package app

import (
	"strings"
	"testing"

	"github.com/correx/tui-go/internal/protocol"
	"github.com/correx/tui-go/internal/ws"
)

func clarModel() Model {
	m := NewModel(ws.New("", 0)) // unconnected; Send just buffers
	m.width, m.height = 120, 40
	m.theme = NewTheme(SoftBlue)
	m.selectedID = "s1"
	m.sessionEntered = true
	m.applyServer(protocol.ServerMessage{
		Type:      protocol.TypeClarification,
		SessionID: "s1",
		RequestID: "req-1",
		StageID:   "analyst",
		Questions: []protocol.ClarificationQuestionDto{
			{ID: "stack", Prompt: "Which stack?", Options: []string{"React", "Vue"}, Header: "Stack"},
		},
	})
	return m
}

func TestClarificationEntersStateAndRenders(t *testing.T) {
	m := clarModel()
	if m.displayState() != StateClarification {
		t.Fatalf("want StateClarification, got %v", m.displayState())
	}
	out := m.clarificationModal()
	for _, want := range []string{"clarifying questions", "Which stack?", "React", "Vue", "Stack", "custom"} {
		if !strings.Contains(out, want) {
			t.Fatalf("modal missing %q:\n%s", want, out)
		}
	}
}

func TestClarificationLongPromptSoftWraps(t *testing.T) {
	m := clarModel()
	m.width, m.height = 60, 40 // narrow modal so a long prompt must wrap
	longPrompt := "Which API surface should the web UI talk to for streaming session " +
		"events and how should it authenticate against the server endpoints?"
	m.applyServer(protocol.ServerMessage{
		Type:      protocol.TypeClarification,
		SessionID: "s1",
		RequestID: "req-2",
		StageID:   "analyst",
		Questions: []protocol.ClarificationQuestionDto{
			{ID: "api", Prompt: longPrompt, Options: []string{"REST", "WebSocket"}, Header: "API"},
		},
	})
	out := m.clarificationModal()
	// Every word of the prompt must survive — nothing clipped at the modal edge.
	for _, word := range strings.Fields(longPrompt) {
		if !strings.Contains(out, word) {
			t.Fatalf("wrapped prompt dropped %q:\n%s", word, out)
		}
	}
	// And it must actually span multiple rendered rows (i.e. it wrapped, not overflowed).
	if len(strings.Split(strings.TrimRight(out, "\n"), "\n")) < 4 {
		t.Fatalf("expected the long prompt to wrap across rows:\n%s", out)
	}
}

func TestWrapPromptFirstLineNarrowerThanContinuation(t *testing.T) {
	lines := wrapPrompt("one two three four five six", 7, 20)
	if lines[0] != "one two" {
		t.Fatalf("first line should honor firstW=7, got %q", lines[0])
	}
	if len(lines) < 2 {
		t.Fatalf("expected continuation lines, got %v", lines)
	}
}

func TestClarificationSelectAndSubmit(t *testing.T) {
	m := clarModel()
	// move the option cursor to "Vue" (index 1) and select it
	m = applyClarKey(m, keyMsg{Type: keyRight})
	m = applyClarKey(m, keyMsg{Type: keySpace})
	if !m.clarChosenAt(0, 1) {
		t.Fatalf("expected option 1 chosen, chosen=%v", m.clarChosen)
	}
	// submit
	m = applyClarKey(m, keyMsg{Type: keyEnter})
	if s := m.session("s1"); s == nil || s.Clar != nil {
		t.Fatalf("expected clarification cleared after submit")
	}
	if m.displayState() != StateInSession {
		t.Fatalf("want StateInSession after submit, got %v", m.displayState())
	}
}

func TestClarificationSubmitGuardWaitsForAllAnswers(t *testing.T) {
	m := clarModel()
	m.applyServer(protocol.ServerMessage{
		Type: protocol.TypeClarification, SessionID: "s1", RequestID: "req-2", StageID: "analyst",
		Questions: []protocol.ClarificationQuestionDto{
			{ID: "a", Prompt: "Q A?", Options: []string{"x"}},
			{ID: "b", Prompt: "Q B?", Options: []string{"y"}},
		},
	})
	// answer only the first question, then attempt submit
	m = applyClarKey(m, keyMsg{Type: keySpace})
	m = applyClarKey(m, keyMsg{Type: keyEnter})
	if s := m.session("s1"); s == nil || s.Clar == nil {
		t.Fatalf("expected clarification to remain with partial answers")
	}
	if m.clarFocus != 1 {
		t.Fatalf("expected focus nudged to first unanswered (1), got %d", m.clarFocus)
	}
}

func TestClarificationCustomTextAnswer(t *testing.T) {
	m := clarModel()
	m = applyClarKey(m, keyMsg{Type: keyRunes, Runes: []rune("e")})
	if !m.clarTyping {
		t.Fatalf("expected typing mode after 'e'")
	}
	for _, r := range "Solid" {
		m = applyClarKey(m, keyMsg{Type: keyRunes, Runes: []rune{r}})
	}
	m = applyClarKey(m, keyMsg{Type: keyEnter})
	if m.clarTyping {
		t.Fatalf("expected typing committed")
	}
	if m.clarTextAt(0) != "Solid" {
		t.Fatalf("want custom text 'Solid', got %q", m.clarTextAt(0))
	}
	if !m.clarAnswered(0, m.session("s1").Clar.Questions[0]) {
		t.Fatalf("expected question answered via custom text")
	}
}

func applyClarKey(m Model, k keyMsg) Model {
	updated, _ := m.handleClarificationKey(k)
	return updated.(Model)
}
