package app_test

import (
	"context"
	"errors"
	"path/filepath"
	"strings"
	"testing"

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

type fakeTarget struct {
	available    bool
	state        target.State
	setErr       error
	setState     target.State
	confirmation string
	calls        []bool
}

func (f *fakeTarget) ID() string { return "shell" }
func (f *fakeTarget) Description() target.Description {
	return target.Description{Name: "Shell", Summary: "Shell summary", Details: "Shell details"}
}
func (f *fakeTarget) Availability(context.Context) target.Availability {
	return target.Availability{Available: f.available, Evidence: "fake detection"}
}
func (f *fakeTarget) Inspect(context.Context, *profile.Profile) target.Inspection {
	return target.Inspection{State: f.state, Evidence: "actual state"}
}
func (f *fakeTarget) Confirmation(bool) string { return f.confirmation }
func (f *fakeTarget) SetDesired(_ context.Context, enabled bool, _ *profile.Profile) target.OperationResult {
	f.calls = append(f.calls, enabled)
	if f.setErr == nil {
		if f.setState != "" {
			f.state = f.setState
		} else if enabled {
			f.state = target.Enabled
		} else {
			f.state = target.Disabled
		}
	}
	return target.OperationResult{Inspection: target.Inspection{State: f.state, Evidence: "re-inspected actual state"}, Err: f.setErr}
}

func TestApplicationTargetSeamRequiresActiveProfileAndReturnsTruthfulResults(t *testing.T) {
	adapter := &fakeTarget{available: true, state: target.External}
	application, err := app.NewWithTargets(profile.NewFileStore(filepath.Join(t.TempDir(), "profiles.json")), []target.Target{adapter})
	if err != nil {
		t.Fatal(err)
	}
	if result := application.Dispatch(app.Intent{Kind: app.RefreshTargets}); result.Err != nil {
		t.Fatal(result.Err)
	}
	initial := application.Snapshot()
	if len(initial.Targets) != 1 || initial.Targets[0].State != target.External || initial.Targets[0].Description.Summary != "Shell summary" {
		t.Fatalf("initial Target snapshot = %#v", initial.Targets)
	}

	result := application.Dispatch(app.Intent{Kind: app.ApplyProfileToTarget, TargetID: "shell"})
	if result.Err == nil || !strings.Contains(result.Err.Error(), "Profile management") || len(adapter.calls) != 0 || result.Snapshot.Targets[0].State != target.External {
		t.Fatalf("enable without Active Profile = %#v, calls=%v", result, adapter.calls)
	}

	createAndActivate(t, application)
	result = application.Dispatch(app.Intent{Kind: app.ApplyProfileToTarget, TargetID: "shell"})
	if result.Err != nil || result.Snapshot.Targets[0].State != target.Enabled || len(adapter.calls) != 1 {
		t.Fatalf("enable result = %#v", result)
	}

	adapter.setErr = errors.New("permission denied")
	adapter.state = target.Drifted
	result = application.Dispatch(app.Intent{Kind: app.RestoreOriginal, TargetID: "shell"})
	if result.Err == nil || result.Snapshot.Targets[0].State != target.Drifted || result.Snapshot.Targets[0].Evidence != "actual state" {
		t.Fatalf("failed operation not truthful: %#v", result)
	}
}

func TestApplicationRequiresTargetConfirmationBeforeMutation(t *testing.T) {
	adapter := &fakeTarget{available: true, state: target.Disabled, confirmation: "Docker will restart immediately and may disrupt running work."}
	application, err := app.NewWithTargets(profile.NewFileStore(filepath.Join(t.TempDir(), "profiles.json")), []target.Target{targetWithID{fakeTarget: adapter, id: "docker-daemon"}})
	if err != nil {
		t.Fatal(err)
	}
	createAndActivate(t, application)
	refreshApplicationTargets(t, application)

	warning := application.Dispatch(app.Intent{Kind: app.EnableTarget, TargetID: "docker-daemon"})
	if warning.ConfirmationRequest == nil || warning.Err != nil || len(adapter.calls) != 0 || warning.Snapshot.Targets[0].State != target.Disabled {
		t.Fatalf("unconfirmed result = %#v, calls=%v", warning, adapter.calls)
	}
	adapter.confirmation = "Updated restart warning after state changed."
	stale := application.Dispatch(app.Intent{Kind: app.EnableTarget, TargetID: "docker-daemon", Confirm: true, ConfirmationToken: warning.ConfirmationRequest.Token})
	if stale.ConfirmationRequest == nil || stale.ConfirmationRequest.Token == warning.ConfirmationRequest.Token || len(adapter.calls) != 0 {
		t.Fatalf("stale confirmation was accepted = %#v, calls=%v", stale, adapter.calls)
	}
	confirmed := application.Dispatch(app.Intent{Kind: app.EnableTarget, TargetID: "docker-daemon", Confirm: true, ConfirmationToken: stale.ConfirmationRequest.Token})
	if confirmed.Err != nil || len(adapter.calls) != 1 || confirmed.Snapshot.Targets[0].State != target.Enabled {
		t.Fatalf("confirmed result = %#v, calls=%v", confirmed, adapter.calls)
	}
}

type authorityTarget struct {
	*fakeTarget
	allowed bool
	reason  string
}

func (t *authorityTarget) MutationAuthority(context.Context) target.Check {
	return target.Check{Name: "mutation authority", OK: t.allowed, Evidence: t.reason}
}

func TestApplicationDisablesMutationWhenCurrentProcessLacksAuthority(t *testing.T) {
	adapter := &authorityTarget{fakeTarget: &fakeTarget{available: true, state: target.Disabled}, reason: "requires elevated authority"}
	application, err := app.NewWithTargets(profile.NewFileStore(filepath.Join(t.TempDir(), "profiles.json")), []target.Target{adapter})
	if err != nil {
		t.Fatal(err)
	}
	createAndActivate(t, application)
	refreshApplicationTargets(t, application)

	snapshot := application.Snapshot()
	if snapshot.Targets[0].PrimaryAction.Available || snapshot.Targets[0].PrimaryAction.DisabledReason != adapter.reason {
		t.Fatalf("authority policy = %#v", snapshot.Targets[0].PrimaryAction)
	}
	result := application.Dispatch(app.Intent{Kind: app.EnableTarget, TargetID: adapter.ID()})
	if result.Err == nil || !strings.Contains(result.Err.Error(), adapter.reason) || len(adapter.calls) != 0 {
		t.Fatalf("blocked mutation result = %#v calls=%v", result, adapter.calls)
	}
}

type targetWithID struct {
	*fakeTarget
	id string
}

func (t targetWithID) ID() string { return t.id }

func TestTargetMutationReportsLoggingFailureAfterKeepingAppliedState(t *testing.T) {
	adapter := &fakeTarget{available: true, state: target.Disabled}
	logger := &recordingLog{err: errors.New("log device full")}
	application, err := app.NewWithTargetsAndRuntime(profile.NewFileStore(filepath.Join(t.TempDir(), "profiles.json")), []target.Target{adapter}, nil, logger)
	if err != nil {
		t.Fatal(err)
	}
	createAndActivate(t, application)
	refreshApplicationTargets(t, application)

	result := application.Dispatch(app.Intent{Kind: app.EnableTarget, TargetID: adapter.ID()})
	if result.Err == nil || !strings.Contains(result.Err.Error(), "operation log") || result.Snapshot.Targets[0].State != target.Enabled {
		t.Fatalf("logging failure result = %#v", result)
	}
	if len(logger.entries) != 1 {
		t.Fatalf("log attempts = %#v", logger.entries)
	}
}

func TestApplicationHidesUnavailableTargetButKeepsExplanation(t *testing.T) {
	adapter := &fakeTarget{available: false, state: target.Disabled}
	application, err := app.NewWithTargets(profile.NewFileStore(filepath.Join(t.TempDir(), "profiles.json")), []target.Target{adapter})
	if err != nil {
		t.Fatal(err)
	}
	if result := application.Dispatch(app.Intent{Kind: app.RefreshTargets}); result.Err != nil {
		t.Fatal(result.Err)
	}
	got := application.Snapshot().Targets[0]
	if got.Available || got.AvailabilityEvidence != "fake detection" {
		t.Fatalf("unavailable Target = %#v", got)
	}
}

func refreshApplicationTargets(t *testing.T, application *app.Application) {
	t.Helper()
	if result := application.Dispatch(app.Intent{Kind: app.RefreshTargets}); result.Err != nil {
		t.Fatal(result.Err)
	}
}

func createAndActivate(t *testing.T, application *app.Application) {
	t.Helper()
	if result := application.Dispatch(app.Intent{Kind: app.CreateProfile, Profile: profile.Profile{Name: "office", SingleURL: "http://proxy.example:8080"}}); result.Err != nil {
		t.Fatal(result.Err)
	}
	if result := application.Dispatch(app.Intent{Kind: app.ActivateProfile, Name: "office"}); result.Err != nil {
		t.Fatal(result.Err)
	}
}