package app

import (
	"context"
	"encoding/json"
	"errors"

	"github.com/jackc/pgx/v5"

	"github.com/geo-platform/tenant-api/internal/shared/auth"
	"github.com/geo-platform/tenant-api/internal/shared/response"
	"github.com/geo-platform/tenant-api/internal/tenant/domain"
	"github.com/geo-platform/tenant-api/internal/tenant/repository"
)

type WorkspaceService struct {
	repo                   repository.WorkspaceRepository
	templates              repository.TemplateRepository
	supportedPlatformCount int
}

func NewWorkspaceService(repo repository.WorkspaceRepository, templates repository.TemplateRepository) *WorkspaceService {
	return &WorkspaceService{repo: repo, templates: templates, supportedPlatformCount: 5}
}

func (s *WorkspaceService) Overview(ctx context.Context) (*domain.WorkspaceOverview, error) {
	actor := auth.MustActor(ctx)
	articleCount, err := s.repo.CountArticlesByTenant(ctx, actor.TenantID)
	if err != nil {
		return nil, response.ErrInternal(50010, "query_failed", "failed to count articles")
	}
	publishedCount, err := s.repo.CountPublishedArticlesByTenant(ctx, actor.TenantID)
	if err != nil {
		return nil, response.ErrInternal(50010, "query_failed", "failed to count published articles")
	}
	brandCount, err := s.repo.CountBrandsByTenant(ctx, actor.TenantID)
	if err != nil {
		return nil, response.ErrInternal(50010, "query_failed", "failed to count brands")
	}

	return &domain.WorkspaceOverview{
		ArticleCount:           articleCount,
		PublishedCount:         publishedCount,
		BrandCount:             brandCount,
		SupportedPlatformCount: s.supportedPlatformCount,
	}, nil
}

func (s *WorkspaceService) RecentArticles(ctx context.Context) ([]domain.RecentArticle, error) {
	actor := auth.MustActor(ctx)

	rows, err := s.repo.GetRecentArticles(ctx, actor.TenantID)
	if err != nil {
		return nil, response.ErrInternal(50010, "query_failed", "failed to fetch recent articles")
	}

	articles := make([]domain.RecentArticle, 0, len(rows))
	for _, row := range rows {
		articles = append(articles, domain.RecentArticle{
			ID:             row.ID,
			GenerateStatus: row.GenerateStatus,
			PublishStatus:  row.PublishStatus,
			SourceType:     row.SourceType,
			CreatedAt:      row.CreatedAt,
			Title:          row.Title,
			WordCount:      row.WordCount,
			SourceLabel:    row.SourceLabel,
			TemplateName:   row.TemplateName,
		})
	}
	return articles, nil
}

func (s *WorkspaceService) QuotaSummary(ctx context.Context) (*domain.QuotaSummary, error) {
	actor := auth.MustActor(ctx)

	balance, err := s.repo.GetQuotaSummary(ctx, actor.TenantID)
	if err != nil {
		return nil, response.ErrInternal(50010, "query_failed", "failed to get quota balance")
	}

	plan, err := s.repo.GetActivePlanForTenant(ctx, actor.TenantID)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return &domain.QuotaSummary{Balance: balance}, nil
		}
		return nil, response.ErrInternal(50010, "query_failed", "failed to get active plan")
	}

	var policy map[string]int
	_ = json.Unmarshal(plan.QuotaPolicyJSON, &policy)
	total := policy["article_generation"]

	return &domain.QuotaSummary{
		PlanCode:   plan.PlanCode,
		PlanName:   plan.PlanName,
		TotalQuota: total,
		UsedQuota:  total - balance,
		Balance:    balance,
	}, nil
}

type TemplateCard struct {
	ID               int64                  `json:"id"`
	Scope            string                 `json:"scope"`
	TemplateKey      string                 `json:"template_key"`
	TemplateName     string                 `json:"template_name"`
	OriginType       string                 `json:"origin_type"`
	CardConfigJSON   map[string]interface{} `json:"card_config"`
	PromptVisibility string                 `json:"prompt_visibility"`
}

func (s *WorkspaceService) TemplateCards(ctx context.Context) ([]TemplateCard, error) {
	actor := auth.MustActor(ctx)

	rows, err := s.templates.ListTemplates(ctx, actor.TenantID)
	if err != nil {
		return nil, response.ErrInternal(50010, "query_failed", "failed to fetch templates")
	}

	cards := make([]TemplateCard, 0, len(rows))
	for _, row := range rows {
		card := TemplateCard{
			ID:               row.ID,
			Scope:            row.Scope,
			TemplateKey:      row.TemplateKey,
			TemplateName:     row.TemplateName,
			OriginType:       row.OriginType,
			PromptVisibility: effectivePromptVisibility(&row, actor.TenantID),
		}
		_ = json.Unmarshal(row.CardConfigJSON, &card.CardConfigJSON)
		cards = append(cards, card)
	}
	return cards, nil
}