package hrp

import (
	"crypto/tls"
	"net"
	"net/http"
	"net/url"
	"path/filepath"
	"testing"
	"time"

	"github.com/gorilla/websocket"
	"github.com/jinzhu/copier"
	"github.com/pkg/errors"
	"github.com/rs/zerolog/log"
	"golang.org/x/net/http2"

	"github.com/httprunner/httprunner/v4/hrp/internal/sdk"
)

// Run starts to run API test with default configs.
func Run(testcases ...ITestCase) error {
	t := &testing.T{}
	return NewRunner(t).SetRequestsLogOn().Run(testcases...)
}

// NewRunner constructs a new runner instance.
func NewRunner(t *testing.T) *HRPRunner {
	if t == nil {
		t = &testing.T{}
	}
	return &HRPRunner{
		t:             t,
		failfast:      true, // default to failfast
		genHTMLReport: false,
		httpClient: &http.Client{
			Transport: &http.Transport{
				TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
			},
			Timeout: 30 * time.Second,
		},
		http2Client: &http.Client{
			Transport: &http2.Transport{
				TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
			},
			Timeout: 30 * time.Second,
		},
		// use default handshake timeout (no timeout limit) here, enable timeout at step level
		wsDialer: &websocket.Dialer{
			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
		},
	}
}

type HRPRunner struct {
	t             *testing.T
	failfast      bool
	httpStatOn    bool
	requestsLogOn bool
	pluginLogOn   bool
	venv          string
	saveTests     bool
	genHTMLReport bool
	httpClient    *http.Client
	http2Client   *http.Client
	wsDialer      *websocket.Dialer
}

// SetClientTransport configures transport of http client for high concurrency load testing
func (r *HRPRunner) SetClientTransport(maxConns int, disableKeepAlive bool, disableCompression bool) *HRPRunner {
	log.Info().
		Int("maxConns", maxConns).
		Bool("disableKeepAlive", disableKeepAlive).
		Bool("disableCompression", disableCompression).
		Msg("[init] SetClientTransport")
	r.httpClient.Transport = &http.Transport{
		TLSClientConfig:     &tls.Config{InsecureSkipVerify: true},
		DialContext:         (&net.Dialer{}).DialContext,
		MaxIdleConns:        0,
		MaxIdleConnsPerHost: maxConns,
		DisableKeepAlives:   disableKeepAlive,
		DisableCompression:  disableCompression,
	}
	r.http2Client.Transport = &http2.Transport{
		TLSClientConfig:    &tls.Config{InsecureSkipVerify: true},
		DisableCompression: disableCompression,
	}
	r.wsDialer.EnableCompression = !disableCompression
	return r
}

// SetFailfast configures whether to stop running when one step fails.
func (r *HRPRunner) SetFailfast(failfast bool) *HRPRunner {
	log.Info().Bool("failfast", failfast).Msg("[init] SetFailfast")
	r.failfast = failfast
	return r
}

// SetRequestsLogOn turns on request & response details logging.
func (r *HRPRunner) SetRequestsLogOn() *HRPRunner {
	log.Info().Msg("[init] SetRequestsLogOn")
	r.requestsLogOn = true
	return r
}

// SetHTTPStatOn turns on HTTP latency stat.
func (r *HRPRunner) SetHTTPStatOn() *HRPRunner {
	log.Info().Msg("[init] SetHTTPStatOn")
	r.httpStatOn = true
	return r
}

// SetPluginLogOn turns on plugin logging.
func (r *HRPRunner) SetPluginLogOn() *HRPRunner {
	log.Info().Msg("[init] SetPluginLogOn")
	r.pluginLogOn = true
	return r
}

// SetPython3Venv specifies python3 venv.
func (r *HRPRunner) SetPython3Venv(venv string) *HRPRunner {
	log.Info().Str("venv", venv).Msg("[init] SetPython3Venv")
	r.venv = venv
	return r
}

// SetProxyUrl configures the proxy URL, which is usually used to capture HTTP packets for debugging.
func (r *HRPRunner) SetProxyUrl(proxyUrl string) *HRPRunner {
	log.Info().Str("proxyUrl", proxyUrl).Msg("[init] SetProxyUrl")
	p, err := url.Parse(proxyUrl)
	if err != nil {
		log.Error().Err(err).Str("proxyUrl", proxyUrl).Msg("[init] invalid proxyUrl")
		return r
	}
	r.httpClient.Transport = &http.Transport{
		Proxy:           http.ProxyURL(p),
		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
	}
	r.wsDialer.Proxy = http.ProxyURL(p)
	return r
}

// SetSaveTests configures whether to save summary of tests.
func (r *HRPRunner) SetSaveTests(saveTests bool) *HRPRunner {
	log.Info().Bool("saveTests", saveTests).Msg("[init] SetSaveTests")
	r.saveTests = saveTests
	return r
}

// GenHTMLReport configures whether to gen html report of api tests.
func (r *HRPRunner) GenHTMLReport() *HRPRunner {
	log.Info().Bool("genHTMLReport", true).Msg("[init] SetgenHTMLReport")
	r.genHTMLReport = true
	return r
}

// Run starts to execute one or multiple testcases.
func (r *HRPRunner) Run(testcases ...ITestCase) error {
	event := sdk.EventTracking{
		Category: "RunAPITests",
		Action:   "hrp run",
	}
	// report start event
	go sdk.SendEvent(event)
	// report execution timing event
	defer sdk.SendEvent(event.StartTiming("execution"))
	// record execution data to summary
	s := newOutSummary()

	// load all testcases
	testCases, err := LoadTestCases(testcases...)
	if err != nil {
		log.Error().Err(err).Msg("failed to load testcases")
		return err
	}

	var runErr error
	// run testcase one by one
	for _, testcase := range testCases {
		sessionRunner, err := r.NewSessionRunner(testcase)
		if err != nil {
			log.Error().Err(err).Msg("[Run] init session runner failed")
			return err
		}
		defer func() {
			if sessionRunner.parser.plugin != nil {
				sessionRunner.parser.plugin.Quit()
			}
		}()

		for it := sessionRunner.parametersIterator; it.HasNext(); {
			err = sessionRunner.Start(it.Next())
			caseSummary := sessionRunner.GetSummary()
			s.appendCaseSummary(caseSummary)
			if err != nil {
				log.Error().Err(err).Msg("[Run] run testcase failed")
				runErr = err
				break
			}
		}
	}
	s.Time.Duration = time.Since(s.Time.StartAt).Seconds()

	// save summary
	if r.saveTests {
		err := s.genSummary()
		if err != nil {
			return err
		}
	}

	// generate HTML report
	if r.genHTMLReport {
		err := s.genHTMLReport()
		if err != nil {
			return err
		}
	}

	return runErr
}

// NewSessionRunner creates a new session runner for testcase.
// each testcase has its own session runner
func (r *HRPRunner) NewSessionRunner(testcase *TestCase) (*SessionRunner, error) {
	runner, err := r.newCaseRunner(testcase)
	if err != nil {
		return nil, err
	}

	sessionRunner := &SessionRunner{
		testCaseRunner: runner,
	}
	sessionRunner.resetSession()
	return sessionRunner, nil
}

func (r *HRPRunner) newCaseRunner(testcase *TestCase) (*testCaseRunner, error) {
	runner := &testCaseRunner{
		testCase:  testcase,
		hrpRunner: r,
		parser:    newParser(),
	}

	// init parser plugin
	plugin, err := initPlugin(testcase.Config.Path, r.venv, r.pluginLogOn)
	if err != nil {
		return nil, errors.Wrap(err, "init plugin failed")
	}
	if plugin != nil {
		runner.parser.plugin = plugin
		runner.rootDir = filepath.Dir(plugin.Path())
	}

	// parse testcase config
	if err := runner.parseConfig(); err != nil {
		return nil, errors.Wrap(err, "parse testcase config failed")
	}

	return runner, nil
}

type testCaseRunner struct {
	testCase           *TestCase
	hrpRunner          *HRPRunner
	parser             *Parser
	parsedConfig       *TConfig
	parametersIterator *ParametersIterator
	rootDir            string // project root dir
}

// parseConfig parses testcase config, stores to parsedConfig.
func (r *testCaseRunner) parseConfig() error {
	cfg := r.testCase.Config

	r.parsedConfig = &TConfig{}
	// deep copy config to avoid data racing
	if err := copier.Copy(r.parsedConfig, cfg); err != nil {
		log.Error().Err(err).Msg("copy testcase config failed")
		return err
	}

	// parse config variables
	parsedVariables, err := r.parser.ParseVariables(cfg.Variables)
	if err != nil {
		log.Error().Interface("variables", cfg.Variables).Err(err).Msg("parse config variables failed")
		return err
	}
	r.parsedConfig.Variables = parsedVariables

	// parse config name
	parsedName, err := r.parser.ParseString(cfg.Name, parsedVariables)
	if err != nil {
		return errors.Wrap(err, "parse config name failed")
	}
	r.parsedConfig.Name = convertString(parsedName)

	// parse config base url
	parsedBaseURL, err := r.parser.ParseString(cfg.BaseURL, parsedVariables)
	if err != nil {
		return errors.Wrap(err, "parse config base url failed")
	}
	r.parsedConfig.BaseURL = convertString(parsedBaseURL)

	// merge config environment variables with base_url
	// priority: env base_url > base_url
	if cfg.Environs != nil {
		r.parsedConfig.Environs = cfg.Environs
	} else {
		r.parsedConfig.Environs = make(map[string]string)
	}
	if value, ok := r.parsedConfig.Environs["base_url"]; !ok || value == "" {
		if r.parsedConfig.BaseURL != "" {
			r.parsedConfig.Environs["base_url"] = r.parsedConfig.BaseURL
		}
	}

	// merge config variables with environment variables
	// priority: env > config variables
	for k, v := range r.parsedConfig.Environs {
		r.parsedConfig.Variables[k] = v
	}

	// ensure correction of think time config
	r.parsedConfig.ThinkTimeSetting.checkThinkTime()

	// ensure correction of websocket config
	r.parsedConfig.WebSocketSetting.checkWebSocket()

	// parse testcase config parameters
	parametersIterator, err := initParametersIterator(r.parsedConfig)
	if err != nil {
		log.Error().Err(err).
			Interface("parameters", r.parsedConfig.Parameters).
			Interface("parametersSetting", r.parsedConfig.ParametersSetting).
			Msg("parse config parameters failed")
		return errors.Wrap(err, "parse testcase config parameters failed")
	}
	r.parametersIterator = parametersIterator

	return nil
}

// each boomer task initiates a new session
// in order to avoid data racing
func (r *testCaseRunner) newSession() *SessionRunner {
	sessionRunner := &SessionRunner{
		testCaseRunner: r,
	}
	sessionRunner.resetSession()
	return sessionRunner
}