package cmd

import (
	"errors"
	"fmt"
	"os"
	"strconv"
	"strings"

	"gitea.com/jolheiser/sip/modules/csv"
	"gitea.com/jolheiser/sip/modules/markdown"
	"gitea.com/jolheiser/sip/modules/sdk"

	"code.gitea.io/sdk/gitea"
	"github.com/AlecAivazis/survey/v2"
	"github.com/urfave/cli/v2"
	"go.jolheiser.com/beaver"
	"go.jolheiser.com/beaver/color"
)

var Issues = cli.Command{
	Name:    "issues",
	Aliases: []string{"issue"},
	Usage:   "Commands for interacting with issues",
	Action:  doIssuesSearch,
	Subcommands: []*cli.Command{
		&IssuesCreate,
	},
	Flags: []cli.Flag{
		&cli.StringFlag{
			Name:  "csv",
			Usage: "Output results to a CSV file",
		},
	},
}

func doIssuesSearch(ctx *cli.Context) error {
	if _, err := issuesSearch(ctx, false); err != nil {
		return err
	}
	return nil
}

func issuesSearch(ctx *cli.Context, pulls bool) (*gitea.Issue, error) {
	client, err := getClient(ctx, false)
	if err != nil {
		return nil, err
	}

	typ := "issues"
	if pulls {
		typ = "pulls"
	}
	issues, err := queryIssues(ctx, client, pulls)
	if err != nil {
		return nil, err
	}

	if len(issues) == 0 {
		beaver.Errorf("No %s found!", typ)
		return nil, nil
	}

	if ctx.String("csv") != "" {
		fi, err := os.Create(ctx.String("csv"))
		if err != nil {
			return nil, err
		}
		if _, err := fi.WriteString(csv.Issues(issues)); err != nil {
			return nil, err
		}
		fmt.Println(color.FgCyan.Formatf("Matching %s were exported to", typ), color.Info.Format(ctx.String("csv")))
		return nil, fi.Close()
	}

	issueMap := make(map[string]*gitea.Issue)
	for _, issue := range issues {
		index := color.New(color.FgCyan).Format("#" + strconv.Itoa(int(issue.Index)))
		title := color.New(color.FgYellow).Format(issue.Title)
		state := color.New(color.FgGreen).Format("[open]")
		if issue.PullRequest != nil && issue.PullRequest.HasMerged {
			state = color.New(color.FgMagenta).Format("[merged]")
		} else if issue.State == gitea.StateClosed {
			state = color.New(color.FgRed).Format("[closed]")
		}
		lbls := make([]string, len(issue.Labels))
		for idx, label := range issue.Labels {
			lbls[idx] = label.Name
		}
		var labels string
		if len(lbls) > 0 {
			labels = color.New(color.FgHiBlack).Format("(" + strings.Join(lbls, ", ") + ")")
		}
		issueMap[fmt.Sprintf("%s %s %s %s", index, state, title, labels)] = issue
	}

	list := make([]string, 0)
	for key := range issueMap {
		list = append(list, key)
	}
	sel := &survey.Select{Options: list, Message: "Matching " + typ}
	var selection string
	if err := survey.AskOne(sel, &selection); err != nil {
		return nil, err
	}

	body, err := markdown.Render(issueMap[selection].Body)
	if err != nil {
		return nil, err
	}

	fmt.Println(body)
	return issueMap[selection], nil
}

func queryIssues(ctx *cli.Context, client *gitea.Client, pulls bool) ([]*gitea.Issue, error) {
	owner, repo, err := askOwnerRepo(ctx)
	if err != nil {
		return nil, err
	}

	question := &survey.Input{Message: "Search query"}
	var answer string
	if err := survey.AskOne(question, &answer); err != nil {
		return nil, err
	}

	filter := sdk.NewIssueFilter(answer)
	opts := gitea.ListIssueOption{KeyWord: filter.Query, State: "all"}
	issues, err := sdk.GetIssues(client, owner, repo, opts)
	if err != nil {
		return nil, err
	}

	filtered := make([]*gitea.Issue, 0)
	for _, issue := range issues {
		// Filter out issues if searching PRs and vice-versa
		if (pulls && issue.PullRequest == nil) ||
			(!pulls && issue.PullRequest != nil) {
			continue
		}

		if !filter.Match(issue) {
			continue
		}

		filtered = append(filtered, issue)
	}

	return filtered, nil
}

func askOwnerRepo(ctx *cli.Context) (string, string, error) {
	question := []*survey.Question{
		{
			Name:     "repo",
			Prompt:   &survey.Input{Message: "Full repository name", Default: fullName(ctx)},
			Validate: validateFullName,
		},
	}
	answer := struct {
		Repo string
	}{}

	if err := survey.Ask(question, &answer); err != nil {
		return "", "", err
	}

	ownerRepo := strings.Split(answer.Repo, "/")
	return ownerRepo[0], ownerRepo[1], nil
}

func validateFullName(ans interface{}) error {
	fullName := ans.(string)
	ownerRepo := strings.Split(fullName, "/")
	if len(ownerRepo) != 2 {
		return errors.New("full repo name should be in form `owner/repo`")
	}
	return nil
}