package config

import (
	"fmt"
	"os"

	"gopkg.in/yaml.v3"
)

type Config struct {
	Server  ServerConfig  `yaml:"server"`
	AI      AIConfig      `yaml:"ai"`
	Agent   AgentConfig   `yaml:"agent"`
	Tools   ToolsConfig   `yaml:"tools"`
	Logging LoggingConfig `yaml:"logging"`
}

type ServerConfig struct {
	Host string `yaml:"host"`
	Port int    `yaml:"port"`
}

type AIConfig struct {
	DefaultProvider string          `yaml:"default_provider"`
	Ollama          OllamaConfig    `yaml:"ollama"`
	OpenAI          OpenAIConfig    `yaml:"openai"`
	Anthropic       AnthropicConfig `yaml:"anthropic"`
	Google          GoogleConfig    `yaml:"google"`
}

type OllamaConfig struct {
	BaseURL string `yaml:"base_url"`
	Model   string `yaml:"model"`
}

type OpenAIConfig struct {
	APIKey  string `yaml:"api_key"`
	Model   string `yaml:"model"`
	BaseURL string `yaml:"base_url"`
}

type AnthropicConfig struct {
	APIKey  string `yaml:"api_key"`
	Model   string `yaml:"model"`
	BaseURL string `yaml:"base_url"`
}

type GoogleConfig struct {
	APIKey string `yaml:"api_key"`
	Model  string `yaml:"model"`
}

type AgentConfig struct {
	MaxIterations  int    `yaml:"max_iterations"`
	TimeoutSeconds int    `yaml:"timeout_seconds"`
	SystemPrompt   string `yaml:"system_prompt"`
}

type ToolsConfig struct {
	Terminal   TerminalToolConfig   `yaml:"terminal"`
	Browser    BrowserToolConfig    `yaml:"browser"`
	Desktop    DesktopToolConfig    `yaml:"desktop"`
	Filesystem FilesystemToolConfig `yaml:"filesystem"`
	Clipboard  ClipboardToolConfig  `yaml:"clipboard"`
}

type TerminalToolConfig struct {
	Enabled         bool     `yaml:"enabled"`
	Shell           string   `yaml:"shell"`
	TimeoutSeconds  int      `yaml:"timeout_seconds"`
	BlockedCommands []string `yaml:"blocked_commands"`
}

type BrowserToolConfig struct {
	Enabled  bool `yaml:"enabled"`
	Headless bool `yaml:"headless"`
}

type DesktopToolConfig struct {
	Enabled bool `yaml:"enabled"`
}

type FilesystemToolConfig struct {
	Enabled      bool     `yaml:"enabled"`
	AllowedPaths []string `yaml:"allowed_paths"`
}

type ClipboardToolConfig struct {
	Enabled bool `yaml:"enabled"`
}

type LoggingConfig struct {
	Level  string `yaml:"level"`
	Format string `yaml:"format"`
}

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

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

	cfg.applyEnvOverrides()
	cfg.setDefaults()

	return cfg, nil
}

func (c *Config) applyEnvOverrides() {
	if key := os.Getenv("OPENAI_API_KEY"); key != "" {
		c.AI.OpenAI.APIKey = key
	}
	if key := os.Getenv("ANTHROPIC_API_KEY"); key != "" {
		c.AI.Anthropic.APIKey = key
	}
	if key := os.Getenv("GOOGLE_API_KEY"); key != "" {
		c.AI.Google.APIKey = key
	}
	if url := os.Getenv("OLLAMA_BASE_URL"); url != "" {
		c.AI.Ollama.BaseURL = url
	}
}

func (c *Config) setDefaults() {
	if c.Server.Port == 0 {
		c.Server.Port = 8080
	}
	if c.Server.Host == "" {
		c.Server.Host = "0.0.0.0"
	}
	if c.AI.DefaultProvider == "" {
		c.AI.DefaultProvider = "ollama"
	}
	if c.AI.Ollama.BaseURL == "" {
		c.AI.Ollama.BaseURL = "http://localhost:11434"
	}
	if c.AI.Ollama.Model == "" {
		c.AI.Ollama.Model = "llama3"
	}
	if c.Agent.MaxIterations == 0 {
		c.Agent.MaxIterations = 20
	}
	if c.Agent.TimeoutSeconds == 0 {
		c.Agent.TimeoutSeconds = 300
	}
	if c.Tools.Terminal.Shell == "" {
		c.Tools.Terminal.Shell = "/bin/bash"
	}
	if c.Tools.Terminal.TimeoutSeconds == 0 {
		c.Tools.Terminal.TimeoutSeconds = 60
	}
	if c.Logging.Level == "" {
		c.Logging.Level = "info"
	}
	if c.Logging.Format == "" {
		c.Logging.Format = "text"
	}
}