package redisprovider

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

	"github.com/redis/go-redis/v9"

	controllerProvider "proxy-pool/internal/controller/provider"
)

func TestNewRejectsInvalidDependenciesAndOptions(t *testing.T) {
	t.Parallel()
	client := redis.NewClient(&redis.Options{Addr: "127.0.0.1:0"})
	t.Cleanup(func() { _ = client.Close() })
	valid := Options{
		Namespace: "controller", HolderID: "controller-a", LeaseTTL: 3 * time.Second,
		RenewEvery: time.Second, RetryInterval: 50 * time.Millisecond, PermitGrace: time.Second,
	}
	var typedNil *redis.Client
	tests := []struct {
		name    string
		client  redis.Scripter
		options Options
	}{
		{name: "nil client", options: valid},
		{name: "typed nil client", client: typedNil, options: valid},
		{name: "empty namespace", client: client, options: withNamespace(valid, "")},
		{name: "unsafe namespace", client: client, options: withNamespace(valid, "bad:value")},
		{name: "empty holder", client: client, options: withHolder(valid, "")},
		{name: "zero lease", client: client, options: withLeaseTTL(valid, 0)},
		{name: "renew exceeds third", client: client, options: withRenewEvery(valid, 2*time.Second)},
		{name: "zero retry", client: client, options: withRetryInterval(valid, 0)},
		{name: "negative grace", client: client, options: withPermitGrace(valid, -1)},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			t.Parallel()
			adapter, err := New(test.client, test.options)
			if err == nil || adapter != nil {
				t.Fatalf("New() = (%v, %v), want nil adapter and error", adapter, err)
			}
		})
	}
}

func TestNewBuildsPerUpstreamClusterSafeKeys(t *testing.T) {
	t.Parallel()
	client := redis.NewClient(&redis.Options{Addr: "127.0.0.1:0"})
	t.Cleanup(func() { _ = client.Close() })
	adapter, err := New(client, Options{
		Namespace: " controller ", HolderID: "controller-a", LeaseTTL: 3 * time.Second,
		RenewEvery: time.Second, RetryInterval: 50 * time.Millisecond, PermitGrace: time.Second,
	})
	if err != nil {
		t.Fatalf("New(): %v", err)
	}
	keys, err := adapter.keys.forUpstream("provider:{unsafe}")
	if err != nil {
		t.Fatalf("forUpstream(): %v", err)
	}
	all := keys.all()
	for _, key := range all {
		if strings.Contains(key, "provider:{unsafe}") || strings.Count(key, "{") != 1 ||
			strings.Count(key, "}") != 1 || !strings.Contains(key, "{provider:") {
			t.Fatalf("unsafe provider coordination key %q", key)
		}
	}
	if strings.Split(all[0], "}")[0] != strings.Split(all[len(all)-1], "}")[0] {
		t.Fatalf("keys do not share one upstream hash tag: %v", all)
	}
	if _, err := adapter.keys.forUpstream(""); !errors.Is(err, controllerProvider.ErrInvalidCoordination) {
		t.Fatalf("forUpstream(empty) error = %v", err)
	}
}

func TestRunLeaderRejectsInvalidCalls(t *testing.T) {
	t.Parallel()
	var adapter *Adapter
	limits := controllerProvider.CoordinationLimits{
		RequestInterval: time.Second, MaxInFlight: 1, MaxAttemptDuration: time.Second,
	}
	work := func(context.Context, controllerProvider.LeaderSession) error { return nil }
	if err := adapter.RunLeader(context.Background(), "provider-a", limits, work); !errors.Is(err, controllerProvider.ErrInvalidCoordination) {
		t.Fatalf("nil adapter error = %v", err)
	}
}

func TestLeaderWorkResultPrefersParentCancellation(t *testing.T) {
	t.Parallel()
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	if err := leaderWorkResult(ctx, nil); !errors.Is(err, context.Canceled) {
		t.Fatalf("leaderWorkResult() error = %v, want context cancellation", err)
	}
}

func withNamespace(options Options, value string) Options {
	options.Namespace = value
	return options
}

func withHolder(options Options, value string) Options {
	options.HolderID = value
	return options
}

func withLeaseTTL(options Options, value time.Duration) Options {
	options.LeaseTTL = value
	return options
}

func withRenewEvery(options Options, value time.Duration) Options {
	options.RenewEvery = value
	return options
}

func withRetryInterval(options Options, value time.Duration) Options {
	options.RetryInterval = value
	return options
}

func withPermitGrace(options Options, value time.Duration) Options {
	options.PermitGrace = value
	return options
}