package events

import (
	"fmt"
	"strings"

	"github.com/google/uuid"
	"github.com/runatlantis/atlantis/server/core/config/valid"
	"github.com/runatlantis/atlantis/server/core/runtime"
	"github.com/runatlantis/atlantis/server/events/command"
	"github.com/runatlantis/atlantis/server/events/models"
	"github.com/runatlantis/atlantis/server/events/vcs"
)

//go:generate pegomock generate --package mocks -o mocks/mock_pre_workflow_hook_url_generator.go PreWorkflowHookURLGenerator

// PreWorkflowHookURLGenerator generates urls to view the pre workflow progress.
type PreWorkflowHookURLGenerator interface {
	GenerateProjectWorkflowHookURL(hookID string) (string, error)
}

//go:generate pegomock generate --package mocks -o mocks/mock_pre_workflows_hooks_command_runner.go PreWorkflowHooksCommandRunner

type PreWorkflowHooksCommandRunner interface {
	RunPreHooks(ctx *command.Context, cmd *CommentCommand) error
}

// DefaultPreWorkflowHooksCommandRunner is the first step when processing a workflow hook commands.
type DefaultPreWorkflowHooksCommandRunner struct {
	VCSClient             vcs.Client                    `validate:"required"`
	WorkingDirLocker      WorkingDirLocker              `validate:"required"`
	WorkingDir            WorkingDir                    `validate:"required"`
	GlobalCfg             valid.GlobalCfg               `validate:"required"`
	PreWorkflowHookRunner runtime.PreWorkflowHookRunner `validate:"required"`
	CommitStatusUpdater   CommitStatusUpdater           `validate:"required"`
	Router                PreWorkflowHookURLGenerator   `validate:"required"`
}

// RunPreHooks runs pre_workflow_hooks when PR is opened or updated.
func (w *DefaultPreWorkflowHooksCommandRunner) RunPreHooks(ctx *command.Context, cmd *CommentCommand) error {
	preWorkflowHooks := make([]*valid.WorkflowHook, 0)
	for _, repo := range w.GlobalCfg.Repos {
		if repo.IDMatches(ctx.Pull.BaseRepo.ID()) && len(repo.PreWorkflowHooks) > 0 {
			preWorkflowHooks = append(preWorkflowHooks, repo.PreWorkflowHooks...)
		}
	}

	// short circuit any other calls if there are no pre-hooks configured
	if len(preWorkflowHooks) == 0 {
		return nil
	}

	ctx.Log.Info("Pre-workflow hooks configured, running...")

	unlockFn, err := w.WorkingDirLocker.TryLock(ctx.Pull.BaseRepo.FullName, ctx.Pull.Num, DefaultWorkspace, DefaultRepoRelDir)
	if err != nil {
		return err
	}
	ctx.Log.Debug("got workspace lock")
	defer unlockFn()

	repoDir, err := w.WorkingDir.Clone(ctx.Log, ctx.HeadRepo, ctx.Pull, DefaultWorkspace)
	if err != nil {
		return err
	}

	var escapedArgs []string
	if cmd != nil {
		escapedArgs = escapeArgs(cmd.Flags)
	}

	err = w.runHooks(
		models.WorkflowHookCommandContext{
			BaseRepo:           ctx.Pull.BaseRepo,
			HeadRepo:           ctx.HeadRepo,
			Log:                ctx.Log,
			Pull:               ctx.Pull,
			User:               ctx.User,
			Verbose:            false,
			EscapedCommentArgs: escapedArgs,
			CommandName:        cmd.Name.String(),
			API:                ctx.API,
		},
		preWorkflowHooks, repoDir)

	if err != nil {
		ctx.Log.Err("Error running pre-workflow hooks %s.", err)
		return err
	}

	ctx.Log.Info("Pre-workflow hooks completed successfully")

	return nil
}

func (w *DefaultPreWorkflowHooksCommandRunner) runHooks(
	ctx models.WorkflowHookCommandContext,
	preWorkflowHooks []*valid.WorkflowHook,
	repoDir string,
) error {
	for i, hook := range preWorkflowHooks {
		ctx.HookDescription = hook.StepDescription
		if ctx.HookDescription == "" {
			ctx.HookDescription = fmt.Sprintf("Pre workflow hook #%d", i)
		}

		ctx.HookStepName = fmt.Sprintf("pre %s #%d", ctx.CommandName, i)

		ctx.Log.Debug("Processing pre workflow hook '%s', Command '%s', Target commands [%s]",
			ctx.HookDescription, ctx.CommandName, hook.Commands)
		if hook.Commands != "" && !strings.Contains(hook.Commands, ctx.CommandName) {
			ctx.Log.Debug("Skipping pre workflow hook '%s' as command '%s' is not in Commands [%s]",
				ctx.HookDescription, ctx.CommandName, hook.Commands)
			continue
		}

		ctx.Log.Debug("Running pre workflow hook: '%s'", ctx.HookDescription)
		ctx.HookID = uuid.NewString()
		shell := hook.Shell
		if shell == "" {
			ctx.Log.Debug("Setting shell to default: '%s'", shell)
			shell = "sh"
		}
		shellArgs := hook.ShellArgs
		if shellArgs == "" {
			ctx.Log.Debug("Setting shellArgs to default: '%s'", shellArgs)
			shellArgs = "-c"
		}
		url, err := w.Router.GenerateProjectWorkflowHookURL(ctx.HookID)
		if err != nil && !ctx.API {
			return err
		}

		if err := w.CommitStatusUpdater.UpdatePreWorkflowHook(ctx.Log, ctx.Pull, models.PendingCommitStatus, ctx.HookDescription, "", url); err != nil {
			ctx.Log.Warn("unable to update pre workflow hook status: %s", err)
			ctx.Log.Info("is api? %v", ctx.API)
			if !ctx.API {
				ctx.Log.Info("is api? %v", ctx.API)
				return err
			}
		}

		_, runtimeDesc, err := w.PreWorkflowHookRunner.Run(ctx, hook.RunCommand, shell, shellArgs, repoDir)

		if err != nil {
			if err := w.CommitStatusUpdater.UpdatePreWorkflowHook(ctx.Log, ctx.Pull, models.FailedCommitStatus, ctx.HookDescription, runtimeDesc, url); err != nil {
				ctx.Log.Warn("unable to update pre workflow hook status: %s", err)
			}
			return err
		}

		if err := w.CommitStatusUpdater.UpdatePreWorkflowHook(ctx.Log, ctx.Pull, models.SuccessCommitStatus, ctx.HookDescription, runtimeDesc, url); err != nil {
			ctx.Log.Warn("unable to update pre workflow hook status: %s", err)
			if !ctx.API {
				return err
			}
		}
	}

	return nil
}