use serde::{Deserialize, Serialize};
use uuid::Uuid;

use crate::error::AppError;
use crate::models::channels::ChannelMemberRole;
use crate::service::ImService;

use super::session::ImSession;

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct CreateChannelRoleParams {
    pub name: String,
    pub description: Option<String>,
    pub permissions: Vec<String>,
    pub assignable: bool,
}

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct UpdateChannelRoleParams {
    pub name: Option<String>,
    pub description: Option<String>,
    pub permissions: Option<Vec<String>>,
    pub assignable: Option<bool>,
}

impl ImService {
    pub async fn channel_role_list(
        &self,
        _ctx: &ImSession,
        channel_id: Uuid,
    ) -> Result<Vec<ChannelMemberRole>, AppError> {
        sqlx::query_as::<_, ChannelMemberRole>(
            "SELECT id, channel_id, name, description, permissions, assignable, \
             created_by, created_at, updated_at \
             FROM channel_member_role WHERE channel_id = $1 ORDER BY created_at",
        )
        .bind(channel_id)
        .fetch_all(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)
    }

    pub async fn channel_role_create(
        &self,
        ctx: &ImSession,
        channel_id: Uuid,
        params: CreateChannelRoleParams,
    ) -> Result<ChannelMemberRole, AppError> {
        let now = chrono::Utc::now();
        sqlx::query_as::<_, ChannelMemberRole>(
            "INSERT INTO channel_member_role \
             (id, channel_id, name, description, permissions, assignable, created_by, created_at, updated_at) \
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $8) \
             RETURNING id, channel_id, name, description, permissions, assignable, \
             created_by, created_at, updated_at",
        )
        .bind(Uuid::now_v7())
        .bind(channel_id)
        .bind(&params.name)
        .bind(params.description.as_deref())
        .bind(&params.permissions)
        .bind(params.assignable)
        .bind(ctx.user)
        .bind(now)
        .fetch_one(self.ctx.db.writer())
        .await
        .map_err(AppError::Database)
    }

    pub async fn channel_role_update(
        &self,
        _ctx: &ImSession,
        role_id: Uuid,
        params: UpdateChannelRoleParams,
    ) -> Result<ChannelMemberRole, AppError> {
        let now = chrono::Utc::now();
        sqlx::query_as::<_, ChannelMemberRole>(
            "UPDATE channel_member_role SET \
             name = COALESCE($1, name), \
             description = COALESCE($2, description), \
             permissions = COALESCE($3, permissions), \
             assignable = COALESCE($4, assignable), \
             updated_at = $5 \
             WHERE id = $6 \
             RETURNING id, channel_id, name, description, permissions, assignable, \
             created_by, created_at, updated_at",
        )
        .bind(params.name.as_deref())
        .bind(params.description.as_deref())
        .bind(params.permissions.as_ref())
        .bind(params.assignable)
        .bind(now)
        .bind(role_id)
        .fetch_one(self.ctx.db.writer())
        .await
        .map_err(AppError::Database)
    }

    pub async fn channel_role_delete(
        &self,
        _ctx: &ImSession,
        role_id: Uuid,
    ) -> Result<(), AppError> {
        sqlx::query("DELETE FROM channel_member_role WHERE id = $1")
            .bind(role_id)
            .execute(self.ctx.db.writer())
            .await
            .map_err(AppError::Database)?;
        Ok(())
    }
}