package cli

import (
	"bufio"
	"fmt"
	"io"
	"net/url"
	"os"
	"strings"

	"golang.org/x/term"
)

type Candidate struct {
	Value  string
	Source string
}

func ResolveProfileName(flagProfile, envProfile, currentProfile string) string {
	for _, candidate := range []string{flagProfile, envProfile, currentProfile} {
		if value := strings.TrimSpace(candidate); value != "" {
			return value
		}
	}

	return "default"
}

func FirstNonEmpty(candidates ...Candidate) (string, string) {
	for _, candidate := range candidates {
		if value := strings.TrimSpace(candidate.Value); value != "" {
			return value, candidate.Source
		}
	}

	return "", ""
}

func ValidateBaseURL(raw string) error {
	parsed, err := url.Parse(raw)
	if err != nil {
		return fmt.Errorf("parse URL: %w", err)
	}
	if parsed.Scheme == "" || parsed.Host == "" {
		return fmt.Errorf("must include scheme and host")
	}
	return nil
}

func PromptLine(reader *bufio.Reader, w io.Writer, label, defaultValue string) (string, error) {
	if defaultValue != "" {
		fmt.Fprintf(w, "%s [%s]: ", label, defaultValue)
	} else {
		fmt.Fprintf(w, "%s: ", label)
	}

	line, err := reader.ReadString('\n')
	if err != nil && err != io.EOF {
		return "", err
	}

	line = strings.TrimSpace(line)
	if line == "" {
		return defaultValue, nil
	}
	return line, nil
}

func PromptSecret(stdin *os.File, w io.Writer, label string, hasStoredSecret bool, storedSecret string) (string, error) {
	if hasStoredSecret {
		fmt.Fprintf(w, "%s [stored, leave blank to keep]: ", label)
	} else {
		fmt.Fprintf(w, "%s: ", label)
	}

	if term.IsTerminal(int(stdin.Fd())) {
		secret, err := term.ReadPassword(int(stdin.Fd()))
		fmt.Fprintln(w)
		if err != nil {
			return "", err
		}

		value := strings.TrimSpace(string(secret))
		if value == "" && hasStoredSecret {
			return storedSecret, nil
		}
		return value, nil
	}

	reader := bufio.NewReader(stdin)
	line, err := reader.ReadString('\n')
	if err != nil && err != io.EOF {
		return "", err
	}

	value := strings.TrimSpace(line)
	if value == "" && hasStoredSecret {
		return storedSecret, nil
	}
	return value, nil
}