// Copyright 2017 Drone.IO Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package bitbucket

import (
	"net/url"
	"regexp"
	"strconv"
	"strings"

	"git.awesome-for.me/liuzhiguo/go-scm/scm"
)

// regex for git author fields ("name <name@mail.tld>")
var reGitMail = regexp.MustCompile("<(.*)>")

// extracts the email from a git commit author string
func extractEmail(gitauthor string) (author string) {
	matches := reGitMail.FindAllStringSubmatch(gitauthor, -1)
	if len(matches) == 1 {
		author = matches[0][1]
	}
	return
}

func encodeBranchListOptions(opts scm.BranchListOptions) string {
	params := url.Values{}
	if opts.SearchTerm != "" {
		var sb strings.Builder
		sb.WriteString("name~\"")
		sb.WriteString(opts.SearchTerm)
		sb.WriteString("\"")
		params.Set("q", sb.String())
	}
	if opts.PageListOptions != (scm.ListOptions{}) {
		if opts.PageListOptions.Page != 0 {
			params.Set("page", strconv.Itoa(opts.PageListOptions.Page))
		}
		if opts.PageListOptions.Size != 0 {
			params.Set("pagelen", strconv.Itoa(opts.PageListOptions.Size))
		}
	}
	return params.Encode()
}

func encodeListOptions(opts scm.ListOptions) string {
	params := url.Values{}
	if opts.Page != 0 {
		params.Set("page", strconv.Itoa(opts.Page))
	}
	if opts.Size != 0 {
		params.Set("pagelen", strconv.Itoa(opts.Size))
	}
	return params.Encode()
}

func encodeListRoleOptions(opts scm.ListOptions) string {
	params := url.Values{}
	if opts.Page != 0 {
		params.Set("page", strconv.Itoa(opts.Page))
	}
	if opts.Size != 0 {
		params.Set("pagelen", strconv.Itoa(opts.Size))
	}
	params.Set("role", "member")
	return params.Encode()
}

func encodeRepoListOptions(opts scm.RepoListOptions) string {
	params := url.Values{}
	if opts.RepoSearchTerm.RepoName != "" {
		var sb strings.Builder
		sb.WriteString("name~\"")
		sb.WriteString(opts.RepoSearchTerm.RepoName)
		sb.WriteString("\"")
		params.Set("q", sb.String())
	}
	if opts.ListOptions != (scm.ListOptions{}) {
		if opts.ListOptions.Page != 0 {
			params.Set("page", strconv.Itoa(opts.ListOptions.Page))
		}
		if opts.ListOptions.Size != 0 {
			params.Set("pagelen", strconv.Itoa(opts.ListOptions.Size))
		}
	}
	params.Set("role", "member")
	return params.Encode()
}

func encodeCommitListOptions(opts scm.CommitListOptions) string {
	params := url.Values{}
	if opts.Page != 0 {
		params.Set("page", strconv.Itoa(opts.Page))
	}
	if opts.Size != 0 {
		params.Set("pagelen", strconv.Itoa(opts.Size))
	}
	if opts.Path != "" {
		params.Set("path", opts.Path)
	}
	return params.Encode()
}

func encodeIssueListOptions(opts scm.IssueListOptions) string {
	params := url.Values{}
	if opts.Page != 0 {
		params.Set("page", strconv.Itoa(opts.Page))
	}
	if opts.Size != 0 {
		params.Set("pagelen", strconv.Itoa(opts.Size))
	}
	if opts.Open && opts.Closed {
		params.Set("state", "all")
	} else if opts.Closed {
		params.Set("state", "closed")
	}
	return params.Encode()
}

func encodePullRequestListOptions(opts scm.PullRequestListOptions) string {
	params := url.Values{}
	if opts.Page != 0 {
		params.Set("page", strconv.Itoa(opts.Page))
	}
	if opts.Size != 0 {
		params.Set("pagelen", strconv.Itoa(opts.Size))
	}
	if opts.Open && opts.Closed {
		params.Set("state", "all")
	} else if opts.Closed {
		params.Set("state", "closed")
	}
	return params.Encode()
}

func copyPagination(from pagination, to *scm.Response) error {
	if to == nil {
		return nil
	}
	to.Page.NextURL = from.Next
	uri, err := url.Parse(from.Next)
	if err != nil {
		return err
	}
	page := uri.Query().Get("page")
	to.Page.First = 1
	to.Page.Next, _ = strconv.Atoi(page)
	return nil
}