package service

import (
	"encoding/json"
	"io"
	"log"
	"testing"

	"github.com/seifghazi/claude-code-monitor/internal/config"
	"github.com/seifghazi/claude-code-monitor/internal/model"
)

func TestPrepareRequestBodyForStorage(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name   string
		cfg    *config.StorageConfig
		body   interface{}
		assert func(t *testing.T, got interface{})
	}{
		{
			name: "metadata only returns placeholder",
			cfg: &config.StorageConfig{
				MetadataOnly: true,
			},
			body: map[string]interface{}{"secret": "value"},
			assert: func(t *testing.T, got interface{}) {
				t.Helper()
				body, ok := got.(map[string]interface{})
				if !ok || body["_storage_mode"] != "metadata_only" {
					t.Fatalf("expected metadata_only placeholder, got %#v", got)
				}
			},
		},
		{
			name: "request capture disabled returns placeholder",
			cfg: &config.StorageConfig{
				CaptureRequestBody: false,
			},
			body: map[string]interface{}{"secret": "value"},
			assert: func(t *testing.T, got interface{}) {
				t.Helper()
				body, ok := got.(map[string]interface{})
				if !ok || body["_storage_mode"] != "request_body_disabled" {
					t.Fatalf("expected request_body_disabled placeholder, got %#v", got)
				}
			},
		},
		{
			name: "redacts nested fields",
			cfg: &config.StorageConfig{
				CaptureRequestBody: true,
				RedactedFields:     []string{"authorization", "password"},
			},
			body: map[string]interface{}{
				"authorization": "top-secret",
				"nested": map[string]interface{}{
					"password": "hide-me",
					"keep":     "visible",
				},
			},
			assert: func(t *testing.T, got interface{}) {
				t.Helper()
				body := got.(map[string]interface{})
				if body["authorization"] != redactionPlaceholder {
					t.Fatalf("expected top-level field redacted, got %#v", body["authorization"])
				}
				nested := body["nested"].(map[string]interface{})
				if nested["password"] != redactionPlaceholder {
					t.Fatalf("expected nested field redacted, got %#v", nested["password"])
				}
				if nested["keep"] != "visible" {
					t.Fatalf("expected keep field preserved, got %#v", nested["keep"])
				}
			},
		},
	}

	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			got, err := prepareRequestBodyForStorage(tt.cfg, tt.body)
			if err != nil {
				t.Fatalf("prepareRequestBodyForStorage() error = %v", err)
			}

			tt.assert(t, got)
		})
	}
}

func TestPrepareResponseForStorage(t *testing.T) {
	t.Parallel()

	logger := log.New(io.Discard, "", 0)

	t.Run("metadata only strips body fields", func(t *testing.T) {
		t.Parallel()

		got, err := prepareResponseForStorage(&config.StorageConfig{MetadataOnly: true}, logger, &model.ResponseLog{
			Body:            json.RawMessage(`{"secret":"value"}`),
			BodyText:        "raw",
			StreamingChunks: []string{"chunk"},
			ChunkTimings:    []model.ChunkTiming{{Index: 0}},
		})
		if err != nil {
			t.Fatalf("prepareResponseForStorage() error = %v", err)
		}
		if got == nil {
			t.Fatal("expected response clone")
		}
		if got.Body != nil || got.BodyText != "" || got.StreamingChunks != nil || got.ChunkTimings != nil {
			t.Fatalf("expected body fields stripped, got %#v", got)
		}
	})

	t.Run("redacts json response bodies", func(t *testing.T) {
		t.Parallel()

		got, err := prepareResponseForStorage(&config.StorageConfig{
			CaptureResponseBody: true,
			RedactedFields:      []string{"api_key"},
		}, logger, &model.ResponseLog{
			Body: json.RawMessage(`{"api_key":"secret","nested":{"keep":"ok"}}`),
		})
		if err != nil {
			t.Fatalf("prepareResponseForStorage() error = %v", err)
		}

		var body map[string]interface{}
		if err := json.Unmarshal(got.Body, &body); err != nil {
			t.Fatalf("unmarshal redacted body: %v", err)
		}
		if body["api_key"] != redactionPlaceholder {
			t.Fatalf("expected api_key redacted, got %#v", body["api_key"])
		}
		nested := body["nested"].(map[string]interface{})
		if nested["keep"] != "ok" {
			t.Fatalf("expected nested field preserved, got %#v", nested["keep"])
		}
	})

	t.Run("preserves non json body bytes", func(t *testing.T) {
		t.Parallel()

		original := json.RawMessage(`not-json`)
		got, err := prepareResponseForStorage(&config.StorageConfig{
			CaptureResponseBody: true,
			RedactedFields:      []string{"token"},
		}, logger, &model.ResponseLog{
			Body: original,
		})
		if err != nil {
			t.Fatalf("prepareResponseForStorage() error = %v", err)
		}
		if string(got.Body) != string(original) {
			t.Fatalf("expected original non-json body preserved, got %q", string(got.Body))
		}
	})
}