package taskfile

import (
	"fmt"

	"gopkg.in/yaml.v3"

	"github.com/go-task/task/v3/internal/deepcopy"
)

// Cmd is a task command
type Cmd struct {
	Cmd         string
	Task        string
	For         *For
	Silent      bool
	Set         []string
	Shopt       []string
	Vars        *Vars
	IgnoreError bool
	Defer       bool
	Platforms   []*Platform
}

func (c *Cmd) DeepCopy() *Cmd {
	if c == nil {
		return nil
	}
	return &Cmd{
		Cmd:         c.Cmd,
		Task:        c.Task,
		For:         c.For.DeepCopy(),
		Silent:      c.Silent,
		Set:         deepcopy.Slice(c.Set),
		Shopt:       deepcopy.Slice(c.Shopt),
		Vars:        c.Vars.DeepCopy(),
		IgnoreError: c.IgnoreError,
		Defer:       c.Defer,
		Platforms:   deepcopy.Slice(c.Platforms),
	}
}

func (c *Cmd) UnmarshalYAML(node *yaml.Node) error {
	switch node.Kind {

	case yaml.ScalarNode:
		var cmd string
		if err := node.Decode(&cmd); err != nil {
			return err
		}
		c.Cmd = cmd
		return nil

	case yaml.MappingNode:

		// A command with additional options
		var cmdStruct struct {
			Cmd         string
			For         *For
			Silent      bool
			Set         []string
			Shopt       []string
			IgnoreError bool `yaml:"ignore_error"`
			Platforms   []*Platform
		}
		if err := node.Decode(&cmdStruct); err == nil && cmdStruct.Cmd != "" {
			c.Cmd = cmdStruct.Cmd
			c.For = cmdStruct.For
			c.Silent = cmdStruct.Silent
			c.Set = cmdStruct.Set
			c.Shopt = cmdStruct.Shopt
			c.IgnoreError = cmdStruct.IgnoreError
			c.Platforms = cmdStruct.Platforms
			return nil
		}

		// A deferred command
		var deferredCmd struct {
			Defer string
		}
		if err := node.Decode(&deferredCmd); err == nil && deferredCmd.Defer != "" {
			c.Defer = true
			c.Cmd = deferredCmd.Defer
			return nil
		}

		// A deferred task call
		var deferredCall struct {
			Defer Call
		}
		if err := node.Decode(&deferredCall); err == nil && deferredCall.Defer.Task != "" {
			c.Defer = true
			c.Task = deferredCall.Defer.Task
			c.Vars = deferredCall.Defer.Vars
			return nil
		}

		// A task call
		var taskCall struct {
			Task   string
			Vars   *Vars
			For    *For
			Silent bool
		}
		if err := node.Decode(&taskCall); err == nil && taskCall.Task != "" {
			c.Task = taskCall.Task
			c.Vars = taskCall.Vars
			c.For = taskCall.For
			c.Silent = taskCall.Silent
			return nil
		}

		return fmt.Errorf("yaml: line %d: invalid keys in command", node.Line)
	}

	return fmt.Errorf("yaml: line %d: cannot unmarshal %s into command", node.Line, node.ShortTag())
}