import { Tabs, TextInput, Textarea, Tooltip, Switch } from "@mantine/core";
import {
   objectCleanEmpty,
   omitKeys,
   ucFirstAllSnakeToPascalWithSpaces,
   s,
   stringIdentifier,
} from "bknd/utils";
import {
   type TAppDataEntityFields,
   fieldsSchemaObject as originalFieldsSchemaObject,
} from "data/data-schema";
import { omit } from "lodash-es";
import { forwardRef, memo, useEffect, useImperativeHandle } from "react";
import { type FieldArrayWithId, type UseFormReturn, useFieldArray, useForm } from "react-hook-form";
import { TbGripVertical, TbSettings, TbTrash } from "react-icons/tb";
import { twMerge } from "tailwind-merge";
import { Button } from "ui/components/buttons/Button";
import { IconButton } from "ui/components/buttons/IconButton";
import { JsonViewer } from "ui/components/code/JsonViewer";
import { MantineSwitch } from "ui/components/form/hook-form-mantine/MantineSwitch";
import { JsonSchemaForm } from "ui/components/form/json-schema";
import { type SortableItemProps, SortableList } from "ui/components/list/SortableList";
import { Popover } from "ui/components/overlay/Popover";
import { type TFieldSpec, fieldSpecs } from "ui/modules/data/components/fields-specs";
import { dataFieldsUiSchema } from "../../settings/routes/data.settings";
import { useRoutePathState } from "ui/hooks/use-route-path-state";
import { MantineSelect } from "ui/components/form/hook-form-mantine/MantineSelect";
import type { TPrimaryFieldFormat } from "data/fields/PrimaryField";
import { standardSchemaResolver } from "@hookform/resolvers/standard-schema";
import ErrorBoundary from "ui/components/display/ErrorBoundary";
import { SchemaEditable } from "ui/client/bknd";

const fieldsSchemaObject = originalFieldsSchemaObject;
const fieldsSchema = s.anyOf(Object.values(fieldsSchemaObject));

const fieldSchema = s.strictObject({
   name: stringIdentifier,
   new: s.boolean({ const: true }).optional(),
   field: fieldsSchema,
});
type TFieldSchema = s.Static<typeof fieldSchema>;

const schema = s.strictObject({
   fields: s.array(fieldSchema),
});
type TFieldsFormSchema = s.Static<typeof schema>;

const fieldTypes = Object.keys(fieldsSchemaObject);
const defaultType = fieldTypes[0];
const commonProps = ["label", "description", "required", "fillable", "hidden", "virtual"];

function specificFieldSchema(type: keyof typeof fieldsSchemaObject) {
   //console.log("specificFieldSchema", type);
   return s.object(
      omitKeys(fieldsSchemaObject[type]?.properties.config.properties, commonProps as any),
   );
}

export type EntityFieldsFormProps = {
   fields: TAppDataEntityFields;
   onChange?: (formData: TAppDataEntityFields) => void;
   sortable?: boolean;
   additionalFieldTypes?: (TFieldSpec & { onClick: () => void })[];
   routePattern?: string;
   defaultPrimaryFormat?: TPrimaryFieldFormat;
   isNew?: boolean;
   readonly?: boolean;
};

export type EntityFieldsFormRef = {
   getValues: () => TFieldsFormSchema;
   getData: () => TAppDataEntityFields;
   isValid: () => boolean;
   getErrors: () => any;
   reset: () => void;
};

export const EntityFieldsForm = forwardRef<EntityFieldsFormRef, EntityFieldsFormProps>(
   function EntityFieldsForm(
      { fields: _fields, sortable, additionalFieldTypes, routePattern, isNew, readonly, ...props },
      ref,
   ) {
      const entityFields = Object.entries(_fields).map(([name, field]) => ({
         name,
         field,
      }));

      const {
         control,
         formState: { isValid, errors },
         getValues,
         watch,
         register,
         setValue,
         setError,
         reset,
      } = useForm({
         mode: "all",
         resolver: standardSchemaResolver(schema),
         defaultValues: {
            fields: entityFields,
         } as TFieldsFormSchema,
      });
      const { fields, append, remove, move } = useFieldArray({
         control,
         name: "fields",
      });

      function toCleanValues(formData: TFieldsFormSchema): TAppDataEntityFields {
         return Object.fromEntries(
            formData.fields.map((field) => [field.name, objectCleanEmpty(field.field)]),
         );
      }

      useEffect(() => {
         if (props?.onChange) {
            watch((data: any) => {
               props?.onChange?.(toCleanValues(data));
            });
         }
      }, []);

      useImperativeHandle(ref, () => ({
         reset,
         getValues: () => getValues(),
         getData: () => {
            return toCleanValues(getValues());
         },
         isValid: () => isValid,
         getErrors: () => errors,
      }));

      function handleAppend(_type: keyof typeof fieldsSchemaObject) {
         append({
            name: "",
            new: true,
            field: {
               type: _type,
               config: fieldsSchemaObject[_type]?.properties.config.template() as any,
            },
         });
      }

      const formProps = {
         watch,
         register,
         setValue,
         getValues,
         control,
         setError,
      };
      return (
         <>
            <div className="flex flex-col gap-6">
               <div className="flex flex-col gap-3">
                  <div className="flex flex-col gap-4">
                     {sortable ? (
                        <SortableList
                           data={fields}
                           key={fields.length}
                           onReordered={move}
                           extractId={(item) => item.id}
                           disableIndices={[0]}
                           renderItem={({ dnd, ...props }, index) => (
                              <EntityFieldMemo
                                 readonly={readonly}
                                 key={props.id}
                                 field={props as any}
                                 index={index}
                                 form={formProps}
                                 errors={errors}
                                 remove={remove}
                                 dnd={dnd}
                                 routePattern={routePattern}
                                 primary={{
                                    defaultFormat: props.defaultPrimaryFormat,
                                    editable: isNew,
                                 }}
                              />
                           )}
                        />
                     ) : (
                        <div>
                           {fields.map((field, index) => (
                              <EntityField
                                 readonly={readonly}
                                 key={field.id}
                                 field={field as any}
                                 index={index}
                                 form={formProps}
                                 errors={errors}
                                 remove={remove}
                                 routePattern={routePattern}
                                 primary={{
                                    defaultFormat: props.defaultPrimaryFormat,
                                    editable: isNew,
                                 }}
                              />
                           ))}
                        </div>
                     )}

                     <SchemaEditable>
                        <Popover
                           className="flex flex-col w-full"
                           target={({ toggle }) => (
                              <SelectType
                                 additionalFieldTypes={additionalFieldTypes}
                                 onSelected={toggle}
                                 onSelect={(type) => {
                                    handleAppend(type as any);
                                 }}
                              />
                           )}
                        >
                           <Button className="justify-center">Add Field</Button>
                        </Popover>
                     </SchemaEditable>
                  </div>
               </div>
            </div>
         </>
      );
   },
);

const SelectType = ({
   onSelect,
   additionalFieldTypes = [],
   onSelected,
}: {
   onSelect: (type: string) => void;
   additionalFieldTypes?: (TFieldSpec & { onClick?: () => void })[];
   onSelected?: () => void;
}) => {
   const types: (TFieldSpec & { onClick?: () => void })[] = fieldSpecs.filter(
      (s) => s.addable !== false,
   );

   if (additionalFieldTypes) {
      types.push(...additionalFieldTypes);
   }

   return (
      <div className="flex flex-row gap-2 justify-center flex-wrap">
         {types.map((type) => (
            <Button
               key={type.type}
               IconLeft={type.icon}
               variant="ghost"
               onClick={() => {
                  if (type.addable !== false) {
                     onSelect(type.type);
                  } else {
                     type.onClick?.();
                  }
                  onSelected?.();
               }}
            >
               {type.label}
            </Button>
         ))}
      </div>
   );
};

const Debug = ({ watch, errors }) => {
   return (
      <div>
         <div>
            {Object.entries(errors).map(([key, value]) => (
               <p key={key}>
                  {/* @ts-ignore */}
                  {key}: {value.message}
               </p>
            ))}
         </div>
         <pre>{JSON.stringify(watch(), null, 2)}</pre>
      </div>
   );
};

const EntityFieldMemo = memo(EntityField, (prev, next) => {
   return prev.field.id !== next.field.id;
});

function EntityField({
   field,
   index,
   form: { watch, register, setValue, getValues, control, setError },
   remove,
   errors,
   dnd,
   routePattern,
   primary,
   readonly,
}: {
   field: FieldArrayWithId<TFieldsFormSchema, "fields", "id">;
   index: number;
   form: Pick<
      UseFormReturn<any>,
      "watch" | "register" | "setValue" | "getValues" | "control" | "setError"
   >;
   remove: (index: number) => void;
   errors: any;
   dnd?: SortableItemProps;
   routePattern?: string;
   primary?: {
      defaultFormat?: TPrimaryFieldFormat;
      editable?: boolean;
   };
   readonly?: boolean;
}) {
   const prefix = `fields.${index}.field` as const;
   const type = field.field.type;
   const name = watch(`fields.${index}.name`);
   const { active, toggle } = useRoutePathState(routePattern ?? "", name);
   const fieldSpec = fieldSpecs.find((s) => s.type === type)!;
   const specificData = omit(field.field.config, commonProps);
   const disabled = fieldSpec.disabled || [];
   const hidden = fieldSpec.hidden || [];
   const dragDisabled = index === 0;
   const hasErrors = !!errors?.fields?.[index];
   const is_primary = type === "primary";

   function handleDelete(index: number) {
      return () => {
         if (name.length === 0) {
            remove(index);
            toggle();
         } else if (window.confirm(`Sure to delete "${name}"?`)) {
            remove(index);
            toggle();
         }
      };
   }
   //console.log("register", register(`${prefix}.config.required`));
   const dndProps = dnd ? { ...dnd.provided.draggableProps, ref: dnd.provided.innerRef } : {};

   return (
      <div
         key={field.id}
         className={twMerge(
            "flex flex-col border border-muted rounded bg-background mb-2",
            active && "mb-6",
            hasErrors && "border-red-500 ",
         )}
         {...dndProps}
      >
         <div className="flex flex-row gap-2 px-2 py-2">
            {dnd ? (
               <div className="flex items-center" {...dnd.provided.dragHandleProps}>
                  <IconButton Icon={TbGripVertical} className="mt-1" disabled={dragDisabled} />
               </div>
            ) : null}
            <div className="flex flex-row flex-grow gap-4 items-center md:mr-6">
               <Tooltip label={fieldSpec.label}>
                  <div className="flex flex-row items-center p-2 bg-primary/5 rounded">
                     <fieldSpec.icon className="size-5" />
                  </div>
               </Tooltip>

               {field.new ? (
                  <TextInput
                     error={!!errors?.fields?.[index]?.name.message}
                     placeholder="Enter a property name..."
                     classNames={{
                        root: "w-full h-full",
                        wrapper: "font-mono h-full",
                        input: "pt-px !h-full",
                     }}
                     {...register(`fields.${index}.name`)}
                     disabled={!field.new}
                  />
               ) : (
                  <div className="font-mono flex-grow flex flex-row gap-3">
                     <span>{name}</span>
                     {field.field.config?.label && (
                        <span className="opacity-50">{field.field.config?.label}</span>
                     )}
                  </div>
               )}
               <div className="flex-col gap-1 hidden md:flex">
                  {is_primary ? (
                     <>
                        <MantineSelect
                           data={["integer", "uuid"]}
                           defaultValue={primary?.defaultFormat}
                           disabled={!primary?.editable}
                           placeholder="Select format"
                           name={`${prefix}.config.format`}
                           allowDeselect={false}
                           control={control}
                           size="xs"
                           className="w-22"
                        />
                     </>
                  ) : (
                     <>
                        <span className="text-xs text-primary/50 leading-none">Required</span>
                        <MantineSwitch
                           size="sm"
                           disabled={readonly}
                           name={`${prefix}.config.required`}
                           control={control}
                        />
                     </>
                  )}
               </div>
            </div>
            <div className="flex items-end">
               <div className="flex flex-row gap-4">
                  <IconButton
                     size="lg"
                     Icon={TbSettings}
                     disabled={is_primary}
                     iconProps={{ strokeWidth: 1.5 }}
                     onClick={() => toggle()}
                     variant={active ? "primary" : "ghost"}
                  />
               </div>
            </div>
         </div>
         {active && (
            <div className="flex flex-col border-t border-t-muted px-3 py-2 bg-lightest/50">
               {/*<pre>{JSON.stringify(field, null, 2)}</pre>*/}
               <Tabs defaultValue="general">
                  <Tabs.List className="flex flex-row">
                     <Tabs.Tab value="general">General</Tabs.Tab>
                     <Tabs.Tab value="specific">{ucFirstAllSnakeToPascalWithSpaces(type)}</Tabs.Tab>
                     <Tabs.Tab value="visibility" disabled>
                        Visiblity
                     </Tabs.Tab>
                     <div className="flex flex-grow" />
                     <Tabs.Tab value="code" className="!self-end">
                        Code
                     </Tabs.Tab>
                  </Tabs.List>
                  <Tabs.Panel value="general">
                     <div className="flex flex-col gap-2 pt-3 pb-1" key={`${prefix}_${type}`}>
                        <div className="flex flex-row">
                           <MantineSwitch
                              label="Required"
                              disabled={readonly}
                              name={`${prefix}.config.required`}
                              control={control}
                           />
                        </div>
                        <TextInput
                           label="Label"
                           placeholder="Label"
                           disabled={readonly}
                           {...register(`${prefix}.config.label`)}
                        />
                        <Textarea
                           label="Description"
                           placeholder="Description"
                           disabled={readonly}
                           {...register(`${prefix}.config.description`)}
                        />
                        {!hidden.includes("virtual") && (
                           <MantineSwitch
                              label="Virtual"
                              name={`${prefix}.config.virtual`}
                              control={control}
                              disabled={disabled.includes("virtual") || readonly}
                           />
                        )}
                     </div>
                  </Tabs.Panel>
                  <Tabs.Panel value="specific">
                     <div className="flex flex-col gap-2 pt-3 pb-1">
                        <ErrorBoundary fallback={`Error rendering JSON Schema for ${type}`}>
                           <SpecificForm
                              field={field}
                              onChange={(value) => {
                                 setValue(`${prefix}.config`, {
                                    ...getValues([`fields.${index}.config`])[0],
                                    ...value,
                                 });
                              }}
                              readonly={readonly}
                           />
                        </ErrorBoundary>
                     </div>
                  </Tabs.Panel>
                  <Tabs.Panel value="code">
                     {(() => {
                        const { id, ...json } = field;
                        return <JsonViewer json={json} expand={4} />;
                     })()}
                  </Tabs.Panel>
                  {!readonly && (
                     <div className="flex flex-row justify-end">
                        <Button
                           IconLeft={TbTrash}
                           onClick={handleDelete(index)}
                           size="small"
                           variant="subtlered"
                        >
                           Delete
                        </Button>
                     </div>
                  )}
               </Tabs>
            </div>
         )}
      </div>
   );
}

const SpecificForm = ({
   field,
   onChange,
   readonly,
}: {
   field: FieldArrayWithId<TFieldsFormSchema, "fields", "id">;
   onChange: (value: any) => void;
   readonly?: boolean;
}) => {
   const type = field.field.type;
   const specificData = omit(field.field.config, commonProps);

   return (
      <JsonSchemaForm
         key={type}
         schema={specificFieldSchema(type as any)?.toJSON()}
         formData={specificData}
         uiSchema={dataFieldsUiSchema.config}
         className="legacy hide-required-mark fieldset-alternative mute-root"
         onChange={onChange}
         readonly={readonly}
      />
   );
};