"""ClickUp REST API client."""

from __future__ import annotations

import logging
from dataclasses import dataclass, field
from typing import Any

import httpx

log = logging.getLogger(__name__)

BASE_URL = "https://api.clickup.com/api/v2"


@dataclass
class ClickUpTask:
    """Lightweight representation of a ClickUp task."""

    id: str
    name: str
    status: str
    description: str = ""
    task_type: str = ""
    url: str = ""
    custom_fields: dict[str, Any] = field(default_factory=dict)
    list_id: str = ""
    list_name: str = ""

    @classmethod
    def from_api(cls, data: dict, task_type_field_name: str = "Task Type") -> ClickUpTask:
        """Parse a task from the ClickUp API response."""
        custom_fields = {}
        task_type = ""
        for cf in data.get("custom_fields", []):
            cf_name = cf.get("name", "")
            cf_value = cf.get("value")

            # Resolve dropdown type_config to label
            if cf.get("type") == "drop_down" and cf_value is not None:
                options = cf.get("type_config", {}).get("options", [])
                order_index = cf_value if isinstance(cf_value, int) else None
                for opt in options:
                    if order_index is not None and opt.get("orderindex") == order_index:
                        cf_value = opt.get("name", cf_value)
                        break
                    elif opt.get("id") == cf_value:
                        cf_value = opt.get("name", cf_value)
                        break

            custom_fields[cf_name] = cf_value
            if cf_name == task_type_field_name:
                task_type = str(cf_value) if cf_value else ""

        status_name = data.get("status", {}).get("status", "unknown")

        return cls(
            id=data["id"],
            name=data.get("name", ""),
            status=status_name.lower(),
            description=data.get("description", "") or "",
            task_type=task_type,
            url=data.get("url", ""),
            custom_fields=custom_fields,
            list_id=data.get("list", {}).get("id", ""),
            list_name=data.get("list", {}).get("name", ""),
        )


class ClickUpClient:
    """Thin wrapper around the ClickUp REST API v2."""

    def __init__(self, api_token: str, workspace_id: str = "", task_type_field_name: str = "Task Type"):
        self._token = api_token
        self.workspace_id = workspace_id
        self._task_type_field_name = task_type_field_name
        self._client = httpx.Client(
            base_url=BASE_URL,
            headers={"Authorization": api_token, "Content-Type": "application/json"},
            timeout=30.0,
        )

    def close(self):
        self._client.close()

    # ── Read ──

    def get_tasks(self, list_id: str, statuses: list[str] | None = None) -> list[ClickUpTask]:
        """Fetch tasks from a specific list, optionally filtered by status."""
        params: dict[str, Any] = {"include_closed": "false", "subtasks": "true"}
        if statuses:
            for s in statuses:
                params.setdefault("statuses[]", [])
                if isinstance(params["statuses[]"], list):
                    params["statuses[]"].append(s)

        # httpx needs repeated params as a list of tuples
        param_list = []
        for k, v in params.items():
            if isinstance(v, list):
                for item in v:
                    param_list.append((k, item))
            else:
                param_list.append((k, v))

        resp = self._client.get(f"/list/{list_id}/task", params=param_list)
        resp.raise_for_status()
        tasks_data = resp.json().get("tasks", [])
        return [ClickUpTask.from_api(t, self._task_type_field_name) for t in tasks_data]

    def get_tasks_from_space(self, space_id: str, statuses: list[str] | None = None) -> list[ClickUpTask]:
        """Traverse all folders and lists in a space to collect tasks."""
        all_tasks: list[ClickUpTask] = []
        list_ids = set()

        # Get foldered lists
        try:
            resp = self._client.get(f"/space/{space_id}/folder")
            resp.raise_for_status()
            for folder in resp.json().get("folders", []):
                for lst in folder.get("lists", []):
                    list_ids.add(lst["id"])
        except httpx.HTTPStatusError as e:
            log.warning("Failed to fetch folders for space %s: %s", space_id, e)

        # Get folderless lists
        try:
            resp = self._client.get(f"/space/{space_id}/list")
            resp.raise_for_status()
            for lst in resp.json().get("lists", []):
                list_ids.add(lst["id"])
        except httpx.HTTPStatusError as e:
            log.warning("Failed to fetch folderless lists for space %s: %s", space_id, e)

        # Fetch tasks from each list
        for list_id in list_ids:
            try:
                tasks = self.get_tasks(list_id, statuses)
                all_tasks.extend(tasks)
            except httpx.HTTPStatusError as e:
                log.warning("Failed to fetch tasks from list %s: %s", list_id, e)

        log.info("Found %d tasks across %d lists in space %s", len(all_tasks), len(list_ids), space_id)
        return all_tasks

    # ── Write ──

    def update_task_status(self, task_id: str, status: str) -> bool:
        """Update a task's status."""
        try:
            resp = self._client.put(f"/task/{task_id}", json={"status": status})
            resp.raise_for_status()
            log.info("Updated task %s status to '%s'", task_id, status)
            return True
        except httpx.HTTPStatusError as e:
            log.error("Failed to update task %s status: %s", task_id, e)
            return False

    def add_comment(self, task_id: str, text: str) -> bool:
        """Add a comment to a task."""
        try:
            resp = self._client.post(
                f"/task/{task_id}/comment",
                json={"comment_text": text},
            )
            resp.raise_for_status()
            log.info("Added comment to task %s", task_id)
            return True
        except httpx.HTTPStatusError as e:
            log.error("Failed to add comment to task %s: %s", task_id, e)
            return False

    def get_custom_fields(self, list_id: str) -> list[dict]:
        """Get custom fields for a list."""
        try:
            resp = self._client.get(f"/list/{list_id}/field")
            resp.raise_for_status()
            return resp.json().get("fields", [])
        except httpx.HTTPStatusError as e:
            log.error("Failed to get custom fields for list %s: %s", list_id, e)
            return []