package vmx

import (
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	vmwcommon "github.com/hashicorp/packer/builder/vmware/common"
	"github.com/hashicorp/packer/common"
	"github.com/hashicorp/packer/helper/communicator"
	"github.com/hashicorp/packer/helper/multistep"
	"github.com/hashicorp/packer/packer"
)

// Builder implements packer.Builder and builds the actual VMware
// images.
type Builder struct {
	config *Config
	runner multistep.Runner
}

// Prepare processes the build configuration parameters.
func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
	c, warnings, errs := NewConfig(raws...)
	if errs != nil {
		return warnings, errs
	}
	b.config = c

	return warnings, nil
}

// Run executes a Packer build and returns a packer.Artifact representing
// a VMware image.
func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (packer.Artifact, error) {
	driver, err := vmwcommon.NewDriver(&b.config.DriverConfig, &b.config.SSHConfig, b.config.VMName)
	if err != nil {
		return nil, fmt.Errorf("Failed creating VMware driver: %s", err)
	}

	// Determine the output dir implementation
	var dir vmwcommon.OutputDir
	switch d := driver.(type) {
	case vmwcommon.OutputDir:
		dir = d
	default:
		dir = new(vmwcommon.LocalOutputDir)
	}

	// The OutputDir will track remote esxi output; exportOutputPath preserves
	// the path to the output on the machine running Packer.
	exportOutputPath := b.config.OutputDir

	if b.config.RemoteType != "" {
		b.config.OutputDir = b.config.VMName
	}
	dir.SetOutputDir(b.config.OutputDir)

	// Set up the state.
	state := new(multistep.BasicStateBag)
	state.Put("config", b.config)
	state.Put("debug", b.config.PackerDebug)
	state.Put("dir", dir)
	state.Put("driver", driver)
	state.Put("hook", hook)
	state.Put("ui", ui)
	state.Put("sshConfig", &b.config.SSHConfig)
	state.Put("driverConfig", &b.config.DriverConfig)
	state.Put("temporaryDevices", []string{}) // Devices (in .vmx) created by packer during building

	// Build the steps.
	steps := []multistep.Step{
		&vmwcommon.StepPrepareTools{
			RemoteType:        b.config.RemoteType,
			ToolsUploadFlavor: b.config.ToolsUploadFlavor,
		},
		&vmwcommon.StepOutputDir{
			Force: b.config.PackerForce,
		},
		&common.StepCreateFloppy{
			Files:       b.config.FloppyConfig.FloppyFiles,
			Directories: b.config.FloppyConfig.FloppyDirectories,
		},
		&StepCloneVMX{
			OutputDir: b.config.OutputDir,
			Path:      b.config.SourcePath,
			VMName:    b.config.VMName,
			Linked:    b.config.Linked,
		},
		&vmwcommon.StepConfigureVMX{
			CustomData:  b.config.VMXData,
			VMName:      b.config.VMName,
			DisplayName: b.config.VMXDisplayName,
		},
		&vmwcommon.StepSuppressMessages{},
		&common.StepHTTPServer{
			HTTPDir:     b.config.HTTPDir,
			HTTPPortMin: b.config.HTTPPortMin,
			HTTPPortMax: b.config.HTTPPortMax,
		},
		&vmwcommon.StepUploadVMX{
			RemoteType: b.config.RemoteType,
		},
		&vmwcommon.StepConfigureVNC{
			Enabled:            !b.config.DisableVNC,
			VNCBindAddress:     b.config.VNCBindAddress,
			VNCPortMin:         b.config.VNCPortMin,
			VNCPortMax:         b.config.VNCPortMax,
			VNCDisablePassword: b.config.VNCDisablePassword,
		},
		&vmwcommon.StepRegister{
			Format:         b.config.Format,
			KeepRegistered: b.config.KeepRegistered,
			SkipExport:     b.config.SkipExport,
		},
		&vmwcommon.StepRun{
			DurationBeforeStop: 5 * time.Second,
			Headless:           b.config.Headless,
		},
		&vmwcommon.StepTypeBootCommand{
			BootWait:    b.config.BootWait,
			VNCEnabled:  !b.config.DisableVNC,
			BootCommand: b.config.FlatBootCommand(),
			VMName:      b.config.VMName,
			Ctx:         b.config.ctx,
			KeyInterval: b.config.VNCConfig.BootKeyInterval,
		},
		&communicator.StepConnect{
			Config:    &b.config.SSHConfig.Comm,
			Host:      driver.CommHost,
			SSHConfig: b.config.SSHConfig.Comm.SSHConfigFunc(),
		},
		&vmwcommon.StepUploadTools{
			RemoteType:        b.config.RemoteType,
			ToolsUploadFlavor: b.config.ToolsUploadFlavor,
			ToolsUploadPath:   b.config.ToolsUploadPath,
			Ctx:               b.config.ctx,
		},
		&common.StepProvision{},
		&common.StepCleanupTempKeys{
			Comm: &b.config.SSHConfig.Comm,
		},
		&vmwcommon.StepShutdown{
			Command: b.config.ShutdownCommand,
			Timeout: b.config.ShutdownTimeout,
		},
		&vmwcommon.StepCleanFiles{},
		&vmwcommon.StepCompactDisk{
			Skip: b.config.SkipCompaction,
		},
		&vmwcommon.StepConfigureVMX{
			CustomData:  b.config.VMXDataPost,
			SkipFloppy:  true,
			VMName:      b.config.VMName,
			DisplayName: b.config.VMXDisplayName,
		},
		&vmwcommon.StepCleanVMX{
			RemoveEthernetInterfaces: b.config.VMXConfig.VMXRemoveEthernet,
			VNCEnabled:               !b.config.DisableVNC,
		},
		&vmwcommon.StepUploadVMX{
			RemoteType: b.config.RemoteType,
		},
		&vmwcommon.StepExport{
			Format:         b.config.Format,
			SkipExport:     b.config.SkipExport,
			VMName:         b.config.VMName,
			OVFToolOptions: b.config.OVFToolOptions,
			OutputDir:      exportOutputPath,
		},
	}

	// Run the steps.
	b.runner = common.NewRunnerWithPauseFn(steps, b.config.PackerConfig, ui, state)
	b.runner.Run(ctx, state)

	// Report any errors.
	if rawErr, ok := state.GetOk("error"); ok {
		return nil, rawErr.(error)
	}

	// If we were interrupted or cancelled, then just exit.
	if _, ok := state.GetOk(multistep.StateCancelled); ok {
		return nil, errors.New("Build was cancelled.")
	}

	if _, ok := state.GetOk(multistep.StateHalted); ok {
		return nil, errors.New("Build was halted.")
	}

	// Artifact
	log.Printf("Generating artifact...")
	return vmwcommon.NewArtifact(b.config.RemoteType, b.config.Format, exportOutputPath,
		b.config.VMName, b.config.SkipExport, b.config.KeepRegistered, state)
}

// Cancel.