leocrm/frontend/src/components/workflows/WorkflowEditor.tsx

import { asError } from '@/utils/errorTypes';
import React, { useState, useEffect } from 'react';
// TODO: P2-F21 — Replace hardcoded triggerEventOptions with backend config
import { useTranslation } from 'react-i18next';
import { Modal } from '@/components/ui/Modal';
import { Button } from '@/components/ui/Button';
import { Input } from '@/components/ui/Input';
import { Select } from '@/components/ui/Select';
import { useToast } from '@/components/ui/Toast';
import { StepConfigPanel } from './StepConfigPanel';
import {
  useCreateWorkflow,
  useUpdateWorkflow,
} from '@/api/workflows';
import type { Workflow, WorkflowStep, WorkflowCreateInput, WorkflowUpdateInput } from '@/api/workflows';
import { ArrowUp, ArrowDown, Plus, Trash2 } from 'lucide-react';

const triggerEventOptions = [
  { value: '', label: '— Kein Trigger —' },
  { value: 'contact.created', label: 'contact.created' },
  { value: 'contact.updated', label: 'contact.updated' },
  { value: 'deal.created', label: 'deal.created' },
  { value: 'deal.stage_changed', label: 'deal.stage_changed' },
  { value: 'deal.won', label: 'deal.won' },
  { value: 'deal.lost', label: 'deal.lost' },
  { value: 'task.completed', label: 'task.completed' },
  { value: 'task.overdue', label: 'task.overdue' },
  { value: 'manual', label: 'manual' },
];

interface EditorFormState {
  name: string;
  description: string;
  trigger_event: string;
  is_active: boolean;
  steps: WorkflowStep[];
}

const emptyStep = (): WorkflowStep => ({
  name: '',
  type: 'action',
  config: {},
  description: null,
});

const emptyForm: EditorFormState = {
  name: '',
  description: '',
  trigger_event: '',
  is_active: true,
  steps: [],
};

export interface WorkflowEditorProps {
  open: boolean;
  workflow?: Workflow | null;
  onClose: () => void;
}

export function WorkflowEditor({ open, workflow, onClose }: WorkflowEditorProps) {
  const { t } = useTranslation();
  const toast = useToast();
  const createMutation = useCreateWorkflow();
  const updateMutation = useUpdateWorkflow();

  const isEdit = !!workflow;
  const [form, setForm] = useState<EditorFormState>(emptyForm);

  useEffect(() => {
    if (open) {
      if (workflow) {
        setForm({
          name: workflow.name,
          description: workflow.description ?? '',
          trigger_event: workflow.trigger_event ?? '',
          is_active: workflow.is_active,
          steps: workflow.steps?.length
            ? workflow.steps.map((s) => ({
                name: s.name,
                type: s.type,
                config: s.config ?? {},
                description: s.description ?? null,
              }))
            : [],
        });
      } else {
        setForm({ ...emptyForm });
      }
    }
  }, [open, workflow]);

  const updateField = <K extends keyof EditorFormState>(
    key: K,
    value: EditorFormState[K]
  ) => {
    setForm((prev) => ({ ...prev, [key]: value }));
  };

  const addStep = () => {
    setForm((prev) => ({ ...prev, steps: [...prev.steps, emptyStep()] }));
  };

  const updateStep = (index: number, updated: WorkflowStep) => {
    setForm((prev) => {
      const steps = [...prev.steps];
      steps[index] = updated;
      return { ...prev, steps };
    });
  };

  const removeStep = (index: number) => {
    setForm((prev) => ({
      ...prev,
      steps: prev.steps.filter((_, i) => i !== index),
    }));
  };

  const moveStep = (index: number, dir: 'up' | 'down') => {
    setForm((prev) => {
      const steps = [...prev.steps];
      const target = dir === 'up' ? index - 1 : index + 1;
      if (target < 0 || target >= steps.length) return prev;
      [steps[index], steps[target]] = [steps[target], steps[index]];
      return { ...prev, steps };
    });
  };

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

    if (!form.name.trim()) {
      toast.error('Name ist erforderlich');
      return;
    }

    if (form.steps.length === 0) {
      toast.error('Mindestens ein Schritt ist erforderlich');
      return;
    }

    const hasEmptyStepName = form.steps.some((s) => !s.name.trim());
    if (hasEmptyStepName) {
      toast.error('Alle Schritte muessen einen Namen haben');
      return;
    }

    try {
      if (isEdit && workflow) {
        const data: WorkflowUpdateInput = {
          name: form.name,
          description: form.description || null,
          trigger_event: form.trigger_event || null,
          steps: form.steps,
          is_active: form.is_active,
        };
        await updateMutation.mutateAsync({ id: workflow.id, data });
        toast.success('Workflow aktualisiert');
      } else {
        const data: WorkflowCreateInput = {
          name: form.name,
          description: form.description || null,
          trigger_event: form.trigger_event || null,
          steps: form.steps,
          is_active: form.is_active,
        };
        await createMutation.mutateAsync(data);
        toast.success('Workflow erstellt');
      }
      onClose();
    } catch (err: unknown) { const errObj = asError(err);
      // Show detailed validation errors from backend (422)
      if (errObj.validationErrors) {
        const details = Object.entries(errObj.validationErrors)
          .map(([field, msgs]) => `${field}: ${(msgs as string[]).join(', ')}`)
          .join('; ');
        toast.error(`Validierungsfehler: ${details}`);
      } else if (errObj.detail) {
        toast.error(errObj.detail);
      } else {
        toast.error(errObj.message || 'Fehler beim Speichern');
      }
    }
  };

  const isSaving = createMutation.isPending || updateMutation.isPending;

  return (
    <Modal
      open={open}
      onClose={onClose}
      title={isEdit ? 'Workflow bearbeiten' : 'Neuer Workflow'}
      size="xl"
    >
      <form onSubmit={handleSubmit} className="space-y-6">
        <div className="grid grid-cols-1 gap-4">
          <Input
            label="Name"
            required
            value={form.name}
            onChange={(e) => updateField('name', e.target.value)}
            placeholder="z.B. Deal-Genehmigungsprozess"
          />
          <div>
            <label className="block text-sm font-medium text-secondary-700 mb-1">
              Beschreibung
            </label>
            <textarea
              value={form.description}
              onChange={(e) => updateField('description', e.target.value)}
              rows={2}
              className="w-full rounded-lg border border-secondary-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary-500"
              placeholder="Optionale Beschreibung"
            />
          </div>
          <Select
            label="Trigger-Event"
            options={triggerEventOptions}
            value={form.trigger_event}
            onChange={(e) => updateField('trigger_event', e.target.value)}
          />
          <label className="flex items-center gap-2 text-sm">
            <input
              type="checkbox"
              checked={form.is_active}
              onChange={(e) => updateField('is_active', e.target.checked)}
              className="rounded border-secondary-300 text-primary-600 focus:ring-primary-500"
            />
            Aktiv
          </label>
        </div>

        {/* Steps section */}
        <div>
          <div className="flex items-center justify-between mb-3">
            <label className="text-sm font-medium text-secondary-700">
              Schritte
            </label>
            <Button
              size="sm"
              variant="ghost"
              onClick={addStep}
              type="button"
              icon={<Plus className="h-4 w-4" />}
            >
              Schritt hinzufuegen
            </Button>
          </div>
          {form.steps.length === 0 && (
            <p className="text-sm text-secondary-400 italic">
              Keine Schritte definiert. Klicke auf Schritt hinzufuegen.
            </p>
          )}
          <div className="space-y-4">
            {form.steps.map((step, i) => (
              <div key={i} className="relative">
                <div className="flex items-center justify-between mb-2">
                  <span className="text-xs font-medium text-secondary-500">
                    Schritt {i + 1}
                  </span>
                  <div className="flex items-center gap-1">
                    <button
                      type="button"
                      onClick={() => moveStep(i, 'up')}
                      disabled={i === 0}
                      className="text-secondary-400 hover:text-secondary-700 disabled:opacity-30 p-1"
                      aria-label="Nach oben"
                    >
                      <ArrowUp className="h-4 w-4" />
                    </button>
                    <button
                      type="button"
                      onClick={() => moveStep(i, 'down')}
                      disabled={i === form.steps.length - 1}
                      className="text-secondary-400 hover:text-secondary-700 disabled:opacity-30 p-1"
                      aria-label="Nach unten"
                    >
                      <ArrowDown className="h-4 w-4" />
                    </button>
                    <button
                      type="button"
                      onClick={() => removeStep(i)}
                      className="text-danger-500 hover:text-danger-700 p-1"
                      aria-label="Schritt entfernen"
                    >
                      <Trash2 className="h-4 w-4" />
                    </button>
                  </div>
                </div>
                <StepConfigPanel
                  step={step}
                  onChange={(updated) => updateStep(i, updated)}
                />
              </div>
            ))}
          </div>
        </div>

        <div className="flex justify-end gap-3 pt-4 border-t border-secondary-200">
          <Button variant="secondary" onClick={onClose} type="button">
            Abbrechen
          </Button>
          <Button type="submit" isLoading={isSaving}>
            {isEdit ? 'Speichern' : 'Erstellen'}
          </Button>
        </div>
      </form>
    </Modal>
  );
}