package v1

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

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

type cannedDBProvider struct {
	db *gorm.DB
}

func (p *cannedDBProvider) DB() *gorm.DB { return p.db }

type CannedResponseHandlerTestSuite struct {
	suite.Suite
	db      *gorm.DB
	handler *CannedResponseHandler
	account *model.Account
}

func (s *CannedResponseHandlerTestSuite) 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{}, &canned.CannedResponse{}))
	s.db = db

	provider := &cannedDBProvider{db: db}
	svc := canned.NewCannedResponseService(provider)
	s.handler = NewCannedResponseHandler(svc)

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

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

func TestCannedResponseHandlerSuite(t *testing.T) {
	suite.Run(t, new(CannedResponseHandlerTestSuite))
}

func (s *CannedResponseHandlerTestSuite) SetupTest() {
	s.Require().NoError(s.db.Exec("DELETE FROM canned_responses").Error)
}

func (s *CannedResponseHandlerTestSuite) router() *gin.Engine {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/canned_responses", s.handler.List)
	r.GET("/api/v1/accounts/:account_id/canned_responses/", s.handler.List)
	r.POST("/api/v1/accounts/:account_id/canned_responses", s.handler.Create)
	r.POST("/api/v1/accounts/:account_id/canned_responses/", s.handler.Create)
	r.GET("/api/v1/accounts/:account_id/canned_responses/search", s.handler.Search)
	r.GET("/api/v1/accounts/:account_id/canned_responses/:id", s.handler.Get)
	r.PATCH("/api/v1/accounts/:account_id/canned_responses/:id", s.handler.Update)
	r.PUT("/api/v1/accounts/:account_id/canned_responses/:id", s.handler.Update)
	r.DELETE("/api/v1/accounts/:account_id/canned_responses/:id", s.handler.Delete)
	return r
}

func (s *CannedResponseHandlerTestSuite) seedCannedResponse(shortCode, content string) *canned.CannedResponse {
	cr := &canned.CannedResponse{AccountID: s.account.ID, ShortCode: shortCode, Content: content}
	s.Require().NoError(s.db.Create(cr).Error)
	return cr
}

func (s *CannedResponseHandlerTestSuite) TestList_BadRequest_InvalidAccountID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/canned_responses", s.handler.List)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/abc/canned_responses", nil)
	r.ServeHTTP(w, req)

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

func (s *CannedResponseHandlerTestSuite) TestList_Success() {
	s.seedCannedResponse("hello", "Hello there")
	r := s.router()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/canned_responses", 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)
	assert.Equal(s.T(), "hello", payload[0]["short_code"])
	assert.NotContains(s.T(), payload[0], "deleted_at")
}

func (s *CannedResponseHandlerTestSuite) TestList_SearchParamReturnsRawRankedArray() {
	s.seedCannedResponse("hey_start", "Generic content")
	s.seedCannedResponse("say_hey", "Generic content")
	s.seedCannedResponse("body_match", "Please say hey to the customer")
	r := s.router()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/canned_responses?search=hey", 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, 3)
	assert.Equal(s.T(), "hey_start", payload[0]["short_code"])
	assert.Equal(s.T(), "say_hey", payload[1]["short_code"])
	assert.Equal(s.T(), "body_match", payload[2]["short_code"])
}

func (s *CannedResponseHandlerTestSuite) TestCreate_RawFrontendBodyReturnsRawPayload() {
	r := s.router()

	w := httptest.NewRecorder()
	body := bytes.NewBufferString(`{"short_code":"welcome","content":"Welcome!"}`)
	req, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/canned_responses", s.account.ID), 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))
	assert.Equal(s.T(), "welcome", payload["short_code"])
	assert.Equal(s.T(), "Welcome!", payload["content"])
	assert.Equal(s.T(), float64(s.account.ID), payload["account_id"])
	assert.NotContains(s.T(), payload, "success")
	assert.NotContains(s.T(), payload, "data")
}

func (s *CannedResponseHandlerTestSuite) TestUpdate_PatchRawBodyIsAccountScoped() {
	cr := s.seedCannedResponse("old", "Old content")
	r := s.router()

	w := httptest.NewRecorder()
	body := bytes.NewBufferString(`{"short_code":"new","content":"New content"}`)
	req, _ := http.NewRequest("PATCH", fmt.Sprintf("/api/v1/accounts/%d/canned_responses/%d", s.account.ID, cr.ID), 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))
	assert.Equal(s.T(), "new", payload["short_code"])
	assert.Equal(s.T(), "New content", payload["content"])
}

func (s *CannedResponseHandlerTestSuite) TestUpdate_CrossAccountReturnsNotFound() {
	cr := s.seedCannedResponse("private", "Private content")
	otherAccount := &model.Account{Name: "other-canned-account"}
	s.Require().NoError(s.db.Create(otherAccount).Error)
	r := s.router()

	w := httptest.NewRecorder()
	body := bytes.NewBufferString(`{"content":"Nope"}`)
	req, _ := http.NewRequest("PATCH", fmt.Sprintf("/api/v1/accounts/%d/canned_responses/%d", otherAccount.ID, cr.ID), body)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

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

func (s *CannedResponseHandlerTestSuite) TestDelete_ReturnsOKEmptyAndScopesAccount() {
	cr := s.seedCannedResponse("delete_me", "Delete me")
	r := s.router()

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

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

func (s *CannedResponseHandlerTestSuite) TestDelete_CrossAccountReturnsNotFound() {
	cr := s.seedCannedResponse("private_delete", "Private content")
	otherAccount := &model.Account{Name: "other-delete-account"}
	s.Require().NoError(s.db.Create(otherAccount).Error)
	r := s.router()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", fmt.Sprintf("/api/v1/accounts/%d/canned_responses/%d", otherAccount.ID, cr.ID), nil)
	r.ServeHTTP(w, req)

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

func (s *CannedResponseHandlerTestSuite) TestCreate_BadRequest_EmptyBody() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/canned_responses", s.handler.Create)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/canned_responses", 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 *CannedResponseHandlerTestSuite) TestGet_BadRequest_InvalidID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/canned_responses/:id", s.handler.Get)

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

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

func (s *CannedResponseHandlerTestSuite) TestUpdate_BadRequest_InvalidID() {
	r := gin.New()
	r.PUT("/api/v1/accounts/:account_id/canned_responses/:id", s.handler.Update)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", fmt.Sprintf("/api/v1/accounts/%d/canned_responses/abc", s.account.ID), bytes.NewBufferString(`{"content":"updated"}`))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

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

func (s *CannedResponseHandlerTestSuite) TestDelete_BadRequest_InvalidID() {
	r := gin.New()
	r.DELETE("/api/v1/accounts/:account_id/canned_responses/:id", s.handler.Delete)

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

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

func (s *CannedResponseHandlerTestSuite) TestSearch_BadRequest_InvalidAccountID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/canned_responses/search", s.handler.Search)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/abc/canned_responses/search?q=test", nil)
	r.ServeHTTP(w, req)

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