package handlers

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	bloomtypes "github.com/oy/openyield/x/bloom/types"
)

func TestBloomSeededRecordRendersTargetRate(t *testing.T) {
	srv := newTestServer(t)
	mux := http.NewServeMux()
	srv.Register(mux)
	rec := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/bloom/stash-holder-alia", nil)
	mux.ServeHTTP(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("GET /bloom/stash-holder-alia: status %d, want 200", rec.Code)
	}
	body := rec.Body.String()
	// Accrued Grain present.
	if !strings.Contains(body, "Grain") {
		t.Errorf("body missing 'Grain'")
	}
	// Target rate 4.5% (from TargetBloomRateBasisPoints=450).
	want := formatFloat(float64(bloomtypes.TargetBloomRateBasisPoints) / 100)
	if !strings.Contains(body, want) {
		t.Errorf("body missing target rate %s%% (TargetBloomRateBasisPoints=%d)", want, bloomtypes.TargetBloomRateBasisPoints)
	}
	// Mission Lock note present.
	if !strings.Contains(body, "real production") {
		t.Errorf("body missing Mission Lock note about real production")
	}
	assertNoBannedTerms(t, body)
}

func TestBloomMissingReturns404(t *testing.T) {
	srv := newTestServer(t)
	mux := http.NewServeMux()
	srv.Register(mux)
	rec := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/bloom/stash-nobody", nil)
	mux.ServeHTTP(rec, req)
	if rec.Code != http.StatusNotFound {
		t.Fatalf("GET /bloom/stash-nobody: status %d, want 404", rec.Code)
	}
	// G-026: rendered-HTML lexicon check on the ERROR response body too.
	assertNoBannedTerms(t, rec.Body.String())
}

// TestBloomTargetRateFromCodeConstant (D-073 regression guard): asserts the
// handler reads x/bloom/types.TargetBloomRateBasisPoints=450 (NOT a hardcoded
// 450 or a docs value). This test would FAIL if the handler hardcoded the rate
// instead of reading the code constant.
func TestBloomTargetRateFromCodeConstant(t *testing.T) {
	// D-073: the code constant is the source of truth.
	if bloomtypes.TargetBloomRateBasisPoints != 450 {
		t.Fatalf("D-073: TargetBloomRateBasisPoints = %d, want 450 (code constant)", bloomtypes.TargetBloomRateBasisPoints)
	}
	if bloomtypes.MinBloomRateBasisPoints != 400 {
		t.Fatalf("D-073: MinBloomRateBasisPoints = %d, want 400 (code constant)", bloomtypes.MinBloomRateBasisPoints)
	}
	if bloomtypes.MaxBloomRateBasisPoints != 500 {
		t.Fatalf("D-073: MaxBloomRateBasisPoints = %d, want 500 (code constant)", bloomtypes.MaxBloomRateBasisPoints)
	}

	srv := newTestServer(t)
	mux := http.NewServeMux()
	srv.Register(mux)
	rec := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/bloom/stash-holder-alia", nil)
	mux.ServeHTTP(rec, req)
	body := rec.Body.String()

	// The rendered target rate must be the code constant / 100 = 4.5.
	wantTarget := formatFloat(float64(bloomtypes.TargetBloomRateBasisPoints) / 100)
	if !strings.Contains(body, wantTarget) {
		t.Errorf("D-073: body missing target rate %s%% (from code constant %d)", wantTarget, bloomtypes.TargetBloomRateBasisPoints)
	}
	// The seeded record for holder-alia uses RateBasisPoints=450 (the target).
	rec2, ok := srv.Store.GetBloomRecord("stash-holder-alia")
	if !ok {
		t.Fatal("seeded bloom record stash-holder-alia missing")
	}
	if rec2.RateBasisPoints != bloomtypes.TargetBloomRateBasisPoints {
		t.Errorf("D-073: seeded record RateBasisPoints = %d, want %d (code constant)", rec2.RateBasisPoints, bloomtypes.TargetBloomRateBasisPoints)
	}
	// The rate band must be rendered from the code constants.
	wantMin := formatFloat(float64(bloomtypes.MinBloomRateBasisPoints) / 100)
	wantMax := formatFloat(float64(bloomtypes.MaxBloomRateBasisPoints) / 100)
	if !strings.Contains(body, wantMin) {
		t.Errorf("D-073: body missing min rate %s%% (from code constant)", wantMin)
	}
	if !strings.Contains(body, wantMax) {
		t.Errorf("D-073: body missing max rate %s%% (from code constant)", wantMax)
	}
}

// Compile-time assertion that the handler uses the real x/bloom/types struct.
var _ bloomtypes.BloomRecord

// formatFloat formats a float to 1 decimal place without importing strconv
// (keeps the test deps minimal; matches the template's printf "%.1f").
func formatFloat(f float64) string {
	// Round to 1 decimal.
	rounded := float64(int(f*10+0.5)) / 10
	whole := int(rounded)
	frac := int((rounded - float64(whole)) * 10)
	if frac == 0 {
		return formatInt2(int64(whole)) + ".0"
	}
	return formatInt2(int64(whole)) + "." + string(rune('0'+frac))
}

func formatInt2(n int64) string {
	if n == 0 {
		return "0"
	}
	neg := n < 0
	if neg {
		n = -n
	}
	var buf [20]byte
	i := len(buf)
	for n > 0 {
		i--
		buf[i] = byte('0' + n%10)
		n /= 10
	}
	if neg {
		i--
		buf[i] = '-'
	}
	return string(buf[i:])
}