,
        })
      } else {
        await apiClient.post(`/workspaces/${workspaceId}/views`, payload)
      }

      onSave()
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to save view')
    } finally {
      setIsLoading(false)
    }
  }

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center overflow-y-auto bg-black/50 p-4">
      <div className="max-h-[95vh] w-full max-w-4xl overflow-y-auto rounded-lg bg-white shadow-xl">
        <div className="sticky top-0 z-10 flex items-center justify-between border-b bg-white px-6 py-4">
          <h2 className="text-xl font-semibold text-gray-900">
            {isEditing ? 'Edit View' : 'Create View'}
          </h2>
          <button onClick={onClose} className="rounded p-1 text-gray-400 hover:text-gray-600">
            <svg className="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth={2}
                d="M6 18L18 6M6 6l12 12"
              />
            </svg>
          </button>
        </div>

        <form onSubmit={handleSubmit}>
          <div className="p-6">
            {error && (
              <div className="mb-4 rounded-lg bg-red-50 px-4 py-3 text-sm text-red-700">{error}</div>
            )}

            <div className="grid gap-4 sm:grid-cols-2">
              <Input
                label="View Name"
                value={name}
                onChange={(e) => setName(e.target.value)}
                placeholder="e.g., Customer List"
                required
              />

              <div>
                <label className="mb-1.5 block text-sm font-medium text-gray-700">
                  Collection
                  <span className="ml-1 text-red-500">*</span>
                </label>
                <select
                  value={autoCreateCollection ? name : collectionName}
                  onChange={(e) => setCollectionName(e.target.value)}
                  className="w-full rounded-lg border border-gray-300 px-3 py-2"
                  required={!autoCreateCollection}
                  disabled={isEditing || autoCreateCollection}
                >
                  <option value="">Select a collection...</option>
                  {collections
                    .filter((c) => !c.is_system)
                    .map((c) => (
                      <option key={c.name} value={c.name}>
                        {c.name}
                      </option>
                    ))}
                </select>
                {/* Auto-create collection checkbox */}
                {!isEditing && (
                  <div className="mt-2 flex items-center gap-2">
                    <input
                      type="checkbox"
                      id="auto-create-collection"
                      checked={autoCreateCollection}
                      onChange={(e) => {
                        setAutoCreateCollection(e.target.checked)
                        if (e.target.checked) {
                          setCollectionName(name)
                        }
                      }}
                      className="h-4 w-4 rounded border-gray-300 text-indigo-600 focus:ring-indigo-500"
                    />
                    <label htmlFor="auto-create-collection" className="text-sm text-gray-700">
                      Create new collection with same name
                    </label>
                  </div>
                )}
              </div>
            </div>

            {/* Schema Designer */}
            <div className="mt-6">
              <div className="mb-3 flex items-center justify-between">
                <h3 className="text-lg font-medium text-gray-900">Fields</h3>
                <Button type="button" size="sm" onClick={addField}>
                  <svg className="-ml-1 mr-1 h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
                  </svg>
                  Add Field
                </Button>
              </div>

              {fields.length === 0 ? (
                <div className="rounded-lg border-2 border-dashed border-gray-300 p-8 text-center">
                  <svg
                    className="mx-auto h-12 w-12 text-gray-400"
                    fill="none"
                    viewBox="0 0 24 24"
                    stroke="currentColor"
                  >
                    <path
                      strokeLinecap="round"
                      strokeLinejoin="round"
                      strokeWidth={1}
                      d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"
                    />
                  </svg>
                  <p className="mt-2 text-gray-500">No fields yet. Click "Add Field" to get started.</p>
                </div>
              ) : (
                <div className="space-y-3">
                  {sortedFields.map((field, index) => (
                    <div key={field._id}>
                      <div className="mb-1 flex items-center gap-2">
                        <span className="text-xs text-gray-500">Field name:</span>
                        {editingFieldId === field._id ? (
                          <input
                            type="text"
                            value={editingFieldName}
                            onChange={(e) => setEditingFieldName(e.target.value)}
                            onBlur={finishEditingFieldName}
                            onKeyDown={(e) => {
                              if (e.key === 'Enter') {
                                e.preventDefault()
                                finishEditingFieldName()
                              }
                              if (e.key === 'Escape') {
                                setEditingFieldId(null)
                                setEditingFieldName('')
                              }
                            }}
                            autoFocus
                            className="max-w-[150px] rounded border border-primary-300 px-2 py-0.5 font-mono text-xs focus:outline-none focus:ring-1 focus:ring-primary-500"
                          />
                        ) : (
                          <button
                            type="button"
                            onClick={() => startEditingFieldName(field)}
                            className="max-w-[150px] truncate rounded bg-gray-100 px-2 py-0.5 font-mono text-xs text-gray-700 hover:bg-gray-200"
                          >
                            {field.name}
                          </button>
                        )}
                      </div>
                      <FieldEditor
                        field={field}
                        onUpdate={(updated) => updateField(field._id, updated)}
                        onDelete={() => deleteField(field._id)}
                        onMoveUp={() => moveField(index, 'up')}
                        onMoveDown={() => moveField(index, 'down')}
                        isFirst={index === 0}
                        isLast={index === sortedFields.length - 1}
                        collections={collections}
                      />
                    </div>
                  ))}
                </div>
              )}
            </div>

            {/* Access Control Section */}
            <div className="mt-6 border-t pt-6">
              <h3 className="mb-4 text-lg font-medium text-gray-900">Access Control</h3>

              <div className="space-y-4">
                <div>
                  <label className="mb-2 block text-sm font-medium text-gray-700">
                    Visible To
                  </label>
                  <p className="mb-2 text-xs text-gray-500">
                    Select groups that can see this view. Leave empty for all users.
                  </p>
                  <GroupMultiSelect
                    workspaceId={workspaceId}
                    selectedGroups={visibleToGroups}
                    onChange={setVisibleToGroups}
                  />
                </div>

                <div>
                  <label className="mb-2 block text-sm font-medium text-gray-700">
                    Editable By
                  </label>
                  <p className="mb-2 text-xs text-gray-500">
                    Select groups that can modify this view. Leave empty for workspace admins only.
                  </p>
                  <GroupMultiSelect
                    workspaceId={workspaceId}
                    selectedGroups={editableByGroups}
                    onChange={setEditableByGroups}
                  />
                </div>
              </div>
            </div>
          </div>

          <div className="sticky bottom-0 flex justify-end gap-3 border-t bg-gray-50 px-6 py-4">
            <Button type="button" variant="secondary" onClick={onClose} disabled={isLoading}>
              Cancel
            </Button>
            <Button type="submit" isLoading={isLoading}>
              {isEditing ? 'Save Changes' : 'Create View'}
            </Button>
          </div>
        </form>
      </div>
    </div>
  )
}

// Main Views page component
function Views() {
  const { collectionName } = useParams<{ collectionName?: string }>()
  const navigate = useNavigate()
  const { currentWorkspace } = useWorkspace()

  const [views, setViews] = useState<View[]>([])
  const [collections, setCollections] = useState<Collection[]>([])
  const [isLoading, setIsLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [searchQuery, setSearchQuery] = useState('')

  // Modals
  const [showCreateModal, setShowCreateModal] = useState(false)
  const [editingView, setEditingView] = useState<View | null>(null)
  const [deletingView, setDeletingView] = useState<View | null>(null)
  const [isLoadingViewDetails, setIsLoadingViewDetails] = useState(false)

  // Fetch full view details before editing
  const loadViewForEditing = useCallback(async (viewId: string) => {
    if (!currentWorkspace) return

    setIsLoadingViewDetails(true)
    try {
      const fullView = await apiClient.get<View>(
        `/workspaces/${currentWorkspace.id}/views/${viewId}`
      )
      setEditingView(fullView)
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load view details')
    } finally {
      setIsLoadingViewDetails(false)
    }
  }, [currentWorkspace])

  // Fetch collections for the dropdown
  const fetchCollections = useCallback(async () => {
    if (!currentWorkspace) return

    try {
      const response = await apiClient.get<{ collections: Collection[] }>(
        `/workspaces/${currentWorkspace.id}/collections`
      )
      setCollections(response.collections || [])
    } catch (err) {
      console.error('Failed to fetch collections:', err)
    }
  }, [currentWorkspace])

  // Fetch views
  const fetchViews = useCallback(async () => {
    if (!currentWorkspace) {
      setViews([])
      setIsLoading(false)
      return
    }

    setIsLoading(true)
    setError(null)

    try {
      let url = `/workspaces/${currentWorkspace.id}/views`
      if (collectionName) {
        url += `?collection=${encodeURIComponent(collectionName)}`
      }

      const response = await apiClient.get<{ views: View[] }>(url)
      setViews(response.views || [])
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to fetch views')
    } finally {
      setIsLoading(false)
    }
  }, [currentWorkspace, collectionName])

  useEffect(() => {
    fetchCollections()
  }, [fetchCollections])

  useEffect(() => {
    fetchViews()
  }, [fetchViews])

  const filteredViews = useMemo(() => {
    const query = searchQuery.toLowerCase()
    return views.filter(
      (v) => v.name.toLowerCase().includes(query) || v.collection_name.toLowerCase().includes(query)
    )
  }, [views, searchQuery])

  const handleDelete = async () => {
    if (!deletingView || !currentWorkspace) return

    try {
      await apiClient.delete(`/workspaces/${currentWorkspace.id}/views/${deletingView.id}`)
      setDeletingView(null)
      fetchViews()
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to delete view')
    }
  }

  const handleSave = () => {
    setShowCreateModal(false)
    setEditingView(null)
    fetchViews()
  }

  if (!currentWorkspace) {
    return (
      <div className="space-y-6">
        <div>
          <h1 className="text-2xl font-bold text-gray-900">Views</h1>
          <p className="mt-1 text-gray-600">Design custom views for your collections</p>
        </div>
        <div className="rounded-lg bg-yellow-50 p-6 text-center">
          <p className="text-yellow-800">Please select a workspace first.</p>
        </div>
      </div>
    )
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
        <div>
          <div className="flex items-center gap-2">
            {collectionName && (
              <button onClick={() => navigate('/views')} className="text-gray-400 hover:text-gray-600">
                <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 19l-7-7 7-7" />
                </svg>
              </button>
            )}
            <h1 className="text-2xl font-bold text-gray-900">Views</h1>
          </div>
          <p className="mt-1 text-gray-600">
            {collectionName
              ? `Views for ${collectionName}`
              : `Design custom views in ${currentWorkspace.name}`}
          </p>
        </div>
        <Button onClick={() => setShowCreateModal(true)}>
          <svg className="-ml-1 mr-2 h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
          </svg>
          Create View
        </Button>
      </div>

      {/* Search */}
      <div className="max-w-md">
        <Input
          type="search"
          placeholder="Search views..."
          value={searchQuery}
          onChange={(e) => setSearchQuery(e.target.value)}
        />
      </div>

      {/* Error */}
      {error && <div className="rounded-lg bg-red-50 px-4 py-3 text-sm text-red-700">{error}</div>}

      {/* Loading */}
      {isLoading && (
        <div className="flex items-center justify-center py-12">
          <svg
            className="h-8 w-8 animate-spin text-primary-600"
            xmlns="http://www.w3.org/2000/svg"
            fill="none"
            viewBox="0 0 24 24"
          >
            <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
            <path
              className="opacity-75"
              fill="currentColor"
              d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
            />
          </svg>
        </div>
      )}

      {/* Views grid */}
      {!isLoading && !error && (
        <div>
          {filteredViews.length === 0 ? (
            <div className="rounded-lg border-2 border-dashed border-gray-300 p-12 text-center">
              <svg
                className="mx-auto h-12 w-12 text-gray-400"
                fill="none"
                viewBox="0 0 24 24"
                stroke="currentColor"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={1}
                  d="M4 5a1 1 0 011-1h14a1 1 0 011 1v2a1 1 0 01-1 1H5a1 1 0 01-1-1V5zM4 13a1 1 0 011-1h6a1 1 0 011 1v6a1 1 0 01-1 1H5a1 1 0 01-1-1v-6zM16 13a1 1 0 011-1h2a1 1 0 011 1v6a1 1 0 01-1 1h-2a1 1 0 01-1-1v-6z"
                />
              </svg>
              <p className="mt-4 text-gray-500">{searchQuery ? 'No views match your search' : 'No views yet'}</p>
              {!searchQuery && (
                <Button className="mt-4" onClick={() => setShowCreateModal(true)}>
                  Create Your First View
                </Button>
              )}
            </div>
          ) : (
            <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
              {filteredViews.map((view) => (
                <div
                  key={view.id}
                  className="group relative rounded-lg border border-gray-200 bg-white p-4 transition hover:border-primary-300 hover:shadow-md"
                >
                  <div className="flex items-start justify-between">
                    <div>
                      <h3 className="font-medium text-gray-900">{view.name}</h3>
                      <p className="mt-1 text-sm text-gray-500">Collection: {view.collection_name}</p>
                      <p className="mt-1 text-xs text-gray-400">
                        {view.schema?.fields?.length ?? view.schema?.field_count ?? 0} fields
                      </p>
                    </div>
                    <div className="flex gap-1 opacity-0 transition group-hover:opacity-100">
                      <button
                        onClick={() => loadViewForEditing(view.id)}
                        className="rounded p-1 text-gray-400 hover:bg-primary-50 hover:text-primary-600"
                        title="Edit"
                        disabled={isLoadingViewDetails}
                      >
                        <svg className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                          <path
                            strokeLinecap="round"
                            strokeLinejoin="round"
                            strokeWidth={2}
                            d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"
                          />
                        </svg>
                      </button>
                      <button
                        onClick={() => setDeletingView(view)}
                        className="rounded p-1 text-gray-400 hover:bg-red-50 hover:text-red-600"
                        title="Delete"
                      >
                        <svg className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                          <path
                            strokeLinecap="round"
                            strokeLinejoin="round"
                            strokeWidth={2}
                            d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
                          />
                        </svg>
                      </button>
                    </div>
                  </div>
                  <div className="mt-3 flex flex-wrap gap-1">
                    {(view.schema?.fields || []).slice(0, 4).map((field) => (
                      <span key={field.name} className="rounded bg-gray-100 px-2 py-0.5 text-xs text-gray-600">
                        {field.name}
                      </span>
                    ))}
                    {(view.schema?.fields?.length || 0) > 4 && (
                      <span className="rounded bg-gray-100 px-2 py-0.5 text-xs text-gray-600">
                        +{(view.schema?.fields?.length || 0) - 4} more
                      </span>
                    )}
                  </div>
                </div>
              ))}
            </div>
          )}
        </div>
      )}

      {/* Modals */}
      {(showCreateModal || editingView) && (
        <ViewModal
          view={editingView}
          collections={collections}
          workspaceId={currentWorkspace.id}
          onClose={() => {
            setShowCreateModal(false)
            setEditingView(null)
          }}
          onSave={handleSave}
        />
      )}

      {deletingView && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
          <div className="w-full max-w-md rounded-lg bg-white p-6 shadow-xl">
            <h2 className="text-xl font-semibold text-gray-900">Delete View</h2>
            <p className="mt-2 text-gray-600">
              Are you sure you want to delete the view "{deletingView.name}"? This action cannot be undone.
            </p>
            <div className="mt-6 flex justify-end gap-3">
              <Button variant="secondary" onClick={() => setDeletingView(null)}>
                Cancel
              </Button>
              <Button variant="danger" onClick={handleDelete}>
                Delete View
              </Button>
            </div>
          </div>
        </div>
      )}
    </div>
  )
}

export default Views