package config

import (
	"fmt"
	"os"

	"git.linuxforward.com/byom/byom-core/logger"
	"gopkg.in/yaml.v3"
)

type Config struct {
	Server   *Server   `yaml:"server"`
	Database *Database `yaml:"database"`
	Log      *Log      `yaml:"log"`
	Jwt      *Jwt      `yaml:"jwt"`
	Smtp     *Smtp     `yaml:"smtp"`
	Oauth2   *Oauth2   `yaml:"oauth2"`
	Hook     *Hook     `yaml:"hook"`
}

func (c *Config) UnmarshalYAML(unmarshal func(interface{}) error) error {
	type plain Config
	err := unmarshal((*plain)(c))
	if err != nil {
		return err
	}
	if c.Server == nil {
		return fmt.Errorf("api config is required")
	}
	return nil
}

type Server struct {
	ListeningPort  int        `yaml:"listening_port"`
	TlsConfig      *TlsConfig `yaml:"tls"`
	Opts           []string   `yaml:"opts"`
	CorsOrigins    []string   `yaml:"cors_origins"`
	RequestTimeout int        `yaml:"request_timeout"` // in seconds
}

func (c *Server) UnmarshalYAML(unmarshal func(interface{}) error) error {
	type plain Server
	err := unmarshal((*plain)(c))
	if err != nil {
		return err
	}
	if c.ListeningPort == 0 {
		c.ListeningPort = 8443
	}
	if c.TlsConfig == nil {
		return fmt.Errorf("tls is required")
	}
	if c.TlsConfig.Enabled && (c.CorsOrigins == nil || len(c.CorsOrigins) == 0) {
		return fmt.Errorf("cors_origins must be set when TLS is enabled")
	}
	return nil
}

type TlsConfig struct {
	Enabled  bool   `yaml:"enabled"`
	CertFile string `yaml:"cert"`
	KeyFile  string `yaml:"key"`
}

func (c *TlsConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
	type plain TlsConfig
	err := unmarshal((*plain)(c))
	if err != nil {
		return err
	}
	if c.CertFile == "" && c.Enabled {
		return fmt.Errorf("tls cert is required")
	}
	if c.KeyFile == "" && c.Enabled {
		return fmt.Errorf("tls key is required")
	}
	return nil
}

type Smtp struct {
	Host string `yaml:"host"`
	Port int    `yaml:"port"`
	User string `yaml:"user"`
	Pass string `yaml:"pass"`
}

func (c *Smtp) UnmarshalYAML(unmarshal func(interface{}) error) error {
	type plain Smtp
	err := unmarshal((*plain)(c))
	if err != nil {
		return err
	}
	// if c.Host == "" {
	// 	return fmt.Errorf("smtp host is required")
	// }
	// if c.Port == 0 {
	// 	c.Port = 587
	// }
	// if c.User == "" {
	// 	return fmt.Errorf("smtp user is required")
	// }
	// if c.Pass == "" {
	// 	return fmt.Errorf("smtp pass is required")
	// }
	return nil
}

type Database struct {
	Path            string   `yaml:"path"`
	LogMode         bool     `yaml:"log_mode"`
	MaxOpenConns    int      `yaml:"max_open_conns"`
	MaxIdleConns    int      `yaml:"max_idle_conns"`
	ConnMaxLifetime int      `yaml:"conn_max_lifetime"`
	Pragma          []string `yaml:"pragma"`
}

func (c *Database) UnmarshalYAML(unmarshal func(interface{}) error) error {
	type plain Database
	err := unmarshal((*plain)(c))
	if err != nil {
		return err
	}
	if c.Path == "" {
		return fmt.Errorf("database path is required")
	}
	if c.MaxOpenConns == 0 {
		c.MaxOpenConns = 10
	}
	if c.MaxIdleConns == 0 {
		c.MaxIdleConns = 5
	}
	if c.ConnMaxLifetime == 0 {
		c.ConnMaxLifetime = 300
	}
	return nil
}

type Jwt struct {
	JwtSecret string `yaml:"jwt_secret"`
}

func (c *Jwt) UnmarshalYAML(unmarshal func(interface{}) error) error {
	type plain Jwt
	err := unmarshal((*plain)(c))
	if err != nil {
		return err
	}
	if c.JwtSecret == "" {
		return fmt.Errorf("jwt secret is required")
	}
	return nil
}

type Oauth2 struct {
	ClientID     string `yaml:"client_id"`
	ClientSecret string `yaml:"client_secret"`
	RedirectURL  string `yaml:"redirect_url"`
	AuthURL      string `yaml:"auth_url"`
	TokenURL     string `yaml:"token_url"`
	UserInfoURL  string `yaml:"user_info_url"`
}

func (c *Oauth2) UnmarshalYAML(unmarshal func(interface{}) error) error {
	type plain Oauth2
	err := unmarshal((*plain)(c))
	if err != nil {
		return err
	}
	if c.ClientID == "" {
		return fmt.Errorf("client id is required")
	}
	if c.ClientSecret == "" {
		return fmt.Errorf("client secret is required")
	}
	if c.RedirectURL == "" {
		return fmt.Errorf("redirect url is required")
	}
	if c.AuthURL == "" {
		return fmt.Errorf("auth url is required")
	}
	if c.TokenURL == "" {
		return fmt.Errorf("token url is required")
	}
	if c.UserInfoURL == "" {
		return fmt.Errorf("user info url is required")
	}
	return nil
}

type Log struct {
	Level            string   `yaml:"level"`
	NoColor          bool     `yaml:"no_color"`
	ForceColors      bool     `yaml:"force_colors"`
	InJson           bool     `yaml:"in_json"`
	FilterComponents []string `yaml:"filter_components"`
}

func (c *Log) UnmarshalYAML(unmarshal func(interface{}) error) error {
	type plain Log
	err := unmarshal((*plain)(c))
	if err != nil {
		return err
	}

	return logger.Configure(c.Level, c.NoColor, c.ForceColors, c.InJson)
}

type Hook struct {
	BaseURL   string `yaml:"base_url"`
	Domain    string `yaml:"domain"`
	SecretKey string `yaml:"secret_key"`
}

func ReadConfig(configPath string) (*Config, error) {
	cnf := &Config{}
	b, err := os.ReadFile(configPath)
	if err != nil {
		return nil, err
	}
	err = yaml.Unmarshal(b, cnf)
	if err != nil {
		return nil, err
	}
	return cnf, nil
}