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#!/usr/bin/env python3
"""Install the Kaiju Coder 7 OpenCode provider and lean agent locally."""

from __future__ import annotations

import argparse
import json
import shlex
import shutil
import stat
from pathlib import Path
from typing import Any


ROOT = Path(__file__).resolve().parents[1]
AGENT_SOURCE_CANDIDATES = [
    ROOT / ".opencode/agents/kaiju-coder-7.md",
    ROOT / "agents/kaiju-coder-7.md",
]
CONFIG_SOURCE_CANDIDATES = [
    ROOT / "release/opencode/opencode.kaiju-coder-7.jsonc",
    ROOT / "opencode.kaiju-coder-7.jsonc",
]
PLUGIN_SOURCE_CANDIDATES = [
    ROOT / "scripts/opencode-kaiju-no-autocontinue.mjs",
    ROOT / "opencode-kaiju-no-autocontinue.mjs",
]
COMMAND_SOURCE_CANDIDATES = [
    ROOT / ".opencode/commands/kaiju.md",
    ROOT / "commands/kaiju.md",
]
PLUGIN_DEST_NAME = "kaiju-no-autocontinue.mjs"
RUNTIME_DEST_NAME = "kaiju-coder-7-runtime"
RUNNER_NAME = "kaiju-coder-7-run"
DEFAULT_MODEL = "kaiju/kaiju-coder-7"
DEFAULT_AGENT = "kaiju-coder-7"
RUNTIME_REQUIRED = [
    ROOT / "kaiju_harness",
    ROOT / "prompts",
    ROOT / "scripts/run_kaiju_router.py",
]


def strip_jsonc(text: str) -> str:
    # The template intentionally stays plain JSON-compatible today. This helper
    # keeps the installer tolerant if comments are added later.
    lines = []
    for line in text.splitlines():
        if line.lstrip().startswith("//"):
            continue
        lines.append(line)
    return "\n".join(lines)


def load_json(path: Path) -> dict[str, Any]:
    if not path.exists():
        return {}
    return json.loads(strip_jsonc(path.read_text(encoding="utf-8")))


def write_json(path: Path, data: dict[str, Any]) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(json.dumps(data, indent=2) + "\n", encoding="utf-8")


def write_plugin_package_json(config_dir: Path) -> Path:
    path = config_dir / "package.json"
    data = load_json(path)
    dependencies = dict(data.get("dependencies") or {})
    dependencies.setdefault("@opencode-ai/plugin", "1.14.33")
    data["dependencies"] = dependencies
    write_json(path, data)
    return path


def first_existing(candidates: list[Path], label: str) -> Path:
    for candidate in candidates:
        if candidate.is_file():
            return candidate
    joined = ", ".join(str(candidate) for candidate in candidates)
    raise FileNotFoundError(f"Missing {label}. Looked in: {joined}")


def plugin_list(value: Any) -> list[str]:
    if isinstance(value, str):
        return [value]
    if isinstance(value, list):
        return [item for item in value if isinstance(item, str)]
    return []


def runtime_available() -> bool:
    return all(path.exists() for path in RUNTIME_REQUIRED)


def ignore_runtime_junk(_directory: str, names: list[str]) -> set[str]:
    return {
        name
        for name in names
        if name == "__pycache__" or name.endswith(".pyc") or name == ".DS_Store"
    }


def copy_runtime(runtime_dest: Path) -> None:
    if not runtime_available():
        missing = ", ".join(str(path) for path in RUNTIME_REQUIRED if not path.exists())
        raise FileNotFoundError(f"Missing Kaiju router runtime file(s): {missing}")

    shutil.rmtree(runtime_dest, ignore_errors=True)
    (runtime_dest / "scripts").mkdir(parents=True, exist_ok=True)
    shutil.copytree(ROOT / "kaiju_harness", runtime_dest / "kaiju_harness", ignore=ignore_runtime_junk)
    shutil.copytree(ROOT / "prompts", runtime_dest / "prompts", ignore=ignore_runtime_junk)
    shutil.copy2(ROOT / "scripts/run_kaiju_router.py", runtime_dest / "scripts/run_kaiju_router.py")


def write_runner(runner_dest: Path, runtime_dest: Path) -> None:
    runner_dest.parent.mkdir(parents=True, exist_ok=True)
    runtime_arg = shlex.quote(str(runtime_dest))
    script_arg = shlex.quote(str(runtime_dest / "scripts/run_kaiju_router.py"))
    content = f"""#!/usr/bin/env bash
set -euo pipefail

RUNTIME_DIR={runtime_arg}
PYTHON_BIN="${{KAIJU_PYTHON:-python3}}"
BASE_URL="${{KAIJU_OPENAI_BASE_URL:-http://127.0.0.1:18181/v1}}"
MODEL="${{KAIJU_MODEL:-kaiju-coder-7}}"
PLANNER_TIMEOUT="${{KAIJU_PLANNER_TIMEOUT:-45}}"

if [ ! -f {script_arg} ]; then
  echo "Kaiju Coder 7 runtime is missing: $RUNTIME_DIR" >&2
  exit 2
fi

exec "$PYTHON_BIN" {script_arg} \\
  --openai-base-url "$BASE_URL" \\
  --model "$MODEL" \\
  --planner-timeout "$PLANNER_TIMEOUT" \\
  "$@"
"""
    runner_dest.write_text(content, encoding="utf-8")
    runner_dest.chmod(runner_dest.stat().st_mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)


def merge_provider(
    existing: dict[str, Any],
    template: dict[str, Any],
    base_url: str | None,
    plugin_path: Path,
    *,
    set_defaults: bool,
) -> dict[str, Any]:
    merged = dict(existing)
    provider = dict(merged.get("provider") or {})
    kaiju = dict((template.get("provider") or {})["kaiju"])
    if base_url:
        options = dict(kaiju.get("options") or {})
        options["baseURL"] = base_url
        kaiju["options"] = options
    provider["kaiju"] = kaiju
    merged["$schema"] = merged.get("$schema") or template.get("$schema", "https://opencode.ai/config.json")
    merged["provider"] = provider
    plugins = plugin_list(merged.get("plugin"))
    plugin_path_str = str(plugin_path)
    if plugin_path_str not in plugins:
        plugins.append(plugin_path_str)
    merged["plugin"] = plugins
    if set_defaults:
        merged["model"] = DEFAULT_MODEL
        merged["default_agent"] = DEFAULT_AGENT
    return merged


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument(
        "--config-dir",
        type=Path,
        default=Path.home() / ".config/opencode",
        help="OpenCode config directory to update.",
    )
    parser.add_argument("--base-url", default=None, help="Override Kaiju OpenAI-compatible base URL.")
    parser.add_argument(
        "--bin-dir",
        type=Path,
        default=Path.home() / ".local/bin",
        help="Directory where the kaiju-coder-7-run command is installed.",
    )
    parser.add_argument("--skip-runner", action="store_true", help="Install only the OpenCode provider, agent, and plugin.")
    parser.add_argument(
        "--no-defaults",
        action="store_true",
        help="Do not set Kaiju Coder 7 as the default OpenCode model and default agent.",
    )
    parser.add_argument("--dry-run", action="store_true")
    args = parser.parse_args()

    config_path = args.config_dir / "opencode.jsonc"
    agent_dest = args.config_dir / "agents/kaiju-coder-7.md"
    plugin_dest = args.config_dir / PLUGIN_DEST_NAME
    command_dest = args.config_dir / "commands/kaiju.md"
    package_dest = args.config_dir / "package.json"
    runtime_dest = args.config_dir / RUNTIME_DEST_NAME
    runner_dest = args.bin_dir / RUNNER_NAME
    agent_source = first_existing(AGENT_SOURCE_CANDIDATES, "Kaiju Coder 7 OpenCode agent")
    config_source = first_existing(CONFIG_SOURCE_CANDIDATES, "Kaiju Coder 7 OpenCode config")
    plugin_source = first_existing(PLUGIN_SOURCE_CANDIDATES, "Kaiju Coder 7 OpenCode loop guard")
    command_source = first_existing(COMMAND_SOURCE_CANDIDATES, "Kaiju Coder 7 OpenCode command")
    if not args.skip_runner and not runtime_available():
        missing = ", ".join(str(path) for path in RUNTIME_REQUIRED if not path.exists())
        raise FileNotFoundError(f"Missing Kaiju router runtime file(s): {missing}")
    existing = load_json(config_path)
    template = load_json(config_source)
    merged = merge_provider(existing, template, args.base_url, plugin_dest, set_defaults=not args.no_defaults)

    print(f"Config: {config_path}")
    print(f"Agent:  {agent_dest}")
    print(f"Plugin: {plugin_dest}")
    print(f"Command: {command_dest}")
    print(f"Package: {package_dest}")
    if not args.skip_runner:
        print(f"Runtime: {runtime_dest}")
        print(f"Runner:  {runner_dest}")
    if args.dry_run:
        print(
            json.dumps(
                {
                    "plugin": merged.get("plugin", []),
                    "model": merged.get("model"),
                    "default_agent": merged.get("default_agent"),
                    "kaiju": merged.get("provider", {}).get("kaiju", {}),
                    "command": str(command_dest),
                    "package": str(package_dest),
                    "package_dependency": "@opencode-ai/plugin",
                    "runtime": None if args.skip_runner else str(runtime_dest),
                    "runner": None if args.skip_runner else str(runner_dest),
                },
                indent=2,
            )
        )
        return 0

    write_json(config_path, merged)
    agent_dest.parent.mkdir(parents=True, exist_ok=True)
    command_dest.parent.mkdir(parents=True, exist_ok=True)
    shutil.copy2(agent_source, agent_dest)
    shutil.copy2(plugin_source, plugin_dest)
    shutil.copy2(command_source, command_dest)
    write_plugin_package_json(args.config_dir)
    if not args.skip_runner:
        copy_runtime(runtime_dest)
        write_runner(runner_dest, runtime_dest)
    print("Installed Kaiju Coder 7 OpenCode profile.")
    if not args.skip_runner:
        print(f"Runner command: {runner_dest}")
    if args.no_defaults:
        print("Run: opencode -m kaiju/kaiju-coder-7 --agent kaiju-coder-7")
    else:
        print("Run: opencode")
    return 0


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