"""FlowTracker：编排一次 flow 动作（校验 → hooks → git → 落盘 → 输出）。"""

from __future__ import annotations

from pathlib import Path

from aide.core import output
from aide.core.config import ConfigManager
from aide.flow.errors import FlowError
from aide.flow.git import GitIntegration
from aide.flow.hooks import run_post_commit_hooks, run_pre_commit_hooks
from aide.flow.storage import FlowStorage
from aide.flow.types import FlowStatus, HistoryEntry
from aide.flow.utils import now_iso, now_task_id, normalize_text
from aide.flow.validator import FlowValidator

DEFAULT_PHASES = ["task-optimize", "flow-design", "impl", "verify", "docs", "finish"]


class FlowTracker:
    def __init__(self, root: Path, cfg: ConfigManager):
        self.root = root
        self.cfg = cfg
        self.storage = FlowStorage(root)
        self.git = GitIntegration(root)

    def start(self, phase: str, summary: str) -> bool:
        return self._run(action="start", to_phase=phase, text=summary)

    def next_step(self, summary: str) -> bool:
        return self._run(action="next-step", to_phase=None, text=summary)

    def back_step(self, reason: str) -> bool:
        return self._run(action="back-step", to_phase=None, text=reason)

    def next_part(self, phase: str, summary: str) -> bool:
        return self._run(action="next-part", to_phase=phase, text=summary)

    def back_part(self, phase: str, reason: str) -> bool:
        return self._run(action="back-part", to_phase=phase, text=reason)

    def issue(self, description: str) -> bool:
        return self._run(action="issue", to_phase=None, text=description)

    def error(self, description: str) -> bool:
        return self._run(action="error", to_phase=None, text=description)

    def _run(self, *, action: str, to_phase: str | None, text: str) -> bool:
        try:
            self.storage.ensure_ready()
            config = self.cfg.load_config()
            phases = _get_phases(config)
            validator = FlowValidator(phases)

            normalized_text = normalize_text(text)
            if not normalized_text:
                raise FlowError("文本参数不能为空")

            with self.storage.lock():
                if action == "start":
                    assert to_phase is not None
                    validator.validate_start(to_phase)
                    self.storage.archive_existing_status()
                    status = FlowStatus(
                        task_id=now_task_id(),
                        current_phase=to_phase,
                        current_step=0,
                        started_at=now_iso(),
                        history=[],
                    )
                    updated = self._apply_action(
                        status=status,
                        action=action,
                        from_phase=None,
                        to_phase=to_phase,
                        text=normalized_text,
                        validator=validator,
                    )
                    self.storage.save_status(updated)
                    output.ok(f"任务开始: {to_phase}")
                    run_post_commit_hooks(to_phase=to_phase, action=action)
                    return True

                status = self.storage.load_status()
                if status is None:
                    raise FlowError("未找到流程状态，请先运行：aide flow start <环节名> \"<总结>\"")

                current_phase = status.current_phase
                validator.validate_phase_exists(current_phase)

                if action == "next-part":
                    assert to_phase is not None
                    validator.validate_next_part(current_phase, to_phase)
                elif action == "back-part":
                    assert to_phase is not None
                    validator.validate_back_part(current_phase, to_phase)
                else:
                    to_phase = current_phase

                updated = self._apply_action(
                    status=status,
                    action=action,
                    from_phase=current_phase,
                    to_phase=to_phase,
                    text=normalized_text,
                    validator=validator,
                )
                self.storage.save_status(updated)

                if action == "next-part":
                    output.ok(f"进入环节: {to_phase}")
                elif action == "back-part":
                    output.warn(f"回退到环节: {to_phase}")
                elif action == "error":
                    output.err(f"错误已记录: {normalized_text}")

                run_post_commit_hooks(to_phase=to_phase, action=action)
                return True
        except FlowError as exc:
            output.err(str(exc))
            return False

    def _apply_action(
        self,
        *,
        status: FlowStatus,
        action: str,
        from_phase: str | None,
        to_phase: str,
        text: str,
        validator: FlowValidator,
    ) -> FlowStatus:
        if action in {"next-part", "back-part"} and from_phase is None:
            raise FlowError("内部错误：缺少 from_phase")

        if action == "next-part":
            assert from_phase is not None
            validator.validate_next_part(from_phase, to_phase)
        elif action == "back-part":
            assert from_phase is not None
            validator.validate_back_part(from_phase, to_phase)
        elif action == "start":
            validator.validate_start(to_phase)
        else:
            validator.validate_phase_exists(to_phase)

        config = self.cfg.load_config()
        run_pre_commit_hooks(
            root=self.root,
            git=self.git,
            status=status,
            from_phase=from_phase,
            to_phase=to_phase,
            action=action,
            config=config,
        )

        message = _build_commit_message(action=action, phase=to_phase, text=text)
        self.git.add_all()
        commit_hash = self.git.commit(message)

        next_step = status.current_step + 1
        entry = HistoryEntry(
            timestamp=now_iso(),
            action=action,
            phase=to_phase,
            step=next_step,
            summary=text,
            git_commit=commit_hash,
        )

        history = [*status.history, entry]
        return FlowStatus(
            task_id=status.task_id,
            current_phase=to_phase,
            current_step=next_step,
            started_at=status.started_at,
            history=history,
        )


def _get_phases(config: dict) -> list[str]:
    flow_cfg = config.get("flow", {})
    phases = flow_cfg.get("phases", DEFAULT_PHASES)
    if not isinstance(phases, list) or not phases:
        return DEFAULT_PHASES
    return phases


def _build_commit_message(*, action: str, phase: str, text: str) -> str:
    if action == "issue":
        return f"[aide] {phase} issue: {text}"
    if action == "error":
        return f"[aide] {phase} error: {text}"
    if action == "back-step":
        return f"[aide] {phase} back-step: {text}"
    if action == "back-part":
        return f"[aide] {phase} back-part: {text}"
    return f"[aide] {phase}: {text}"