package handlers

import (
	"net/http"
	"net/http/httptest"
	"testing"

	"gitea.leeworks.dev/0xwheatyz/gitea-mobile/internal/config"
	giteaclient "gitea.leeworks.dev/0xwheatyz/gitea-mobile/internal/gitea"
)

func newTestHandler() *Handler {
	cfg := &config.Config{
		GiteaURL:      "https://gitea.example.com",
		SessionSecret: "test-secret-that-is-at-least-32-chars-long",
		ListenAddr:    ":8080",
	}
	client := giteaclient.NewClient(cfg.GiteaURL)
	return NewHandler(cfg, client)
}

func TestHealth(t *testing.T) {
	h := newTestHandler()
	req := httptest.NewRequest(http.MethodGet, "/health", nil)
	w := httptest.NewRecorder()

	h.Health(w, req)

	if w.Code != http.StatusOK {
		t.Errorf("status = %d, want %d", w.Code, http.StatusOK)
	}
	if body := w.Body.String(); body != "ok\n" {
		t.Errorf("body = %q, want %q", body, "ok\n")
	}
}

func TestDashboard_NoToken(t *testing.T) {
	h := newTestHandler()
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	w := httptest.NewRecorder()

	h.Dashboard(w, req)

	if w.Code != http.StatusOK {
		t.Errorf("status = %d, want %d", w.Code, http.StatusOK)
	}
	// Without a token in context, should show "No organizations found."
	if body := w.Body.String(); body == "" {
		t.Error("expected non-empty response body")
	}
}

func TestDashboard_HTMX(t *testing.T) {
	h := newTestHandler()
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	req.Header.Set("HX-Request", "true")
	w := httptest.NewRecorder()

	h.Dashboard(w, req)

	// HTMX request should not include full HTML page wrapper.
	body := w.Body.String()
	if body == "" {
		t.Error("expected non-empty response body")
	}
	// Should NOT contain DOCTYPE for HTMX fragment.
	if contains(body, "<!DOCTYPE") {
		t.Error("HTMX response should not contain DOCTYPE")
	}
}

func TestIsHTMX(t *testing.T) {
	tests := []struct {
		header string
		want   bool
	}{
		{"true", true},
		{"false", false},
		{"", false},
	}

	for _, tt := range tests {
		req := httptest.NewRequest(http.MethodGet, "/", nil)
		if tt.header != "" {
			req.Header.Set("HX-Request", tt.header)
		}
		if got := isHTMX(req); got != tt.want {
			t.Errorf("isHTMX(HX-Request=%q) = %v, want %v", tt.header, got, tt.want)
		}
	}
}

func TestCreateIssue_MissingFields(t *testing.T) {
	h := newTestHandler()
	req := httptest.NewRequest(http.MethodPost, "/issues", nil)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	h.CreateIssue(w, req)

	if w.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want %d", w.Code, http.StatusBadRequest)
	}
}

func TestApplyLabels_InvalidIndex(t *testing.T) {
	h := newTestHandler()
	mux := http.NewServeMux()
	mux.HandleFunc("POST /issues/{owner}/{repo}/{index}/labels", h.ApplyLabels)

	req := httptest.NewRequest(http.MethodPost, "/issues/org/repo/abc/labels", nil)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	mux.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want %d", w.Code, http.StatusBadRequest)
	}
}

func TestSubmitReview_MissingEventType(t *testing.T) {
	h := newTestHandler()
	mux := http.NewServeMux()
	mux.HandleFunc("POST /pulls/{owner}/{repo}/{index}/review", h.SubmitReview)

	req := httptest.NewRequest(http.MethodPost, "/pulls/org/repo/1/review", nil)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	mux.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want %d", w.Code, http.StatusBadRequest)
	}
}

func TestSetIssueState_InvalidState(t *testing.T) {
	h := newTestHandler()
	mux := http.NewServeMux()
	mux.HandleFunc("POST /issues/{owner}/{repo}/{index}/state", h.SetIssueState)

	req := httptest.NewRequest(http.MethodPost, "/issues/org/repo/1/state", nil)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	mux.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want %d", w.Code, http.StatusBadRequest)
	}
}

func TestSetIssueState_InvalidIndex(t *testing.T) {
	h := newTestHandler()
	mux := http.NewServeMux()
	mux.HandleFunc("POST /issues/{owner}/{repo}/{index}/state", h.SetIssueState)

	req := httptest.NewRequest(http.MethodPost, "/issues/org/repo/abc/state", nil)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	mux.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want %d", w.Code, http.StatusBadRequest)
	}
}

func TestAddComment_EmptyBody(t *testing.T) {
	h := newTestHandler()
	mux := http.NewServeMux()
	mux.HandleFunc("POST /issues/{owner}/{repo}/{index}/comments", h.AddComment)

	req := httptest.NewRequest(http.MethodPost, "/issues/org/repo/1/comments", nil)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()

	mux.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want %d", w.Code, http.StatusBadRequest)
	}
}

func TestErrorNotFound(t *testing.T) {
	h := newTestHandler()
	req := httptest.NewRequest(http.MethodGet, "/nonexistent", nil)
	w := httptest.NewRecorder()

	h.ErrorNotFound(w, req)

	if w.Code != http.StatusNotFound {
		t.Errorf("status = %d, want %d", w.Code, http.StatusNotFound)
	}
	body := w.Body.String()
	if body == "" {
		t.Error("expected non-empty response body")
	}
	if !contains(body, "404") {
		t.Error("expected body to contain '404'")
	}
	if !contains(body, "Page Not Found") {
		t.Error("expected body to contain 'Page Not Found'")
	}
}

func TestErrorInternal(t *testing.T) {
	h := newTestHandler()
	req := httptest.NewRequest(http.MethodGet, "/error", nil)
	w := httptest.NewRecorder()

	h.ErrorInternal(w, req)

	if w.Code != http.StatusInternalServerError {
		t.Errorf("status = %d, want %d", w.Code, http.StatusInternalServerError)
	}
	body := w.Body.String()
	if body == "" {
		t.Error("expected non-empty response body")
	}
	if !contains(body, "500") {
		t.Error("expected body to contain '500'")
	}
	if !contains(body, "Internal Server Error") {
		t.Error("expected body to contain 'Internal Server Error'")
	}
}

func TestDashboard_NonRootPath_Returns404(t *testing.T) {
	h := newTestHandler()
	req := httptest.NewRequest(http.MethodGet, "/unknown/path", nil)
	w := httptest.NewRecorder()

	h.Dashboard(w, req)

	if w.Code != http.StatusNotFound {
		t.Errorf("status = %d, want %d", w.Code, http.StatusNotFound)
	}
	body := w.Body.String()
	if !contains(body, "404") {
		t.Error("expected body to contain '404' for non-root path")
	}
}

func TestErrorNotFound_HTMX(t *testing.T) {
	h := newTestHandler()
	req := httptest.NewRequest(http.MethodGet, "/nonexistent", nil)
	req.Header.Set("HX-Request", "true")
	w := httptest.NewRecorder()

	h.ErrorNotFound(w, req)

	if w.Code != http.StatusNotFound {
		t.Errorf("status = %d, want %d", w.Code, http.StatusNotFound)
	}
	body := w.Body.String()
	// HTMX response should not contain DOCTYPE.
	if contains(body, "<!DOCTYPE") {
		t.Error("HTMX response should not contain DOCTYPE")
	}
	if !contains(body, "Page Not Found") {
		t.Error("expected body to contain 'Page Not Found'")
	}
}

func contains(s, substr string) bool {
	return len(s) >= len(substr) && searchString(s, substr)
}

func searchString(s, substr string) bool {
	for i := 0; i <= len(s)-len(substr); i++ {
		if s[i:i+len(substr)] == substr {
			return true
		}
	}
	return false
}