from __future__ import annotations

import base64
import textwrap


HELLO_WORKER_SCRIPT = r'''
import json
import os
from datetime import datetime, timezone
from pathlib import Path


def now():
    return datetime.now(timezone.utc).isoformat()


def write_json(path: Path, payload: dict):
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(json.dumps(payload, indent=2, ensure_ascii=False) + "\n", encoding="utf-8")


def append_event(path: Path, step: str, status: str, message: str, data: dict | None = None):
    path.parent.mkdir(parents=True, exist_ok=True)
    event = {
        "ts": now(),
        "step": step,
        "status": status,
        "message": message,
        "data": data or {},
    }
    line = json.dumps(event, ensure_ascii=False)
    with path.open("a", encoding="utf-8") as f:
        f.write(line + "\n")
    # Keep HF Job logs useful as well as Bucket events.
    print(line, flush=True)


def main():
    run_id = os.environ["RUN_ID"]
    hf_username = os.environ.get("HF_USERNAME", "unknown")
    bucket_source = os.environ.get("BUCKET_SOURCE", "unknown")
    output_root = Path(os.environ.get("OUTPUT_ROOT", "/output"))
    job_id = os.environ.get("JOB_ID")
    accelerator = os.environ.get("ACCELERATOR") or "none"
    cpu_cores = os.environ.get("CPU_CORES")
    memory = os.environ.get("MEMORY")
    has_hf_token = bool(os.environ.get("HF_TOKEN"))

    run_dir = output_root / "runs" / run_id
    state_path = run_dir / "state.json"
    events_path = run_dir / "events.jsonl"
    report_path = run_dir / "report.md"

    append_event(events_path, "bootstrap", "started", "HF Job started")
    append_event(
        events_path,
        "environment",
        "success",
        "Collected non-sensitive job environment metadata",
        {
            "job_id": job_id,
            "accelerator": accelerator,
            "cpu_cores": cpu_cores,
            "memory": memory,
            "has_hf_token": has_hf_token,
        },
    )

    state = {
        "run_id": run_id,
        "status": "success",
        "kind": "hello_job",
        "message": "Hello from HF Job. OAuth → Job → Bucket write succeeded.",
        "created_at": now(),
        "updated_at": now(),
        "created_by": hf_username,
        "bucket_source": bucket_source,
        "job_id": job_id,
        "accelerator": accelerator,
        "cpu_cores": cpu_cores,
        "memory": memory,
        "has_hf_token": has_hf_token,
        "security_notes": [
            "HF_TOKEN was not printed.",
            "This run does not create or publish any repository.",
            "The bucket should remain private.",
        ],
    }
    write_json(state_path, state)
    append_event(events_path, "state_write", "success", "Wrote state.json")

    report = f"""# Agentic Space Factory — Hello Job Report

Run ID: `{run_id}`

Status: **success**

This first worker validated the critical foundation:

```text
OAuth user → HF Job → mounted Storage Bucket → state/events/report write
```

## Non-sensitive job metadata

- Job ID: `{job_id}`
- User: `{hf_username}`
- Bucket: `{bucket_source}`
- Accelerator: `{accelerator}`
- CPU cores: `{cpu_cores}`
- Memory: `{memory}`
- HF token present in job env: `{has_hf_token}`

## Security posture

- The token was passed as a secret and was not printed.
- This run did not create or modify any Hugging Face repository.
- This run did not publish anything publicly.

## Next implementation step

The next increment should create a private target Gradio Space and validate it with `gradio_client` before reporting success.
"""
    report_path.write_text(report, encoding="utf-8")
    append_event(events_path, "report_write", "success", "Wrote report.md")
    append_event(events_path, "done", "success", "Hello Job completed")


if __name__ == "__main__":
    main()
'''


CREATE_SPACE_WORKER_SCRIPT = r'''
import json
import os
import re
import subprocess
import sys
import time
from datetime import datetime, timezone
from pathlib import Path
from textwrap import dedent


TARGET_RE = re.compile(r"^[A-Za-z0-9][A-Za-z0-9._-]{1,95}/[A-Za-z0-9][A-Za-z0-9._-]{1,95}$")


def now():
    return datetime.now(timezone.utc).isoformat()


def write_json(path: Path, payload: dict):
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(json.dumps(payload, indent=2, ensure_ascii=False) + "\n", encoding="utf-8")


def append_event(path: Path, step: str, status: str, message: str, data: dict | None = None):
    path.parent.mkdir(parents=True, exist_ok=True)
    event = {"ts": now(), "step": step, "status": status, "message": message, "data": data or {}}
    line = json.dumps(event, ensure_ascii=False)
    with path.open("a", encoding="utf-8") as f:
        f.write(line + "\n")
    # Keep HF Job logs useful as well as Bucket events.
    print(line, flush=True)


def fail(run_dir: Path, events_path: Path, message: str, details: dict | None = None, status: str = "failed"):
    state_path = run_dir / "state.json"
    append_event(events_path, "failure", "failed", message, details or {})
    write_json(state_path, {
        "run_id": os.environ.get("RUN_ID"),
        "kind": "create_private_space",
        "status": status,
        "message": message,
        "updated_at": now(),
        "details": details or {},
    })
    report = f"""# Agentic Space Factory — Private Space Creation Report

Status: **{status}**

{message}

```json
{json.dumps(details or {}, indent=2, ensure_ascii=False)}
```
"""
    (run_dir / "report.md").write_text(report, encoding="utf-8")
    raise SystemExit(1)


def pip_install(events_path: Path):
    append_event(events_path, "dependencies", "started", "Installing worker dependencies")
    cmd = [sys.executable, "-m", "pip", "install", "-q", "--upgrade", "huggingface_hub>=1.0.0", "gradio_client>=2.0.0"]
    result = subprocess.run(cmd, text=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    if result.returncode != 0:
        append_event(events_path, "dependencies", "failed", "Dependency installation failed", {"output_tail": result.stdout[-4000:]})
        raise RuntimeError(result.stdout)
    append_event(events_path, "dependencies", "success", "Worker dependencies installed")


def target_files(target_space_id: str) -> dict[str, str]:
    app_py = dedent(f"""
    import gradio as gr


    def greet(name: str) -> str:
        name = (name or "friend").strip() or "friend"
        return f"Hello {{name}} — this private Space was generated by Agentic Space Factory."


    demo = gr.Interface(
        fn=greet,
        inputs=gr.Textbox(label="Name", value="Hugging Face"),
        outputs=gr.Textbox(label="Result"),
        title="Generated private Space",
        description="A minimal Gradio Space created by an HF Job, then validated through the live Gradio API.",
        examples=[["Hugging Face"], ["Agentic Space Factory"]],
    )


    if __name__ == "__main__":
        demo.launch()
    """).strip() + "\n"

    readme = dedent(f"""
    ---
    title: Generated Private Space
    emoji: 🧪
    colorFrom: blue
    colorTo: purple
    sdk: gradio
    app_file: app.py
    python_version: "3.11"
    pinned: false
    ---

    # Generated Private Space

    This private Space was generated by **Agentic Space Factory**.

    Target repo: `{target_space_id}`

    This Phase 2 version intentionally creates only a safe hello-world Gradio app.
    Later phases will add Pi, model-card analysis, ZeroGPU templates, and automatic repair.
    """).strip() + "\n"

    requirements = "gradio>=5.0.0\n"
    return {"app.py": app_py, "README.md": readme, "requirements.txt": requirements}


def save_generated_files(run_dir: Path, files: dict[str, str]):
    generated_dir = run_dir / "generated"
    generated_dir.mkdir(parents=True, exist_ok=True)
    for filename, content in files.items():
        (generated_dir / filename).write_text(content, encoding="utf-8")


def create_and_upload_space(api, token: str, target_space_id: str, files: dict[str, str], events_path: Path):
    append_event(events_path, "create_space", "started", f"Creating private target Space {target_space_id}")
    try:
        api.create_repo(
            repo_id=target_space_id,
            repo_type="space",
            space_sdk="gradio",
            private=True,
            exist_ok=False,
            token=token,
        )
        append_event(events_path, "create_space", "success", "Private target Space created", {"target_space": target_space_id})
    except Exception as exc:
        # If it already exists, fail safely instead of overwriting user resources unexpectedly.
        append_event(events_path, "create_space", "failed", "Could not create target Space", {"error": str(exc)})
        raise

    append_event(events_path, "upload_files", "started", "Uploading generated files to target Space")
    for path_in_repo, content in files.items():
        api.upload_file(
            path_or_fileobj=content.encode("utf-8"),
            path_in_repo=path_in_repo,
            repo_id=target_space_id,
            repo_type="space",
            token=token,
        )
        append_event(events_path, "upload_files", "success", f"Uploaded {path_in_repo}")


def make_gradio_client(target_space_id: str, token: str):
    """Create a Gradio Client across gradio_client versions.

    gradio_client 2.x uses `token=...`; older/newer docs often mention
    `hf_token=...`; some versions expose `api_key` or `headers`. Using
    signature introspection prevents a permanent wait loop on a TypeError.
    """
    import inspect
    from gradio_client import Client

    params = inspect.signature(Client).parameters
    if "token" in params:
        return Client(target_space_id, token=token)
    if "hf_token" in params:
        return Client(target_space_id, hf_token=token)
    if "api_key" in params:
        return Client(target_space_id, api_key=token)
    if "headers" in params:
        return Client(target_space_id, headers={"Authorization": f"Bearer {token}"})
    # Last-resort fallback: if the process is logged in via HF_TOKEN/HF CLI,
    # some client versions can pick credentials from the environment/cache.
    return Client(target_space_id)


def get_api_schema(client):
    try:
        return client.view_api(return_format="dict")
    except TypeError:
        return client.view_api()


def extract_api_names(api_schema) -> list[str]:
    """Best-effort extraction across gradio_client schema formats.

    Gradio/Gradio Client versions differ: an Interface can expose `/predict`,
    `/greet`, or another named endpoint. For the generated hello app the live
    Job logs show `/greet`, so validation must discover endpoints instead of
    hardcoding `/predict`.
    """
    names: list[str] = []

    def add(value):
        if not value or not isinstance(value, str):
            return
        name = value if value.startswith("/") else f"/{value}"
        if name not in names:
            names.append(name)

    def walk(obj):
        if isinstance(obj, dict):
            for key, value in obj.items():
                if key in {"api_name", "apiName"}:
                    add(value)
                # Some schemas use endpoint paths as keys, for example `/greet`.
                if isinstance(key, str) and key.startswith("/"):
                    add(key)
                walk(value)
        elif isinstance(obj, list):
            for item in obj:
                walk(item)

    walk(api_schema)
    return names


def predict_with_available_endpoint(client, api_schema, value: str):
    candidates = extract_api_names(api_schema)
    for fallback in ["/greet", "/predict"]:
        if fallback not in candidates:
            candidates.append(fallback)

    errors = []
    for api_name in candidates:
        try:
            return api_name, client.predict(value, api_name=api_name)
        except Exception as exc:
            errors.append({"api_name": api_name, "error": str(exc)[-500:]})

    # Last fallback for old/simple gradio_client versions where api_name may be optional.
    try:
        return None, client.predict(value)
    except Exception as exc:
        errors.append({"api_name": None, "error": str(exc)[-500:]})
        raise RuntimeError(f"No candidate Gradio endpoint worked: {json.dumps(errors, ensure_ascii=False)}")


def validate_live_api(target_space_id: str, token: str, events_path: Path, tests_dir: Path, timeout_seconds: int = 360):
    tests_dir.mkdir(parents=True, exist_ok=True)
    deadline = time.time() + timeout_seconds
    last_error = None
    attempt = 0
    append_event(events_path, "api_validation", "started", "Waiting for live Gradio API to become available")

    while time.time() < deadline:
        attempt += 1
        try:
            client = make_gradio_client(target_space_id, token)
            api_schema = get_api_schema(client)
            api_names = extract_api_names(api_schema)
            write_json(tests_dir / "api_schema.json", {"schema": api_schema, "api_names": api_names})
            used_api_name, result = predict_with_available_endpoint(client, api_schema, "Agentic Space Factory")
            result_text = str(result)
            ok = "Agentic Space Factory" in result_text and "Hello" in result_text
            payload = {
                "attempt": attempt,
                "target_space": target_space_id,
                "api_test_passed": ok,
                "api_name": used_api_name,
                "discovered_api_names": api_names,
                "result": result_text,
                "validated_at": now(),
            }
            write_json(tests_dir / "test_result.json", payload)
            if ok:
                append_event(
                    events_path,
                    "api_validation",
                    "success",
                    "Live Gradio API test passed",
                    {"attempt": attempt, "api_name": used_api_name, "discovered_api_names": api_names},
                )
                return payload
            last_error = f"Unexpected API result from {used_api_name}: {result_text}"
        except Exception as exc:
            last_error = str(exc)
            append_event(events_path, "api_validation", "waiting", "Live API not ready yet", {"attempt": attempt, "error": last_error[-1000:]})
        time.sleep(20)

    payload = {
        "target_space": target_space_id,
        "api_test_passed": False,
        "error": last_error,
        "validated_at": now(),
    }
    write_json(tests_dir / "test_result.json", payload)
    raise RuntimeError(f"Live API validation did not pass before timeout: {last_error}")


def main():
    run_id = os.environ["RUN_ID"]
    hf_username = os.environ.get("HF_USERNAME", "unknown")
    bucket_source = os.environ.get("BUCKET_SOURCE", "unknown")
    output_root = Path(os.environ.get("OUTPUT_ROOT", "/output"))
    target_space_id = os.environ["TARGET_SPACE_ID"]
    token = os.environ.get("HF_TOKEN")

    run_dir = output_root / "runs" / run_id
    events_path = run_dir / "events.jsonl"
    state_path = run_dir / "state.json"
    report_path = run_dir / "report.md"
    target_json_path = run_dir / "target_space.json"

    append_event(events_path, "bootstrap", "started", "Private Space creation worker started")
    write_json(state_path, {
        "run_id": run_id,
        "kind": "create_private_space",
        "status": "running",
        "message": "Creating private target Space",
        "target_space": target_space_id,
        "created_by": hf_username,
        "bucket_source": bucket_source,
        "created_at": now(),
        "updated_at": now(),
    })

    if not token:
        fail(run_dir, events_path, "HF_TOKEN is missing from Job secrets")
    if not TARGET_RE.match(target_space_id):
        fail(run_dir, events_path, "Invalid TARGET_SPACE_ID", {"target_space": target_space_id})
    if not target_space_id.startswith(f"{hf_username}/"):
        fail(run_dir, events_path, "For Phase 2, target Space must be in the signed-in user's namespace", {"target_space": target_space_id, "username": hf_username})

    try:
        pip_install(events_path)
        from huggingface_hub import HfApi

        api = HfApi(token=token)
        whoami = api.whoami(token=token)
        append_event(events_path, "auth", "success", "Authenticated inside Job", {"whoami_name": whoami.get("name")})

        files = target_files(target_space_id)
        save_generated_files(run_dir, files)
        append_event(events_path, "generate_files", "success", "Generated minimal Gradio Space files", {"files": list(files)})

        create_and_upload_space(api, token, target_space_id, files, events_path)
        write_json(target_json_path, {
            "target_space": target_space_id,
            "url": f"https://huggingface.co/spaces/{target_space_id}",
            "private": True,
            "sdk": "gradio",
            "created_by": hf_username,
        })

        validation = validate_live_api(target_space_id, token, events_path, run_dir / "tests")

        final_state = {
            "run_id": run_id,
            "kind": "create_private_space",
            "status": "success",
            "message": "Private Gradio Space created and validated through the live API.",
            "target_space": target_space_id,
            "target_space_url": f"https://huggingface.co/spaces/{target_space_id}",
            "created_by": hf_username,
            "bucket_source": bucket_source,
            "validation": validation,
            "updated_at": now(),
            "security_notes": [
                "The target Space was created as private.",
                "The HF token was not printed or written to report files.",
                "Success was declared only after a live Gradio API test passed.",
            ],
        }
        write_json(state_path, final_state)

        report = f"""# Agentic Space Factory — Private Space Creation Report

Run ID: `{run_id}`

Status: **success**

Created private Space: [`{target_space_id}`](https://huggingface.co/spaces/{target_space_id})

## What happened

```text
OAuth user → HF Job → private Space creation → file upload → live Gradio API validation → Bucket report
```

## Generated files

- `app.py`
- `requirements.txt`
- `README.md`

Copies are stored in:

```text
runs/{run_id}/generated/
```

## Live API validation

```json
{json.dumps(validation, indent=2, ensure_ascii=False)}
```

## Security posture

- The target Space was created as private.
- No token was printed or intentionally persisted.
- Success was declared only after the live Gradio API returned the expected output.

## Next step

Phase 3 should introduce Pi inside the Job and ask it to modify/repair this simple Space while preserving the live API validation gate.
"""
        report_path.write_text(report, encoding="utf-8")
        append_event(events_path, "report_write", "success", "Wrote report.md")
        append_event(events_path, "done", "success", "Private Space creation worker completed")
    except Exception as exc:
        fail(run_dir, events_path, "Private Space creation worker failed", {"error": str(exc)})


if __name__ == "__main__":
    main()
'''


def _encode(script: str) -> str:
    return base64.b64encode(script.encode("utf-8")).decode("ascii")


def encoded_worker_script() -> str:
    """Return the base64-encoded Phase 1 hello worker script."""
    return _encode(HELLO_WORKER_SCRIPT)


def encoded_create_space_worker_script() -> str:
    """Return the base64-encoded Phase 2 private Space creation worker script."""
    return _encode(CREATE_SPACE_WORKER_SCRIPT)


def python_decode_and_run_command() -> list[str]:
    """Command list for `run_job`.

    The Job image only needs Python. The script is passed via env as base64 and
    executed from /tmp, which avoids persisting code or exposing secrets.
    """
    runner = textwrap.dedent(
        """
        import base64, os, pathlib, subprocess, sys
        script = base64.b64decode(os.environ['WORKER_SCRIPT_B64']).decode('utf-8')
        path = pathlib.Path('/tmp/space_factory_worker.py')
        path.write_text(script, encoding='utf-8')
        raise SystemExit(subprocess.call([sys.executable, str(path)]))
        """
    ).strip()
    return ["python", "-c", runner]