package eval

import (
	"context"
	"strings"
	"testing"

	"github.com/kami/maven/internal/loop"
	"github.com/kami/maven/internal/phraser"
)

func TestLoadFixture(t *testing.T) {
	f, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if _, err := f.Now(); err != nil {
		t.Fatalf("Now: %v", err)
	}
	seen := map[string]bool{}
	for _, c := range f.Cases {
		if seen[c.ID] {
			t.Errorf("duplicate case id %q", c.ID)
		}
		seen[c.ID] = true
		if c.Rule == "" || c.Severity < 1 || c.Severity > 4 {
			t.Errorf("%s: rule %q severity %d", c.ID, c.Rule, c.Severity)
		}
		if len(c.WantAny) == 0 {
			t.Errorf("%s: no want_any, the on-topic check would always pass", c.ID)
		}
	}
	// Coverage floor: all five loop rules plus both minted families, or the
	// fixture measures a subset and the score does not mean what it says.
	for _, rule := range []string{"water", "meal", "break", "service_down", "netdata_critical", "routine", "morning"} {
		found := false
		for _, c := range f.Cases {
			if ruleFamily(c.Rule) == rule {
				found = true
			}
		}
		if !found {
			t.Errorf("no case for rule family %q", rule)
		}
	}
}

// TestStubBaseline is the CI ratchet: the deterministic Stub, no model, no
// network. The floor is low on purpose — the Stub is English template phrasing,
// so it fails `lang` on every case by construction. The point of the ratchet is
// that the checks keep running and the Stub does not get worse, not that the
// Stub is good.
func TestStubBaseline(t *testing.T) {
	f, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	rep, err := Score(context.Background(), "stub (deterministic floor)", phraser.NewStub(), f)
	if err != nil {
		t.Fatalf("Score: %v", err)
	}
	t.Log("\n" + rep.String() + rep.Messages())

	if rep.Errors != 0 {
		t.Errorf("stub returned %d errors — the deterministic path must never fail", rep.Errors)
	}
	// Per-check ratchets rather than one composite: the Stub's composite is 0
	// (it never passes `lang`), so a composite floor would catch nothing.
	floors := map[string]int{
		CheckMood: 15,
		// 12, not 15: the Stub's `break` template genuinely runs past the
		// ceiling ("you've been at your desk for 4 hours without a break — step
		// away for a bit." is 76 chars but 16 words). Left failing rather than
		// raising the ceiling to hide it.
		CheckLength:    12,
		CheckFeminine:  15,
		CheckHisGender: 15,
		CheckAddress:   15,
		CheckCringe:    15,
		CheckOnTopic:   12,
	}
	for name, floor := range floors {
		if rep.ByCheck[name] < floor {
			t.Errorf("check %s: %d/%d, below ratchet %d — phrasing regressed",
				name, rep.ByCheck[name], rep.Total, floor)
		}
	}
}

// TestChecksCatchWhatTheyClaim — the checks are the measurement, so they get
// their own tests. Without these, a bad regexp would silently make every
// phrasing run look clean.
func TestChecksCatchWhatTheyClaim(t *testing.T) {
	water := Case{Rule: "water", WantAny: []string{"вод"}}

	cases := []struct {
		name string
		body string
		want string // the check that must fail, "" for a clean message
	}{
		{"clean", "уже четыре часа без воды — попей.", ""},
		{"long", "уже четыре часа без воды, а это довольно много, и вообще пить надо регулярно, иначе будет плохо совсем", CheckLength},
		{"english", "you haven't had water in 4 hours, drink something", CheckLang},
		{"masculine self", "я напомнил про воду.", CheckFeminine},
		{"masculine dropped pronoun", "напомнил тебе про воду.", CheckFeminine},
		{"masculine predicative", "я должен сказать: попей воды.", CheckFeminine},
		// The other direction: HE is male, so second-person masculine is right.
		{"second person masculine ok", "ты не пил воду четыре часа.", ""},
		// The real observed failure: she addressed him as a woman.
		{"feminine second person", "ты давно не отдыхала — попей воды.", CheckHisGender},
		{"feminine second person no dash", "ты пила воду четыре часа назад.", CheckHisGender},
		// Her own feminine verb next to "ты" is correct and must not be flagged.
		{"her feminine verb near ты", "я заметила, что ты не пил воду.", ""},
		{"her feminine verb about him", "напомнила тебе про воду.", ""},
		// A feminine noun subject in the same sentence is not him.
		{"feminine noun subject ok", "зарядка была утром, ты её пропустил, попей воды.", ""},
		{"feminine self ok", "я заметила: воды не было четыре часа.", ""},
		{"pet name", "милый, попей воды.", CheckCringe},
		{"emoji", "попей воды 💧", CheckCringe},
		{"exclamations", "попей воды!!", CheckCringe},
		{"fake concern", "я беспокоюсь: воды не было четыре часа.", CheckCringe},
		{"apology", "извини, что отвлекаю — попей воды.", CheckCringe},
		{"emotional support", "я рядом, ты не один. попей воды.", CheckCringe},
		{"asks how he feels", "как ты себя чувствуешь? попей воды.", CheckCringe},
		{"praise", "молодец! теперь попей воды.", CheckCringe},
		{"off topic", "пора бы уже что-то сделать.", CheckOnTopic},
		// The two recorded persona breaks from the phrasing eval run. Pinned as
		// unit tests because an eval run is sampled and may not reproduce them.
		{"formal plural", "Приходите… Жду вас", CheckAddress},
		{"third person about him", "Он не ел 11 дней", CheckAddress},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			var failed []string
			for _, r := range RunChecks(water, tc.body, "neutral") {
				if !r.Pass {
					failed = append(failed, r.Name+"("+r.Detail+")")
				}
			}
			joined := strings.Join(failed, " ")
			switch {
			case tc.want == "" && len(failed) > 0:
				t.Errorf("clean message flagged: %s", joined)
			case tc.want != "" && !strings.Contains(joined, tc.want+"("):
				t.Errorf("want %s to fail, got %q", tc.want, joined)
			}
		})
	}
}

// TestAddressCheck — the address check on its own, so the messages that must NOT
// trip it can be written without also having to satisfy the on-topic check.
func TestAddressCheck(t *testing.T) {
	bad := []string{
		"Приходите… Жду вас",        // the recorded formal-plural break
		"Он не ел 11 дней",          // the recorded third-person break
		"Выпейте воды, пожалуйста.", // plural imperative on its own
		"Ваш обед был давно.",       // formal possessive
	}
	for _, body := range bad {
		if r := checkAddress(body); r.Pass {
			t.Errorf("persona break not caught: %q", body)
		} else {
			t.Logf("%q -> %s", body, r.Detail)
		}
	}

	good := []string{
		"ты не пил воду четыре часа — попей.",   // correct informal address
		"сервис netdata упал, он не отвечает.",  // legitimately about a third party
		"я заметила, что зарядка была утром.",   // no address at all
		"в интернете опять тихо, всё работает.", // "интернете" is a noun, not an imperative
	}
	for _, body := range good {
		if r := checkAddress(body); !r.Pass {
			t.Errorf("clean message flagged: %q -> %s", body, r.Detail)
		}
	}
}

func TestMoodCheckUsesTheEnum(t *testing.T) {
	if r := checkMood("cheerful"); r.Pass {
		t.Error("mood outside the enum passed")
	}
	if r := checkMood(""); r.Pass {
		t.Error("empty mood passed")
	}
	for m := range Moods {
		if r := checkMood(m); !r.Pass {
			t.Errorf("enum mood %q failed", m)
		}
	}
}

// TestCandidateCarriesTheContext — the whole harness is worthless if the
// Candidate it builds does not carry the duration the prompt is supposed to
// name.
func TestCandidateCarriesTheContext(t *testing.T) {
	f, err := Load()
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	now, _ := f.Now()
	for _, c := range f.Cases {
		cand := c.Candidate(now)
		if cand.Rule.Name != c.Rule || cand.Severity != loop.Severity(c.Severity) {
			t.Errorf("%s: candidate lost rule or severity", c.ID)
		}
		if c.SinceMinutes > 0 {
			d, ok := cand.State.Since(c.Rule)
			if !ok || int(d.Minutes()) != c.SinceMinutes {
				t.Errorf("%s: since %v ok=%v, want %d minutes", c.ID, d, ok, c.SinceMinutes)
			}
		}
		if c.FactKey != "" {
			fact, ok := cand.State.Fact(c.Rule)
			if !ok || fact.Key != c.FactKey {
				t.Errorf("%s: fact key %q, want %q", c.ID, fact.Key, c.FactKey)
			}
		}
	}
}