// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package run

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"path/filepath"
	"strings"
	"sync"
	"time"

	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
	"github.com/nektos/act/pkg/common"
	"github.com/nektos/act/pkg/model"
	"github.com/nektos/act/pkg/runner"
	log "github.com/sirupsen/logrus"

	"gitea.com/gitea/act_runner/internal/app/artifactcache"
	"gitea.com/gitea/act_runner/internal/pkg/client"
	"gitea.com/gitea/act_runner/internal/pkg/config"
	"gitea.com/gitea/act_runner/internal/pkg/labels"
	"gitea.com/gitea/act_runner/internal/pkg/report"
	"gitea.com/gitea/act_runner/internal/pkg/ver"
)

// Runner runs the pipeline.
type Runner struct {
	name string

	cfg *config.Config

	client client.Client
	labels labels.Labels
	envs   map[string]string

	runningTasks sync.Map
}

func NewRunner(cfg *config.Config, reg *config.Registration, cli client.Client) *Runner {
	ls := labels.Labels{}
	for _, v := range reg.Labels {
		if l, err := labels.Parse(v); err == nil {
			ls = append(ls, l)
		}
	}
	envs := make(map[string]string, len(cfg.Runner.Envs))
	for k, v := range cfg.Runner.Envs {
		envs[k] = v
	}
	if cfg.Cache.Enabled == nil || *cfg.Cache.Enabled {
		cacheHandler, err := artifactcache.StartHandler(cfg.Cache.Dir, cfg.Cache.Host, cfg.Cache.Port)
		if err != nil {
			log.Errorf("cannot init cache server, it will be disabled: %v", err)
			// go on
		} else {
			envs["ACTIONS_CACHE_URL"] = cacheHandler.ExternalURL() + "/"
		}
	}

	// set artifact gitea api
	artifactGiteaAPI := strings.TrimSuffix(cli.Address(), "/") + "/api/actions_pipeline/"
	envs["ACTIONS_RUNTIME_URL"] = artifactGiteaAPI

	return &Runner{
		name:   reg.Name,
		cfg:    cfg,
		client: cli,
		labels: ls,
		envs:   envs,
	}
}

func (r *Runner) Run(ctx context.Context, task *runnerv1.Task) error {
	if _, ok := r.runningTasks.Load(task.Id); ok {
		return fmt.Errorf("task %d is already running", task.Id)
	} else {
		r.runningTasks.Store(task.Id, struct{}{})
		defer r.runningTasks.Delete(task.Id)
	}

	ctx, cancel := context.WithTimeout(ctx, r.cfg.Runner.Timeout)
	defer cancel()
	reporter := report.NewReporter(ctx, cancel, r.client, task)
	var runErr error
	defer func() {
		lastWords := ""
		if runErr != nil {
			lastWords = runErr.Error()
		}
		_ = reporter.Close(lastWords)
	}()
	reporter.RunDaemon()
	runErr = r.run(ctx, task, reporter)

	return nil
}

func (r *Runner) run(ctx context.Context, task *runnerv1.Task, reporter *report.Reporter) (err error) {
	defer func() {
		if r := recover(); r != nil {
			err = fmt.Errorf("panic: %v", r)
		}
	}()

	reporter.Logf("%s(version:%s) received task %v of job %v, be triggered by event: %s", r.name, ver.Version(), task.Id, task.Context.Fields["job"].GetStringValue(), task.Context.Fields["event_name"].GetStringValue())

	workflow, err := model.ReadWorkflow(bytes.NewReader(task.WorkflowPayload))
	if err != nil {
		return err
	}

	jobIDs := workflow.GetJobIDs()
	if len(jobIDs) != 1 {
		return fmt.Errorf("multiple jobs found: %v", jobIDs)
	}
	jobID := jobIDs[0]
	plan, err := model.CombineWorkflowPlanner(workflow).PlanJob(jobID)
	if err != nil {
		return err
	}
	job := workflow.GetJob(jobID)
	reporter.ResetSteps(len(job.Steps))

	taskContext := task.Context.Fields

	log.Infof("task %v repo is %v %v %v", task.Id, taskContext["repository"].GetStringValue(),
		taskContext["gitea_default_actions_url"].GetStringValue(),
		r.client.Address())

	preset := &model.GithubContext{
		Event:           taskContext["event"].GetStructValue().AsMap(),
		RunID:           taskContext["run_id"].GetStringValue(),
		RunNumber:       taskContext["run_number"].GetStringValue(),
		Actor:           taskContext["actor"].GetStringValue(),
		Repository:      taskContext["repository"].GetStringValue(),
		EventName:       taskContext["event_name"].GetStringValue(),
		Sha:             taskContext["sha"].GetStringValue(),
		Ref:             taskContext["ref"].GetStringValue(),
		RefName:         taskContext["ref_name"].GetStringValue(),
		RefType:         taskContext["ref_type"].GetStringValue(),
		HeadRef:         taskContext["head_ref"].GetStringValue(),
		BaseRef:         taskContext["base_ref"].GetStringValue(),
		Token:           taskContext["token"].GetStringValue(),
		RepositoryOwner: taskContext["repository_owner"].GetStringValue(),
		RetentionDays:   taskContext["retention_days"].GetStringValue(),
	}
	if t := task.Secrets["GITEA_TOKEN"]; t != "" {
		preset.Token = t
	} else if t := task.Secrets["GITHUB_TOKEN"]; t != "" {
		preset.Token = t
	}

	// use task token to action api token
	r.envs["ACTIONS_RUNTIME_TOKEN"] = preset.Token

	eventJSON, err := json.Marshal(preset.Event)
	if err != nil {
		return err
	}

	maxLifetime := 3 * time.Hour
	if deadline, ok := ctx.Deadline(); ok {
		maxLifetime = time.Until(deadline)
	}

	runnerConfig := &runner.Config{
		// On Linux, Workdir will be like "/<owner>/<repo>"
		// On Windows, Workdir will be like "\<owner>\<repo>"
		Workdir:     filepath.FromSlash(string(filepath.Separator) + preset.Repository),
		BindWorkdir: false,

		ReuseContainers:       false,
		ForcePull:             false,
		ForceRebuild:          false,
		LogOutput:             true,
		JSONLogger:            false,
		Env:                   r.envs,
		Secrets:               task.Secrets,
		GitHubInstance:        r.client.Address(),
		AutoRemove:            true,
		NoSkipCheckout:        true,
		PresetGitHubContext:   preset,
		EventJSON:             string(eventJSON),
		ContainerNamePrefix:   fmt.Sprintf("GITEA-ACTIONS-TASK-%d", task.Id),
		ContainerMaxLifetime:  maxLifetime,
		ContainerNetworkMode:  r.cfg.Container.NetworkMode,
		DefaultActionInstance: taskContext["gitea_default_actions_url"].GetStringValue(),
		PlatformPicker:        r.labels.PickPlatform,
	}

	rr, err := runner.New(runnerConfig)
	if err != nil {
		return err
	}
	executor := rr.NewPlanExecutor(plan)

	reporter.Logf("workflow prepared")

	// add logger recorders
	ctx = common.WithLoggerHook(ctx, reporter)

	return executor(ctx)
}