import { useState } from 'react'
import { Bookmark, Trash2 } from 'lucide-react'
import { useAuthStore } from '@/store/authStore'
import { usePermissions } from '@/hooks/usePermissions'
import { stepsApi } from '@/api/steps'
import { StepLibraryBrowser } from '@/components/step-library/StepLibraryBrowser'
import { StepFormModal } from '@/components/step-library/StepFormModal'
import { toast } from '@/lib/toast'
import type { Step, StepListItem } from '@/types/step'

export default function StepLibraryPage() {
  const user = useAuthStore((s) => s.user)
  const { canCreateSteps } = usePermissions()

  // Create/edit modal state
  const [createOpen, setCreateOpen] = useState(false)
  const [editingStep, setEditingStep] = useState<Step | null>(null)

  // Delete confirmation state
  const [deletingStep, setDeletingStep] = useState<StepListItem | null>(null)
  const [isDeleting, setIsDeleting] = useState(false)
  const [deleteError, setDeleteError] = useState<string | null>(null)

  // Increment to trigger StepLibraryBrowser reload
  const [refreshKey, setRefreshKey] = useState(0)
  const refresh = () => setRefreshKey(k => k + 1)

  // Fetch full step before opening edit modal (StepListItem lacks content)
  const handleEdit = async (step: StepListItem) => {
    try {
      const full = await stepsApi.get(step.id)
      setEditingStep(full)
    } catch {
      toast.error('Failed to load step for editing')
    }
  }

  const handleDeleteRequest = (step: StepListItem) => {
    setDeletingStep(step)
  }

  const handleDeleteConfirm = async () => {
    if (!deletingStep) return
    setIsDeleting(true)
    setDeleteError(null)
    try {
      await stepsApi.delete(deletingStep.id)
      setDeletingStep(null)
      refresh()
    } catch (err) {
      console.error('Failed to delete step:', err)
      setDeleteError('Failed to delete step. Please try again.')
    } finally {
      setIsDeleting(false)
    }
  }

  const handleSave = async (step: StepListItem) => {
    try {
      const full = await stepsApi.get(step.id)
      await stepsApi.create({
        title: full.title,
        step_type: full.step_type,
        content: full.content,
        visibility: 'private',
        category_id: full.category_id,
        tags: full.tags,
      })
      toast.success(`"${full.title}" saved to My Steps`)
      refresh()
    } catch {
      toast.error('Failed to save step to your library')
    }
  }

  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  const handleFormSuccess = (_step: Step) => {
    setCreateOpen(false)
    setEditingStep(null)
    refresh()
  }

  const handleCloseModal = () => {
    setCreateOpen(false)
    setEditingStep(null)
  }

  return (
    <div className="flex h-full flex-col">
      {/* Page Header */}
      <div className="flex items-center justify-between border-b border-border px-6 py-4">
        <div className="flex items-center gap-3">
          <span title="Step Library">
            <Bookmark className="h-6 w-6 text-muted-foreground" />
          </span>
          <div>
            <h1 className="text-xl font-bold font-heading text-foreground">Step Library</h1>
            <p className="text-sm text-muted-foreground">Reusable steps you can insert into any flow</p>
          </div>
        </div>
        {canCreateSteps && (
          <button
            onClick={() => setCreateOpen(true)}
            className="rounded-md bg-gradient-brand px-4 py-2 text-sm font-medium text-white shadow-lg shadow-primary/20 hover:opacity-90"
          >
            + Create Step
          </button>
        )}
      </div>

      {/* Browser fills remaining height */}
      <div className="flex-1 overflow-hidden">
        <StepLibraryBrowser
          onEdit={(step) => { handleEdit(step) }}
          onDelete={handleDeleteRequest}
          onSave={handleSave}
          currentUserId={user?.id}
          refreshKey={refreshKey}
          showCreateButton={false}
        />
      </div>

      {/* Create / Edit Modal */}
      <StepFormModal
        isOpen={createOpen || !!editingStep}
        onClose={handleCloseModal}
        onSuccess={handleFormSuccess}
        editingStep={editingStep}
      />

      {/* Delete Confirmation Dialog */}
      {deletingStep && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 backdrop-blur-sm p-4">
          <div className="w-full max-w-sm rounded-xl bg-card border border-border p-6 shadow-lg">
            <div className="mb-4 flex items-center gap-3">
              <div className="rounded-full bg-red-400/10 p-2">
                <Trash2 className="h-5 w-5 text-red-400" />
              </div>
              <h2 className="text-base font-semibold text-foreground">Delete Step</h2>
            </div>
            <p className="mb-2 text-sm text-muted-foreground">
              Are you sure you want to delete{' '}
              <span className="font-medium text-foreground">"{deletingStep.title}"</span>?
            </p>
            <p className="mb-6 text-xs text-muted-foreground">This cannot be undone.</p>
            {deleteError && (
              <p className="mb-4 text-sm text-red-400">{deleteError}</p>
            )}
            <div className="flex gap-2">
              <button
                onClick={() => { setDeletingStep(null); setDeleteError(null) }}
                disabled={isDeleting}
                className="flex-1 rounded-md border border-border px-4 py-2 text-sm font-medium text-muted-foreground hover:bg-accent hover:text-foreground disabled:opacity-50"
              >
                Cancel
              </button>
              <button
                onClick={handleDeleteConfirm}
                disabled={isDeleting}
                className="flex-1 rounded-md bg-red-500 px-4 py-2 text-sm font-medium text-white hover:bg-red-600 disabled:opacity-50"
              >
                {isDeleting ? 'Deleting...' : 'Delete'}
              </button>
            </div>
          </div>
        </div>
      )}

    </div>
  )
}
