package ui

import (
	"encoding/json"
	"fmt"
	"os"
)

// LoadUI loads UI translations from a JSON file for the specified language
func LoadUI(lang string) (*UI, error) {
	if lang != "en" && lang != "es" {
		return nil, fmt.Errorf("unsupported language: %s", lang)
	}

	filename := fmt.Sprintf("data/ui-%s.json", lang)
	filepath, err := findDataFile(filename)
	if err != nil {
		return nil, err
	}

	data, err := os.ReadFile(filepath)
	if err != nil {
		return nil, fmt.Errorf("error reading file %s: %w", filename, err)
	}

	var uiData UI
	if err := json.Unmarshal(data, &uiData); err != nil {
		return nil, fmt.Errorf("error parsing JSON: %w", err)
	}

	return &uiData, nil
}

// findDataFile locates a data file by searching up the directory tree
func findDataFile(filename string) (string, error) {
	// Try current directory first
	if _, err := os.Stat(filename); err == nil {
		return filename, nil
	}

	// Try parent directories (for tests running from subdirectories)
	paths := []string{
		filename,               // Current dir
		"../" + filename,       // One level up
		"../../" + filename,    // Two levels up (for tests in internal/handlers)
		"../../../" + filename, // Three levels up
	}

	for _, path := range paths {
		if _, err := os.Stat(path); err == nil {
			return path, nil
		}
	}

	return "", fmt.Errorf("file not found: %s (searched: current dir, ../, ../../, ../../../)", filename)
}