/*
 * 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 selector

import (
	"context"
	"fmt"
	"strconv"
	"strings"

	"github.com/coze-dev/coze-studio/backend/domain/workflow/entity/vo"
	"github.com/coze-dev/coze-studio/backend/domain/workflow/internal/nodes"
)

type selectorCallbackField struct {
	Key   string      `json:"key"`
	Type  vo.DataType `json:"type"`
	Value any         `json:"value"`
}

type selectorCondition struct {
	Left     selectorCallbackField  `json:"left"`
	Operator vo.OperatorType        `json:"operator"`
	Right    *selectorCallbackField `json:"right,omitempty"`
}

type selectorBranch struct {
	Conditions []*selectorCondition `json:"conditions"`
	Logic      vo.LogicType         `json:"logic"`
	Name       string               `json:"name"`
}

func (s *Selector) ToCallbackInput(_ context.Context, in map[string]any) (map[string]any, error) {
	count := len(s.clauses)

	output := make([]*selectorBranch, count)

	for _, source := range s.ns.InputSources {
		targetPath := source.Path
		if len(targetPath) == 2 {
			indexStr := targetPath[0]
			index, err := strconv.Atoi(indexStr)
			if err != nil {
				return nil, err
			}

			branch := output[index]
			if branch == nil {
				output[index] = &selectorBranch{
					Conditions: []*selectorCondition{
						{
							Operator: s.clauses[index].Single.ToCanvasOperatorType(),
						},
					},
					Logic: ClauseRelationAND.ToVOLogicType(),
				}
			}

			if targetPath[1] == LeftKey {
				leftV, ok := nodes.TakeMapValue(in, targetPath)
				if !ok {
					return nil, fmt.Errorf("failed to take left value of %s", targetPath)
				}
				if source.Source.Ref.VariableType != nil {
					if *source.Source.Ref.VariableType == vo.ParentIntermediate {
						parentNodeKey, ok := s.ws.Hierarchy[s.ns.Key]
						if !ok {
							return nil, fmt.Errorf("failed to find parent node key of %s", s.ns.Key)
						}
						parentNode := s.ws.GetNode(parentNodeKey)
						output[index].Conditions[0].Left = selectorCallbackField{
							Key:   parentNode.Name + "." + strings.Join(source.Source.Ref.FromPath, "."),
							Type:  s.ns.InputTypes[targetPath[0]].Properties[targetPath[1]].Type,
							Value: leftV,
						}
					} else {
						output[index].Conditions[0].Left = selectorCallbackField{
							Key:   "",
							Type:  s.ns.InputTypes[targetPath[0]].Properties[targetPath[1]].Type,
							Value: leftV,
						}
					}
				} else {
					output[index].Conditions[0].Left = selectorCallbackField{
						Key:   s.ws.GetNode(source.Source.Ref.FromNodeKey).Name + "." + strings.Join(source.Source.Ref.FromPath, "."),
						Type:  s.ns.InputTypes[targetPath[0]].Properties[targetPath[1]].Type,
						Value: leftV,
					}
				}
			} else if targetPath[1] == RightKey {
				rightV, ok := nodes.TakeMapValue(in, targetPath)
				if !ok {
					return nil, fmt.Errorf("failed to take right value of %s", targetPath)
				}
				output[index].Conditions[0].Right = &selectorCallbackField{
					Type:  s.ns.InputTypes[targetPath[0]].Properties[targetPath[1]].Type,
					Value: rightV,
				}
			}
		} else if len(targetPath) == 3 {
			indexStr := targetPath[0]
			index, err := strconv.Atoi(indexStr)
			if err != nil {
				return nil, err
			}

			multi := s.clauses[index].Multi

			branch := output[index]
			if branch == nil {
				output[index] = &selectorBranch{
					Conditions: make([]*selectorCondition, len(multi.Clauses)),
					Logic:      multi.Relation.ToVOLogicType(),
				}
			}

			clauseIndexStr := targetPath[1]
			clauseIndex, err := strconv.Atoi(clauseIndexStr)
			if err != nil {
				return nil, err
			}

			clause := multi.Clauses[clauseIndex]

			if output[index].Conditions[clauseIndex] == nil {
				output[index].Conditions[clauseIndex] = &selectorCondition{
					Operator: clause.ToCanvasOperatorType(),
				}
			}

			if targetPath[2] == LeftKey {
				leftV, ok := nodes.TakeMapValue(in, targetPath)
				if !ok {
					return nil, fmt.Errorf("failed to take left value of %s", targetPath)
				}
				if source.Source.Ref.VariableType != nil {
					if *source.Source.Ref.VariableType == vo.ParentIntermediate {
						parentNodeKey, ok := s.ws.Hierarchy[s.ns.Key]
						if !ok {
							return nil, fmt.Errorf("failed to find parent node key of %s", s.ns.Key)
						}
						parentNode := s.ws.GetNode(parentNodeKey)
						output[index].Conditions[clauseIndex].Left = selectorCallbackField{
							Key:   parentNode.Name + "." + strings.Join(source.Source.Ref.FromPath, "."),
							Type:  s.ns.InputTypes[targetPath[0]].Properties[targetPath[1]].Properties[targetPath[2]].Type,
							Value: leftV,
						}
					} else {
						output[index].Conditions[clauseIndex].Left = selectorCallbackField{
							Key:   "",
							Type:  s.ns.InputTypes[targetPath[0]].Properties[targetPath[1]].Properties[targetPath[2]].Type,
							Value: leftV,
						}
					}
				} else {
					output[index].Conditions[clauseIndex].Left = selectorCallbackField{
						Key:   s.ws.GetNode(source.Source.Ref.FromNodeKey).Name + "." + strings.Join(source.Source.Ref.FromPath, "."),
						Type:  s.ns.InputTypes[targetPath[0]].Properties[targetPath[1]].Properties[targetPath[2]].Type,
						Value: leftV,
					}
				}
			} else if targetPath[2] == RightKey {
				rightV, ok := nodes.TakeMapValue(in, targetPath)
				if !ok {
					return nil, fmt.Errorf("failed to take right value of %s", targetPath)
				}
				output[index].Conditions[clauseIndex].Right = &selectorCallbackField{
					Type:  s.ns.InputTypes[targetPath[0]].Properties[targetPath[1]].Properties[targetPath[2]].Type,
					Value: rightV,
				}
			}
		}
	}

	return map[string]any{"branches": output}, nil
}