/*
 * Copyright 2025 coze-dev Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package receiver

import (
	"context"
	"errors"
	"fmt"

	"github.com/bytedance/sonic"
	"github.com/cloudwego/eino/compose"

	"github.com/coze-dev/coze-studio/backend/domain/workflow"
	"github.com/coze-dev/coze-studio/backend/domain/workflow/entity"
	"github.com/coze-dev/coze-studio/backend/domain/workflow/entity/vo"
	"github.com/coze-dev/coze-studio/backend/domain/workflow/internal/execute"
	"github.com/coze-dev/coze-studio/backend/domain/workflow/internal/nodes"
	"github.com/coze-dev/coze-studio/backend/pkg/ctxcache"
	"github.com/coze-dev/coze-studio/backend/pkg/errorx"
	"github.com/coze-dev/coze-studio/backend/pkg/logs"
	sonic2 "github.com/coze-dev/coze-studio/backend/pkg/sonic"
	"github.com/coze-dev/coze-studio/backend/types/errno"
)

type Config struct {
	OutputTypes  map[string]*vo.TypeInfo
	NodeKey      vo.NodeKey
	OutputSchema string
}

type InputReceiver struct {
	outputTypes   map[string]*vo.TypeInfo
	interruptData string
	nodeKey       vo.NodeKey
	nodeMeta      entity.NodeTypeMeta
}

func New(_ context.Context, cfg *Config) (*InputReceiver, error) {
	nodeMeta := entity.NodeMetaByNodeType(entity.NodeTypeInputReceiver)
	if nodeMeta == nil {
		return nil, errors.New("node meta not found for input receiver")
	}

	interruptData := map[string]string{
		"content_type": "form_schema",
		"content":      cfg.OutputSchema,
	}

	interruptDataStr, err := sonic.ConfigStd.MarshalToString(interruptData) // keep the order of the keys
	if err != nil {
		return nil, err
	}

	return &InputReceiver{
		outputTypes:   cfg.OutputTypes,
		nodeMeta:      *nodeMeta,
		nodeKey:       cfg.NodeKey,
		interruptData: interruptDataStr,
	}, nil
}

const (
	ReceivedDataKey    = "$received_data"
	receiverWarningKey = "receiver_warning_%d_%s"
)

func (i *InputReceiver) Invoke(ctx context.Context, in map[string]any) (map[string]any, error) {
	var input string
	if in != nil {
		receivedData, ok := in[ReceivedDataKey]
		if ok {
			input = receivedData.(string)
		}
	}

	if len(input) == 0 {
		err := compose.ProcessState(ctx, func(ctx context.Context, ieStore nodes.InterruptEventStore) error {
			_, found, e := ieStore.GetInterruptEvent(i.nodeKey) // TODO: try not use InterruptEventStore or state in general
			if e != nil {
				return e
			}

			if !found { // only generate a new event if it doesn't exist
				eventID, err := workflow.GetRepository().GenID(ctx)
				if err != nil {
					return err
				}
				return ieStore.SetInterruptEvent(i.nodeKey, &entity.InterruptEvent{
					ID:            eventID,
					NodeKey:       i.nodeKey,
					NodeType:      entity.NodeTypeInputReceiver,
					NodeTitle:     i.nodeMeta.Name,
					NodeIcon:      i.nodeMeta.IconURL,
					InterruptData: i.interruptData,
					EventType:     entity.InterruptEventInput,
				})
			}

			return nil
		})
		if err != nil {
			return nil, err
		}
		return nil, compose.InterruptAndRerun
	}

	out, err := jsonParseRelaxed(ctx, input, i.outputTypes)
	if err != nil {
		return nil, err
	}

	return out, nil
}

func jsonParseRelaxed(ctx context.Context, data string, schema_ map[string]*vo.TypeInfo) (map[string]any, error) {
	var result map[string]any

	err := sonic2.UnmarshalString(data, &result)
	if err != nil {
		return nil, err
	}

	r, ws, err := nodes.ConvertInputs(ctx, result, schema_, nodes.SkipUnknownFields())
	if err != nil {
		return nil, err
	}
	if ws != nil && len(*ws) > 0 {
		logs.CtxWarnf(ctx, "convert inputs warnings: %v", *ws)
		var (
			executeID int64
			nodeKey   vo.NodeKey
		)
		if c := execute.GetExeCtx(ctx); c != nil {
			executeID = c.RootExecuteID
			nodeKey = c.NodeKey
		}

		warningKey := fmt.Sprintf(receiverWarningKey, executeID, nodeKey)
		ctxcache.Store(ctx, warningKey, *ws)
	}

	return r, nil
}

func (i *InputReceiver) ToCallbackOutput(ctx context.Context, output map[string]any) (
	*nodes.StructuredCallbackOutput, error) {
	var (
		executeID int64
		nodeKey   vo.NodeKey
	)
	if c := execute.GetExeCtx(ctx); c != nil {
		executeID = c.RootExecuteID
		nodeKey = c.NodeKey
	}

	warningKey := fmt.Sprintf(receiverWarningKey, executeID, nodeKey)

	var wfe vo.WorkflowError
	if warnings, ok := ctxcache.Get[nodes.ConversionWarnings](ctx, warningKey); ok {
		wfe = vo.WrapWarn(errno.ErrNodeOutputParseFail, warnings, errorx.KV("warnings", warnings.Error()))
	}
	return &nodes.StructuredCallbackOutput{
		Output:    output,
		RawOutput: output,
		Error:     wfe,
	}, nil
}