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

package actions

import (
	"context"
	"errors"
	"fmt"
	"strings"
	"time"

	"gitea.dev/models/db"
	repo_model "gitea.dev/models/repo"
	user_model "gitea.dev/models/user"
	"gitea.dev/modules/git"
	"gitea.dev/modules/json"
	"gitea.dev/modules/log"
	"gitea.dev/modules/setting"
	api "gitea.dev/modules/structs"
	"gitea.dev/modules/timeutil"
	"gitea.dev/modules/util"
	webhook_module "gitea.dev/modules/webhook"
)

// ActionRun represents a run of a workflow file
type ActionRun struct {
	ID                int64
	Title             string
	RepoID            int64                  `xorm:"unique(repo_index)"`
	Repo              *repo_model.Repository `xorm:"-"`
	OwnerID           int64                  `xorm:"index"`
	WorkflowID        string                 `xorm:"index"`                    // the name of workflow file
	Index             int64                  `xorm:"index unique(repo_index)"` // a unique number for each run of a repository
	TriggerUserID     int64                  `xorm:"index"`
	TriggerUser       *user_model.User       `xorm:"-"`
	ScheduleID        int64
	Ref               string `xorm:"index"` // the commit/tag/… that caused the run
	IsRefDeleted      bool   `xorm:"-"`
	CommitSHA         string
	IsForkPullRequest bool                         // If this is triggered by a PR from a forked repository or an untrusted user, we need to check if it is approved and limit permissions when running the workflow.
	NeedApproval      bool                         // may need approval if it's a fork pull request
	ApprovedBy        int64                        `xorm:"index"` // who approved
	Event             webhook_module.HookEventType // the webhook event that causes the workflow to run
	EventPayload      string                       `xorm:"LONGTEXT"`
	TriggerEvent      string                       // the trigger event defined in the `on` configuration of the triggered workflow
	Status            Status                       `xorm:"index"`
	Version           int                          `xorm:"version default 0"` // Status could be updated concomitantly, so an optimistic lock is needed
	RawConcurrency    string                       // raw concurrency

	// Started and Stopped are identical to the latest attempt after ActionRunAttempt was introduced.
	// When a rerun creates a new latest attempt, they are reset until the new attempt starts and stops.
	Started timeutil.TimeStamp
	Stopped timeutil.TimeStamp

	// PreviousDuration is kept only for legacy runs created before ActionRunAttempt existed.
	// New runs and reruns no longer update this field and use attempt-scoped durations instead.
	PreviousDuration time.Duration

	LatestAttemptID int64 `xorm:"index NOT NULL DEFAULT 0"`

	Created timeutil.TimeStamp `xorm:"created"`
	Updated timeutil.TimeStamp `xorm:"updated"`
}

func init() {
	db.RegisterModel(new(ActionRun))
	db.RegisterModel(new(ActionRunIndex))
}

func (run *ActionRun) HTMLURL(ctxOpt ...context.Context) string {
	if run.Repo == nil {
		return ""
	}
	return fmt.Sprintf("%s/actions/runs/%d", run.Repo.HTMLURL(ctxOpt...), run.ID)
}

func (run *ActionRun) Link() string {
	if run.Repo == nil {
		return ""
	}
	return fmt.Sprintf("%s/actions/runs/%d", run.Repo.Link(), run.ID)
}

func (run *ActionRun) WorkflowLink() string {
	if run.Repo == nil {
		return ""
	}
	return fmt.Sprintf("%s/actions/?workflow=%s", run.Repo.Link(), run.WorkflowID)
}

// RefLink return the url of run's ref
func (run *ActionRun) RefLink() string {
	refName := git.RefName(run.Ref)
	if refName.IsPull() {
		return run.Repo.Link() + "/pulls/" + refName.ShortName()
	}
	return run.Repo.Link() + "/src/" + refName.RefWebLinkPath()
}

// PrettyRef return #id for pull ref or ShortName for others
func (run *ActionRun) PrettyRef() string {
	refName := git.RefName(run.Ref)
	if refName.IsPull() {
		return "#" + strings.TrimSuffix(strings.TrimPrefix(run.Ref, git.PullPrefix), "/head")
	}
	return refName.ShortName()
}

// RefTooltip return a tooltop of run's ref. For pull request, it's the title of the PR, otherwise it's the ShortName.
func (run *ActionRun) RefTooltip() string {
	payload, err := run.GetPullRequestEventPayload()
	if err == nil && payload != nil && payload.PullRequest != nil {
		return payload.PullRequest.Title
	}
	return git.RefName(run.Ref).ShortName()
}

// LoadAttributes load Repo TriggerUser if not loaded
func (run *ActionRun) LoadAttributes(ctx context.Context) error {
	if err := run.LoadRepo(ctx); err != nil {
		return err
	}

	if err := run.Repo.LoadAttributes(ctx); err != nil {
		return err
	}

	return run.LoadTriggerUser(ctx)
}

func (run *ActionRun) LoadTriggerUser(ctx context.Context) (err error) {
	if run.TriggerUser != nil {
		return nil
	}
	run.TriggerUserID, run.TriggerUser, err = user_model.GetPossibleUserByID(ctx, run.TriggerUserID)
	return err
}

func (run *ActionRun) LoadRepo(ctx context.Context) error {
	if run.Repo != nil {
		return nil
	}

	repo, err := repo_model.GetRepositoryByID(ctx, run.RepoID)
	if err != nil {
		return err
	}
	run.Repo = repo
	return nil
}

func (run *ActionRun) Duration() time.Duration {
	d := calculateDuration(run.Started, run.Stopped, run.Status, run.Updated) + run.PreviousDuration
	if d < 0 {
		return 0
	}
	return d
}

// GetLatestAttempt returns
//   - the latest attempt of the run
//   - (nil, false, nil) for legacy runs that have no attempt records
func (run *ActionRun) GetLatestAttempt(ctx context.Context) (*ActionRunAttempt, bool, error) {
	if run.LatestAttemptID == 0 {
		return nil, false, nil
	}
	attempt, err := GetRunAttemptByRepoAndID(ctx, run.RepoID, run.LatestAttemptID)
	if err != nil {
		return nil, false, err
	}
	return attempt, true, nil
}

func (run *ActionRun) GetEffectiveConcurrency(ctx context.Context) (string, bool, error) {
	attempt, has, err := run.GetLatestAttempt(ctx)
	if err != nil {
		return "", false, err
	}
	if has {
		return attempt.ConcurrencyGroup, attempt.ConcurrencyCancel, nil
	}
	return "", false, nil
}

func (run *ActionRun) GetPushEventPayload() (*api.PushPayload, error) {
	if run.Event == webhook_module.HookEventPush {
		var payload api.PushPayload
		if err := json.Unmarshal([]byte(run.EventPayload), &payload); err != nil {
			return nil, err
		}
		return &payload, nil
	}
	return nil, fmt.Errorf("event %s is not a push event", run.Event)
}

func (run *ActionRun) GetPullRequestEventPayload() (*api.PullRequestPayload, error) {
	if run.Event.IsPullRequest() || run.Event.IsPullRequestReview() {
		var payload api.PullRequestPayload
		if err := json.Unmarshal([]byte(run.EventPayload), &payload); err != nil {
			return nil, err
		}
		return &payload, nil
	}
	return nil, fmt.Errorf("event %s is not a pull request event", run.Event)
}

func (run *ActionRun) GetWorkflowRunEventPayload() (*api.WorkflowRunPayload, error) {
	if run.Event == webhook_module.HookEventWorkflowRun {
		var payload api.WorkflowRunPayload
		if err := json.Unmarshal([]byte(run.EventPayload), &payload); err != nil {
			return nil, err
		}
		return &payload, nil
	}
	return nil, fmt.Errorf("event %s is not a workflow run event", run.Event)
}

func (run *ActionRun) IsSchedule() bool {
	return run.ScheduleID > 0
}

// UpdateRepoRunsNumbers updates the number of runs and closed runs of a repository.
// Callers MUST invoke this from outside any transaction that has X-locked action_run rows for the same repo, otherwise, transaction deadlock
func UpdateRepoRunsNumbers(ctx context.Context, repoID int64) {
	if db.InTransaction(ctx) {
		setting.PanicInDevOrTesting("UpdateRepoRunsNumbers must not be called inside a transaction")
	}

	e := db.GetEngine(ctx)

	numActionRuns, err := e.Where("repo_id = ?", repoID).Count(new(ActionRun))
	if err != nil {
		log.Error("UpdateRepoRunsNumbers count num_action_runs for repo %d: %v", repoID, err)
		return
	}

	numClosedActionRuns, err := e.Where("repo_id = ?", repoID).
		In("status", StatusSuccess, StatusFailure, StatusCancelled, StatusSkipped).
		Count(new(ActionRun))
	if err != nil {
		log.Error("UpdateRepoRunsNumbers count num_closed_action_runs for repo %d: %v", repoID, err)
		return
	}

	if _, err := e.ID(repoID).Cols("num_action_runs", "num_closed_action_runs").NoAutoTime().Update(&repo_model.Repository{
		NumActionRuns:       int(numActionRuns),
		NumClosedActionRuns: int(numClosedActionRuns),
	}); err != nil {
		log.Error("UpdateRepoRunsNumbers update repo %d: %v", repoID, err)
	}
}

func GetRunByRepoAndID(ctx context.Context, repoID, runID int64) (*ActionRun, error) {
	var run ActionRun
	has, err := db.GetEngine(ctx).Where("id=? AND repo_id=?", runID, repoID).Get(&run)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, fmt.Errorf("run with id %d: %w", runID, util.ErrNotExist)
	}

	return &run, nil
}

func GetRunByRepoAndIndex(ctx context.Context, repoID, runIndex int64) (*ActionRun, error) {
	run := &ActionRun{
		RepoID: repoID,
		Index:  runIndex,
	}
	has, err := db.GetEngine(ctx).Get(run)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, fmt.Errorf("run with repo_id %d and index %d: %w", repoID, runIndex, util.ErrNotExist)
	}

	return run, nil
}

func GetLatestRun(ctx context.Context, repoID int64) (*ActionRun, error) {
	run := &ActionRun{
		RepoID: repoID,
	}
	has, err := db.GetEngine(ctx).Where("repo_id=?", repoID).Desc("index").Get(run)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, fmt.Errorf("latest run with repo_id %d: %w", repoID, util.ErrNotExist)
	}
	return run, nil
}

func GetWorkflowLatestRun(ctx context.Context, repoID int64, workflowFile, branch, event string) (*ActionRun, error) {
	var run ActionRun
	q := db.GetEngine(ctx).Where("repo_id=?", repoID).
		And("ref = ?", branch).
		And("workflow_id = ?", workflowFile)
	if event != "" {
		q.And("event = ?", event)
	}
	has, err := q.Desc("id").Get(&run)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, util.NewNotExistErrorf("run with repo_id %d, ref %s, workflow_id %s", repoID, branch, workflowFile)
	}
	return &run, nil
}

// UpdateRun updates a run.
// It requires the inputted run has Version set.
// It will return error if the version is not matched (it means the run has been changed after loaded).
func UpdateRun(ctx context.Context, run *ActionRun, cols ...string) error {
	sess := db.GetEngine(ctx).ID(run.ID)
	if len(cols) > 0 {
		sess.Cols(cols...)
	}
	run.Title = util.EllipsisDisplayString(run.Title, 255)
	affected, err := sess.Update(run)
	if err != nil {
		return err
	}
	if affected == 0 {
		return errors.New("run has changed")
		// It's impossible that the run is not found, since Gitea never deletes runs.
	}

	return nil
}

type ActionRunIndex db.ResourceIndex

// GetConcurrentRunAttemptsAndJobs returns run attempts and jobs in the same concurrency group by statuses.
func GetConcurrentRunAttemptsAndJobs(ctx context.Context, repoID int64, concurrencyGroup string, status []Status) ([]*ActionRunAttempt, []*ActionRunJob, error) {
	attempts, err := FindConcurrentRunAttempts(ctx, repoID, concurrencyGroup, status)
	if err != nil {
		return nil, nil, fmt.Errorf("find run attempts: %w", err)
	}

	jobs, err := db.Find[ActionRunJob](ctx, &FindRunJobOptions{
		RepoID:           repoID,
		ConcurrencyGroup: concurrencyGroup,
		Statuses:         status,
	})
	if err != nil {
		return nil, nil, fmt.Errorf("find jobs: %w", err)
	}

	return attempts, jobs, nil
}

func CancelPreviousJobsByRunConcurrency(ctx context.Context, attempt *ActionRunAttempt) ([]*ActionRunJob, error) {
	if attempt.ConcurrencyGroup == "" {
		return nil, nil
	}

	var jobsToCancel []*ActionRunJob

	statusFindOption := []Status{StatusWaiting, StatusBlocked}
	if attempt.ConcurrencyCancel {
		statusFindOption = append(statusFindOption, StatusRunning)
		statusFindOption = append(statusFindOption, StatusCancelling)
	}
	attempts, jobs, err := GetConcurrentRunAttemptsAndJobs(ctx, attempt.RepoID, attempt.ConcurrencyGroup, statusFindOption)
	if err != nil {
		return nil, fmt.Errorf("find concurrent runs and jobs: %w", err)
	}
	jobsToCancel = append(jobsToCancel, jobs...)

	// cancel runs in the same concurrency group
	for _, concurrentAttempt := range attempts {
		if concurrentAttempt.RunID == attempt.RunID {
			continue
		}
		jobs, err := GetRunJobsByRunAndAttemptID(ctx, concurrentAttempt.RunID, concurrentAttempt.ID)
		if err != nil {
			return nil, fmt.Errorf("find run %d attempt %d jobs: %w", concurrentAttempt.RunID, concurrentAttempt.ID, err)
		}
		jobsToCancel = append(jobsToCancel, jobs...)
	}

	return CancelJobs(ctx, jobsToCancel)
}
