// gitea's tools — moved here from the shared sdk (novox/hq ADR 0039), importing gitea's own client.
// They return structured data; the mesh serves them through the sdk's tool harness.
//
// Two tools emit an event at the natural point of the action they take (novox/hq ADR 0041/0042):
// create-issue emits issue.opened, merge-pull-request emits pull.merged — the mesh's own hand on
// the forge, announced the instant it moves. repo.created is deliberately NOT emitted here: repos
// are far more often born from a `git push` or the web UI than from this tool, so the events
// entrypoint (index.ts) owns that one by polling, which catches every path without this tool and
// the poll double-announcing the same repo from two processes.

import { registerModuleTools, type ToolDefinition } from "@novox/mesh-sdk/tools";
import { emit } from "@novox/mesh-sdk/events";
import { GiteaClient } from "../client.js";

/** Coerce a comma-separated label string into names; empty/absent yields none. */
function parseLabels(raw: unknown): string[] {
  if (raw === undefined || raw === null || raw === "") return [];
  return String(raw)
    .split(",")
    .map((s) => s.trim())
    .filter(Boolean);
}

export function getGiteaTools(gitea: GiteaClient): ToolDefinition[] {
  return [
    // ---- Repositories ----
    {
      name: "gitea_list_repos",
      description: "List repositories for the authenticated Gitea user.",
      input: {
        page: { type: "number", description: "page number (default 1)" },
        limit: { type: "number", description: "how many per page (default 20)" },
      },
      run: async (args) => ({
        repos: await gitea.listRepos(args.page ? Number(args.page) : 1, args.limit ? Number(args.limit) : 20),
      }),
    },
    {
      name: "gitea_create_repo",
      description: "Create a repository owned by the authenticated user.",
      input: {
        name: { type: "string", description: "the repository name" },
        description: { type: "string", description: "an optional description" },
        private: { type: "boolean", description: "private repo (default true)" },
        auto_init: { type: "boolean", description: "initialise with a README (default true)" },
      },
      run: async (args) => {
        const repo = await gitea.createRepo({
          name: String(args.name),
          description: args.description ? String(args.description) : undefined,
          private: args.private === undefined ? true : Boolean(args.private),
          auto_init: args.auto_init === undefined ? true : Boolean(args.auto_init),
        });
        return { repo };
      },
    },
    {
      name: "gitea_delete_repo",
      description: "Delete a repository. Destructive and irreversible — requires confirm=true.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        name: { type: "string", description: "the repository name" },
        confirm: { type: "boolean", description: "must be true to actually delete" },
      },
      run: async (args) => {
        if (!args.confirm) return { deleted: false, reason: "confirm must be true to delete a repository" };
        await gitea.deleteRepo(String(args.owner), String(args.name));
        return { deleted: true, repo: `${String(args.owner)}/${String(args.name)}` };
      },
    },

    // ---- Issues ----
    {
      name: "gitea_list_issues",
      description: "List issues for a repository, filterable by state and labels.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        state: { type: "string", description: "open | closed | all (default open)" },
        labels: { type: "string", description: "comma-separated label names to filter by" },
        page: { type: "number", description: "page number (default 1)" },
      },
      run: async (args) => {
        const params: Record<string, string> = {
          state: args.state ? String(args.state) : "open",
          page: String(args.page ? Number(args.page) : 1),
        };
        if (args.labels) params.labels = String(args.labels);
        return { issues: await gitea.listIssues(String(args.owner), String(args.repo), params) };
      },
    },
    {
      name: "gitea_get_issue",
      description: "Get a single issue by its number.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        number: { type: "number", description: "the issue number" },
      },
      run: async (args) => ({
        issue: await gitea.getIssue(String(args.owner), String(args.repo), Number(args.number)),
      }),
    },
    {
      name: "gitea_create_issue",
      description: "Open a new issue. Label names are resolved to ids, creating any that are missing.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        title: { type: "string", description: "the issue title" },
        body: { type: "string", description: "the issue body (markdown)" },
        labels: { type: "string", description: "comma-separated label names" },
      },
      run: async (args) => {
        const owner = String(args.owner);
        const repo = String(args.repo);
        const names = parseLabels(args.labels);
        const labelIds = names.length
          ? await Promise.all(names.map((n) => gitea.getOrCreateLabel(owner, repo, n)))
          : undefined;
        const issue = await gitea.createIssue(owner, repo, {
          title: String(args.title),
          body: args.body ? String(args.body) : undefined,
          labels: labelIds,
        });
        // The mesh just opened an issue — announce it the moment it exists.
        await emit("module.gitea.issue.opened", {
          owner,
          repo,
          number: issue.number,
          title: issue.title,
          user: issue.user,
          html_url: issue.html_url,
        });
        return { issue };
      },
    },
    {
      name: "gitea_close_issue",
      description: "Close an open issue.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        number: { type: "number", description: "the issue number" },
      },
      run: async (args) => ({
        issue: await gitea.setIssueState(String(args.owner), String(args.repo), Number(args.number), "closed"),
      }),
    },
    {
      name: "gitea_add_comment",
      description: "Add a comment to an issue or pull request.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        number: { type: "number", description: "the issue or PR number" },
        body: { type: "string", description: "the comment body (markdown)" },
      },
      run: async (args) => ({
        comment: await gitea.addComment(String(args.owner), String(args.repo), Number(args.number), String(args.body)),
      }),
    },

    // ---- Pull requests ----
    {
      name: "gitea_list_pull_requests",
      description: "List pull requests for a repository.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        state: { type: "string", description: "open | closed | all (default open)" },
        page: { type: "number", description: "page number (default 1)" },
        limit: { type: "number", description: "how many per page (default 20)" },
      },
      run: async (args) => ({
        pulls: await gitea.listPullRequests(String(args.owner), String(args.repo), {
          state: args.state ? String(args.state) : "open",
          page: String(args.page ? Number(args.page) : 1),
          limit: String(args.limit ? Number(args.limit) : 20),
        }),
      }),
    },
    {
      name: "gitea_get_pull_request",
      description: "Get a single pull request by its number.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        number: { type: "number", description: "the PR number" },
      },
      run: async (args) => ({
        pull: await gitea.getPullRequest(String(args.owner), String(args.repo), Number(args.number)),
      }),
    },
    {
      name: "gitea_create_pull_request",
      description: "Open a pull request from a head branch into a base branch.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        title: { type: "string", description: "the PR title" },
        body: { type: "string", description: "the PR body (markdown)" },
        head: { type: "string", description: "the source branch" },
        base: { type: "string", description: "the target branch (default main)" },
      },
      run: async (args) => ({
        pull: await gitea.createPullRequest(String(args.owner), String(args.repo), {
          title: String(args.title),
          body: args.body ? String(args.body) : undefined,
          head: String(args.head),
          base: args.base ? String(args.base) : "main",
        }),
      }),
    },
    {
      name: "gitea_merge_pull_request",
      description: "Merge a pull request, optionally deleting the source branch afterwards.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        number: { type: "number", description: "the PR number" },
        method: { type: "string", description: "merge | rebase | squash (default merge)" },
        delete_branch: { type: "boolean", description: "delete the source branch after merge (default true)" },
      },
      run: async (args) => {
        const owner = String(args.owner);
        const repo = String(args.repo);
        const number = Number(args.number);
        const method = args.method ? String(args.method) : "merge";
        const deleteBranch = args.delete_branch === undefined ? true : Boolean(args.delete_branch);
        // Read the PR first, so the merged event carries a title and branches, not just a number.
        const pull = await gitea.getPullRequest(owner, repo, number);
        await gitea.mergePullRequest(owner, repo, number, method, deleteBranch);
        await emit("module.gitea.pull.merged", {
          owner,
          repo,
          number,
          title: pull.title,
          head: pull.head,
          base: pull.base,
          method,
          html_url: pull.html_url,
        });
        return { merged: true, number, method, deleted_branch: deleteBranch };
      },
    },

    // ---- Labels ----
    {
      name: "gitea_list_labels",
      description: "List every label defined in a repository.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
      },
      run: async (args) => ({ labels: await gitea.listLabels(String(args.owner), String(args.repo)) }),
    },
    {
      name: "gitea_create_label",
      description: "Create a label in a repository.",
      input: {
        owner: { type: "string", description: "the repository owner" },
        repo: { type: "string", description: "the repository name" },
        name: { type: "string", description: "the label name" },
        color: { type: "string", description: "hex colour, e.g. #0075ca" },
        description: { type: "string", description: "an optional description" },
      },
      run: async (args) => ({
        label: await gitea.createLabel(String(args.owner), String(args.repo), {
          name: String(args.name),
          color: String(args.color),
          description: args.description ? String(args.description) : undefined,
        }),
      }),
    },

    // ---- Escape hatch ----
    {
      name: "gitea_api",
      description: "Make an authenticated Gitea API call for any endpoint without a dedicated tool. Path is relative to /api/v1.",
      input: {
        path: { type: "string", description: "API path relative to /api/v1, e.g. /repos/owner/repo/branches" },
        method: { type: "string", description: "GET | POST | PUT | PATCH | DELETE (default GET)" },
        body: { type: "object", description: "JSON request body for POST/PUT/PATCH" },
      },
      run: async (args) => {
        const method = args.method ? String(args.method) : "GET";
        const result = await gitea.api(String(args.path), {
          method,
          ...(args.body ? { body: JSON.stringify(args.body) } : {}),
        });
        return { result };
      },
    },
  ];
}

// The tools exist only when a token can be found; without one, gitea contributes none rather than
// failing the whole runtime.
registerModuleTools("gitea", (env) => {
  try {
    return getGiteaTools(GiteaClient.fromEnv(env));
  } catch {
    return [];
  }
});