package database

import (
	"context"
	"database/sql"
	"time"

	"git.eeqj.de/sneak/vaultik/internal/log"
)

// Upload represents a blob upload record
type Upload struct {
	BlobHash   string
	UploadedAt time.Time
	Size       int64
	DurationMs int64
}

// UploadRepository handles upload records
type UploadRepository struct {
	conn *sql.DB
}

// NewUploadRepository creates a new upload repository
func NewUploadRepository(conn *sql.DB) *UploadRepository {
	return &UploadRepository{conn: conn}
}

// Create inserts a new upload record
func (r *UploadRepository) Create(ctx context.Context, tx *sql.Tx, upload *Upload) error {
	query := `
		INSERT INTO uploads (blob_hash, uploaded_at, size, duration_ms)
		VALUES (?, ?, ?, ?)
	`

	var err error
	if tx != nil {
		_, err = tx.ExecContext(ctx, query, upload.BlobHash, upload.UploadedAt, upload.Size, upload.DurationMs)
	} else {
		_, err = r.conn.ExecContext(ctx, query, upload.BlobHash, upload.UploadedAt, upload.Size, upload.DurationMs)
	}

	return err
}

// GetByBlobHash retrieves an upload record by blob hash
func (r *UploadRepository) GetByBlobHash(ctx context.Context, blobHash string) (*Upload, error) {
	query := `
		SELECT blob_hash, uploaded_at, size, duration_ms
		FROM uploads
		WHERE blob_hash = ?
	`

	var upload Upload
	err := r.conn.QueryRowContext(ctx, query, blobHash).Scan(
		&upload.BlobHash,
		&upload.UploadedAt,
		&upload.Size,
		&upload.DurationMs,
	)

	if err == sql.ErrNoRows {
		return nil, nil
	}
	if err != nil {
		return nil, err
	}

	return &upload, nil
}

// GetRecentUploads retrieves recent uploads ordered by upload time
func (r *UploadRepository) GetRecentUploads(ctx context.Context, limit int) ([]*Upload, error) {
	query := `
		SELECT blob_hash, uploaded_at, size, duration_ms
		FROM uploads
		ORDER BY uploaded_at DESC
		LIMIT ?
	`

	rows, err := r.conn.QueryContext(ctx, query, limit)
	if err != nil {
		return nil, err
	}
	defer func() {
		if err := rows.Close(); err != nil {
			log.Error("failed to close rows", "error", err)
		}
	}()

	var uploads []*Upload
	for rows.Next() {
		var upload Upload
		if err := rows.Scan(&upload.BlobHash, &upload.UploadedAt, &upload.Size, &upload.DurationMs); err != nil {
			return nil, err
		}
		uploads = append(uploads, &upload)
	}

	return uploads, rows.Err()
}

// GetUploadStats returns aggregate statistics for uploads
func (r *UploadRepository) GetUploadStats(ctx context.Context, since time.Time) (*UploadStats, error) {
	query := `
		SELECT 
			COUNT(*) as count,
			COALESCE(SUM(size), 0) as total_size,
			COALESCE(AVG(duration_ms), 0) as avg_duration_ms,
			COALESCE(MIN(duration_ms), 0) as min_duration_ms,
			COALESCE(MAX(duration_ms), 0) as max_duration_ms
		FROM uploads
		WHERE uploaded_at >= ?
	`

	var stats UploadStats
	err := r.conn.QueryRowContext(ctx, query, since).Scan(
		&stats.Count,
		&stats.TotalSize,
		&stats.AvgDurationMs,
		&stats.MinDurationMs,
		&stats.MaxDurationMs,
	)

	return &stats, err
}

// UploadStats contains aggregate upload statistics
type UploadStats struct {
	Count         int64
	TotalSize     int64
	AvgDurationMs float64
	MinDurationMs int64
	MaxDurationMs int64
}