#!/usr/bin/env python3
"""Regenerate CMakePresets.json - one uniform pipeline per chip.

The tiers reimplement the ATmega328P-only reference protocol, so that is the
whole chip list. It stays a generated file rather than a hand-written one
because the shape - configure, build, test, workflow, and a reflect pair
without tests - is the shape a second chip would need too.

Run from the repo root: tools/make_presets.py - or with --check, which
verifies the committed file matches this generator and edits nothing (the
ctest entry `presets.generated` runs that, so drift reds the gate).
"""

import json
import os
import sys

CHIPS = [
    "atmega328p",
]

# The reflect pair: the same chip, built in libavr's other mode.
REFLECT_SPOT = [
    "atmega328p",
]


def main():
    configure = [{
        "name": "base",
        "hidden": True,
        "generator": "Ninja",
        "binaryDir": "${sourceDir}/build/${presetName}",
        "toolchainFile": "${sourceDir}/libavr/cmake/avr-toolchain.cmake",
        "cacheVariables": {
            "CMAKE_BUILD_TYPE": "Release",
            "CMAKE_EXPORT_COMPILE_COMMANDS": "ON",
            "CMAKE_COLOR_DIAGNOSTICS": "ON",
        },
    }]
    build, test, workflows = [], [], []

    def add(chip, mode):
        name = f"{chip}-{mode}"
        configure.append({
            "name": name,
            "inherits": "base",
            "cacheVariables": {
                "LIBAVR_MCU": chip,
                "LIBAVR_REFLECT": "ON" if mode == "reflect" else "OFF",
            },
        })
        build.append({"name": name, "configurePreset": name})
        steps = [{"type": "configure", "name": name}, {"type": "build", "name": name}]
        if mode == "generated":
            test.append({"name": name, "configurePreset": name, "output": {"outputOnFailure": True}})
            steps.append({"type": "test", "name": name})
        workflows.append({"name": name, "steps": steps})

    for chip in CHIPS:
        add(chip, "generated")
    for chip in REFLECT_SPOT:
        add(chip, "reflect")

    # CMake rejects unknown fields in the presets root, $comment included, so
    # the file cannot carry a generated-file marker; the --check ctest is the
    # whole of rule 10's guard here.
    presets = {
        "version": 8,
        "configurePresets": configure,
        "buildPresets": build,
        "testPresets": test,
        "workflowPresets": workflows,
    }
    rendered = json.dumps(presets, indent=1) + "\n"
    path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "CMakePresets.json")
    if "--check" in sys.argv[1:]:
        current = open(path).read() if os.path.exists(path) else ""
        if current != rendered:
            print("CMakePresets.json does not match its generator - run tools/make_presets.py")
            return 1
        return 0
    with open(path, "w") as f:
        f.write(rendered)
    print(f"{len(CHIPS)} chips, {len(REFLECT_SPOT)} reflect: {os.path.normpath(path)}")
    return 0


if __name__ == "__main__":
    sys.exit(main())