package cli

import (
	"bytes"
	"context"
	"os"
	"strings"
	"testing"

	"email-mcp/internal/secretstore"
)

func TestInteractiveConfigPrompterPromptCredentialCollectsValues(t *testing.T) {
	input := strings.NewReader("imap.example.com\nalice\nsecret\n")
	output := &bytes.Buffer{}
	prompter := NewInteractiveConfigPrompter(input, output)

	cred, err := prompter.PromptCredential(context.Background(), secretstore.Credential{}, false)
	if err != nil {
		t.Fatalf("PromptCredential returned error: %v", err)
	}

	if cred.Host != "imap.example.com" || cred.Username != "alice" || cred.Password != "secret" {
		t.Fatalf("unexpected credential: %#v", cred)
	}
	if got := output.String(); got != "IMAP host: Username: Password: " {
		t.Fatalf("unexpected prompts: %q", got)
	}
}

func TestInteractiveConfigPrompterPromptCredentialKeepsStoredPassword(t *testing.T) {
	input := strings.NewReader("imap.example.com\nalice\n\n")
	output := &bytes.Buffer{}
	prompter := NewInteractiveConfigPrompter(input, output)

	cred, err := prompter.PromptCredential(context.Background(), secretstore.Credential{
		Host:     "imap.example.com",
		Username: "alice",
		Password: "stored-secret",
	}, true)
	if err != nil {
		t.Fatalf("PromptCredential returned error: %v", err)
	}

	if cred.Password != "stored-secret" {
		t.Fatalf("expected stored password to be preserved, got %q", cred.Password)
	}
	if got := output.String(); !strings.Contains(got, "Password [stored, leave blank to keep]: ") {
		t.Fatalf("unexpected prompts: %q", got)
	}
}

func TestInteractiveConfigPrompterPromptCredentialUsesSetupEngineWithFileInput(t *testing.T) {
	input := setupInputFile(t, "imap.example.com\nalice\nsecret\n")
	output := &bytes.Buffer{}
	prompter := NewInteractiveConfigPrompter(input, output)

	cred, err := prompter.PromptCredential(context.Background(), secretstore.Credential{}, false)
	if err != nil {
		t.Fatalf("PromptCredential returned error: %v", err)
	}

	if cred.Host != "imap.example.com" || cred.Username != "alice" || cred.Password != "secret" {
		t.Fatalf("unexpected credential: %#v", cred)
	}
	if got := output.String(); got != "IMAP host: Username: Password: " {
		t.Fatalf("unexpected prompts: %q", got)
	}
}

func TestInteractiveConfigPrompterPromptCredentialKeepsStoredPasswordWithSetupEngine(t *testing.T) {
	input := setupInputFile(t, "imap.example.com\nalice\n\n")
	output := &bytes.Buffer{}
	prompter := NewInteractiveConfigPrompter(input, output)

	cred, err := prompter.PromptCredential(context.Background(), secretstore.Credential{
		Host:     "imap.example.com",
		Username: "alice",
		Password: "stored-secret",
	}, true)
	if err != nil {
		t.Fatalf("PromptCredential returned error: %v", err)
	}

	if cred.Password != "stored-secret" {
		t.Fatalf("expected stored password to be preserved, got %q", cred.Password)
	}
	if got := output.String(); !strings.Contains(got, "Password [stored, leave blank to keep]: ") {
		t.Fatalf("unexpected prompts: %q", got)
	}
}

func setupInputFile(t *testing.T, content string) *os.File {
	t.Helper()

	input, err := os.CreateTemp(t.TempDir(), "setup-input-*.txt")
	if err != nil {
		t.Fatalf("CreateTemp returned error: %v", err)
	}
	t.Cleanup(func() {
		_ = input.Close()
	})

	if _, err := input.WriteString(content); err != nil {
		t.Fatalf("WriteString returned error: %v", err)
	}
	if _, err := input.Seek(0, 0); err != nil {
		t.Fatalf("Seek returned error: %v", err)
	}

	return input
}