package classes_test

import (
	"math"
	"slices"
	"strings"
	"testing"

	"git.golem15.com/golem15/sm-quizzes-plugin/classes"
)

// TestCheckReviewStatus: "" and open list the three unreviewed statuses,
// a grading status lists itself, all lists everything (nil), and any
// other value is a problem naming the valid values.
func TestCheckReviewStatus(t *testing.T) {
	open := []string{"pending", "graded", "failed"}
	for in, want := range map[string][]string{
		"":         open,
		"open":     open,
		" open ":   open,
		"pending":  {"pending"},
		"graded":   {"graded"},
		"failed":   {"failed"},
		"reviewed": {"reviewed"},
		"all":      nil,
	} {
		got, problems := classes.CheckReviewStatus(in)
		if len(problems) != 0 {
			t.Errorf("%q: problems %v", in, problems)
		}
		if !slices.Equal(got, want) || (want == nil) != (got == nil) {
			t.Errorf("%q = %v, want %v", in, got, want)
		}
	}
	for _, in := range []string{"done", "Open", "pending,graded"} {
		got, problems := classes.CheckReviewStatus(in)
		if got != nil || len(problems) != 1 || !strings.Contains(problems[0], "open, pending, graded, failed, reviewed, all") {
			t.Errorf("%q = %v %v, want one problem listing the valid values", in, got, problems)
		}
	}
}

// TestCheckReviewPoints: 0..points in steps of 0.5, finite.
func TestCheckReviewPoints(t *testing.T) {
	for _, tc := range []struct {
		p    float64
		max  int
		want bool
	}{
		{0, 2, true}, {1.5, 2, true}, {2, 2, true}, {0, 0, true}, {0.5, 1, true},
		{-0.5, 2, false}, {2.5, 2, false}, {1.25, 2, false}, {0.1, 2, false},
		{math.NaN(), 2, false}, {math.Inf(1), 2, false}, {math.Inf(-1), 2, false},
		{0.5, 0, false}, {0, -1, true}, {1, -1, false},
	} {
		if got := classes.CheckReviewPoints(tc.p, tc.max); got != tc.want {
			t.Errorf("CheckReviewPoints(%v, %d) = %v, want %v", tc.p, tc.max, got, tc.want)
		}
	}
}

// TestCheckReviewComment: trimmed, blank is no comment, NUL dropped,
// at most 2000 runes.
func TestCheckReviewComment(t *testing.T) {
	str := func(s string) *string { return &s }
	if got, p := classes.CheckReviewComment(nil); got != nil || p != nil {
		t.Errorf("nil = %v %v", got, p)
	}
	if got, p := classes.CheckReviewComment(str("   \n ")); got != nil || p != nil {
		t.Errorf("spaces = %v %v, want no comment", got, p)
	}
	if got, p := classes.CheckReviewComment(str("  Dobrze, ale\x00 brak przykładu. ")); got == nil || *got != "Dobrze, ale brak przykładu." || p != nil {
		t.Errorf("trimmed = %v %v", got, p)
	}
	max := strings.Repeat("ł", classes.MaxReviewComment)
	if got, p := classes.CheckReviewComment(&max); got == nil || *got != max || p != nil {
		t.Errorf("2000 runes refused: %v", p)
	}
	over := max + "x"
	if got, p := classes.CheckReviewComment(&over); got != nil || len(p) != 1 || p[0] != "comment must be at most 2000 characters" {
		t.Errorf("2001 runes = %v %v, want one problem", got, p)
	}
}

// TestCheckReviewScope: exactly one key; answer_id only for regrade.
func TestCheckReviewScope(t *testing.T) {
	regrade := "exactly one of answer_id, attempt_id and quiz is required"
	bulk := "exactly one of attempt_id and quiz is required"
	for name, tc := range map[string]struct {
		scope classes.ReviewScope
		allow bool
		want  string
	}{
		"regrade answer":       {classes.ReviewScope{AnswerID: 1}, true, ""},
		"regrade attempt":      {classes.ReviewScope{AttemptID: 1}, true, ""},
		"regrade quiz":         {classes.ReviewScope{QuizSlug: "q"}, true, ""},
		"regrade none":         {classes.ReviewScope{}, true, regrade},
		"regrade blank quiz":   {classes.ReviewScope{QuizSlug: "  "}, true, regrade},
		"regrade two":          {classes.ReviewScope{AnswerID: 1, QuizSlug: "q"}, true, regrade},
		"regrade three":        {classes.ReviewScope{AnswerID: 1, AttemptID: 2, QuizSlug: "q"}, true, regrade},
		"bulk attempt":         {classes.ReviewScope{AttemptID: 1}, false, ""},
		"bulk quiz":            {classes.ReviewScope{QuizSlug: "q"}, false, ""},
		"bulk none":            {classes.ReviewScope{}, false, bulk},
		"bulk two":             {classes.ReviewScope{AttemptID: 1, QuizSlug: "q"}, false, bulk},
		"bulk answer":          {classes.ReviewScope{AnswerID: 1}, false, bulk},
		"bulk answer and quiz": {classes.ReviewScope{AnswerID: 1, QuizSlug: "q"}, false, bulk},
	} {
		got := classes.CheckReviewScope(tc.scope, tc.allow)
		switch {
		case tc.want == "" && got != nil:
			t.Errorf("%s = %v, want no problem", name, got)
		case tc.want != "" && (len(got) != 1 || got[0] != tc.want):
			t.Errorf("%s = %v, want %q", name, got, tc.want)
		}
	}
}