package mcp_test

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

	"github.com/mathiasbq/hyperguild/ingestion/internal/audit"
	"github.com/mathiasbq/hyperguild/ingestion/internal/brainstore"
	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
	"github.com/mathiasbq/hyperguild/ingestion/internal/capturehttp"
	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
	"github.com/mathiasbq/hyperguild/ingestion/internal/mcp"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

const capStaticTok = "cap-static-tok"

type capFakeTracker struct{}

func (capFakeTracker) CreateIssue(context.Context, string, string, string) (capture.IssueRef, error) {
	return capture.IssueRef{Repo: "hyperguild", Number: 1, URL: "https://git/1"}, nil
}
func (capFakeTracker) CloseIssue(context.Context, string, int, string) (capture.IssueRef, error) {
	return capture.IssueRef{}, nil
}
func (capFakeTracker) CommentIssue(context.Context, string, int, string) (capture.IssueRef, error) {
	return capture.IssueRef{}, nil
}

type capFakeValidator struct {
	subject string
	err     error
}

func (v capFakeValidator) Validate(context.Context, string) (string, error) {
	return v.subject, v.err
}

func captureServer(t *testing.T, validator capturehttp.Validator, sovereign []string) (*mcp.Server, string) {
	t.Helper()
	brainDir := t.TempDir()
	cfg, err := classification.Load(brainDir)
	require.NoError(t, err)
	svc := capture.NewService(brainstore.New(brainDir), capFakeTracker{}, nil, cfg, audit.NewSlogSink(nil))
	srv := mcp.NewServer(brainDir, nil, nil, nil)
	srv.WithCapture(svc, validator, capStaticTok, "local-cli", capturehttp.NewOriginResolver(sovereign))
	return srv, brainDir
}

func captureCall(t *testing.T, srv http.Handler, authz string, args map[string]any) map[string]any {
	t.Helper()
	body, _ := json.Marshal(map[string]any{
		"jsonrpc": "2.0", "id": 1, "method": "tools/call",
		"params": map[string]any{"name": "capture", "arguments": args},
	})
	req := httptest.NewRequest(http.MethodPost, "/mcp", bytes.NewReader(body))
	if authz != "" {
		req.Header.Set("Authorization", authz)
	}
	rr := httptest.NewRecorder()
	srv.ServeHTTP(rr, req)
	var resp map[string]any
	require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &resp))
	return resp
}

func TestCaptureToolListedWhenWired(t *testing.T) {
	srv, _ := captureServer(t, nil, nil)
	body, _ := json.Marshal(map[string]any{"jsonrpc": "2.0", "id": 1, "method": "tools/list"})
	req := httptest.NewRequest(http.MethodPost, "/mcp", bytes.NewReader(body))
	rr := httptest.NewRecorder()
	srv.ServeHTTP(rr, req)
	assert.Contains(t, rr.Body.String(), `"capture"`)
}

func TestCaptureToolNotListedByDefault(t *testing.T) {
	srv := mcp.NewServer(t.TempDir(), nil, nil, nil) // no WithCapture
	body, _ := json.Marshal(map[string]any{"jsonrpc": "2.0", "id": 1, "method": "tools/list"})
	req := httptest.NewRequest(http.MethodPost, "/mcp", bytes.NewReader(body))
	rr := httptest.NewRecorder()
	srv.ServeHTTP(rr, req)
	assert.NotContains(t, rr.Body.String(), `"capture"`)
}

func TestCaptureToolForwardsViaStaticPrincipal(t *testing.T) {
	srv, brainDir := captureServer(t, nil, nil)
	resp := captureCall(t, srv, "Bearer "+capStaticTok, map[string]any{
		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "internal"},
		"insights": []map[string]any{{"text": "a fact", "wing": "hyperguild", "hall": "facts"}},
		"tickets":  []map[string]any{{"repo": "hyperguild", "action": "create", "title": "t"}},
	})
	require.Nil(t, resp["error"], "got error: %v", resp["error"])
	text := resp["result"].(map[string]any)["content"].([]any)[0].(map[string]any)["text"].(string)
	var rec capture.CaptureReceipt
	require.NoError(t, json.Unmarshal([]byte(text), &rec))
	assert.True(t, rec.Insights[0].OK)
	assert.True(t, rec.Tickets[0].OK)
	// Forwarded to the real brain store.
	_, statErr := os.Stat(filepath.Join(brainDir, "wiki/hyperguild/facts"))
	require.NoError(t, statErr)
}

func TestCaptureToolRefusesConfidentialViaUSNexus(t *testing.T) {
	// JWT principal not in the sovereign allowlist ⇒ us-nexus origin.
	srv, _ := captureServer(t, capFakeValidator{subject: "claudeai-oauth"}, nil)
	resp := captureCall(t, srv, "Bearer jwt-token", map[string]any{
		"context":  map[string]any{"harness": "claudeai-chat", "actor": "mathias", "classification": "confidential"},
		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
	})
	require.NotNil(t, resp["error"])
	assert.Contains(t, resp["error"].(map[string]any)["message"].(string), "sovereignty")
}

func TestCaptureToolAllowsConfidentialViaSovereignJWT(t *testing.T) {
	srv, _ := captureServer(t, capFakeValidator{subject: "koala-cli"}, []string{"koala-cli"})
	resp := captureCall(t, srv, "Bearer jwt-token", map[string]any{
		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "confidential"},
		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
	})
	assert.Nil(t, resp["error"], "sovereign JWT principal should be allowed: %v", resp["error"])
}

func TestCaptureToolRejectsUnauthenticated(t *testing.T) {
	srv, _ := captureServer(t, capFakeValidator{err: errors.New("no jwt")}, nil)
	resp := captureCall(t, srv, "", map[string]any{ // no Authorization
		"context":  map[string]any{"harness": "x", "classification": "internal"},
		"insights": []map[string]any{{"text": "a", "wing": "hyperguild", "hall": "facts"}},
	})
	require.NotNil(t, resp["error"])
	assert.Contains(t, resp["error"].(map[string]any)["message"].(string), "authenticated principal")
}

func TestCaptureToolCallerCannotForgeOrigin(t *testing.T) {
	// Body asserts sovereign harness, but the us-nexus JWT principal governs.
	srv, _ := captureServer(t, capFakeValidator{subject: "claudeai-oauth"}, nil)
	resp := captureCall(t, srv, "Bearer jwt", map[string]any{
		"context":  map[string]any{"harness": "sovereign-soil", "classification": "confidential"},
		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
	})
	require.NotNil(t, resp["error"])
	assert.Contains(t, resp["error"].(map[string]any)["message"].(string), "sovereignty")
}