package bootstrap

import (
	"context"
	"errors"
	"testing"
	"time"

	"proxy-pool/internal/config"
	controllerRuntime "proxy-pool/internal/controller/runtime"
	"proxy-pool/internal/domain/activitypool"
	"proxy-pool/internal/domain/adminstate"
	extractionDomain "proxy-pool/internal/domain/extraction"
)

func TestRunLoadsOneSnapshotCommitsItAndClosesInfrastructure(t *testing.T) {
	t.Parallel()
	resolver := &memoryResolver{files: map[string][]byte{"controller.yaml": []byte(bootstrapTestConfig)}}
	state := adminstate.NewMemoryStore()
	activity := &stubActivityStore{}
	closeErr := errors.New("close failed")
	infrastructure := &stubInfrastructure{ports: ports{
		state: state, activity: activity, readiness: readyStub{},
		close: func() error { return closeErr },
	}}
	runErr := errors.New("runtime failed")
	factory := &recordingRuntimeFactory{runner: runnerStub{err: runErr}}
	now := time.Date(2026, 7, 30, 11, 0, 0, 0, time.UTC)

	err := run(context.Background(), Options{
		ConfigPath: "controller.yaml", Resolver: resolver, Now: func() time.Time { return now },
	}, infrastructure, factory)
	if !errors.Is(err, runErr) || !errors.Is(err, closeErr) {
		t.Fatalf("run() error = %v, want runtime and close errors", err)
	}
	if resolver.reads != 1 {
		t.Fatalf("configuration reads = %d, want 1", resolver.reads)
	}
	if infrastructure.opens != 1 || infrastructure.configuration == nil {
		t.Fatalf("infrastructure opens = %d, config = %p", infrastructure.opens, infrastructure.configuration)
	}
	snapshot, snapshotErr := state.Snapshot(context.Background())
	if snapshotErr != nil || snapshot.Config == nil || snapshot.Config.Source != "controller.yaml" || snapshot.Revision != 1 {
		t.Fatalf("management snapshot = %+v, %v", snapshot, snapshotErr)
	}
	if factory.configuration == nil || factory.dependencies.Extractor == nil ||
		factory.dependencies.Readiness == nil || factory.dependencies.AdminService == nil {
		t.Fatalf("runtime assembly = config:%p dependencies:%+v", factory.configuration, factory.dependencies)
	}
}

func TestRunRejectsInvalidOptionsBeforeIO(t *testing.T) {
	t.Parallel()
	valid := Options{ConfigPath: "controller.yaml", Resolver: &memoryResolver{}, Now: time.Now}
	tests := []struct {
		name    string
		ctx     context.Context
		options Options
	}{
		{name: "nil context", options: valid},
		{name: "missing path", ctx: context.Background(), options: Options{Resolver: valid.Resolver, Now: time.Now}},
		{name: "unclean path", ctx: context.Background(), options: Options{ConfigPath: " controller.yaml", Resolver: valid.Resolver, Now: time.Now}},
		{name: "missing resolver", ctx: context.Background(), options: Options{ConfigPath: "controller.yaml", Now: time.Now}},
	}
	for _, test := range tests {
		test := test
		t.Run(test.name, func(t *testing.T) {
			t.Parallel()
			if err := run(test.ctx, test.options, &stubInfrastructure{}, &recordingRuntimeFactory{}); !errors.Is(err, ErrInvalidOptions) {
				t.Fatalf("run() error = %v", err)
			}
		})
	}
}

type memoryResolver struct {
	files map[string][]byte
	reads int
}

func (*memoryResolver) LookupEnv(string) (string, bool) { return "", false }

func (resolver *memoryResolver) ReadFile(path string) ([]byte, error) {
	resolver.reads++
	content, ok := resolver.files[path]
	if !ok {
		return nil, errors.New("file missing")
	}
	return append([]byte(nil), content...), nil
}

type stubInfrastructure struct {
	ports         ports
	err           error
	opens         int
	configuration *config.Config
}

func (infrastructure *stubInfrastructure) Open(
	_ context.Context,
	configuration *config.Config,
) (ports, error) {
	infrastructure.opens++
	infrastructure.configuration = configuration
	return infrastructure.ports, infrastructure.err
}

type recordingRuntimeFactory struct {
	configuration *config.Config
	dependencies  controllerRuntime.Dependencies
	runner        controllerRunner
	err           error
}

func (factory *recordingRuntimeFactory) New(
	configuration *config.Config,
	dependencies controllerRuntime.Dependencies,
	options controllerRuntime.Options,
) (controllerRunner, error) {
	factory.configuration = configuration
	factory.dependencies = dependencies
	return factory.runner, factory.err
}

type runnerStub struct{ err error }

func (runner runnerStub) Run(context.Context) error { return runner.err }

type readyStub struct{}

func (readyStub) Ready(context.Context) error { return nil }

type stubActivityStore struct{}

func (*stubActivityStore) Extract(_ context.Context, command extractionDomain.Command) (extractionDomain.Result, error) {
	return extractionDomain.Result{Requested: command.Requested}, nil
}

func (*stubActivityStore) ReadStateInventory(
	_ context.Context,
	upstreamIDs []string,
	_ time.Time,
) ([]activitypool.StateInventory, error) {
	result := make([]activitypool.StateInventory, len(upstreamIDs))
	for index, upstreamID := range upstreamIDs {
		result[index].UpstreamID = upstreamID
	}
	return result, nil
}

const bootstrapTestConfig = `
version: 1
security:
  requireProtectionOnPublicListen: true
gateway:
  enabled: false
distribution:
  enabled: true
  listen: 127.0.0.1:0
  auth: {mode: none}
  extraction:
    fulfillment: partial
    maxCountPerRequest: 20
    minRemainingTTL: 5s
    maxHealthCheckAge: 15s
    reserveForGateway: 5
    idempotencyTTL: 5m
admin:
  enabled: true
  listen: 127.0.0.1:0
  auth: {mode: none}
storage:
  postgresURL: postgres://fixture
  redisURL: redis://fixture
routing:
  - name: extract
    enabled: true
    purpose: extract
    upstreams: [provider-a, provider-b]
    strategy: {type: sequential, switchAfterEmptyFetch: 5, endBehavior: stayLast}
    onUnavailable: {action: reject}
upstreams:
  provider-a: &upstream
    enabled: true
    exposure: [extract]
    provider: {billingMode: fetch, protocols: [http]}
    api:
      url: https://provider.invalid/proxies
      method: GET
      template: '{{.}}'
      auth: {type: none}
    proxyAuth: {type: response}
    pool: {maxSize: 100}
    capacity: {maxConcurrencyPerProxy: 10}
    lifecycle: {ttl: 2m, allocationSafetyMargin: 10s}
    fetch: {requestInterval: 1s, timeout: 3s, maxAttempts: 3, maxInFlight: 1, maxTotal: 1000}
    check:
      interval: 30s
      jitter: 20
      maxInFlight: 100
      timeout: 2s
      maxAttempts: 2
      maxConsecutiveFailures: 3
      urls: [https://example.invalid/health]
  provider-b: *upstream
`