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package planr

import (
	"log"
	"os"
        "path"
)

type Runner struct {
  adapters    []Adapter
  dirs        DirConfig
}

func (r *Runner) RegisterAdapter(a Adapter) {
  r.adapters = append(r.adapters, a)
}

func (r Runner) adapterCfgs() []AdapterConfig {
  cgs := make([]AdapterConfig, len(r.adapters))
  
  for _, adapter := range r.adapters {
    cgs = append(cgs, adapter.Config())
  }

  return cgs
}

type tcTab map[string] []*TestCase

func (r Runner) buildTcLUT(tcs []TestCase) tcTab {
  m := make(tcTab, 0)

  for i := range tcs {
    tc := &tcs[i]
    nm := *tc.Config.Adapter
    m[nm] = append(m[nm], tc)
  }

  return m 
}

func (r Runner) checkConfig(tcs []TestCase) {
  for _, tc := range tcs {
    tc.Config.ensureSatisfied(tc.Path)
  }
}

func (r Runner) setupEnv(adapter Adapter) {
  nm := adapter.Config().Name
  wd := path.Join(r.dirs.Build(), nm)

  if !directoryExists(wd) {
    if err := os.Mkdir(wd, 0755); err != nil {
      log.Fatalf("Could not create adapter config %s %v\n", wd, err)
    }
  } 
  
  safeCd(wd)
}

func (r Runner) build(tcs []TestCase) {
  r.checkConfig(tcs)

  tcTab := r.buildTcLUT(tcs)

  for _, adapter := range r.adapters {
    nm := adapter.Config().Name
    r.setupEnv(adapter)

    adapter.Build(tcTab[nm])
  }

  safeCd(r.dirs.Config())
}

func (r Runner) init_adapters() {
  for _, adapter := range r.adapters {
    adapter.Init(r.dirs)
  }
}

func (r Runner) units() []TestCase {
  return collectUnits(r.dirs.Rubric(), r.adapterCfgs())
}

func (r Runner) Build() {
  r.init_adapters()

  units := r.units()

  if !directoryExists(r.dirs.Build()) {
    r.dirs.MkBuild()
  }

  r.build(units)
}

func (r Runner) evaluate(tcs []TestCase) {
  tcTab := r.buildTcLUT(tcs)
  
  for _, adapter := range r.adapters {
    nm := adapter.Config().Name
    
    r.setupEnv(adapter)
    adapter.Evaluate(tcTab[nm])
  }

  safeCd(r.dirs.Config())
}

func (r Runner) Evaluate() []TestCase {
  r.init_adapters()

  units := r.units()

  r.evaluate(units)

  return units
}

func (r Runner) Clean() {
  r.dirs.CleanBuild()
}

func (r * Runner) SetConfigDirFromTree(childPath string) {
  r.dirs.SetConfigFromTree(childPath)
}

func (r * Runner) SetBuildDir(dir string) {
  r.dirs.SetBuild(dir)
}

func (r * Runner) SetConfigDir(dir string) {
  r.dirs.SetConfig(dir)
}

func (r * Runner) SetSrcDir(dir string) {
  r.dirs.SetSrc(dir)
}

func (r Runner) BuildDir() string {
  return r.dirs.Build();
}

func (r Runner) ConfigDir() string {
  return r.dirs.Config()
}

func (r Runner) SrcDir() string {
  return r.dirs.Src()
}