import { useCollectionManager, useCompile } from '@nocobase/client';
import { useFlowContext } from './FlowContext';
import { NAMESPACE } from './locale';
import { instructions, useAvailableUpstreams, useNodeContext } from './nodes';
import { triggers } from './triggers';

export type VariableOption = {
  key?: string;
  value: string;
  label: string;
  children?: VariableOptions;
};

export type VariableOptions = VariableOption[] | null;

const VariableTypes = [
  {
    title: `{{t("Node result", { ns: "${NAMESPACE}" })}}`,
    value: '$jobsMapByNodeId',
    options(types) {
      const current = useNodeContext();
      const upstreams = useAvailableUpstreams(current);
      const options: VariableOption[] = [];
      upstreams.forEach((node) => {
        const instruction = instructions.get(node.type);
        const subOptions = instruction.getOptions?.(node.config, types);
        if (subOptions) {
          options.push({
            key: node.id.toString(),
            value: node.id.toString(),
            label: node.title ?? `#${node.id}`,
            children: subOptions,
          });
        }
      });
      return options;
    },
  },
  {
    title: `{{t("Trigger variables", { ns: "${NAMESPACE}" })}}`,
    value: '$context',
    options(types) {
      const { workflow } = useFlowContext();
      const trigger = triggers.get(workflow.type);
      return trigger?.getOptions?.(workflow.config, types) ?? null;
    },
  },
  {
    title: `{{t("System variables", { ns: "${NAMESPACE}" })}}`,
    value: '$system',
    options(types) {
      return [
        ...(!types || types.includes('date') ? [
          {
            key: 'now',
            value: 'now',
            label: `{{t("System time")}}`,
          }
        ] : [])
      ];
    }
  },
];

export const BaseTypeSets = {
  boolean: new Set(['checkbox']),
  number: new Set(['number', 'percent']),
  string: new Set(['input', 'password', 'email', 'phone', 'select', 'radioGroup', 'text', 'markdown', 'richText', 'expression', 'time']),
  date: new Set(['date', 'createdAt', 'updatedAt']),
};

// { type: 'reference', options: { collection: 'users', multiple: false } }
// { type: 'reference', options: { collection: 'attachments', multiple: false } }
// { type: 'reference', options: { collection: 'myExpressions', entity: false } }

function matchFieldType(field, type): Boolean {
  const inputType = typeof type;
  if (inputType === 'string') {
    return Boolean(BaseTypeSets[type]?.has(field.interface));
  }

  if (inputType === 'object' && type.type === 'reference') {
    if (isAssociationField(field)) {
      return type.options?.entity && (field.collectionName === type.options?.collection || type.options?.collection === '*');
    } else if (field.isForeignKey) {
      return (
        (field.collectionName === type.options?.collection && field.name === 'id') ||
        (field.target === type.options?.collection)
      );
    } else {
      return false;
    }
  }

  if (inputType === 'function') {
    return type(field);
  }

  return false;
}

function isAssociationField(field): boolean {
  return ['belongsTo', 'hasOne', 'hasMany', 'belongsToMany'].includes(field.type);
}

export function filterTypedFields(fields, types, depth = 1) {
  if (!types) {
    return fields;
  }
  return fields.filter((field) => {
    if (isAssociationField(field) && depth && filterTypedFields(useNormalizedFields(field.target), types, depth - 1).length) {
      return true;
    }
    return types.some((type) => matchFieldType(field, type));
  });
}

export function useWorkflowVariableOptions(types?) {
  const compile = useCompile();
  const options = VariableTypes.map((item: any) => {
    const opts = typeof item.options === 'function' ? item.options(types).filter(Boolean) : item.options;
    return {
      label: compile(item.title),
      value: item.value,
      key: item.value,
      children: compile(opts),
      disabled: opts && !opts.length,
    };
  });
  return options;
}

function useNormalizedFields(collectionName) {
  const compile = useCompile();
  const { getCollection } = useCollectionManager();
  const collection = getCollection(collectionName);
  if (!collection) {
    return [];
  }
  const { fields } = collection;
  const foreignKeyFields: any[] = [];
  const otherFields: any[] = [];
  fields.forEach(field => {
    if (field.isForeignKey) {
      foreignKeyFields.push(field);
    } else {
      otherFields.push(field);
    }
  });
  for (let i = otherFields.length - 1; i >= 0; i--) {
    const field = otherFields[i];
    if (field.type === 'belongsTo') {
      const foreignKeyField = foreignKeyFields.find(f => f.name === field.foreignKey);
      if (foreignKeyField) {
        otherFields.splice(i, 0, {
          ...field,
          ...foreignKeyField,
          uiSchema: {
            ...field.uiSchema,
            title: field.uiSchema?.title ? `${compile(field.uiSchema?.title)} ID` : foreignKeyField.name,
          }
        });
      } else {
        otherFields.splice(i, 0, {
          ...field,
          name: field.foreignKey,
          type: 'bigInt',
          isForeignKey: true,
          interface: field.interface,
          uiSchema: {
            ...field.uiSchema,
            title: field.uiSchema?.title ? `${compile(field.uiSchema?.title)} ID` : field.name,
          }
        });
      }
    } else if (field.type === 'context' && field.collectionName === 'users') {
      const belongsToField = otherFields.find(f => f.type === 'belongsTo' && f.target === 'users' && f.foreignKey === field.name) ?? {};
      otherFields.splice(i, 0, {
        ...field,
        type: field.dataType,
        interface: belongsToField.interface,
        uiSchema: {
          ...belongsToField.uiSchema,
          title: belongsToField.uiSchema?.title ? `${compile(belongsToField.uiSchema?.title)} ID` : field.name
        }
      });
    }
  }

  return otherFields.filter(field => field.interface && !field.hidden);
}

export function useCollectionFieldOptions(options): VariableOption[] {
  const { fields, collection, types, depth = 1 } = options;
  const compile = useCompile();
  const normalizedFields = fields ?? useNormalizedFields(collection);
  const result: VariableOption[] = filterTypedFields(normalizedFields, types, depth)
    .filter(field => !isAssociationField(field) || depth)
    .map(field => {
      const label = compile(field.uiSchema?.title || field.name);
      return {
        label,
        key: field.name,
        value: field.name,
        children: isAssociationField(field) && depth
          ? useCollectionFieldOptions({ collection: field.target, types, depth: depth - 1 })
          : null
      };
    });

  return result;
}