//
//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

package handler

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

	"github.com/glebarez/sqlite"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"

	"ragflow/internal/common"
	"ragflow/internal/dao"
	"ragflow/internal/entity"
	"ragflow/internal/service"
)

// setupHandlerAgentsTestDB sets up SQLite in-memory DB with tables needed for agent handler tests.
func setupHandlerAgentsTestDB(t *testing.T) *gorm.DB {
	t.Helper()

	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{
		TranslateError: true,
	})
	if err != nil {
		t.Fatalf("failed to open sqlite: %v", err)
	}

	if err := db.AutoMigrate(
		&entity.User{},
		&entity.UserCanvas{},
		&entity.UserCanvasVersion{},
	); err != nil {
		t.Fatalf("failed to migrate: %v", err)
	}

	return db
}

// setupGinContextWithUserAndDB creates a gin context with pre-authenticated user
// and swaps dao.DB to the test database. Returns cleanup function.
func setupGinContextWithUserAndDB(t *testing.T, method, path string) (*gin.Context, *httptest.ResponseRecorder, *gorm.DB) {
	t.Helper()
	gin.SetMode(gin.TestMode)
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(method, path, nil)
	c.Set("user", &entity.User{ID: "user-1"})
	c.Set("user_id", "user-1")

	db := setupHandlerAgentsTestDB(t)
	orig := dao.DB
	dao.DB = db
	t.Cleanup(func() { dao.DB = orig })

	return c, w, db
}

// draw a box with a slot for the old TestListAgents test.
// TestListAgents_Success verifies the ListAgents handler returns a valid response.

// TestListAgentVersionsHandler_Success verifies the happy path with real DB.
func TestListAgentVersionsHandler_Success(t *testing.T) {
	c, w, db := setupGinContextWithUserAndDB(t, "GET", "/api/v1/agents/canvas-1/versions")
	c.Params = gin.Params{{Key: "agent_id", Value: "canvas-1"}}

	// Insert canvas owned by user-1
	db.Create(&entity.UserCanvas{
		ID:     "canvas-1",
		UserID: "user-1",
		Title:  sptr("Test Agent"),
	})

	// Insert 2 versions with staggered timestamps
	now := time.Now()
	db.Create(&entity.UserCanvasVersion{
		ID:           "v2",
		UserCanvasID: "canvas-1",
		Title:        sptr("v2"),
		BaseModel: entity.BaseModel{
			UpdateTime: ptr(now.UnixMilli()),
		},
	})
	db.Create(&entity.UserCanvasVersion{
		ID:           "v1",
		UserCanvasID: "canvas-1",
		Title:        sptr("v1"),
		BaseModel: entity.BaseModel{
			UpdateTime: ptr(now.Add(-time.Hour).UnixMilli()),
		},
	})

	h := NewAgentHandler(service.NewAgentService(), nil)
	h.ListAgentVersions(c)

	if w.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
	}

	var resp map[string]interface{}
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("failed to parse response: %v", err)
	}

	code, _ := resp["code"].(float64)
	if code != float64(common.CodeSuccess) {
		t.Fatalf("expected code 0, got %v: %v", code, resp["message"])
	}

	data, ok := resp["data"].([]interface{})
	if !ok {
		t.Fatalf("expected data array, got %T", resp["data"])
	}
	if len(data) != 2 {
		t.Fatalf("expected 2 versions, got %d", len(data))
	}

	v2 := data[0].(map[string]interface{})
	if v2["title"] != "v2" {
		t.Errorf("expected v2 first, got %s", v2["title"])
	}
}

// TestListAgentVersionsHandler_NoPermission verifies cross-user access is denied.
func TestListAgentVersionsHandler_NoPermission(t *testing.T) {
	gin.SetMode(gin.TestMode)

	db := setupHandlerAgentsTestDB(t)
	orig := dao.DB
	dao.DB = db
	t.Cleanup(func() { dao.DB = orig })

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest("GET", "/api/v1/agents/canvas-b/versions", nil)
	c.Set("user", &entity.User{ID: "user-a"})
	c.Set("user_id", "user-a")
	c.Params = gin.Params{{Key: "agent_id", Value: "canvas-b"}}

	// Canvas owned by user-b
	db.Create(&entity.UserCanvas{ID: "canvas-b", UserID: "user-b", Title: sptr("Not Yours")})

	h := NewAgentHandler(service.NewAgentService(), nil)
	h.ListAgentVersions(c)

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	code, _ := resp["code"].(float64)
	if code != float64(common.CodeOperatingError) {
		t.Errorf("expected operating error code %d, got %v", common.CodeOperatingError, code)
	}
}

// TestListAgentVersionsHandler_CanvasNotFound verifies behavior for non-existent canvas.
func TestListAgentVersionsHandler_CanvasNotFound(t *testing.T) {
	gin.SetMode(gin.TestMode)

	db := setupHandlerAgentsTestDB(t)
	orig := dao.DB
	dao.DB = db
	t.Cleanup(func() { dao.DB = orig })

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest("GET", "/api/v1/agents/non-existent/versions", nil)
	c.Set("user", &entity.User{ID: "user-1"})
	c.Set("user_id", "user-1")
	c.Params = gin.Params{{Key: "agent_id", Value: "non-existent"}}

	h := NewAgentHandler(service.NewAgentService(), nil)
	h.ListAgentVersions(c)

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	code, _ := resp["code"].(float64)
	if code != float64(common.CodeOperatingError) {
		t.Errorf("expected operating error code %d, got %v", common.CodeOperatingError, code)
	}
}
// sptr returns a pointer to the given string.
// ptr returns a pointer to the given int64.
func ptr(v int64) *int64 { return &v }