package repository

import (
	"context"
	"time"

	"gitea.d3m0k1d.ru/d3m0k1d/HellreigN/backend/internal/storage"
	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
)

type LogRepository struct {
	Conn driver.Conn
}

func NewLogRepository(conn driver.Conn) *LogRepository {
	return &LogRepository{Conn: conn}
}

func (r *LogRepository) Init(ctx context.Context) error {
	return r.Conn.Exec(ctx, storage.CreateLogsTable)
}

func (r *LogRepository) Insert(ctx context.Context, log storage.LogEntry) error {
	return r.Conn.Exec(ctx, `
		INSERT INTO logs (timestamp, level, service, agent, message)
		VALUES ($1, $2, $3, $4, $5)
	`, log.Timestamp, log.Level, log.Service, log.Agent, log.Message)
}

func (r *LogRepository) InsertBatch(ctx context.Context, logs []storage.LogEntry) error {
	batch, err := r.Conn.PrepareBatch(ctx, "INSERT INTO logs (timestamp, level, service, agent, message)")
	if err != nil {
		return err
	}

	for _, log := range logs {
		if err := batch.Append(log.Timestamp, log.Level, log.Service, log.Agent, log.Message); err != nil {
			return err
		}
	}

	return batch.Send()
}

type LogFilter struct {
	Level   string
	Service string
	Agent   string
	DateFrom time.Time
	DateTo   time.Time
	Limit   int
	Offset  int
}

func (r *LogRepository) Search(ctx context.Context, filter LogFilter) ([]storage.LogEntry, error) {
	query := "SELECT timestamp, level, service, agent, message FROM logs WHERE 1=1"
	args := make([]interface{}, 0)
	argIdx := 1

	if filter.Level != "" {
		query += " AND level = $" + string(rune('0'+argIdx))
		args = append(args, filter.Level)
		argIdx++
	}

	if filter.Service != "" {
		query += " AND service = $" + string(rune('0'+argIdx))
		args = append(args, filter.Service)
		argIdx++
	}

	if filter.Agent != "" {
		query += " AND agent = $" + string(rune('0'+argIdx))
		args = append(args, filter.Agent)
		argIdx++
	}

	if !filter.DateFrom.IsZero() {
		query += " AND timestamp >= $" + string(rune('0'+argIdx))
		args = append(args, filter.DateFrom)
		argIdx++
	}

	if !filter.DateTo.IsZero() {
		query += " AND timestamp <= $" + string(rune('0'+argIdx))
		args = append(args, filter.DateTo)
		argIdx++
	}

	query += " ORDER BY timestamp DESC"

	if filter.Limit > 0 {
		query += " LIMIT $" + string(rune('0'+argIdx))
		args = append(args, filter.Limit)
		argIdx++
	} else {
		query += " LIMIT 100"
	}

	if filter.Offset > 0 {
		query += " OFFSET $" + string(rune('0'+argIdx))
		args = append(args, filter.Offset)
	}

	rows, err := r.Conn.Query(ctx, query, args...)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var logs []storage.LogEntry
	for rows.Next() {
		var log storage.LogEntry
		if err := rows.Scan(&log.Timestamp, &log.Level, &log.Service, &log.Agent, &log.Message); err != nil {
			return nil, err
		}
		logs = append(logs, log)
	}

	return logs, rows.Err()
}

func (r *LogRepository) GetDistinctServices(ctx context.Context) ([]string, error) {
	rows, err := r.Conn.Query(ctx, "SELECT DISTINCT service FROM logs ORDER BY service")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var services []string
	for rows.Next() {
		var service string
		if err := rows.Scan(&service); err != nil {
			return nil, err
		}
		services = append(services, service)
	}

	return services, rows.Err()
}

func (r *LogRepository) GetDistinctAgents(ctx context.Context) ([]string, error) {
	rows, err := r.Conn.Query(ctx, "SELECT DISTINCT agent FROM logs ORDER BY agent")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var agents []string
	for rows.Next() {
		var agent string
		if err := rows.Scan(&agent); err != nil {
			return nil, err
		}
		agents = append(agents, agent)
	}

	return agents, rows.Err()
}

func (r *LogRepository) GetDistinctLevels(ctx context.Context) ([]string, error) {
	rows, err := r.Conn.Query(ctx, "SELECT DISTINCT level FROM logs ORDER BY level")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var levels []string
	for rows.Next() {
		var level string
		if err := rows.Scan(&level); err != nil {
			return nil, err
		}
		levels = append(levels, level)
	}

	return levels, rows.Err()
}