package mcp_test

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

	"github.com/mathiasbq/hyperguild/ingestion/internal/mcp"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func toolCall(t *testing.T, srv http.Handler, name string, args map[string]any) map[string]any {
	t.Helper()
	bodyBytes, err := json.Marshal(map[string]any{
		"jsonrpc": "2.0", "id": 1, "method": "tools/call",
		"params": map[string]any{"name": name, "arguments": args},
	})
	require.NoError(t, err)
	req := httptest.NewRequest(http.MethodPost, "/mcp", bytes.NewReader(bodyBytes))
	rr := httptest.NewRecorder()
	srv.ServeHTTP(rr, req)
	require.Equal(t, http.StatusOK, rr.Code)
	var resp map[string]any
	require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &resp))
	return resp
}

func TestBrainQueryReturnsResults(t *testing.T) {
	brainDir := t.TempDir()
	knowledge := filepath.Join(brainDir, "knowledge")
	require.NoError(t, os.MkdirAll(knowledge, 0o755))
	require.NoError(t, os.WriteFile(
		filepath.Join(knowledge, "tdd.md"),
		[]byte("# TDD\n\nTest-driven development is iterative.\n"),
		0o644,
	))

	srv := mcp.NewServer(brainDir, nil, nil)
	resp := toolCall(t, srv, "brain_query", map[string]any{"query": "tdd"})

	require.Nil(t, resp["error"])
	result := resp["result"].(map[string]any)
	content := result["content"].([]any)
	require.NotEmpty(t, content)
	text := content[0].(map[string]any)["text"].(string)
	assert.Contains(t, text, "tdd.md")
}

func TestBrainWriteCreatesFile(t *testing.T) {
	brainDir := t.TempDir()
	srv := mcp.NewServer(brainDir, nil, nil)

	resp := toolCall(t, srv, "brain_write", map[string]any{
		"content":  "# Test\n\nbody",
		"filename": "test.md",
		"type":     "note",
		"domain":   "personal",
	})
	require.Nil(t, resp["error"])

	got, err := os.ReadFile(filepath.Join(brainDir, "knowledge", "test.md"))
	require.NoError(t, err)
	assert.Contains(t, string(got), "type: note")
	assert.Contains(t, string(got), "domain: personal")
	assert.Contains(t, string(got), "# Test")
}

func TestBrainWriteRejectsTraversal(t *testing.T) {
	brainDir := t.TempDir()
	srv := mcp.NewServer(brainDir, nil, nil)

	resp := toolCall(t, srv, "brain_write", map[string]any{
		"content":  "x",
		"filename": "../escape.md",
	})
	require.NotNil(t, resp["error"])
}

func TestBrainWriteAcceptsDoubleDotInName(t *testing.T) {
	brainDir := t.TempDir()
	srv := mcp.NewServer(brainDir, nil, nil)

	resp := toolCall(t, srv, "brain_write", map[string]any{
		"content":  "x",
		"filename": "notes..draft.md",
	})
	require.Nil(t, resp["error"])

	_, err := os.Stat(filepath.Join(brainDir, "knowledge", "notes..draft.md"))
	require.NoError(t, err, "filename with embedded .. should be allowed")
}

func TestBrainIngestRawDryRun(t *testing.T) {
	brainDir := t.TempDir()
	require.NoError(t, os.MkdirAll(filepath.Join(brainDir, "wiki", "concepts"), 0o755))
	srv := mcp.NewServer(brainDir, nil, nil)

	resp := toolCall(t, srv, "brain_ingest_raw", map[string]any{
		"source":  "test-source",
		"dry_run": true,
		"pages": []map[string]any{
			{
				"title":   "Test Concept",
				"type":    "concept",
				"content": "## Definition\nA test concept.",
			},
		},
	})
	require.Nil(t, resp["error"])
	result := resp["result"].(map[string]any)
	content := result["content"].([]any)
	text := content[0].(map[string]any)["text"].(string)

	var parsed struct {
		Pages []string `json:"pages"`
	}
	require.NoError(t, json.Unmarshal([]byte(text), &parsed))
	require.NotEmpty(t, parsed.Pages, "expected at least one page path")
	assert.Contains(t, parsed.Pages[0], "wiki/concepts/test-concept.md")

	// dry_run: no file should exist
	_, err := os.Stat(filepath.Join(brainDir, "wiki", "concepts", "test-concept.md"))
	assert.True(t, os.IsNotExist(err))
}

func TestBrainIngestRejectsBoth(t *testing.T) {
	brainDir := t.TempDir()
	srv := mcp.NewServer(brainDir, nil, nil)

	resp := toolCall(t, srv, "brain_ingest", map[string]any{
		"content": "x",
		"source":  "y",
		"path":    "/tmp/foo.md",
	})
	require.NotNil(t, resp["error"])
}

func TestBrainIngestRequiresOne(t *testing.T) {
	brainDir := t.TempDir()
	srv := mcp.NewServer(brainDir, nil, nil)

	resp := toolCall(t, srv, "brain_ingest", map[string]any{})
	require.NotNil(t, resp["error"])
}

func TestBrainIngestRejectsContentWithoutSource(t *testing.T) {
	brainDir := t.TempDir()
	srv := mcp.NewServer(brainDir, nil, nil)

	resp := toolCall(t, srv, "brain_ingest", map[string]any{
		"content": "x",
	})
	require.NotNil(t, resp["error"])
}

func TestBrainIngestRequiresLLMConfigured(t *testing.T) {
	brainDir := t.TempDir()
	srv := mcp.NewServer(brainDir, nil, nil) // nil pipelineCfg → no LLM

	resp := toolCall(t, srv, "brain_ingest", map[string]any{
		"content": "some content",
		"source":  "test",
	})
	require.NotNil(t, resp["error"])
	errObj := resp["error"].(map[string]any)
	assert.Contains(t, errObj["message"].(string), "LLM not configured")
}

func TestSessionLogAppends(t *testing.T) {
	brainDir := t.TempDir()
	srv := mcp.NewServer(brainDir, nil, nil)

	resp := toolCall(t, srv, "session_log", map[string]any{
		"session_id":   "session-x",
		"skill":        "tdd",
		"phase":        "red",
		"final_status": "ok",
	})
	require.Nil(t, resp["error"])

	got, err := os.ReadFile(filepath.Join(brainDir, "sessions", "session-x.jsonl"))
	require.NoError(t, err)
	assert.Contains(t, string(got), `"skill":"tdd"`)
	assert.Contains(t, string(got), `"phase":"red"`)
}

func TestSessionLogRequiresSessionID(t *testing.T) {
	srv := mcp.NewServer(t.TempDir(), nil, nil)
	resp := toolCall(t, srv, "session_log", map[string]any{"skill": "tdd"})
	require.NotNil(t, resp["error"])
}