/*
Copyright © The ESO Authors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package fake

import (
	"errors"
	"net/http"

	gitlab "gitlab.com/gitlab-org/api/client-go"
)

type APIResponse[O any] struct {
	Output   O
	Response *gitlab.Response
	Error    error
}

type GitVariable interface {
	gitlab.ProjectVariable |
		gitlab.GroupVariable
}

type extractKey[V GitVariable] func(gv V) string

func keyFromProjectVariable(pv gitlab.ProjectVariable) string {
	return pv.Key
}

func keyFromGroupVariable(gv gitlab.GroupVariable) string {
	return gv.Key
}

type GitlabMockProjectsClient struct {
	listProjectsGroups func(pid any, opt *gitlab.ListProjectGroupOptions, options ...gitlab.RequestOptionFunc) ([]*gitlab.ProjectGroup, *gitlab.Response, error)
}

func (mc *GitlabMockProjectsClient) ListProjectsGroups(pid any, opt *gitlab.ListProjectGroupOptions, _ ...gitlab.RequestOptionFunc) ([]*gitlab.ProjectGroup, *gitlab.Response, error) {
	return mc.listProjectsGroups(pid, opt, nil)
}

func (mc *GitlabMockProjectsClient) WithValue(output []*gitlab.ProjectGroup, response *gitlab.Response, err error) {
	if mc != nil {
		mc.listProjectsGroups = func(pid any, opt *gitlab.ListProjectGroupOptions, options ...gitlab.RequestOptionFunc) ([]*gitlab.ProjectGroup, *gitlab.Response, error) {
			return output, response, err
		}
	}
}

type GitlabMockProjectVariablesClient struct {
	getVariable   func(pid any, key string, options ...gitlab.RequestOptionFunc) (*gitlab.ProjectVariable, *gitlab.Response, error)
	listVariables func(pid any, options ...gitlab.RequestOptionFunc) ([]*gitlab.ProjectVariable, *gitlab.Response, error)
}

func (mc *GitlabMockProjectVariablesClient) GetVariable(pid any, key string, _ *gitlab.GetProjectVariableOptions, _ ...gitlab.RequestOptionFunc) (*gitlab.ProjectVariable, *gitlab.Response, error) {
	return mc.getVariable(pid, key, nil)
}

func (mc *GitlabMockProjectVariablesClient) ListVariables(pid any, _ *gitlab.ListProjectVariablesOptions, _ ...gitlab.RequestOptionFunc) ([]*gitlab.ProjectVariable, *gitlab.Response, error) {
	return mc.listVariables(pid)
}

func (mc *GitlabMockProjectVariablesClient) WithValue(response APIResponse[[]*gitlab.ProjectVariable]) {
	mc.WithValues([]APIResponse[[]*gitlab.ProjectVariable]{response})
}

func (mc *GitlabMockProjectVariablesClient) WithValues(responses []APIResponse[[]*gitlab.ProjectVariable]) {
	if mc != nil {
		mc.getVariable = mockGetVariable(keyFromProjectVariable, responses)
		mc.listVariables = mockListVariable(responses)
	}
}

func mockGetVariable[V GitVariable](keyExtractor extractKey[V], responses []APIResponse[[]*V]) func(any, string, ...gitlab.RequestOptionFunc) (*V, *gitlab.Response, error) {
	getCount := -1
	return func(pid any, key string, options ...gitlab.RequestOptionFunc) (*V, *gitlab.Response, error) {
		getCount++
		if getCount > len(responses)-1 {
			return nil, make404APIResponse(), errors.New("404 Not Found")
		}
		var match *V
		for _, v := range responses[getCount].Output {
			if keyExtractor(*v) == key {
				match = v
			}
		}
		return match, responses[getCount].Response, responses[getCount].Error
	}
}

func mockListVariable[V GitVariable](responses []APIResponse[[]*V]) func(any, ...gitlab.RequestOptionFunc) ([]*V, *gitlab.Response, error) {
	listCount := -1
	return func(pid any, options ...gitlab.RequestOptionFunc) ([]*V, *gitlab.Response, error) {
		listCount++
		if listCount > len(responses)-1 {
			return nil, makeAPIResponse(listCount, len(responses)), nil
		}
		return responses[listCount].Output, responses[listCount].Response, responses[listCount].Error
	}
}

func make404APIResponse() *gitlab.Response {
	return &gitlab.Response{
		Response: &http.Response{
			StatusCode: http.StatusNotFound,
		},
	}
}

func makeAPIResponse(page, pages int) *gitlab.Response {
	return &gitlab.Response{
		Response: &http.Response{
			StatusCode: http.StatusOK,
		},
		CurrentPage: page,
		TotalPages:  pages,
	}
}

type GitlabMockGroupVariablesClient struct {
	getVariable   func(gid any, key string, options ...gitlab.RequestOptionFunc) (*gitlab.GroupVariable, *gitlab.Response, error)
	listVariables func(gid any, options ...gitlab.RequestOptionFunc) ([]*gitlab.GroupVariable, *gitlab.Response, error)
}

func (mc *GitlabMockGroupVariablesClient) GetVariable(gid any, key string, _ *gitlab.GetGroupVariableOptions, _ ...gitlab.RequestOptionFunc) (*gitlab.GroupVariable, *gitlab.Response, error) {
	return mc.getVariable(gid, key, nil)
}

func (mc *GitlabMockGroupVariablesClient) ListVariables(gid any, _ *gitlab.ListGroupVariablesOptions, _ ...gitlab.RequestOptionFunc) ([]*gitlab.GroupVariable, *gitlab.Response, error) {
	return mc.listVariables(gid)
}

func (mc *GitlabMockGroupVariablesClient) WithValue(output *gitlab.GroupVariable, response *gitlab.Response, err error) {
	if mc != nil {
		mc.getVariable = func(gid any, key string, options ...gitlab.RequestOptionFunc) (*gitlab.GroupVariable, *gitlab.Response, error) {
			return output, response, err
		}

		mc.listVariables = func(gid any, options ...gitlab.RequestOptionFunc) ([]*gitlab.GroupVariable, *gitlab.Response, error) {
			return []*gitlab.GroupVariable{output}, response, err
		}
	}
}

func (mc *GitlabMockGroupVariablesClient) WithValues(responses []APIResponse[[]*gitlab.GroupVariable]) {
	if mc != nil {
		mc.getVariable = mockGetVariable(keyFromGroupVariable, responses)
		mc.listVariables = mockListVariable(responses)
	}
}
