#!/usr/bin/env python3
#
# Generates and updates snapshot test cases from packse scenarios.
#
# Usage:
#
#     $ scripts/scenarios/update.py
#
# Requirements:
#
#   Requires `packse` and `chevron-blue`.
#
#     $ pip install -r scripts/scenarios/requirements.txt
#
#   Also supports a local, editable requirement on `packse`.
#
#   Uses `git`, `rustfmt`, and `cargo insta test` requirements from the project.

import json
import shutil
import subprocess
import sys
from pathlib import Path

TOOL_ROOT = Path(__file__).parent
TEMPLATE = TOOL_ROOT / "template.mustache"
PACKSE = TOOL_ROOT / "packse-scenarios"
REQUIREMENTS = TOOL_ROOT / "requirements.txt"
PROJECT_ROOT = TOOL_ROOT.parent.parent
TARGET = PROJECT_ROOT / "crates" / "puffin-cli" / "tests" / "pip_install_scenarios.rs"

try:
    import packse
except ImportError:
    print(
        f"missing requirement `packse`: install the requirements at {REQUIREMENTS.relative_to(PROJECT_ROOT)}",
        file=sys.stderr,
    )
    exit(1)


try:
    import chevron_blue
except ImportError:
    print(
        f"missing requirement `chevron-blue`: install the requirements at {REQUIREMENTS.relative_to(PROJECT_ROOT)}",
        file=sys.stderr,
    )
    exit(1)


if packse.__development_base_path__.name != "packse":
    # Not a local editable installation, download latest scenarios
    if PACKSE.exists():
        shutil.rmtree(PACKSE)

    print("Downloading scenarios from packse repository...", file=sys.stderr)
    # Perform a sparse checkout where we only grab the `scenarios` folder
    subprocess.check_call(
        [
            "git",
            "clone",
            "-n",
            "--depth=1",
            "--filter=tree:0",
            "https://github.com/zanieb/packse",
            str(PACKSE),
        ],
        cwd=TOOL_ROOT,
        stdout=subprocess.DEVNULL,
        stderr=subprocess.STDOUT,
    )
    subprocess.check_call(
        ["git", "sparse-checkout", "set", "--no-cone", "scenarios"],
        cwd=PACKSE,
        stdout=subprocess.DEVNULL,
        stderr=subprocess.STDOUT,
    )
    subprocess.check_call(
        ["git", "checkout"],
        cwd=PACKSE,
        stdout=subprocess.DEVNULL,
        stderr=subprocess.STDOUT,
    )
    scenarios_path = str(PACKSE / "scenarios")
else:
    print("Using local packse scenarios...", file=sys.stderr)
    scenarios_path = str(packse.__development_base_path__ / "scenarios")


print("Loading scenario metadata...", file=sys.stderr)
data = json.loads(
    subprocess.check_output(
        [
            "packse",
            "inspect",
            scenarios_path,
        ],
    )
)

# Add a generated note
data["generated_by"] = f"Generated by `{' '.join(sys.argv)}`"

# Add normalized names for tests
for scenario in data["scenarios"]:
    scenario["normalized_name"] = scenario["name"].replace("-", "_")

# Drop the example scenario
for index, scenario in enumerate(data["scenarios"]):
    if scenario["name"] == "example":
        data["scenarios"].pop(index)

# Render the template
print("Rendering template...", file=sys.stderr)
output = chevron_blue.render(template=TEMPLATE.read_text(), data=data, no_escape=True)

# Update the test file
print(f"Updating test file at `{TARGET.relative_to(PROJECT_ROOT)}`...", file=sys.stderr)
with open(TARGET, "wt") as target_file:
    target_file.write(output)

# Format
print("Formatting test file...", file=sys.stderr)
subprocess.check_call(["rustfmt", str(TARGET)])

# Update snapshots
print("Updating snapshots...\n", file=sys.stderr)
subprocess.call(
    [
        "cargo",
        "insta",
        "test",
        "--accept",
        "--test",
        TARGET.with_suffix("").name,
        "--features",
        "pypi,python",
    ],
    cwd=PROJECT_ROOT,
)

print("\nDone!", file=sys.stderr)