#!/usr/bin/env python3
"""Build server/public campaign trees: new channel + fixed domains.

Seeds are derived deterministically from the domain lists (not user-facing).
Same domains → same sync/ and same secondary domain patch; only channel differs.

Each run:
  - creates web/<channel-id>/
  - rebuilds sync/ from source + fixed-domain patch
  - leaves other web/<channel>/ dirs intact
"""

from __future__ import annotations

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

from _channel_patch import gen_channel_id, validate_channel_id
from _domain_patch import parse_domain_list

TOOLS = Path(__file__).resolve().parent
LAB_ROOT = TOOLS.parent
SOURCE_ROOT = LAB_ROOT / "source"
APPLY_ROOT = LAB_ROOT / "server" / "public"
ORIGINAL_CHANNEL_ID = "34f5121f572d6742703eb84ec2f866a6"


def _ignore_junk(_dir: str, names: list[str]) -> set[str]:
    skip = {"_bak", "__pycache__", ".DS_Store"}
    return {n for n in names if n in skip or n.endswith(".pyc")}


def replace_tree(src: Path, dst: Path) -> None:
    if dst.exists():
        shutil.rmtree(dst)
    shutil.copytree(src, dst, symlinks=False, ignore=_ignore_junk)


def copy_campaign_template(dst_campaign: Path) -> None:
    src = SOURCE_ROOT / "web" / ORIGINAL_CHANNEL_ID
    if not src.is_dir():
        raise SystemExit(f"missing source campaign: {src}")
    if dst_campaign.exists():
        raise SystemExit(f"campaign already exists: {dst_campaign}")
    shutil.copytree(src, dst_campaign, symlinks=False, ignore=_ignore_junk)


def seeds_from_domains(dep: list[str], rep: list[str]) -> tuple[str, str]:
    """32-hex seeds stable for a given ordered domain list (pool slots still need seeds)."""

    def one(label: str, domains: list[str]) -> str:
        material = label.encode("ascii") + b"\0" + b"\0".join(d.encode("ascii") for d in domains)
        return hashlib.sha256(material).hexdigest()[:32]

    dep_seed = one("deployment", dep)
    rep_seed = one("reporting", rep)
    if dep_seed == rep_seed:
        rep_seed = one("reporting/alt", rep)
    return dep_seed, rep_seed


def pick_channel(explicit: str | None, web_root: Path) -> str:
    channel = validate_channel_id(explicit) if explicit else gen_channel_id()
    while (web_root / channel).exists():
        if explicit:
            raise SystemExit(f"web/{channel} already exists; choose another --channel-id")
        channel = gen_channel_id()
    return channel


def run(cmd: list[str]) -> None:
    print("+", " ".join(cmd), flush=True)
    subprocess.run(cmd, cwd=str(LAB_ROOT), check=True)


def main() -> int:
    parser = argparse.ArgumentParser(
        description=(
            "From source/, create server/public/web/<channel-id>/ with fixed "
            "Deployment/Reporting domains. Seeds are derived from domains "
            "(no --*-seed / no reuse-sync shortcut)."
        )
    )
    parser.add_argument(
        "--channel-id",
        help="optional 32-hex channel id (default: random, unique under web/)",
    )
    parser.add_argument(
        "--deployment-domains",
        action="append",
        default=[],
        required=True,
        help="fixed Deployment hosts (comma-separated or repeatable)",
    )
    parser.add_argument(
        "--reporting-domains",
        action="append",
        default=[],
        required=True,
        help="fixed Reporting hosts (comma-separated or repeatable)",
    )
    args = parser.parse_args()

    fixed_dep = parse_domain_list(args.deployment_domains, label="deployment")
    fixed_rep = parse_domain_list(args.reporting_domains, label="reporting")
    dep_seed, rep_seed = seeds_from_domains(fixed_dep, fixed_rep)

    src_campaign = SOURCE_ROOT / "web" / ORIGINAL_CHANNEL_ID
    src_sync = SOURCE_ROOT / "sync"
    if not src_campaign.is_dir():
        raise SystemExit(f"missing source campaign: {src_campaign}")
    if not src_sync.is_dir():
        raise SystemExit(f"missing source sync: {src_sync}")

    APPLY_ROOT.mkdir(parents=True, exist_ok=True)
    web_root = APPLY_ROOT / "web"
    sync_dir = APPLY_ROOT / "sync"
    out_root = APPLY_ROOT / "out"
    out_root.mkdir(parents=True, exist_ok=True)
    web_root.mkdir(parents=True, exist_ok=True)

    channel = pick_channel(args.channel_id, web_root)
    campaign_dir = web_root / channel

    print("=== new_project ===")
    print(f"channel:  {channel}")
    print(f"web dest: {campaign_dir}")
    print(f"  deployment: {', '.join(fixed_dep)}")
    print(f"  reporting:  {', '.join(fixed_rep)}")
    print(f"  seeds:      derived from domains (stable)")
    print()

    print("=== copy campaign template ===")
    print(f"from: {src_campaign}")
    print(f"to:   {campaign_dir}")
    copy_campaign_template(campaign_dir)
    print(f"created web/{channel}/")

    print("=== reset sync from source ===")
    replace_tree(src_sync, sync_dir)
    print(f"copied sync/ -> {sync_dir}")

    domain_args: list[str] = []
    for item in fixed_dep:
        domain_args += ["--deployment-domains", item]
    for item in fixed_rep:
        domain_args += ["--reporting-domains", item]

    print()
    print("=== patch_all --apply ===")
    run(
        [
            sys.executable,
            str(TOOLS / "patch_all.py"),
            "--apply",
            "--root",
            str(APPLY_ROOT),
            "--channel-id",
            channel,
            "--deployment-seed",
            dep_seed,
            "--reporting-seed",
            rep_seed,
            *domain_args,
        ]
    )

    (out_root / "channel.json").write_text(
        json.dumps(
            {
                "channel_id": channel,
                "deployment_domains": fixed_dep,
                "reporting_domains": fixed_rep,
            },
            indent=2,
        )
        + "\n"
    )

    print()
    print("=== ready ===")
    print(f"web:     {campaign_dir}")
    print(f"sync:    {sync_dir}")
    print(f"channel: {out_root / 'channel.json'}")
    print(f"domains: {out_root / 'domains.json'}")
    print()
    print("served by Laravel public:")
    print(f"  /web/{channel}/support.html")
    print("  /sync/daily.html")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())