package campaign

import (
	"strings"
	"testing"
)

func TestSend_TransitionsDraftToRunning(t *testing.T) {
	f := newFakeListmonk(t)
	f.campaigns = []fakeCampaign{{ID: 1, Name: "launch", Status: "draft"}}
	lm := f.client()

	camp, err := Send(lm, "launch")
	if err != nil {
		t.Fatalf("Send: %v", err)
	}
	if camp.ID != 1 {
		t.Errorf("expected campaign id 1, got %d", camp.ID)
	}
	if f.campaigns[0].Status != "running" {
		t.Errorf("expected status running, got %q", f.campaigns[0].Status)
	}
}

func TestSend_TransitionsPausedToRunning(t *testing.T) {
	f := newFakeListmonk(t)
	f.campaigns = []fakeCampaign{{ID: 1, Name: "launch", Status: "paused"}}
	lm := f.client()

	if _, err := Send(lm, "launch"); err != nil {
		t.Fatalf("Send: %v", err)
	}
	if f.campaigns[0].Status != "running" {
		t.Errorf("expected status running, got %q", f.campaigns[0].Status)
	}
}

func TestSend_RefusesWhenAlreadyRunning(t *testing.T) {
	f := newFakeListmonk(t)
	f.campaigns = []fakeCampaign{{ID: 1, Name: "launch", Status: "running"}}
	lm := f.client()

	if _, err := Send(lm, "launch"); err == nil || !strings.Contains(err.Error(), "running") {
		t.Fatalf("expected a refusal mentioning 'running', got %v", err)
	}
	if f.campaigns[0].Status != "running" {
		t.Errorf("expected status to remain running, got %q", f.campaigns[0].Status)
	}
}

func TestSend_ErrorsWhenCampaignMissing(t *testing.T) {
	f := newFakeListmonk(t)
	lm := f.client()

	if _, err := Send(lm, "nonexistent"); err == nil || !strings.Contains(err.Error(), "run sync first") {
		t.Fatalf("expected a 'run sync first' error, got %v", err)
	}
}

func TestTest_SendsPreviewToGivenAddresses(t *testing.T) {
	f := newFakeListmonk(t)
	f.campaigns = []fakeCampaign{{ID: 1, Name: "launch", Status: "draft"}}
	lm := f.client()

	if err := Test(lm, "launch", []string{"me@example.com"}); err != nil {
		t.Fatalf("Test: %v", err)
	}
	if len(f.testCalls) != 1 || f.testCalls[0].CampaignID != 1 {
		t.Fatalf("expected 1 test call against campaign 1, got %+v", f.testCalls)
	}
}

func TestTest_ErrorsWhenCampaignMissing(t *testing.T) {
	f := newFakeListmonk(t)
	lm := f.client()

	if err := Test(lm, "nonexistent", []string{"me@example.com"}); err == nil || !strings.Contains(err.Error(), "run sync first") {
		t.Fatalf("expected a 'run sync first' error, got %v", err)
	}
}