from __future__ import annotations

from .shared import *

class TaskBriefTemplatesMixin:
    @classmethod
    def _project_root_candidates(cls) -> list[Path]:
        service_file = Path(__file__).resolve()
        cwd = Path.cwd().resolve()
        raw_candidates = [
            service_file.parents[3],
            service_file.parents[2],
            cwd,
            cwd.parent,
        ]
        deduped: list[Path] = []
        seen: set[str] = set()
        for path in raw_candidates:
            key = str(path)
            if key in seen:
                continue
            seen.add(key)
            deduped.append(path)
        return deduped

    @staticmethod
    def _safe_dict(value: Any) -> dict[str, Any]:
        if isinstance(value, dict):
            try:
                # 深拷贝，避免浅拷贝触发 JSON 嵌套对象原地修改导致的“提交不落库”。
                return json.loads(json.dumps(value))
            except Exception:
                return dict(value)
        if isinstance(value, str):
            try:
                parsed = json.loads(value)
                return parsed if isinstance(parsed, dict) else {}
            except Exception:
                return {}
        return {}

    @classmethod
    def _project_root(cls) -> Path:
        for root in cls._project_root_candidates():
            if (root / "docs" / "architecture").exists():
                return root
        return cls._project_root_candidates()[0]

    @staticmethod
    def _normalize_template_text(content: str) -> str:
        return "\n".join(line.rstrip() for line in str(content or "").strip().splitlines()).strip()

    @classmethod
    def _is_default_template_fallback(cls, content: str) -> bool:
        return cls._normalize_template_text(content) == cls._normalize_template_text(DEFAULT_TEMPLATE_FALLBACK)

    @classmethod
    def _load_default_template_content(cls) -> str:
        template_path = cls._project_root() / "docs/architecture/TASK_BRIEF_TEMPLATE.md"
        if template_path.exists():
            try:
                return template_path.read_text(encoding="utf-8").strip() or DEFAULT_TEMPLATE_FALLBACK
            except Exception:
                return DEFAULT_TEMPLATE_FALLBACK
        return DEFAULT_TEMPLATE_FALLBACK

    @classmethod
    def _resolve_git_ref(cls, ref: str) -> str:
        try:
            output = subprocess.check_output(
                ["git", "rev-parse", "--short", ref],
                cwd=str(cls._project_root()),
                stderr=subprocess.DEVNULL,
                text=True,
                timeout=1.5,
            ).strip()
            return output or "-"
        except Exception:
            return "-"

    @staticmethod
    def _to_markdown_list(items: list[str], *, empty_text: str) -> str:
        cleaned = [str(item).strip() for item in items if str(item).strip()]
        if not cleaned:
            return f"- {empty_text}"
        return "\n".join(f"- {item}" for item in cleaned)

    @classmethod
    def _render_template_content(
        cls,
        *,
        template_content: str,
        generated_at: str,
        base_ref: str,
        head_ref: str,
        changed_files: list[str],
        scope_summary: str,
        risks: list[str],
    ) -> str:
        content = str(template_content or "").strip() or cls._load_default_template_content()
        replacements = {
            "{{GENERATED_AT}}": str(generated_at or "-"),
            "{{BASE_REF}}": str(base_ref or "-"),
            "{{HEAD_REF}}": str(head_ref or "-"),
            "{{CHANGED_FILES}}": cls._to_markdown_list(changed_files, empty_text="(none)"),
            "{{SCOPE_SUMMARY}}": str(scope_summary or "-"),
            "{{RISKS}}": cls._to_markdown_list(risks, empty_text="待补充风险评估"),
        }
        rendered = content
        for token, value in replacements.items():
            rendered = rendered.replace(token, value)
        return rendered.strip()

    @classmethod
    def _build_default_template(cls) -> dict[str, Any]:
        now_text = now_cn_naive().isoformat()
        return {
            "id": DEFAULT_TEMPLATE_ID,
            "name": DEFAULT_TEMPLATE_NAME,
            "description": DEFAULT_TEMPLATE_DESCRIPTION,
            "content": cls._load_default_template_content(),
            "updated_at": now_text,
            "updated_by": 0,
            "created_at": now_text,
        }

    @staticmethod
    def _build_template_item(
        *,
        template_id: str,
        name: str,
        description: str,
        content: str,
        now_text: str,
    ) -> dict[str, Any]:
        return {
            "id": template_id,
            "name": name,
            "description": description,
            "content": content,
            "updated_at": now_text,
            "updated_by": 0,
            "created_at": now_text,
        }

    @classmethod
    def _build_system_templates(cls) -> list[dict[str, Any]]:
        now_text = now_cn_naive().isoformat()
        return [
            cls._build_default_template(),
            cls._build_template_item(
                template_id=LOW_TEMPLATE_ID,
                name=LOW_TEMPLATE_NAME,
                description=LOW_TEMPLATE_DESCRIPTION,
                content=LOW_TEMPLATE_CONTENT,
                now_text=now_text,
            ),
            cls._build_template_item(
                template_id=HIGH_TEMPLATE_ID,
                name=HIGH_TEMPLATE_NAME,
                description=HIGH_TEMPLATE_DESCRIPTION,
                content=HIGH_TEMPLATE_CONTENT,
                now_text=now_text,
            ),
            cls._build_template_item(
                template_id=HIGH_CONTRACT_TEMPLATE_ID,
                name=HIGH_CONTRACT_TEMPLATE_NAME,
                description=HIGH_CONTRACT_TEMPLATE_DESCRIPTION,
                content=HIGH_CONTRACT_TEMPLATE_CONTENT,
                now_text=now_text,
            ),
        ]

    @classmethod
    def _ensure_system_templates(
        cls,
        templates: list[dict[str, Any]],
    ) -> tuple[list[dict[str, Any]], bool]:
        merged = [item for item in templates if isinstance(item, dict)]
        known_ids = {str(item.get("id") or "").strip() for item in merged if str(item.get("id") or "").strip()}
        changed = False
        for preset in cls._build_system_templates():
            template_id = str(preset.get("id") or "").strip()
            if not template_id or template_id in known_ids:
                continue
            merged.append(preset)
            known_ids.add(template_id)
            changed = True
        return merged, changed