from __future__ import annotations

import argparse
from pathlib import Path
import sys

from .activation import (
    ActivationStep,
    activation_steps,
    blocked_steps,
    write_activation_artifacts,
)
from .audit import audit_gateway
from .build import build_gateway
from .config import load_config
from .docsgen import generate_docs
from .manifest import write_fixture_manifests
from .plan import plan_gateway, write_plan_artifacts
from .platforms import PLATFORM_NAMES, platform_by_name
from .preview import PreviewServers, preview_endpoints, write_preview_fixture_manifests
from .route_manifest import (
    load_route_manifest,
    route_manifest_schema_json,
    validate_route_manifest,
)
from .route_policy import RouteExposure, RouteIssue, route_exposures, route_issues
from .selection import protocols_for_selection, select_profile, select_protocols
from .status import DoctorIssue, TransportStatus, doctor_gateway, gateway_status


def main(argv: list[str] | None = None) -> int:
    parser = argparse.ArgumentParser(prog="ampg")
    parser.add_argument(
        "--config",
        type=Path,
        default=Path("gateway.toml"),
        help="Path to gateway TOML config.",
    )
    subcommands = parser.add_subparsers(dest="command", required=True)
    plan_parser = subcommands.add_parser("plan", help="Print a dry-run plan.")
    _add_target_selection(plan_parser)
    plan_parser.add_argument(
        "--write-artifacts",
        action="store_true",
        help="Write generated config snippets to the configured plan root.",
    )
    status_parser = subcommands.add_parser(
        "status",
        help="Show enabled transport daemon decisions.",
    )
    _add_target_selection(status_parser)
    status_parser.add_argument(
        "--platform",
        choices=PLATFORM_NAMES,
        help="Override platform detection for dry-run checks.",
    )
    doctor_parser = subcommands.add_parser(
        "doctor",
        help="Check source, renderer, route, and daemon readiness.",
    )
    _add_target_selection(doctor_parser)
    doctor_parser.add_argument(
        "--platform",
        choices=PLATFORM_NAMES,
        help="Override platform detection for dry-run checks.",
    )
    apply_parser = subcommands.add_parser(
        "apply",
        help="Show or run the transport activation sequence.",
    )
    _add_target_selection(apply_parser)
    apply_parser.add_argument(
        "--dry-run",
        action="store_true",
        help="Print the activation sequence without changing services.",
    )
    apply_parser.add_argument(
        "--write-artifacts",
        action="store_true",
        help="Write generated config snippets to the configured plan root.",
    )
    apply_parser.add_argument(
        "--platform",
        choices=PLATFORM_NAMES,
        help="Override platform detection for dry-run checks.",
    )
    build_parser = subcommands.add_parser("build", help="Build enabled protocol outputs.")
    _add_target_selection(build_parser)
    fixture_parser = subcommands.add_parser("manifest", help="Write AMPB fixture manifests.")
    _add_target_selection(fixture_parser)
    preview_parser = subcommands.add_parser("preview", help="Preview generated outputs locally.")
    preview_subcommands = preview_parser.add_subparsers(dest="preview_command", required=True)
    for preview_command in ("endpoints", "manifest", "serve"):
        command_parser = preview_subcommands.add_parser(
            preview_command,
            help=f"Preview {preview_command} for generated outputs.",
        )
        _add_target_selection(command_parser)
        command_parser.add_argument(
            "--base-port",
            type=int,
            default=19080,
            help="First loopback port assigned to enabled protocol outputs.",
        )
        command_parser.add_argument(
            "--host",
            default="127.0.0.1",
            help="Loopback host for preview URLs.",
        )
    routes_parser = subcommands.add_parser("routes", help="Explain route exposure policy.")
    routes_subcommands = routes_parser.add_subparsers(dest="routes_command", required=True)
    routes_explain = routes_subcommands.add_parser(
        "explain",
        help="Print per-protocol route decisions.",
    )
    _add_target_selection(routes_explain)
    routes_validate = routes_subcommands.add_parser(
        "validate",
        help="Fail when a public route has no compatible enabled protocol.",
    )
    _add_target_selection(routes_validate)
    manifest_parser = subcommands.add_parser(
        "route-manifest",
        help="Validate or print the app route manifest contract.",
    )
    manifest_subcommands = manifest_parser.add_subparsers(
        dest="route_manifest_command",
        required=True,
    )
    manifest_validate = manifest_subcommands.add_parser(
        "validate",
        help="Validate an ampg.route-manifest.v1 JSON file.",
    )
    manifest_validate.add_argument("path", type=Path, help="Route manifest JSON path.")
    manifest_schema = manifest_subcommands.add_parser(
        "schema",
        help="Print the JSON Schema for route manifests.",
    )
    manifest_schema.add_argument(
        "--output",
        type=Path,
        help="Write the JSON Schema to this path instead of stdout.",
    )
    audit_parser = subcommands.add_parser("audit", help="Audit source HTML quality.")
    audit_parser.add_argument(
        "--fail-on-warn",
        action="store_true",
        help="Exit non-zero when warnings are found.",
    )
    docs_parser = subcommands.add_parser("docs", help="Generate or check generated docs.")
    docs_subcommands = docs_parser.add_subparsers(dest="docs_command", required=True)
    docs_generate = docs_subcommands.add_parser("generate", help="Generate docs from code.")
    docs_generate.add_argument(
        "--check",
        action="store_true",
        help="Fail if generated docs are stale instead of writing them.",
    )

    args = parser.parse_args(argv)

    try:
        if args.command == "docs":
            return _cmd_docs(args)
        if args.command == "route-manifest":
            return _cmd_route_manifest(args)
        config = _selected_config(load_config(args.config), args)
        if args.command == "plan":
            return _cmd_plan(config, write_artifacts=_write_artifacts_enabled(config, args))
        if args.command == "status":
            return _cmd_status(config, args)
        if args.command == "doctor":
            return _cmd_doctor(config, args)
        if args.command == "apply":
            return _cmd_apply(config, args)
        if args.command == "build":
            return _cmd_build(config)
        if args.command == "manifest":
            return _cmd_manifest(config)
        if args.command == "preview":
            return _cmd_preview(config, args)
        if args.command == "routes":
            return _cmd_routes(config, args)
        if args.command == "audit":
            return _cmd_audit(config, fail_on_warn=args.fail_on_warn)
    except Exception as exc:  # noqa: BLE001 - CLI should print concise failures.
        print(f"AMPG status=error message={exc}", file=sys.stderr)
        return 1
    return 1


def _cmd_apply(config, args) -> int:
    if not args.dry_run:
        print(
            'AMPG_APPLY status=error message="live apply is not implemented; rerun with --dry-run"',
            file=sys.stderr,
        )
        return 1

    if _write_artifacts_enabled(config, args):
        for path in write_activation_artifacts(config):
            print(f"AMPG_APPLY_ARTIFACT path={path} status=written")

    steps = activation_steps(config, platform_provider=_platform_override(config, args))
    for step in steps:
        _print_activation_step(step)

    blocked = blocked_steps(steps)
    print(
        "AMPG_APPLY_SUMMARY "
        "mode=dry-run "
        f"sites={len(config.sites)} "
        f"steps={len(steps)} "
        f"ready={sum(1 for step in steps if step.status == 'ready')} "
        f"review={sum(1 for step in steps if step.status == 'review')} "
        f"planned={sum(1 for step in steps if step.status == 'planned')} "
        f"blocked={len(blocked)}"
    )
    return 1 if blocked else 0


def _add_target_selection(parser) -> None:
    parser.add_argument(
        "--profile",
        help="Named deployment profile from gateway config.",
    )
    parser.add_argument(
        "--protocol",
        action="append",
        default=[],
        help="Limit this command to one protocol. May be repeated or comma-separated.",
    )


def _selected_config(config, args):
    protocols = protocols_for_selection(
        config,
        raw_protocols=getattr(args, "protocol", None),
        profile_name=getattr(args, "profile", None),
    )
    return select_protocols(config, protocols)


def _write_artifacts_enabled(config, args) -> bool:
    if getattr(args, "write_artifacts", False):
        return True
    profile = select_profile(config, getattr(args, "profile", None))
    return bool(profile and profile.write_artifacts)


def _cmd_status(config, args) -> int:
    statuses = gateway_status(config, platform_provider=_platform_override(config, args))
    for status in statuses:
        _print_transport_status(status)
    print(
        "AMPG_STATUS_SUMMARY "
        f"sites={len(config.sites)} "
        f"protocols={len(statuses)} "
        f"ok={sum(1 for status in statuses if status.status == 'ok')} "
        f"warnings={sum(1 for status in statuses if status.status == 'warn')} "
        f"errors={sum(1 for status in statuses if status.status == 'error')}"
    )
    return 0


def _cmd_doctor(config, args) -> int:
    platform_provider = _platform_override(config, args)
    statuses = gateway_status(config, platform_provider=platform_provider)
    issues = doctor_gateway(config, platform_provider=platform_provider, statuses=statuses)
    for status in statuses:
        _print_transport_status(status)
    for issue in issues:
        _print_doctor_issue(issue)
    errors = sum(1 for issue in issues if issue.severity == "error")
    warnings = sum(1 for issue in issues if issue.severity == "warning")
    print(
        "AMPG_DOCTOR_SUMMARY "
        f"sites={len(config.sites)} "
        f"checks={len(statuses) + len(issues)} "
        f"warnings={warnings} "
        f"errors={errors}"
    )
    return 1 if errors else 0


def _cmd_plan(config, *, write_artifacts: bool) -> int:
    for line in plan_gateway(config):
        artifact_text = ",".join(str(path) for path in line.artifacts) if line.artifacts else "-"
        print(
            "AMPG_PLAN "
            f"site={line.site_id} "
            f"protocol={line.protocol} "
            f"renderer={line.renderer} "
            f"output={line.output_root} "
            f"daemon={line.daemon} "
            f"policy={line.daemon_policy} "
            f"artifacts={artifact_text} "
            f"action=\"{line.action}\""
        )
    if write_artifacts:
        artifacts = write_plan_artifacts(config)
        for artifact in artifacts:
            print(f"AMPG_ARTIFACT path={artifact.path}")
    return 0


def _cmd_build(config) -> int:
    for result in build_gateway(config):
        extra = ""
        if result.privacy_stats is not None:
            stats = result.privacy_stats
            extra = (
                f" removed_active_tags={stats.removed_active_tags}"
                f" removed_event_handlers={stats.removed_event_handlers}"
                f" removed_inline_styles={stats.removed_inline_styles}"
                f" removed_remote_assets={stats.removed_remote_assets}"
            )
        print(
            "AMPG_BUILD "
            f"site={result.site_id} "
            f"protocol={result.protocol} "
            f"renderer={result.renderer} "
            f"output={result.output_root} "
            f"files={result.files_written}"
            f" skipped={result.files_skipped}"
            f"{extra}"
        )
    for manifest in write_fixture_manifests(config):
        print(
            "AMPG_MANIFEST "
            f"site={manifest.site_id} "
            f"path={manifest.path} "
            f"fixtures={manifest.fixture_count}"
        )
    return 0


def _print_activation_step(step: ActivationStep) -> None:
    print(
        "AMPG_APPLY_STEP "
        f"site={step.site_id} "
        f"protocol={step.protocol} "
        f"stage={step.stage} "
        f"action={step.action} "
        f"target={step.target} "
        f"status={step.status} "
        f"message=\"{_quote(step.message)}\""
    )


def _print_transport_status(status: TransportStatus) -> None:
    executable_path = status.executable_path or "-"
    print(
        "AMPG_STATUS "
        f"site={status.site_id} "
        f"protocol={status.protocol} "
        f"renderer={status.renderer} "
        f"daemon={status.daemon} "
        f"policy={status.daemon_policy} "
        f"platform={status.platform} "
        f"supervisor={status.supervisor} "
        f"adapter={status.adapter} "
        f"backend={status.backend} "
        f"installed={_bool(status.installed)} "
        f"running={_bool(status.running)} "
        f"adoptable={_bool(status.adoptable)} "
        f"manageable={_bool(status.manageable)} "
        f"executable={executable_path} "
        f"status={status.status} "
        f"action={status.action} "
        f"message=\"{_quote(status.message)}\""
    )


def _print_doctor_issue(issue: DoctorIssue) -> None:
    print(
        "AMPG_DOCTOR "
        f"site={issue.site_id} "
        f"protocol={issue.protocol} "
        f"severity={issue.severity} "
        f"code={issue.code} "
        f"message=\"{_quote(issue.message)}\""
    )


def _cmd_manifest(config) -> int:
    for manifest in write_fixture_manifests(config):
        print(
            "AMPG_MANIFEST "
            f"site={manifest.site_id} "
            f"path={manifest.path} "
            f"fixtures={manifest.fixture_count}"
        )
    return 0


def _cmd_preview(config, args) -> int:
    endpoints = preview_endpoints(config, base_port=args.base_port, host=args.host)
    if args.preview_command == "endpoints":
        for endpoint in endpoints:
            _print_preview_endpoint(endpoint)
        print(
            "AMPG_PREVIEW_SUMMARY "
            f"sites={len(config.sites)} endpoints={len(endpoints)}"
        )
        return 0

    if args.preview_command == "manifest":
        for endpoint in endpoints:
            _print_preview_endpoint(endpoint)
        for result in write_preview_fixture_manifests(
            config,
            base_port=args.base_port,
            host=args.host,
        ):
            print(
                "AMPG_PREVIEW_MANIFEST "
                f"site={result.site_id} "
                f"path={result.path} "
                f"fixtures={result.fixture_count}"
            )
        return 0

    if args.preview_command == "serve":
        for endpoint in endpoints:
            _print_preview_endpoint(endpoint)
        with PreviewServers(endpoints) as servers:
            print(
                "AMPG_PREVIEW_SERVE "
                f"status=running endpoints={len(servers.endpoints)}"
            )
            servers.wait_forever()
        return 0

    return 1


def _print_preview_endpoint(endpoint) -> None:
    print(
        "AMPG_PREVIEW_ENDPOINT "
        f"site={endpoint.site_id} "
        f"protocol={endpoint.protocol} "
        f"renderer={endpoint.renderer} "
        f"url={endpoint.url} "
        f"root={endpoint.root} "
        f"status={endpoint.status}"
    )


def _cmd_routes(config, args) -> int:
    exposures = route_exposures(config)
    issues = route_issues(config)
    for exposure in exposures:
        _print_route_exposure(exposure)
    for issue in issues:
        _print_route_issue(issue)
    print(
        "AMPG_ROUTE_SUMMARY "
        f"sites={len(config.sites)} "
        f"routes={sum(len(site.interactions.routes) for site in config.sites)} "
        f"decisions={len(exposures)} "
        f"exposed={sum(1 for exposure in exposures if exposure.status == 'exposed')} "
        f"skipped={sum(1 for exposure in exposures if exposure.status == 'skipped')} "
        f"issues={len(issues)}"
    )
    if args.routes_command == "validate" and issues:
        return 1
    return 0


def _cmd_route_manifest(args) -> int:
    if args.route_manifest_command == "schema":
        content = route_manifest_schema_json()
        if args.output:
            args.output.parent.mkdir(parents=True, exist_ok=True)
            args.output.write_text(content, encoding="utf-8")
            print(f"AMPG_ROUTE_MANIFEST_SCHEMA path={args.output}")
        else:
            print(content, end="")
        return 0

    if args.route_manifest_command == "validate":
        try:
            data = load_route_manifest(args.path)
        except ValueError:
            try:
                import json

                data = json.loads(args.path.read_text(encoding="utf-8"))
                issues = validate_route_manifest(data)
            except Exception as exc:  # noqa: BLE001 - CLI should print concise failures.
                print(
                    "AMPG_ROUTE_MANIFEST "
                    f"path={args.path} status=error message=\"{exc}\"",
                    file=sys.stderr,
                )
                return 1
            for issue in issues:
                print(
                    "AMPG_ROUTE_MANIFEST_ISSUE "
                    f"path={args.path} json_path={issue.path} "
                    f"code={issue.code} message=\"{issue.message}\""
                )
            print(
                "AMPG_ROUTE_MANIFEST "
                f"path={args.path} status=fail issues={len(issues)}"
            )
            return 1

        print(
            "AMPG_ROUTE_MANIFEST "
            f"path={args.path} schema={data['schema']} routes={len(data['routes'])} status=ok"
        )
        return 0

    return 1


def _print_route_exposure(exposure: RouteExposure) -> None:
    print(
        "AMPG_ROUTE "
        f"site={exposure.site_id} "
        f"protocol={exposure.protocol} "
        f"route_index={exposure.route_index} "
        f"route=\"{exposure.match}\" "
        f"source={exposure.source} "
        f"tier={exposure.tier} "
        f"identity={exposure.identity} "
        f"payments={exposure.payments} "
        f"realtime={str(exposure.realtime).lower()} "
        f"public_allowed={str(exposure.public_allowed).lower()} "
        f"max_tier={exposure.max_tier} "
        f"status={exposure.status} "
        f"reason=\"{exposure.reason}\""
    )


def _print_route_issue(issue: RouteIssue) -> None:
    print(
        "AMPG_ROUTE_ISSUE "
        f"site={issue.site_id} "
        f"route_index={issue.route_index} "
        f"route=\"{issue.match}\" "
        f"source={issue.source} "
        f"tier={issue.tier} "
        f"code={issue.code} "
        f"message=\"{issue.message}\""
    )


def _cmd_audit(config, *, fail_on_warn: bool) -> int:
    issues = audit_gateway(config)
    for issue in issues:
        print(
            "AMPG_AUDIT "
            f"site={issue.site_id} "
            f"severity={issue.severity} "
            f"code={issue.code} "
            f"path={issue.path} "
            f"message=\"{issue.message}\""
        )
    print(f"AMPG_AUDIT_SUMMARY issues={len(issues)}")
    if issues and fail_on_warn:
        return 1
    return 0


def _cmd_docs(args) -> int:
    if args.docs_command == "generate":
        changed = generate_docs(Path.cwd(), check=args.check)
        changed_text = ",".join(str(path) for path in changed) if changed else "-"
        mode = "check" if args.check else "write"
        print(f"AMPG_DOCS status=ok mode={mode} changed={changed_text}")
        return 0
    return 1


def _platform_override(config, args):
    if getattr(args, "platform", None):
        return platform_by_name(args.platform)
    profile = select_profile(config, getattr(args, "profile", None))
    if profile and profile.platform:
        return platform_by_name(profile.platform)
    return None


def _bool(value: bool) -> str:
    return str(value).lower()


def _quote(value: str) -> str:
    return value.replace("\\", "\\\\").replace('"', '\\"')