package store

import (
	"database/sql"
	"fmt"
	"strconv"

	"github.com/local-mcp/local-mcp-go/internal/config"
	"github.com/local-mcp/local-mcp-go/internal/models"
)

// SettingsStore reads and writes the settings table.
type SettingsStore struct {
	db *sql.DB
}

// NewSettingsStore creates a SettingsStore backed by db.
func NewSettingsStore(db *sql.DB) *SettingsStore {
	return &SettingsStore{db: db}
}

// Get returns the current settings.
func (s *SettingsStore) Get() (models.Settings, error) {
	rows, err := s.db.Query(`SELECT key, value FROM settings`)
	if err != nil {
		return models.Settings{}, fmt.Errorf("get settings: %w", err)
	}
	defer rows.Close()

	cfg := models.Settings{
		DefaultWaitSeconds:     10,
		DefaultEmptyResponse:   config.DefaultEmptyResponse,
	}

	for rows.Next() {
		var key, value string
		if err := rows.Scan(&key, &value); err != nil {
			return cfg, err
		}
		switch key {
		case "default_wait_seconds":
			if n, err := strconv.Atoi(value); err == nil {
				cfg.DefaultWaitSeconds = n
			}
		}
	}
	return cfg, rows.Err()
}

// Update saves settings. Only non-nil fields are updated; pass a partial
// struct pointer using the Patch helper below.
func (s *SettingsStore) Update(patch models.Settings) error {
	_, err := s.db.Exec(`
		INSERT OR REPLACE INTO settings (key, value) VALUES
		('default_wait_seconds', ?)` ,
		strconv.Itoa(patch.DefaultWaitSeconds),
	)
	return err
}