package v1

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

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	"github.com/gochat/gochat/internal/service"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/suite"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

type CustomRoleHandlerTestSuite struct {
	suite.Suite
	db      *gorm.DB
	handler *CustomRoleHandler
	account *model.Account
}

func (s *CustomRoleHandlerTestSuite) SetupSuite() {
	gin.SetMode(gin.TestMode)
	db, err := gorm.Open(sqlite.Open("file::memory:"), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	s.Require().NoError(err)
	s.Require().NoError(db.AutoMigrate(&model.Account{}, &model.User{}, &model.AccountUser{}, &model.CustomRole{}, &model.Audit{}))
	s.db = db

	repo := repository.NewCustomRoleRepo(db)
	svc := service.NewCustomRoleService(repo)
	auditSvc := service.NewAuditService(repository.NewAuditRepo(db))
	s.handler = NewCustomRoleHandler(svc).WithAuditService(auditSvc)

	s.account = &model.Account{Name: "test-custom-role-account"}
	s.Require().NoError(db.Create(s.account).Error)
}

func (s *CustomRoleHandlerTestSuite) TearDownSuite() {
	if s.db != nil {
		sqlDB, _ := s.db.DB()
		sqlDB.Close()
	}
}

func TestCustomRoleHandlerSuite(t *testing.T) {
	suite.Run(t, new(CustomRoleHandlerTestSuite))
}

func (s *CustomRoleHandlerTestSuite) SetupTest() {
	s.Require().NoError(s.db.Exec("DELETE FROM audits").Error)
	s.Require().NoError(s.db.Exec("DELETE FROM account_users").Error)
	s.Require().NoError(s.db.Exec("DELETE FROM users").Error)
	s.Require().NoError(s.db.Exec("DELETE FROM custom_roles").Error)
}

func (s *CustomRoleHandlerTestSuite) TestList_Success() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/custom_roles", withCustomRoleAdminContext(s.account.ID, s.handler.List))
	s.Require().NoError(s.db.Create(&model.CustomRole{AccountID: s.account.ID, Name: "Supervisor", Permissions: `["conversation_manage"]`}).Error)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/custom_roles", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var payload []map[string]interface{}
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &payload))
	s.Require().Len(payload, 1)
	s.Equal("Supervisor", payload[0]["name"])
	s.NotContains(payload[0], "data")
	s.NotContains(payload[0], "success")
}

func (s *CustomRoleHandlerTestSuite) TestCreate_BadRequest_EmptyBody() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/custom_roles", withCustomRoleAdminContext(s.account.ID, s.handler.Create))

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/custom_roles", s.account.ID), nil)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *CustomRoleHandlerTestSuite) TestGet_BadRequest_InvalidID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/custom_roles/:id", withCustomRoleAdminContext(s.account.ID, s.handler.Get))

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/custom_roles/abc", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *CustomRoleHandlerTestSuite) TestUpdate_BadRequest_InvalidID() {
	r := gin.New()
	r.PUT("/api/v1/accounts/:account_id/custom_roles/:id", withCustomRoleAdminContext(s.account.ID, s.handler.Update))

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", fmt.Sprintf("/api/v1/accounts/%d/custom_roles/abc", s.account.ID), nil)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *CustomRoleHandlerTestSuite) TestDelete_BadRequest_InvalidID() {
	r := gin.New()
	r.DELETE("/api/v1/accounts/:account_id/custom_roles/:id", withCustomRoleAdminContext(s.account.ID, s.handler.Delete))

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", fmt.Sprintf("/api/v1/accounts/%d/custom_roles/abc", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *CustomRoleHandlerTestSuite) TestCreate_Success() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/custom_roles", func(c *gin.Context) {
		c.Set("account_id", uint(s.account.ID))
		c.Set("role", "administrator")
		s.handler.Create(c)
	})

	w := httptest.NewRecorder()
	body := `{"custom_role":{"name":"test-role","permissions":["conversation_manage","contact_manage"]}}`
	req, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/custom_roles", s.account.ID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var payload map[string]interface{}
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &payload))
	s.Equal("test-role", payload["name"])
	s.Equal([]interface{}{"conversation_manage", "contact_manage"}, payload["permissions"])
	s.NotContains(payload, "data")
}

func (s *CustomRoleHandlerTestSuite) TestGet_Success() {
	// Create a custom role first
	role := &model.CustomRole{AccountID: s.account.ID, Name: "get-test-role", Permissions: `["report_manage"]`}
	s.Require().NoError(s.db.Create(role).Error)

	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/custom_roles/:id", withCustomRoleAdminContext(s.account.ID, s.handler.Get))

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/custom_roles/%d", s.account.ID, role.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var payload map[string]interface{}
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &payload))
	s.Equal([]interface{}{"report_manage"}, payload["permissions"])
}

func (s *CustomRoleHandlerTestSuite) TestUpdate_Success() {
	role := &model.CustomRole{AccountID: s.account.ID, Name: "update-test-role", Description: "old description", Permissions: `["report_manage"]`}
	s.Require().NoError(s.db.Create(role).Error)

	r := gin.New()
	r.PATCH("/api/v1/accounts/:account_id/custom_roles/:id", func(c *gin.Context) {
		c.Set("account_id", uint(s.account.ID))
		c.Set("role", "administrator")
		s.handler.Update(c)
	})

	w := httptest.NewRecorder()
	body := `{"custom_role":{"name":"updated-role","description":"","permissions":["knowledge_base_manage"]}}`
	req, _ := http.NewRequest("PATCH", fmt.Sprintf("/api/v1/accounts/%d/custom_roles/%d", s.account.ID, role.ID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var payload map[string]interface{}
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &payload))
	s.Equal("updated-role", payload["name"])
	s.Equal("", payload["description"])
	s.Equal([]interface{}{"knowledge_base_manage"}, payload["permissions"])
}

func (s *CustomRoleHandlerTestSuite) TestDelete_Success() {
	role := &model.CustomRole{AccountID: s.account.ID, Name: "delete-test-role", Permissions: `["conversation_manage"]`}
	s.Require().NoError(s.db.Create(role).Error)
	user := &model.User{AccountID: s.account.ID, Name: "Role User", Email: "role-user@example.com", Password: "pw", Active: true}
	s.Require().NoError(s.db.Create(user).Error)
	s.Require().NoError(s.db.Create(&model.AccountUser{AccountID: s.account.ID, UserID: user.ID, Role: "agent", CustomRoleID: role.ID}).Error)

	r := gin.New()
	r.DELETE("/api/v1/accounts/:account_id/custom_roles/:id", func(c *gin.Context) {
		c.Set("account_id", uint(s.account.ID))
		c.Set("role", "administrator")
		s.handler.Delete(c)
	})

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", fmt.Sprintf("/api/v1/accounts/%d/custom_roles/%d", s.account.ID, role.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	s.Empty(w.Body.String())

	var au model.AccountUser
	s.Require().NoError(s.db.Where("account_id = ? AND user_id = ?", s.account.ID, user.ID).First(&au).Error)
	s.Equal(uint(0), au.CustomRoleID)
	s.Equal("agent", au.Role)
}

func (s *CustomRoleHandlerTestSuite) TestCreate_InvalidPermission() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/custom_roles", withCustomRoleAdminContext(s.account.ID, s.handler.Create))

	w := httptest.NewRecorder()
	body := `{"custom_role":{"name":"bad-role","permissions":["conversation_delete"]}}`
	req, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/custom_roles", s.account.ID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *CustomRoleHandlerTestSuite) TestList_NonAdminDenied() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/custom_roles", func(c *gin.Context) {
		c.Set("account_id", s.account.ID)
		c.Set("role", "agent")
		s.handler.List(c)
	})

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/custom_roles", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusUnauthorized, w.Code)
}

func (s *CustomRoleHandlerTestSuite) TestMutations_WriteAuditEntries() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/custom_roles", withCustomRoleAuditContext(s.account.ID, 77, s.handler.Create))
	r.PUT("/api/v1/accounts/:account_id/custom_roles/:id", withCustomRoleAuditContext(s.account.ID, 77, s.handler.Update))
	r.DELETE("/api/v1/accounts/:account_id/custom_roles/:id", withCustomRoleAuditContext(s.account.ID, 77, s.handler.Delete))

	createBody := `{"custom_role":{"name":"audit-role","permissions":["conversation_manage"]}}`
	createReq, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/custom_roles", s.account.ID), bytes.NewBufferString(createBody))
	createReq.Header.Set("Content-Type", "application/json")
	createReq.Header.Set("X-Request-ID", "audit-create-req")
	createReq.RemoteAddr = "203.0.113.20:1234"
	createW := httptest.NewRecorder()
	r.ServeHTTP(createW, createReq)
	s.Require().Equal(http.StatusOK, createW.Code)

	var createResp struct {
		ID uint `json:"id"`
	}
	s.Require().NoError(json.Unmarshal(createW.Body.Bytes(), &createResp))
	roleID := createResp.ID

	updateBody := `{"custom_role":{"name":"audit-role-updated","permissions":["contact_manage"]}}`
	updateReq, _ := http.NewRequest("PUT", fmt.Sprintf("/api/v1/accounts/%d/custom_roles/%d", s.account.ID, roleID), bytes.NewBufferString(updateBody))
	updateReq.Header.Set("Content-Type", "application/json")
	updateW := httptest.NewRecorder()
	r.ServeHTTP(updateW, updateReq)
	s.Require().Equal(http.StatusOK, updateW.Code)

	deleteReq, _ := http.NewRequest("DELETE", fmt.Sprintf("/api/v1/accounts/%d/custom_roles/%d", s.account.ID, roleID), nil)
	deleteW := httptest.NewRecorder()
	r.ServeHTTP(deleteW, deleteReq)
	s.Require().Equal(http.StatusOK, deleteW.Code)

	var audits []model.Audit
	s.Require().NoError(s.db.Order("id ASC").Find(&audits).Error)
	s.Require().Len(audits, 3)
	for _, audit := range audits {
		s.Equal(s.account.ID, *audit.AccountID)
		s.Equal("Account", audit.AssociatedType)
		s.Equal(s.account.ID, *audit.AssociatedID)
		s.Equal(uint(77), *audit.UserID)
		s.Equal("User", audit.UserType)
		s.Equal("CustomRole", audit.AuditableType)
		s.Equal(roleID, audit.AuditableID)
		s.NotEmpty(audit.AuditedChanges)
	}
	s.Equal("create", audits[0].Action)
	s.Equal("audit-create-req", audits[0].RequestUUID)
	s.Equal("update", audits[1].Action)
	s.Equal("destroy", audits[2].Action)
}

func withCustomRoleAuditContext(accountID uint, userID uint, h gin.HandlerFunc) gin.HandlerFunc {
	return func(c *gin.Context) {
		c.Set("account_id", accountID)
		c.Set("user_id", userID)
		c.Set("role", "administrator")
		h(c)
	}
}

func withCustomRoleAdminContext(accountID uint, h gin.HandlerFunc) gin.HandlerFunc {
	return func(c *gin.Context) {
		c.Set("account_id", accountID)
		c.Set("role", "administrator")
		h(c)
	}
}