package service

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"git.umbrella.haus/ae/notatest/pkg/data"
	"github.com/go-chi/chi/v5"
	"github.com/golang-jwt/jwt/v5"
	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
)

type mockNoteStore struct {
	CreateNoteFunc           func(context.Context, uuid.UUID) (data.Note, error)
	DeleteNoteFunc           func(context.Context, data.DeleteNoteParams) error
	GetNoteFunc              func(context.Context, data.GetNoteParams) (data.Note, error)
	ListNotesFunc            func(context.Context, data.ListNotesParams) ([]data.Note, error)
	CreateNoteVersionFunc    func(context.Context, data.CreateNoteVersionParams) (data.NoteVersion, error)
	FindDuplicateContentFunc func(context.Context, data.FindDuplicateContentParams) (bool, error)
	GetNoteVersionFunc       func(context.Context, data.GetNoteVersionParams) (data.NoteVersion, error)
	GetNoteVersionsFunc      func(context.Context, data.GetNoteVersionsParams) ([]data.NoteVersion, error)
}

func (m *mockNoteStore) CreateNote(ctx context.Context, userID uuid.UUID) (data.Note, error) {
	return m.CreateNoteFunc(ctx, userID)
}

func (m *mockNoteStore) DeleteNote(ctx context.Context, arg data.DeleteNoteParams) error {
	return m.DeleteNoteFunc(ctx, arg)
}

func (m *mockNoteStore) GetNote(ctx context.Context, arg data.GetNoteParams) (data.Note, error) {
	return m.GetNoteFunc(ctx, arg)
}

func (m *mockNoteStore) ListNotes(ctx context.Context, arg data.ListNotesParams) ([]data.Note, error) {
	return m.ListNotesFunc(ctx, arg)
}

func (m *mockNoteStore) CreateNoteVersion(ctx context.Context, arg data.CreateNoteVersionParams) (data.NoteVersion, error) {
	return m.CreateNoteVersionFunc(ctx, arg)
}

func (m *mockNoteStore) FindDuplicateContent(ctx context.Context, arg data.FindDuplicateContentParams) (bool, error) {
	return m.FindDuplicateContentFunc(ctx, arg)
}

func (m *mockNoteStore) GetNoteVersion(ctx context.Context, arg data.GetNoteVersionParams) (data.NoteVersion, error) {
	return m.GetNoteVersionFunc(ctx, arg)
}

func (m *mockNoteStore) GetNoteVersions(ctx context.Context, arg data.GetNoteVersionsParams) ([]data.NoteVersion, error) {
	return m.GetNoteVersionsFunc(ctx, arg)
}

func TestNotes_CreateNote(t *testing.T) {
	userID := uuid.New()
	testNote := data.Note{ID: uuid.New(), UserID: userID}

	tests := []struct {
		name       string
		mock       func(*mockNoteStore)
		statusCode int
	}{
		{
			"success",
			func(m *mockNoteStore) {
				m.CreateNoteFunc = func(_ context.Context, uid uuid.UUID) (data.Note, error) {
					assert.Equal(t, userID, uid)
					return testNote, nil
				}
			},
			http.StatusCreated,
		},
		{
			"database error",
			func(m *mockNoteStore) {
				m.CreateNoteFunc = func(context.Context, uuid.UUID) (data.Note, error) {
					return data.Note{}, errors.New("db error")
				}
			},
			http.StatusInternalServerError,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			mockStore := &mockNoteStore{}
			tc.mock(mockStore)

			rs := notesResource{Notes: mockStore}
			req := httptest.NewRequest("POST", "/", nil)
			req = req.WithContext(context.WithValue(
				req.Context(),
				userCtxKey{},
				&userClaims{RegisteredClaims: jwt.RegisteredClaims{
					Subject: userID.String(),
				}},
			))

			w := httptest.NewRecorder()
			rs.CreateNote(w, req)

			assert.Equal(t, tc.statusCode, w.Code)
			if tc.statusCode == http.StatusCreated {
				var note data.Note
				json.Unmarshal(w.Body.Bytes(), &note)
				assert.Equal(t, testNote.ID, note.ID)
			}
		})
	}
}

func TestNotes_ListNotes(t *testing.T) {
	userID := uuid.New()
	notes := []data.Note{
		{ID: uuid.New(), UserID: userID},
		{ID: uuid.New(), UserID: userID},
	}

	tests := []struct {
		name       string
		query      string
		mock       func(*mockNoteStore)
		statusCode int
	}{
		{
			"success",
			"",
			func(m *mockNoteStore) {
				m.ListNotesFunc = func(_ context.Context, arg data.ListNotesParams) ([]data.Note, error) {
					assert.Equal(t, userID, arg.UserID)
					return notes, nil
				}
			},
			http.StatusOK,
		},
		{
			"with pagination",
			"?limit=10&offset=20",
			func(m *mockNoteStore) {
				m.ListNotesFunc = func(_ context.Context, arg data.ListNotesParams) ([]data.Note, error) {
					assert.EqualValues(t, 10, arg.Limit)
					assert.EqualValues(t, 20, arg.Offset)
					return notes, nil
				}
			},
			http.StatusOK,
		},
		{
			"database error",
			"",
			func(m *mockNoteStore) {
				m.ListNotesFunc = func(context.Context, data.ListNotesParams) ([]data.Note, error) {
					return nil, errors.New("db error")
				}
			},
			http.StatusInternalServerError,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			mockStore := &mockNoteStore{}
			tc.mock(mockStore)

			rs := notesResource{Notes: mockStore}
			req := httptest.NewRequest("GET", fmt.Sprintf("/%s", tc.query), nil)
			req = req.WithContext(context.WithValue(
				req.Context(),
				userCtxKey{},
				&userClaims{RegisteredClaims: jwt.RegisteredClaims{
					Subject: userID.String(),
				}},
			))

			w := httptest.NewRecorder()
			rs.ListNotes(w, req)

			assert.Equal(t, tc.statusCode, w.Code)
		})
	}
}

func TestNotes_GetNote(t *testing.T) {
	noteID := uuid.New()
	userID := uuid.New()
	validNote := data.Note{ID: noteID, UserID: userID}

	t.Run("success", func(t *testing.T) {
		rs := notesResource{}
		req := httptest.NewRequest("GET", "/", nil)
		req = req.WithContext(context.WithValue(
			req.Context(),
			noteCtxKey{},
			validNote,
		))

		w := httptest.NewRecorder()
		rs.GetNote(w, req)

		assert.Equal(t, http.StatusOK, w.Code)
		var note data.Note
		json.Unmarshal(w.Body.Bytes(), &note)
		assert.Equal(t, validNote.ID, note.ID)
	})

	t.Run("not found", func(t *testing.T) {
		rs := notesResource{}
		req := httptest.NewRequest("GET", "/", nil)
		w := httptest.NewRecorder()
		rs.GetNote(w, req)

		assert.Equal(t, http.StatusNotFound, w.Code)
	})
}

func TestNotes_DeleteNote(t *testing.T) {
	noteID := uuid.New()
	userID := uuid.New()
	validNote := data.Note{ID: noteID, UserID: userID}

	t.Run("success", func(t *testing.T) {
		mockStore := &mockNoteStore{
			DeleteNoteFunc: func(_ context.Context, arg data.DeleteNoteParams) error {
				assert.Equal(t, noteID, arg.ID)
				assert.Equal(t, userID, arg.UserID)
				return nil
			},
		}

		rs := notesResource{Notes: mockStore}
		req := httptest.NewRequest("DELETE", "/", nil)
		req = req.WithContext(context.WithValue(
			req.Context(),
			noteCtxKey{},
			validNote,
		))
		req = req.WithContext(context.WithValue(
			req.Context(),
			userCtxKey{},
			&userClaims{RegisteredClaims: jwt.RegisteredClaims{
				Subject: userID.String(),
			}},
		))

		w := httptest.NewRecorder()
		rs.DeleteNote(w, req)

		assert.Equal(t, http.StatusNoContent, w.Code)
	})

	t.Run("database error", func(t *testing.T) {
		mockStore := &mockNoteStore{
			DeleteNoteFunc: func(context.Context, data.DeleteNoteParams) error {
				return errors.New("db error")
			},
		}

		rs := notesResource{Notes: mockStore}
		req := httptest.NewRequest("DELETE", "/", nil)
		req = req.WithContext(context.WithValue(
			req.Context(),
			noteCtxKey{},
			validNote,
		))
		req = req.WithContext(context.WithValue(
			req.Context(),
			userCtxKey{},
			&userClaims{RegisteredClaims: jwt.RegisteredClaims{
				Subject: userID.String(),
			}},
		))

		w := httptest.NewRecorder()
		rs.DeleteNote(w, req)

		assert.Equal(t, http.StatusInternalServerError, w.Code)
	})
}

func TestNotes_CreateNoteVersion(t *testing.T) {
	noteID := uuid.New()
	validRequest := `{"title": "Test", "content": "Content"}`

	tests := []struct {
		name       string
		body       string
		mock       func(*mockNoteStore)
		statusCode int
	}{
		{
			"success",
			validRequest,
			func(m *mockNoteStore) {
				m.FindDuplicateContentFunc = func(context.Context, data.FindDuplicateContentParams) (bool, error) {
					return false, nil
				}
				m.CreateNoteVersionFunc = func(_ context.Context, arg data.CreateNoteVersionParams) (data.NoteVersion, error) {
					assert.Equal(t, noteID, arg.NoteID)
					return data.NoteVersion{}, nil
				}
			},
			http.StatusCreated,
		},
		{
			"duplicate content",
			validRequest,
			func(m *mockNoteStore) {
				m.FindDuplicateContentFunc = func(context.Context, data.FindDuplicateContentParams) (bool, error) {
					return true, nil
				}
			},
			http.StatusConflict,
		},
		{
			"invalid request",
			"{invalid}",
			func(m *mockNoteStore) {},
			http.StatusBadRequest,
		},
		{
			"database error",
			validRequest,
			func(m *mockNoteStore) {
				m.FindDuplicateContentFunc = func(context.Context, data.FindDuplicateContentParams) (bool, error) {
					return false, nil
				}
				m.CreateNoteVersionFunc = func(context.Context, data.CreateNoteVersionParams) (data.NoteVersion, error) {
					return data.NoteVersion{}, errors.New("db error")
				}
			},
			http.StatusInternalServerError,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			mockStore := &mockNoteStore{}
			tc.mock(mockStore)

			rs := notesResource{Notes: mockStore}
			req := httptest.NewRequest("POST", "/", strings.NewReader(tc.body))
			req = req.WithContext(context.WithValue(
				req.Context(),
				noteCtxKey{},
				data.Note{ID: noteID},
			))

			w := httptest.NewRecorder()
			rs.CreateNoteVersion(w, req)

			assert.Equal(t, tc.statusCode, w.Code)
		})
	}
}

func TestNotes_ListNoteVersions(t *testing.T) {
	noteID := uuid.New()
	versions := []data.NoteVersion{
		{ID: uuid.New(), NoteID: noteID, VersionNumber: 1},
		{ID: uuid.New(), NoteID: noteID, VersionNumber: 2},
	}

	tests := []struct {
		name       string
		query      string
		mock       func(*mockNoteStore)
		statusCode int
	}{
		{
			"success",
			"",
			func(m *mockNoteStore) {
				m.GetNoteVersionsFunc = func(_ context.Context, arg data.GetNoteVersionsParams) ([]data.NoteVersion, error) {
					assert.Equal(t, noteID, arg.NoteID)
					return versions, nil
				}
			},
			http.StatusOK,
		},
		{
			"with pagination",
			"?limit=5&offset=10",
			func(m *mockNoteStore) {
				m.GetNoteVersionsFunc = func(_ context.Context, arg data.GetNoteVersionsParams) ([]data.NoteVersion, error) {
					assert.EqualValues(t, 5, arg.Limit)
					assert.EqualValues(t, 10, arg.Offset)
					return versions, nil
				}
			},
			http.StatusOK,
		},
		{
			"database error",
			"",
			func(m *mockNoteStore) {
				m.GetNoteVersionsFunc = func(context.Context, data.GetNoteVersionsParams) ([]data.NoteVersion, error) {
					return nil, errors.New("db error")
				}
			},
			http.StatusInternalServerError,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			mockStore := &mockNoteStore{}
			tc.mock(mockStore)

			rs := notesResource{Notes: mockStore}
			req := httptest.NewRequest("GET", fmt.Sprintf("/versions/%s", tc.query), nil)
			req = req.WithContext(context.WithValue(
				req.Context(),
				noteCtxKey{},
				data.Note{ID: noteID},
			))

			w := httptest.NewRecorder()
			rs.ListNoteVersions(w, req)

			assert.Equal(t, tc.statusCode, w.Code)
			if tc.statusCode == http.StatusOK {
				var result []data.NoteVersion
				json.Unmarshal(w.Body.Bytes(), &result)
				assert.Len(t, result, 2)
			}
		})
	}
}

func TestNotes_GetNoteVersion(t *testing.T) {
	noteID := uuid.New()
	version := data.NoteVersion{ID: uuid.New(), NoteID: noteID, VersionNumber: 1}

	tests := []struct {
		name       string
		version    string
		mock       func(*mockNoteStore)
		statusCode int
	}{
		{
			"invalid version",
			"invalid",
			func(m *mockNoteStore) {},
			http.StatusBadRequest,
		},
		{
			"version not found",
			"1",
			func(m *mockNoteStore) {
				m.GetNoteVersionFunc = func(context.Context, data.GetNoteVersionParams) (data.NoteVersion, error) {
					return data.NoteVersion{}, errors.New("not found")
				}
			},
			http.StatusNotFound,
		},
		{
			"success",
			"1",
			func(m *mockNoteStore) {
				m.GetNoteVersionFunc = func(_ context.Context, arg data.GetNoteVersionParams) (data.NoteVersion, error) {
					assert.Equal(t, noteID, arg.NoteID)
					assert.EqualValues(t, 1, arg.VersionNumber)
					return version, nil
				}
			},
			http.StatusOK,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			mockStore := &mockNoteStore{}
			tc.mock(mockStore)

			rs := notesResource{Notes: mockStore}

			req := httptest.NewRequest("GET", fmt.Sprintf("/versions/%s", tc.version), nil)

			// Chi router context mocks ID (passed in a URL param.) and the note object (passed in req. ctx.)
			rctx := chi.NewRouteContext()
			rctx.URLParams.Add("version", tc.version)
			req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
			req = req.WithContext(context.WithValue(
				req.Context(),
				noteCtxKey{},
				data.Note{ID: noteID},
			))

			w := httptest.NewRecorder()
			rs.GetNoteVersion(w, req)

			assert.Equal(t, tc.statusCode, w.Code)
			if tc.statusCode == http.StatusOK {
				var result data.NoteVersion
				json.Unmarshal(w.Body.Bytes(), &result)
				assert.Equal(t, version.VersionNumber, result.VersionNumber)
			}
		})
	}
}