import { useState, useRef } from 'react'
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
import { Pencil, Trash2, Plus, Check, X, Upload, Download } from 'lucide-react'
import { toast } from 'sonner'
import {
  listRenderTemplates,
  createRenderTemplate,
  updateRenderTemplate,
  deleteRenderTemplate,
  reuploadBlendFile,
} from '../../api/renderTemplates'
import type { RenderTemplate } from '../../api/renderTemplates'
import { listOutputTypes } from '../../api/outputTypes'
import type { OutputType } from '../../api/outputTypes'

const ALL_CATEGORIES = [
  { key: 'TRB', label: 'TRB' },
  { key: 'Kugellager', label: 'Kugellager' },
  { key: 'CRB', label: 'CRB' },
  { key: 'Gleitlager', label: 'Gleitlager' },
  { key: 'SRB_TORB', label: 'SRB/TORB' },
  { key: 'Linear_schiene', label: 'Linear' },
  { key: 'Anschlagplatten', label: 'Anschlag' },
]

const EMPTY_FORM = {
  name: '',
  category_key: '' as string,
  output_type_id: '' as string,
  target_collection: 'Product',
  material_replace_enabled: false,
  lighting_only: false,
  shadow_catcher_enabled: false,
  camera_orbit: true,
}

export default function RenderTemplateTable() {
  const qc = useQueryClient()
  const [showAdd, setShowAdd] = useState(false)
  const [form, setForm] = useState(EMPTY_FORM)
  const [addFile, setAddFile] = useState<File | null>(null)
  const [editingId, setEditingId] = useState<string | null>(null)
  const [editDraft, setEditDraft] = useState<Partial<RenderTemplate>>({})
  const fileInputRef = useRef<HTMLInputElement>(null)
  const reuploadRef = useRef<HTMLInputElement>(null)
  const [reuploadId, setReuploadId] = useState<string | null>(null)

  const { data: templates, isLoading } = useQuery({
    queryKey: ['render-templates'],
    queryFn: listRenderTemplates,
  })

  const { data: outputTypes } = useQuery({
    queryKey: ['output-types-admin'],
    queryFn: () => listOutputTypes(true),
  })

  const createMut = useMutation({
    mutationFn: () => {
      if (!addFile) throw new Error('Please select a .blend file')
      const fd = new FormData()
      fd.append('name', form.name.trim())
      fd.append('file', addFile)
      fd.append('category_key', form.category_key || '')
      fd.append('output_type_id', form.output_type_id || '')
      fd.append('target_collection', form.target_collection || 'Product')
      fd.append('material_replace_enabled', String(form.material_replace_enabled))
      fd.append('lighting_only', String(form.lighting_only))
      fd.append('shadow_catcher_enabled', String(form.shadow_catcher_enabled))
      fd.append('camera_orbit', String(form.camera_orbit))
      return createRenderTemplate(fd)
    },
    onSuccess: () => {
      toast.success('Render template created')
      qc.invalidateQueries({ queryKey: ['render-templates'] })
      setForm(EMPTY_FORM)
      setAddFile(null)
      setShowAdd(false)
    },
    onError: (e: any) => toast.error(e.response?.data?.detail || 'Failed to create template'),
  })

  const updateMut = useMutation({
    mutationFn: ({ id, data }: { id: string; data: Record<string, unknown> }) =>
      updateRenderTemplate(id, data as any),
    onSuccess: () => {
      toast.success('Template updated')
      qc.invalidateQueries({ queryKey: ['render-templates'] })
      setEditingId(null)
    },
    onError: (e: any) => toast.error(e.response?.data?.detail || 'Failed to update'),
  })

  const deleteMut = useMutation({
    mutationFn: deleteRenderTemplate,
    onSuccess: () => {
      toast.success('Template deleted')
      qc.invalidateQueries({ queryKey: ['render-templates'] })
    },
    onError: (e: any) => toast.error(e.response?.data?.detail || 'Failed to delete'),
  })

  const reuploadMut = useMutation({
    mutationFn: ({ id, file }: { id: string; file: File }) => reuploadBlendFile(id, file),
    onSuccess: () => {
      toast.success('.blend file updated')
      qc.invalidateQueries({ queryKey: ['render-templates'] })
      setReuploadId(null)
    },
    onError: (e: any) => toast.error(e.response?.data?.detail || 'Failed to upload'),
  })

  function startEdit(t: RenderTemplate) {
    setEditingId(t.id)
    setEditDraft({
      name: t.name,
      category_key: t.category_key,
      output_type_id: t.output_type_id,
      target_collection: t.target_collection,
      material_replace_enabled: t.material_replace_enabled,
      lighting_only: t.lighting_only,
      shadow_catcher_enabled: t.shadow_catcher_enabled,
      camera_orbit: t.camera_orbit,
      is_active: t.is_active,
    })
  }

  function saveEdit() {
    if (!editingId) return
    updateMut.mutate({ id: editingId, data: editDraft as Record<string, unknown> })
  }

  const inputCls = 'px-2 py-1 text-sm border border-border-default rounded bg-surface focus:outline-none focus:ring-1 focus:ring-blue-400'

  return (
    <div>
      <div className="flex items-center justify-between mb-3">
        <h3 className="text-lg font-semibold text-content">Render Templates</h3>
        <button
          onClick={() => setShowAdd(!showAdd)}
          className="flex items-center gap-1 text-sm px-3 py-1.5 bg-blue-600 text-white rounded hover:bg-blue-700"
        >
          <Plus size={14} /> Add Template
        </button>
      </div>

      {/* Hidden file inputs */}
      <input
        ref={reuploadRef}
        type="file"
        accept=".blend"
        className="hidden"
        onChange={(e) => {
          const file = e.target.files?.[0]
          if (file && reuploadId) reuploadMut.mutate({ id: reuploadId, file })
          e.target.value = ''
        }}
      />

      <div className="overflow-x-auto">
        <table className="w-full text-sm border-collapse">
          <thead>
            <tr className="bg-surface-alt border-b text-left">
              <th className="px-3 py-2 font-medium">Name</th>
              <th className="px-3 py-2 font-medium">Category</th>
              <th className="px-3 py-2 font-medium">Output Type</th>
              <th className="px-3 py-2 font-medium">Collection</th>
              <th className="px-3 py-2 font-medium">Mat. Replace</th>
              <th className="px-3 py-2 font-medium">Lighting Only</th>
              <th className="px-3 py-2 font-medium" title="Enable Shadowcatcher collection (Cycles only)">Shadow Catcher</th>
              <th className="px-3 py-2 font-medium" title="Rotate camera around product instead of product rotation (faster GPU rendering)">Cam Orbit</th>
              <th className="px-3 py-2 font-medium">.blend File</th>
              <th className="px-3 py-2 font-medium">Active</th>
              <th className="px-3 py-2 font-medium w-24">Actions</th>
            </tr>
          </thead>
          <tbody>
            {/* Add row */}
            {showAdd && (
              <tr className="border-b bg-surface-hover/40">
                <td className="px-3 py-2">
                  <input
                    className={inputCls + ' w-40'}
                    placeholder="Template name"
                    value={form.name}
                    onChange={(e) => setForm({ ...form, name: e.target.value })}
                  />
                </td>
                <td className="px-3 py-2">
                  <select
                    className={inputCls}
                    value={form.category_key}
                    onChange={(e) => setForm({ ...form, category_key: e.target.value })}
                  >
                    <option value="">Any (default)</option>
                    {ALL_CATEGORIES.map((c) => (
                      <option key={c.key} value={c.key}>{c.label}</option>
                    ))}
                  </select>
                </td>
                <td className="px-3 py-2">
                  <select
                    className={inputCls}
                    value={form.output_type_id}
                    onChange={(e) => setForm({ ...form, output_type_id: e.target.value })}
                  >
                    <option value="">Any (default)</option>
                    {outputTypes?.map((ot: OutputType) => (
                      <option key={ot.id} value={ot.id}>{ot.name}</option>
                    ))}
                  </select>
                </td>
                <td className="px-3 py-2">
                  <input
                    className={inputCls + ' w-28'}
                    value={form.target_collection}
                    onChange={(e) => setForm({ ...form, target_collection: e.target.value })}
                  />
                </td>
                <td className="px-3 py-2 text-center">
                  <input
                    type="checkbox"
                    checked={form.material_replace_enabled}
                    onChange={(e) => setForm({ ...form, material_replace_enabled: e.target.checked })}
                  />
                </td>
                <td className="px-3 py-2 text-center">
                  <input
                    type="checkbox"
                    checked={form.lighting_only}
                    onChange={(e) => setForm({ ...form, lighting_only: e.target.checked })}
                  />
                </td>
                <td className="px-3 py-2 text-center">
                  <input
                    type="checkbox"
                    checked={form.shadow_catcher_enabled}
                    title="Enable Shadowcatcher collection (Cycles only)"
                    onChange={(e) => setForm({ ...form, shadow_catcher_enabled: e.target.checked })}
                  />
                </td>
                <td className="px-3 py-2 text-center">
                  <input
                    type="checkbox"
                    checked={form.camera_orbit}
                    title="Rotate camera around product (better GPU performance)"
                    onChange={(e) => setForm({ ...form, camera_orbit: e.target.checked })}
                  />
                </td>
                <td className="px-3 py-2">
                  <label className="flex items-center gap-1 text-xs cursor-pointer text-accent hover:text-accent-hover">
                    <Upload size={14} />
                    {addFile ? addFile.name : 'Choose .blend'}
                    <input
                      ref={fileInputRef}
                      type="file"
                      accept=".blend"
                      className="hidden"
                      onChange={(e) => setAddFile(e.target.files?.[0] || null)}
                    />
                  </label>
                </td>
                <td />
                <td className="px-3 py-2">
                  <div className="flex gap-1">
                    <button
                      onClick={() => createMut.mutate()}
                      disabled={!form.name.trim() || !addFile || createMut.isPending}
                      className="p-1 text-status-success-text hover:bg-surface-hover rounded disabled:opacity-40"
                      title="Create"
                    >
                      <Check size={16} />
                    </button>
                    <button
                      onClick={() => { setShowAdd(false); setForm(EMPTY_FORM); setAddFile(null) }}
                      className="p-1 text-content-muted hover:bg-surface-hover rounded"
                      title="Cancel"
                    >
                      <X size={16} />
                    </button>
                  </div>
                </td>
              </tr>
            )}

            {/* Template rows */}
            {isLoading && (
              <tr><td colSpan={11} className="px-3 py-4 text-center text-content-muted">Loading...</td></tr>
            )}
            {templates?.map((t) => {
              const isEditing = editingId === t.id
              return (
                <tr key={t.id} className="border-b hover:bg-surface-hover/50">
                  <td className="px-3 py-2">
                    {isEditing ? (
                      <input
                        className={inputCls + ' w-40'}
                        value={editDraft.name ?? t.name}
                        onChange={(e) => setEditDraft({ ...editDraft, name: e.target.value })}
                      />
                    ) : (
                      <span className="font-medium">{t.name}</span>
                    )}
                  </td>
                  <td className="px-3 py-2">
                    {isEditing ? (
                      <select
                        className={inputCls}
                        value={editDraft.category_key ?? t.category_key ?? ''}
                        onChange={(e) => setEditDraft({ ...editDraft, category_key: e.target.value || null })}
                      >
                        <option value="">Any</option>
                        {ALL_CATEGORIES.map((c) => (
                          <option key={c.key} value={c.key}>{c.label}</option>
                        ))}
                      </select>
                    ) : (
                      t.category_key || <span className="text-content-muted">Any</span>
                    )}
                  </td>
                  <td className="px-3 py-2">
                    {isEditing ? (
                      <select
                        className={inputCls}
                        value={editDraft.output_type_id ?? t.output_type_id ?? ''}
                        onChange={(e) => setEditDraft({ ...editDraft, output_type_id: e.target.value || null })}
                      >
                        <option value="">Any</option>
                        {outputTypes?.map((ot: OutputType) => (
                          <option key={ot.id} value={ot.id}>{ot.name}</option>
                        ))}
                      </select>
                    ) : (
                      t.output_type_name || <span className="text-content-muted">Any</span>
                    )}
                  </td>
                  <td className="px-3 py-2">
                    {isEditing ? (
                      <input
                        className={inputCls + ' w-28'}
                        value={editDraft.target_collection ?? t.target_collection}
                        onChange={(e) => setEditDraft({ ...editDraft, target_collection: e.target.value })}
                      />
                    ) : (
                      <code className="text-xs bg-surface-muted px-1 rounded">{t.target_collection}</code>
                    )}
                  </td>
                  <td className="px-3 py-2 text-center">
                    {isEditing ? (
                      <input
                        type="checkbox"
                        checked={editDraft.material_replace_enabled ?? t.material_replace_enabled}
                        onChange={(e) => setEditDraft({ ...editDraft, material_replace_enabled: e.target.checked })}
                      />
                    ) : (
                      t.material_replace_enabled ? (
                        <span className="text-status-success-text text-xs font-medium">Yes</span>
                      ) : (
                        <span className="text-content-muted text-xs">No</span>
                      )
                    )}
                  </td>
                  <td className="px-3 py-2 text-center">
                    {isEditing ? (
                      <input
                        type="checkbox"
                        checked={editDraft.lighting_only ?? t.lighting_only}
                        onChange={(e) => setEditDraft({ ...editDraft, lighting_only: e.target.checked })}
                      />
                    ) : (
                      t.lighting_only ? (
                        <span className="text-status-warning-text text-xs font-medium">HDR</span>
                      ) : (
                        <span className="text-content-muted text-xs">—</span>
                      )
                    )}
                  </td>
                  <td className="px-3 py-2 text-center">
                    {isEditing ? (
                      <input
                        type="checkbox"
                        checked={editDraft.shadow_catcher_enabled ?? t.shadow_catcher_enabled}
                        title="Enable Shadowcatcher collection (Cycles only)"
                        onChange={(e) => setEditDraft({ ...editDraft, shadow_catcher_enabled: e.target.checked })}
                      />
                    ) : (
                      t.shadow_catcher_enabled ? (
                        <span className="text-violet-600 text-xs font-medium">On</span>
                      ) : (
                        <span className="text-content-muted text-xs">—</span>
                      )
                    )}
                  </td>
                  <td className="px-3 py-2 text-center">
                    {isEditing ? (
                      <input
                        type="checkbox"
                        checked={editDraft.camera_orbit ?? t.camera_orbit}
                        title="Rotate camera around product (better GPU performance)"
                        onChange={(e) => setEditDraft({ ...editDraft, camera_orbit: e.target.checked })}
                      />
                    ) : (
                      t.camera_orbit ? (
                        <span className="text-teal-600 text-xs font-medium">Cam</span>
                      ) : (
                        <span className="text-content-muted text-xs">Obj</span>
                      )
                    )}
                  </td>
                  <td className="px-3 py-2">
                    <div className="flex items-center gap-1">
                      <span className="text-xs text-content-secondary truncate max-w-[120px]" title={t.original_filename}>
                        {t.original_filename}
                      </span>
                      <button
                        onClick={() => { setReuploadId(t.id); reuploadRef.current?.click() }}
                        className="p-0.5 text-accent hover:bg-surface-hover rounded"
                        title="Re-upload .blend"
                      >
                        <Upload size={12} />
                      </button>
                      <a
                        href={`/api/render-templates/${t.id}/download`}
                        className="p-0.5 text-accent hover:bg-surface-hover rounded"
                        title="Download .blend"
                      >
                        <Download size={12} />
                      </a>
                    </div>
                  </td>
                  <td className="px-3 py-2 text-center">
                    {isEditing ? (
                      <input
                        type="checkbox"
                        checked={editDraft.is_active ?? t.is_active}
                        onChange={(e) => setEditDraft({ ...editDraft, is_active: e.target.checked })}
                      />
                    ) : (
                      t.is_active ? (
                        <span className="inline-block w-2 h-2 rounded-full bg-green-500" title="Active" />
                      ) : (
                        <span className="inline-block w-2 h-2 rounded-full bg-surface-muted" title="Inactive" />
                      )
                    )}
                  </td>
                  <td className="px-3 py-2">
                    {isEditing ? (
                      <div className="flex gap-1">
                        <button onClick={saveEdit} className="p-1 text-status-success-text hover:bg-surface-hover rounded" title="Save">
                          <Check size={16} />
                        </button>
                        <button onClick={() => setEditingId(null)} className="p-1 text-content-muted hover:bg-surface-muted rounded" title="Cancel">
                          <X size={16} />
                        </button>
                      </div>
                    ) : (
                      <div className="flex gap-1">
                        <button onClick={() => startEdit(t)} className="p-1 text-accent hover:bg-surface-hover rounded" title="Edit">
                          <Pencil size={14} />
                        </button>
                        <button
                          onClick={() => {
                            if (confirm(`Delete template "${t.name}"?`)) deleteMut.mutate(t.id)
                          }}
                          className="p-1 text-red-500 hover:bg-red-50 rounded"
                          title="Delete"
                        >
                          <Trash2 size={14} />
                        </button>
                      </div>
                    )}
                  </td>
                </tr>
              )
            })}

            {!isLoading && (!templates || templates.length === 0) && !showAdd && (
              <tr>
                <td colSpan={11} className="px-3 py-6 text-center text-content-muted">
                  No render templates configured. Click "Add Template" to create one.
                </td>
              </tr>
            )}
          </tbody>
        </table>
      </div>
      <p className="mt-2 text-xs text-content-muted">
        Templates define pre-designed .blend studio setups. When rendering, the system matches templates by Category + Output Type with fallback cascade.
      </p>
    </div>
  )
}
