package tui

import (
	"context"
	"errors"
	"strings"
	"testing"

	tea "github.com/charmbracelet/bubbletea"

	"proxyctl/internal/app"
	"proxyctl/internal/probe"
	"proxyctl/internal/profile"
)

func openProtocolProbeEditor(t *testing.T, module *recordingModule, detect func(context.Context, string) (probe.Capabilities, error), raw string) Model {
	t.Helper()
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	model.detect = detect
	model = updateKey(model, "m")
	model = updateKey(model, "n")
	model = updateRunes(model, "office")
	model = updateKey(model, "tab")
	return updateRunes(model, raw)
}

func startProtocolProbe(t *testing.T, model Model) (Model, tea.Cmd) {
	t.Helper()
	updated, command := model.Update(tea.KeyMsg{Type: tea.KeyCtrlD})
	model = updated.(Model)
	if command == nil {
		t.Fatal("Ctrl+D did not emit an explicit Protocol Probe command")
	}
	return model, command
}

func finishProtocolProbe(t *testing.T, model Model, command tea.Cmd) Model {
	t.Helper()
	updated, _ := model.Update(command())
	return updated.(Model)
}

func TestCompleteModelProtocolProbeIsVisibleExplicitAndFieldAttached(t *testing.T) {
	calls := 0
	module := &recordingModule{}
	model := openProtocolProbeEditor(t, module, func(_ context.Context, address string) (probe.Capabilities, error) {
		calls++
		return probe.Capabilities{HTTP: true}, nil
	}, "proxy.example:8080")

	view := model.View()
	assertUsableFrame(t, view, 80, 24, "Single proxy URL", "Protocol Probe [Ctrl+D]: available", "Ctrl+D: probe")
	if calls != 0 {
		t.Fatalf("opening, focusing, or editing the form ran %d hidden probes", calls)
	}

	model, command := startProtocolProbe(t, model)
	view = model.View()
	assertUsableFrame(t, view, 80, 24, "Protocol Probe: checking proxy.example:8080", "Protocol Probe in progress")
	if strings.Contains(view, "Status: Protocol Probe") {
		t.Fatalf("probe progress rendered as unrelated global status:\n%s", view)
	}
	field := strings.Index(view, "Single proxy URL")
	progress := strings.Index(view, "Protocol Probe: checking")
	if field < 0 || progress < field || strings.Count(view[field:progress], "\n") > 1 {
		t.Fatalf("probe progress was not attached directly to the initiating field:\n%s", view)
	}
	if calls != 0 {
		t.Fatalf("accepting the shortcut ran work synchronously; calls=%d", calls)
	}

	model = finishProtocolProbe(t, model, command)
	view = model.View()
	assertUsableFrame(t, view, 80, 24, "Protocol Probe: detected HTTP proxy at proxy.example:8080")
	if strings.Contains(view, "Status: Protocol Probe") {
		t.Fatalf("probe result rendered as unrelated global status:\n%s", view)
	}
	if calls != 1 {
		t.Fatalf("explicit probe ran %d times, want 1", calls)
	}

	model = updateKey(model, "ctrl+s")
	if calls != 1 {
		t.Fatalf("saving ran a hidden probe; calls=%d", calls)
	}
}

func TestCompleteModelProtocolProbeNeverRunsWithoutExplicitInvocation(t *testing.T) {
	calls := 0
	module := &recordingModule{}
	model := openProtocolProbeEditor(t, module, func(context.Context, string) (probe.Capabilities, error) {
		calls++
		return probe.Capabilities{HTTP: true}, nil
	}, "proxy.example:8080")

	model = updateKey(model, "tab")
	model = updateKey(model, "shift+tab")
	model = resize(model, 120, 36)
	model = updateKey(model, "ctrl+s")
	if calls != 0 {
		t.Fatalf("form entry, focus changes, resize, or save ran %d hidden probes", calls)
	}
	if len(module.intents) != 1 || module.intents[0].Kind != app.CreateProfile {
		t.Fatalf("ordinary save dispatched %#v", module.intents)
	}
}

func TestCompleteModelProtocolProbeCompletionPreservesAnotherEditedFieldsFocusCursorAndViewport(t *testing.T) {
	module := &recordingModule{}
	model := openProtocolProbeEditor(t, module, func(context.Context, string) (probe.Capabilities, error) {
		return probe.Capabilities{HTTP: true}, nil
	}, "proxy.example:8080")
	model, command := startProtocolProbe(t, model)

	model = updateKey(model, "shift+tab")
	model = editorKey(model, tea.KeyHome)
	model = updateRunes(model, "a-very-long-prefix-that-forces-the-name-field-to-scroll-horizontally-")
	model = editorKey(model, tea.KeyLeft)
	before := model.View()
	assertUsableFrame(t, before, 80, 24, "> Name [focused]", "Protocol Probe: checking proxy.example:8080")

	model = finishProtocolProbe(t, model, command)
	after := model.View()
	assertUsableFrame(t, after, 80, 24, "> Name [focused]", "Protocol Probe: detected HTTP proxy at proxy.example:8080")
	if fieldLine(before, "> Name [focused]") != fieldLine(after, "> Name [focused]") {
		t.Fatalf("non-mode-changing probe completion reset the edited field viewport or cursor:\nbefore:\n%s\nafter:\n%s", before, after)
	}

	model = updateRunes(model, "X")
	model = updateKey(model, "ctrl+s")
	if len(module.intents) != 1 {
		t.Fatalf("save after asynchronous completion dispatched %#v", module.intents)
	}
	if got, want := module.intents[0].Profile.Name, "a-very-long-prefix-that-forces-the-name-field-to-scroll-horizontallyX-office"; got != want {
		t.Fatalf("focus/cursor was not preserved: saved name = %q, want %q", got, want)
	}
	if got := module.intents[0].Profile.SingleURL; got != "http://proxy.example:8080" {
		t.Fatalf("probe did not update its affected URL input: %q", got)
	}
}

func fieldLine(frame, label string) string {
	for _, line := range strings.Split(frame, "\n") {
		if strings.Contains(line, label) {
			return line
		}
	}
	return ""
}

func TestCompleteModelProtocolProbePopulatesEstablishedCapabilityRepresentations(t *testing.T) {
	tests := []struct {
		name string
		caps probe.Capabilities
		want profile.Profile
		text string
	}{
		{
			name: "HTTP only", caps: probe.Capabilities{HTTP: true},
			want: profile.Profile{Mode: profile.SingleMode, SingleURL: "http://proxy.example:7890", HTTPURL: "http://proxy.example:7890", HTTPSURL: "http://proxy.example:7890", AllURL: "http://proxy.example:7890"},
			text: "detected HTTP proxy",
		},
		{
			name: "SOCKS5 only", caps: probe.Capabilities{SOCKS5: true},
			want: profile.Profile{Mode: profile.SingleMode, SingleURL: "socks5h://proxy.example:7890", HTTPURL: "socks5h://proxy.example:7890", HTTPSURL: "socks5h://proxy.example:7890", AllURL: "socks5h://proxy.example:7890"},
			text: "detected SOCKS5 proxy",
		},
		{
			name: "HTTP and SOCKS5", caps: probe.Capabilities{HTTP: true, SOCKS5: true},
			want: profile.Profile{Mode: profile.AdvancedMode, SingleURL: "proxy.example:7890", HTTPURL: "http://proxy.example:7890", HTTPSURL: "http://proxy.example:7890", AllURL: "socks5://proxy.example:7890"},
			text: "detected HTTP and SOCKS5 proxy",
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			module := &recordingModule{}
			model := openProtocolProbeEditor(t, module, func(context.Context, string) (probe.Capabilities, error) {
				return test.caps, nil
			}, "proxy.example:7890")
			model, command := startProtocolProbe(t, model)
			model = finishProtocolProbe(t, model, command)
			view := model.View()
			assertUsableFrame(t, view, 80, 24, test.text, "proxy.example:7890")
			if strings.Contains(view, "Status: Protocol Probe") {
				t.Fatalf("capability result detached into global status:\n%s", view)
			}
			attachedField := "Single proxy URL"
			if test.caps.HTTP && test.caps.SOCKS5 {
				attachedField = "Single proxy URL probe [read-only]"
			}
			field := strings.Index(view, attachedField)
			result := strings.Index(view, "Protocol Probe: detected")
			if field < 0 || result < field || strings.Count(view[field:result], "\n") > 1 {
				t.Fatalf("capability result was not attached to its initiating URL context:\n%s", view)
			}

			model = updateKey(model, "ctrl+s")
			if len(module.intents) != 1 || module.intents[0].Kind != app.CreateProfile {
				t.Fatalf("save after probe dispatched %#v", module.intents)
			}
			got := module.intents[0].Profile
			if got.Mode != test.want.Mode || got.SingleURL != test.want.SingleURL || got.HTTPURL != test.want.HTTPURL || got.HTTPSURL != test.want.HTTPSURL || got.AllURL != test.want.AllURL {
				t.Fatalf("saved capability representation = %#v, want %#v", got, test.want)
			}
		})
	}
}

func TestCompleteModelProtocolProbeDualResultRetainsSingleSourceAndLinksGeneratedFields(t *testing.T) {
	model := openProtocolProbeEditor(t, &recordingModule{}, func(context.Context, string) (probe.Capabilities, error) {
		return probe.Capabilities{HTTP: true, SOCKS5: true}, nil
	}, "proxy.example:7890")
	model, command := startProtocolProbe(t, model)
	model = finishProtocolProbe(t, model, command)
	view := model.View()
	assertUsableFrame(t, view, 80, 24,
		"Create Proxy Profile — advanced mode",
		"Single proxy URL probe [read-only]: proxy.example:7890",
		"Protocol Probe: detected HTTP and SOCKS5 proxy at proxy.example:7890",
		"Generated Advanced URL fields from this Single proxy URL probe:",
		"HTTP URL", "HTTPS URL", "ALL/SOCKS URL")
	if strings.Index(view, "Single proxy URL probe [read-only]") > strings.Index(view, "HTTP URL") {
		t.Fatalf("initiating Single URL context was not visibly linked before generated fields:\n%s", view)
	}
	if strings.Contains(fieldLine(view, "HTTP URL"), "Protocol Probe") {
		t.Fatalf("dual result was silently relabelled as an HTTP-field probe:\n%s", view)
	}
}

func TestCompleteModelProtocolProbeFailureAndUnrecognizedResultsRemainEditableAndSavable(t *testing.T) {
	tests := []struct {
		name string
		caps probe.Capabilities
		err  error
		text string
	}{
		{name: "failure", err: errors.New("connection refused"), text: "Protocol Probe failed for proxy.example:8080"},
		{name: "unrecognized", text: "Protocol Probe: unrecognized protocol at proxy.example:8080"},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			module := &recordingModule{}
			model := openProtocolProbeEditor(t, module, func(context.Context, string) (probe.Capabilities, error) {
				return test.caps, test.err
			}, "proxy.example:8080")
			model, command := startProtocolProbe(t, model)
			model = finishProtocolProbe(t, model, command)
			assertUsableFrame(t, model.View(), 80, 24, test.text)

			model = editorKey(model, tea.KeyHome)
			model = updateRunes(model, "http://")
			if strings.Contains(model.View(), "Protocol Probe:") || strings.Contains(model.View(), "Protocol Probe failed") {
				t.Fatalf("editing the URL left stale probe feedback:\n%s", model.View())
			}
			model = updateKey(model, "ctrl+s")
			if len(module.intents) != 1 || module.intents[0].Profile.SingleURL != "http://proxy.example:8080" {
				t.Fatalf("manual value was not savable after %s: %#v", test.name, module.intents)
			}
		})
	}
}

func TestCompleteModelProtocolProbeSuppressesDuplicateActiveInvocation(t *testing.T) {
	calls := 0
	model := openProtocolProbeEditor(t, &recordingModule{}, func(context.Context, string) (probe.Capabilities, error) {
		calls++
		return probe.Capabilities{HTTP: true}, nil
	}, "proxy.example:8080")
	model, command := startProtocolProbe(t, model)

	updated, duplicate := model.Update(tea.KeyMsg{Type: tea.KeyCtrlD})
	model = updated.(Model)
	if duplicate != nil {
		t.Fatal("repeated Ctrl+D emitted duplicate work while the same probe was active")
	}
	model = finishProtocolProbe(t, model, command)
	if calls != 1 {
		t.Fatalf("detector called %d times, want 1", calls)
	}
}

func TestCompleteModelProtocolProbeInvalidatesEveryStaleResultPath(t *testing.T) {
	tests := []struct {
		name   string
		change func(Model) Model
		check  func(*testing.T, Model, *recordingModule)
	}{
		{
			name:   "relevant URL edit",
			change: func(model Model) Model { return updateRunes(model, "0") },
			check: func(t *testing.T, model Model, _ *recordingModule) {
				if !strings.Contains(model.View(), "proxy.example:80800") {
					t.Fatalf("URL edit was not preserved:\n%s", model.View())
				}
			},
		},
		{
			name:   "mode change",
			change: func(model Model) Model { return updateKey(model, "ctrl+t") },
			check: func(t *testing.T, model Model, _ *recordingModule) {
				if !strings.Contains(model.View(), "advanced mode") {
					t.Fatalf("mode change was not preserved:\n%s", model.View())
				}
			},
		},
		{
			name: "rejected save",
			change: func(model Model) Model {
				model = updateKey(model, "shift+tab")
				model = editorKey(model, tea.KeyCtrlU)
				return updateKey(model, "ctrl+s")
			},
			check: func(t *testing.T, model Model, module *recordingModule) {
				if len(module.intents) != 0 || !strings.Contains(model.View(), "Profile name is required") {
					t.Fatalf("rejected save changed persistence or left the form: intents=%#v\n%s", module.intents, model.View())
				}
			},
		},
		{
			name:   "save",
			change: func(model Model) Model { return updateKey(model, "ctrl+s") },
			check: func(t *testing.T, model Model, module *recordingModule) {
				if !strings.Contains(model.View(), "Proxy Profile management") || len(module.intents) != 1 {
					t.Fatalf("save did not leave the form exactly once: intents=%#v\n%s", module.intents, model.View())
				}
			},
		},
		{
			name:   "cancel",
			change: func(model Model) Model { return updateKey(model, "esc") },
			check: func(t *testing.T, model Model, module *recordingModule) {
				if !strings.Contains(model.View(), "Proxy Profile management") || len(module.intents) != 0 {
					t.Fatalf("cancel changed persistence: intents=%#v\n%s", module.intents, model.View())
				}
			},
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			module := &recordingModule{}
			model := openProtocolProbeEditor(t, module, func(context.Context, string) (probe.Capabilities, error) {
				return probe.Capabilities{HTTP: true}, nil
			}, "proxy.example:8080")
			model, command := startProtocolProbe(t, model)
			model = test.change(model)
			model = finishProtocolProbe(t, model, command)
			test.check(t, model, module)
			view := model.View()
			if strings.Contains(view, "detected HTTP proxy") || strings.Contains(view, "http://proxy.example:8080") {
				t.Fatalf("stale result survived %s:\n%s", test.name, view)
			}
		})
	}
}

func TestCompleteModelProtocolProbeRejectsCancelledFormResultAfterAnotherProbeStarts(t *testing.T) {
	model := openProtocolProbeEditor(t, &recordingModule{}, func(context.Context, string) (probe.Capabilities, error) {
		return probe.Capabilities{HTTP: true}, nil
	}, "old.example:8080")
	model, oldCommand := startProtocolProbe(t, model)
	model = updateKey(model, "esc")

	model = updateKey(model, "n")
	model = updateRunes(model, "replacement")
	model = updateKey(model, "tab")
	model = updateRunes(model, "new.example:8080")
	model, newCommand := startProtocolProbe(t, model)
	model = finishProtocolProbe(t, model, oldCommand)
	view := model.View()
	assertUsableFrame(t, view, 80, 24, "new.example:8080", "Protocol Probe: checking new.example:8080")
	if strings.Contains(view, "old.example") || strings.Contains(view, "detected HTTP proxy") {
		t.Fatalf("cancelled form result completed a newer form's probe:\n%s", view)
	}

	model = finishProtocolProbe(t, model, newCommand)
	assertUsableFrame(t, model.View(), 80, 24, "Protocol Probe: detected HTTP proxy at new.example:8080")
}

func TestCompleteModelProtocolProbeSurvivesResizeWithoutRestartingOrDetaching(t *testing.T) {
	calls := 0
	model := openProtocolProbeEditor(t, &recordingModule{}, func(context.Context, string) (probe.Capabilities, error) {
		calls++
		return probe.Capabilities{SOCKS5: true}, nil
	}, "proxy.example:1080")
	model, command := startProtocolProbe(t, model)

	for _, size := range []struct{ width, height int }{{60, 16}, {120, 36}, {80, 24}} {
		model = resize(model, size.width, size.height)
		view := model.View()
		assertUsableFrame(t, view, size.width, size.height, "Protocol Probe: checking proxy.example:1080")
		if strings.Contains(view, "Status: Protocol Probe") {
			t.Fatalf("resize detached probe progress at %dx%d:\n%s", size.width, size.height, view)
		}
	}
	if calls != 0 {
		t.Fatalf("resize ran %d hidden probe calls", calls)
	}
	model = finishProtocolProbe(t, model, command)
	assertUsableFrame(t, model.View(), 80, 24, "detected SOCKS5 proxy at proxy.example:1080")
	if calls != 1 {
		t.Fatalf("probe ran %d times across resize, want 1", calls)
	}
}

func TestCompleteModelProtocolProbeKeepsAllUserinfoOutOfDialStatusErrorsAndEveryFormFrame(t *testing.T) {
	const (
		inputUser   = "alice-private"
		inputSecret = "input-secret"
		errorUser   = "mallory-private"
		errorSecret = "error-secret"
	)
	var dialed []string
	module := &recordingModule{}
	model := openProtocolProbeEditor(t, module, func(_ context.Context, address string) (probe.Capabilities, error) {
		dialed = append(dialed, address)
		return probe.Capabilities{}, errors.New("failed https://" + errorUser + ":" + errorSecret + "@evil.example:9999")
	}, inputUser+":"+inputSecret+"@proxy.example:8080")
	frames := []string{model.View()}
	model, command := startProtocolProbe(t, model)
	frames = append(frames, model.View())
	model = finishProtocolProbe(t, model, command)
	frames = append(frames, model.View())
	model = resize(model, 60, 16)
	frames = append(frames, model.View())
	model = resize(model, 80, 24)
	frames = append(frames, model.View())

	if len(dialed) != 1 || dialed[0] != "proxy.example:8080" {
		t.Fatalf("probe dial evidence = %#v, want credential-free endpoint", dialed)
	}
	for i, frame := range frames {
		for _, literal := range []string{inputUser, inputSecret, errorUser, errorSecret} {
			if strings.Contains(frame, literal) {
				t.Fatalf("form frame %d exposed userinfo literal %q:\n%s", i, literal, frame)
			}
		}
	}
	assertUsableFrame(t, frames[len(frames)-1], 80, 24, "Protocol Probe failed for proxy.example:8080")

	model = updateKey(model, "ctrl+s")
	if len(module.intents) != 1 || module.intents[0].Profile.SingleURL != "http://"+inputUser+":"+inputSecret+"@proxy.example:8080" {
		t.Fatalf("userinfo masking weakened saved Profile semantics: %#v", module.intents)
	}
}