package config

import (
	"fmt"
	"net"
	"os"
	"strconv"
	"time"

	"gopkg.in/yaml.v3"
)

type Config struct {
	Server  ServerConfig  `yaml:"server"`
	Export  ExportConfig  `yaml:"export"`
	Logging LoggingConfig `yaml:"logging"`
	Backup  BackupConfig  `yaml:"backup"`
}

type ServerConfig struct {
	Host         string        `yaml:"host"`
	Port         int           `yaml:"port"`
	Mode         string        `yaml:"mode"`
	ReadTimeout  time.Duration `yaml:"read_timeout"`
	WriteTimeout time.Duration `yaml:"write_timeout"`
}

type LoggingConfig struct {
	Level    string `yaml:"level"`
	Format   string `yaml:"format"`
	Output   string `yaml:"output"`
	FilePath string `yaml:"file_path"`
}

// ExportConfig is kept for constructor compatibility in export services.
// Runtime no longer persists an export section in config.yaml.
type ExportConfig struct{}

type BackupConfig struct {
	Time string `yaml:"time"`
}

func Load(path string) (*Config, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, fmt.Errorf("reading config file: %w", err)
	}

	var cfg Config
	if err := yaml.Unmarshal(data, &cfg); err != nil {
		return nil, fmt.Errorf("parsing config file: %w", err)
	}

	cfg.setDefaults()

	return &cfg, nil
}

func (c *Config) setDefaults() {
	if c.Server.Host == "" {
		c.Server.Host = "127.0.0.1"
	}
	if c.Server.Port == 0 {
		c.Server.Port = 8080
	}
	if c.Server.Mode == "" {
		c.Server.Mode = "release"
	}
	if c.Server.ReadTimeout == 0 {
		c.Server.ReadTimeout = 30 * time.Second
	}
	if c.Server.WriteTimeout == 0 {
		c.Server.WriteTimeout = 30 * time.Second
	}

	if c.Logging.Level == "" {
		c.Logging.Level = "info"
	}
	if c.Logging.Format == "" {
		c.Logging.Format = "json"
	}
	if c.Logging.Output == "" {
		c.Logging.Output = "stdout"
	}

	if c.Backup.Time == "" {
		c.Backup.Time = "00:00"
	}
}

func (c *Config) Address() string {
	return net.JoinHostPort(c.Server.Host, strconv.Itoa(c.Server.Port))
}