package qiyuesuosdk

import (
	"encoding/base64"
	"errors"
	"strconv"
	"strings"

	v2seal_request "git.sxidc.com/student-physical-examination/contract_lock_sdk/model/v2seal/request"
	v2seal_response "git.sxidc.com/student-physical-examination/contract_lock_sdk/model/v2seal/response"
	"git.sxidc.com/student-physical-examination/contract_lock_sdk/model/common"
)

// DeriveCompanySealName 根据机构名称推导契约锁公章名称（与制章/授权逻辑一致）。
func DeriveCompanySealName(companyDisplayName string) string {
	sealName := strings.TrimSpace(companyDisplayName)
	if sealName == "" {
		return "机构公章"
	}
	if !strings.Contains(sealName, "章") {
		sealName += "公章"
	}
	return sealName
}

// CompanySealImage 下载机构电子公章图片（PNG）。
func (c *Client) CompanySealImage(company CompanyLocateParams, sealName string) ([]byte, string, error) {
	sealName = strings.TrimSpace(sealName)
	if sealName == "" {
		return nil, "", ErrInvalidParams
	}
	body := map[string]any{
		"sealName":      sealName,
		"sealAttribute": "ELECTRONIC",
		"sealImageFormatRequest": map[string]any{
			"imageFormat": "png",
		},
	}
	if company.ID != "" {
		body["companyId"] = company.ID
	}
	if company.Name != "" {
		body["companyName"] = company.Name
	}
	if company.RegisterNo != "" {
		body["registerNo"] = company.RegisterNo
	}
	data, contentType, err := c.postForImageBytes("/seal/customparam/image", body)
	if err != nil {
		return nil, "", err
	}
	if len(data) == 0 {
		return nil, "", ErrSealImageUnavailable
	}
	return data, contentType, nil
}

// CompanySealImageBase64 下载机构公章并返回标准 Base64（不含 data: 前缀）。
func (c *Client) CompanySealImageBase64(company CompanyLocateParams, sealName string) (string, string, error) {
	data, contentType, err := c.CompanySealImage(company, sealName)
	if err != nil {
		return "", "", err
	}
	return base64.StdEncoding.EncodeToString(data), contentType, nil
}

// CompanySealSummary 法人单位电子印章摘要（来自 /seal/customparam/cert/list）。
type CompanySealSummary struct {
	ID            string
	Name          string
	Type          string
	SealAttribute string
	StatusKey     string
}

type sealCertListItem struct {
	ID            string `json:"id"`
	Name          string `json:"name"`
	Type          string `json:"type"`
	SealAttribute string `json:"sealAttribute"`
	Status        *struct {
		Key string `json:"key"`
	} `json:"status"`
}

type sealCertListResp struct {
	apiResponse
	List []sealCertListItem `json:"list"`
}

// ListCompanyElectronicSeals 查询法人单位下状态正常的电子印章列表。
func (c *Client) ListCompanyElectronicSeals(company CompanyLocateParams) ([]CompanySealSummary, error) {
	companyReq, err := company.toCompanyRequest()
	if err != nil {
		return nil, err
	}
	var resp sealCertListResp
	if err := c.postJSON("/seal/customparam/cert/list", map[string]any{
		"companyRequest":  companyReq,
		"sealAttribute":   "ELECTRONIC",
		"sealQueryStatus": "NORMAL",
	}, &resp); err != nil {
		return nil, err
	}
	if err := resp.err(); err != nil {
		return nil, err
	}
	out := make([]CompanySealSummary, 0, len(resp.List))
	for _, item := range resp.List {
		statusKey := ""
		if item.Status != nil {
			statusKey = item.Status.Key
		}
		if statusKey != "" && statusKey != "NORMAL" {
			continue
		}
		out = append(out, CompanySealSummary{
			ID:            item.ID,
			Name:          item.Name,
			Type:          item.Type,
			SealAttribute: item.SealAttribute,
			StatusKey:     statusKey,
		})
	}
	return out, nil
}

func pickCompanySeal(seals []CompanySealSummary, preferredName string) (*CompanySealSummary, error) {
	if len(seals) == 0 {
		return nil, ErrSealNotFound
	}
	preferredName = strings.TrimSpace(preferredName)
	if preferredName != "" {
		for i := range seals {
			if seals[i].Name == preferredName {
				return &seals[i], nil
			}
		}
	}
	for i := range seals {
		if seals[i].Type == "COMPANY" {
			return &seals[i], nil
		}
	}
	return &seals[0], nil
}

// SealImageByID 按印章 id 下载电子章图片。
func (c *Client) SealImageByID(sealID string) ([]byte, string, error) {
	sealID = strings.TrimSpace(sealID)
	if sealID == "" {
		return nil, "", ErrInvalidParams
	}
	return c.postForImageBytes("/seal/customparam/image", map[string]any{
		"sealId":        sealID,
		"sealAttribute": "ELECTRONIC",
		"sealImageFormatRequest": map[string]any{
			"imageFormat": "png",
		},
	})
}

// ResolveCompanySealImageBase64 先列出法人单位电子章，再按 sealId 拉图（避免印章名不一致）。
func (c *Client) ResolveCompanySealImageBase64(company CompanyLocateParams, preferredSealName string) (string, string, string, error) {
	seals, err := c.ListCompanyElectronicSeals(company)
	if err != nil {
		return "", "", "", err
	}
	seal, err := pickCompanySeal(seals, preferredSealName)
	if err != nil {
		return "", "", "", err
	}
	data, contentType, err := c.SealImageByID(seal.ID)
	if err != nil {
		return "", "", "", err
	}
	if len(data) == 0 {
		return "", "", "", ErrSealImageUnavailable
	}
	return seal.Name, base64.StdEncoding.EncodeToString(data), contentType, nil
}

// CompanySignQualifications 法人单位签章资质（是否已有可用电子章等）。
type CompanySignQualifications struct {
	ElectronicSeal bool `json:"electronicSeal"`
	SM2Cert        bool `json:"sm2Cert"`
	RSACert        bool `json:"rsaCert"`
}

type companySignQualificationsResp struct {
	apiResponse
	Result CompanySignQualifications `json:"result"`
}

type sealCreateResp struct {
	apiResponse
	Result v2seal_response.V2SealCreateResponse `json:"result"`
}

// UserPortalURL 由开放平台 API 地址推导用户前台地址（制章/登录）。
func UserPortalURL(apiAddress string) string {
	addr := strings.TrimRight(apiAddress, "/")
	if strings.Contains(addr, ":9182") {
		return strings.Replace(addr, ":9182", ":9180", 1)
	}
	return addr
}

// CompanySignQualificationsFor 查询法人单位是否具备电子印章等签章资质。
func (c *Client) CompanySignQualificationsFor(company CompanyLocateParams) (*CompanySignQualifications, error) {
	companyReq, err := company.toCompanyRequest()
	if err != nil {
		return nil, err
	}
	var resp companySignQualificationsResp
	if err := c.postJSON("/company/sign/qualifications", map[string]any{
		"companyRequest": companyReq,
	}, &resp); err != nil {
		return nil, err
	}
	if err := resp.err(); err != nil {
		return nil, err
	}
	return &resp.Result, nil
}

// CompanySealCreatePageURL 获取制作电子公章的页面链接（method=page）。
func (c *Client) CompanySealCreatePageURL(company CompanyLocateParams, companyDisplayName, sealName, operatorMobile string) (string, error) {
	if sealName == "" || operatorMobile == "" {
		return "", ErrInvalidParams
	}
	displayName := companyDisplayName
	if displayName == "" {
		displayName = company.Name
	}
	comp := &common.Company{Name: displayName}
	if company.RegisterNo != "" {
		comp.RegisterNo = company.RegisterNo
	}
	if company.ID != "" {
		if id, err := strconv.ParseInt(company.ID, 10, 64); err == nil {
			comp.Id = &id
		}
	}
	modify := true
	req := v2seal_request.V2SealCreateRequest{
		BusinessType:     "ELECTRONIC",
		SealType:         "COMPANY",
		Method:           "page",
		Name:             sealName,
		SealCategoryName: "公章",
		Company:          comp,
		OperatorInfo: &common.UserInfoRequest{
			Mobile: operatorMobile,
		},
		Modify: &modify,
	}
	var resp sealCreateResp
	if err := c.postJSON("/v2/seal/create", req, &resp); err != nil {
		return "", err
	}
	if err := resp.err(); err != nil {
		return "", err
	}
	url := resp.Result.PageUrl
	if url == "" {
		url = resp.Result.LocalPageUrl
	}
	if url == "" {
		return "", ErrSealCreatePageUnavailable
	}
	return url, nil
}

// IsSealNotFoundError 静默授权或查章时「查询的印章不存在」。
func IsSealNotFoundError(err error) bool {
	if err == nil {
		return false
	}
	if errors.Is(err, ErrSealNotFound) {
		return true
	}
	msg := err.Error()
	return strings.Contains(msg, "查询的印章不存在") || strings.Contains(msg, "无可授权的印章")
}