package prompt

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

	"github.com/fatih/color"
)

var (
	cyan   = color.New(color.FgCyan).SprintFunc()
	green  = color.New(color.FgGreen).SprintFunc()
	yellow = color.New(color.FgYellow).SprintFunc()
	red    = color.New(color.FgRed).SprintFunc()
)

// Reader interface for testing
type Reader interface {
	ReadString(delim byte) (string, error)
}

// PromptString prompts for a string value
func PromptString(label string, defaultValue string, required bool) (string, error) {
	reader := bufio.NewReader(os.Stdin)
	return promptStringWithReader(reader, label, defaultValue, required)
}

func promptStringWithReader(reader Reader, label string, defaultValue string, required bool) (string, error) {
	for {
		prompt := fmt.Sprintf("%s", cyan(label))
		if defaultValue != "" {
			prompt += fmt.Sprintf(" [%s]", green(defaultValue))
		}
		prompt += ": "

		fmt.Print(prompt)

		input, err := reader.ReadString('\n')
		if err != nil {
			return "", err
		}

		input = strings.TrimSpace(input)

		// If input is empty, use default value
		if input == "" {
			if defaultValue != "" {
				// Echo the selected default value
				fullPrompt := fmt.Sprintf("%s [%s]: %s", cyan(label), green(defaultValue), defaultValue)
				fmt.Printf("\033[1A\r%s\n", fullPrompt)
				return defaultValue, nil
			}
			if required {
				fmt.Println(red("✗ This field is required"))
				continue
			}
			return "", nil
		}

		return input, nil
	}
}

// PromptInt prompts for an integer value
func PromptInt(label string, defaultValue int, required bool) (int, error) {
	reader := bufio.NewReader(os.Stdin)
	return promptIntWithReader(reader, label, defaultValue, required)
}

func promptIntWithReader(reader Reader, label string, defaultValue int, required bool) (int, error) {
	for {
		defaultStr := ""
		if defaultValue != 0 {
			defaultStr = strconv.Itoa(defaultValue)
		}

		prompt := fmt.Sprintf("%s", cyan(label))
		if defaultStr != "" {
			prompt += fmt.Sprintf(" [%s]", green(defaultStr))
		}
		prompt += ": "

		fmt.Print(prompt)

		input, err := reader.ReadString('\n')
		if err != nil {
			return 0, err
		}

		input = strings.TrimSpace(input)

		// If input is empty, use default value
		if input == "" {
			if defaultValue != 0 {
				// Echo the selected default value
				fullPrompt := fmt.Sprintf("%s [%s]: %s", cyan(label), green(defaultStr), defaultStr)
				fmt.Printf("\033[1A\r%s\n", fullPrompt)
				return defaultValue, nil
			}
			if required {
				fmt.Println(red("✗ This field is required"))
				continue
			}
			return 0, nil
		}

		// Parse integer
		value, err := strconv.Atoi(input)
		if err != nil {
			fmt.Println(red("✗ Please enter a valid number"))
			continue
		}

		return value, nil
	}
}

// ValidateDirectory checks if a directory exists or can be created
func ValidateDirectory(path string) error {
	// Check if path exists
	info, err := os.Stat(path)
	if err == nil {
		// Path exists, check if it's a directory
		if !info.IsDir() {
			return fmt.Errorf("path exists but is not a directory")
		}
		return nil
	}

	// Path doesn't exist, try to create it
	if os.IsNotExist(err) {
		if err := os.MkdirAll(path, 0755); err != nil {
			return fmt.Errorf("cannot create directory: %w", err)
		}
		return nil
	}

	return err
}

// PromptDirectory prompts for a directory path and validates it
func PromptDirectory(label string, defaultValue string, required bool) (string, error) {
	for {
		path, err := PromptString(label, defaultValue, required)
		if err != nil {
			return "", err
		}

		if path == "" && !required {
			return "", nil
		}

		// Validate directory
		if err := ValidateDirectory(path); err != nil {
			fmt.Printf("%s %s\n", red("✗"), err.Error())
			continue
		}

		return path, nil
	}
}

// PrintHeader prints a colored header
func PrintHeader(text string) {
	header := color.New(color.FgCyan, color.Bold)
	header.Println("\n" + text)
	header.Println(strings.Repeat("=", len(text)))
}

// PrintSuccess prints a success message
func PrintSuccess(text string) {
	fmt.Printf("%s %s\n", green("✓"), text)
}

// PrintError prints an error message
func PrintError(text string) {
	fmt.Printf("%s %s\n", red("✗"), text)
}

// PrintInfo prints an info message
func PrintInfo(text string) {
	fmt.Printf("%s %s\n", yellow("ℹ"), text)
}