/*
	Handlers and types specific to Chromium analysis tasks.
*/

package chromium_analysis

import (
	"context"
	"fmt"
	"net/http"
	"path"
	"path/filepath"
	"strconv"
	"strings"
	"text/template"

	"cloud.google.com/go/datastore"
	"github.com/go-chi/chi/v5"
	"go.skia.org/infra/ct/go/ctfe/task_common"
	ctfeutil "go.skia.org/infra/ct/go/ctfe/util"
	ctutil "go.skia.org/infra/ct/go/util"
	"go.skia.org/infra/go/cas"
	"go.skia.org/infra/go/ds"
	"go.skia.org/infra/go/email"
	"go.skia.org/infra/go/httputils"
	"go.skia.org/infra/go/sklog"
	"go.skia.org/infra/go/swarming"
	skutil "go.skia.org/infra/go/util"
	"google.golang.org/api/iterator"
)

var (
	addTaskTemplate     *template.Template = nil
	runsHistoryTemplate *template.Template = nil

	httpClient = httputils.NewTimeoutClient()
)

func ReloadTemplates(resourcesDir string) {
	addTaskTemplate = template.Must(template.ParseFiles(
		filepath.Join(resourcesDir, "chromium_analysis.html"),
	))
	runsHistoryTemplate = template.Must(template.ParseFiles(
		filepath.Join(resourcesDir, "chromium_analysis_runs.html"),
	))
}

type ChromiumAnalysisDatastoreTask struct {
	task_common.CommonCols

	Benchmark            string   `json:"benchmark"`
	PageSets             string   `json:"page_sets"`
	IsTestPageSet        bool     `json:"is_test_page_set"`
	GnArgs               string   `json:"gn_args"`
	BenchmarkArgs        string   `json:"benchmark_args"`
	BrowserArgs          string   `json:"browser_args"`
	Description          string   `json:"description"`
	CustomWebpagesGSPath string   `json:"custom_webpages_gspath"`
	ChromiumPatchGSPath  string   `json:"chromium_patch_gspath"`
	SkiaPatchGSPath      string   `json:"skia_patch_gspath"`
	CatapultPatchGSPath  string   `json:"catapult_patch_gspath"`
	BenchmarkPatchGSPath string   `json:"benchmark_patch_gspath"`
	V8PatchGSPath        string   `json:"v8_patch_gspath"`
	RunInParallel        bool     `json:"run_in_parallel"`
	Platform             string   `json:"platform"`
	RunOnGCE             bool     `json:"run_on_gce"`
	RawOutput            string   `json:"raw_output"`
	ValueColumnName      string   `json:"value_column_name"`
	MatchStdoutTxt       string   `json:"match_stdout_txt"`
	ChromiumHash         string   `json:"chromium_hash"`
	ApkGsPath            string   `json:"apk_gspath"`
	ChromeBuildGsPath    string   `json:"chrome_build_gs_path"`
	TelemetryIsolateHash string   `json:"telemetry_isolate_hash"`
	CCList               []string `json:"cc_list"`
	TaskPriority         int      `json:"task_priority"`
	GroupName            string   `json:"group_name"`
}

func (task ChromiumAnalysisDatastoreTask) GetTaskName() string {
	return "ChromiumAnalysis"
}

func (task ChromiumAnalysisDatastoreTask) GetDescription() string {
	return task.Description
}

func (task *ChromiumAnalysisDatastoreTask) GetPopulatedAddTaskVars() (task_common.AddTaskVars, error) {
	taskVars := &ChromiumAnalysisAddTaskVars{}
	taskVars.Username = task.Username
	taskVars.TsAdded = ctutil.GetCurrentTs()
	taskVars.RepeatAfterDays = strconv.FormatInt(task.RepeatAfterDays, 10)
	taskVars.Benchmark = task.Benchmark
	taskVars.PageSets = task.PageSets
	taskVars.GnArgs = task.GnArgs
	taskVars.BenchmarkArgs = task.BenchmarkArgs
	taskVars.BrowserArgs = task.BrowserArgs
	taskVars.Description = task.Description

	var err error
	taskVars.CustomWebpages, err = ctutil.GetPatchFromStorage(task.CustomWebpagesGSPath)
	if err != nil {
		return nil, fmt.Errorf("Could not read from %s: %s", task.CustomWebpagesGSPath, err)
	}
	taskVars.ChromiumPatch, err = ctutil.GetPatchFromStorage(task.ChromiumPatchGSPath)
	if err != nil {
		return nil, fmt.Errorf("Could not read from %s: %s", task.ChromiumPatchGSPath, err)
	}
	taskVars.SkiaPatch, err = ctutil.GetPatchFromStorage(task.SkiaPatchGSPath)
	if err != nil {
		return nil, fmt.Errorf("Could not read from %s: %s", task.SkiaPatchGSPath, err)
	}
	taskVars.CatapultPatch, err = ctutil.GetPatchFromStorage(task.CatapultPatchGSPath)
	if err != nil {
		return nil, fmt.Errorf("Could not read from %s: %s", task.CatapultPatchGSPath, err)
	}
	taskVars.BenchmarkPatch, err = ctutil.GetPatchFromStorage(task.BenchmarkPatchGSPath)
	if err != nil {
		return nil, fmt.Errorf("Could not read from %s: %s", task.BenchmarkPatchGSPath, err)
	}
	taskVars.V8Patch, err = ctutil.GetPatchFromStorage(task.V8PatchGSPath)
	if err != nil {
		return nil, fmt.Errorf("Could not read from %s: %s", task.V8PatchGSPath, err)
	}

	taskVars.RunInParallel = task.RunInParallel
	taskVars.Platform = task.Platform
	taskVars.RunOnGCE = task.RunOnGCE
	taskVars.ValueColumnName = task.ValueColumnName
	taskVars.MatchStdoutTxt = task.MatchStdoutTxt
	taskVars.ChromiumHash = task.ChromiumHash
	taskVars.ApkGsPath = task.ApkGsPath
	taskVars.ChromeBuildGsPath = task.ChromeBuildGsPath
	taskVars.TelemetryIsolateHash = task.TelemetryIsolateHash
	taskVars.CCList = task.CCList
	taskVars.TaskPriority = strconv.Itoa(task.TaskPriority)
	taskVars.GroupName = task.GroupName
	return taskVars, nil
}

func (task ChromiumAnalysisDatastoreTask) GetResultsLink() string {
	return task.RawOutput
}

func (task ChromiumAnalysisDatastoreTask) RunsOnGCEWorkers() bool {
	return task.RunOnGCE && task.Platform != ctutil.PLATFORM_ANDROID
}

func (task ChromiumAnalysisDatastoreTask) GetDatastoreKind() ds.Kind {
	return ds.CHROMIUM_ANALYSIS_TASKS
}

func (task ChromiumAnalysisDatastoreTask) Query(it *datastore.Iterator) (interface{}, error) {
	tasks := []*ChromiumAnalysisDatastoreTask{}
	for {
		t := &ChromiumAnalysisDatastoreTask{}
		_, err := it.Next(t)
		if err == iterator.Done {
			break
		} else if err != nil {
			return nil, fmt.Errorf("Failed to retrieve list of tasks: %s", err)
		}
		tasks = append(tasks, t)
	}

	return tasks, nil
}

func (task ChromiumAnalysisDatastoreTask) Get(c context.Context, key *datastore.Key) (task_common.Task, error) {
	t := &ChromiumAnalysisDatastoreTask{}
	if err := ds.DS.Get(c, key, t); err != nil {
		return nil, err
	}
	return t, nil
}

func (task ChromiumAnalysisDatastoreTask) TriggerSwarmingTaskAndMail(ctx context.Context, swarmingClient swarming.ApiClient, casClient cas.CAS) error {
	runID := task_common.GetRunID(&task)
	emails := task_common.GetEmailRecipients(task.Username, task.CCList)
	cmd := []string{
		"cipd_bin_packages/luci-auth",
		"context",
		"--",
		"bin/run_chromium_analysis_on_workers",
		"-logtostderr",
		"--pageset_type=" + task.PageSets,
		"--gn_args=" + task.GnArgs,
		"--benchmark_name=" + task.Benchmark,
		"--benchmark_extra_args=" + task.BenchmarkArgs,
		"--browser_extra_args=" + task.BrowserArgs,
		"--run_in_parallel=" + strconv.FormatBool(task.RunInParallel),
		"--target_platform=" + task.Platform,
		"--run_on_gce=" + strconv.FormatBool(task.RunsOnGCEWorkers()),
		"--match_stdout_txt=" + task.MatchStdoutTxt,
		"--chromium_hash=" + task.ChromiumHash,
		"--run_id=" + runID,
		"--task_priority=" + strconv.Itoa(task.TaskPriority),
		"--group_name=" + task.GroupName,
		"--chromium_patch_gs_path=" + task.ChromiumPatchGSPath,
		"--apk_gs_path=" + task.ApkGsPath,
		"--chrome_build_gs_path=" + task.ChromeBuildGsPath,
		"--telemetry_isolate_hash=" + task.TelemetryIsolateHash,
		"--skia_patch_gs_path=" + task.SkiaPatchGSPath,
		"--v8_patch_gs_path=" + task.V8PatchGSPath,
		"--catapult_patch_gs_path=" + task.CatapultPatchGSPath,
		"--custom_webpages_csv_gs_path=" + task.CustomWebpagesGSPath,
		"--value_column_name=" + task.ValueColumnName,
	}
	casSpec := ctutil.CasChromiumAnalysisMaster()
	sTaskID, err := ctutil.TriggerMasterScriptSwarmingTask(ctx, runID, "run_chromium_analysis_on_workers", false, cmd, casSpec, swarmingClient, casClient)
	if err != nil {
		return fmt.Errorf("Could not trigger master script for run_chromium_analysis_on_workers with cmd %v: %s", cmd, err)
	}
	// Mark task as started in datastore.
	if err := task_common.UpdateTaskSetStarted(ctx, runID, sTaskID, &task); err != nil {
		return fmt.Errorf("Could not mark task as started in datastore: %s", err)
	}
	// Send start email.
	skutil.LogErr(ctfeutil.SendTaskStartEmail(task.DatastoreKey.ID, emails, "Chromium analysis", runID, task.Description, fmt.Sprintf("Triggered %s benchmark on %s %s pageset.", task.Benchmark, task.Platform, task.PageSets)))
	return nil
}

func (task ChromiumAnalysisDatastoreTask) SendCompletionEmail(ctx context.Context, completedSuccessfully bool) error {
	runID := task_common.GetRunID(&task)
	emails := task_common.GetEmailRecipients(task.Username, task.CCList)
	emailSubject := fmt.Sprintf("Cluster telemetry chromium analysis task has completed (#%d)", task.DatastoreKey.ID)
	failureHtml := ""
	viewActionMarkup := ""
	ctPerfHtml := ""
	var err error

	if completedSuccessfully {
		if viewActionMarkup, err = email.GetViewActionMarkup(task.RawOutput, "View Results", "Direct link to the CSV results"); err != nil {
			return fmt.Errorf("Failed to get view action markup: %s", err)
		}
		ctPerfHtml = ctfeutil.GetCTPerfEmailHtml(task.GroupName)
	} else {
		emails = task_common.GetFailureEmailRecipients(task.Username, task.CCList)
		emailSubject += " with failures"
		failureHtml = ctfeutil.GetFailureEmailHtml(runID)
		if viewActionMarkup, err = email.GetViewActionMarkup(fmt.Sprintf(ctutil.SWARMING_RUN_ID_ALL_TASKS_LINK_TEMPLATE, runID), "View Failure", "Direct link to the swarming logs"); err != nil {
			return fmt.Errorf("Failed to get view action markup: %s", err)
		}
	}

	// Instantiate GcsUtil object and use to calculate number of archives
	gs, err := ctutil.NewGcsUtil(nil)
	if err != nil {
		return fmt.Errorf("Could not instantiate gsutil object: %s", err)
	}
	totalArchivedWebpages, err := ctutil.GetArchivesNum(gs, task.BenchmarkArgs, task.PageSets)
	if err != nil {
		sklog.Errorf("Error when calculating number of archives: %s", err)
		totalArchivedWebpages = -1
	}
	archivedWebpagesText := ""
	if totalArchivedWebpages != -1 {
		archivedWebpagesText = fmt.Sprintf(" %d WPR archives were used.", totalArchivedWebpages)
	}

	bodyTemplate := `
	The chromium analysis %s benchmark task on %s pageset has completed. %s.<br/>
	Run description: %s<br/>
	%s
	%s
	The CSV output is <a href='%s'>here</a>.%s<br/>
	The patch(es) you specified are here:
	<a href='%s'>chromium</a>/<a href='%s'>skia</a>/<a href='%s'>v8</a>/<a href='%s'>catapult</a>
	<br/>
	Custom webpages (if specified) are <a href='%s'>here</a>.
	<br/><br/>
	You can schedule more runs <a href='%s'>here</a>.
	<br/><br/>
	Thanks!
	`
	chromiumPatchLink := ctutil.GCS_HTTP_LINK + path.Join(ctutil.GCSBucketName, task.ChromiumPatchGSPath)
	skiaPatchLink := ctutil.GCS_HTTP_LINK + path.Join(ctutil.GCSBucketName, task.SkiaPatchGSPath)
	v8PatchLink := ctutil.GCS_HTTP_LINK + path.Join(ctutil.GCSBucketName, task.V8PatchGSPath)
	catapultPatchLink := ctutil.GCS_HTTP_LINK + path.Join(ctutil.GCSBucketName, task.CatapultPatchGSPath)
	customWebpagesLink := ctutil.GCS_HTTP_LINK + path.Join(ctutil.GCSBucketName, task.CustomWebpagesGSPath)
	emailBody := fmt.Sprintf(bodyTemplate, task.Benchmark, task.PageSets, ctfeutil.GetSwarmingLogsLink(runID), task.Description, failureHtml, ctPerfHtml, task.RawOutput, archivedWebpagesText, chromiumPatchLink, skiaPatchLink, v8PatchLink, catapultPatchLink, customWebpagesLink, task_common.WebappURL+ctfeutil.CHROMIUM_ANALYSIS_URI)
	if err := ctfeutil.SendEmailWithMarkup(emails, emailSubject, emailBody, viewActionMarkup); err != nil {
		return fmt.Errorf("Error while sending email: %s", err)
	}
	return nil
}

func (task *ChromiumAnalysisDatastoreTask) SetCompleted(success bool) {
	if success {
		runID := task_common.GetRunID(task)
		task.RawOutput = ctutil.GetAnalysisOutputLink(runID)
	}
	task.TsCompleted = ctutil.GetCurrentTsInt64()
	task.Failure = !success
	task.TaskDone = true
}

func addTaskView(w http.ResponseWriter, r *http.Request) {
	ctfeutil.ExecuteSimpleTemplate(addTaskTemplate, w, r)
}

type ChromiumAnalysisAddTaskVars struct {
	task_common.AddTaskCommonVars

	Benchmark            string   `json:"benchmark"`
	PageSets             string   `json:"page_sets"`
	CustomWebpages       string   `json:"custom_webpages"`
	GnArgs               string   `json:"gn_args"`
	BenchmarkArgs        string   `json:"benchmark_args"`
	BrowserArgs          string   `json:"browser_args"`
	Description          string   `json:"desc"`
	ChromiumPatch        string   `json:"chromium_patch"`
	SkiaPatch            string   `json:"skia_patch"`
	CatapultPatch        string   `json:"catapult_patch"`
	BenchmarkPatch       string   `json:"benchmark_patch"`
	V8Patch              string   `json:"v8_patch"`
	RunInParallel        bool     `json:"run_in_parallel"`
	Platform             string   `json:"platform"`
	RunOnGCE             bool     `json:"run_on_gce"`
	ValueColumnName      string   `json:"value_column_name"`
	MatchStdoutTxt       string   `json:"match_stdout_txt"`
	ChromiumHash         string   `json:"chromium_hash"`
	ApkGsPath            string   `json:"apk_gs_path"`
	ChromeBuildGsPath    string   `json:"chrome_build_gs_path"`
	TelemetryIsolateHash string   `json:"telemetry_isolate_hash"`
	CCList               []string `json:"cc_list"`
	TaskPriority         string   `json:"task_priority"`
	GroupName            string   `json:"group_name"`
}

func (task *ChromiumAnalysisAddTaskVars) GetDatastoreKind() ds.Kind {
	return ds.CHROMIUM_ANALYSIS_TASKS
}

func (task *ChromiumAnalysisAddTaskVars) GetPopulatedDatastoreTask(ctx context.Context) (task_common.Task, error) {
	if task.Benchmark == "" ||
		task.PageSets == "" ||
		task.Platform == "" ||
		task.Description == "" {
		return nil, fmt.Errorf("Invalid parameters")
	}
	if task.GroupName != "" && len(task.GroupName) >= ctfeutil.MAX_GROUPNAME_LEN {
		return nil, fmt.Errorf("Please limit group names to less than %d characters", ctfeutil.MAX_GROUPNAME_LEN)
	}
	customWebpagesSlice, err := ctfeutil.GetQualifiedCustomWebpages(task.CustomWebpages, task.BenchmarkArgs)
	if err != nil {
		return nil, err
	}
	customWebpages := strings.Join(customWebpagesSlice, ",")
	customWebpagesGSPath, err := ctutil.SavePatchToStorage(customWebpages)
	if err != nil {
		return nil, fmt.Errorf("Could not save custom webpages to storage: %s", err)
	}

	chromiumPatchGSPath, err := ctutil.SavePatchToStorage(task.ChromiumPatch)
	if err != nil {
		return nil, fmt.Errorf("Could not save chromium patch to storage: %s", err)
	}
	skiaPatchGSPath, err := ctutil.SavePatchToStorage(task.SkiaPatch)
	if err != nil {
		return nil, fmt.Errorf("Could not save skia patch to storage: %s", err)
	}
	catapultPatchGSPath, err := ctutil.SavePatchToStorage(task.CatapultPatch)
	if err != nil {
		return nil, fmt.Errorf("Could not save catapult patch to storage: %s", err)
	}
	benchmarkPatchGSPath, err := ctutil.SavePatchToStorage(task.BenchmarkPatch)
	if err != nil {
		return nil, fmt.Errorf("Could not save benchmark patch to storage: %s", err)
	}
	v8PatchGSPath, err := ctutil.SavePatchToStorage(task.V8Patch)
	if err != nil {
		return nil, fmt.Errorf("Could not save v8 patch to storage: %s", err)
	}

	t := &ChromiumAnalysisDatastoreTask{
		Benchmark:     task.Benchmark,
		PageSets:      task.PageSets,
		IsTestPageSet: task.PageSets == ctutil.PAGESET_TYPE_DUMMY_1k || task.PageSets == ctutil.PAGESET_TYPE_MOBILE_DUMMY_1k,
		GnArgs:        task.GnArgs,
		BenchmarkArgs: task.BenchmarkArgs,
		BrowserArgs:   task.BrowserArgs,
		Description:   task.Description,

		CustomWebpagesGSPath: customWebpagesGSPath,
		ChromiumPatchGSPath:  chromiumPatchGSPath,
		SkiaPatchGSPath:      skiaPatchGSPath,
		CatapultPatchGSPath:  catapultPatchGSPath,
		BenchmarkPatchGSPath: benchmarkPatchGSPath,
		V8PatchGSPath:        v8PatchGSPath,

		RunInParallel:        task.RunInParallel,
		Platform:             task.Platform,
		RunOnGCE:             task.RunOnGCE,
		ValueColumnName:      task.ValueColumnName,
		MatchStdoutTxt:       task.MatchStdoutTxt,
		ChromiumHash:         task.ChromiumHash,
		ApkGsPath:            task.ApkGsPath,
		ChromeBuildGsPath:    task.ChromeBuildGsPath,
		TelemetryIsolateHash: task.TelemetryIsolateHash,
		CCList:               task.CCList,
		GroupName:            task.GroupName,
	}
	taskPriority, err := strconv.Atoi(task.TaskPriority)
	if err != nil {
		return nil, fmt.Errorf("%s is not int: %s", task.TaskPriority, err)
	}
	if taskPriority == 0 {
		// This should only happen for repeating tasks that were created before
		// support for task priorities was added to CT.
		// Triggering tasks with 0 priority fails in swarming with
		// "priority 0 can only be used for terminate request"
		// Override it to the medium priority.
		taskPriority = ctutil.TASKS_PRIORITY_MEDIUM
	}
	t.TaskPriority = taskPriority
	return t, nil
}

func addTaskHandler(w http.ResponseWriter, r *http.Request) {
	task_common.AddTaskHandler(w, r, &ChromiumAnalysisAddTaskVars{})
}

func getTasksHandler(w http.ResponseWriter, r *http.Request) {
	task_common.GetTasksHandler(&ChromiumAnalysisDatastoreTask{}, w, r)
}

func deleteTaskHandler(w http.ResponseWriter, r *http.Request) {
	task_common.DeleteTaskHandler(&ChromiumAnalysisDatastoreTask{}, w, r)
}

func redoTaskHandler(w http.ResponseWriter, r *http.Request) {
	task_common.RedoTaskHandler(&ChromiumAnalysisDatastoreTask{}, w, r)
}

func editTaskHandler(w http.ResponseWriter, r *http.Request) {
	task_common.EditTaskHandler(&ChromiumAnalysisDatastoreTask{}, w, r)
}

func runsHistoryView(w http.ResponseWriter, r *http.Request) {
	ctfeutil.ExecuteSimpleTemplate(runsHistoryTemplate, w, r)
}

func AddHandlers(externalRouter chi.Router) {
	externalRouter.Get("/"+ctfeutil.CHROMIUM_ANALYSIS_URI, addTaskView)
	externalRouter.Get("/"+ctfeutil.CHROMIUM_ANALYSIS_RUNS_URI, runsHistoryView)

	externalRouter.Post("/"+ctfeutil.ADD_CHROMIUM_ANALYSIS_TASK_POST_URI, addTaskHandler)
	externalRouter.Post("/"+ctfeutil.GET_CHROMIUM_ANALYSIS_TASKS_POST_URI, getTasksHandler)
	externalRouter.Post("/"+ctfeutil.DELETE_CHROMIUM_ANALYSIS_TASK_POST_URI, deleteTaskHandler)
	externalRouter.Post("/"+ctfeutil.REDO_CHROMIUM_ANALYSIS_TASK_POST_URI, redoTaskHandler)
	externalRouter.Post("/"+ctfeutil.EDIT_CHROMIUM_ANALYSIS_TASK_POST_URI, editTaskHandler)
}