package github

import (
	"context"
	"time"
)

// Client defines the interface for interacting with the GitHub API.
type Client interface {
	// IsAuthenticated checks if the client is authenticated with GitHub.
	IsAuthenticated(ctx context.Context) (bool, error)

	// GetAuthenticatedUser returns the username of the authenticated user.
	GetAuthenticatedUser(ctx context.Context) (string, error)

	// GetPR retrieves a single pull request by number.
	GetPR(ctx context.Context, owner, repo string, number int) (*PR, error)

	// FindPRByBranch finds an open PR for the given head branch.
	FindPRByBranch(ctx context.Context, owner, repo, branch string) (*PR, error)

	// ListAuthoredPRs lists open PRs authored by the authenticated user for a repo.
	ListAuthoredPRs(ctx context.Context, owner, repo string) ([]*PR, error)

	// ListReviewRequestedPRs lists open PRs where the user's review is requested.
	// scope controls the search qualifier: ReviewScopeUser uses user-review-requested:@me,
	// ReviewScopeUserAndTeams (or empty) uses review-requested:@me.
	// filter is an optional additional search qualifier (e.g. "repo:owner/name" or "org:myorg").
	// customQuery, when non-empty, replaces the entire generated query.
	ListReviewRequestedPRs(ctx context.Context, scope, filter, customQuery string) ([]*PR, error)

	// ListUserOrgs returns the GitHub organizations the authenticated user belongs to.
	ListUserOrgs(ctx context.Context) ([]GitHubOrg, error)

	// SearchOrgRepos searches repositories in an organization, optionally filtered by a query string.
	SearchOrgRepos(ctx context.Context, org, query string, limit int) ([]GitHubRepo, error)

	// ListPRReviews lists reviews on a pull request.
	ListPRReviews(ctx context.Context, owner, repo string, number int) ([]PRReview, error)

	// ListPRComments lists review comments on a pull request.
	// If since is non-nil, only comments updated after that time are returned.
	ListPRComments(ctx context.Context, owner, repo string, number int, since *time.Time) ([]PRComment, error)

	// ListCheckRuns lists CI check runs for a given git ref (branch or SHA).
	ListCheckRuns(ctx context.Context, owner, repo, ref string) ([]CheckRun, error)

	// GetPRFeedback fetches aggregated feedback (reviews, comments, checks) for a PR.
	GetPRFeedback(ctx context.Context, owner, repo string, number int) (*PRFeedback, error)

	// GetPRStatus fetches lightweight PR status (state, review summary, checks summary).
	// Unlike GetPRFeedback, it skips comments for efficiency.
	GetPRStatus(ctx context.Context, owner, repo string, number int) (*PRStatus, error)

	// ListPRFiles lists files changed in a pull request.
	ListPRFiles(ctx context.Context, owner, repo string, number int) ([]PRFile, error)

	// ListPRCommits lists commits in a pull request.
	ListPRCommits(ctx context.Context, owner, repo string, number int) ([]PRCommitInfo, error)

	// SubmitReview submits a review on a pull request.
	// event is one of "APPROVE", "COMMENT", "REQUEST_CHANGES".
	SubmitReview(ctx context.Context, owner, repo string, number int, event, body string) error

	// MergePR merges a pull request. mergeMethod is one of "merge", "squash", "rebase".
	MergePR(ctx context.Context, owner, repo string, number int, mergeMethod string) error

	// ListRepoBranches lists branches for a repository.
	ListRepoBranches(ctx context.Context, owner, repo string) ([]RepoBranch, error)

	// GetRepoMergeMethods reports which merge methods a repository allows.
	GetRepoMergeMethods(ctx context.Context, owner, repo string) (RepoMergeMethods, error)

	// ListIssues searches for open issues (not PRs) matching the given query.
	// filter is an optional additional search qualifier (e.g. "repo:owner/name" or "label:bug").
	// customQuery, when non-empty, replaces the entire generated query.
	ListIssues(ctx context.Context, filter, customQuery string) ([]*Issue, error)

	// SearchPRs searches for PRs matching the given query.
	// filter is an optional additional search qualifier (e.g. "author:@me" or "repo:owner/name").
	// customQuery, when non-empty, replaces the entire generated query.
	SearchPRs(ctx context.Context, filter, customQuery string) ([]*PR, error)

	// SearchPRsPaged is the paginated variant of SearchPRs. page is 1-indexed;
	// perPage is clamped to GitHub's 1..100 range by the implementation.
	SearchPRsPaged(ctx context.Context, filter, customQuery string, page, perPage int) (*PRSearchPage, error)

	// ListIssuesPaged is the paginated variant of ListIssues.
	ListIssuesPaged(ctx context.Context, filter, customQuery string, page, perPage int) (*IssueSearchPage, error)

	// GetIssueState returns the state of a single issue ("open" or "closed").
	GetIssueState(ctx context.Context, owner, repo string, number int) (string, error)

	// CreateGist creates a new gist on the authenticated user's account.
	// Set Public=false to create a secret (unlisted) gist.
	CreateGist(ctx context.Context, in CreateGistInput) (*GistResponse, error)

	// DeleteGist deletes a gist by ID. A 404 is wrapped in *GitHubAPIError
	// so callers can distinguish "already gone" from transport failures.
	DeleteGist(ctx context.Context, gistID string) error
}