package analysis

import (
	"context"
	"encoding/json"
	"fmt"
	"time"

	"git.linuxforward.com/byom/byom-trends/common"
	"git.linuxforward.com/byom/byom-trends/logger"
	"git.linuxforward.com/byom/byom-trends/services/google"
	"git.linuxforward.com/byom/byom-trends/services/instagram"
	"git.linuxforward.com/byom/byom-trends/services/tiktok"
	"git.linuxforward.com/byom/byom-trends/services/youtube"
	"github.com/sirupsen/logrus"
)

type TrendAnalyzer struct {
	instagramSvc *instagram.Client
	tiktokSvc    *tiktok.Client
	youtubeSvc   *youtube.Client
	googleSvc    *google.Client
	logger       *logrus.Entry
}

type EngagementMetrics struct {
	Platform   string  `json:"platform"`
	Engagement float64 `json:"engagement"`
	PostCount  int64   `json:"post_count"`
	Followers  int64   `json:"followers"`
	TotalLikes int64   `json:"total_likes"`
	TotalViews int64   `json:"total_views"`
	GrowthRate float64 `json:"growth_rate"`
}

type ContentTrends struct {
	TopHashtags    map[string]int    `json:"top_hashtags"`
	TopKeywords    map[string]int    `json:"top_keywords"`
	PopularTopics  []string          `json:"popular_topics"`
	BestPerforming map[string]string `json:"best_performing"` // platform -> content ID
	PostingTimes   map[string]int    `json:"posting_times"`   // hour -> count
}

type AudienceMetrics struct {
	Demographics map[string]float64 `json:"demographics"`
	Interests    []string           `json:"interests"`
	Locations    map[string]int     `json:"locations"`
	ActiveHours  map[int]int        `json:"active_hours"`
}

func NewTrendAnalyzer(
	instagramSvc *instagram.Client,
	tiktokSvc *tiktok.Client,
	youtubeSvc *youtube.Client,
	googleSvc *google.Client,
) *TrendAnalyzer {
	return &TrendAnalyzer{
		instagramSvc: instagramSvc,
		tiktokSvc:    tiktokSvc,
		youtubeSvc:   youtubeSvc,
		googleSvc:    googleSvc,
		logger:       logger.NewLogger("trend-analyzer"),
	}
}

func (a *TrendAnalyzer) AnalyzeEngagement(ctx context.Context, profile *common.SocialProfile) (*EngagementMetrics, error) {
	metrics := &EngagementMetrics{
		Platform: profile.Platform,
	}

	switch profile.Platform {
	case "instagram":
		stats, err := a.instagramSvc.GetProfileStats(profile.Username)
		if err != nil {
			return nil, fmt.Errorf("get instagram stats: %w", err)
		}
		posts, err := a.instagramSvc.GetRecentPosts(profile.Username, 50)
		if err != nil {
			return nil, fmt.Errorf("get instagram posts: %w", err)
		}
		metrics.Engagement = a.instagramSvc.CalculateEngagement(posts)
		metrics.Followers = stats.FollowerCount

	case "tiktok":
		stats, err := a.tiktokSvc.GetProfileStats(profile.Username)
		if err != nil {
			return nil, fmt.Errorf("get tiktok stats: %w", err)
		}
		videos, err := a.tiktokSvc.GetRecentVideos(profile.Username, 50)
		if err != nil {
			return nil, fmt.Errorf("get tiktok videos: %w", err)
		}
		metrics.Engagement = a.tiktokSvc.CalculateEngagement(videos)
		metrics.Followers = stats.FollowerCount

	case "youtube":
		stats, err := a.youtubeSvc.GetChannelStats(profile.Username)
		if err != nil {
			return nil, fmt.Errorf("get youtube stats: %w", err)
		}
		videos, err := a.youtubeSvc.GetRecentVideos(profile.Username, 50)
		if err != nil {
			return nil, fmt.Errorf("get youtube videos: %w", err)
		}
		metrics.Engagement = a.youtubeSvc.CalculateEngagement(videos)
		metrics.Followers = stats.SubscriberCount
	}

	return metrics, nil
}

func (a *TrendAnalyzer) AnalyzeContent(ctx context.Context, profile *common.SocialProfile) (*ContentTrends, error) {
	trends := &ContentTrends{
		TopHashtags:    make(map[string]int),
		TopKeywords:    make(map[string]int),
		PostingTimes:   make(map[string]int),
		BestPerforming: make(map[string]string),
	}

	switch profile.Platform {
	case "instagram":
		posts, err := a.instagramSvc.GetRecentPosts(profile.Username, 100)
		if err != nil {
			return nil, fmt.Errorf("get instagram posts: %w", err)
		}
		// Analyze posting times
		for _, post := range posts {
			hour := post.Timestamp.Format("15")
			trends.PostingTimes[hour]++
		}

	case "tiktok":
		videos, err := a.tiktokSvc.GetRecentVideos(profile.Username, 100)
		if err != nil {
			return nil, fmt.Errorf("get tiktok videos: %w", err)
		}
		trends.TopHashtags = a.tiktokSvc.GetTrendingHashtags(videos)

	case "youtube":
		videos, err := a.youtubeSvc.GetRecentVideos(profile.Username, 100)
		if err != nil {
			return nil, fmt.Errorf("get youtube videos: %w", err)
		}
		trends.TopHashtags = a.youtubeSvc.GetTrendingTags(videos)
	}

	// Get related topics from Google Trends
	topics, err := a.googleSvc.GetRelatedTopics(profile.Username)
	if err != nil {
		a.logger.WithError(err).Warn("failed to get related topics")
	} else {
		for _, topic := range topics {
			trends.PopularTopics = append(trends.PopularTopics, topic.Title)
		}
	}

	return trends, nil
}

func (a *TrendAnalyzer) AnalyzeAudience(ctx context.Context, profile *common.SocialProfile) (*AudienceMetrics, error) {
	metrics := &AudienceMetrics{
		Demographics: make(map[string]float64),
		Locations:    make(map[string]int),
		ActiveHours:  make(map[int]int),
	}

	// Get regional interest from Google Trends
	locations, err := a.googleSvc.GetRegionalInterest(profile.Username, "")
	if err != nil {
		a.logger.WithError(err).Warn("failed to get regional interest")
	} else {
		metrics.Locations = locations
	}

	// Analyze active hours based on content posting times and engagement
	switch profile.Platform {
	case "instagram":
		posts, err := a.instagramSvc.GetRecentPosts(profile.Username, 100)
		if err != nil {
			return nil, fmt.Errorf("get instagram posts: %w", err)
		}
		for _, post := range posts {
			hour := post.Timestamp.Hour()
			metrics.ActiveHours[hour]++
		}

	case "tiktok":
		videos, err := a.tiktokSvc.GetRecentVideos(profile.Username, 100)
		if err != nil {
			return nil, fmt.Errorf("get tiktok videos: %w", err)
		}
		for _, video := range videos {
			hour := video.CreateTime.Hour()
			metrics.ActiveHours[hour]++
		}

	case "youtube":
		videos, err := a.youtubeSvc.GetRecentVideos(profile.Username, 100)
		if err != nil {
			return nil, fmt.Errorf("get youtube videos: %w", err)
		}
		for _, video := range videos {
			hour := video.PublishedAt.Hour()
			metrics.ActiveHours[hour]++
		}
	}

	return metrics, nil
}

func (a *TrendAnalyzer) GenerateReport(ctx context.Context, profile *common.SocialProfile) (*common.TrendAnalysis, error) {
	engagement, err := a.AnalyzeEngagement(ctx, profile)
	if err != nil {
		return nil, fmt.Errorf("analyze engagement: %w", err)
	}

	content, err := a.AnalyzeContent(ctx, profile)
	if err != nil {
		return nil, fmt.Errorf("analyze content: %w", err)
	}

	audience, err := a.AnalyzeAudience(ctx, profile)
	if err != nil {
		return nil, fmt.Errorf("analyze audience: %w", err)
	}

	// Combine all analyses into a single report
	report := map[string]interface{}{
		"engagement": engagement,
		"content":    content,
		"audience":   audience,
		"timestamp":  time.Now(),
	}

	reportJSON, err := json.Marshal(report)
	if err != nil {
		return nil, fmt.Errorf("marshal report: %w", err)
	}

	analysis := &common.TrendAnalysis{
		Type: "comprehensive",
		Data: reportJSON,
	}

	return analysis, nil
}