"""What the site tells an AI agent about itself.

- ``llms.txt`` (https://llmstxt.org): the pages and data an agent should
  read first, in Markdown, at the site's root.
- ``skills/setup-bios/SKILL.md``: an Agent Skill that sets up a device's
  BIOS files with the fewest downloads.
- ``ard.json``: an Agentic Resource Discovery manifest
  (https://github.com/ards-project/ard-spec) listing that skill and the
  JSON API, linked from every page's head with ``rel="ard"``.

Both are written from the registry at each build, so a new platform or a
moved page cannot leave them stale. The WebMCP tools a page registers live
in website/src/scripts/agent-tools.ts.
"""

from __future__ import annotations

import json
from collections.abc import Callable
from pathlib import Path

SITE = "https://abdess.github.io/retrobios/"
PUBLISHER = "abdess.github.io"
SH = "curl -fsSL https://abdess.github.io/retrobios/i | sh -s --"
PS = "& ([scriptblock]::Create((irm https://abdess.github.io/retrobios/i.ps1)))"
# What a folder put into a command may not hold, as agent-tools.ts refuses
# it: PowerShell also ends a single-quoted string on the typographic quotes.
REFUSED = "any quote, straight or typographic (' \" ‘ ’ ‚ ‛ “ ” „), a backtick or a control character"
QUOTING = (f"A folder goes in single quotes, attached to its option. One that holds {REFUSED}, "
           "or starts with `-`, is a question for the user, never a value to escape into the "
           "command. On a page of the site, the `device_setup_command` WebMCP tool writes the "
           "command and refuses such a folder.")

START_PAGES = (
    ("Which pack do I need", "which-pack/", "pick a device or setup, get the folder its BIOS files go in, "
                                            "one command that installs and checks them, or a ZIP pack"),
    ("First install", "wiki/first-install/", "the steps from nothing to a working BIOS folder"),
    ("What are BIOS files", "wiki/what-are-bios-files/", "why emulators need them and where they come from"),
    ("Troubleshooting", "wiki/troubleshooting/", "a file the emulator does not find or refuses"),
    ("Common questions", "wiki/faq/", "short answers"),
)

DATA = (
    ("API index", "api/v1/index.json", "every dataset of the JSON API, versioned"),
    ("Catalog", "api/v1/catalog.json", "each dataset, manifest, export and download with its size, SHA-256 and schema"),
    ("Emulators", "api/v1/emulators.json", "every emulator profile: the files it reads, required or not, "
                                           "their hashes and the source line that reads each. One document "
                                           "per emulator at api/v1/emulators/<id>.json"),
    ("Core names", "api/v1/cores.json", "each core name and alias, with the profile it designates"),
    ("Systems", "api/v1/systems.json", "each system id, its name and the section holding its files"),
    ("Platforms", "api/v1/platforms.json", "each setup (RetroArch, Batocera...), its BIOS folder and files"),
    ("Hash lookup", "api/v1/lookup/00.json", "what a hash (MD5, SHA-1, SHA-256, CRC32) designates, sharded "
                                             "by its first two hex characters: api/v1/lookup/<xx>.json"),
)

MORE = (
    ("Emulators", "emulators/", "one page per emulator"),
    ("Systems", "systems/", "one page per console maker, every file with its hashes"),
    ("Installer", "wiki/installer/", "every option of install.py"),
    ("What we count", "wiki/privacy/", "the site's cookie-free counting"),
    ("Is it legal?", "wiki/legal/", "the project's position"),
    ("Contributing", "contributing/", "add a missing file or an emulator profile"),
)


def llms_txt(platforms: list[tuple[str, str]]) -> str:
    """The site's llms.txt. ``platforms`` lists (id, display name) of every
    registered setup, each with its page."""
    lines = [
        "# RetroBIOS",
        "",
        "> BIOS and firmware files for emulators, each checked against the emulator's source "
        "code: which files an emulator reads, whether it starts without them, where each one "
        "goes on every setup, their hashes, and an installer that puts them in place.",
        "",
        "Every claim about a file cites the line of emulator source code that reads it. The "
        "files themselves are served by the GitHub repository "
        "(https://github.com/Abdess/retrobios) and its releases.",
        "",
        "## Answering a user",
        "",
        *(f"- {rule}" for rule in ANSWER_RULES),
        "",
        "## Setting up a device for its user",
        "",
        "Most people want to play now, with the fewest files. The installer does that in one "
        "command: it finds the setup and its BIOS folder, reads the games on the card, and with "
        "`--for-games --required-only` installs only the files those games cannot start "
        "without. `--yes` alone installs what the card's games need, optional files "
        "included, and `--all-files` the setup's whole list (gigabytes).",
        "",
        f"1. Preview, nothing written: `{SH} --for-games --required-only --dry-run`",
        f"2. Install, no questions: `{SH} --for-games --required-only --yes`",
        f"3. On Windows (PowerShell): `{PS} --for-games --required-only --yes`",
        "",
        "- Run it on the device itself (its terminal or SSH), or on a computer with the device's "
        "card plugged in. The installer recognises the handheld systems on the card, among them "
        "ArkOS, dArkOS, ArchR and UnofficialOS (R36S and its clones), muOS, KNULLI, ROCKNIX, "
        "AmberELEC, EmuELEC, Onion, spruceOS and MinUI. "
        "The [Linux handhelds page](" + SITE + "platforms/linux-handhelds/) maps each device "
        "to its system and folder.",
        "- From a computer, if the card is not found, name its BIOS folder: `--dest='<card>/bios'` "
        "(ArkOS and dArkOS: the `bios` folder of the EASYROMS part).",
        "- A games folder somewhere else: `--for-games='<folder>'`, one subfolder per system.",
        f"- {QUOTING}",
        "- Later, to see what is missing or wrong: `--check`. Machine-readable progress: "
        "`--events` (JSON lines, one per event, documented on the installer page).",
        "- A game the installer cannot identify gets every BIOS of its system, and the run names it.",
        f"- The same steps as an Agent Skill: [SKILL.md]({SITE}{SKILL_PATH}).",
        "",
        "## Start",
        "",
        *(f"- [{title}]({SITE}{path}): {what}" for title, path, what in START_PAGES),
        "",
        "## Setups",
        "",
        *(f"- [{name}]({SITE}platforms/{pid}/): its BIOS folder and files" for pid, name in platforms),
        "",
        "## Data",
        "",
        *(f"- [{title}]({SITE}{path}): {what}" for title, path, what in DATA),
        "",
        "## Optional",
        "",
        *(f"- [{title}]({SITE}{path}): {what}" for title, path, what in MORE),
    ]
    return "\n".join(lines) + "\n"


# How an assistant answers from the site and not from memory: file names,
# folders and hashes change with each setup, and a guessed one is the
# answer that fails. The same rules end the skill.
ANSWER_RULES = (
    "Answer from the pages and data, not from memory. Every page has a Markdown copy: add "
    "`index.md` to its address (https://abdess.github.io/retrobios/which-pack/index.md). "
    f"[llms-full.txt]({SITE}llms-full.txt) holds the guides and every setup's page in one file.",
    "Name files exactly as the pages write them: names are case-sensitive on most devices, and a renamed file is "
    "not found. Never invent a file name, a folder or a hash.",
    "The BIOS folder depends on the setup, and for RetroArch on the device: give the folder the "
    "setup's page names, under \"Where the files go\".",
    "To check a file the user has, compare its MD5 or SHA-1 with the file's card, or look the hash "
    f"up: {SITE}files/?hash=<value> (the page) or api/v1/lookup/<first two hex>.json (the data).",
    "Prefer the installer to a manual copy: it puts each file in its folder and checks its hash. "
    "Give the command the setup's page gives, with `--for-games --required-only` for the fewest files.",
    "Say where an answer comes from: link the page you read.",
    "On a page of the site, the WebMCP tools answer from the data: setup_bios_files (folder and "
    "files of a setup), emulator_bios_files, lookup_bios_hash, device_setup_command, search_retrobios.",
    f"Whether sharing BIOS files is legal depends on the country: point to [Is it legal?]({SITE}wiki/legal/), "
    "do not give legal advice.",
)

SKILL_PATH = "skills/setup-bios/SKILL.md"
# The Agent Skills media type ARD names: Markdown with this profile.
SKILL_TYPE = 'text/markdown; profile="urn:air:agent-skills"'


def skill_md() -> str:
    """An Agent Skill (SKILL.md: YAML front matter, then instructions) that
    sets up a device's BIOS files with the fewest downloads."""
    return "\n".join([
        "---",
        "name: setup-bios",
        "description: Install the BIOS and firmware files a retrogaming device or computer needs "
        "(RetroArch, Batocera, EmuDeck, ArkOS, dArkOS, muOS, KNULLI, ROCKNIX and others), only "
        "what the games on its card need to start. Use when a user asks to set up emulators, "
        "a handheld (R36S, Miyoo, Anbernic), BIOS files or firmware.",
        "---",
        "",
        "# Set up BIOS files with RetroBIOS",
        "",
        "Most users want to play now, with the fewest files. Install only what the games on the "
        "card need, unless the user asks for everything.",
        "",
        "## Steps",
        "",
        "1. Ask where the games are: on the device itself (you have its terminal or SSH), or on "
        "its card plugged into this computer.",
        f"2. Preview, nothing is written: `{SH} --for-games --required-only --dry-run` "
        f"(Windows PowerShell: `{PS} --for-games --required-only --dry-run`).",
        "3. Show the user the plan it prints: the setup found, the BIOS folder, the files and "
        "their size. Ask before going on if the setup or the folder is not the one expected.",
        "4. Install with the same command, `--yes` in place of `--dry-run`.",
        "5. Report the summary line. A game the installer could not identify got every BIOS of "
        "its system: say which.",
        "",
        "## When the setup or the card is not found",
        "",
        "- From a computer, name the card's BIOS folder: `--dest='<card>/bios'`. ArkOS and dArkOS "
        "keep it on the EASYROMS part.",
        "- Games outside the card: `--for-games='<folder>'`, one subfolder per system.",
        "- A setup not detected: `--platform=<name>`, a name exactly as `--list-platforms` prints "
        "it (letters, digits, `-` and `_`).",
        f"- {QUOTING}",
        "",
        "## Later",
        "",
        "- `--check` says what is missing or wrong, without downloading.",
        "- `--events` writes the run as JSON lines, for reading by a program.",
        "",
        "## Answering from the site",
        "",
        *(f"- {rule}" for rule in ANSWER_RULES),
        "",
        f"Every option: {SITE}wiki/installer/. Devices and their folders: "
        f"{SITE}platforms/linux-handhelds/. The site's guide for agents: {SITE}llms.txt.",
        "",
    ])


def ard_manifest() -> dict:
    """The ARD manifest: the setup skill and the JSON API, each with the
    questions it answers. llms.txt is found at the site root, as its
    convention says."""
    return {
        "entries": [
            {
                "identifier": f"urn:air:{PUBLISHER}:retrobios:setup-bios",
                "displayName": "Set up BIOS files with RetroBIOS",
                "type": SKILL_TYPE,
                "url": f"{SITE}{SKILL_PATH}",
                "description": "An agent skill that installs the BIOS files a device needs, only "
                               "what the games on its card need to start.",
                "representativeQueries": [
                    "install the minimum BIOS files for the games on my R36S running dArkOS",
                    "set up BIOS files for RetroArch on my Steam Deck",
                    "my emulator says BIOS missing, fix it",
                ],
                "capabilities": ["SetupBios"],
                "tags": ["bios", "firmware", "emulation", "retrogaming"],
            },
            {
                "identifier": f"urn:air:{PUBLISHER}:retrobios:api",
                "displayName": "RetroBIOS JSON API",
                "type": "application/json",
                "url": f"{SITE}api/v1/index.json",
                "description": "Versioned JSON datasets: emulator profiles, platforms, systems, core "
                               "names and a hash lookup.",
                "representativeQueries": [
                    "what file has the MD5 490f666e1afb15b7362b406ed1cea246",
                    "which files does the beetle_psx core read",
                    "where do PlayStation BIOS files go on Batocera",
                ],
                "capabilities": ["HashLookup", "EmulatorFiles", "PlatformFiles"],
                "tags": ["api", "json", "bios"],
            },
        ]
    }


def write(public: Path, platforms: list[tuple[str, str]],
          write_if_changed: Callable[[str, str], object]) -> None:
    write_if_changed(str(public / "llms.txt"), llms_txt(platforms))
    (public / SKILL_PATH).parent.mkdir(parents=True, exist_ok=True)
    write_if_changed(str(public / SKILL_PATH), skill_md())
    write_if_changed(str(public / "ard.json"), json.dumps(ard_manifest(), indent=1) + "\n")