package stdlib

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

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"modernc.org/quickjs"
	"reichard.io/poiesis/internal/functions"
)

func TestFetch(t *testing.T) {
	ctx := context.Background()
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		w.Header().Set("X-Custom-Header", "test-value")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`{"status":"ok","message":"Hello from httptest"}`))
	}))
	defer server.Close()

	result, err := Fetch(ctx, FetchArgs{Input: server.URL})
	require.NoError(t, err)

	assert.True(t, result.OK)
	assert.Equal(t, http.StatusOK, result.Status)
	assert.Contains(t, result.Body, "Hello from httptest")
	assert.Contains(t, result.Body, `"status":"ok"`)
	assert.Equal(t, "application/json", result.Headers["Content-Type"])
	assert.Equal(t, "test-value", result.Headers["X-Custom-Header"])
}

func TestFetchHTTPBin(t *testing.T) {
	t.Skip("httpbin.org test is flaky")
	ctx := context.Background()

	result, err := Fetch(ctx, FetchArgs{Input: "https://httpbin.org/get"})
	require.NoError(t, err)

	assert.True(t, result.OK)
	assert.Equal(t, http.StatusOK, result.Status)
	assert.Contains(t, result.Body, `"args"`)
	assert.Equal(t, "application/json", result.Headers["Content-Type"])
}

func TestFetchWith404(t *testing.T) {
	ctx := context.Background()
	result, err := Fetch(ctx, FetchArgs{Input: "https://httpbin.org/status/404"})
	require.NoError(t, err)

	assert.False(t, result.OK)
	assert.Equal(t, http.StatusNotFound, result.Status)
}

func TestFetchWithInvalidURL(t *testing.T) {
	ctx := context.Background()
	_, err := Fetch(ctx, FetchArgs{Input: "http://this-domain-does-not-exist-12345.com"})
	assert.Error(t, err)
	assert.Contains(t, err.Error(), "failed to fetch")
}

func TestFetchWithHeaders(t *testing.T) {
	ctx := context.Background()
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		assert.Equal(t, "Bearer test-token", r.Header.Get("Authorization"))
		assert.Equal(t, "GET", r.Method)
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`ok`))
	}))
	defer server.Close()

	headers := map[string]string{
		"Authorization": "Bearer test-token",
	}
	options := &RequestInit{
		Method:  "GET",
		Headers: headers,
	}
	result, err := Fetch(ctx, FetchArgs{Input: server.URL, Init: options})
	require.NoError(t, err)
	assert.True(t, result.OK)
}

func TestFetchDefaults(t *testing.T) {
	ctx := context.Background()
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		assert.Equal(t, "GET", r.Method, "default method should be GET")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`ok`))
	}))
	defer server.Close()

	options := &RequestInit{}
	result, err := Fetch(ctx, FetchArgs{Input: server.URL, Init: options})
	require.NoError(t, err)
	assert.True(t, result.OK)
}

func TestFetchReturnsPromise(t *testing.T) {
	vm, err := quickjs.NewVM()
	require.NoError(t, err)
	defer func() {
		_ = vm.Close()
	}()
	vm.SetCanBlock(true)

	functions.RegisterBuiltins(context.Background(), vm)

	result, err := vm.Eval(`fetch({input: "https://example.com"})`, quickjs.EvalGlobal)
	require.NoError(t, err)
	assert.NotNil(t, result)
}

func TestFetchAsyncAwait(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`{"status":"ok"}`))
	}))
	defer server.Close()

	vm, err := quickjs.NewVM()
	require.NoError(t, err)
	defer func() {
		_ = vm.Close()
	}()
	vm.SetCanBlock(true)

	functions.RegisterBuiltins(context.Background(), vm)

	result, err := vm.Eval(`fetch({input: "`+server.URL+`"})`, quickjs.EvalGlobal)
	require.NoError(t, err)

	if obj, ok := result.(*quickjs.Object); ok {
		var arr []any
		if err := obj.Into(&arr); err == nil && len(arr) > 0 {
			if response, ok := arr[0].(map[string]any); ok {
				assert.True(t, response["ok"].(bool))
			}
		}
	}
}