package repository

import (
	"github.com/google/uuid"
	"github.com/zs/InsightReply/internal/model"
	"gorm.io/gorm"
)

type ReplyRepository struct {
	db *gorm.DB
}

func NewReplyRepository(db *gorm.DB) *ReplyRepository {
	return &ReplyRepository{db: db}
}

// CreateGeneratedReply logs an AI generated response when it is copied/used by the user
func (r *ReplyRepository) CreateGeneratedReply(reply *model.GeneratedReply) error {
	return r.db.Create(reply).Error
}

// GetPendingPerformanceChecks returns copied replies that need their performance checked (e.g. older than 24h)
func (r *ReplyRepository) GetPendingPerformanceChecks() ([]model.GeneratedReply, error) {
	var replies []model.GeneratedReply
	
	// Complex: Fetch replies that are "copied", created more than 24 hours ago, 
	// and DO NOT already have a corresponding entry in reply_performance.
	err := r.db.Table("generated_replies").
		Select("generated_replies.*").
		Joins("LEFT JOIN reply_performance rp ON rp.reply_id = generated_replies.id").
		Where("generated_replies.status = ?", "copied").
		Where("generated_replies.created_at < NOW() - INTERVAL '1 day'").
		Where("rp.id IS NULL").
		Find(&replies).Error
		
	return replies, err
}

// SaveReplyPerformance persists the checked engagement scores of a generated reply
func (r *ReplyRepository) SaveReplyPerformance(perf *model.ReplyPerformance) error {
	return r.db.Create(perf).Error
}

// UpsertDummyTweet acts as a safety hook to guarantee foreign key integrity exists before recording a reply onto an un-crawled Tweet.
func (r *ReplyRepository) UpsertDummyTweet(tweet *model.Tweet) error {
	return r.db.Where("x_tweet_id = ?", tweet.XTweetID).FirstOrCreate(tweet).Error
}

// GetTweetXTweetID returns the string identifier string X uses, converting backwards from the postgres UUID
func (r *ReplyRepository) GetTweetXTweetID(tweetID uuid.UUID) (string, error) {
	var tweet model.Tweet
	err := r.db.Where("id = ?", tweetID).First(&tweet).Error
	return tweet.XTweetID, err
}

// SaveStyleExtraction commits an AI-learned writing style profile against the user for future inference injection
func (r *ReplyRepository) SaveStyleExtraction(userID uuid.UUID, styleDesc string) error {
	// user_style_profiles might not exist yet; use raw SQL or Gorm Upsert
	return r.db.Exec(`
		INSERT INTO user_style_profiles (user_id, tone_preference) 
		VALUES (?, ?) 
		ON CONFLICT (user_id) 
		DO UPDATE SET tone_preference = EXCLUDED.tone_preference, updated_at = NOW()
	`, userID, styleDesc).Error
}

// GetGeneratedRepliesByUser retrieves all AI replies for a user to display in the History dashboard
func (r *ReplyRepository) GetGeneratedRepliesByUser(userID uuid.UUID) ([]model.GeneratedReply, error) {
	var replies []model.GeneratedReply
	// Preload the performance data if it exists. Preloading "Performance" requires GORM association.
	// We'll just fetch replies and order by newest first.
	err := r.db.Where("user_id = ?", userID).Order("created_at desc").Limit(100).Find(&replies).Error
	return replies, err
}