package handler

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

	"github.com/Tencent/WeKnora/internal/types"
	"github.com/gin-gonic/gin"
)

type runtimeTestSettings struct{}

func (runtimeTestSettings) GetInt(_ context.Context, key, _ string, def int64) int64 {
	switch key {
	case "asynq.core_concurrency":
		return 8
	case "asynq.postprocess_concurrency":
		return 2
	case "asynq.enrichment_concurrency":
		return 12
	case "asynq.maintenance_concurrency":
		return 4
	case "asynq.shared_concurrency":
		return 6
	case "asynq.wiki_concurrency":
		return 8
	default:
		return def
	}
}
func (runtimeTestSettings) GetString(_ context.Context, _, _, def string) string  { return def }
func (runtimeTestSettings) GetBool(_ context.Context, _, _ string, def bool) bool { return def }
func (runtimeTestSettings) GetStringList(_ context.Context, _, _ string, def []string) []string {
	return def
}
func (runtimeTestSettings) List(context.Context) ([]*types.SystemSetting, error) { return nil, nil }
func (runtimeTestSettings) Get(context.Context, string) (*types.SystemSetting, error) {
	return nil, nil
}
func (runtimeTestSettings) Update(context.Context, string, any) (*types.SystemSetting, error) {
	return nil, nil
}
func (runtimeTestSettings) Reset(context.Context, string) error  { return nil }
func (runtimeTestSettings) SubscribeRedis(context.Context) error { return nil }

type runtimeInvalidSettings struct{ runtimeTestSettings }

func (runtimeInvalidSettings) GetInt(_ context.Context, _ string, _ string, _ int64) int64 {
	return 0
}

type runtimeTestInspector struct{}

func (runtimeTestInspector) CancelTasksForKnowledge(context.Context, string) (int, int, error) {
	return 0, 0, nil
}
func (runtimeTestInspector) HasQueuedTasksForKnowledge(context.Context, string) (bool, error) {
	return false, nil
}
func (runtimeTestInspector) QueueStats(context.Context) ([]types.QueueStat, bool, error) {
	return []types.QueueStat{}, true, nil
}
func (runtimeTestInspector) WorkerServerStats(context.Context) ([]types.WorkerServerStat, bool, error) {
	return []types.WorkerServerStat{
		{Concurrency: 8, Active: 4, Status: "active", Queues: types.QueueWeightsForPool(types.WorkerPoolCore)},
		{Concurrency: 2, Active: 1, Status: "active", Queues: types.QueueWeightsForPool(types.WorkerPoolPostProcess)},
		{Concurrency: 12, Active: 6, Status: "active", Queues: types.QueueWeightsForPool(types.WorkerPoolEnrichment)},
		{Concurrency: 4, Active: 1, Status: "active", Queues: types.QueueWeightsForPool(types.WorkerPoolMaintenance)},
		{Concurrency: 6, Active: 3, Status: "active", Queues: types.QueueWeightsForSharedPool()},
		{Concurrency: 8, Active: 2, Status: "active", Queues: types.QueueWeightsForPool(types.WorkerPoolWiki)},
		{Concurrency: 99, Active: 0, Status: "stopped", Queues: types.QueueWeightsForPool(types.WorkerPoolCore)},
	}, true, nil
}

func TestGetRuntimeQueuesReportsIsolatedPoolCapacity(t *testing.T) {
	gin.SetMode(gin.TestMode)
	handler := &SystemHandler{
		systemSettingSvc: runtimeTestSettings{},
		taskInspector:    runtimeTestInspector{},
	}
	recorder := httptest.NewRecorder()
	ctx, _ := gin.CreateTestContext(recorder)
	ctx.Request = httptest.NewRequest(http.MethodGet, "/api/v1/system/admin/runtime/queues", nil)

	handler.GetRuntimeQueues(ctx)
	if recorder.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d; body=%s", recorder.Code, http.StatusOK, recorder.Body.String())
	}

	var response RuntimeQueuesResponse
	if err := json.Unmarshal(recorder.Body.Bytes(), &response); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if !response.Available {
		t.Fatal("queue inspection should be available")
	}
	if response.UpstreamConcurrency != 32 || response.ParseConcurrency != 32 {
		t.Fatalf("upstream compatibility values are wrong: %+v", response)
	}
	want := map[string]struct {
		concurrency int
		queueCount  int
	}{
		types.WorkerPoolCore:        {8, 1},
		types.WorkerPoolPostProcess: {2, 1},
		types.WorkerPoolEnrichment:  {12, 4},
		types.WorkerPoolMaintenance: {4, 2},
		types.WorkerPoolShared:      {6, 5},
		types.WorkerPoolWiki:        {8, 1},
	}
	if len(response.Pools) != len(want) {
		t.Fatalf("pool count = %d, want %d", len(response.Pools), len(want))
	}
	for _, pool := range response.Pools {
		expected, ok := want[pool.Name]
		if !ok {
			t.Fatalf("unexpected pool %q", pool.Name)
		}
		if pool.Concurrency != expected.concurrency || pool.QueueCount != expected.queueCount {
			t.Fatalf("pool %q = %+v, want concurrency=%d queue_count=%d",
				pool.Name, pool, expected.concurrency, expected.queueCount)
		}
		if pool.Instances != 1 || pool.ClusterCapacity != expected.concurrency {
			t.Fatalf("pool %q live capacity = %+v", pool.Name, pool)
		}
	}
}

func TestGetRuntimeQueuesFallsBackFromInvalidHistoricalConcurrency(t *testing.T) {
	gin.SetMode(gin.TestMode)
	handler := &SystemHandler{
		systemSettingSvc: runtimeInvalidSettings{},
		taskInspector:    runtimeTestInspector{},
	}
	recorder := httptest.NewRecorder()
	ctx, _ := gin.CreateTestContext(recorder)
	ctx.Request = httptest.NewRequest(http.MethodGet, "/api/v1/system/admin/runtime/queues", nil)

	handler.GetRuntimeQueues(ctx)

	var response RuntimeQueuesResponse
	if err := json.Unmarshal(recorder.Body.Bytes(), &response); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if response.UpstreamConcurrency != types.DefaultUpstreamWorkerConcurrency ||
		response.WikiConcurrency != types.DefaultWikiWorkerConcurrency {
		t.Fatalf("invalid stored values should use worker defaults: %+v", response)
	}
	for _, pool := range response.Pools {
		if pool.Concurrency < 1 {
			t.Fatalf("pool %q reported non-positive concurrency: %+v", pool.Name, pool)
		}
	}
}