package config

import (
	"database/sql"
	"fmt"
	"io"
	"log"
	"os"

	yaml "gopkg.in/yaml.v3"
)

const (
	defaultPort         = 7099
	defaultInstanceName = "BBJ"
	defaultHost         = "127.0.0.1"
	defaultDBPath       = "db.sqlite3"
)

type IOStreams struct {
	Err io.Writer
	Out io.Writer
}

type Config struct {
	Admins       []string
	Port         int
	Host         string
	InstanceName string `yaml:"instance_name"`
	AllowAnon    bool   `yaml:"allow_anon"`
	Debug        bool
	DBPath       string `yaml:"db_path"`
}

type Options struct {
	ConfigPath string
	IO         IOStreams
	Logger     *log.Logger
	Log        func(string)
	Logf       func(string, ...interface{})
	Config     Config
	DB         *sql.DB
	Reset      bool
}

func ParseConfig(configPath string) (*Config, error) {
	cfgBytes, err := os.ReadFile(configPath)
	if err != nil {
		return nil, fmt.Errorf("failed to read config file: %w", err)
	}

	var cfg Config

	if err := yaml.Unmarshal(cfgBytes, &cfg); err != nil {
		return nil, fmt.Errorf("failed to parse config: %w", err)
	}

	if cfg.Port == 0 {
		cfg.Port = defaultPort
	}

	if cfg.InstanceName == "" {
		cfg.InstanceName = defaultInstanceName

	}

	if cfg.Host == "" {
		cfg.Host = defaultHost
	}

	if cfg.DBPath == "" {
		cfg.DBPath = defaultDBPath
	}

	return &cfg, nil
}