package task

import (
	"path/filepath"

	"github.com/go-task/task/internal/taskfile"
	"github.com/go-task/task/internal/templater"

	"mvdan.cc/sh/shell"
)

// CompiledTask returns a copy of a task, but replacing variables in almost all
// properties using the Go template package.
func (e *Executor) CompiledTask(call taskfile.Call) (*taskfile.Task, error) {
	origTask, ok := e.Taskfile.Tasks[call.Task]
	if !ok {
		return nil, &taskNotFoundError{call.Task}
	}

	vars, err := e.Compiler.GetVariables(origTask, call)
	if err != nil {
		return nil, err
	}
	r := templater.Templater{Vars: vars}

	new := taskfile.Task{
		Task:      origTask.Task,
		Desc:      r.Replace(origTask.Desc),
		Sources:   r.ReplaceSlice(origTask.Sources),
		Generates: r.ReplaceSlice(origTask.Generates),
		Status:    r.ReplaceSlice(origTask.Status),
		Dir:       r.Replace(origTask.Dir),
		Vars:      nil,
		Env:       r.ReplaceVars(origTask.Env),
		Silent:    origTask.Silent,
		Method:    r.Replace(origTask.Method),
		Prefix:    r.Replace(origTask.Prefix),
	}
	new.Dir, err = shell.Expand(new.Dir, nil)
	if err != nil {
		return nil, err
	}
	if e.Dir != "" && !filepath.IsAbs(new.Dir) {
		new.Dir = filepath.Join(e.Dir, new.Dir)
	}
	if new.Prefix == "" {
		new.Prefix = new.Task
	}
	for k, v := range new.Env {
		static, err := e.Compiler.HandleDynamicVar(v)
		if err != nil {
			return nil, err
		}
		new.Env[k] = taskfile.Var{Static: static}
	}

	if len(origTask.Cmds) > 0 {
		new.Cmds = make([]*taskfile.Cmd, len(origTask.Cmds))
		for i, cmd := range origTask.Cmds {
			new.Cmds[i] = &taskfile.Cmd{
				Task:   r.Replace(cmd.Task),
				Silent: cmd.Silent,
				Cmd:    r.Replace(cmd.Cmd),
				Vars:   r.ReplaceVars(cmd.Vars),
			}

		}
	}
	if len(origTask.Deps) > 0 {
		new.Deps = make([]*taskfile.Dep, len(origTask.Deps))
		for i, dep := range origTask.Deps {
			new.Deps[i] = &taskfile.Dep{
				Task: r.Replace(dep.Task),
				Vars: r.ReplaceVars(dep.Vars),
			}
		}
	}

	return &new, r.Err()
}