package service

import (
	"context"
	"encoding/json"
	"net/http"
	"strings"
	"testing"
	"time"

	"gcy_hpc_server/internal/model"
	"gcy_hpc_server/internal/slurm"
)

func TestProcessTask_DefaultTimeLimit(t *testing.T) {
	jobID := int32(42)

	var capturedReq slurm.JobSubmitReq

	env := newTaskTestEnv(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := json.NewDecoder(r.Body).Decode(&capturedReq); err != nil {
			t.Fatalf("decode request body: %v", err)
		}
		json.NewEncoder(w).Encode(slurm.OpenapiJobSubmitResponse{
			Result: &slurm.JobSubmitResponseMsg{JobID: &jobID},
		})
	}))
	defer env.close()

	appID := env.createApp(t, "default-tl-app", "#!/bin/bash\necho hello", json.RawMessage(`[]`))

	ctx := context.Background()

	task := &model.Task{
		AppName:     "default-tl-app",
		AppID:       appID,
		Status:      model.TaskStatusSubmitted,
		SubmittedAt: time.Now(),
		Partition:   "debug",
	}
	taskID, err := env.taskStore.Create(ctx, task)
	if err != nil {
		t.Fatalf("create task in DB: %v", err)
	}

	err = env.svc.ProcessTask(ctx, taskID)
	if err != nil {
		t.Fatalf("ProcessTask: %v", err)
	}

	j := capturedReq.Job
	if j == nil {
		t.Fatal("Job desc is nil in captured request")
	}

	if j.TimeLimit == nil {
		t.Fatal("TimeLimit should not be nil, got nil")
	}
	if j.TimeLimit.Number == nil {
		t.Fatal("TimeLimit.Number should not be nil, got nil")
	}
	if *j.TimeLimit.Number != int64(10080) {
		t.Errorf("TimeLimit.Number = %d, want %d", *j.TimeLimit.Number, int64(10080))
	}
}

func TestProcessTask_DefaultStdoutStderr(t *testing.T) {
	jobID := int32(42)

	var capturedReq slurm.JobSubmitReq

	env := newTaskTestEnv(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := json.NewDecoder(r.Body).Decode(&capturedReq); err != nil {
			t.Fatalf("decode request body: %v", err)
		}
		json.NewEncoder(w).Encode(slurm.OpenapiJobSubmitResponse{
			Result: &slurm.JobSubmitResponseMsg{JobID: &jobID},
		})
	}))
	defer env.close()

	appID := env.createApp(t, "default-std-app", "#!/bin/bash\necho hello", json.RawMessage(`[]`))

	ctx := context.Background()

	task := &model.Task{
		AppName:     "default-std-app",
		AppID:       appID,
		Status:      model.TaskStatusSubmitted,
		SubmittedAt: time.Now(),
		Partition:   "debug",
	}
	taskID, err := env.taskStore.Create(ctx, task)
	if err != nil {
		t.Fatalf("create task in DB: %v", err)
	}

	err = env.svc.ProcessTask(ctx, taskID)
	if err != nil {
		t.Fatalf("ProcessTask: %v", err)
	}

	j := capturedReq.Job
	if j == nil {
		t.Fatal("Job desc is nil in captured request")
	}

	if j.StandardOutput == nil {
		t.Fatal("StandardOutput should not be nil, got nil")
	}
	if !strings.HasSuffix(*j.StandardOutput, "/slurm-%j.out") {
		t.Errorf("StandardOutput = %q, want suffix /slurm-%%j.out", *j.StandardOutput)
	}

	if j.StandardError == nil {
		t.Fatal("StandardError should not be nil, got nil")
	}
	if !strings.HasSuffix(*j.StandardError, "/slurm-%j.err") {
		t.Errorf("StandardError = %q, want suffix /slurm-%%j.err", *j.StandardError)
	}
}

func TestProcessTask_NoOverrideWhenSet(t *testing.T) {
	jobID := int32(42)

	var capturedReq slurm.JobSubmitReq

	env := newTaskTestEnv(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := json.NewDecoder(r.Body).Decode(&capturedReq); err != nil {
			t.Fatalf("decode request body: %v", err)
		}
		json.NewEncoder(w).Encode(slurm.OpenapiJobSubmitResponse{
			Result: &slurm.JobSubmitResponseMsg{JobID: &jobID},
		})
	}))
	defer env.close()

	appID := env.createApp(t, "no-override-app", "#!/bin/bash\necho hello", json.RawMessage(`[]`))

	ctx := context.Background()

	customTL := int32(60)
	customOut := "/custom/path.out"
	task := &model.Task{
		AppName:        "no-override-app",
		AppID:          appID,
		Status:         model.TaskStatusSubmitted,
		SubmittedAt:    time.Now(),
		Partition:      "debug",
		TimeLimit:      &customTL,
		StandardOutput: &customOut,
	}
	taskID, err := env.taskStore.Create(ctx, task)
	if err != nil {
		t.Fatalf("create task in DB: %v", err)
	}

	err = env.svc.ProcessTask(ctx, taskID)
	if err != nil {
		t.Fatalf("ProcessTask: %v", err)
	}

	j := capturedReq.Job
	if j == nil {
		t.Fatal("Job desc is nil in captured request")
	}

	if j.TimeLimit == nil {
		t.Fatal("TimeLimit should not be nil, got nil")
	}
	if j.TimeLimit.Number == nil {
		t.Fatal("TimeLimit.Number should not be nil, got nil")
	}
	if *j.TimeLimit.Number != int64(60) {
		t.Errorf("TimeLimit.Number = %d, want %d (user value should be preserved)", *j.TimeLimit.Number, int64(60))
	}

	if j.StandardOutput == nil {
		t.Fatal("StandardOutput should not be nil, got nil")
	}
	if *j.StandardOutput != "/custom/path.out" {
		t.Errorf("StandardOutput = %q, want %q (user value should be preserved)", *j.StandardOutput, "/custom/path.out")
	}
}