package tui

import (
	"bytes"
	"errors"
	"fmt"
	"regexp"
	"strings"
	"testing"

	tea "github.com/charmbracelet/bubbletea"

	"proxyctl/internal/app"
	"proxyctl/internal/profile"
	"proxyctl/internal/target"
)

func TestCompleteModelRendersResponsiveTerminalSizeClasses(t *testing.T) {
	module := responsiveLayoutModule()

	t.Run("wide 120x36", func(t *testing.T) {
		model := resizedModel(t, module, themeModeNoColor, 120, 36)
		view := model.View()
		if !sameLine(view, "Targets", "Target details") {
			t.Fatalf("wide layout did not place list and details side by side:\n%s", view)
		}
		assertUsableFrame(t, view, 120, 36, "Shell", "Shell summary", "Active Profile: office")
	})

	t.Run("narrow 80x24", func(t *testing.T) {
		model := resizedModel(t, module, themeModeNoColor, 80, 24)
		view := model.View()
		if sameLine(view, "Targets", "Target details") || strings.Index(view, "Target details") < strings.Index(view, "Shell") {
			t.Fatalf("narrow layout did not stack list above details:\n%s", view)
		}
		assertUsableFrame(t, view, 80, 24, "Shell", "Shell summary", "Active Profile: office")
	})

	t.Run("below minimum 59x15", func(t *testing.T) {
		model := resizedModel(t, module, themeModeNoColor, 59, 15)
		view := model.View()
		assertUsableFrame(t, view, 59, 15, "Terminal too small", "Minimum size: 60×16", "Current size: 59×15")
		if strings.Contains(view, "Shell summary") || strings.Contains(view, "Targets\n") {
			t.Fatalf("minimum-size message was mixed with the application interface:\n%s", view)
		}
	})
}

func TestCompleteModelResizePreservesValidSelectionAndFormFocus(t *testing.T) {
	module := responsiveLayoutModule()
	model := resizedModel(t, module, themeModeNoColor, 120, 36)
	model = updateKey(model, "down")
	model = resize(model, 80, 24)
	if view := model.View(); !strings.Contains(view, "> ◇ External  APT") || !strings.Contains(view, "Action: Apply Profile") {
		t.Fatalf("Target selection did not survive wide-to-narrow resize:\n%s", view)
	}
	model = resize(model, 120, 36)
	if view := model.View(); !strings.Contains(view, "> ◇ External  APT") || !strings.Contains(view, "Action: Apply Profile") {
		t.Fatalf("Target selection did not survive narrow-to-wide resize:\n%s", view)
	}

	model = updateKey(model, "p")
	model = updateKey(model, "e")
	model = updateKey(model, "ctrl+t")
	for range 4 {
		model = updateKey(model, "tab")
	}
	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, "> Bypass:", "Ctrl+S: save")
	}
}

func TestCompleteModelSemanticThemeSupportsDarkLightAndNoColor(t *testing.T) {
	module := responsiveLayoutModule()
	dark := resizedModel(t, module, themeModeDark, 80, 24).View()
	light := resizedModel(t, module, themeModeLight, 80, 24).View()
	plain := resizedModel(t, module, themeModeNoColor, 80, 24).View()

	for name, view := range map[string]string{"dark": dark, "light": light, "NO_COLOR": plain} {
		for _, semantic := range []string{"Active Profile: office", "Disabled", "External", ">"} {
			if !strings.Contains(view, semantic) {
				t.Fatalf("%s theme lost non-color semantic %q:\n%s", name, semantic, view)
			}
		}
	}
	if !strings.Contains(dark, "\x1b[") || !strings.Contains(light, "\x1b[") {
		t.Fatalf("light or dark semantic theme emitted no styling\ndark: %q\nlight: %q", dark, light)
	}
	if dark == light {
		t.Fatal("light and dark themes rendered identically")
	}
	if ansiPattern.MatchString(plain) {
		t.Fatalf("NO_COLOR rendering contained ANSI styling: %q", plain)
	}
}

func TestNewModelUsesInjectedBubbleTeaOutputForTerminalCapabilities(t *testing.T) {
	var bubbleTeaOutput bytes.Buffer
	model := resize(NewModel(responsiveLayoutModule(), WithOutput(&bubbleTeaOutput)), 80, 24)
	view := model.View()
	if ansiPattern.MatchString(view) {
		t.Fatalf("non-terminal Bubble Tea output received ANSI styling: %q", view)
	}
	for _, semantic := range []string{"Active Profile: office", "Disabled", "External", ">"} {
		if !strings.Contains(view, semantic) {
			t.Fatalf("injected-output rendering lost semantic %q:\n%s", semantic, view)
		}
	}
}

func TestCompleteModelRespectsNoColorEnvironment(t *testing.T) {
	t.Setenv("NO_COLOR", "1")
	model := resize(NewModel(responsiveLayoutModule()), 80, 24)
	view := model.View()
	if ansiPattern.MatchString(view) {
		t.Fatalf("NO_COLOR environment produced ANSI styling: %q", view)
	}
	for _, semantic := range []string{"Disabled", "External", ">"} {
		if !strings.Contains(view, semantic) {
			t.Fatalf("NO_COLOR environment lost semantic %q:\n%s", semantic, view)
		}
	}
}

func TestCompleteModelDefensivelyRedactsEveryRenderedPage(t *testing.T) {
	const (
		secret     = "foundation-secret"
		credential = "https://alice:" + secret + "@proxy.example:8443"
		redacted   = "https://alice:REDACTED@proxy.example:8443"
	)
	module := &recordingModule{snapshot: app.Snapshot{
		ActiveProfile: credential,
		Profiles: []profile.Profile{{
			Name: credential, Mode: profile.SingleMode, SingleURL: credential, Bypass: []string{credential},
		}},
		Targets: []app.TargetSnapshot{{
			ID:          credential,
			Description: target.Description{Name: credential, Summary: credential, Details: credential},
			Available:   true, State: target.External, Evidence: credential, AvailabilityEvidence: credential,
		}},
	}}
	model := resizedModel(t, module, themeModeNoColor, 120, 36)

	frames := []string{model.View()}
	model = updateKey(model, "?")
	frames = append(frames, model.View())
	model = updateKey(model, "q")
	model = updateKey(model, "p")
	frames = append(frames, model.View())
	model = updateKey(model, "e")
	frames = append(frames, model.View())
	model.status = "operation failed for " + credential
	frames = append(frames, model.View())

	for i, frame := range frames {
		if strings.Contains(frame, secret) {
			t.Fatalf("frame %d exposed a credential:\n%s", i, frame)
		}
		if !strings.Contains(frame, redacted) {
			t.Fatalf("frame %d did not apply the presentation redaction path:\n%s", i, frame)
		}
	}
}

func TestCompleteModelRedactsApplicationErrorsBeforeRendering(t *testing.T) {
	const secret = "result-secret"
	initial := app.Snapshot{Targets: []app.TargetSnapshot{{ID: "shell", Description: target.Description{Name: "Shell"}, Available: true, State: target.Disabled}}}
	module := &targetModule{snapshot: initial, result: app.Result{Snapshot: initial, Err: errors.New("failed https://bob:" + secret + "@proxy.example:8080")}}
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	updated, cmd := model.Update(keyMessage("r"))
	model = updated.(Model)
	updated, _ = model.Update(cmd())
	model = updated.(Model)
	model = updateKey(model, "e")
	view := model.View()
	if strings.Contains(view, secret) || !strings.Contains(view, "https://bob:REDACTED@proxy.example:8080") {
		t.Fatalf("Application error bypassed presentation redaction:\n%s", view)
	}
}

func TestCompleteModelNarrowShellKeepsLastProductionTargetStatusAndActionsVisible(t *testing.T) {
	snapshot := productionScaleSnapshot()
	longNotice := "Refresh completed; selected Target remains actionable. " + strings.Repeat("Additional redacted diagnostic context. ", 12)
	module := &targetModule{snapshot: snapshot, result: app.Result{Snapshot: snapshot, Notice: longNotice}}
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	for range len(snapshot.Targets) - 1 {
		model = updateKey(model, "down")
	}

	updated, refresh := model.Update(keyMessage("r"))
	model = updated.(Model)
	updated, _ = model.Update(refresh())
	model = updated.(Model)

	assertUsableFrame(t, model.View(), 80, 24,
		"> ! Drifted  Docker daemon",
		"State: ! Drifted",
		"Docker daemon selected evidence.",
		"Status: Refresh completed; selected Target remains actionable.",
		"Space: Resolve",
		"p: manage Proxy Profiles",
	)

	model = resize(model, 120, 36)
	model = resize(model, 80, 24)
	assertUsableFrame(t, model.View(), 80, 24,
		"> ! Drifted  Docker daemon",
		"State: ! Drifted",
		"Docker daemon selected evidence.",
		"Space: Resolve",
	)
}

func TestCompleteModelLongProfileListKeepsLastSelectionDetailsAndActionsVisibleAcrossResize(t *testing.T) {
	profiles := make([]profile.Profile, 32)
	for i := range profiles {
		profiles[i] = profile.Profile{
			Name:      fmt.Sprintf("regional-office-%02d", i),
			Mode:      profile.SingleMode,
			SingleURL: fmt.Sprintf("http://proxy-%02d.example:8080", i),
		}
	}
	module := &recordingModule{snapshot: app.Snapshot{ActiveProfile: profiles[0].Name, Profiles: profiles}}
	model := resizedModel(t, module, themeModeNoColor, 80, 24)
	model = updateKey(model, "p")
	for range len(profiles) - 1 {
		model = updateKey(model, "down")
	}

	for _, size := range []struct{ width, height int }{{80, 24}, {120, 36}, {80, 24}} {
		model = resize(model, size.width, size.height)
		assertUsableFrame(t, model.View(), size.width, size.height,
			">   regional-office-31",
			"Proxy: http://proxy-31.example:8080",
			"a/Enter: activate",
			"q/Esc: back",
		)
	}
}

func productionScaleSnapshot() app.Snapshot {
	return app.Snapshot{
		ActiveProfile: "office",
		Profiles:      []profile.Profile{{Name: "office", Mode: profile.SingleMode, SingleURL: "http://proxy.example:8080"}},
		Targets: []app.TargetSnapshot{
			{ID: "shell", Description: target.Description{Name: "Shell", Summary: "Shell summary", Details: strings.Repeat("Shell detail. ", 30)}, Available: true, State: target.Enabled, Evidence: strings.Repeat("Shell evidence. ", 20)},
			{ID: "apt", Description: target.Description{Name: "APT", Summary: "APT summary", Details: strings.Repeat("APT detail. ", 30)}, Available: true, State: target.Disabled, Evidence: strings.Repeat("APT evidence. ", 20)},
			{ID: "docker-containers", Description: target.Description{Name: "Docker containers/builds", Summary: "Docker client summary", Details: strings.Repeat("Docker client detail. ", 30)}, Available: true, State: target.External, Evidence: strings.Repeat("Docker client evidence. ", 20)},
			{ID: "gnome", Description: target.Description{Name: "GNOME", Summary: "GNOME summary", Details: strings.Repeat("GNOME detail. ", 30)}, Available: true, State: target.Enabled, Evidence: strings.Repeat("GNOME evidence. ", 20)},
			{ID: "docker-daemon", Description: target.Description{Name: "Docker daemon", Summary: "Docker daemon selected summary", Details: strings.Repeat("Docker daemon selected detail. ", 30)}, Available: true, State: target.Drifted, Evidence: strings.Repeat("Docker daemon selected evidence. ", 20)},
		},
	}
}

var ansiPattern = regexp.MustCompile(`\x1b\[[0-9;?]*[ -/]*[@-~]`)

func responsiveLayoutModule() *recordingModule {
	return &recordingModule{snapshot: app.Snapshot{
		ActiveProfile: "office",
		Profiles:      []profile.Profile{{Name: "office", Mode: profile.SingleMode, SingleURL: "http://proxy.example:8080"}},
		Targets: []app.TargetSnapshot{
			{ID: "shell", Description: target.Description{Name: "Shell", Summary: "Shell summary", Details: "Shell details"}, Available: true, State: target.Disabled, Evidence: "Shell evidence"},
			{ID: "apt", Description: target.Description{Name: "APT", Summary: "APT summary", Details: "APT details"}, Available: true, State: target.External, Evidence: "APT evidence"},
		},
	}}
}

func resizedModel(t *testing.T, module app.InteractiveModule, mode themeMode, width, height int) Model {
	t.Helper()
	return resize(NewModel(module, withTheme(mode)), width, height)
}

func resize(model Model, width, height int) Model {
	updated, _ := model.Update(tea.WindowSizeMsg{Width: width, Height: height})
	return updated.(Model)
}

func sameLine(view, first, second string) bool {
	for _, line := range strings.Split(view, "\n") {
		if strings.Contains(line, first) && strings.Contains(line, second) {
			return true
		}
	}
	return false
}

func assertUsableFrame(t *testing.T, view string, width, height int, semantics ...string) {
	t.Helper()
	lines := strings.Split(strings.TrimSuffix(view, "\n"), "\n")
	if len(lines) > height {
		t.Fatalf("frame has %d lines, terminal height is %d:\n%s", len(lines), height, view)
	}
	for _, line := range lines {
		if len([]rune(line)) > width {
			t.Fatalf("frame line is wider than %d columns: %q", width, line)
		}
	}
	for _, semantic := range semantics {
		if !strings.Contains(view, semantic) {
			t.Fatalf("frame missing %q:\n%s", semantic, view)
		}
	}
}