package vc

import (
	"fmt"

	"github.com/mobyvb/pull-pal/llm"

	"github.com/go-git/go-git/v5"
)

// Issue represents an issue on a version control server.
type Issue struct {
	ID      string
	Subject string
	Body    string
	URL     string
	Author  Author
}

func (i Issue) String() string {
	return fmt.Sprintf("Issue ID: %s\nAuthor: %s\nSubject: %s\nBody:\n%s\nURL: %s\n", i.ID, i.Author.Handle, i.Subject, i.Body, i.URL)
}

// ListIssueOptions defines options for listing issues.
type ListIssueOptions struct {
	// Labels defines the list of labels an issue must have in order to be listed
	// The issue must have *every* label provided.
	Labels []string
	// Handles defines the list of usernames to list issues from
	// The issue can be created by *any* user provided.
	Handles []string
}

// Comment represents a comment on a code change request.
// TODO comments on issue?
type Comment struct {
	ID string
	// ChangeID is the local identifier for the code change request this comment was left on (e.g. Github PR number)
	ChangeID string
	Author   Author
	Body     string
	Position int
	DiffHunk string
	URL      string
}

func (c Comment) String() string {
	return fmt.Sprintf("Comment ID: %s\nAuthor: %s\nBody: %s\nPosition: %d\n\nDiffHunk:\n%s\n\nURL: %s\n", c.ID, c.Author.Handle, c.Body, c.Position, c.DiffHunk, c.URL)
}

// ListCommentOptions defines options for listing comments.
type ListCommentOptions struct {
	// ChangeID is the local identifier for the code change request to list comments from (e.g. Github PR number)
	ChangeID string
	// Handles defines the list of usernames to list comments from
	// The comment can be created by *any* user provided.
	Handles []string
}

// Author represents a commit, issue, or code change request author on a version control server.
type Author struct {
	Email  string
	Handle string
	Token  string
}

// Repository represents a version control repository and its local path.
type Repository struct {
	LocalPath  string
	HostDomain string
	Name       string
	Owner      Author
	localRepo  *git.Repository
}

// SSH returns the SSH connection string for the repository.
func (repo Repository) SSH() string {
	return fmt.Sprintf("git@%s:%s/%s.git", repo.HostDomain, repo.Owner.Handle, repo.Name)
}

// HTTPS returns the HTTPS representation of the remote repository.
func (repo Repository) HTTPS() string {
	return fmt.Sprintf("https://%s/%s/%s.git", repo.HostDomain, repo.Owner.Handle, repo.Name)
}

// VCClient is an interface for version control server's client, e.g. a Github or Gerrit client.
type VCClient interface {
	// ListOpenIssues lists unresolved issues meeting the provided criteria on the version control server.
	ListOpenIssues(opts ListIssueOptions) ([]Issue, error)
	// ListOpenComments lists unresolved comments meeting the provided criteria on the version control server.
	ListOpenComments(opts ListCommentOptions) ([]Comment, error)
	// OpenCodeChangeRequest opens a new "code change request" on the version control server (e.g. "pull request" in Github).
	OpenCodeChangeRequest(req llm.CodeChangeRequest, res llm.CodeChangeResponse) (id, url string, err error)
	// UpdateCodeChangeRequest updates an existing code change request on the version control server.
	// UpdateCodeChangeRequest(id string, res llm.CodeChangeResponse)
	// TODO: add/read comments to/from issues and code change requests
	// GetLocalFile gets the current representation of the file at the provided path from the local git repo.
	GetLocalFile(path string) (llm.File, error)
	// StartCommit initiates a commit process, after which files can be modified and added to the commit.
	StartCommit() error
	// ReplaceOrAddLocalFile updates or adds a file in the locally cloned repo, and applies these changes to the current git worktree.
	ReplaceOrAddLocalFile(newFile llm.File) error
	// FinishCommit completes a commit, after which a code change request can be opened or updated.
	FinishCommit(message string) error
}