package infra

import (
	"time"

	"github.com/spf13/viper"
)

// Config holds all configuration for the application
type Config struct {
	Server    ServerConfig    `mapstructure:"server"`
	Database  DatabaseConfig  `mapstructure:"database"`
	Cache     CacheConfig     `mapstructure:"cache"`
	Queue     QueueConfig     `mapstructure:"queue"`
	Search    SearchConfig    `mapstructure:"search"`
	Auth      AuthConfig      `mapstructure:"auth"`
	AI        AIConfig        `mapstructure:"ai"`
	Scraping  ScrapingConfig  `mapstructure:"scraping"`
	Logging   LoggingConfig   `mapstructure:"logging"`
	RateLimit RateLimitConfig `mapstructure:"rate_limiting"`
}

type ServerConfig struct {
	Host         string        `mapstructure:"host"`
	Port         int           `mapstructure:"port"`
	Timeout      time.Duration `mapstructure:"timeout"`
	ReadTimeout  time.Duration `mapstructure:"read_timeout"`
	WriteTimeout time.Duration `mapstructure:"write_timeout"`
}

type DatabaseConfig struct {
	MongoDB MongoConfig `mapstructure:"mongodb"`
}

type MongoConfig struct {
	URI         string        `mapstructure:"uri"`
	Name        string        `mapstructure:"name"`
	Timeout     time.Duration `mapstructure:"timeout"`
	MaxPoolSize int           `mapstructure:"max_pool_size"`
}

type CacheConfig struct {
	Redis RedisConfig `mapstructure:"redis"`
}

type RedisConfig struct {
	Host     string `mapstructure:"host"`
	Port     int    `mapstructure:"port"`
	Password string `mapstructure:"password"`
	DB       int    `mapstructure:"db"`
	PoolSize int    `mapstructure:"pool_size"`
}

type QueueConfig struct {
	RabbitMQ RabbitMQConfig `mapstructure:"rabbitmq"`
}

type RabbitMQConfig struct {
	URL      string            `mapstructure:"url"`
	Exchange string            `mapstructure:"exchange"`
	Queues   map[string]string `mapstructure:"queues"`
}

type SearchConfig struct {
	Elasticsearch ElasticsearchConfig `mapstructure:"elasticsearch"`
}

type ElasticsearchConfig struct {
	URLs        []string `mapstructure:"urls"`
	Username    string   `mapstructure:"username"`
	Password    string   `mapstructure:"password"`
	IndexPrefix string   `mapstructure:"index_prefix"`
}

type AuthConfig struct {
	JWT JWTConfig `mapstructure:"jwt"`
}

type JWTConfig struct {
	AccessSecret     string `mapstructure:"access_secret"`
	RefreshSecret    string `mapstructure:"refresh_secret"`
	AccessExpiresIn  int    `mapstructure:"access_expires_in"`
	RefreshExpiresIn int    `mapstructure:"refresh_expires_in"`
}

type AIConfig struct {
	OpenAI OpenAIConfig `mapstructure:"openai"`
}

type OpenAIConfig struct {
	APIKey    string `mapstructure:"api_key"`
	Model     string `mapstructure:"model"`
	MaxTokens int    `mapstructure:"max_tokens"`
}

type ScrapingConfig struct {
	UserAgent            string        `mapstructure:"user_agent"`
	Timeout              time.Duration `mapstructure:"timeout"`
	MaxRetries           int           `mapstructure:"max_retries"`
	DelayBetweenRequests time.Duration `mapstructure:"delay_between_requests"`
}

type LoggingConfig struct {
	Level  string        `mapstructure:"level"`
	Format string        `mapstructure:"format"`
	Output string        `mapstructure:"output"`
	File   LogFileConfig `mapstructure:"file"`
}

type LogFileConfig struct {
	Path       string `mapstructure:"path"`
	MaxSize    int    `mapstructure:"max_size"` // MB
	MaxBackups int    `mapstructure:"max_backups"`
	MaxAge     int    `mapstructure:"max_age"` // days
	Compress   bool   `mapstructure:"compress"`
}

type RateLimitConfig struct {
	RequestsPerMinute int `mapstructure:"requests_per_minute"`
	Burst             int `mapstructure:"burst"`
}

// LoadConfig loads configuration from file and environment variables
func LoadConfig(path string) (*Config, error) {
	viper.SetConfigName("config")
	viper.SetConfigType("yaml")
	viper.AddConfigPath(path)

	// Enable reading from environment variables
	viper.AutomaticEnv()

	// Read configuration file
	if err := viper.ReadInConfig(); err != nil {
		return nil, err
	}

	var config Config
	if err := viper.Unmarshal(&config); err != nil {
		return nil, err
	}

	return &config, nil
}