import { registerTool } from './registry';
import { ToolContext } from './context';

const SKILL_FILE = 'SKILL.md';
const SKILLS_DIR = '.skills';

async function giteaGetContents(repo: string, path: string, ctx: ToolContext): Promise<any> {
    const res = await fetch(`${ctx.gitea.apiUrl}/api/v1/repos/${repo}/contents/${path}`, {
        headers: { 'Authorization': `token ${ctx.gitea.apiToken}` }
    });
    if (!res.ok) return null;
    return res.json();
}

registerTool({
    name: 'list_skills',
    description: `List available skills for a project repo. Skills are stored in .skills/<name>/SKILL.md and provide reusable instructions the agent should follow (e.g. deploy process, test commands, code conventions).`,
    parameters: {
        type: 'object',
        properties: {
            repo: { type: 'string', description: 'Repo in "owner/name" format' }
        },
        required: ['repo']
    },
    async handler(args, ctx) {
        const repo = String(args.repo);
        const contents = await giteaGetContents(repo, SKILLS_DIR, ctx);
        if (!contents || !Array.isArray(contents)) {
            return { skills: [], message: `No .skills/ directory found in ${repo}` };
        }
        const skills = contents
            .filter((entry: any) => entry.type === 'dir')
            .map((entry: any) => ({ name: entry.name, path: entry.path }));
        return { repo, skills };
    }
});

registerTool({
    name: 'get_skill',
    description: `Read the full content of a specific skill from a project repo. Call list_skills first to see what's available. Use this before spawning agents so they have the relevant project-specific instructions.`,
    parameters: {
        type: 'object',
        properties: {
            repo: { type: 'string', description: 'Repo in "owner/name" format' },
            skill_name: { type: 'string', description: 'Skill name (directory name inside .skills/)' }
        },
        required: ['repo', 'skill_name']
    },
    async handler(args, ctx) {
        const repo = String(args.repo);
        const skillName = String(args.skill_name);
        const filePath = `${SKILLS_DIR}/${skillName}/${SKILL_FILE}`;
        const file = await giteaGetContents(repo, filePath, ctx);
        if (!file || !file.content) {
            return { error: `Skill "${skillName}" not found in ${repo}. Try list_skills to see available skills.` };
        }
        const content = Buffer.from(file.content, 'base64').toString('utf8');
        // Strip YAML frontmatter if present, return just the markdown body
        const body = content.replace(/^---[\s\S]*?---\s*/m, '').trim();
        return { repo, skill: skillName, content: body };
    }
});