import io
from typing import Any
from fastapi import FastAPI, status, Header, UploadFile, Response
from starlette.responses import StreamingResponse
from fastapi.middleware.cors import CORSMiddleware
from based import db
import psycopg
from secrets import token_hex
from minio import Minio
from minio.helpers import ObjectWriteResult
from urllib3 import HTTPResponse
import uvicorn

from dba import *
from models import (
    AuthModel,
    ColumnsDefinitionList,
    ErrorResponseDefinition,
    ItemDeletionDefinitionList,
    ItemsFieldSelectorList,
    TableDefinition,
    TableListDefinition,
    UserDefinition,
)
from secutils import hash_password
from utils import (
    check_if_admin_access_token,
    parse_columns_from_definition,
)

conninfo = "postgresql://postgres:asarch6122@localhost"
connector = db.DBConnector(conninfo)

bootstrapDB(connector)

BUCKET_NAME = "tuuli-files"
minioClient = Minio(
    "localhost:8090",
    access_key="mxR0F5PK8CpCM8SA",
    secret_key="yFJsG70xLU3BiIMslinz6dhqKHqNpUc6",
    secure=False,
)
found = minioClient.bucket_exists(BUCKET_NAME)
if found:
    print(f"Bucket '{BUCKET_NAME}' already exists")
else:
    minioClient.make_bucket(BUCKET_NAME)

app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.post("/api/getAccessToken")
async def getAccessToken(userData: AuthModel):
    user = check_user(connector, userData.username, userData.password)
    if not user:
        return {"error": "Wrong username or password"}

    return {"access_token": user.access_token}


@app.get("/api/listTables")
async def listTables(
    response: Response,
    access_token: str | None = Header(default=None),
) -> TableListDefinition | ErrorResponseDefinition:
    is_admin = check_if_admin_access_token(connector, access_token)
    if not is_admin:
        return ErrorResponseDefinition(error="Not allowed")

    return TableListDefinition(
        tables=[TableDefinition.parse_obj(table) for table in connector.tables()]
    )


@app.post("/api/createTable/{tableName}")
async def createTable(
    tableName: str,
    columns: ColumnsDefinitionList,
    access_token: str | None = Header(default=None),
):
    is_admin = check_if_admin_access_token(connector, access_token)
    if not is_admin:
        return {"error": "Not allowed"}

    try:
        columnsDefinition = parse_columns_from_definition(",".join(columns.columns))
        create_table(connector, tableName, columnsDefinition)
    except psycopg.errors.UniqueViolation:
        return {"error": "Username already exists"}
    except Exception as e:
        return {"error": str(e)}

    return {"ok": True}


@app.post("/api/dropTable/{tableName}")
async def dropTable(
    tableName: str,
    access_token: str | None = Header(default=None),
):
    is_admin = check_if_admin_access_token(connector, access_token)
    if not is_admin:
        return {"error": "Not allowed"}

    try:
        drop_table(connector, tableName)
    except Exception as e:
        return {"error": str(e)}

    return {"ok": True}


@app.post("/api/createUser")
async def createUser(
    user: UserDefinition,
    access_token: str | None = Header(default=None),
):
    is_admin = check_if_admin_access_token(connector, access_token)
    if not is_admin:
        return {"error": "Not allowed"}

    try:
        create_user(connector, user.username, user.password)
    except psycopg.errors.UniqueViolation:
        return {"error": "Username already exists"}
    except Exception as e:
        return {"error": str(e)}

    return {"ok": True}


@app.post("/items/{tableName}")
async def items(
    tableName: str,
    selector: ItemsFieldSelectorList,
    access_token: str | None = Header(default=None),
):
    table_info = connector.getTable(tableName)
    if not table_info:
        return {"error": "Not allowed"}

    is_admin = check_if_admin_access_token(connector, access_token)
    if table_info["system"] and not is_admin:
        return {"error": "Not allowed"}

    columns = parse_columns_from_definition(table_info["columns"])
    columnsNames = set(column.name for column in columns)
    userSelectedColumns = list(set(selector.fields)) if selector.fields else ["*"]
    if userSelectedColumns != ["*"]:
        for column in userSelectedColumns:
            if column not in columnsNames:
                return {"error": f"Column {column} not found on table {tableName}"}
    else:
        userSelectedColumns = columnsNames

    user, group = get_user_by_access_token(connector, access_token)
    if not user:
        return {"error": "Not allowed"}

    if not is_admin:
        allowedColumns = get_allowed_columns_for_group(
            connector, tableName, group.id if group else -1
        )
        if not allowedColumns:
            return {"error": "Not allowed"}
        elif len(allowedColumns) == 1 and allowedColumns[0] == "*":
            pass
        else:
            for column in userSelectedColumns:
                if column not in allowedColumns:
                    return {"error": "Not allowed"}

    table_items = connector.selectFromTable(
        tableName, selector.fields if selector.fields else ["*"]
    )

    return {"items": table_items}


@app.post("/items/{tableName}/+")
async def itemsCreate(
    tableName: str,
    item: dict[str, str],
    access_token: str | None = Header(default=None),
):
    table_info = connector.getTable(tableName)
    if not table_info:
        return {"error": "Not found"}

    is_admin = check_if_admin_access_token(connector, access_token)
    if table_info["system"] and not is_admin:
        return {"error": "Not allowed"}

    user, group = get_user_by_access_token(connector, access_token)
    if not is_admin:
        allowedColumns = get_allowed_columns_for_group(
            connector, tableName, group.id if group else -1
        )
        if not allowedColumns:
            return {"error": "Not allowed"}
        elif len(allowedColumns) == 1 and allowedColumns[0] == "*":
            pass
        else:
            for column in item:
                if column not in allowedColumns:
                    return {"error": "Not allowed"}

    try:
        connector.insertIntoTable(tableName, item)
    except psycopg.errors.UndefinedColumn:
        return {"error": "Column not found"}
    except psycopg.errors.UniqueViolation:
        return {"error": "Unique constraint violation"}
    except Exception as e:
        return {"error": str(e)}

    return {"ok": True}


@app.post("/items/{tableName}/*")
async def itemsUpdate(
    tableName: str,
    item: dict[str, str],
    oldItem: dict[str, str],
    access_token: str | None = Header(default=None),
):
    table_info = connector.getTable(tableName)
    if not table_info:
        return {"error": "Not found"}

    is_admin = check_if_admin_access_token(connector, access_token)
    if table_info["system"] and not is_admin:
        return {"error": "Not allowed"}

    user, group = get_user_by_access_token(connector, access_token)
    if not is_admin:
        allowedColumns = get_allowed_columns_for_group(
            connector, tableName, group.id if group else -1
        )
        if not allowedColumns:
            return {"error": "Not allowed"}
        elif len(allowedColumns) == 1 and allowedColumns[0] == "*":
            pass
        else:
            for column in item:
                if column not in allowedColumns:
                    return {"error": "Not allowed"}

    try:
        connector.updateDataInTable(
            tableName,
            [ColumnUpdate(column=c, value=item[c]) for c in item],
            [ColumnCondition(column=c, value=oldItem[c]) for c in oldItem],
        )
    except psycopg.errors.UndefinedColumn:
        return {"error": "Column not found"}
    except Exception as e:
        return {"error": str(e)}

    return {"ok": True}


@app.post("/items/{tableName}/-")
async def itemsDelete(
    tableName: str,
    deleteWhere: ItemDeletionDefinitionList,
    access_token: str | None = Header(default=None),
):
    table_info = connector.getTable(tableName)
    if not table_info:
        return {"error": "Not found"}

    is_admin = check_if_admin_access_token(connector, access_token)
    if table_info["system"] and not is_admin:
        return {"error": "Not allowed"}

    user, group = get_user_by_access_token(connector, access_token)
    if not is_admin:
        allowedColumns = get_allowed_columns_for_group(
            connector, tableName, group.id if group else -1
        )
        if not allowedColumns:
            return {"error": "Not allowed"}
        elif len(allowedColumns) == 1 and allowedColumns[0] == "*":
            pass
        else:
            return {"error": "Not allowed"}

    try:
        connector.deleteFromTable(
            tableName,
            [
                ColumnCondition(where.name, where.value, where.isString, where.isLike)
                for where in deleteWhere.defs
            ],
        )
    except Exception as e:
        return {"error": str(e)}

    return {"ok": True}


@app.get("/assets/{fid}")
async def getAsset(fid: str, access_token: str | None = Header(default=None)):
    asset = get_asset(connector, access_token, fid)
    if not asset:
        return status.HTTP_404_NOT_FOUND

    response: HTTPResponse | None = None
    try:
        response = minioClient.get_object(BUCKET_NAME, asset.name, version_id=asset.fid)
        if response is None:
            return status.HTTP_404_NOT_FOUND

        return StreamingResponse(
            content=io.BytesIO(response.data),
            media_type=response.getheader("Content-Type"),
            status_code=status.HTTP_200_OK,
        )
    finally:
        if response is not None:
            response.close()
            response.release_conn()


@app.post("/assets/+")
async def createAsset(
    asset: UploadFile,
    access_token: str | None = Header(default=None),
):
    user, _ = get_user_by_access_token(connector, access_token)
    if not user:
        return {"error": "Not allowed"}

    filename = asset.filename
    if not filename:
        filename = f"unnamed"
    filename = f"{token_hex()}_{filename}"

    result: ObjectWriteResult = minioClient.put_object(
        BUCKET_NAME,
        filename,
        data=asset.file,
        content_type=(
            asset.content_type if asset.content_type else "application/octet-stream"
        ),
        length=asset.size,
    )

    if not create_asset(connector, filename, "", str(result.version_id)):
        return {"error": "Failed to create asset"}
    return {"ok": True, "fid": result.version_id}


if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)