//
// "Current Branch" section: the pull requests and workflow runs that belong to
// the branch checked out in the workspace (or to the configured branch filter).
//

const builders = require("./builders.js");
const config = require("../util/config.js");
const nodes = require("./nodes.js");
const { NodeProvider } = require("./provider.js");

const { node, message, errorNode } = nodes;

class BranchProvider extends NodeProvider {
    roots() {
        const store = this.store;

        if (!store.router.baseUrls.length) {
            return [message("No Gitea instance configured. Open the extension preferences.")];
        }
        if (!store.hasAnyToken) {
            return [message("No token stored. Run “Gitea → Set Token…” to sign in.")];
        }
        if (!store.repos.length) {
            if (store.unmatchedHosts.length) return builders.unmatchedHostNodes(store);
            return [
                message(
                    store.loading
                        ? "Loading…"
                        : "No repository in this workspace points at a configured Gitea instance.",
                ),
            ];
        }

        const filter = config.branchFilter();
        const sections = store.repos.map((repo) => this.repoSection(repo, filter));
        return store.repos.length === 1 ? sections[0].children : sections;
    }

    repoSection(repo, filter) {
        const branch = this.store.branchFor(repo);
        const label =
            filter.mode === "all"
                ? "all branches"
                : branch || "no branch (detached HEAD)";

        return node("repo", repo.fullName, {
            identifier: `branch-repo-${repo.key}`,
            description: label,
            tooltip: `${repo.htmlUrl}\nBranch filter: ${label}`,
            contextValue: "repo",
            repo: repo,
            data: { repoKey: repo.key },
            expanded: true,
            children: [this.pullRequestsFolder(repo, branch), this.runsFolder(repo, branch)],
        });
    }

    pullRequestsFolder(repo, branch) {
        const { items, error } = this.store.pullRequestsFor(repo.key);
        const matching = branch
            ? items.filter((pull) => pull.head && pull.head.ref === branch)
            : items;

        let children;
        if (error) children = [errorNode(error)];
        else if (!matching.length) {
            children = [
                message(
                    branch
                        ? `No open pull request from ${branch}.`
                        : "No open pull requests.",
                ),
            ];
        } else {
            children = matching.map((pull) => builders.pullRequestNode(this.store, repo, pull));
        }

        return node("prFolder", "Pull Requests", {
            identifier: `branch-prs-${repo.key}`,
            description: matching.length ? String(matching.length) : "",
            contextValue: "prFolder",
            repo: repo,
            expanded: true,
            children: children,
        });
    }

    runsFolder(repo, branch) {
        const { runs, error, legacy } = this.store.runsFor(repo.key);
        const matching = branch ? runs.filter((run) => run.head_branch === branch) : runs;

        let children;
        if (error) children = [errorNode(error)];
        else if (!matching.length) {
            children = [
                message(branch ? `No runs for ${branch}.` : "No workflow runs."),
            ];
        } else {
            children = matching.map((run) =>
                builders.runNode(this.store, repo, run, { showBranch: !branch }),
            );
        }

        return node("runsFolder", legacy ? "Recent Runs" : "Workflow Runs", {
            identifier: `branch-runs-${repo.key}`,
            description: matching.length ? String(matching.length) : "",
            tooltip: legacy
                ? "This Gitea server predates the workflow runs API; showing recent tasks instead."
                : "",
            contextValue: "runsFolder",
            repo: repo,
            expanded: true,
            children: children,
        });
    }
}

exports.BranchProvider = BranchProvider;