package recipe

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

const sample = `# a comment
task: spotify_play
description: Search Spotify for a song and play it.
app: com.spotify.music
param: query
row_id: com.spotify.music:id/row_root
step_timeout: 20s
total_timeout: 150s

guard "Log in" => Spotify is signed out
guard "Update Spotify" => Spotify wants an update

steps:
  - launch
  - wait "Search" 30s
  - tap "Search"
  - tap_if "Clear search query"
  - wait_gone "Recents" 30s
  - type "{query}"
  - tap_row "{query}" 40s
  - wait exact "Pause" 40s
  - key enter
  - sleep 1s
`

func TestParseSampleRecipe(t *testing.T) {
	rec, err := Parse(sample)
	if err != nil {
		t.Fatalf("Parse: %v", err)
	}
	if rec.Task != "spotify_play" || rec.App != "com.spotify.music" {
		t.Fatalf("unexpected header: %+v", rec)
	}
	if len(rec.Params) != 1 || rec.Params[0] != "query" {
		t.Fatalf("params = %v", rec.Params)
	}
	if rec.StepTimeout != 20*time.Second || rec.TotalTimeout != 150*time.Second {
		t.Fatalf("timeouts = %s / %s", rec.StepTimeout, rec.TotalTimeout)
	}
	if len(rec.Guards) != 2 || rec.Guards[0].Text != "Log in" || rec.Guards[0].Reason != "Spotify is signed out" {
		t.Fatalf("guards = %+v", rec.Guards)
	}
	if len(rec.Steps) != 10 {
		t.Fatalf("steps = %d, want 10", len(rec.Steps))
	}

	wait := rec.Steps[1]
	if wait.Verb != "wait" || wait.Args[0] != "Search" || wait.Timeout != 30*time.Second {
		t.Fatalf("wait step = %+v", wait)
	}
	exact := rec.Steps[7]
	if exact.Verb != "wait" || !exact.Exact || exact.Args[0] != "Pause" || exact.Timeout != 40*time.Second {
		t.Fatalf("exact wait step = %+v", exact)
	}
	sleep := rec.Steps[9]
	if sleep.Verb != "sleep" || sleep.Timeout != time.Second {
		t.Fatalf("sleep step = %+v", sleep)
	}
}

func TestParseRejectsBadInput(t *testing.T) {
	cases := map[string]string{
		"unknown verb":     "steps:\n  - teleport \"Home\"\n",
		"missing settings": "steps:\n  - wait \"x\"\n  - frobnicate: 3\n",
		"bad duration":     "step_timeout: soon\nsteps:\n  - wait \"x\"\n",
		"no steps":         "task: nothing\n",
		"guard needs text": "guard only a reason => nope\nsteps:\n  - home\n",
		"guard needs why":  "guard \"Log in\" =>\nsteps:\n  - home\n",
		"unknown key name": "steps:\n  - key volup\n",
		"unclosed quote":   "steps:\n  - wait \"Search\n",
		"too many args":    "steps:\n  - type \"a\" \"b\"\n",
		"unknown setting":  "colour: blue\nsteps:\n  - home\n",
	}
	for name, src := range cases {
		if _, err := Parse(src); err == nil {
			t.Errorf("%s: expected a parse error", name)
		}
	}
}

func TestSubstitute(t *testing.T) {
	got, err := Substitute("play {query} now", map[string]string{"query": "Honky Tonk Women"})
	if err != nil {
		t.Fatalf("Substitute: %v", err)
	}
	if got != "play Honky Tonk Women now" {
		t.Fatalf("Substitute = %q", got)
	}
	for _, bad := range []map[string]string{{}, {"query": "  "}} {
		if _, err := Substitute("{query}", bad); err == nil {
			t.Fatalf("expected an error for params %v", bad)
		}
	}
	if _, err := Substitute("{other}", map[string]string{"query": "x"}); err == nil {
		t.Fatal("expected an error for an undeclared placeholder")
	}
}

func TestMissingParams(t *testing.T) {
	rec, err := Parse(sample)
	if err != nil {
		t.Fatalf("Parse: %v", err)
	}
	if got := rec.MissingParams(map[string]string{"query": "x"}); len(got) != 0 {
		t.Fatalf("MissingParams = %v", got)
	}
	if got := rec.MissingParams(nil); len(got) != 1 || got[0] != "query" {
		t.Fatalf("MissingParams = %v", got)
	}
}

func TestParseRecipeWithoutTimeoutsUsesDefaults(t *testing.T) {
	rec, err := Parse("steps:\n  - home\n")
	if err != nil {
		t.Fatalf("Parse: %v", err)
	}
	if rec.StepTimeout != DefaultStepTimeout || rec.TotalTimeout != DefaultTotalTimeout {
		t.Fatalf("defaults = %s / %s", rec.StepTimeout, rec.TotalTimeout)
	}
}

// TestSpotifyRecipeIsValid keeps the shipped recipe honest: a typo in
// recipes/spotify_play.recipe fails the test suite, not the phone.
func TestSpotifyRecipeIsValid(t *testing.T) {
	dir := filepath.Join("..", "..", "recipes")
	rec, err := Load(filepath.Join(dir, "spotify_play.recipe"))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if rec.Task != "spotify_play" {
		t.Fatalf("task = %q", rec.Task)
	}
	if rec.App != "com.spotify.music" {
		t.Fatalf("app = %q", rec.App)
	}
	if len(rec.MissingParams(map[string]string{"query": "x"})) != 0 {
		t.Fatal("spotify_play must accept a query parameter")
	}
	if len(rec.Guards) < 3 {
		t.Fatalf("spotify_play needs guards for its bad screens, got %d", len(rec.Guards))
	}
	// Every step must be runnable: the parsed steps are what the engine gets.
	for i, s := range rec.Steps {
		if _, ok := verbs[s.Verb]; !ok {
			t.Fatalf("step %d uses unknown verb %q", i+1, s.Verb)
		}
	}
	// The recipe must wait for playback, not assume it.
	last := rec.Steps[len(rec.Steps)-1]
	if last.Verb != "wait" || last.Args[0] != "Pause" {
		t.Fatalf("the last step must confirm playback, got %+v", last)
	}
}

func TestLoadAndList(t *testing.T) {
	dir := t.TempDir()
	write := func(name, body string) {
		t.Helper()
		if err := os.WriteFile(filepath.Join(dir, name), []byte(body), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	write("b.recipe", "task: beta\nsteps:\n  - home\n")
	write("a.recipe", "task: alpha\nsteps:\n  - home\n")

	list, err := List(dir)
	if err != nil {
		t.Fatalf("List: %v", err)
	}
	if len(list) != 2 || list[0].Task != "alpha" || list[1].Task != "beta" {
		t.Fatalf("List = %+v", list)
	}

	rec, err := Find(dir, "beta")
	if err != nil {
		t.Fatalf("Find: %v", err)
	}
	if rec.Task != "beta" {
		t.Fatalf("Find = %+v", rec)
	}
	if _, err := Find(dir, "gamma"); err == nil || !strings.Contains(err.Error(), "alpha") {
		t.Fatalf("Find unknown task: %v", err)
	}
}