package jira

import (
	"fmt"

	"github.com/google/go-querystring/query"
)

// SprintService handles sprints in JIRA Agile API.
// See https://docs.atlassian.com/jira-software/REST/cloud/
type SprintService struct {
	client *Client
}

// IssuesWrapper represents a wrapper struct for moving issues to sprint
type IssuesWrapper struct {
	Issues []string `json:"issues"`
}

// IssuesInSprintResult represents a wrapper struct for search result
type IssuesInSprintResult struct {
	Issues []Issue `json:"issues"`
}

// MoveIssuesToSprint moves issues to a sprint, for a given sprint Id.
// Issues can only be moved to open or active sprints.
// The maximum number of issues that can be moved in one operation is 50.
//
// JIRA API docs: https://docs.atlassian.com/jira-software/REST/cloud/#agile/1.0/sprint-moveIssuesToSprint
func (s *SprintService) MoveIssuesToSprint(sprintID int, issueIDs []string) (*Response, error) {
	apiEndpoint := fmt.Sprintf("rest/agile/1.0/sprint/%d/issue", sprintID)

	payload := IssuesWrapper{Issues: issueIDs}

	req, err := s.client.NewRequest("POST", apiEndpoint, payload)

	if err != nil {
		return nil, err
	}

	resp, err := s.client.Do(req, nil)
	if err != nil {
		err = NewJiraError(resp, err)
	}
	return resp, err
}

// GetIssuesForSprint returns all issues in a sprint, for a given sprint Id.
// This only includes issues that the user has permission to view.
// By default, the returned issues are ordered by rank.
//
//  JIRA API Docs: https://docs.atlassian.com/jira-software/REST/cloud/#agile/1.0/sprint-getIssuesForSprint
func (s *SprintService) GetIssuesForSprint(sprintID int) ([]Issue, *Response, error) {
	apiEndpoint := fmt.Sprintf("rest/agile/1.0/sprint/%d/issue", sprintID)

	req, err := s.client.NewRequest("GET", apiEndpoint, nil)

	if err != nil {
		return nil, nil, err
	}

	result := new(IssuesInSprintResult)
	resp, err := s.client.Do(req, result)
	if err != nil {
		err = NewJiraError(resp, err)
	}

	return result.Issues, resp, err
}

// GetIssue returns a full representation of the issue for the given issue key.
// JIRA will attempt to identify the issue by the issueIdOrKey path parameter.
// This can be an issue id, or an issue key.
// If the issue cannot be found via an exact match, JIRA will also look for the issue in a case-insensitive way, or by looking to see if the issue was moved.
//
// The given options will be appended to the query string
//
// JIRA API docs: https://docs.atlassian.com/jira-software/REST/7.3.1/#agile/1.0/issue-getIssue
//
// TODO: create agile service for holding all agile apis' implementation
func (s *SprintService) GetIssue(issueID string, options *GetQueryOptions) (*Issue, *Response, error) {
	apiEndpoint := fmt.Sprintf("rest/agile/1.0/issue/%s", issueID)

	req, err := s.client.NewRequest("GET", apiEndpoint, nil)

	if err != nil {
		return nil, nil, err
	}

	if options != nil {
		q, err := query.Values(options)
		if err != nil {
			return nil, nil, err
		}
		req.URL.RawQuery = q.Encode()
	}

	issue := new(Issue)
	resp, err := s.client.Do(req, issue)

	if err != nil {
		jerr := NewJiraError(resp, err)
		return nil, resp, jerr
	}

	return issue, resp, nil
}