package main

import (
	"database/sql"
	"fmt"
	"time"
)

// SeedSocial creates follows, track_likes, track_reposts, comments, and user_blocks.
func SeedSocial(db *sql.DB, cfg Config, users []SeededUser, tracks []SeededTrack) error {
	fmt.Println("\n═══ SOCIAL ═══")

	artists := GetArtists(users)
	allUsers := users

	// ── 1. Follows (scale-free distribution) ─────────────────────────────────
	p := NewProgress("follows", cfg.Follows)
	followRows := make([][]interface{}, 0, cfg.Follows)
	followSeen := make(map[string]bool)

	// Build popularity weights: artists are much more likely to be followed
	artistSet := make(map[string]bool)
	for _, a := range artists {
		artistSet[a.ID] = true
	}

	for i := 0; i < cfg.Follows*2 && len(followRows) < cfg.Follows; i++ {
		follower := allUsers[rng.Intn(len(allUsers))]

		// 70% chance to follow an artist, 30% random user
		var followed SeededUser
		if randChance(70) && len(artists) > 0 {
			// Power-law: top artists get followed more
			idx := PowerLaw(0, len(artists)-1, 1.5)
			followed = artists[idx]
		} else {
			followed = allUsers[rng.Intn(len(allUsers))]
		}

		if follower.ID == followed.ID {
			continue
		}
		key := follower.ID + ":" + followed.ID
		if followSeen[key] {
			continue
		}
		followSeen[key] = true

		createdAt := RandomTimeAfter(follower.CreatedAt)
		if followed.CreatedAt.After(follower.CreatedAt) {
			createdAt = RandomTimeAfter(followed.CreatedAt)
		}

		followRows = append(followRows, []interface{}{
			newUUID(), follower.ID, followed.ID, createdAt, createdAt,
		})
	}

	// Ensure test artist@veza.music has many followers
	testArtist := findUser(users, "artist@veza.music")
	if testArtist != nil {
		for _, u := range users[:min(200, len(users))] {
			if u.ID == testArtist.ID {
				continue
			}
			key := u.ID + ":" + testArtist.ID
			if followSeen[key] {
				continue
			}
			followSeen[key] = true
			followRows = append(followRows, []interface{}{
				newUUID(), u.ID, testArtist.ID, RandomTimeAfter(u.CreatedAt), time.Now(),
			})
		}
	}

	_, err := BulkInsert(db, "follows",
		"id, follower_id, followed_id, created_at, updated_at",
		followRows)
	if err != nil {
		return fmt.Errorf("insert follows: %w", err)
	}
	p.Update(len(followRows))
	p.Done()

	// ── 2. Track likes ───────────────────────────────────────────────────────
	if len(tracks) == 0 {
		return nil
	}

	p = NewProgress("track_likes", cfg.TrackLikes)
	likeRows := make([][]interface{}, 0, cfg.TrackLikes)
	likeSeen := make(map[string]bool)

	for i := 0; i < cfg.TrackLikes*2 && len(likeRows) < cfg.TrackLikes; i++ {
		user := allUsers[rng.Intn(len(allUsers))]
		// Power-law: popular tracks get more likes
		track := tracks[PowerLaw(0, len(tracks)-1, 1.2)]
		key := user.ID + ":" + track.ID
		if likeSeen[key] {
			continue
		}
		likeSeen[key] = true
		likeRows = append(likeRows, []interface{}{
			newUUID(), user.ID, track.ID, time.Now(),
		})
	}

	_, err = BulkInsert(db, "track_likes",
		"id, user_id, track_id, created_at",
		likeRows)
	if err != nil {
		return fmt.Errorf("insert track_likes: %w", err)
	}
	p.Update(len(likeRows))
	p.Done()

	// ── 3. Track reposts ─────────────────────────────────────────────────────
	p = NewProgress("track_reposts", cfg.TrackReposts)
	repostRows := make([][]interface{}, 0, cfg.TrackReposts)
	repostSeen := make(map[string]bool)

	for i := 0; i < cfg.TrackReposts*2 && len(repostRows) < cfg.TrackReposts; i++ {
		user := allUsers[rng.Intn(len(allUsers))]
		track := tracks[PowerLaw(0, len(tracks)-1, 1.2)]
		if user.ID == track.CreatorID {
			continue // Don't repost own tracks
		}
		key := user.ID + ":" + track.ID
		if repostSeen[key] {
			continue
		}
		repostSeen[key] = true
		repostRows = append(repostRows, []interface{}{
			newUUID(), user.ID, track.ID, time.Now(),
		})
	}

	_, err = BulkInsert(db, "track_reposts",
		"id, user_id, track_id, created_at",
		repostRows)
	if err != nil {
		return fmt.Errorf("insert track_reposts: %w", err)
	}
	p.Update(len(repostRows))
	p.Done()

	// ── 4. Comments (track_comments + generic comments) ──────────────────────
	p = NewProgress("track_comments", cfg.Comments)
	commentRows := make([][]interface{}, 0, cfg.Comments)

	for i := 0; i < cfg.Comments; i++ {
		user := allUsers[rng.Intn(len(allUsers))]
		track := tracks[PowerLaw(0, len(tracks)-1, 1.0)]
		content := GenComment()
		createdAt := RandomTimeAfter(user.CreatedAt)

		// Timed comment: position within the track
		var timestampSec *int
		if randChance(40) {
			ts := randInt(0, track.Duration)
			timestampSec = &ts
		}

		commentRows = append(commentRows, []interface{}{
			newUUID(), track.ID, user.ID, content,
			nil, // parent_comment_id
			timestampSec, false, false, nil,
			createdAt, createdAt, nil,
		})
	}

	_, err = BulkInsert(db, "track_comments",
		"id, track_id, user_id, content, parent_comment_id, timestamp_seconds, is_edited, is_deleted, parent_id, created_at, updated_at, deleted_at",
		commentRows)
	if err != nil {
		return fmt.Errorf("insert track_comments: %w", err)
	}
	p.Update(len(commentRows))
	p.Done()

	// Also populate the generic 'comments' table (used for track comments via target_type)
	p = NewProgress("comments (generic)", cfg.Comments/2)
	genCommentRows := make([][]interface{}, 0, cfg.Comments/2)
	for i := 0; i < cfg.Comments/2; i++ {
		user := allUsers[rng.Intn(len(allUsers))]
		track := tracks[rng.Intn(len(tracks))]
		content := GenComment()
		createdAt := RandomTimeAfter(user.CreatedAt)
		genCommentRows = append(genCommentRows, []interface{}{
			newUUID(), user.ID, track.ID, "track", content, createdAt, createdAt,
		})
	}
	_, _ = BulkInsert(db, "comments",
		"id, user_id, target_id, target_type, content, created_at, updated_at",
		genCommentRows)
	p.Update(len(genCommentRows))
	p.Done()

	// ── 5. User blocks (small number) ────────────────────────────────────────
	blockCount := len(users) / 50 // ~2% of users have blocked someone
	if blockCount < 5 {
		blockCount = 5
	}
	p = NewProgress("user_blocks", blockCount)
	blockRows := make([][]interface{}, 0, blockCount)
	blockSeen := make(map[string]bool)

	for i := 0; i < blockCount; i++ {
		blocker := allUsers[rng.Intn(len(allUsers))]
		blocked := allUsers[rng.Intn(len(allUsers))]
		if blocker.ID == blocked.ID {
			continue
		}
		key := blocker.ID + ":" + blocked.ID
		if blockSeen[key] {
			continue
		}
		blockSeen[key] = true
		blockRows = append(blockRows, []interface{}{
			newUUID(), blocker.ID, blocked.ID, nil, time.Now(), time.Now(),
		})
	}

	_, _ = BulkInsert(db, "user_blocks",
		"id, blocker_id, blocked_id, reason, created_at, updated_at",
		blockRows)
	p.Update(len(blockRows))
	p.Done()

	return nil
}

func findUser(users []SeededUser, email string) *SeededUser {
	for i := range users {
		if users[i].Email == email {
			return &users[i]
		}
	}
	return nil
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}