package main

/*
 * This file is part of Autogits.
 *
 * Copyright © 2024 SUSE LLC
 *
 * Autogits is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 2 of the License, or (at your option) any later
 * version.
 *
 * Autogits is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * Foobar. If not, see <https://www.gnu.org/licenses/>.
 */

import (
	"flag"
	"net/url"
	"os"
	"regexp"
	"slices"
	"strconv"
	"time"

	"src.opensuse.org/autogits/common"
	"src.opensuse.org/autogits/common/gitea-generated/models"
)

const (
	AppName = "workflow-pr"
)

var GitAuthor string
var GitEmail string

var ListPROnly bool
var PRID int64
var CurrentUser *models.User
var GitHandler common.GitHandlerGenerator
var Gitea common.Gitea

func main() {
	flag.StringVar(&GitAuthor, "git-author", "AutoGits PR Review Bot", "Git commit author")
	flag.StringVar(&GitEmail, "git-email", "amajer+devel-git@suse.de", "Git commit email")

	workflowConfig := flag.String("config", "", "Repository and workflow definition file")
	giteaUrl := flag.String("gitea-url", "https://src.opensuse.org", "Gitea instance")
	rabbitUrl := flag.String("url", "amqps://rabbit.opensuse.org", "URL for RabbitMQ instance")
	debugMode := flag.Bool("debug", false, "Extra debugging information")
	checkOnStart := flag.Bool("check-on-start", false, "Check all repositories for consistency on start, without delays")
	checkIntervalHours := flag.Float64("check-interval", 5, "Check interval (+-random delay) for repositories for consitency, in hours")
	flag.BoolVar(&ListPROnly, "list-prs-only", false, "Only lists PRs without acting on them")
	flag.Int64Var(&PRID, "id", -1, "Process only the specific ID and ignore the rest. Use for debugging")
	basePath := flag.String("repo-path", "", "Repository path. Default is temporary directory")
	pr := flag.String("only-pr", "", "Only specific PR to process. For debugging")
	flag.BoolVar(&common.IsDryRun, "dry", false, "Dry mode. Do not push changes to remote repo.")
	flag.Parse()

	common.SetLoggingLevel(common.LogLevelInfo)
	if *debugMode {
		common.SetLoggingLevel(common.LogLevelDebug)
	}

	if err := common.RequireGiteaSecretToken(); err != nil {
		common.LogError("No Gitea secrets:", err)
		return
	}
	if err := common.RequireRabbitSecrets(); err != nil {
		common.LogError("No RabbitMQ secret:", err)
		return
	}

	common.LogDebug("Parsing config:", *workflowConfig)
	if len(*workflowConfig) == 0 {
		common.LogError("No configuratio file specified. Aborting")
		return
	}

	Gitea = common.AllocateGiteaTransport(*giteaUrl)
	config, err := common.ReadConfigFile(*workflowConfig)
	if err != nil {
		common.LogError("Cannot read config files:", err)
		return
	}

	configs, err := common.ResolveWorkflowConfigs(Gitea, config)
	if err != nil {
		common.LogError("Cannot resolve config files:", err)
		return
	}

	for _, c := range configs {
		common.LogDebug(*c)
	}

	req := new(RequestProcessor)
	req.configuredRepos = make(map[string][]*common.AutogitConfig)

	if len(*basePath) == 0 {
		*basePath, err = os.MkdirTemp(os.TempDir(), AppName)
		common.PanicOnError(err)
		defer os.RemoveAll(*basePath)
	}
	GitHandler, err = common.AllocateGitWorkTree(*basePath, GitAuthor, GitEmail)
	common.PanicOnError(err)

	orgs := make([]string, 0, 1)
	for _, c := range configs {
		if slices.Contains(c.Workflows, "pr") {
			common.LogDebug("  + adding org:", c.Organization, "  branch:", c.Branch, "  prjgit:", c.GitProjectName)
			configs := req.configuredRepos[c.Organization]
			if configs == nil {
				configs = make([]*common.AutogitConfig, 0, 1)
			}
			configs = append(configs, c)
			req.configuredRepos[c.Organization] = configs

			orgs = append(orgs, c.Organization)

			// add project git organization, if different
			if prjOrg, _, _ := c.GetPrjGit(); prjOrg != c.Organization {
				orgs = append(orgs, prjOrg)
				req.configuredRepos[prjOrg] = configs
			}
		}
	}

	if CurrentUser, err = Gitea.GetCurrentUser(); err != nil {
		common.LogError("Failed to fetch current gitea user:", err)
		return
	}
	common.LogInfo("Running with token from", CurrentUser.UserName)

	if *pr != "" {
		rx := regexp.MustCompile("^([a-zA-Z0-9_\\.-]+)/([a-zA-Z0-9_\\.-]+)[!#]([0-9]+)$")
		if data := rx.FindStringSubmatch(*pr); data == nil {
			common.LogError("Cannot parse PR line to process", *pr)
		} else {
			org := data[1]
			repo := data[2]
			num, err := strconv.ParseInt(data[3], 10, 64)
			common.LogInfo("Processing:", org, "/", repo, "#", num)
			common.PanicOnError(err)
			pr, err := Gitea.GetPullRequest(org, repo, num)
			if err != nil {
				common.LogError("Cannot fetch PR", err)
				return
			}

			if err = ProcesPullRequest(pr, configs); err != nil {
				common.LogError("processor returned error", err)
			}
		}

		return
	}

	checker := CreateDefaultStateChecker(*checkOnStart, req, Gitea, time.Duration(*checkIntervalHours)*time.Hour)
	go checker.ConsistencyCheckProcess()

	listenDefs := &common.RabbitMQGiteaEventsProcessor{
		Orgs: orgs,
		Handlers: map[string]common.RequestProcessor{
			common.RequestType_PR:               req,
			common.RequestType_PRSync:           req,
			common.RequestType_PRReviewAccepted: req,
			common.RequestType_PRReviewRejected: req,
			common.RequestType_IssueComment:     req,
		},
	}
	listenDefs.Connection().RabbitURL, _ = url.Parse(*rabbitUrl)

	common.PanicOnError(common.ProcessRabbitMQEvents(listenDefs))
}