// Package openapi ...
//
// Description : openapi ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2026-01-05 17:20
package openapi

import (
	"fmt"
	"net/http"
	"reflect"
	"strings"

	"git.zhangdeman.cn/zhangdeman/api-doc/define"
	"git.zhangdeman.cn/zhangdeman/consts"
	"git.zhangdeman.cn/zhangdeman/wrapper/op_array"
	"github.com/getkin/kin-openapi/openapi3"
)

// NewGenerate 生成文档实例
func NewGenerate() *Generate {
	return &Generate{
		doc: &openapi3.T{
			Extensions: map[string]any{},
			OpenAPI:    "3.1.0",
			Components: &openapi3.Components{
				Extensions: map[string]any{},
				Origin: &openapi3.Origin{
					Key: &openapi3.Location{
						Line:   0,
						Column: 0,
					},
					Fields: make(map[string]openapi3.Location),
				},
				Schemas:         map[string]*openapi3.SchemaRef{},
				Parameters:      map[string]*openapi3.ParameterRef{},
				Headers:         map[string]*openapi3.HeaderRef{},
				RequestBodies:   map[string]*openapi3.RequestBodyRef{},
				Responses:       map[string]*openapi3.ResponseRef{},
				SecuritySchemes: map[string]*openapi3.SecuritySchemeRef{},
				Examples:        map[string]*openapi3.ExampleRef{},
				Links:           map[string]*openapi3.LinkRef{},
				Callbacks:       map[string]*openapi3.CallbackRef{},
			},
			Info: &openapi3.Info{
				Extensions: map[string]any{},
				Origin: &openapi3.Origin{
					Key: &openapi3.Location{
						Line:   0,
						Column: 0,
					},
					Fields: make(map[string]openapi3.Location),
				},
				Title:          "服务 API接口 文档",
				Description:    "服务 API接口 文档",
				TermsOfService: "",
				Contact: &openapi3.Contact{
					Extensions: map[string]any{},
					Origin: &openapi3.Origin{
						Key: &openapi3.Location{
							Line:   0,
							Column: 0,
						},
						Fields: make(map[string]openapi3.Location),
					},
					Name:  "developer",
					URL:   "",
					Email: "developer@test.com",
				},
				License: &openapi3.License{
					Extensions: map[string]any{},
					Origin: &openapi3.Origin{
						Key: &openapi3.Location{
							Line:   0,
							Column: 0,
						},
						Fields: make(map[string]openapi3.Location),
					},
					Name: consts.LicenseApache20,
					URL:  consts.LicenseUrlTable[consts.LicenseApache20],
				},
				Version: "0.0.1",
			},
			Paths: &openapi3.Paths{
				Extensions: map[string]any{},
				Origin: &openapi3.Origin{
					Key: &openapi3.Location{
						Line:   0,
						Column: 0,
					},
					Fields: make(map[string]openapi3.Location),
				},
			},
			Security: []openapi3.SecurityRequirement{},
			Servers: []*openapi3.Server{
				{
					Extensions:  nil,
					Origin:      nil,
					URL:         "http://127.0.0.1:8080/v1",
					Description: "开发环境",
					Variables:   nil,
				},
			},
			Tags: []*openapi3.Tag{},
			/*ExternalDocs: &openapi3.ExternalDocs{
				Extensions:  map[string]any{},
				Origin:      nil,
				Description: "",
				URL:         "",
			},*/
		},
	}
}

// Generate 生成 OpenApi 标准规范的文档
type Generate struct {
	doc *openapi3.T
}

// AddApiDoc 添加接口文档
func (g *Generate) AddApiDoc(apiMeta define.UriConfig, request any, response any) error {
	var (
		err          error
		requestType  reflect.Type
		responseType reflect.Type
		ok           bool
	)

	// 初始化请求数据与响应数据类型
	if requestType, ok = request.(reflect.Type); !ok {
		requestType = reflect.TypeOf(request)
		if requestType.Kind() == reflect.Ptr {
			requestType = requestType.Elem()
		}
	}

	if responseType, ok = response.(reflect.Type); !ok {
		responseType = reflect.TypeOf(response)
		if responseType.Kind() == reflect.Ptr {
			responseType = responseType.Elem()
		}
	}

	schemaData := GenerateOpenAPISchema(requestType)
	apiOperate, isRead := g.initApiConfig(apiMeta)
	requestTypeStr := requestType.String()
	if isRead {
		for paramName, paramConfig := range schemaData.Value.Properties {
			apiOperate.Parameters = append(apiOperate.Parameters, &openapi3.ParameterRef{
				Extensions: nil,
				Origin:     nil,
				Ref:        "",
				Value: &openapi3.Parameter{
					Extensions:      nil,
					Origin:          nil,
					Name:            paramName,
					In:              strings.ToLower(consts.RequestDataLocationQuery.String()),
					Description:     paramConfig.Value.Description,
					Style:           "",
					Explode:         nil,
					AllowEmptyValue: paramConfig.Value.AllowEmptyValue,
					AllowReserved:   false,
					Deprecated:      false,
					Required:        op_array.ArrayType(paramConfig.Value.Required).Has(paramName) >= 0,
					Schema:          paramConfig,
					Example:         nil,
					Examples:        nil,
					Content:         nil,
				},
			})
		}
	} else {
		apiOperate.RequestBody = &openapi3.RequestBodyRef{
			Extensions: nil,
			Origin:     nil,
			Ref:        "",
			Value: &openapi3.RequestBody{
				Extensions:  nil,
				Origin:      nil,
				Description: "",
				Required:    false,
				Content: map[string]*openapi3.MediaType{
					consts.MimeTypeJson: {
						Extensions: nil,
						Origin:     nil,
						Schema:     schemaData,
						Example:    nil,
						Examples:   nil,
						Encoding:   nil,
					},
				},
			},
		}
	}

	// 初始化接口配置
	if _, exist := g.doc.Components.Schemas[requestTypeStr]; !exist {
		g.doc.Components.Schemas[requestTypeStr] = schemaData
	}
	responseTypeStr := responseType.String()
	if _, exist := g.doc.Components.Schemas[responseTypeStr]; !exist {
		g.doc.Components.Schemas[responseTypeStr] = GenerateOpenAPISchema(responseType)
	}
	desc := "请求成功"
	apiOperate.Responses.Set(fmt.Sprintf("%v", http.StatusOK), &openapi3.ResponseRef{
		Extensions: nil,
		Origin:     nil,
		Ref:        "",
		Value: &openapi3.Response{
			Extensions:  nil,
			Origin:      nil,
			Description: &desc,
			Headers:     nil,
			Content: map[string]*openapi3.MediaType{
				consts.MimeTypeJson: {
					Extensions: nil,
					Origin:     nil,
					Schema:     g.doc.Components.Schemas[responseTypeStr],
					Example:    nil,
					Examples:   nil,
					Encoding:   nil,
				},
			},
			Links: nil,
		},
	})
	return err
}

// initApiConfig 初始化接口配置, 并返回 operation 以及 是否读请求
func (g *Generate) initApiConfig(apiMeta define.UriConfig) (*openapi3.Operation, bool) {
	if nil == g.doc.Paths.Value(apiMeta.Path) {
		g.doc.Paths.Set(apiMeta.Path, &openapi3.PathItem{
			Extensions:  nil,
			Origin:      nil,
			Ref:         "",
			Summary:     apiMeta.Desc,
			Description: apiMeta.Desc,
			Connect:     nil,
			Delete:      nil,
			Get:         nil,
			Head:        nil,
			Options:     nil,
			Patch:       nil,
			Post:        nil,
			Put:         nil,
			Trace:       nil,
			Servers:     nil,
			Parameters:  nil,
		})
	}
	newOperate := openapi3.NewOperation()
	newOperate.Parameters = make(openapi3.Parameters, 0)
	newOperate.Responses = openapi3.NewResponses()
	newOperate.Summary = apiMeta.Desc
	newOperate.Description = apiMeta.Desc
	newOperate.Tags = apiMeta.TagList
	newOperate.OperationID = fmt.Sprintf("%v_%v", apiMeta.RequestMethod, apiMeta.Path)
	isRead := false
	switch apiMeta.RequestMethod {
	case http.MethodGet:
		g.doc.Paths.Value(apiMeta.Path).Get = newOperate
		isRead = true
	case http.MethodHead:
		g.doc.Paths.Value(apiMeta.Path).Head = newOperate
		isRead = true
	case http.MethodConnect:
		g.doc.Paths.Value(apiMeta.Path).Connect = newOperate
		isRead = true
	case http.MethodOptions:
		g.doc.Paths.Value(apiMeta.Path).Options = newOperate
		isRead = true
	case http.MethodTrace:
		g.doc.Paths.Value(apiMeta.Path).Trace = newOperate
		isRead = true
		// 读请求
	case http.MethodPost:
		g.doc.Paths.Value(apiMeta.Path).Post = newOperate
	case http.MethodPut:
		g.doc.Paths.Value(apiMeta.Path).Put = newOperate
	case http.MethodPatch:
		g.doc.Paths.Value(apiMeta.Path).Patch = newOperate
	case http.MethodDelete:
		g.doc.Paths.Value(apiMeta.Path).Delete = newOperate
		// 写请求
	}
	return newOperate, isRead
}