"""Redis client for DevOpsDash — reads the same keys as DevOpsMCP."""

from __future__ import annotations

import json
import os
from typing import Any, Dict, List, Optional

import redis

# ── Key prefixes (must match DevOpsMCP exactly) ───────────────────────────────
BOARD_KEY_PREFIX = "devops-mcp:taskboard:"
TASK_KEY_PREFIX = "devops-mcp:task:"
BOARD_INDEX_KEY = "devops-mcp:taskboard:_index"

ADR_KEY_PREFIX = "devops-mcp:adr:"
ADR_INDEX_KEY = "devops-mcp:adr:_index"

MEMORY_KEY_PREFIX = "devops-mcp:memory:"

PROJECT_KEY_PREFIX = "devops-mcp:projects:"
PROJECT_INDEX_KEY = "devops-mcp:projects:_index"

WORKCONTEXT_KEY_PREFIX = "devops-mcp:workcontext:"


def get_redis() -> redis.Redis:
    url = os.environ.get("REDIS_URL", "redis://localhost:6379")
    return redis.from_url(url, decode_responses=True, socket_connect_timeout=3)


# ── Task boards ───────────────────────────────────────────────────────────────

def list_boards(r: redis.Redis, project: Optional[str] = None, status: Optional[str] = None) -> List[Dict[str, Any]]:
    index: List[str] = json.loads(r.get(BOARD_INDEX_KEY) or "[]")
    boards = []
    for bid in index:
        raw = r.get(f"{BOARD_KEY_PREFIX}{bid}")
        if raw:
            board = json.loads(raw)
            if project and project.lower() not in board.get("project", "").lower():
                continue
            if status and board.get("status") != status:
                continue
            boards.append(board)
    boards.sort(key=lambda b: b.get("updated_at", ""), reverse=True)
    return boards


def get_board(r: redis.Redis, board_id: str) -> Optional[Dict[str, Any]]:
    raw = r.get(f"{BOARD_KEY_PREFIX}{board_id}")
    return json.loads(raw) if raw else None


def save_board(r: redis.Redis, board: Dict[str, Any]) -> None:
    bid = board["board_id"]
    r.set(f"{BOARD_KEY_PREFIX}{bid}", json.dumps(board), ex=86400 * 365 * 3)
    index: List[str] = json.loads(r.get(BOARD_INDEX_KEY) or "[]")
    if bid not in index:
        index.append(bid)
    r.set(BOARD_INDEX_KEY, json.dumps(index), ex=86400 * 365 * 3)


def save_task(r: redis.Redis, task: Dict[str, Any]) -> None:
    tid = task["task_id"]
    r.set(f"{TASK_KEY_PREFIX}{tid}", json.dumps(task), ex=86400 * 365 * 3)
    board = get_board(r, task["board_id"])
    if board:
        tasks = board.setdefault("tasks", [])
        existing = next((i for i, t in enumerate(tasks) if t["task_id"] == tid), None)
        if existing is not None:
            tasks[existing] = task
        else:
            tasks.append(task)
        from datetime import datetime, timezone
        board["updated_at"] = datetime.now(timezone.utc).isoformat()
        save_board(r, board)


# ── ADRs ──────────────────────────────────────────────────────────────────────

def list_adrs(r: redis.Redis, status_filter: Optional[str] = None) -> List[Dict[str, Any]]:
    index: List[str] = json.loads(r.get(ADR_INDEX_KEY) or "[]")
    adrs = []
    for adr_id in index:
        raw = r.get(f"{ADR_KEY_PREFIX}{adr_id}")
        if raw:
            adr = json.loads(raw)
            if status_filter and adr.get("status", "").lower() != status_filter.lower():
                continue
            adrs.append(adr)
    adrs.sort(key=lambda a: a.get("number", 0))
    return adrs


def get_adr(r: redis.Redis, adr_id: str) -> Optional[Dict[str, Any]]:
    raw = r.get(f"{ADR_KEY_PREFIX}{adr_id}")
    return json.loads(raw) if raw else None


# ── Memories ──────────────────────────────────────────────────────────────────

def list_memories(r: redis.Redis, entity_type: Optional[str] = None, limit: int = 50) -> List[Dict[str, Any]]:
    keys = r.keys(f"{MEMORY_KEY_PREFIX}*")
    memories = []
    for key in keys:
        if key.endswith("_index"):
            continue
        raw = r.get(key)
        if raw:
            try:
                mem = json.loads(raw)
                if entity_type and mem.get("entity_type", "").lower() != entity_type.lower():
                    continue
                memories.append(mem)
            except json.JSONDecodeError:
                pass
    memories.sort(key=lambda m: m.get("created_at", ""), reverse=True)
    return memories[:limit]


# ── Projects ──────────────────────────────────────────────────────────────────

def list_projects(r: redis.Redis, context: Optional[str] = None) -> List[Dict[str, Any]]:
    index: List[str] = json.loads(r.get(PROJECT_INDEX_KEY) or "[]")
    projects = []
    for path in index:
        raw = r.get(f"{PROJECT_KEY_PREFIX}{path}")
        if raw:
            proj = json.loads(raw)
            if context and proj.get("context", "").lower() != context.lower():
                continue
            projects.append(proj)
    return projects


def list_workcontexts(r: redis.Redis) -> List[Dict[str, Any]]:
    keys = r.keys(f"{WORKCONTEXT_KEY_PREFIX}*")
    contexts = []
    for key in keys:
        raw = r.get(key)
        if raw:
            try:
                ctx = json.loads(raw)
                ctx["path"] = key[len(WORKCONTEXT_KEY_PREFIX):]
                contexts.append(ctx)
            except json.JSONDecodeError:
                pass
    contexts.sort(key=lambda c: c.get("saved_at", ""), reverse=True)
    return contexts