package processor

import (
	"context"
	"fmt"

	"apskel-pos-be/internal/contract"
	"apskel-pos-be/internal/entities"
	"apskel-pos-be/internal/mappers"
	"apskel-pos-be/internal/models"
	"apskel-pos-be/internal/repository"
)

type CampaignProcessor interface {
	CreateCampaign(ctx context.Context, req *contract.CreateCampaignRequest) (*models.CampaignResponse, error)
	GetCampaign(ctx context.Context, id string) (*models.CampaignResponse, error)
	ListCampaigns(ctx context.Context, req *contract.ListCampaignsRequest) (*models.ListCampaignsResponse, error)
	UpdateCampaign(ctx context.Context, req *contract.UpdateCampaignRequest) (*models.CampaignResponse, error)
	DeleteCampaign(ctx context.Context, id string) error
	GetActiveCampaigns(ctx context.Context) ([]models.CampaignResponse, error)
	GetCampaignsForApp(ctx context.Context) ([]models.CampaignResponse, error)
}

type campaignProcessor struct {
	campaignRepo repository.CampaignRepository
}

func NewCampaignProcessor(campaignRepo repository.CampaignRepository) CampaignProcessor {
	return &campaignProcessor{
		campaignRepo: campaignRepo,
	}
}

func (p *campaignProcessor) CreateCampaign(ctx context.Context, req *contract.CreateCampaignRequest) (*models.CampaignResponse, error) {
	// Convert request to entity
	entity := mappers.ToCampaignEntity(req)
	if entity == nil {
		return nil, fmt.Errorf("invalid request data")
	}

	// Create in repository
	if err := p.campaignRepo.Create(ctx, entity); err != nil {
		return nil, fmt.Errorf("failed to create campaign: %w", err)
	}

	// Convert entity to response
	response := mappers.ToCampaignResponse(entity)
	return response, nil
}

func (p *campaignProcessor) GetCampaign(ctx context.Context, id string) (*models.CampaignResponse, error) {
	// Get from repository
	entity, err := p.campaignRepo.GetByID(ctx, id)
	if err != nil {
		return nil, fmt.Errorf("failed to get campaign: %w", err)
	}

	if entity == nil {
		return nil, fmt.Errorf("campaign not found")
	}

	// Convert entity to response
	response := mappers.ToCampaignResponse(entity)
	return response, nil
}

func (p *campaignProcessor) ListCampaigns(ctx context.Context, req *contract.ListCampaignsRequest) (*models.ListCampaignsResponse, error) {
	// Convert request to entity request
	entityReq := &entities.ListCampaignsRequest{
		Page:      req.Page,
		Limit:     req.Limit,
		Search:    req.Search,
		Type:      req.Type,
		IsActive:  req.IsActive,
		ShowOnApp: req.ShowOnApp,
		StartDate: req.StartDate,
		EndDate:   req.EndDate,
	}

	// Get from repository
	entities, total, err := p.campaignRepo.List(ctx, entityReq)
	if err != nil {
		return nil, fmt.Errorf("failed to list campaigns: %w", err)
	}

	// Convert entities to response
	campaigns := mappers.ToCampaignResponseSlice(entities)

	response := &models.ListCampaignsResponse{
		Campaigns: campaigns,
		Total:     total,
		Page:      req.Page,
		Limit:     req.Limit,
	}

	return response, nil
}

func (p *campaignProcessor) UpdateCampaign(ctx context.Context, req *contract.UpdateCampaignRequest) (*models.CampaignResponse, error) {
	// Convert request to entity
	entity := mappers.ToCampaignEntityFromUpdate(req)
	if entity == nil {
		return nil, fmt.Errorf("invalid request data")
	}

	// Update in repository
	if err := p.campaignRepo.Update(ctx, entity); err != nil {
		return nil, fmt.Errorf("failed to update campaign: %w", err)
	}

	// Get updated entity
	updatedEntity, err := p.campaignRepo.GetByID(ctx, req.ID.String())
	if err != nil {
		return nil, fmt.Errorf("failed to get updated campaign: %w", err)
	}

	// Convert entity to response
	response := mappers.ToCampaignResponse(updatedEntity)
	return response, nil
}

func (p *campaignProcessor) DeleteCampaign(ctx context.Context, id string) error {
	// Delete from repository
	if err := p.campaignRepo.Delete(ctx, id); err != nil {
		return fmt.Errorf("failed to delete campaign: %w", err)
	}

	return nil
}

func (p *campaignProcessor) GetActiveCampaigns(ctx context.Context) ([]models.CampaignResponse, error) {
	// Get from repository
	entities, err := p.campaignRepo.GetActiveCampaigns(ctx)
	if err != nil {
		return nil, fmt.Errorf("failed to get active campaigns: %w", err)
	}

	// Convert entities to response
	campaigns := mappers.ToCampaignResponseSlice(entities)
	return campaigns, nil
}

func (p *campaignProcessor) GetCampaignsForApp(ctx context.Context) ([]models.CampaignResponse, error) {
	// Get from repository
	entities, err := p.campaignRepo.GetCampaignsForApp(ctx)
	if err != nil {
		return nil, fmt.Errorf("failed to get campaigns for app: %w", err)
	}

	// Convert entities to response
	campaigns := mappers.ToCampaignResponseSlice(entities)
	return campaigns, nil
}

// Campaign Rule Processor
type CampaignRuleProcessor interface {
	CreateCampaignRule(ctx context.Context, req *contract.CreateCampaignRuleRequest) (*models.CampaignRuleResponse, error)
	GetCampaignRule(ctx context.Context, id string) (*models.CampaignRuleResponse, error)
	ListCampaignRules(ctx context.Context, req *contract.ListCampaignRulesRequest) (*models.ListCampaignRulesResponse, error)
	UpdateCampaignRule(ctx context.Context, req *contract.UpdateCampaignRuleRequest) (*models.CampaignRuleResponse, error)
	DeleteCampaignRule(ctx context.Context, id string) error
	GetCampaignRulesByCampaignID(ctx context.Context, campaignID string) ([]models.CampaignRuleResponse, error)
}

type campaignRuleProcessor struct {
	campaignRuleRepo repository.CampaignRuleRepository
}

func NewCampaignRuleProcessor(campaignRuleRepo repository.CampaignRuleRepository) CampaignRuleProcessor {
	return &campaignRuleProcessor{
		campaignRuleRepo: campaignRuleRepo,
	}
}

func (p *campaignRuleProcessor) CreateCampaignRule(ctx context.Context, req *contract.CreateCampaignRuleRequest) (*models.CampaignRuleResponse, error) {
	// Convert request to entity
	entity := &entities.CampaignRule{
		CampaignID:     req.CampaignID,
		RuleType:       entities.RuleType(req.RuleType),
		ConditionValue: req.ConditionValue,
		RewardType:     entities.CampaignRewardType(req.RewardType),
		RewardValue:    req.RewardValue,
		RewardSubtype:  (*entities.RewardSubtype)(req.RewardSubtype),
		RewardRefID:    req.RewardRefID,
		Metadata:       req.Metadata,
	}

	// Create in repository
	if err := p.campaignRuleRepo.Create(ctx, entity); err != nil {
		return nil, fmt.Errorf("failed to create campaign rule: %w", err)
	}

	// Convert entity to response
	response := mappers.ToCampaignRuleResponse(entity)
	return response, nil
}

func (p *campaignRuleProcessor) GetCampaignRule(ctx context.Context, id string) (*models.CampaignRuleResponse, error) {
	// Get from repository
	entity, err := p.campaignRuleRepo.GetByID(ctx, id)
	if err != nil {
		return nil, fmt.Errorf("failed to get campaign rule: %w", err)
	}

	if entity == nil {
		return nil, fmt.Errorf("campaign rule not found")
	}

	// Convert entity to response
	response := mappers.ToCampaignRuleResponse(entity)
	return response, nil
}

func (p *campaignRuleProcessor) ListCampaignRules(ctx context.Context, req *contract.ListCampaignRulesRequest) (*models.ListCampaignRulesResponse, error) {
	// Convert request to entity request
	entityReq := &entities.ListCampaignRulesRequest{
		Page:       req.Page,
		Limit:      req.Limit,
		CampaignID: req.CampaignID,
		RuleType:   req.RuleType,
		RewardType: req.RewardType,
	}

	// Get from repository
	entities, total, err := p.campaignRuleRepo.List(ctx, entityReq)
	if err != nil {
		return nil, fmt.Errorf("failed to list campaign rules: %w", err)
	}

	// Convert entities to response
	rules := mappers.ToCampaignRuleResponseSlice(entities)

	response := &models.ListCampaignRulesResponse{
		Rules: rules,
		Total: total,
		Page:  req.Page,
		Limit: req.Limit,
	}

	return response, nil
}

func (p *campaignRuleProcessor) UpdateCampaignRule(ctx context.Context, req *contract.UpdateCampaignRuleRequest) (*models.CampaignRuleResponse, error) {
	// Convert request to entity
	entity := &entities.CampaignRule{
		ID:             req.ID,
		CampaignID:     req.CampaignID,
		RuleType:       entities.RuleType(req.RuleType),
		ConditionValue: req.ConditionValue,
		RewardType:     entities.CampaignRewardType(req.RewardType),
		RewardValue:    req.RewardValue,
		RewardSubtype:  (*entities.RewardSubtype)(req.RewardSubtype),
		RewardRefID:    req.RewardRefID,
		Metadata:       req.Metadata,
	}

	// Update in repository
	if err := p.campaignRuleRepo.Update(ctx, entity); err != nil {
		return nil, fmt.Errorf("failed to update campaign rule: %w", err)
	}

	// Get updated entity
	updatedEntity, err := p.campaignRuleRepo.GetByID(ctx, req.ID.String())
	if err != nil {
		return nil, fmt.Errorf("failed to get updated campaign rule: %w", err)
	}

	// Convert entity to response
	response := mappers.ToCampaignRuleResponse(updatedEntity)
	return response, nil
}

func (p *campaignRuleProcessor) DeleteCampaignRule(ctx context.Context, id string) error {
	// Delete from repository
	if err := p.campaignRuleRepo.Delete(ctx, id); err != nil {
		return fmt.Errorf("failed to delete campaign rule: %w", err)
	}

	return nil
}

func (p *campaignRuleProcessor) GetCampaignRulesByCampaignID(ctx context.Context, campaignID string) ([]models.CampaignRuleResponse, error) {
	// Get from repository
	entities, err := p.campaignRuleRepo.GetByCampaignID(ctx, campaignID)
	if err != nil {
		return nil, fmt.Errorf("failed to get campaign rules by campaign ID: %w", err)
	}

	// Convert entities to response
	rules := mappers.ToCampaignRuleResponseSlice(entities)
	return rules, nil
}