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

- New channel id only (domains unchanged vs last out/domains.json):
  copy web/<channel>/ + patch secondary packs; leave sync/ alone.
- Domains changed (or first run / no sync yet):
  reset sync/ from source and run full patch_all.

Domains default from Laravel config (系统设置 / CORUNA_CHANNEL_DOMAINS),
used for both Deployment and Reporting pools.
"""

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"
SERVER_ROOT = LAB_ROOT / "server"
APPLY_ROOT = SERVER_ROOT / "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 load_json(path: Path) -> dict | None:
    if not path.is_file():
        return None
    return json.loads(path.read_text())


def domains_equal(prev: dict | None, dep: list[str], rep: list[str]) -> bool:
    if not prev or prev.get("mode") != "fixed_domains":
        return False
    return (
        prev.get("deployment", {}).get("domains") == dep
        and prev.get("reporting", {}).get("domains") == rep
    )


def seeds_from_domains(dep: list[str], rep: list[str]) -> tuple[str, str]:
    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 load_domains_from_laravel() -> list[str]:
    """Read coruna.channel_domains (settings override env) via artisan."""
    php_candidates = [
        Path("/opt/homebrew/opt/php/bin/php"),
        Path("/usr/bin/php"),
        Path(shutil.which("php") or ""),
    ]
    php = next((p for p in php_candidates if p and p.is_file()), None)
    artisan = SERVER_ROOT / "artisan"
    if php is None or not artisan.is_file():
        return []

    proc = subprocess.run(
        [str(php), str(artisan), "coruna:channel-domains", "--json"],
        cwd=str(SERVER_ROOT),
        capture_output=True,
        text=True,
        check=False,
    )
    if proc.returncode != 0:
        print(f"warn: coruna:channel-domains failed: {proc.stderr.strip()}", file=sys.stderr)
        return []
    line = (proc.stdout or "").strip().splitlines()
    if not line:
        return []
    try:
        data = json.loads(line[-1])
    except json.JSONDecodeError:
        return []
    if not isinstance(data, list):
        return []
    return [str(x).strip() for x in data if str(x).strip()]


def resolve_domains(cli_dep: list[str], cli_rep: list[str]) -> tuple[list[str], list[str]]:
    if cli_dep or cli_rep:
        if bool(cli_dep) != bool(cli_rep):
            raise SystemExit("provide both --deployment-domains and --reporting-domains, or neither")
        return (
            parse_domain_list(cli_dep, label="deployment"),
            parse_domain_list(cli_rep, label="reporting"),
        )

    domains = load_domains_from_laravel()
    if not domains:
        raise SystemExit(
            "no domains in Laravel config (系统设置 → 投放域名 / CORUNA_CHANNEL_DOMAINS). "
            "Configure domains first, or pass --deployment-domains / --reporting-domains."
        )
    # Same configured hosts for both pools (product default).
    return domains, list(domains)


def main() -> int:
    parser = argparse.ArgumentParser(
        description=(
            "Create web/<channel-id>/ from source. "
            "If domains match the previous project, only patch secondary (sync untouched). "
            "If domains changed, rebuild sync/ via patch_all."
        )
    )
    parser.add_argument(
        "--channel-id",
        help="optional 32-char [0-9a-z] channel id (default: random, unique under web/)",
    )
    parser.add_argument(
        "--deployment-domains",
        action="append",
        default=[],
        help="override Deployment hosts (default: Laravel coruna.channel_domains)",
    )
    parser.add_argument(
        "--reporting-domains",
        action="append",
        default=[],
        help="override Reporting hosts (default: same as deployment from config)",
    )
    parser.add_argument("--deployment-seed", help="optional; default: reuse or derive")
    parser.add_argument("--reporting-seed", help="optional; default: reuse or derive")
    parser.add_argument(
        "--force-sync",
        action="store_true",
        help="rebuild sync/ even when domains match the previous project",
    )
    parser.add_argument(
        "-n",
        "--count",
        type=int,
        default=5,
        help="DGA candidates for patch_all when rebuilding sync (default 5)",
    )
    args = parser.parse_args()

    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)

    fixed_dep, fixed_rep = resolve_domains(args.deployment_domains, args.reporting_domains)
    prev_domains = load_json(out_root / "domains.json")
    prev_seeds = load_json(out_root / "seeds.json") or {}
    sync_ready = sync_dir.is_dir() and (sync_dir / "daily.html").is_file()
    same_domains = (
        domains_equal(prev_domains, fixed_dep, fixed_rep)
        and sync_ready
        and not args.force_sync
    )

    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"domains:  {'reuse sync (channel-only)' if same_domains else 'rebuild sync'}")
    print(f"  deployment: {', '.join(fixed_dep)}")
    print(f"  reporting:  {', '.join(fixed_rep)}")
    print()

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

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

    py = sys.executable

    if same_domains:
        dep = args.deployment_seed or prev_seeds.get("deployment_seed")
        rep = args.reporting_seed or prev_seeds.get("reporting_seed")
        if not dep or not rep:
            dep, rep = seeds_from_domains(fixed_dep, fixed_rep)
            print("seeds: derived (out/seeds.json incomplete)")
        print("=== domains unchanged: patch secondary only (sync untouched) ===")
        print(f"reuse/derive seeds dep={dep} rep={rep}")
        run(
            [
                py,
                str(TOOLS / "patch_secondary_packs.py"),
                "--deployment-seed",
                str(dep),
                "--reporting-seed",
                str(rep),
                "--channel-id",
                channel,
                *domain_args,
                "--root",
                str(APPLY_ROOT),
                "--apply",
            ]
        )
        (out_root / "channel.json").write_text(
            json.dumps(
                {
                    "channel_id": channel,
                    "patched": True,
                    "sync_rebuilt": False,
                    "deployment_seed": dep,
                    "reporting_seed": rep,
                    "deployment_domains": fixed_dep,
                    "reporting_domains": fixed_rep,
                },
                indent=2,
            )
            + "\n"
        )
    else:
        print("=== domains new/changed (or no sync): reset sync + full patch ===")
        replace_tree(src_sync, sync_dir)
        print(f"copied sync/ -> {sync_dir}")
        cmd = [
            py,
            str(TOOLS / "patch_all.py"),
            "--apply",
            "--root",
            str(APPLY_ROOT),
            "--channel-id",
            channel,
            "-n",
            str(args.count),
            *domain_args,
        ]
        if args.deployment_seed:
            cmd += ["--deployment-seed", args.deployment_seed]
        if args.reporting_seed:
            cmd += ["--reporting-seed", args.reporting_seed]
        print()
        print("=== patch_all --apply ===")
        run(cmd)
        seeds = load_json(out_root / "seeds.json") or {}
        (out_root / "channel.json").write_text(
            json.dumps(
                {
                    "channel_id": channel,
                    "patched": True,
                    "sync_rebuilt": True,
                    "deployment_seed": seeds.get("deployment_seed"),
                    "reporting_seed": seeds.get("reporting_seed"),
                    "deployment_domains": fixed_dep,
                    "reporting_domains": fixed_rep,
                },
                indent=2,
            )
            + "\n"
        )

    print()
    print("=== ready ===")
    print(f"web:     {campaign_dir}")
    print(f"sync:    {sync_dir} ({'unchanged' if same_domains else 'rebuilt'})")
    print(f"channel: {out_root / 'channel.json'}")
    print(f"domains: {out_root / 'domains.json'}")
    print()
    print(f"served: /web/{channel}/support.html")
    if not same_domains:
        print("         /sync/daily.html")
    return 0


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