package server

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"testing"

	"github.com/cnachtigall/heatwave-autopilot/internal/compute"
	"github.com/cnachtigall/heatwave-autopilot/internal/config"
)

func TestMain(m *testing.M) {
	// Tests run from the package directory. Set WebFS to point to web/ dir.
	WebFS = os.DirFS("../../web")
	os.Exit(m.Run())
}

func testServer(t *testing.T) *Server {
	t.Helper()
	s, err := New(Options{
		Port:    0,
		DevMode: false,
		Config:  config.DefaultConfig(),
	})
	if err != nil {
		t.Fatalf("create server: %v", err)
	}
	return s
}

func TestDashboardPage(t *testing.T) {
	s := testServer(t)
	req := httptest.NewRequest("GET", "/", nil)
	w := httptest.NewRecorder()
	s.Handler().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("got status %d, want 200; body: %s", w.Code, w.Body.String())
	}
	if ct := w.Header().Get("Content-Type"); ct != "text/html; charset=utf-8" {
		t.Errorf("got content-type %q, want text/html", ct)
	}
}

func TestSetupPage(t *testing.T) {
	s := testServer(t)
	req := httptest.NewRequest("GET", "/setup", nil)
	w := httptest.NewRecorder()
	s.Handler().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("got status %d, want 200; body: %s", w.Code, w.Body.String())
	}
}

func TestGuidePage(t *testing.T) {
	s := testServer(t)
	req := httptest.NewRequest("GET", "/guide", nil)
	w := httptest.NewRecorder()
	s.Handler().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("got status %d, want 200; body: %s", w.Code, w.Body.String())
	}
}

func TestNotFound(t *testing.T) {
	s := testServer(t)
	req := httptest.NewRequest("GET", "/nonexistent", nil)
	w := httptest.NewRecorder()
	s.Handler().ServeHTTP(w, req)
	if w.Code != http.StatusNotFound {
		t.Errorf("got status %d, want 404", w.Code)
	}
}

func TestLanguageDetection(t *testing.T) {
	s := testServer(t)

	req := httptest.NewRequest("GET", "/?lang=de", nil)
	w := httptest.NewRecorder()
	s.Handler().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("got status %d, want 200", w.Code)
	}
	body := w.Body.String()
	if !bytes.Contains([]byte(body), []byte(`lang="de"`)) {
		t.Error("expected lang=de in response")
	}

	cookies := w.Result().Cookies()
	found := false
	for _, c := range cookies {
		if c.Name == "heatguard_lang" && c.Value == "de" {
			found = true
		}
	}
	if !found {
		t.Error("expected heatguard_lang cookie to be set")
	}
}

func TestComputeAPI_NoForecasts(t *testing.T) {
	s := testServer(t)

	reqBody := compute.ComputeRequest{
		Profile: compute.Profile{Name: "Test", Timezone: "UTC"},
		Date:    "2025-07-15",
	}
	b, _ := json.Marshal(reqBody)

	req := httptest.NewRequest("POST", "/api/compute/dashboard", bytes.NewReader(b))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	s.Handler().ServeHTTP(w, req)
	if w.Code != http.StatusBadRequest {
		t.Errorf("got status %d, want 400", w.Code)
	}
}

func TestComputeAPI_MethodNotAllowed(t *testing.T) {
	s := testServer(t)
	req := httptest.NewRequest("GET", "/api/compute/dashboard", nil)
	w := httptest.NewRecorder()
	s.Handler().ServeHTTP(w, req)
	if w.Code != http.StatusMethodNotAllowed {
		t.Errorf("got status %d, want 405", w.Code)
	}
}

func TestLLMConfigAPI(t *testing.T) {
	s := testServer(t)
	req := httptest.NewRequest("GET", "/api/llm/config", nil)
	w := httptest.NewRecorder()
	s.Handler().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("got status %d, want 200", w.Code)
	}

	var resp struct {
		Provider  string `json:"provider"`
		Model     string `json:"model"`
		Available bool   `json:"available"`
	}
	json.NewDecoder(w.Body).Decode(&resp)
	if resp.Available {
		t.Errorf("expected available=false for noop provider, got provider=%q model=%q available=%v", resp.Provider, resp.Model, resp.Available)
	}
}

func TestLLMSummarize_Noop(t *testing.T) {
	s := testServer(t)
	body := `{"date":"2025-07-15","peakTempC":35,"riskLevel":"high"}`
	req := httptest.NewRequest("POST", "/api/llm/summarize", bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	s.Handler().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("got status %d, want 200", w.Code)
	}

	var resp map[string]string
	json.NewDecoder(w.Body).Decode(&resp)
	if resp["summary"] != "" {
		t.Errorf("expected empty summary for noop, got %q", resp["summary"])
	}
}