// Package distributionwithdrawal 提供分销注册、提现资格与提现审批的只读投影查询。
// 查询不得修改任何状态；可见性由调用方在业务边界先行校验。
package distributionwithdrawal

import (
	"context"
	"encoding/json"

	"gorm.io/gorm"

	distributiondomain "github.com/break/junhong_cmp_fiber/internal/domain/distribution"
	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/internal/model/dto"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// Query 提供提现资料资格与提现申请详情的只读投影。
type Query struct {
	db *gorm.DB
}

// NewQuery 创建分销与提现审批只读查询。
func NewQuery(db *gorm.DB) *Query {
	return &Query{db: db}
}

// ListQualifications 按数据范围分页查询提现资料资格版本，证件号按脱敏值返回。
func (q *Query) ListQualifications(
	ctx context.Context,
	shopIDs []uint,
	req *dto.WithdrawalQualificationListReq,
) (*dto.WithdrawalQualificationPageResult, error) {
	if q == nil || q.db == nil {
		return nil, errors.New(errors.CodeInternalError, "提现资料资格查询能力未配置")
	}
	page := req.Page
	if page <= 0 {
		page = constants.DefaultPage
	}
	pageSize := req.PageSize
	if pageSize <= 0 {
		pageSize = constants.DefaultPageSize
	}
	if pageSize > constants.MaxPageSize {
		pageSize = constants.MaxPageSize
	}
	query := q.db.WithContext(ctx).Model(&model.WithdrawalQualification{})
	if len(shopIDs) == 1 {
		query = query.Where("shop_id = ?", shopIDs[0])
	} else if len(shopIDs) > 1 {
		query = query.Where("shop_id IN ?", shopIDs)
	}
	if req.Status != nil {
		query = query.Where("status = ?", *req.Status)
	}
	var total int64
	if err := query.Count(&total).Error; err != nil {
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "统计提现资料资格失败")
	}
	var versions []model.WithdrawalQualification
	if err := query.Order("id DESC").Offset((page - 1) * pageSize).Limit(pageSize).
		Find(&versions).Error; err != nil {
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "查询提现资料资格失败")
	}
	shopNames, err := q.shopNames(ctx, versions)
	if err != nil {
		return nil, err
	}
	instanceStatuses, err := q.approvalStatuses(ctx, constants.ApprovalBusinessTypeWithdrawalQualification, instanceIDsOfQualifications(versions))
	if err != nil {
		return nil, err
	}
	items := make([]dto.WithdrawalQualificationItem, 0, len(versions))
	for index := range versions {
		version := &versions[index]
		instanceID := uint(0)
		if version.ApprovalInstanceID != nil {
			instanceID = *version.ApprovalInstanceID
		}
		item := dto.WithdrawalQualificationItem{
			ID: version.ID, ShopID: version.ShopID, ShopName: shopNames[version.ShopID],
			SubjectType:            version.SubjectType,
			SubjectTypeName:        constants.GetWithdrawalQualificationSubjectTypeName(version.SubjectType),
			SubjectCodeMasked:      distributiondomain.MaskSubjectCode(version.SubjectCode),
			LegalPersonIDCardMask:  distributiondomain.MaskSubjectCode(version.LegalPersonIDCard),
			ContractFileKey:        version.ContractFileKey,
			IDCardFrontFileKey:     version.IDCardFrontFileKey,
			IDCardBackFileKey:      version.IDCardBackFileKey,
			BusinessLicenseFileKey: version.BusinessLicenseFileKey,
			ShopFrontFileKey:       version.ShopFrontFileKey,
			InvoiceFileKey:         version.InvoiceFileKey, InvoiceTitle: version.InvoiceTitle,
			Status: version.Status, StatusName: constants.GetWithdrawalQualificationStatusName(version.Status),
			InvalidReason: version.InvalidReason, ApprovalInstanceID: instanceID,
			CreatedAt: version.CreatedAt.Format("2006-01-02 15:04:05"),
			UpdatedAt: version.UpdatedAt.Format("2006-01-02 15:04:05"),
		}
		if version.InvalidatedAt != nil {
			item.InvalidatedAt = version.InvalidatedAt.Format("2006-01-02 15:04:05")
		}
		if status, ok := instanceStatuses[instanceID]; ok {
			item.ApprovalStatus = status
			item.ApprovalStatusName = constants.GetApprovalStatusName(status)
		} else {
			item.ApprovalStatusName = constants.GetApprovalStatusName(-1)
		}
		items = append(items, item)
	}
	return &dto.WithdrawalQualificationPageResult{
		Items: items, Total: total, Page: page, Size: pageSize,
	}, nil
}

// WithdrawalDetail 查询单笔提现申请详情与其全部审批尝试记录。
func (q *Query) WithdrawalDetail(
	ctx context.Context,
	requestID uint,
) (*dto.ShopWithdrawalRequestDetailResp, error) {
	if q == nil || q.db == nil {
		return nil, errors.New(errors.CodeInternalError, "提现详情查询能力未配置")
	}
	var request model.CommissionWithdrawalRequest
	if err := q.db.WithContext(ctx).First(&request, requestID).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, errors.New(errors.CodeNotFound, "提现申请不存在")
		}
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "查询提现申请失败")
	}
	var attempts []model.CommissionWithdrawalRequestAttempt
	if err := q.db.WithContext(ctx).
		Where("request_id = ?", request.ID).Order("attempt_no DESC").Find(&attempts).Error; err != nil {
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "查询提现审批尝试记录失败")
	}
	instanceStatuses, err := q.approvalStatuses(ctx, constants.ApprovalBusinessTypeCommissionWithdrawal, instanceIDsOfAttempts(attempts))
	if err != nil {
		return nil, err
	}
	shopNames, err := q.shopNames(ctx, []model.WithdrawalQualification{{ShopID: request.ShopID}})
	if err != nil {
		return nil, err
	}
	accountName, accountNumber := decodeAttemptAccount(request.AccountInfo)
	processedAt := ""
	if request.ProcessedAt != nil {
		processedAt = request.ProcessedAt.Format("2006-01-02 15:04:05")
	}
	paidAt := ""
	if request.PaidAt != nil {
		paidAt = request.PaidAt.Format("2006-01-02 15:04:05")
	}
	detail := &dto.ShopWithdrawalRequestDetailResp{
		ShopWithdrawalRequestItem: dto.ShopWithdrawalRequestItem{
			ID: request.ID, WithdrawalNo: request.WithdrawalNo, Amount: request.Amount,
			FeeRate: request.FeeRate, Fee: request.Fee, ActualAmount: request.ActualAmount,
			Status: request.Status, StatusName: constants.GetWithdrawalStatusName(request.Status),
			ShopID: request.ShopID, ShopName: shopNames[request.ShopID],
			ApplicantID: request.ApplicantID, WithdrawalMethod: request.WithdrawalMethod,
			PaymentType: request.PaymentType, AccountName: accountName, AccountNumber: accountNumber,
			RejectReason: request.RejectReason, Remark: request.Remark,
			CreatedAt:   request.CreatedAt.Format("2006-01-02 15:04:05"),
			ProcessedAt: processedAt, PaidAt: paidAt,
		},
		LatestAttemptID:          request.LatestAttemptID,
		LatestApprovalInstanceID: request.LatestApprovalInstanceID,
		AnomalyFlag:              request.AnomalyFlag,
		AnomalyName:              constants.GetWithdrawalAnomalyName(request.AnomalyFlag),
		AnomalyReason:            request.AnomalyReason,
		Attempts:                 make([]dto.WithdrawalRequestAttemptItem, 0, len(attempts)),
	}
	if request.ApprovalInstanceID != nil {
		detail.ApprovalInstanceID = *request.ApprovalInstanceID
	}
	for index := range attempts {
		attempt := &attempts[index]
		instanceID := uint(0)
		if attempt.ApprovalInstanceID != nil {
			instanceID = *attempt.ApprovalInstanceID
		}
		item := dto.WithdrawalRequestAttemptItem{
			ID: attempt.ID, AttemptNo: attempt.AttemptNo, Amount: attempt.Amount,
			Fee: attempt.Fee, FeeRate: attempt.FeeRate, ActualAmount: attempt.ActualAmount,
			WithdrawalMethod: attempt.WithdrawalMethod, SubmittedByID: attempt.SubmittedByAccountID,
			ApprovalInstanceID: instanceID,
			CreatedAt:          attempt.CreatedAt.Format("2006-01-02 15:04:05"),
		}
		if status, ok := instanceStatuses[instanceID]; ok {
			item.ApprovalStatus = status
			item.ApprovalStatusName = constants.GetApprovalStatusName(status)
		} else {
			item.ApprovalStatusName = constants.GetApprovalStatusName(-1)
		}
		if attempt.ReleasedAt != nil {
			item.ReleasedAt = attempt.ReleasedAt.Format("2006-01-02 15:04:05")
		}
		detail.Attempts = append(detail.Attempts, item)
	}
	return detail, nil
}

// shopNames 批量读取店铺名称，缺失店铺留空。
func (q *Query) shopNames(ctx context.Context, versions []model.WithdrawalQualification) (map[uint]string, error) {
	shopIDs := make([]uint, 0, len(versions))
	seen := make(map[uint]struct{}, len(versions))
	for _, version := range versions {
		if version.ShopID == 0 {
			continue
		}
		if _, exists := seen[version.ShopID]; exists {
			continue
		}
		seen[version.ShopID] = struct{}{}
		shopIDs = append(shopIDs, version.ShopID)
	}
	names := make(map[uint]string, len(shopIDs))
	if len(shopIDs) == 0 {
		return names, nil
	}
	var shops []model.Shop
	if err := q.db.WithContext(ctx).Select("id", "shop_name").Where("id IN ?", shopIDs).Find(&shops).Error; err != nil {
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "查询店铺名称失败")
	}
	for _, shop := range shops {
		names[shop.ID] = shop.ShopName
	}
	return names, nil
}

// approvalStatuses 批量读取通用审批实例状态，缺失实例不进入结果。
func (q *Query) approvalStatuses(
	ctx context.Context,
	businessType string,
	instanceIDs []uint,
) (map[uint]int, error) {
	statuses := make(map[uint]int, len(instanceIDs))
	if len(instanceIDs) == 0 {
		return statuses, nil
	}
	var instances []model.ApprovalInstance
	if err := q.db.WithContext(ctx).Select("id", "status").
		Where("business_type = ? AND id IN ?", businessType, instanceIDs).
		Find(&instances).Error; err != nil {
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "查询通用审批实例状态失败")
	}
	for _, instance := range instances {
		statuses[instance.ID] = instance.Status
	}
	return statuses, nil
}

// instanceIDsOfQualifications 提取资料版本关联的审批实例 ID。
func instanceIDsOfQualifications(versions []model.WithdrawalQualification) []uint {
	ids := make([]uint, 0, len(versions))
	for index := range versions {
		if versions[index].ApprovalInstanceID != nil {
			ids = append(ids, *versions[index].ApprovalInstanceID)
		}
	}
	return ids
}

// instanceIDsOfAttempts 提取提现审批尝试关联的审批实例 ID。
func instanceIDsOfAttempts(attempts []model.CommissionWithdrawalRequestAttempt) []uint {
	ids := make([]uint, 0, len(attempts))
	for index := range attempts {
		if attempts[index].ApprovalInstanceID != nil {
			ids = append(ids, *attempts[index].ApprovalInstanceID)
		}
	}
	return ids
}

// decodeAttemptAccount 解析收款账户快照，解析失败时留空。
func decodeAttemptAccount(payload []byte) (string, string) {
	var info map[string]string
	if err := json.Unmarshal(payload, &info); err != nil {
		return "", ""
	}
	return info["account_name"], info["account_number"]
}