package v1

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strconv"
	"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/require"
	"gorm.io/datatypes"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

type captainPreferenceFixture struct {
	db      *gorm.DB
	router  *gin.Engine
	account *model.Account
}

func newCaptainPreferenceFixture(t *testing.T) *captainPreferenceFixture {
	t.Helper()
	gin.SetMode(gin.TestMode)
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
	require.NoError(t, err)
	require.NoError(t, db.AutoMigrate(&model.Account{}, &model.CaptainPreference{}))

	account := &model.Account{Name: "Captain Preferences", Active: true, CaptainModels: datatypes.JSON(`{}`), CaptainFeatures: datatypes.JSON(`{}`)}
	require.NoError(t, db.Create(account).Error)

	prefRepo := repository.NewCaptainPreferenceRepo(db)
	accountRepo := repository.NewAccountRepo(db)
	handler := NewCaptainPreferenceHandler(service.NewCaptainPreferenceService(prefRepo, accountRepo))
	router := gin.New()
	router.GET("/api/v1/accounts/:account_id/captain/preferences", handler.Get)
	router.PUT("/api/v1/accounts/:account_id/captain/preferences", func(c *gin.Context) {
		c.Set("role", "administrator")
		handler.Update(c)
	})
	router.PUT("/api/v1/accounts/:account_id/captain/preferences/as-agent", func(c *gin.Context) {
		c.Set("role", "agent")
		handler.Update(c)
	})

	t.Cleanup(func() {
		sqlDB, dbErr := db.DB()
		require.NoError(t, dbErr)
		require.NoError(t, sqlDB.Close())
	})
	return &captainPreferenceFixture{db: db, router: router, account: account}
}

func (f *captainPreferenceFixture) path(suffix string) string {
	return "/api/v1/accounts/" + strconv.FormatUint(uint64(f.account.ID), 10) + "/captain/preferences" + suffix
}

func (f *captainPreferenceFixture) request(method, path string, body any) *httptest.ResponseRecorder {
	var raw []byte
	if body != nil {
		raw, _ = json.Marshal(body)
	}
	recorder := httptest.NewRecorder()
	req, _ := http.NewRequest(method, path, bytes.NewReader(raw))
	if body != nil {
		req.Header.Set("Content-Type", "application/json")
	}
	f.router.ServeHTTP(recorder, req)
	return recorder
}

func decodeCaptainPreferencePayload(t *testing.T, recorder *httptest.ResponseRecorder) map[string]any {
	t.Helper()
	var payload map[string]any
	require.NoError(t, json.Unmarshal(recorder.Body.Bytes(), &payload))
	return payload
}

func TestCaptainPreferencesGetReturnsRawChatwootConfig(t *testing.T) {
	f := newCaptainPreferenceFixture(t)

	w := f.request(http.MethodGet, f.path(""), nil)
	require.Equal(t, http.StatusOK, w.Code, w.Body.String())
	payload := decodeCaptainPreferencePayload(t, w)
	require.Nil(t, payload["success"])
	require.Contains(t, payload, "providers")
	require.Contains(t, payload, "models")
	require.Contains(t, payload, "features")

	features := payload["features"].(map[string]any)
	editor := features["editor"].(map[string]any)
	require.Equal(t, false, editor["enabled"])
	require.Equal(t, "gpt-4.1-mini", editor["default"])
	require.Equal(t, "gpt-4.1-mini", editor["selected"])
	require.NotEmpty(t, editor["models"].([]any))
}

func TestCaptainPreferencesUpdateMergesAccountModelsAndFeatures(t *testing.T) {
	f := newCaptainPreferenceFixture(t)
	require.NoError(t, f.db.Model(&model.Account{}).Where("id = ?", f.account.ID).Updates(map[string]any{
		"captain_models":   datatypes.JSON(`{"editor":"gpt-4.1-mini","assistant":"gpt-5.1"}`),
		"captain_features": datatypes.JSON(`{"editor":true,"assistant":false}`),
	}).Error)

	w := f.request(http.MethodPut, f.path(""), map[string]any{
		"captain_models":   map[string]any{"editor": "gpt-4.1"},
		"captain_features": map[string]any{"editor": false},
	})
	require.Equal(t, http.StatusOK, w.Code, w.Body.String())
	payload := decodeCaptainPreferencePayload(t, w)
	features := payload["features"].(map[string]any)
	require.Equal(t, "gpt-4.1", features["editor"].(map[string]any)["selected"])
	require.Equal(t, false, features["editor"].(map[string]any)["enabled"])
	require.Equal(t, "gpt-5.1", features["assistant"].(map[string]any)["selected"])
	require.Equal(t, false, features["assistant"].(map[string]any)["enabled"])

	var account model.Account
	require.NoError(t, f.db.First(&account, f.account.ID).Error)
	var models map[string]string
	var featureValues map[string]bool
	require.NoError(t, json.Unmarshal(account.CaptainModels, &models))
	require.NoError(t, json.Unmarshal(account.CaptainFeatures, &featureValues))
	require.Equal(t, "gpt-4.1", models["editor"])
	require.Equal(t, "gpt-5.1", models["assistant"])
	require.False(t, featureValues["editor"])
	require.False(t, featureValues["assistant"])
}

func TestCaptainPreferencesUpdateRejectsNonAdminAndInvalidModel(t *testing.T) {
	f := newCaptainPreferenceFixture(t)

	w := f.request(http.MethodPut, f.path("/as-agent"), map[string]any{"captain_models": map[string]any{"editor": "gpt-4.1"}})
	require.Equal(t, http.StatusUnauthorized, w.Code, w.Body.String())

	w = f.request(http.MethodPut, f.path(""), map[string]any{"captain_models": map[string]any{"editor": "not-a-model"}})
	require.Equal(t, http.StatusUnprocessableEntity, w.Code, w.Body.String())
	require.Contains(t, decodeCaptainPreferencePayload(t, w)["error"], "not a valid model")
}

func TestCaptainPreferencesInvalidAccountID(t *testing.T) {
	f := newCaptainPreferenceFixture(t)

	w := f.request(http.MethodGet, "/api/v1/accounts/abc/captain/preferences", nil)
	require.Equal(t, http.StatusBadRequest, w.Code, w.Body.String())
}