package config

import (
	"fmt"
	"io/ioutil"
	"os"
	"strconv"
	"strings"
	"time"
)

// This is a container-adapted version of CHORUS's config system
// All configuration comes from environment variables instead of YAML files

// Config represents the complete CHORUS configuration loaded from environment variables
type Config struct {
	Agent     AgentConfig     `yaml:"agent"`
	Network   NetworkConfig   `yaml:"network"`
	License   LicenseConfig   `yaml:"license"`
	AI        AIConfig        `yaml:"ai"`
	Logging   LoggingConfig   `yaml:"logging"`
	V2        V2Config        `yaml:"v2"`
	UCXL      UCXLConfig      `yaml:"ucxl"`
	Slurp     SlurpConfig     `yaml:"slurp"`
	Security  SecurityConfig  `yaml:"security"`
	WHOOSHAPI WHOOSHAPIConfig `yaml:"whoosh_api"`
}

// AgentConfig defines agent-specific settings
type AgentConfig struct {
	ID                    string   `yaml:"id"`
	Specialization        string   `yaml:"specialization"`
	MaxTasks              int      `yaml:"max_tasks"`
	Capabilities          []string `yaml:"capabilities"`
	Models                []string `yaml:"models"`
	Role                  string   `yaml:"role"`
	Project               string   `yaml:"project"`
	Expertise             []string `yaml:"expertise"`
	ReportsTo             string   `yaml:"reports_to"`
	Deliverables          []string `yaml:"deliverables"`
	ModelSelectionWebhook string   `yaml:"model_selection_webhook"`
	DefaultReasoningModel string   `yaml:"default_reasoning_model"`
}

// NetworkConfig defines network and API settings
type NetworkConfig struct {
	P2PPort    int    `yaml:"p2p_port"`
	APIPort    int    `yaml:"api_port"`
	HealthPort int    `yaml:"health_port"`
	BindAddr   string `yaml:"bind_address"`
}

// LicenseConfig defines licensing settings (adapted from CHORUS)
type LicenseConfig struct {
	LicenseID        string    `yaml:"license_id"`
	ClusterID        string    `yaml:"cluster_id"`
	OrganizationName string    `yaml:"organization_name"`
	KachingURL       string    `yaml:"kaching_url"`
	IsActive         bool      `yaml:"is_active"`
	LastValidated    time.Time `yaml:"last_validated"`
	GracePeriodHours int       `yaml:"grace_period_hours"`
	LicenseType      string    `yaml:"license_type"`
	ExpiresAt        time.Time `yaml:"expires_at"`
	MaxNodes         int       `yaml:"max_nodes"`
}

// AIConfig defines AI service settings
type AIConfig struct {
	Provider  string          `yaml:"provider"`
	Ollama    OllamaConfig    `yaml:"ollama"`
	ResetData ResetDataConfig `yaml:"resetdata"`
}

// OllamaConfig defines Ollama-specific settings
type OllamaConfig struct {
	Endpoint string        `yaml:"endpoint"`
	Timeout  time.Duration `yaml:"timeout"`
}

// ResetDataConfig defines ResetData LLM service settings
type ResetDataConfig struct {
	BaseURL string        `yaml:"base_url"`
	APIKey  string        `yaml:"api_key"`
	Model   string        `yaml:"model"`
	Timeout time.Duration `yaml:"timeout"`
}

// LoggingConfig defines logging settings
type LoggingConfig struct {
	Level  string `yaml:"level"`
	Format string `yaml:"format"`
}

// V2Config defines v2-specific settings (from CHORUS)
type V2Config struct {
	DHT DHTConfig `yaml:"dht"`
}

// DHTConfig defines DHT settings
type DHTConfig struct {
	Enabled        bool     `yaml:"enabled"`
	BootstrapPeers []string `yaml:"bootstrap_peers"`
}

// UCXLConfig defines UCXL protocol settings
type UCXLConfig struct {
	Enabled    bool             `yaml:"enabled"`
	Server     ServerConfig     `yaml:"server"`
	Storage    StorageConfig    `yaml:"storage"`
	Resolution ResolutionConfig `yaml:"resolution"`
}

// ServerConfig defines server settings
type ServerConfig struct {
	Enabled  bool   `yaml:"enabled"`
	Port     int    `yaml:"port"`
	BasePath string `yaml:"base_path"`
}

// StorageConfig defines storage settings
type StorageConfig struct {
	Directory string `yaml:"directory"`
}

// ResolutionConfig defines resolution settings
type ResolutionConfig struct {
	CacheTTL time.Duration `yaml:"cache_ttl"`
}

// SlurpConfig defines SLURP settings
type SlurpConfig struct {
	Enabled bool `yaml:"enabled"`
}

// WHOOSHAPIConfig defines WHOOSH API integration settings
type WHOOSHAPIConfig struct {
	URL     string `yaml:"url"`
	BaseURL string `yaml:"base_url"`
	Token   string `yaml:"token"`
	Enabled bool   `yaml:"enabled"`
}

// LoadFromEnvironment loads configuration from environment variables
func LoadFromEnvironment() (*Config, error) {
	cfg := &Config{
		Agent: AgentConfig{
			ID:                    getEnvOrDefault("CHORUS_AGENT_ID", ""),
			Specialization:        getEnvOrDefault("CHORUS_SPECIALIZATION", "general_developer"),
			MaxTasks:              getEnvIntOrDefault("CHORUS_MAX_TASKS", 3),
			Capabilities:          getEnvArrayOrDefault("CHORUS_CAPABILITIES", []string{"general_development", "task_coordination"}),
			Models:                getEnvArrayOrDefault("CHORUS_MODELS", []string{"meta/llama-3.1-8b-instruct"}),
			Role:                  getEnvOrDefault("CHORUS_ROLE", ""),
			Project:               getEnvOrDefault("CHORUS_PROJECT", "chorus"),
			Expertise:             getEnvArrayOrDefault("CHORUS_EXPERTISE", []string{}),
			ReportsTo:             getEnvOrDefault("CHORUS_REPORTS_TO", ""),
			Deliverables:          getEnvArrayOrDefault("CHORUS_DELIVERABLES", []string{}),
			ModelSelectionWebhook: getEnvOrDefault("CHORUS_MODEL_SELECTION_WEBHOOK", ""),
			DefaultReasoningModel: getEnvOrDefault("CHORUS_DEFAULT_REASONING_MODEL", "meta/llama-3.1-8b-instruct"),
		},
		Network: NetworkConfig{
			P2PPort:    getEnvIntOrDefault("CHORUS_P2P_PORT", 9000),
			APIPort:    getEnvIntOrDefault("CHORUS_API_PORT", 8080),
			HealthPort: getEnvIntOrDefault("CHORUS_HEALTH_PORT", 8081),
			BindAddr:   getEnvOrDefault("CHORUS_BIND_ADDRESS", "0.0.0.0"),
		},
		License: LicenseConfig{
			LicenseID:        getEnvOrFileContent("CHORUS_LICENSE_ID", "CHORUS_LICENSE_ID_FILE"),
			ClusterID:        getEnvOrDefault("CHORUS_CLUSTER_ID", "default-cluster"),
			OrganizationName: getEnvOrDefault("CHORUS_ORGANIZATION_NAME", ""),
			KachingURL:       getEnvOrDefault("CHORUS_KACHING_URL", "https://kaching.chorus.services"),
			IsActive:         false, // Will be set during validation
			GracePeriodHours: getEnvIntOrDefault("CHORUS_GRACE_PERIOD_HOURS", 72),
		},
		AI: AIConfig{
			Provider: getEnvOrDefault("CHORUS_AI_PROVIDER", "resetdata"),
			Ollama: OllamaConfig{
				Endpoint: getEnvOrDefault("OLLAMA_ENDPOINT", "http://localhost:11434"),
				Timeout:  getEnvDurationOrDefault("OLLAMA_TIMEOUT", 30*time.Second),
			},
			ResetData: ResetDataConfig{
				BaseURL: getEnvOrDefault("RESETDATA_BASE_URL", "https://models.au-syd.resetdata.ai/v1"),
				APIKey:  os.Getenv("RESETDATA_API_KEY"),
				Model:   getEnvOrDefault("RESETDATA_MODEL", "meta/llama-3.1-8b-instruct"),
				Timeout: getEnvDurationOrDefault("RESETDATA_TIMEOUT", 30*time.Second),
			},
		},
		Logging: LoggingConfig{
			Level:  getEnvOrDefault("LOG_LEVEL", "info"),
			Format: getEnvOrDefault("LOG_FORMAT", "structured"),
		},
		V2: V2Config{
			DHT: DHTConfig{
				Enabled:        getEnvBoolOrDefault("CHORUS_DHT_ENABLED", true),
				BootstrapPeers: getEnvArrayOrDefault("CHORUS_BOOTSTRAP_PEERS", []string{}),
			},
		},
		UCXL: UCXLConfig{
			Enabled: getEnvBoolOrDefault("CHORUS_UCXL_ENABLED", true),
			Server: ServerConfig{
				Enabled:  getEnvBoolOrDefault("CHORUS_UCXL_SERVER_ENABLED", true),
				Port:     getEnvIntOrDefault("CHORUS_UCXL_SERVER_PORT", 8082),
				BasePath: getEnvOrDefault("CHORUS_UCXL_SERVER_BASE_PATH", ""),
			},
			Storage: StorageConfig{
				Directory: getEnvOrDefault("CHORUS_UCXL_STORAGE_DIRECTORY", "/tmp/chorus-ucxi-storage"),
			},
			Resolution: ResolutionConfig{
				CacheTTL: getEnvDurationOrDefault("CHORUS_UCXL_CACHE_TTL", 1*time.Hour),
			},
		},
		Slurp: SlurpConfig{
			Enabled: getEnvBoolOrDefault("CHORUS_SLURP_ENABLED", false),
		},
		Security: SecurityConfig{
			KeyRotationDays: getEnvIntOrDefault("CHORUS_KEY_ROTATION_DAYS", 30),
			AuditLogging:    getEnvBoolOrDefault("CHORUS_AUDIT_LOGGING", true),
			AuditPath:       getEnvOrDefault("CHORUS_AUDIT_PATH", "/tmp/chorus-audit.log"),
			ElectionConfig: ElectionConfig{
				DiscoveryTimeout: getEnvDurationOrDefault("CHORUS_DISCOVERY_TIMEOUT", 10*time.Second),
				HeartbeatTimeout: getEnvDurationOrDefault("CHORUS_HEARTBEAT_TIMEOUT", 30*time.Second),
				ElectionTimeout:  getEnvDurationOrDefault("CHORUS_ELECTION_TIMEOUT", 60*time.Second),
				DiscoveryBackoff: getEnvDurationOrDefault("CHORUS_DISCOVERY_BACKOFF", 5*time.Second),
				LeadershipScoring: &LeadershipScoring{
					UptimeWeight:     0.4,
					CapabilityWeight: 0.3,
					ExperienceWeight: 0.2,
					LoadWeight:       0.1,
				},
			},
		},
		WHOOSHAPI: WHOOSHAPIConfig{
			URL:     getEnvOrDefault("WHOOSH_API_URL", "http://localhost:3000"),
			BaseURL: getEnvOrDefault("WHOOSH_API_BASE_URL", "http://localhost:3000"),
			Token:   os.Getenv("WHOOSH_API_TOKEN"),
			Enabled: getEnvBoolOrDefault("WHOOSH_API_ENABLED", false),
		},
	}

	// Validate required configuration
	if err := cfg.Validate(); err != nil {
		return nil, fmt.Errorf("configuration validation failed: %w", err)
	}

	return cfg, nil
}

// Validate ensures all required configuration is present
func (c *Config) Validate() error {
	if c.License.LicenseID == "" {
		return fmt.Errorf("CHORUS_LICENSE_ID is required")
	}

	if c.Agent.ID == "" {
		// Auto-generate agent ID if not provided
		hostname, _ := os.Hostname()
		containerID := os.Getenv("HOSTNAME") // Docker sets this to container ID
		if containerID != "" && containerID != hostname {
			c.Agent.ID = fmt.Sprintf("chorus-%s", containerID[:12])
		} else {
			c.Agent.ID = fmt.Sprintf("chorus-%s", hostname)
		}
	}

	return nil
}

// ApplyRoleDefinition applies role-based configuration (from CHORUS)
func (c *Config) ApplyRoleDefinition(role string) error {
	// This would contain the role definition logic from CHORUS
	c.Agent.Role = role
	return nil
}

// GetRoleAuthority returns the authority level for a role (from CHORUS)
func (c *Config) GetRoleAuthority(role string) (string, error) {
	// This would contain the authority mapping from CHORUS
	switch role {
	case "admin":
		return "master", nil
	default:
		return "member", nil
	}
}

// Helper functions for environment variable parsing

func getEnvOrDefault(key, defaultValue string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return defaultValue
}

func getEnvIntOrDefault(key string, defaultValue int) int {
	if value := os.Getenv(key); value != "" {
		if parsed, err := strconv.Atoi(value); err == nil {
			return parsed
		}
	}
	return defaultValue
}

func getEnvBoolOrDefault(key string, defaultValue bool) bool {
	if value := os.Getenv(key); value != "" {
		if parsed, err := strconv.ParseBool(value); err == nil {
			return parsed
		}
	}
	return defaultValue
}

func getEnvDurationOrDefault(key string, defaultValue time.Duration) time.Duration {
	if value := os.Getenv(key); value != "" {
		if parsed, err := time.ParseDuration(value); err == nil {
			return parsed
		}
	}
	return defaultValue
}

func getEnvArrayOrDefault(key string, defaultValue []string) []string {
	if value := os.Getenv(key); value != "" {
		return strings.Split(value, ",")
	}
	return defaultValue
}

// getEnvOrFileContent reads from environment variable or file (for Docker secrets support)
func getEnvOrFileContent(envKey, fileEnvKey string) string {
	// First try the direct environment variable
	if value := os.Getenv(envKey); value != "" {
		return value
	}

	// Then try reading from file path specified in fileEnvKey
	if filePath := os.Getenv(fileEnvKey); filePath != "" {
		if content, err := ioutil.ReadFile(filePath); err == nil {
			return strings.TrimSpace(string(content))
		}
	}

	return ""
}

// IsSetupRequired checks if setup is required (always false for containers)
func IsSetupRequired(configPath string) bool {
	return false // Containers are always pre-configured via environment
}

// IsValidConfiguration validates configuration (simplified for containers)
func IsValidConfiguration(cfg *Config) bool {
	return cfg.License.LicenseID != "" && cfg.License.ClusterID != ""
}

// LoadConfig loads configuration from file (for API compatibility)
func LoadConfig(configPath string) (*Config, error) {
	// For containers, always load from environment
	return LoadFromEnvironment()
}

// SaveConfig saves configuration to file (stub for API compatibility)
func SaveConfig(cfg *Config, configPath string) error {
	// For containers, configuration is environment-based, so this is a no-op
	return nil
}