package server

import (
	"encoding/json"
	"io"
	"log/slog"
	"maps"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestHealth(t *testing.T) {
	t.Parallel()

	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
	srv := httptest.NewServer(NewRouter(logger, "1.2.3"))
	t.Cleanup(srv.Close)

	resp, err := http.Get(srv.URL + "/health")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		t.Errorf("status = %d, want 200", resp.StatusCode)
	}
	if ct := resp.Header.Get("Content-Type"); ct != "application/json" {
		t.Errorf("Content-Type = %q, want application/json", ct)
	}
	var got map[string]string
	if err := json.NewDecoder(resp.Body).Decode(&got); err != nil {
		t.Fatal(err)
	}
	want := map[string]string{"status": "ok", "version": "1.2.3"}
	if len(got) != len(want) || got["status"] != want["status"] || got["version"] != want["version"] {
		t.Errorf("body = %v, want %v", got, want)
	}
}

func TestHealthRejectsOtherMethods(t *testing.T) {
	t.Parallel()

	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
	rec := httptest.NewRecorder()
	NewRouter(logger, "dev").ServeHTTP(rec, httptest.NewRequest(http.MethodPost, "/health", nil))

	if rec.Code != http.StatusMethodNotAllowed {
		t.Errorf("status = %d, want 405", rec.Code)
	}
	if ct := rec.Header().Get("Content-Type"); ct != "application/json" {
		t.Errorf("Content-Type = %q, want application/json", ct)
	}
	var got struct {
		Error map[string]any `json:"error"`
	}
	if err := json.NewDecoder(rec.Body).Decode(&got); err != nil {
		t.Fatal(err)
	}
	want := map[string]any{
		"code":      "method_not_allowed",
		"message":   "method not allowed",
		"retryable": false,
	}
	if !maps.Equal(got.Error, want) {
		t.Errorf("error body = %v, want %v", got.Error, want)
	}
}

func TestUnknownPathNotFound(t *testing.T) {
	t.Parallel()

	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
	rec := httptest.NewRecorder()
	NewRouter(logger, "dev").ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/unknown", nil))

	if rec.Code != http.StatusNotFound {
		t.Errorf("status = %d, want 404", rec.Code)
	}
	if ct := rec.Header().Get("Content-Type"); ct != "application/json" {
		t.Errorf("Content-Type = %q, want application/json", ct)
	}
	const want = `{"error":{"code":"not_found","message":"not found","retryable":false}}`
	if got := rec.Body.String(); got != want {
		t.Errorf("body = %s, want %s", got, want)
	}
}