package main

import (
	"bytes"
	"fmt"
	"strings"
	"testing"

	"textmachine/backend/internal/pipeline"
)

// bankcompleteness_render_test.go: the SCREEN half of backlog row 253(б) and row 357(а). The bank's
// completeness and the rows the paid role was never asked about reach the surface an owner reads FIRST —
// stdout — and not only the machine sidecar and the full text table beside the database.

// TestTheSigningScreenSaysHowCompleteTheBankIs pins all four states of one conditional line. Three of them
// are the states the engine can be in; the fourth is the false alarm the naive version raises.
//
// ⛔ EACH CASE ASSERTS A SENTENCE AND FORBIDS THE OTHER TWO. A pin that only checks the alarm appears is
// green on a screen that shows it always, and a pin that only checks silence is green on a screen that
// says nothing at all — this project has bought both mistakes.
func TestTheSigningScreenSaysHowCompleteTheBankIs(t *testing.T) {
	const (
		whole      = "Bank completeness: WHOLE"
		partial    = "Bank completeness: PARTIAL"
		unmeasured = "Bank completeness: NOT MEASURED"
		types      = "Term TYPES are unrefined"
	)
	for _, tc := range []struct {
		name       string
		c          *pipeline.BankConsolidation
		want       []string
		mustNotSay []string
	}{{
		name:       "the pass never ran",
		c:          nil,
		want:       []string{unmeasured, "did not run"},
		mustNotSay: []string{whole, partial, types},
	}, {
		name: "every render batch was bought",
		// Three DIFFERENT numbers, and all three asserted: equal ones would let the line print any of
		// them in any slot and still pass, which is the same degeneracy the money fixtures guard against.
		c:          &pipeline.BankConsolidation{Complete: true, Consolidated: 41, Declined: 2, Unanswered: 3},
		want:       []string{whole, "41 consolidated", "2 declined", "3 unanswered"},
		mustNotSay: []string{partial, unmeasured, types},
	}, {
		name: "the paid role was asked for nothing — because the BANK renders them",
		// Reachable state, not a hypothetical: the already-banked filter can empty the paid set, and then
		// zero batches were planned. «Every render batch was bought» is true of zero batches and reads as a
		// report on work that happened — the instrument answering its own question (D39.202).
		c:          &pipeline.BankConsolidation{Complete: true, NeverAsked: 3},
		want:       []string{whole, "asked for nothing", "No batch was planned", "the bank already renders every candidate this run found"},
		mustNotSay: []string{partial, unmeasured, types, "every render batch was bought", "earlier purchase"},
	}, {
		// ⚠ MAINTENANCE DECLARED, not a quiet edit: the settled basis added a SECOND reason for «the role
		// was asked nothing», and the single sentence this pin used to require asserted the FIRST one for
		// both. For a book answered from the memory of decisions it was false in both halves — the bank
		// holds no seed surface for those terms and the drafts were never asked to agree with anything.
		name:       "the paid role was asked for nothing — because the BOOK had already decided them",
		c:          &pipeline.BankConsolidation{Complete: true, SettledEarlier: 4},
		want:       []string{whole, "asked for nothing", "already decided every candidate", "4 term(s)", "has not moved"},
		mustNotSay: []string{partial, unmeasured, types, "every render batch was bought", "the bank already renders"},
	}, {
		// And the state that makes the two reasons a CHOICE rather than an either/or: both savings fired,
		// and the line must name both with their own numbers. Three different counts, so a line printing
		// one number in the other's slot cannot pass.
		name:       "asked for nothing, and BOTH savings explain it",
		c:          &pipeline.BankConsolidation{Complete: true, NeverAsked: 3, SettledEarlier: 7},
		want:       []string{whole, "asked for nothing", "3 term(s)", "7 because", "this book decided them in an earlier purchase"},
		mustNotSay: []string{partial, unmeasured, types, "every render batch was bought"},
	}, {
		name: "a budget cut the render pass",
		c: &pipeline.BankConsolidation{
			Complete: false, RenderBatchesDropped: 5, Consolidated: 38, Unanswered: 47,
		},
		// The count of unbought batches AND the warning that `unanswered` is not the role's silence here:
		// on the live run of 04.09 those 47 read as terms the model skipped.
		// ⚠ THE BUDGET IS NAMED IN FULL, because `budget_usd` is a SUBSTRING of `classify_budget_usd`:
		// asserted loosely, this case stays green while the screen sends an operator to raise the budget
		// that did not cut his pass. The forbidden list says the other budget must not appear at all here.
		want:       []string{partial, "5 batch(es)", "47 unanswered", "38 consolidated", "gates.terminology.budget_usd"},
		mustNotSay: []string{whole, unmeasured, types, "classify_budget_usd"},
	}, {
		name: "only the classifier was cut",
		c: &pipeline.BankConsolidation{
			Complete: true, ClassifyBatchesDropped: 1, Consolidated: 29,
		},
		// The run of 08.09: the render pass was intact and the engine's own log still said «PARTIALLY
		// consolidated». The screen must not repeat that — the renderings are all there.
		want:       []string{whole, types, "gates.terminology.classify_budget_usd", "1 batch(es)"},
		mustNotSay: []string{partial, unmeasured},
	}} {
		t.Run(tc.name, func(t *testing.T) {
			var b bytes.Buffer
			renderBankConsolidation(&b, tc.c)
			out := b.String()
			for _, want := range tc.want {
				if !strings.Contains(out, want) {
					t.Errorf("the screen must say %q:\n%s", want, out)
				}
			}
			for _, never := range tc.mustNotSay {
				if strings.Contains(out, never) {
					t.Errorf("the screen must NOT say %q here:\n%s", never, out)
				}
			}
		})
	}
}

// TestTheNeverAskedCountSurvivesTheStdoutCap is the trap this surface was built around, and the fixture is
// deliberately WIDER than the cap because a narrower one is green on a blind screen.
//
// A row the role was never asked about carries no rendering, so reviewRank sends it to 1000 — dead LAST —
// and the stdout table shows twenty rows. On any book with twenty candidates every such row is below the
// fold, so a per-row mark alone would tell the owner nothing at the moment he decides. The count sits
// above the table, outside the cap.
//
// The test asserts BOTH halves, and the second is what makes the first mean something: the marked row
// really is cut from the table here.
//
// Mutation this catches: move the summary inside renderBankStopRows (or drop the NeverAsked clause) and
// the count disappears from a screen whose table cannot show the rows it counts → RED.
func TestTheNeverAskedCountSurvivesTheStdoutCap(t *testing.T) {
	var rows []pipeline.BankStopRow
	for i := 0; i < bankStopStdoutCap+5; i++ {
		// Every one of these has a rendering and a confidence, so all of them outrank the settled row below.
		rows = append(rows, pipeline.BankStopRow{
			Src: fmt.Sprintf("术%d", i), Dst: fmt.Sprintf("приём%d", i), Origin: "mined", Freq: 5, Conf: 10,
		})
	}
	rows = append(rows, pipeline.BankStopRow{Src: "方源", Origin: "banknote", Freq: 30, SettledByBank: true})

	var b bytes.Buffer
	renderSignatureStop(&b, &pipeline.WaveSignatureStop{
		Terms: len(rows), SignaturePath: "p", Rows: rows,
		Consolidation: &pipeline.BankConsolidation{Complete: true, Consolidated: 25, NeverAsked: 1},
	})
	out := b.String()
	if !strings.Contains(out, "1 term(s) were NOT ASKED about") {
		t.Errorf("the count of never-asked rows must reach the screen above the cap:\n%s", out)
	}
	// ABOVE the table, which the code claims in a comment and nothing else checked — an invariant living
	// only in prose is held by nothing. The owner meets the state of the bank before the rows, not after
	// scrolling past twenty of them.
	// ⚠ BOTH INDICES ARE CHECKED FOR PRESENCE FIRST. `strings.Index` returns -1 for an absent needle, and
	// -1 < N is true for every N — so the bare comparison passes loudest exactly when the line has vanished.
	iSummary, iTable := strings.Index(out, "Bank completeness"), strings.Index(out, "least-confident first")
	if iSummary < 0 || iTable < 0 {
		t.Fatalf("both the completeness line and the table must be on the screen (summary=%d table=%d):\n%s", iSummary, iTable, out)
	}
	if iSummary > iTable {
		t.Errorf("the completeness line must come BEFORE the table it qualifies:\n%s", out)
	}
	// F7: the SENTENCE, not only the number. A count with no explanation puts good news in the same shape
	// as a gap, which is what the whole marker exists to prevent.
	if !strings.Contains(out, "the bank already renders those surfaces and every draft agreed") {
		t.Errorf("the count must carry WHY those rows were skipped, not just how many:\n%s", out)
	}
	// The half that proves the fixture: the row itself is NOT on the screen, so the count is the only thing
	// carrying it. If this ever starts failing because the cap or the ranking moved, the assertion above
	// stopped being a test of the cap and has to be rewritten, not relaxed.
	if strings.Contains(out, "方源") {
		t.Fatalf("premise broken: the settled row is supposed to fall under the stdout cap in this fixture, "+
			"so a per-row mark alone would be invisible — rewrite the fixture, do not relax the assertion:\n%s", out)
	}
	// CONTROL: shown a settled row that FITS, the table does mark it — so the count above is a second
	// carrier for the capped case and not a replacement that left the row unexplained.
	var small bytes.Buffer
	renderSignatureStop(&small, &pipeline.WaveSignatureStop{
		Terms: 1, SignaturePath: "p",
		Rows:          []pipeline.BankStopRow{{Src: "方源", Origin: "banknote", Freq: 30, SettledByBank: true}},
		Consolidation: &pipeline.BankConsolidation{Complete: true, Consolidated: 1, NeverAsked: 1},
	})
	if !strings.Contains(small.String(), "NOT ASKED: the bank already renders this surface") {
		t.Errorf("a settled row that fits on the screen must say why it has no rendering:\n%s", small.String())
	}
	// ⛔ AND THE LINE DOES NOT LIVE AND DIE WITH THE TABLE. renderBankStopRows returns early on zero rows,
	// so a summary printed from inside it — or guarded by the rows being non-empty — disappears exactly
	// where the state still matters: a stop whose table this build could not fill still put a bank in front
	// of the owner. Without this case, «outside the cap» is asserted only by ordering.
	var noRows bytes.Buffer
	renderSignatureStop(&noRows, &pipeline.WaveSignatureStop{
		Terms: 0, SignaturePath: "p",
		Consolidation: &pipeline.BankConsolidation{RenderBatchesDropped: 2, Consolidated: 7, Unanswered: 9},
	})
	if !strings.Contains(noRows.String(), "Bank completeness: PARTIAL") {
		t.Errorf("the completeness line is not a part of the table and must survive an empty one:\n%s", noRows.String())
	}

	// And a row that was ASKED about prints no such line, or the marker means nothing.
	var quiet bytes.Buffer
	renderSignatureStop(&quiet, &pipeline.WaveSignatureStop{
		Terms: 1, SignaturePath: "p",
		Rows:          []pipeline.BankStopRow{{Src: "花家", Dst: "семья Хуа", Origin: "mined", Freq: 9, Conf: 50}},
		Consolidation: &pipeline.BankConsolidation{Complete: true, Consolidated: 1},
	})
	if strings.Contains(quiet.String(), "NOT ASKED") {
		t.Errorf("control: a row the role WAS asked about must carry no such mark:\n%s", quiet.String())
	}
}