package config_test

import (
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"git.yuntuo.hk/k2safe/go-omni/config"
)

func TestHTTPFileAndEnvironment(t *testing.T) {
	for _, file := range []struct{ name, body string }{
		{"server.json", `{"http":{"readHeaderTimeout":"2s","readTimeout":"3s","writeTimeout":"4s","idleTimeout":"5s","maxHeaderBytes":8192}}`},
		{"server.yaml", "http:\n  readHeaderTimeout: 2s\n  readTimeout: 3s\n  writeTimeout: 4s\n  idleTimeout: 5s\n  maxHeaderBytes: 8192\n"},
	} {
		t.Run(file.name, func(t *testing.T) {
			path := filepath.Join(t.TempDir(), file.name)
			if err := os.WriteFile(path, []byte(file.body), 0600); err != nil {
				t.Fatal(err)
			}
			cfg, err := config.LoadFile(path)
			if err != nil {
				t.Fatal(err)
			}
			want := config.HTTPConfig{ReadHeaderTimeout: 2 * time.Second, ReadTimeout: 3 * time.Second, WriteTimeout: 4 * time.Second, IdleTimeout: 5 * time.Second, MaxHeaderBytes: 8192}
			if cfg.HTTP != want {
				t.Fatalf("HTTP: %+v", cfg.HTTP)
			}
			t.Setenv("HTTP_TEST_HTTP_READ_HEADER_TIMEOUT", "6s")
			t.Setenv("HTTP_TEST_HTTP_READ_TIMEOUT", "7s")
			t.Setenv("HTTP_TEST_HTTP_WRITE_TIMEOUT", "8s")
			t.Setenv("HTTP_TEST_HTTP_IDLE_TIMEOUT", "9s")
			t.Setenv("HTTP_TEST_HTTP_MAX_HEADER_BYTES", "16384")
			if err := os.WriteFile(path, []byte(`{"http":{"readHeaderTimeout":"${HTTP_TEST_HTTP_READ_HEADER_TIMEOUT}","readTimeout":"${HTTP_TEST_HTTP_READ_TIMEOUT}","writeTimeout":"${HTTP_TEST_HTTP_WRITE_TIMEOUT}","idleTimeout":"${HTTP_TEST_HTTP_IDLE_TIMEOUT}","maxHeaderBytes":"${HTTP_TEST_HTTP_MAX_HEADER_BYTES}"}}`), 0600); err != nil {
				t.Fatal(err)
			}
			got, err := config.LoadProject(path, cfg)
			if err != nil {
				t.Fatal(err)
			}
			want = config.HTTPConfig{ReadHeaderTimeout: 6 * time.Second, ReadTimeout: 7 * time.Second, WriteTimeout: 8 * time.Second, IdleTimeout: 9 * time.Second, MaxHeaderBytes: 16384}
			if got.HTTP != want {
				t.Fatalf("overlay: %+v", got.HTTP)
			}
		})
	}
}

func TestHTTPInvalidAndUnsupportedSettings(t *testing.T) {
	for _, key := range []string{"READ_HEADER_TIMEOUT", "READ_TIMEOUT", "WRITE_TIMEOUT", "IDLE_TIMEOUT", "MAX_HEADER_BYTES"} {
		for _, value := range []string{"invalid", "-1"} {
			t.Run(key+value, func(t *testing.T) {
				if value == "-1" && key != "MAX_HEADER_BYTES" {
					value = "-1s"
				}
				t.Setenv("HTTP_INVALID_HTTP_"+key, value)
				names := map[string]string{"READ_HEADER_TIMEOUT": "readHeaderTimeout", "READ_TIMEOUT": "readTimeout", "WRITE_TIMEOUT": "writeTimeout", "IDLE_TIMEOUT": "idleTimeout", "MAX_HEADER_BYTES": "maxHeaderBytes"}
				path := filepath.Join(t.TempDir(), "config.json")
				if err := os.WriteFile(path, []byte(`{"http":{"`+names[key]+`":"${HTTP_INVALID_HTTP_`+key+`}"}}`), 0600); err != nil {
					t.Fatal(err)
				}
				if _, err := config.LoadFile(path); err == nil {
					t.Fatal("invalid HTTP value accepted")
				}
			})
		}
	}
	for _, http := range []config.HTTPConfig{{ReadHeaderTimeout: time.Second}, {ReadTimeout: time.Second}, {WriteTimeout: time.Second}} {
		cfg := config.Default()
		cfg.Transport = config.TransportHTTP2
		cfg.TLS = config.TLSConfig{CertFile: "c", KeyFile: "k"}
		cfg.HTTP = http
		if err := cfg.ValidateTransport(); err == nil || !strings.Contains(err.Error(), "not supported") {
			t.Fatalf("HTTP/2: %v", err)
		}
	}
	cfg := config.Default()
	cfg.Transport = config.TransportHTTP2
	cfg.TLS = config.TLSConfig{CertFile: "c", KeyFile: "k"}
	cfg.HTTP = config.HTTPConfig{IdleTimeout: time.Minute, MaxHeaderBytes: 8192}
	if err := cfg.ValidateTransport(); err != nil {
		t.Fatal(err)
	}
	for _, transport := range []string{config.TransportNative, config.TransportHTTP2} {
		cfg.Transport = transport
		cfg.HTTP = config.HTTPConfig{ErrorLog: log.New(io.Discard, "", 0)}
		if err := cfg.ValidateTransport(); err == nil || !strings.Contains(err.Error(), "http.errorLog") {
			t.Fatalf("ErrorLog silently ignored: %v", err)
		}
	}
}