import json
from pathlib import Path

import aiosqlite
from pydantic import BaseModel

from duck_core.tasks.store import utc_now


class ExperienceRecord(BaseModel):
    id: int | None = None
    task_id: str
    skill_id: str | None = None
    summary: str
    result: str
    what_worked: list[str] = []
    what_failed: list[str] = []
    reusable_lesson: str | None = None
    suggested_skill_patch: str | None = None
    confidence: float | None = None
    created_at: str


class ExperienceRecorder:
    def __init__(self, db_path: str):
        self.db_path = Path(db_path)

    async def init(self) -> None:
        self.db_path.parent.mkdir(parents=True, exist_ok=True)
        async with aiosqlite.connect(self.db_path) as db:
            await db.execute(
                """
                create table if not exists experience_records (
                  id integer primary key autoincrement,
                  task_id text not null,
                  skill_id text,
                  summary text not null,
                  result text not null,
                  what_worked_json text,
                  what_failed_json text,
                  reusable_lesson text,
                  suggested_skill_patch text,
                  confidence real,
                  created_at text not null
                )
                """
            )
            await db.commit()

    async def record(
        self,
        task_id: str,
        summary: str,
        result: str,
        skill_id: str | None = None,
        what_worked: list[str] | None = None,
        what_failed: list[str] | None = None,
        reusable_lesson: str | None = None,
        suggested_skill_patch: str | None = None,
        confidence: float | None = None,
    ) -> ExperienceRecord:
        await self.init()
        now = utc_now()
        async with aiosqlite.connect(self.db_path) as db:
            cursor = await db.execute(
                """
                insert into experience_records(
                  task_id, skill_id, summary, result, what_worked_json,
                  what_failed_json, reusable_lesson, suggested_skill_patch,
                  confidence, created_at
                ) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
                """,
                (
                    task_id,
                    skill_id,
                    summary,
                    result,
                    json.dumps(what_worked or []),
                    json.dumps(what_failed or []),
                    reusable_lesson,
                    suggested_skill_patch,
                    confidence,
                    now,
                ),
            )
            await db.commit()
            row_id = cursor.lastrowid
        if suggested_skill_patch and skill_id:
            self.write_skill_update_proposal(task_id, skill_id, suggested_skill_patch)
        return ExperienceRecord(
            id=row_id,
            task_id=task_id,
            skill_id=skill_id,
            summary=summary,
            result=result,
            what_worked=what_worked or [],
            what_failed=what_failed or [],
            reusable_lesson=reusable_lesson,
            suggested_skill_patch=suggested_skill_patch,
            confidence=confidence,
            created_at=now,
        )

    async def list_records(self) -> list[ExperienceRecord]:
        await self.init()
        async with aiosqlite.connect(self.db_path) as db:
            db.row_factory = aiosqlite.Row
            cursor = await db.execute(
                "select * from experience_records order by created_at desc"
            )
            rows = await cursor.fetchall()
        return [self._row_to_record(row) for row in rows]

    async def get_record(self, record_id: int) -> ExperienceRecord | None:
        await self.init()
        async with aiosqlite.connect(self.db_path) as db:
            db.row_factory = aiosqlite.Row
            cursor = await db.execute(
                "select * from experience_records where id = ?", (record_id,)
            )
            row = await cursor.fetchone()
        return self._row_to_record(row) if row else None

    def write_skill_update_proposal(self, task_id: str, skill_id: str, patch: str) -> Path:
        directory = Path("skills/_proposals")
        directory.mkdir(parents=True, exist_ok=True)
        path = directory / f"{utc_now().replace(':', '').replace('+', '_')}_{skill_id}.patch.md"
        path.write_text(
            "\n".join(
                [
                    "# Skill update proposal",
                    "",
                    f"Skill: {skill_id}",
                    "",
                    "## Reason",
                    "",
                    "Reflection suggested a reusable skill improvement.",
                    "",
                    "## Proposed changes",
                    "",
                    patch,
                    "",
                    "## Evidence",
                    "",
                    f"Task id: {task_id}",
                    "",
                    "## Risk",
                    "",
                    "Low.",
                    "",
                    "## Requires human approval",
                    "",
                    "Yes.",
                ]
            )
        )
        return path

    def _row_to_record(self, row: aiosqlite.Row) -> ExperienceRecord:
        return ExperienceRecord(
            id=row["id"],
            task_id=row["task_id"],
            skill_id=row["skill_id"],
            summary=row["summary"],
            result=row["result"],
            what_worked=json.loads(row["what_worked_json"] or "[]"),
            what_failed=json.loads(row["what_failed_json"] or "[]"),
            reusable_lesson=row["reusable_lesson"],
            suggested_skill_patch=row["suggested_skill_patch"],
            confidence=row["confidence"],
            created_at=row["created_at"],
        )