package pluginhost

import (
	"context"
	"encoding/json"
	"net/http"
	"testing"
	"time"

	"github.com/router-for-me/CLIProxyAPI/v7/sdk/pluginabi"
	"github.com/router-for-me/CLIProxyAPI/v7/sdk/pluginapi"
)

func TestRequestInterceptorTerminationStopsChain(t *testing.T) {
	lowCalls := 0
	host := newHostWithRecords(
		capabilityRecord{
			id:       "high",
			priority: 20,
			plugin: pluginapi.Plugin{Capabilities: pluginapi.Capabilities{
				RequestInterceptor: requestInterceptorFunc(func(context.Context, pluginapi.RequestInterceptRequest) (pluginapi.RequestInterceptResponse, error) {
					return pluginapi.RequestInterceptResponse{
						Terminate:       true,
						StatusCode:      http.StatusForbidden,
						ResponseHeaders: http.Header{"Content-Type": {"application/json"}},
						ResponseBody:    []byte(`{"error":"blocked"}`),
					}, nil
				}),
			}},
		},
		capabilityRecord{
			id:       "low",
			priority: 10,
			plugin: pluginapi.Plugin{Capabilities: pluginapi.Capabilities{
				RequestInterceptor: requestInterceptorFunc(func(context.Context, pluginapi.RequestInterceptRequest) (pluginapi.RequestInterceptResponse, error) {
					lowCalls++
					return pluginapi.RequestInterceptResponse{}, nil
				}),
			}},
		},
	)

	response := host.InterceptRequestBeforeAuth(context.Background(), pluginapi.RequestInterceptRequest{RequestID: "request-1"})
	if !response.Terminate || response.StatusCode != http.StatusForbidden {
		t.Fatalf("termination response = %#v", response)
	}
	if response.ResponseHeaders.Get("Content-Type") != "application/json" || string(response.ResponseBody) != `{"error":"blocked"}` {
		t.Fatalf("termination payload = %#v", response)
	}
	if lowCalls != 0 {
		t.Fatalf("lower-priority interceptor calls = %d, want 0", lowCalls)
	}
}

func TestCompleteRequestUsesUncancelledContextAndClonesMetadata(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	originalNested := map[string]any{"value": "original"}
	var got pluginapi.RequestCompletion
	var callbackContextError error
	done := make(chan struct{})
	host := newHostWithRecords(capabilityRecord{
		id: "lifecycle",
		plugin: pluginapi.Plugin{Capabilities: pluginapi.Capabilities{
			RequestLifecyclePlugin: requestLifecyclePluginFunc(func(callbackCtx context.Context, completion pluginapi.RequestCompletion) {
				callbackContextError = callbackCtx.Err()
				got = completion
				completion.Metadata["nested"].(map[string]any)["value"] = "mutated"
				close(done)
			}),
		}},
	})

	host.CompleteRequest(ctx, pluginapi.RequestCompletion{
		RequestID:   "request-1",
		Outcome:     pluginapi.RequestCompletionCanceled,
		StartedAt:   time.Now().Add(-time.Second),
		CompletedAt: time.Now(),
		Metadata:    map[string]any{"nested": originalNested},
	})
	<-done

	if callbackContextError != nil {
		t.Fatalf("callback context error = %v", callbackContextError)
	}
	if got.RequestID != "request-1" || got.Outcome != pluginapi.RequestCompletionCanceled {
		t.Fatalf("completion = %#v", got)
	}
	if originalNested["value"] != "original" {
		t.Fatalf("input metadata was mutated: %#v", originalNested)
	}
}

func TestCompleteRequestDoesNotWaitForBlockingPlugin(t *testing.T) {
	started := make(chan struct{})
	release := make(chan struct{})
	host := newHostWithRecords(capabilityRecord{
		id: "blocking-lifecycle",
		plugin: pluginapi.Plugin{Capabilities: pluginapi.Capabilities{
			RequestLifecyclePlugin: requestLifecyclePluginFunc(func(context.Context, pluginapi.RequestCompletion) {
				close(started)
				<-release
			}),
		}},
	})

	returned := make(chan struct{})
	go func() {
		host.CompleteRequest(context.Background(), pluginapi.RequestCompletion{RequestID: "request-blocking"})
		close(returned)
	}()
	select {
	case <-returned:
	case <-time.After(time.Second):
		t.Fatal("CompleteRequest blocked on lifecycle plugin")
	}
	select {
	case <-started:
	case <-time.After(time.Second):
		t.Fatal("lifecycle plugin was not invoked")
	}
	close(release)
}

func TestRPCCapabilitiesAndAdapterIncludeRequestLifecycle(t *testing.T) {
	var got pluginapi.RequestCompletion
	plugin := validTestPlugin("request-lifecycle")
	plugin.Capabilities.RequestLifecyclePlugin = requestLifecyclePluginFunc(func(_ context.Context, completion pluginapi.RequestCompletion) {
		got = completion
	})
	caps := rpcCapabilitiesFromPlugin(plugin)
	if !caps.RequestLifecyclePlugin {
		t.Fatal("RequestLifecyclePlugin = false, want true")
	}
	rawCaps, errMarshal := json.Marshal(caps)
	if errMarshal != nil {
		t.Fatalf("Marshal() error = %v", errMarshal)
	}
	var decoded map[string]any
	if errUnmarshal := json.Unmarshal(rawCaps, &decoded); errUnmarshal != nil {
		t.Fatalf("Unmarshal() error = %v", errUnmarshal)
	}
	if decoded["request_lifecycle_plugin"] != true {
		t.Fatalf("request_lifecycle_plugin = %#v", decoded["request_lifecycle_plugin"])
	}

	lookup := newTestSymbolLookup(&testPlugin{registerResult: plugin})
	registered, errRegister := registerRPCPlugin(context.Background(), nil, "request-lifecycle", lookup, pluginabi.MethodPluginRegister, nil)
	if errRegister != nil {
		t.Fatalf("registerRPCPlugin() error = %v", errRegister)
	}
	if registered.Capabilities.RequestLifecyclePlugin == nil {
		t.Fatal("RequestLifecyclePlugin = nil, want RPC adapter")
	}
	if errComplete := registered.Capabilities.RequestLifecyclePlugin.HandleRequestComplete(context.Background(), pluginapi.RequestCompletion{
		RequestID: "request-rpc",
		Outcome:   pluginapi.RequestCompletionSucceeded,
	}); errComplete != nil {
		t.Fatalf("HandleRequestComplete() error = %v", errComplete)
	}
	if got.RequestID != "request-rpc" || got.Outcome != pluginapi.RequestCompletionSucceeded {
		t.Fatalf("RPC completion = %#v", got)
	}
}