package usecase

import (
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain/entity"
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain/kyc"
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain/repository"
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain/usecase"
	repo "code.30cm.net/digimon/app-cloudep-product-service/pkg/repository"
	"code.30cm.net/digimon/library-go/errs"
	"context"
	"errors"
	"fmt"
	"github.com/zeromicro/go-zero/core/logx"
)

type KYCUseCaseParam struct {
	KYCRepo repository.KYCRepository
}

type KYCUseCase struct {
	KYCUseCaseParam
}

func MustKYCUseCase(param KYCUseCaseParam) usecase.KYCUseCase {
	return &KYCUseCase{
		param,
	}
}

func (use *KYCUseCase) Create(ctx context.Context, data *entity.KYC) error {
	latest, err := use.KYCRepo.FindLatestByUID(ctx, data.UID)

	// 發生真正的錯誤（非找不到）
	if err != nil && !errors.Is(err, repo.ErrNotFound) {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "param", Value: data},
				{Key: "func", Value: "KYCRepo.FindLatestByUID"},
				{Key: "err", Value: err.Error()},
			}, "failed to get latest kyc")
	}

	// 若查到資料，且不是被駁回的，表示已存在審核中/已通過資料 → 禁止再次建立
	if err == nil && latest.Status != kyc.StatusREJECTED {
		return errs.ForbiddenL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "param", Value: data},
				{Key: "func", Value: "KYCRepo.FindLatestByUID"},
				{Key: "reason", Value: "KYC already in progress or approved"},
			}, "不能重複送出 KYC 資料")
	}

	// ✅ 若查不到資料（ErrNotFound），或前一筆是 REJECTED，允許建立
	data.Status = kyc.StatusPending
	err = use.KYCRepo.Create(ctx, data)
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "param", Value: data},
				{Key: "func", Value: "KYCRepo.Create"},
				{Key: "err", Value: err.Error()},
			}, "failed to create kyc review")
	}

	return nil
}

func (use *KYCUseCase) FindLatestByUID(ctx context.Context, uid string) (*entity.KYC, error) {
	latest, err := use.KYCRepo.FindLatestByUID(ctx, uid)
	if err != nil {
		return nil, errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "uid", Value: uid},
				{Key: "func", Value: "KYCRepo.FindLatestByUID"},
				{Key: "err", Value: err.Error()},
			}, "failed to get latest kyc")
	}

	return latest, nil
}

func (use *KYCUseCase) FindByID(ctx context.Context, id string) (*entity.KYC, error) {
	byID, err := use.KYCRepo.FindByID(ctx, id)
	if err != nil {
		return nil, errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "id", Value: id},
				{Key: "func", Value: "KYCRepo.FindByID"},
				{Key: "err", Value: err.Error()},
			}, "failed to get kyc")
	}

	return byID, nil
}

func (use *KYCUseCase) List(ctx context.Context, params usecase.KYCQueryParams) ([]*entity.KYC, int64, error) {
	q := repository.KYCQueryParams{
		PageIndex:  params.PageIndex,
		PageSize:   params.PageSize,
		SortByDate: true,
	}
	if params.UID != nil {
		q.UID = params.UID
	}
	if params.Country != nil {
		q.Country = params.Country
	}
	if params.Status != nil {
		q.Status = params.Status
	}

	list, i, err := use.KYCRepo.List(ctx, q)
	if err != nil {
		return nil, 0, errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "params", Value: params},
				{Key: "func", Value: "KYCRepo.List"},
				{Key: "err", Value: err.Error()},
			}, "failed to list kyc")
	}

	return list, i, nil
}

func (use *KYCUseCase) UpdateStatus(ctx context.Context, id string, status string, reason string) error {
	err := use.KYCRepo.UpdateStatus(ctx, id, status, reason)
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "params", Value: fmt.Sprintf("id:%s, status:%s, reason: %s", id, status, reason)},
				{Key: "func", Value: "KYCRepo.UpdateStatus"},
				{Key: "err", Value: err.Error()},
			}, "failed to update kyc status")
	}

	return nil
}

func (use *KYCUseCase) UpdateKYCInfo(ctx context.Context, id string, update *usecase.KYCUpdateParams) error {
	err := use.KYCRepo.UpdateKYCInfo(ctx, id, &repository.KYCUpdateParams{
		Name:               update.Name,
		Identification:     update.Identification,
		IdentificationType: update.IdentificationType,
		Address:            update.Address,
		PostalCode:         update.PostalCode,
		DateOfBirth:        update.DateOfBirth,
		Gender:             update.Gender,
		IDFrontImage:       update.IDFrontImage,
		IDBackImage:        update.IDBackImage,
		BankStatementImg:   update.BankStatementImg,
		BankCode:           update.BankCode,
		BankName:           update.BankName,
		BranchCode:         update.BranchCode,
		BranchName:         update.BranchName,
		BankAccount:        update.BankAccount,
	})
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "id", Value: id},
				{Key: "params", Value: update},
				{Key: "func", Value: "KYCRepo.UpdateKYCInfo"},
				{Key: "err", Value: err.Error()},
			}, "failed to update kyc")
	}

	return nil
}