package config

import (
	"fmt"
	"os"
	"strconv"
	"strings"

	"github.com/joho/godotenv"
)

type Config struct {
	GroqAPIKey           string
	GeminiAPIKey         string
	TelegramBotToken     string
	TelegramChatID       string
	LinkedInClientID     string
	LinkedInClientSecret string
	LinkedInAccessToken  string
	Workspace            string
	CropBottomPx         int
	CropRightPx          int
}

// Load reads .env (if present) then maps env vars to Config.
// Never panics — callers check with Validate.
func Load() *Config {
	_ = godotenv.Load() // silently ignore missing .env

	ws := os.Getenv("LDPOST_WORKSPACE")
	if ws == "" {
		ws = `C:\Textos-Linkedin`
	}

	return &Config{
		GroqAPIKey:           os.Getenv("GROQ_API_KEY"),
		GeminiAPIKey:         os.Getenv("GEMINI_API_KEY"),
		TelegramBotToken:     os.Getenv("TELEGRAM_BOT_TOKEN"),
		TelegramChatID:       os.Getenv("TELEGRAM_CHAT_ID"),
		LinkedInClientID:     os.Getenv("LINKEDIN_CLIENT_ID"),
		LinkedInClientSecret: os.Getenv("LINKEDIN_CLIENT_SECRET"),
		LinkedInAccessToken:  os.Getenv("LINKEDIN_ACCESS_TOKEN"),
		Workspace:            ws,
		CropBottomPx:         envInt("LDPOST_CROP_BOTTOM", 48),
		CropRightPx:          envInt("LDPOST_CROP_RIGHT", 48),
	}
}

func envInt(key string, def int) int {
	if v := os.Getenv(key); v != "" {
		if n, err := strconv.Atoi(v); err == nil {
			return n
		}
	}
	return def
}

// Validate checks named field groups and returns a combined error (nil = OK).
// Accepts: "groq", "gemini", "telegram", "linkedin", "workspace".
// Returns error listing ALL missing vars — does not panic, safe for dry-run.
func (c *Config) Validate(fields ...string) error {
	var missing []string

	check := func(name, val string) {
		if val == "" {
			missing = append(missing, name)
		}
	}

	for _, f := range fields {
		switch f {
		case "groq":
			check("GROQ_API_KEY", c.GroqAPIKey)
		case "gemini":
			check("GEMINI_API_KEY", c.GeminiAPIKey)
		case "telegram":
			check("TELEGRAM_BOT_TOKEN", c.TelegramBotToken)
			check("TELEGRAM_CHAT_ID", c.TelegramChatID)
		case "linkedin":
			check("LINKEDIN_ACCESS_TOKEN", c.LinkedInAccessToken)
		case "workspace":
			check("LDPOST_WORKSPACE", c.Workspace)
		}
	}

	if len(missing) == 0 {
		return nil
	}
	return fmt.Errorf("variáveis ausentes: %s", strings.Join(missing, ", "))
}