package app

import (
	"testing"

	"github.com/hjbdev/patterm/internal/preset"
)

func newTestPalette() *paletteState {
	return newPalette(nil, "", preset.Set{})
}

func TestPaletteIgnoresKittyReleaseEvent(t *testing.T) {
	// A kitty key-release for Ctrl-K. With the legacy handler this looked
	// like ESC followed by `[`, which fell through to cancel.
	p := newTestPalette()
	chunk := []byte("\x1b[107;5:3u")
	action, done, adv := p.handleInput(chunk, 0)
	if done {
		t.Fatalf("release event closed palette: action=%+v", action)
	}
	if adv != len(chunk) {
		t.Fatalf("advance %d, want %d", adv, len(chunk))
	}
}

func TestPaletteEscViaKittyCancels(t *testing.T) {
	p := newTestPalette()
	chunk := []byte("\x1b[27u")
	action, done, adv := p.handleInput(chunk, 0)
	if !done || action.kind != "cancel" {
		t.Fatalf("Esc via CSI u didn't cancel: action=%+v done=%v", action, done)
	}
	if adv != len(chunk) {
		t.Fatalf("advance %d, want %d", adv, len(chunk))
	}
}

func TestPaletteBareEscCancels(t *testing.T) {
	p := newTestPalette()
	action, done, adv := p.handleInput([]byte{0x1b}, 0)
	if !done || action.kind != "cancel" {
		t.Fatalf("bare ESC didn't cancel: action=%+v done=%v", action, done)
	}
	if adv != 1 {
		t.Fatalf("advance %d, want 1", adv)
	}
}

func TestPaletteKittyArrowsNavigate(t *testing.T) {
	pr := []*preset.Preset{{Name: "a"}, {Name: "b"}, {Name: "c"}}
	p := newPalette(nil, "", preset.Set{Agents: pr})
	if p.cursor != 0 {
		t.Fatalf("initial cursor %d", p.cursor)
	}
	// Kitty functional Down arrow.
	_, _, adv := p.handleInput([]byte("\x1b[57353u"), 0)
	if adv != 8 {
		t.Fatalf("advance %d", adv)
	}
	if p.cursor != 1 {
		t.Fatalf("cursor %d after Down, want 1", p.cursor)
	}
	// Kitty functional Up arrow.
	_, _, _ = p.handleInput([]byte("\x1b[57352u"), 0)
	if p.cursor != 0 {
		t.Fatalf("cursor %d after Up, want 0", p.cursor)
	}
}

func TestPaletteLegacyArrowsStillWork(t *testing.T) {
	pr := []*preset.Preset{{Name: "a"}, {Name: "b"}}
	p := newPalette(nil, "", preset.Set{Agents: pr})
	_, _, adv := p.handleInput([]byte("\x1b[B"), 0)
	if adv != 3 {
		t.Fatalf("advance %d", adv)
	}
	if p.cursor != 1 {
		t.Fatalf("cursor %d, want 1", p.cursor)
	}
}

func TestPaletteKittyEnterAccepts(t *testing.T) {
	pr := []*preset.Preset{{Name: "x"}}
	p := newPalette(nil, "", preset.Set{Agents: pr})
	action, done, _ := p.handleInput([]byte("\x1b[13u"), 0)
	if !done || action.kind != "spawn-agent" {
		t.Fatalf("Enter via CSI u didn't accept: action=%+v done=%v", action, done)
	}
}

func TestPaletteKittyBackspace(t *testing.T) {
	p := newTestPalette()
	p.query = []rune("hello")
	_, _, _ = p.handleInput([]byte("\x1b[127u"), 0)
	if string(p.query) != "hell" {
		t.Fatalf("query %q after backspace", string(p.query))
	}
}

func TestPaletteLegacyPrintableTypes(t *testing.T) {
	p := newTestPalette()
	_, _, _ = p.handleInput([]byte("a"), 0)
	_, _, _ = p.handleInput([]byte("b"), 0)
	if string(p.query) != "ab" {
		t.Fatalf("query %q", string(p.query))
	}
}

// "Spawn process…" is intercepted on accept: it switches the palette
// into the form mode instead of closing it. Subsequent Enter on a
// non-empty command line emits the submit action with relaunch reflecting
// the checkbox state.
func TestPaletteSpawnProcessFormFlow(t *testing.T) {
	p := newPalette(nil, "", preset.Set{})
	// The "Spawn process…" entry is the only non-Quit item with an
	// empty preset list. Locate its index by scanning items.
	idx := -1
	for i, it := range p.items {
		if it.action.kind == "spawn-process-form" {
			idx = i
			break
		}
	}
	if idx < 0 {
		t.Fatalf("no spawn-process-form item in palette items: %+v", p.items)
	}
	p.cursor = idx

	// Enter on the entry opens the form (done=false, mode flips).
	action, done, _ := p.handleInput([]byte("\r"), 0)
	if done {
		t.Fatalf("spawn-process-form accept closed palette: action=%+v", action)
	}
	if p.mode != paletteModeSpawnForm || p.form == nil {
		t.Fatalf("palette did not switch to form mode: mode=%v form=%v", p.mode, p.form)
	}

	// Type a command: "bun run dev".
	for _, b := range []byte("bun run dev") {
		_, _, _ = p.handleInput([]byte{b}, 0)
	}
	if string(p.form.cmd) != "bun run dev" {
		t.Fatalf("form cmd = %q", string(p.form.cmd))
	}

	// Tab to the relaunch field, toggle with space.
	_, _, _ = p.handleInput([]byte{'\t'}, 0)
	if p.form.field != 1 {
		t.Fatalf("field after tab = %d, want 1", p.form.field)
	}
	_, _, _ = p.handleInput([]byte{' '}, 0)
	if !p.form.relaunch {
		t.Fatalf("relaunch toggle didn't stick")
	}

	// Enter submits.
	action, done, _ = p.handleInput([]byte("\r"), 0)
	if !done || action.kind != "spawn-process-submit" {
		t.Fatalf("submit didn't fire: action=%+v done=%v", action, done)
	}
	if action.command != "bun run dev" || !action.relaunch {
		t.Fatalf("submit payload = %+v", action)
	}
}

func TestPaletteSpawnProcessFormEmptyCommandCancels(t *testing.T) {
	p := newPalette(nil, "", preset.Set{})
	p.mode = paletteModeSpawnForm
	p.form = &spawnProcessForm{}
	action, done, _ := p.handleInput([]byte("\r"), 0)
	if !done || action.kind != "cancel" {
		t.Fatalf("empty submit didn't cancel: action=%+v done=%v", action, done)
	}
}

func TestPaletteSpawnProcessFormEscCancels(t *testing.T) {
	p := newPalette(nil, "", preset.Set{})
	p.mode = paletteModeSpawnForm
	p.form = &spawnProcessForm{cmd: []rune("x")}
	action, done, _ := p.handleInput([]byte{0x1b}, 0)
	if !done || action.kind != "cancel" {
		t.Fatalf("ESC didn't cancel form: action=%+v done=%v", action, done)
	}
}

// peekArrowEvent powers the chunk-level dedupe in processStdin. The
// scenarios below cover the patterns we've actually seen terminals
// emit for one physical Down press: a kitty press event, a legacy CSI
// arrow, and the pair of the two adjacent. We assert classification
// here so processStdin can rely on it.
func TestPeekArrowEventClassifies(t *testing.T) {
	cases := []struct {
		name    string
		in      []byte
		wantNav byte
		wantLen int
	}{
		{"legacy down", []byte("\x1b[B"), 'D', 3},
		{"legacy up", []byte("\x1b[A"), 'U', 3},
		{"kitty down press", []byte("\x1b[57353u"), 'D', 8},
		{"kitty up press", []byte("\x1b[57352u"), 'U', 8},
		{"kitty down release", []byte("\x1b[57353;1:3u"), 0, 12},
		{"kitty enter", []byte("\x1b[13u"), 0, 0},
		{"not a CSI", []byte("a"), 0, 0},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			nav, adv := peekArrowEvent(tc.in, 0)
			if nav != tc.wantNav || adv != tc.wantLen {
				t.Fatalf("got nav=%q len=%d, want nav=%q len=%d",
					nav, adv, tc.wantNav, tc.wantLen)
			}
		})
	}
}