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package acp_test

import (
	"strings"
	"testing"
	"time"

	"github.com/gdamore/tcell/v2"

	"codeberg.org/turbo-editors/turbo-core/acp"
	"codeberg.org/turbo-editors/turbo-core/theme"
	"codeberg.org/turbo-editors/turbo-core/ui"
)

// newView returns a view over a session whose agent never answers, sized to a
// screen.
//
// The agent is a pipe nobody reads, so the conversation is whatever the test
// puts into it and nothing arrives to race the drawing. The project has been
// bitten before by tests that asserted on a screen while a live process wrote
// to it, and that hid a real fault for a whole session.
func newView(t *testing.T, width, height int) (*acp.View, *fakeAgent) {
	t.Helper()

	agent, stream := newFakeAgent(t)
	session := acp.NewSession(stream, acp.Agent{Name: "Bob"}, t.TempDir(), acp.Options{})
	t.Cleanup(func() { _ = session.Close() })

	view := acp.NewView(session)
	view.SetBounds(ui.Rect{X: 0, Y: 0, W: width, H: height})
	return view, agent
}

// draw paints a view onto a simulation screen and returns the rows.
func draw(t *testing.T, view *acp.View, width, height int) []string {
	t.Helper()

	screen := tcell.NewSimulationScreen("UTF-8")
	if err := screen.Init(); err != nil {
		t.Fatalf("starting the screen: %v", err)
	}
	defer screen.Fini()
	screen.SetSize(width, height)

	th, err := theme.Load(theme.DefaultName, "")
	if err != nil {
		t.Fatalf("loading the theme: %v", err)
	}

	view.Draw(ui.NewPainter(screen), th)
	screen.Show()

	cells, w, h := screen.GetContents()
	rows := make([]string, h)
	for y := range h {
		var row strings.Builder
		for x := range w {
			row.WriteString(string(cells[y*w+x].Runes))
		}
		rows[y] = strings.TrimRight(row.String(), " ")
	}
	return rows
}

func TestTheWindowDrawsTheConversationAboveTheBoxYouTypeIn(t *testing.T) {
	view, _ := newView(t, 60, 12)
	view.SetInput("what I am typing")

	rows := draw(t, view, 60, 12)
	joined := strings.Join(rows, "\n")

	if !strings.Contains(joined, "what I am typing") {
		t.Errorf("the input is not on the screen:\n%s", joined)
	}
	if !strings.Contains(joined, "starting") {
		t.Errorf("the rule does not say the agent is starting:\n%s", joined)
	}

	// The input must be *below* the rule, which is what makes the two panes
	// two panes rather than one list.
	ruleAt, inputAt := -1, -1
	for i, row := range rows {
		if strings.Contains(row, "─") && ruleAt < 0 {
			ruleAt = i
		}
		if strings.Contains(row, "what I am typing") {
			inputAt = i
		}
	}
	if ruleAt < 0 || inputAt < 0 || inputAt <= ruleAt {
		t.Errorf("the rule is at %d and the input at %d:\n%s", ruleAt, inputAt, joined)
	}
}

func TestTypingGoesIntoTheBoxAndEnterSendsIt(t *testing.T) {
	view, _ := newView(t, 60, 12)

	for _, r := range "hello" {
		view.HandleKey(tcell.NewEventKey(tcell.KeyRune, r, tcell.ModNone))
	}
	if got := view.Input(); got != "hello" {
		t.Fatalf("Input() = %q", got)
	}

	view.HandleKey(tcell.NewEventKey(tcell.KeyEnter, 0, tcell.ModNone))

	if got := view.Input(); got != "" {
		t.Errorf("the box still holds %q after Enter", got)
	}
	if got := textOf(view.Session().Entries(), acp.EntryUser); got != "hello" {
		t.Errorf("the conversation says %q", got)
	}
}

func TestAltEnterMakesANewLineInsteadOfSending(t *testing.T) {
	view, _ := newView(t, 60, 12)

	for _, r := range "one" {
		view.HandleKey(tcell.NewEventKey(tcell.KeyRune, r, tcell.ModNone))
	}
	view.HandleKey(tcell.NewEventKey(tcell.KeyEnter, 0, tcell.ModAlt))
	for _, r := range "two" {
		view.HandleKey(tcell.NewEventKey(tcell.KeyRune, r, tcell.ModNone))
	}

	if got := view.Input(); got != "one\ntwo" {
		t.Errorf("Input() = %q, want two lines", got)
	}
	if len(view.Session().Entries()) != 0 {
		t.Error("Alt-Enter sent the prompt")
	}
}

func TestEnterOnAnEmptyBoxSendsNothing(t *testing.T) {
	// Enter on a blank line is somebody thinking, not a turn worth spending.
	view, _ := newView(t, 60, 12)

	view.HandleKey(tcell.NewEventKey(tcell.KeyRune, ' ', tcell.ModNone))
	view.HandleKey(tcell.NewEventKey(tcell.KeyEnter, 0, tcell.ModNone))

	if len(view.Session().Entries()) != 0 {
		t.Errorf("a blank prompt was sent: %v", view.Session().Entries())
	}
}

func TestBackspaceJoinsLinesAtTheStartOfOne(t *testing.T) {
	view, _ := newView(t, 60, 12)
	view.SetInput("one\ntwo")

	// The cursor sits at the end of "two"; three backspaces empty the line and
	// a fourth joins it to the one above.
	for range 4 {
		view.HandleKey(tcell.NewEventKey(tcell.KeyBackspace2, 0, tcell.ModNone))
	}
	if got := view.Input(); got != "one" {
		t.Errorf("Input() = %q, want the lines joined", got)
	}
}

func TestTabMovesBetweenTheTwoPanes(t *testing.T) {
	view, _ := newView(t, 60, 12)
	view.SetFocused(true)

	// With the input focused, a letter is typed. After Tab it scrolls instead.
	view.HandleKey(tcell.NewEventKey(tcell.KeyRune, 'a', tcell.ModNone))
	if got := view.Input(); got != "a" {
		t.Fatalf("Input() = %q before Tab", got)
	}

	view.HandleKey(tcell.NewEventKey(tcell.KeyTab, 0, tcell.ModNone))
	view.HandleKey(tcell.NewEventKey(tcell.KeyRune, 'b', tcell.ModNone))

	if got := view.Input(); got != "a" {
		t.Errorf("Input() = %q; typing reached the box although the conversation has the focus", got)
	}
}

func TestEscapeIsLeftAloneWhenThereIsNoTurnToStop(t *testing.T) {
	// Escape is how the rest of the editor closes things. A window that ate it
	// would be one you could not get out of by habit.
	view, _ := newView(t, 60, 12)

	if view.HandleKey(tcell.NewEventKey(tcell.KeyEscape, 0, tcell.ModNone)) {
		t.Error("Escape was swallowed with nothing running")
	}
}

func TestScrollingStopsFollowingAndEndTakesItUpAgain(t *testing.T) {
	// Reading back through what happened must not be interrupted by the agent
	// still writing.
	view, _ := newView(t, 60, 8)
	view.HandleKey(tcell.NewEventKey(tcell.KeyTab, 0, tcell.ModNone)) // focus the conversation

	for range 30 {
		view.Session().Prompt("a line of conversation")
	}
	draw(t, view, 60, 8) // lay it out, which is when the total is known

	if !view.Following() {
		t.Fatal("a fresh window is not following the end")
	}

	view.HandleKey(tcell.NewEventKey(tcell.KeyPgUp, 0, tcell.ModNone))
	if view.Following() {
		t.Error("scrolling up left the window pinned to the end")
	}

	view.HandleKey(tcell.NewEventKey(tcell.KeyEnd, 0, tcell.ModNone))
	if !view.Following() {
		t.Error("End did not take up following again")
	}
}

func TestTheTitleSaysWhatTheAgentIsDoing(t *testing.T) {
	view, _ := newView(t, 60, 12)

	if got := view.Title(); !strings.Contains(got, "starting") {
		t.Errorf("Title() = %q before the handshake", got)
	}
	if !strings.Contains(view.Title(), "Bob") {
		t.Errorf("Title() = %q, want the agent's name in it", view.Title())
	}
}

func TestAWindowTooSmallToDrawDrawsNothingRatherThanPanicking(t *testing.T) {
	// A terminal can be dragged to any size, and the layout subtracts four
	// rows for the box and the rule.
	for _, size := range []struct{ w, h int }{{0, 0}, {1, 1}, {3, 2}, {10, 4}} {
		view, _ := newView(t, size.w, size.h)
		view.SetInput("something")
		draw(t, view, max(size.w, 1), max(size.h, 1))
	}
}

func TestTheSpinnerTurnsWithTheClock(t *testing.T) {
	// A function of the clock rather than of a counter: nothing has to be
	// reset when a turn starts, two windows thinking at once turn in step, and
	// a test can assert on a frame without waiting for one.
	start := time.Unix(0, 0)

	first := acp.Spinner(start)
	if got := acp.Spinner(start.Add(acp.SpinnerPeriod / 3)); got != first {
		t.Errorf("the frame changed within one period: %c then %c", first, got)
	}
	if got := acp.Spinner(start.Add(acp.SpinnerPeriod)); got == first {
		t.Errorf("the frame did not change after a whole period: %c", got)
	}

	// It comes back round rather than running off the end of the frames.
	seen := map[rune]bool{}
	for i := range 40 {
		seen[acp.Spinner(start.Add(time.Duration(i)*acp.SpinnerPeriod))] = true
	}
	if len(seen) < 8 {
		t.Errorf("only %d distinct frames in forty periods", len(seen))
	}
}

func TestTheRuleShowsTheSpinnerWhileTheAgentThinks(t *testing.T) {
	view, agent := newView(t, 70, 12)
	agent.handshake()
	waitFor(t, "ready", view.Session().Ready)

	at := time.Unix(0, 0)
	view.SetClock(func() time.Time { return at })

	view.Session().Prompt("something")
	agent.read()
	waitFor(t, "the turn to start", view.Session().Running)

	rows := draw(t, view, 70, 12)
	joined := strings.Join(rows, "\n")
	if !strings.ContainsRune(joined, acp.Spinner(at)) {
		t.Errorf("the rule shows no spinner while thinking:\n%s", joined)
	}
	if !strings.Contains(joined, "thinking") {
		t.Errorf("the rule does not say what it is doing:\n%s", joined)
	}
}

func TestWithNothingSelectedCopyTakesTheBlockUnderTheCursor(t *testing.T) {
	// The thing somebody wants is almost always a code block, and selecting it
	// by hand first is work the editor can do for them.
	view, _ := newView(t, 70, 20)
	view.Session().Prompt("show me")

	transcript := view.Session()
	_ = transcript
	feed(t, view, "Here you are:\n```go\npackage main\n\nfunc main() {}\n```\nand that is all.")

	draw(t, view, 70, 20) // lay it out, which is when the regions exist
	lines := linesOfView(t, view, 70, 20)

	at := indexOfLine(lines, "package main")
	if at < 0 {
		t.Fatalf("the code never appeared:\n%s", strings.Join(lines, "\n"))
	}
	view.SetCaretForTest(at)

	text, ok := view.Copy()
	if !ok {
		t.Fatal("Copy() found nothing to copy")
	}
	if !strings.Contains(text, "package main") || !strings.Contains(text, "func main() {}") {
		t.Errorf("Copy() = %q, want the whole code block", text)
	}
	if strings.Contains(text, "Here you are") || strings.Contains(text, "that is all") {
		t.Errorf("Copy() = %q, want the block alone rather than the prose around it", text)
	}
	if strings.HasPrefix(text, " ") {
		t.Errorf("Copy() = %q, want the drawing indent taken off", text)
	}
}

func TestShiftArrowsSelectLinesAndCtrlCCopiesThem(t *testing.T) {
	view, _ := newView(t, 70, 20)
	view.SetFocused(true)
	feed(t, view, "one\ntwo\nthree")
	draw(t, view, 70, 20)

	view.HandleKey(tcell.NewEventKey(tcell.KeyTab, 0, tcell.ModNone)) // the conversation
	view.SetCaretForTest(indexOfLine(linesOfView(t, view, 70, 20), "one"))

	view.HandleKey(tcell.NewEventKey(tcell.KeyDown, 0, tcell.ModShift))
	from, to, ok := view.Selection()
	if !ok || to-from != 1 {
		t.Fatalf("Selection() = %d..%d ok=%v, want two lines", from, to, ok)
	}

	var copied string
	view.OnCopy = func(text string) { copied = text }
	view.HandleKey(tcell.NewEventKey(tcell.KeyCtrlC, 0, tcell.ModNone))

	if !strings.Contains(copied, "one") || !strings.Contains(copied, "two") {
		t.Errorf("copied %q, want both selected lines", copied)
	}
	if strings.Contains(copied, "three") {
		t.Errorf("copied %q, want only what was selected", copied)
	}
	if _, _, still := view.Selection(); still {
		t.Error("the selection survived being copied")
	}
}

func TestEscapeDropsTheSelectionBeforeItStopsATurn(t *testing.T) {
	// Two meanings on one key, ordered by how local they are.
	view, _ := newView(t, 70, 20)
	view.SetFocused(true)
	feed(t, view, "one\ntwo")
	draw(t, view, 70, 20)

	view.HandleKey(tcell.NewEventKey(tcell.KeyTab, 0, tcell.ModNone))
	view.HandleKey(tcell.NewEventKey(tcell.KeyDown, 0, tcell.ModShift))
	if _, _, ok := view.Selection(); !ok {
		t.Fatal("nothing was selected to begin with")
	}

	if !view.HandleKey(tcell.NewEventKey(tcell.KeyEscape, 0, tcell.ModNone)) {
		t.Error("Escape was not claimed although there was a selection")
	}
	if _, _, ok := view.Selection(); ok {
		t.Error("Escape left the selection in place")
	}

	// With neither a selection nor a turn, Escape belongs to the editor again.
	if view.HandleKey(tcell.NewEventKey(tcell.KeyEscape, 0, tcell.ModNone)) {
		t.Error("Escape was swallowed with nothing to do")
	}
}

func TestASelectedLineIsDrawnInTheSelectionColour(t *testing.T) {
	view, _ := newView(t, 70, 20)
	view.SetFocused(true)
	feed(t, view, "one\ntwo")
	draw(t, view, 70, 20)

	view.HandleKey(tcell.NewEventKey(tcell.KeyTab, 0, tcell.ModNone))
	view.SetCaretForTest(indexOfLine(linesOfView(t, view, 70, 20), "one"))
	view.HandleKey(tcell.NewEventKey(tcell.KeyDown, 0, tcell.ModShift))

	th, err := theme.Load(theme.DefaultName, "")
	if err != nil {
		t.Fatalf("loading the theme: %v", err)
	}
	wantFg, wantBg, _ := th.Style(theme.KeyEditorSelection).Decompose()

	screen := tcell.NewSimulationScreen("UTF-8")
	if err := screen.Init(); err != nil {
		t.Fatalf("starting the screen: %v", err)
	}
	defer screen.Fini()
	screen.SetSize(70, 20)
	view.Draw(ui.NewPainter(screen), th)
	screen.Show()

	cells, w, _ := screen.GetContents()
	found := false
	for y := range 20 {
		for x := range w {
			cell := cells[y*w+x]
			if string(cell.Runes) != "o" {
				continue
			}
			fg, bg, _ := cell.Style.Decompose()
			if fg == wantFg && bg == wantBg {
				found = true
			}
		}
	}
	if !found {
		t.Error("no cell of the selected line is drawn in the selection colour")
	}
}

// feed puts an agent message into a view's conversation without a live agent.
func feed(t *testing.T, view *acp.View, text string) {
	t.Helper()
	view.Session().AddAgentTextForTest(text)
}

// linesOfView returns the conversation as it was last laid out.
func linesOfView(t *testing.T, view *acp.View, width, height int) []string {
	t.Helper()

	var out []string
	for _, line := range view.LinesForTest() {
		out = append(out, line.Text)
	}
	return out
}

// indexOfLine returns where a line whose text contains want sits, or -1.
func indexOfLine(lines []string, want string) int {
	for i, line := range lines {
		if strings.Contains(line, want) {
			return i
		}
	}
	return -1
}

func TestCopyingABlockLeavesTheSpeakersLabelBehind(t *testing.T) {
	// "‣ Bob (llama.cpp)" above a code block is furniture. Pasting it into a
	// source file is never what anybody meant, and it was in the first version
	// of this — found by copying from the real binary and reading the OSC 52
	// payload back off the wire.
	view, _ := newView(t, 70, 20)
	feed(t, view, "```go\nfunc Reverse(s string) string {\n\treturn s\n}\n```")
	draw(t, view, 70, 20)

	lines := linesOfView(t, view, 70, 20)
	at := indexOfLine(lines, "func Reverse")
	if at < 0 {
		t.Fatalf("the code never appeared:\n%s", strings.Join(lines, "\n"))
	}
	view.SetCaretForTest(at)

	text, ok := view.Copy()
	if !ok {
		t.Fatal("Copy() found nothing")
	}
	if strings.Contains(text, "‣") {
		t.Errorf("Copy() = %q, want no speaker label in it", text)
	}
	if !strings.HasPrefix(text, "func Reverse") {
		t.Errorf("Copy() = %q, want it to start at the code", text)
	}
}

func TestCopyingAToolsOutputLeavesItsHeadingBehind(t *testing.T) {
	view, agent := newView(t, 70, 20)
	id := agent.handshake()
	waitFor(t, "ready", view.Session().Ready)

	agent.update(id, `{"sessionUpdate":"tool_call","toolCallId":"c1","title":"Shell","status":"completed","rawInput":{"cmd":"ls"},"content":[{"type":"content","content":{"type":"text","text":"one.go\ntwo.go"}}]}`)
	waitFor(t, "the tool output", func() bool {
		return strings.Contains(strings.Join(linesOfView(t, view, 70, 20), "\n"), "one.go")
	})
	draw(t, view, 70, 20)

	view.SetCaretForTest(indexOfLine(linesOfView(t, view, 70, 20), "one.go"))
	text, ok := view.Copy()
	if !ok {
		t.Fatal("Copy() found nothing")
	}
	if strings.Contains(text, "Shell") || strings.Contains(text, "✓") {
		t.Errorf("Copy() = %q, want the output without the heading", text)
	}
	if !strings.Contains(text, "one.go") || !strings.Contains(text, "two.go") {
		t.Errorf("Copy() = %q, want the whole output", text)
	}
}