import base64
import json
from pathlib import Path
from typing import Dict, List

import requests

from app.settings import settings

DATA_DIR = Path(__file__).resolve().parent.parent / "data"


def _load_json(filename: str) -> Dict:
    path = DATA_DIR / filename
    with open(path, encoding="utf-8") as file:
        return json.load(file)


def _sort_builds(builds: List[Dict]) -> List[Dict]:
    return sorted(builds, key=lambda build: build.get("number", 0), reverse=True)

def normalize_build(build: Dict) -> Dict:
    changes = build.get("changeSets", [])
    commits = []

    for cs in changes:
        for item in cs.get("items", []):
            commits.append({
                "commit": item.get("commitId", "")[:7],
                "message": item.get("msg", ""),
                "author": item.get("author", {}).get("fullName", "unknown"),
            })

    return {
        "number": build.get("number"),
        "status": (build.get("result") or "RUNNING").lower(),
        "finished_at": build.get("timestamp"),
        "duration_seconds": build.get("duration", 0) // 1000,
        "url": build.get("url"),
        "commits": commits,
    }


def _auth_header() -> Dict[str, str]:
    token = f"{settings.jenkins_user}:{settings.jenkins_token}"
    encoded = base64.b64encode(token.encode()).decode()
    return {"Authorization": f"Basic {encoded}"}

def fetch_builds(limit: int = 5) -> List[Dict]:
    url = (
        f"{settings.jenkins_base_url}/job/{settings.jenkins_job_name}/api/json"
        "?tree=builds[number,url,result,timestamp,duration,"
        "changesets[items[commitId,msg,author[fullName]]]]"
    )

    resp = requests.get(url, headers = _auth_header(), timeout=5)
    resp.raise_for_status()

    builds = resp.json().get("builds", [])
    return builds[:limit]

def build_history() -> Dict:
    """Return Jenkins build history data."""
    history = _load_json("build_history.json")
    builds = history.get("builds", [])
    return {
        "builds": [normalize_build(b) for b in builds]
    }