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//
// Copyright (C) 2019 Kubos Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License")
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

//! Service mutations

use crate::models::subsystem::Mutations;
use crate::models::{MutationResponse, TestType};
use crate::schema::Context;
use juniper::FieldResult;

/// Top-level mutation root structure
pub struct Root;

/// Base GraphQL mutation model
graphql_object!(Root: Context as "Mutation" |&self| {

    // Execute a trivial command against the system
    // 
    //  mutation {
    //      noop {
    //          success: Boolean!
    //          errors: String!
    //      }
    //  }
    field noop(&executor) -> FieldResult<MutationResponse>
        as "Run no-op command"
    {
        executor.context().subsystem().set_last_mutation(Mutations::Noop);
        Ok(executor.context().subsystem().reset_watchdog()?)
    }

    //  Manually reset the EPS
    // 
    //  mutation {
    //      manualReset {
    //          success: Boolean!
    //          errors: String!
    //      }
    //  }
    field manual_reset(&executor) -> FieldResult<MutationResponse>
        as "Perform manual reset of EPS board"
    {
        executor.context().subsystem().set_last_mutation(Mutations::ManualReset);
        Ok(executor.context().subsystem().manual_reset()?)
    }

    //  Reset the communications watchdog timer
    // 
    //  mutation {
    //      resetWatchdog {
    //          success: Boolean!
    //          errors: String!
    //      }
    //  }
    field reset_watchdog(&executor) -> FieldResult<MutationResponse>
        as "Reset/kick communications watchdog"
    {
        executor.context().subsystem().set_last_mutation(Mutations::ResetWatchdog);
        Ok(executor.context().subsystem().reset_watchdog()?)
    }

    //  Set the communications watchdog timeout period
    // 
    //  - period: New timeout period, in minutes
    // 
    //  mutation {
    //      setWatchdogPeriod(period: Int!) {
    //          success: Boolean!
    //          errors: String!
    //      }
    //  }
    field set_watchdog_period(&executor, period: i32) -> FieldResult<MutationResponse>
        as "Set watchdog period (in minutes)"
    {
        executor.context().subsystem().set_last_mutation(Mutations::SetWatchdogPeriod);
        Ok(executor.context().subsystem().set_watchdog_period(period as u8)?)
    }

    //  Pass a custom command through to the system
    // 
    //  - command: Decimal value of the command byte to send
    //  - data: Decimal values of the command parameters to send. Should be `[0]` if there are no additional parameters required.
    // 
    //  mutation {
    //      issueRawCommand(command: Int!, data: [Int!]) {
    //          success: Boolean!
    //          errors: String!
    //      }
    //  }
    field issue_raw_command(&executor, command: i32, data: Vec<i32>) -> FieldResult<MutationResponse>
        as "Issue raw command to EPS"
    {
        executor.context().subsystem().set_last_mutation(Mutations::RawCommand);
        let data_u8 = data.iter().map(|x| *x as u8).collect();
        Ok(executor.context().subsystem().raw_command(command as u8, data_u8)?)
    }

    // Perform a system test
    //
    // - test: Specific test to perform. Should be `HARDWARE`
    // 
    //  mutation {
    //      testHardware(test: TestType) {
    //          success: Boolean!
    //          errors: String!
    //      }
    //  }
    field testHardware(&executor, test: TestType) -> FieldResult<MutationResponse>
        as "Test hardware"
    {
        executor.context().subsystem().set_last_mutation(Mutations::TestHardware);

        match test {
            TestType::Hardware => Ok(executor.context().subsystem().test_hardware()?),
            TestType::Integration => Ok(MutationResponse {
                    errors: "Not Implemented".to_owned(),
                    success: false
            })
        }
    }
});