// Copyright 2025 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package base

import (
	"fmt"
	"log"
	"os"

	"code.gitea.io/tea/modules/config"
	"code.gitea.io/tea/modules/context"
	"code.gitea.io/tea/modules/interact"
	"code.gitea.io/tea/modules/utils"

	gogit "github.com/go-git/go-git/v5"
	"github.com/urfave/cli/v3"
)

// InitCommand resolves the application context, and returns the active login, and if
// available the repo slug. It does this by reading the config file for logins, parsing
// the remotes of the .git repo specified in repoFlag or $PWD, and using overrides from
// command flags. If a local git repo can't be found, repo slug values are unset.
func InitCommand(cmd *cli.Command) *context.TeaContext {
	// these flags are used as overrides to the context detection via local git repo
	repoFlag := cmd.String("repo")
	loginFlag := cmd.String("login")
	remoteFlag := cmd.String("remote")

	var (
		c                  context.TeaContext
		err                error
		repoPath           string // empty means PWD
		repoFlagPathExists bool
	)

	// check if repoFlag can be interpreted as path to local repo.
	if len(repoFlag) != 0 {
		if repoFlagPathExists, err = utils.DirExists(repoFlag); err != nil {
			log.Fatal(err.Error())
		}
		if repoFlagPathExists {
			repoPath = repoFlag
		}
	}

	if len(remoteFlag) == 0 {
		remoteFlag = config.GetPreferences().FlagDefaults.Remote
	}

	if repoPath == "" {
		if repoPath, err = os.Getwd(); err != nil {
			log.Fatal(err.Error())
		}
	}

	// try to read local git repo & extract context: if repoFlag specifies a valid path, read repo in that dir,
	// otherwise attempt PWD. if no repo is found, continue with default login
	if c.LocalRepo, c.Login, c.RepoSlug, err = context.ContextFromLocalRepo(repoPath, remoteFlag); err != nil {
		if err == context.ErrNotAGiteaRepo || err == gogit.ErrRepositoryNotExists {
			// we can deal with that, commands needing the optional values use ctx.Ensure()
		} else {
			log.Fatal(err.Error())
		}
	}

	if len(repoFlag) != 0 && !repoFlagPathExists {
		// if repoFlag is not a valid path, use it to override repoSlug
		c.RepoSlug = repoFlag
	}

	// override config user with env variable
	envLogin := context.GetLoginByEnvVar()
	if envLogin != nil {
		_, err := utils.ValidateAuthenticationMethod(envLogin.URL, envLogin.Token, "", "", false, "", "")
		if err != nil {
			log.Fatal(err.Error())
		}
		c.Login = envLogin
	}

	// override login from flag, or use default login if repo based detection failed
	if len(loginFlag) != 0 {
		c.Login = config.GetLoginByName(loginFlag)
		if c.Login == nil {
			log.Fatalf("Login name '%s' does not exist", loginFlag)
		}
	} else if c.Login == nil {
		c.Login, err = interact.LoginSelect()
		if err != nil {
			// TODO: maybe we can directly start interact.CreateLogin() (only if
			// we're sure we can interactively!), as gh cli does.
			fmt.Println(`No gitea login configured. To start using tea, first run
  tea login add
and then run your command again.`)
			os.Exit(1)
		}
	}

	// parse reposlug (owner falling back to login owner if reposlug contains only repo name)
	c.Owner, c.Repo = utils.GetOwnerAndRepo(c.RepoSlug, c.Login.User)
	c.Command = cmd
	c.Output = cmd.String("output")
	return &c
}