package http

import (
	"context"
	"errors"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"gitea.nik4nao.com/nik/home-services/alert-bridge/internal/core/domain"
)

type fakeAlertHandler struct {
	handleFn func(ctx context.Context, alert domain.Alert) error
	got      domain.Alert
	called   bool
}

func (f *fakeAlertHandler) Handle(ctx context.Context, alert domain.Alert) error {
	f.called = true
	f.got = alert
	if f.handleFn != nil {
		return f.handleFn(ctx, alert)
	}
	return nil
}

func doRequest(h *Handler, apiKey, body string) *httptest.ResponseRecorder {
	req := httptest.NewRequest(http.MethodPost, "/alerts", strings.NewReader(body))
	if apiKey != "" {
		req.Header.Set("Authorization", "Bearer "+apiKey)
	}
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	return rec
}

func TestHandler_Unauthorized(t *testing.T) {
	fake := &fakeAlertHandler{}
	h := NewHandler(fake, "secret")

	rec := doRequest(h, "wrong-key", `{"source":"x","message":"y"}`)
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401, got %d", rec.Code)
	}
	if fake.called {
		t.Fatal("app should not be called when unauthorized")
	}
}

func TestHandler_MissingAuthHeader(t *testing.T) {
	fake := &fakeAlertHandler{}
	h := NewHandler(fake, "secret")

	req := httptest.NewRequest(http.MethodPost, "/alerts", strings.NewReader(`{"source":"x","message":"y"}`))
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401, got %d", rec.Code)
	}
}

func TestHandler_BadJSON(t *testing.T) {
	fake := &fakeAlertHandler{}
	h := NewHandler(fake, "secret")

	rec := doRequest(h, "secret", `not json`)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", rec.Code)
	}
}

func TestHandler_MissingFields(t *testing.T) {
	fake := &fakeAlertHandler{}
	h := NewHandler(fake, "secret")

	rec := doRequest(h, "secret", `{"source":"","message":""}`)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", rec.Code)
	}
}

func TestHandler_InvalidLevel(t *testing.T) {
	fake := &fakeAlertHandler{}
	h := NewHandler(fake, "secret")

	rec := doRequest(h, "secret", `{"source":"x","message":"y","level":"critical"}`)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", rec.Code)
	}
}

func TestHandler_DefaultsLevelToInfo(t *testing.T) {
	fake := &fakeAlertHandler{}
	h := NewHandler(fake, "secret")

	rec := doRequest(h, "secret", `{"source":"ba-cronjob","message":"Started"}`)
	if rec.Code != http.StatusAccepted {
		t.Fatalf("expected 202, got %d", rec.Code)
	}
	if fake.got.Level != domain.LevelInfo {
		t.Fatalf("expected default level info, got %q", fake.got.Level)
	}
	if fake.got.Source != "ba-cronjob" || fake.got.Message != "Started" {
		t.Fatalf("unexpected alert passed through: %+v", fake.got)
	}
}

func TestHandler_NotifierFailure(t *testing.T) {
	fake := &fakeAlertHandler{handleFn: func(ctx context.Context, alert domain.Alert) error {
		return errors.New("discord unreachable")
	}}
	h := NewHandler(fake, "secret")

	rec := doRequest(h, "secret", `{"source":"x","message":"y","level":"error"}`)
	if rec.Code != http.StatusBadGateway {
		t.Fatalf("expected 502, got %d", rec.Code)
	}
}