package routers

import (
	"FamilyHub/src/api/services"
	"FamilyHub/src/domain"
	"bytes"
	"context"
	"database/sql"
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func int64Ptr(v int64) *int64 {
	return &v
}

func stringPtr(v string) *string {
	return &v
}

type familyServiceMock struct {
	createFn  func(ctx context.Context, req domain.CreateFamilyRequest) (*domain.Family, error)
	getByIDFn func(ctx context.Context, id int64) (*domain.Family, error)
	updateFn  func(ctx context.Context, id int64, req domain.UpdateFamilyRequest) (*domain.Family, error)
	deleteFn  func(ctx context.Context, id int64) error
}

func (m *familyServiceMock) Create(ctx context.Context, req domain.CreateFamilyRequest) (*domain.Family, error) {
	if m.createFn != nil {
		return m.createFn(ctx, req)
	}
	return nil, errors.New("mock create is not configured")
}

func (m *familyServiceMock) GetByID(ctx context.Context, id int64) (*domain.Family, error) {
	if m.getByIDFn != nil {
		return m.getByIDFn(ctx, id)
	}
	return nil, errors.New("mock getByID is not configured")
}

func (m *familyServiceMock) Update(ctx context.Context, id int64, req domain.UpdateFamilyRequest) (*domain.Family, error) {
	if m.updateFn != nil {
		return m.updateFn(ctx, id, req)
	}
	return nil, errors.New("mock update is not configured")
}

func (m *familyServiceMock) Delete(ctx context.Context, id int64) error {
	if m.deleteFn != nil {
		return m.deleteFn(ctx, id)
	}
	return errors.New("mock delete is not configured")
}

func setupFamiliesRouter(mock services.FamilyService) *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	apiV1 := r.Group("/api/v1")
	router := NewFamiliesRouter(mock)
	router.RegisterRoutes(apiV1)
	return r
}

func sampleFamily() *domain.Family {
	return &domain.Family{
		ID:               7,
		Name:             "Belan",
		OwnerID:          10,
		TelegramChatID:   int64Ptr(12345),
		TelegramChatName: stringPtr("Family Chat"),
		CreatedAt:        time.Date(2026, time.January, 21, 10, 0, 0, 0, time.UTC),
		UpdatedAt:        time.Date(2026, time.January, 21, 11, 0, 0, 0, time.UTC),
	}
}

func TestFamiliesRouter_Create(t *testing.T) {
	t.Run("bad request on malformed body", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{})
		req := httptest.NewRequest(http.MethodPost, "/api/v1/families", bytes.NewBufferString(`{"name":`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusBadRequest, w.Code)
		assert.Contains(t, w.Body.String(), "message")
	})

	t.Run("internal error", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{createFn: func(ctx context.Context, req domain.CreateFamilyRequest) (*domain.Family, error) {
			return nil, errors.New("db unavailable")
		}})
		req := httptest.NewRequest(http.MethodPost, "/api/v1/families", bytes.NewBufferString(`{"name":"Belan","owner_id":10,"telegram_chat_id":12345,"telegram_chat_name":"Family Chat"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusInternalServerError, w.Code)
		assert.Contains(t, w.Body.String(), "internal server error")
	})

	t.Run("created", func(t *testing.T) {
		expected := sampleFamily()
		r := setupFamiliesRouter(&familyServiceMock{createFn: func(ctx context.Context, req domain.CreateFamilyRequest) (*domain.Family, error) {
			assert.Equal(t, "Belan", req.Name)
			assert.Nil(t, req.TelegramChatID)
			assert.Nil(t, req.TelegramChatName)
			return expected, nil
		}})
		req := httptest.NewRequest(http.MethodPost, "/api/v1/families", bytes.NewBufferString(`{"name":"Belan","owner_id":10}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusCreated, w.Code)
		assert.Contains(t, w.Body.String(), "Belan")
	})
}

func TestFamiliesRouter_GetByID(t *testing.T) {
	t.Run("bad request on invalid id", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{})
		req := httptest.NewRequest(http.MethodGet, "/api/v1/families/abc", nil)
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusBadRequest, w.Code)
		assert.Contains(t, w.Body.String(), "invalid id")
	})

	t.Run("not found on service error", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{getByIDFn: func(ctx context.Context, id int64) (*domain.Family, error) {
			return nil, services.ErrFamilyNotFound
		}})
		req := httptest.NewRequest(http.MethodGet, "/api/v1/families/7", nil)
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusNotFound, w.Code)
		assert.Contains(t, w.Body.String(), services.ErrFamilyNotFound.Error())
	})

	t.Run("not found on sql no rows", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{getByIDFn: func(ctx context.Context, id int64) (*domain.Family, error) {
			return nil, sql.ErrNoRows
		}})
		req := httptest.NewRequest(http.MethodGet, "/api/v1/families/7", nil)
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusNotFound, w.Code)
		assert.Contains(t, w.Body.String(), "family not found")
	})

	t.Run("ok", func(t *testing.T) {
		expected := sampleFamily()
		r := setupFamiliesRouter(&familyServiceMock{getByIDFn: func(ctx context.Context, id int64) (*domain.Family, error) {
			assert.Equal(t, int64(7), id)
			return expected, nil
		}})
		req := httptest.NewRequest(http.MethodGet, "/api/v1/families/7", nil)
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusOK, w.Code)
		assert.Contains(t, w.Body.String(), "Belan")
	})
}

func TestFamiliesRouter_Update(t *testing.T) {
	t.Run("bad request on invalid id", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{})
		req := httptest.NewRequest(http.MethodPatch, "/api/v1/families/abc", bytes.NewBufferString(`{"name":"Belan"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusBadRequest, w.Code)
		assert.Contains(t, w.Body.String(), "invalid id")
	})

	t.Run("bad request on malformed body", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{})
		req := httptest.NewRequest(http.MethodPatch, "/api/v1/families/7", bytes.NewBufferString(`{"name":`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusBadRequest, w.Code)
		assert.Contains(t, w.Body.String(), "message")
	})

	t.Run("bad request on missing name", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{})
		req := httptest.NewRequest(http.MethodPatch, "/api/v1/families/7", bytes.NewBufferString(`{"telegram_chat_name":"Updated"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusBadRequest, w.Code)
		assert.Contains(t, w.Body.String(), "name is required")
	})

	t.Run("not found", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{updateFn: func(ctx context.Context, id int64, req domain.UpdateFamilyRequest) (*domain.Family, error) {
			return nil, services.ErrFamilyNotFound
		}})
		name := "Belan Updated"
		req := httptest.NewRequest(http.MethodPatch, "/api/v1/families/7", bytes.NewBufferString(`{"name":"`+name+`","telegram_chat_name":"Updated"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusNotFound, w.Code)
		assert.Contains(t, w.Body.String(), services.ErrFamilyNotFound.Error())
	})

	t.Run("ok", func(t *testing.T) {
		expected := sampleFamily()
		updatedName := "Belan Updated"
		expected.Name = updatedName
		r := setupFamiliesRouter(&familyServiceMock{updateFn: func(ctx context.Context, id int64, req domain.UpdateFamilyRequest) (*domain.Family, error) {
			assert.Equal(t, int64(7), id)
			require.NotNil(t, req.Name)
			assert.Equal(t, updatedName, *req.Name)
			require.NotNil(t, req.TelegramChatName)
			assert.Equal(t, "Updated", *req.TelegramChatName)
			return expected, nil
		}})
		req := httptest.NewRequest(http.MethodPatch, "/api/v1/families/7", bytes.NewBufferString(`{"name":"`+updatedName+`","telegram_chat_name":"Updated"}`))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusOK, w.Code)
		assert.Contains(t, w.Body.String(), updatedName)
	})
}

func TestFamiliesRouter_Delete(t *testing.T) {
	t.Run("bad request on invalid id", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{})
		req := httptest.NewRequest(http.MethodDelete, "/api/v1/families/abc", nil)
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusBadRequest, w.Code)
		assert.Contains(t, w.Body.String(), "invalid id")
	})

	t.Run("not found", func(t *testing.T) {
		r := setupFamiliesRouter(&familyServiceMock{deleteFn: func(ctx context.Context, id int64) error {
			return sql.ErrNoRows
		}})
		req := httptest.NewRequest(http.MethodDelete, "/api/v1/families/7", nil)
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusNotFound, w.Code)
		assert.Contains(t, w.Body.String(), "family not found")
	})

	t.Run("no content", func(t *testing.T) {
		called := false
		r := setupFamiliesRouter(&familyServiceMock{deleteFn: func(ctx context.Context, id int64) error {
			called = true
			assert.Equal(t, int64(7), id)
			return nil
		}})
		req := httptest.NewRequest(http.MethodDelete, "/api/v1/families/7", nil)
		w := httptest.NewRecorder()

		r.ServeHTTP(w, req)

		require.Equal(t, http.StatusNoContent, w.Code)
		assert.True(t, called)
		assert.Empty(t, strings.TrimSpace(w.Body.String()))
	})
}

func TestFamiliesRouter_Create_ResponseShape(t *testing.T) {
	expected := sampleFamily()
	r := setupFamiliesRouter(&familyServiceMock{createFn: func(ctx context.Context, req domain.CreateFamilyRequest) (*domain.Family, error) {
		return expected, nil
	}})

	req := httptest.NewRequest(http.MethodPost, "/api/v1/families", bytes.NewBufferString(`{"name":"Belan","owner_id":10,"telegram_chat_id":12345,"telegram_chat_name":"Family Chat"}`))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)

	require.Equal(t, http.StatusCreated, w.Code)
	var resp domain.FamilyResponse
	err := json.Unmarshal(w.Body.Bytes(), &resp)
	require.NoError(t, err)
	assert.Equal(t, expected.ID, resp.ID)
	assert.Equal(t, expected.Name, resp.Name)
	assert.Equal(t, expected.OwnerID, resp.OwnerID)
	assert.Equal(t, expected.TelegramChatID, resp.TelegramChatID)
	assert.Equal(t, expected.TelegramChatName, resp.TelegramChatName)
	assert.Equal(t, expected.CreatedAt.Format(time.RFC3339), resp.CreatedAt)
	assert.Equal(t, expected.UpdatedAt.Format(time.RFC3339), resp.UpdatedAt)
}