package mappers

import (
	"apskel-pos-be/internal/constants"
	"apskel-pos-be/internal/entities"
	"apskel-pos-be/internal/models"
)

// Amounts are money rounded to two decimals, so anything under half a cent apart
// is the same figure. Comparing them directly would leave an advance a hundredth of
// a rupiah short of settled.
const cashAdvanceAmountEpsilon = 0.005

// cashAdvanceTeamFromEntity renders the team an advance was handed to. Unlike a
// purchase order there is always one, so this never returns nil. The category name
// is only filled in when TeamCategory was preloaded.
func cashAdvanceTeamFromEntity(entity *entities.CashAdvance) *models.PurchaseTeam {
	team := &models.PurchaseTeam{Scope: entity.TeamScope}

	switch entity.TeamScope {
	case constants.PurchaseTeamScopeCentral:
		team.Name = constants.PurchaseTeamCentralName
	case constants.PurchaseTeamScopeCategory:
		team.CategoryID = entity.TeamCategoryID
		if entity.TeamCategory != nil {
			team.Name = entity.TeamCategory.Name
		}
	}

	return team
}

// cashAdvanceSettlementStatus reads the money rather than any stored flag: cash is
// accounted for by spending charged to the advance plus what was handed back. A
// team that overspent still counts as settled — the excess is owed back to them.
func cashAdvanceSettlementStatus(amount, settled, returned float64) string {
	accounted := settled + returned

	switch {
	case accounted <= cashAdvanceAmountEpsilon:
		return constants.CashAdvanceSettlementOpen
	case amount-accounted > cashAdvanceAmountEpsilon:
		return constants.CashAdvanceSettlementPartial
	default:
		return constants.CashAdvanceSettlementSettled
	}
}

func CashAdvanceEntityToModel(entity *entities.CashAdvance) *models.CashAdvance {
	if entity == nil {
		return nil
	}

	return &models.CashAdvance{
		ID:             entity.ID,
		OrganizationID: entity.OrganizationID,
		OutletID:       entity.OutletID,
		CodeNumber:     entity.CodeNumber,
		TeamScope:      entity.TeamScope,
		TeamCategoryID: entity.TeamCategoryID,
		Amount:         entity.Amount,
		ReturnedAmount: entity.ReturnedAmount,
		IssuedDate:     entity.IssuedDate,
		DueDate:        entity.DueDate,
		Status:         entity.Status,
		Description:    entity.Description,
		CreatedAt:      entity.CreatedAt,
		UpdatedAt:      entity.UpdatedAt,
	}
}

func CashAdvanceEntityToResponse(entity *entities.CashAdvance) *models.CashAdvanceResponse {
	if entity == nil {
		return nil
	}

	return &models.CashAdvanceResponse{
		ID:               entity.ID,
		OrganizationID:   entity.OrganizationID,
		OutletID:         entity.OutletID,
		CodeNumber:       entity.CodeNumber,
		TeamScope:        entity.TeamScope,
		TeamCategoryID:   entity.TeamCategoryID,
		Amount:           entity.Amount,
		SettledAmount:    entity.SettledAmount,
		ReturnedAmount:   entity.ReturnedAmount,
		RemainingAmount:  entity.Amount - entity.SettledAmount - entity.ReturnedAmount,
		SettlementStatus: cashAdvanceSettlementStatus(entity.Amount, entity.SettledAmount, entity.ReturnedAmount),
		IssuedDate:       entity.IssuedDate,
		DueDate:          entity.DueDate,
		Status:           entity.Status,
		Description:      entity.Description,
		CreatedAt:        entity.CreatedAt,
		UpdatedAt:        entity.UpdatedAt,
		Team:             cashAdvanceTeamFromEntity(entity),
	}
}

func CashAdvanceEntitiesToResponses(entities []*entities.CashAdvance) []*models.CashAdvanceResponse {
	if entities == nil {
		return nil
	}

	responses := make([]*models.CashAdvanceResponse, len(entities))
	for i, entity := range entities {
		responses[i] = CashAdvanceEntityToResponse(entity)
	}
	return responses
}

func CashAdvanceSettlementEntitiesToModels(settlements []*entities.CashAdvanceSettlement) []models.CashAdvanceSettlement {
	if settlements == nil {
		return nil
	}

	result := make([]models.CashAdvanceSettlement, len(settlements))
	for i, settlement := range settlements {
		result[i] = models.CashAdvanceSettlement{
			Type:   settlement.Type,
			ID:     settlement.ID,
			Number: settlement.Number,
			Date:   settlement.Date,
			Amount: settlement.Amount,
			Status: settlement.Status,
		}
	}
	return result
}