package main

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

	"git.daviestechlabs.io/daviestechlabs/handler-base/messages"
	"git.daviestechlabs.io/daviestechlabs/handler-base/natsutil"
	"github.com/vmihailenco/msgpack/v5"
)

func TestPipelineTriggerDecode(t *testing.T) {
	req := messages.PipelineTrigger{
		RequestID:  "req-001",
		Pipeline:   "document-ingestion",
		Parameters: map[string]any{"source": "s3://bucket"},
	}
	data, err := msgpack.Marshal(&req)
	if err != nil {
		t.Fatal(err)
	}
	decoded, err := natsutil.Decode[messages.PipelineTrigger](data)
	if err != nil {
		t.Fatal(err)
	}
	if decoded.RequestID != "req-001" {
		t.Errorf("RequestID = %q", decoded.RequestID)
	}
	if decoded.Pipeline != "document-ingestion" {
		t.Errorf("Pipeline = %q", decoded.Pipeline)
	}
	if decoded.Parameters["source"] != "s3://bucket" {
		t.Errorf("Parameters = %v", decoded.Parameters)
	}
}

func TestPipelineStatusRoundtrip(t *testing.T) {
	status := messages.PipelineStatus{
		RequestID: "req-002",
		Status:    "submitted",
		RunID:     "argo-abc123",
		Engine:    "argo",
		Pipeline:  "batch-inference",
	}
	data, err := msgpack.Marshal(&status)
	if err != nil {
		t.Fatal(err)
	}
	var got messages.PipelineStatus
	if err := msgpack.Unmarshal(data, &got); err != nil {
		t.Fatal(err)
	}
	if got.RunID != "argo-abc123" {
		t.Errorf("RunID = %q", got.RunID)
	}
	if got.Engine != "argo" {
		t.Errorf("Engine = %q", got.Engine)
	}
}

func TestGetEnv(t *testing.T) {
	t.Setenv("TEST_HOST", "http://test:8080")
	if got := getEnv("TEST_HOST", "fallback"); got != "http://test:8080" {
		t.Errorf("getEnv(TEST_HOST) = %q, want %q", got, "http://test:8080")
	}
	if got := getEnv("MISSING_VAR_XYZ", "default"); got != "default" {
		t.Errorf("getEnv(MISSING) = %q, want %q", got, "default")
	}
}

func TestPipelinesMap(t *testing.T) {
	expected := []string{"document-ingestion", "batch-inference", "rag-query", "voice-pipeline", "model-evaluation"}
	for _, name := range expected {
		if _, ok := pipelines[name]; !ok {
			t.Errorf("pipeline %q not found in pipelines map", name)
		}
	}
	if got := pipelines["document-ingestion"].Engine; got != "argo" {
		t.Errorf("document-ingestion engine = %q, want argo", got)
	}
	if got := pipelines["rag-query"].Engine; got != "kubeflow" {
		t.Errorf("rag-query engine = %q, want kubeflow", got)
	}
}

func TestSubmitArgo(t *testing.T) {
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			t.Errorf("expected POST, got %s", r.Method)
		}
		if r.URL.Path != "/api/v1/workflows/ai-ml" {
			t.Errorf("unexpected path: %s", r.URL.Path)
		}
		if r.Header.Get("Content-Type") != "application/json" {
			t.Errorf("expected application/json content type")
		}

		var body map[string]any
		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
			t.Errorf("failed to decode body: %v", err)
		}
		wf, ok := body["workflow"].(map[string]any)
		if !ok {
			t.Fatal("missing workflow key")
		}
		meta := wf["metadata"].(map[string]any)
		if meta["namespace"] != "ai-ml" {
			t.Errorf("unexpected namespace: %v", meta["namespace"])
		}

		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]any{
			"metadata": map[string]any{"name": "document-ingestion-abc123"},
		})
	}))
	defer ts.Close()

	ctx := t.Context()
	runID, err := submitArgo(ctx, ts.Client(), ts.URL, "ai-ml", "document-ingestion", map[string]any{
		"source": "test",
	}, "req-001")
	if err != nil {
		t.Fatalf("submitArgo() error: %v", err)
	}
	if runID != "document-ingestion-abc123" {
		t.Errorf("runID = %q, want %q", runID, "document-ingestion-abc123")
	}
}

func TestSubmitArgoError(t *testing.T) {
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusBadRequest)
		w.Write([]byte(`{"message":"bad request"}`))
	}))
	defer ts.Close()

	ctx := t.Context()
	_, err := submitArgo(ctx, ts.Client(), ts.URL, "ai-ml", "bad-template", nil, "req-err")
	if err == nil {
		t.Fatal("expected error for 400 response")
	}
}

func TestSubmitKubeflow(t *testing.T) {
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			t.Errorf("expected POST, got %s", r.Method)
		}
		if r.URL.Path != "/apis/v1beta1/runs" {
			t.Errorf("unexpected path: %s", r.URL.Path)
		}

		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]any{
			"run": map[string]any{"id": "kf-run-456"},
		})
	}))
	defer ts.Close()

	ctx := t.Context()
	runID, err := submitKubeflow(ctx, ts.Client(), ts.URL, "rag-pipeline", map[string]any{
		"query": "test",
	}, "req-002")
	if err != nil {
		t.Fatalf("submitKubeflow() error: %v", err)
	}
	if runID != "kf-run-456" {
		t.Errorf("runID = %q, want %q", runID, "kf-run-456")
	}
}

func TestSubmitKubeflowError(t *testing.T) {
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("internal error"))
	}))
	defer ts.Close()

	ctx := t.Context()
	_, err := submitKubeflow(ctx, ts.Client(), ts.URL, "bad-pipeline", nil, "req-err2")
	if err == nil {
		t.Fatal("expected error for 500 response")
	}
}