package server

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

	"git.fabledsword.com/bvandeusen/minstrel/internal/config"
	"git.fabledsword.com/bvandeusen/minstrel/internal/subsonic"
)

func TestHealthz(t *testing.T) {
	s := New(slog.New(slog.NewTextHandler(io.Discard, nil)), nil, nil, subsonic.Config{}, config.EventsConfig{})
	ts := httptest.NewServer(s.Router())
	defer ts.Close()

	resp, err := http.Get(ts.URL + "/healthz")
	if err != nil {
		t.Fatalf("GET /healthz: %v", err)
	}
	defer func() { _ = resp.Body.Close() }()

	if resp.StatusCode != http.StatusOK {
		t.Errorf("status = %d, want 200", resp.StatusCode)
	}
	var body map[string]string
	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if body["status"] != "ok" {
		t.Errorf("body = %v, want status=ok", body)
	}
}

func TestRouter_ServesSPAAtRoot(t *testing.T) {
	s := New(slog.New(slog.NewTextHandler(io.Discard, nil)), nil, nil, subsonic.Config{}, config.EventsConfig{})
	ts := httptest.NewServer(s.Router())
	defer ts.Close()

	resp, err := http.Get(ts.URL + "/")
	if err != nil {
		t.Fatalf("GET /: %v", err)
	}
	defer func() { _ = resp.Body.Close() }()

	if resp.StatusCode != http.StatusOK {
		t.Errorf("status = %d, want 200", resp.StatusCode)
	}
	if ct := resp.Header.Get("Content-Type"); !strings.Contains(ct, "text/html") {
		t.Errorf("Content-Type = %q, want text/html*", ct)
	}
}

func TestRouter_DeepLinkFallbackReturnsSPA(t *testing.T) {
	s := New(slog.New(slog.NewTextHandler(io.Discard, nil)), nil, nil, subsonic.Config{}, config.EventsConfig{})
	ts := httptest.NewServer(s.Router())
	defer ts.Close()

	resp, err := http.Get(ts.URL + "/artists/00000000-0000-0000-0000-000000000001")
	if err != nil {
		t.Fatalf("GET deep link: %v", err)
	}
	defer func() { _ = resp.Body.Close() }()

	if resp.StatusCode != http.StatusOK {
		t.Errorf("status = %d, want 200", resp.StatusCode)
	}
	if ct := resp.Header.Get("Content-Type"); !strings.Contains(ct, "text/html") {
		t.Errorf("Content-Type = %q, want text/html*", ct)
	}
}

func TestRouter_APIPathNotSwallowedBySPA(t *testing.T) {
	s := New(slog.New(slog.NewTextHandler(io.Discard, nil)), nil, nil, subsonic.Config{}, config.EventsConfig{})
	ts := httptest.NewServer(s.Router())
	defer ts.Close()

	resp, err := http.Get(ts.URL + "/api/does-not-exist")
	if err != nil {
		t.Fatalf("GET /api/does-not-exist: %v", err)
	}
	defer func() { _ = resp.Body.Close() }()

	if resp.StatusCode != http.StatusNotFound {
		t.Errorf("status = %d, want 404", resp.StatusCode)
	}
	if ct := resp.Header.Get("Content-Type"); strings.Contains(ct, "text/html") {
		t.Errorf("Content-Type = %q; /api/* must never return text/html", ct)
	}
}

func TestRouter_RestPathNotSwallowedBySPA(t *testing.T) {
	s := New(slog.New(slog.NewTextHandler(io.Discard, nil)), nil, nil, subsonic.Config{}, config.EventsConfig{})
	ts := httptest.NewServer(s.Router())
	defer ts.Close()

	resp, err := http.Get(ts.URL + "/rest/does-not-exist")
	if err != nil {
		t.Fatalf("GET /rest/does-not-exist: %v", err)
	}
	defer func() { _ = resp.Body.Close() }()

	if resp.StatusCode != http.StatusNotFound {
		t.Errorf("status = %d, want 404", resp.StatusCode)
	}
	if ct := resp.Header.Get("Content-Type"); strings.Contains(ct, "text/html") {
		t.Errorf("Content-Type = %q; /rest/* must never return text/html", ct)
	}
}