package custom

import (
	"io"
	"net/http"
	"testing"

	"github.com/TwiN/gatus/v3/alerting/alert"
	"github.com/TwiN/gatus/v3/client"
	"github.com/TwiN/gatus/v3/core"
	"github.com/TwiN/gatus/v3/test"
)

func TestAlertProvider_IsValid(t *testing.T) {
	invalidProvider := AlertProvider{URL: ""}
	if invalidProvider.IsValid() {
		t.Error("provider shouldn't have been valid")
	}
	validProvider := AlertProvider{URL: "https://example.com"}
	if !validProvider.IsValid() {
		t.Error("provider should've been valid")
	}
}

func TestAlertProvider_Send(t *testing.T) {
	defer client.InjectHTTPClient(nil)
	firstDescription := "description-1"
	secondDescription := "description-2"
	scenarios := []struct {
		Name             string
		Provider         AlertProvider
		Alert            alert.Alert
		Resolved         bool
		MockRoundTripper test.MockRoundTripper
		ExpectedError    bool
	}{
		{
			Name:     "triggered",
			Provider: AlertProvider{},
			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
			Resolved: false,
			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
			}),
			ExpectedError: false,
		},
		{
			Name:     "triggered-error",
			Provider: AlertProvider{},
			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
			Resolved: false,
			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
			}),
			ExpectedError: true,
		},
		{
			Name:     "resolved",
			Provider: AlertProvider{},
			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
			Resolved: true,
			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
			}),
			ExpectedError: false,
		},
		{
			Name:     "resolved-error",
			Provider: AlertProvider{},
			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
			Resolved: true,
			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
			}),
			ExpectedError: true,
		},
	}
	for _, scenario := range scenarios {
		t.Run(scenario.Name, func(t *testing.T) {
			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
			err := scenario.Provider.Send(
				&core.Endpoint{Name: "endpoint-name"},
				&scenario.Alert,
				&core.Result{
					ConditionResults: []*core.ConditionResult{
						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
					},
				},
				scenario.Resolved,
			)
			if scenario.ExpectedError && err == nil {
				t.Error("expected error, got none")
			}
			if !scenario.ExpectedError && err != nil {
				t.Error("expected no error, got", err.Error())
			}
		})
	}
}

func TestAlertProvider_buildHTTPRequestWhenResolved(t *testing.T) {
	const (
		ExpectedURL  = "https://example.com/endpoint-name?event=RESOLVED&description=alert-description"
		ExpectedBody = "endpoint-name,alert-description,RESOLVED"
	)
	customAlertProvider := &AlertProvider{
		URL:     "https://example.com/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
		Body:    "[ENDPOINT_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
		Headers: nil,
	}
	request := customAlertProvider.buildHTTPRequest("endpoint-name", "alert-description", true)
	if request.URL.String() != ExpectedURL {
		t.Error("expected URL to be", ExpectedURL, "was", request.URL.String())
	}
	body, _ := io.ReadAll(request.Body)
	if string(body) != ExpectedBody {
		t.Error("expected body to be", ExpectedBody, "was", string(body))
	}
}

func TestAlertProvider_buildHTTPRequestWhenTriggered(t *testing.T) {
	const (
		ExpectedURL  = "https://example.com/endpoint-name?event=TRIGGERED&description=alert-description"
		ExpectedBody = "endpoint-name,alert-description,TRIGGERED"
	)
	customAlertProvider := &AlertProvider{
		URL:     "https://example.com/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
		Body:    "[ENDPOINT_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
		Headers: map[string]string{"Authorization": "Basic hunter2"},
	}
	request := customAlertProvider.buildHTTPRequest("endpoint-name", "alert-description", false)
	if request.URL.String() != ExpectedURL {
		t.Error("expected URL to be", ExpectedURL, "was", request.URL.String())
	}
	body, _ := io.ReadAll(request.Body)
	if string(body) != ExpectedBody {
		t.Error("expected body to be", ExpectedBody, "was", string(body))
	}
}

func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
	const (
		ExpectedURL  = "https://example.com/endpoint-name?event=test&description=alert-description"
		ExpectedBody = "endpoint-name,alert-description,test"
	)
	customAlertProvider := &AlertProvider{
		URL:     "https://example.com/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
		Body:    "[ENDPOINT_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
		Headers: nil,
		Placeholders: map[string]map[string]string{
			"ALERT_TRIGGERED_OR_RESOLVED": {
				"RESOLVED": "test",
			},
		},
	}
	request := customAlertProvider.buildHTTPRequest("endpoint-name", "alert-description", true)
	if request.URL.String() != ExpectedURL {
		t.Error("expected URL to be", ExpectedURL, "was", request.URL.String())
	}
	body, _ := io.ReadAll(request.Body)
	if string(body) != ExpectedBody {
		t.Error("expected body to be", ExpectedBody, "was", string(body))
	}
}

func TestAlertProvider_GetAlertStatePlaceholderValueDefaults(t *testing.T) {
	customAlertProvider := &AlertProvider{
		URL:          "https://example.com/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
		Body:         "[ENDPOINT_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
		Headers:      nil,
		Placeholders: nil,
	}
	if customAlertProvider.GetAlertStatePlaceholderValue(true) != "RESOLVED" {
		t.Error("expected RESOLVED, got", customAlertProvider.GetAlertStatePlaceholderValue(true))
	}
	if customAlertProvider.GetAlertStatePlaceholderValue(false) != "TRIGGERED" {
		t.Error("expected TRIGGERED, got", customAlertProvider.GetAlertStatePlaceholderValue(false))
	}
}

func TestAlertProvider_GetDefaultAlert(t *testing.T) {
	if (AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
		t.Error("expected default alert to be not nil")
	}
	if (AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
		t.Error("expected default alert to be nil")
	}
}

// TestAlertProvider_isBackwardCompatibleWithServiceRename checks if the custom alerting provider still supports
// service placeholders after the migration from "service" to "endpoint"
//
// XXX: Remove this in v4.0.0
func TestAlertProvider_isBackwardCompatibleWithServiceRename(t *testing.T) {
	const (
		ExpectedURL  = "https://example.com/endpoint-name?event=TRIGGERED&description=alert-description"
		ExpectedBody = "endpoint-name,alert-description,TRIGGERED"
	)
	customAlertProvider := &AlertProvider{
		URL:  "https://example.com/[SERVICE_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
		Body: "[SERVICE_NAME],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
	}
	request := customAlertProvider.buildHTTPRequest("endpoint-name", "alert-description", false)
	if request.URL.String() != ExpectedURL {
		t.Error("expected URL to be", ExpectedURL, "was", request.URL.String())
	}
	body, _ := io.ReadAll(request.Body)
	if string(body) != ExpectedBody {
		t.Error("expected body to be", ExpectedBody, "was", string(body))
	}
}