package model

import (
	"encoding/json"
	"testing"
	"time"
)

func TestTask_TableName(t *testing.T) {
	task := Task{}
	if got := task.TableName(); got != "hpc_tasks" {
		t.Errorf("Task.TableName() = %q, want %q", got, "hpc_tasks")
	}
}

func TestTask_JSONRoundTrip(t *testing.T) {
	now := time.Now().UTC().Truncate(time.Second)
	jobID := int32(42)

	cpus := int32(16)
	memPerNode := int64(32768)
	timeLimit := int32(60)
	task := Task{
		ID:            1,
		TaskName:      "test task",
		AppID:         10,
		AppName:       "GROMACS",
		Status:        TaskStatusRunning,
		CurrentStep:   TaskStepSubmitting,
		RetryCount:    1,
		Values:        json.RawMessage(`{"np":"4"}`),
		InputFileIDs:  json.RawMessage(`[1,2,3]`),
		Script:        "#!/bin/bash",
		SlurmJobID:    &jobID,
		WorkDir:       "/data/work",
		Partition:     "gpu",
		ErrorMessage:  "",
		UserID:        "user1",
		SubmittedAt:   now,
		StartedAt:     &now,
		FinishedAt:    nil,
		CreatedAt:     now,
		UpdatedAt:     now,
		Cpus:          &cpus,
		MemoryPerNode: &memPerNode,
		TimeLimit:     &timeLimit,
	}

	data, err := json.Marshal(task)
	if err != nil {
		t.Fatalf("marshal task: %v", err)
	}

	var got Task
	if err := json.Unmarshal(data, &got); err != nil {
		t.Fatalf("unmarshal task: %v", err)
	}

	if got.ID != task.ID {
		t.Errorf("ID = %d, want %d", got.ID, task.ID)
	}
	if got.TaskName != task.TaskName {
		t.Errorf("TaskName = %q, want %q", got.TaskName, task.TaskName)
	}
	if got.Status != task.Status {
		t.Errorf("Status = %q, want %q", got.Status, task.Status)
	}
	if got.CurrentStep != task.CurrentStep {
		t.Errorf("CurrentStep = %q, want %q", got.CurrentStep, task.CurrentStep)
	}
	if got.RetryCount != task.RetryCount {
		t.Errorf("RetryCount = %d, want %d", got.RetryCount, task.RetryCount)
	}
	if got.SlurmJobID == nil || *got.SlurmJobID != jobID {
		t.Errorf("SlurmJobID = %v, want %d", got.SlurmJobID, jobID)
	}
	if got.UserID != task.UserID {
		t.Errorf("UserID = %q, want %q", got.UserID, task.UserID)
	}
	if string(got.Values) != string(task.Values) {
		t.Errorf("Values = %s, want %s", got.Values, task.Values)
	}
	if string(got.InputFileIDs) != string(task.InputFileIDs) {
		t.Errorf("InputFileIDs = %s, want %s", got.InputFileIDs, task.InputFileIDs)
	}
	if got.FinishedAt != nil {
		t.Errorf("FinishedAt = %v, want nil", got.FinishedAt)
	}
	if got.Partition != task.Partition {
		t.Errorf("Partition = %q, want %q", got.Partition, task.Partition)
	}
	if got.Cpus == nil || *got.Cpus != cpus {
		t.Errorf("Cpus = %v, want %d", got.Cpus, cpus)
	}
	if got.MemoryPerNode == nil || *got.MemoryPerNode != memPerNode {
		t.Errorf("MemoryPerNode = %v, want %d", got.MemoryPerNode, memPerNode)
	}
	if got.TimeLimit == nil || *got.TimeLimit != timeLimit {
		t.Errorf("TimeLimit = %v, want %d", got.TimeLimit, timeLimit)
	}
}

func TestCreateTaskRequest_JSONBinding(t *testing.T) {
	payload := `{"app_id":5,"task_name":"my task","values":{"np":"8"},"file_ids":[10,20]}`
	var req CreateTaskRequest
	if err := json.Unmarshal([]byte(payload), &req); err != nil {
		t.Fatalf("unmarshal CreateTaskRequest: %v", err)
	}

	if req.AppID != 5 {
		t.Errorf("AppID = %d, want 5", req.AppID)
	}
	if req.TaskName != "my task" {
		t.Errorf("TaskName = %q, want %q", req.TaskName, "my task")
	}
	if v, ok := req.Values["np"]; !ok || v != "8" {
		t.Errorf("Values[\"np\"] = %q, want %q", v, "8")
	}
	if len(req.InputFileIDs) != 2 || req.InputFileIDs[0] != 10 || req.InputFileIDs[1] != 20 {
		t.Errorf("InputFileIDs = %v, want [10 20]", req.InputFileIDs)
	}
}

func TestTaskResponse_JSONSerialization(t *testing.T) {
	cpus := int32(8)
	memPerNode := int64(16384)
	memPerCpu := int64(4096)
	timeLimit := int32(120)
	qos := "high"
	jobName := "gmx-md"
	nodes := "2"
	tasks := int32(4)
	cpusPerTask := int32(2)
	constraints := "haswell"
	reservation := "my-resv"
	account := "proj-123"
	nice := int32(100)
	mailType := "END"
	mailUser := "user@example.com"
	stdout := "/tmp/%j.out"
	stderr := "/tmp/%j.err"
	stdin := "/dev/null"
	reqNodes := "node[01-03]"
	exclNodes := "node04"
	beginTime := int64(1700000000)
	deadline := int64(1700086400)
	array := "1-10"
	dependency := "afterok:12345"
	requeue := true
	killOnNodeFail := true

	resp := TaskResponse{
		ID:             1,
		TaskName:       "test",
		AppID:          10,
		AppName:        "GROMACS",
		Status:         "running",
		CurrentStep:    "submitting",
		RetryCount:     0,
		SlurmJobID:     nil,
		WorkDir:        "/data",
		ErrorMessage:   "",
		CreatedAt:      time.Now().UTC().Truncate(time.Second),
		UpdatedAt:      time.Now().UTC().Truncate(time.Second),
		Partition:      "gpu",
		Cpus:           &cpus,
		MemoryPerNode:  &memPerNode,
		MemoryPerCpu:   &memPerCpu,
		TimeLimit:      &timeLimit,
		QOS:            &qos,
		JobName:        &jobName,
		Nodes:          &nodes,
		Tasks:          &tasks,
		CpusPerTask:    &cpusPerTask,
		Constraints:    &constraints,
		Reservation:    &reservation,
		Account:        &account,
		Nice:           &nice,
		MailType:       &mailType,
		MailUser:       &mailUser,
		StandardOutput: &stdout,
		StandardError:  &stderr,
		StandardInput:  &stdin,
		RequiredNodes:  &reqNodes,
		ExcludedNodes:  &exclNodes,
		BeginTime:      &beginTime,
		Deadline:       &deadline,
		Array:          &array,
		Dependency:     &dependency,
		Requeue:        &requeue,
		KillOnNodeFail: &killOnNodeFail,
	}

	data, err := json.Marshal(resp)
	if err != nil {
		t.Fatalf("marshal TaskResponse: %v", err)
	}

	var m map[string]interface{}
	if err := json.Unmarshal(data, &m); err != nil {
		t.Fatalf("unmarshal to map: %v", err)
	}

	assertString(t, m, "partition", "gpu")
	assertFloat64(t, m, "cpus", float64(cpus))
	assertFloat64(t, m, "memory_per_node", float64(memPerNode))
	assertFloat64(t, m, "memory_per_cpu", float64(memPerCpu))
	assertFloat64(t, m, "time_limit", float64(timeLimit))
	assertString(t, m, "qos", qos)
	assertString(t, m, "job_name", jobName)
	assertString(t, m, "nodes", nodes)
	assertFloat64(t, m, "tasks", float64(tasks))
	assertFloat64(t, m, "cpus_per_task", float64(cpusPerTask))
	assertString(t, m, "constraints", constraints)
	assertString(t, m, "reservation", reservation)
	assertString(t, m, "account", account)
	assertFloat64(t, m, "nice", float64(nice))
	assertString(t, m, "mail_type", mailType)
	assertString(t, m, "mail_user", mailUser)
	assertString(t, m, "standard_output", stdout)
	assertString(t, m, "standard_error", stderr)
	assertString(t, m, "standard_input", stdin)
	assertString(t, m, "required_nodes", reqNodes)
	assertString(t, m, "excluded_nodes", exclNodes)
	assertFloat64(t, m, "begin_time", float64(beginTime))
	assertFloat64(t, m, "deadline", float64(deadline))
	assertString(t, m, "array", array)
	assertString(t, m, "dependency", dependency)
	assertBool(t, m, "requeue", requeue)
	assertBool(t, m, "kill_on_node_fail", killOnNodeFail)
}

func TestCreateTaskRequest_SchedulingFields(t *testing.T) {
	payload := `{
		"app_id": 5,
		"partition": "gpu",
		"cpus": 16,
		"memory_per_node": 32768,
		"memory_per_cpu": 4096,
		"time_limit": 120,
		"qos": "high",
		"job_name": "gmx-sim",
		"nodes": "2",
		"tasks": 4,
		"cpus_per_task": 2,
		"constraints": "haswell",
		"reservation": "my-resv",
		"account": "proj-123",
		"nice": 50,
		"mail_type": "ALL",
		"mail_user": "user@example.com",
		"standard_output": "/tmp/%j.out",
		"standard_error": "/tmp/%j.err",
		"standard_input": "/dev/null",
		"required_nodes": "node[01-03]",
		"excluded_nodes": "node04",
		"begin_time": 1700000000,
		"deadline": 1700086400,
		"array": "1-10",
		"dependency": "afterok:12345",
		"requeue": true,
		"kill_on_node_fail": false
	}`

	var req CreateTaskRequest
	if err := json.Unmarshal([]byte(payload), &req); err != nil {
		t.Fatalf("unmarshal CreateTaskRequest: %v", err)
	}

	if req.AppID != 5 {
		t.Errorf("AppID = %d, want 5", req.AppID)
	}
	assertPtrString(t, req.Partition, "gpu")
	assertPtrInt32(t, req.Cpus, 16)
	assertPtrInt64(t, req.MemoryPerNode, 32768)
	assertPtrInt64(t, req.MemoryPerCpu, 4096)
	assertPtrInt32(t, req.TimeLimit, 120)
	assertPtrString(t, req.QOS, "high")
	assertPtrString(t, req.JobName, "gmx-sim")
	assertPtrString(t, req.Nodes, "2")
	assertPtrInt32(t, req.Tasks, 4)
	assertPtrInt32(t, req.CpusPerTask, 2)
	assertPtrString(t, req.Constraints, "haswell")
	assertPtrString(t, req.Reservation, "my-resv")
	assertPtrString(t, req.Account, "proj-123")
	assertPtrInt32(t, req.Nice, 50)
	assertPtrString(t, req.MailType, "ALL")
	assertPtrString(t, req.MailUser, "user@example.com")
	assertPtrString(t, req.StandardOutput, "/tmp/%j.out")
	assertPtrString(t, req.StandardError, "/tmp/%j.err")
	assertPtrString(t, req.StandardInput, "/dev/null")
	assertPtrString(t, req.RequiredNodes, "node[01-03]")
	assertPtrString(t, req.ExcludedNodes, "node04")
	assertPtrInt64(t, req.BeginTime, 1700000000)
	assertPtrInt64(t, req.Deadline, 1700086400)
	assertPtrString(t, req.Array, "1-10")
	assertPtrString(t, req.Dependency, "afterok:12345")
	assertPtrBool(t, req.Requeue, true)
	assertPtrBool(t, req.KillOnNodeFail, false)
}

func TestCreateTaskRequest_BackwardCompat(t *testing.T) {
	payload := `{"app_id": 1}`
	var req CreateTaskRequest
	if err := json.Unmarshal([]byte(payload), &req); err != nil {
		t.Fatalf("unmarshal minimal CreateTaskRequest: %v", err)
	}

	if req.AppID != 1 {
		t.Errorf("AppID = %d, want 1", req.AppID)
	}
	if req.Partition != nil {
		t.Errorf("Partition = %v, want nil", req.Partition)
	}
	if req.Cpus != nil {
		t.Errorf("Cpus = %v, want nil", req.Cpus)
	}
	if req.MemoryPerNode != nil {
		t.Errorf("MemoryPerNode = %v, want nil", req.MemoryPerNode)
	}
	if req.MemoryPerCpu != nil {
		t.Errorf("MemoryPerCpu = %v, want nil", req.MemoryPerCpu)
	}
	if req.TimeLimit != nil {
		t.Errorf("TimeLimit = %v, want nil", req.TimeLimit)
	}
	if req.QOS != nil {
		t.Errorf("QOS = %v, want nil", req.QOS)
	}
	if req.Nodes != nil {
		t.Errorf("Nodes = %v, want nil", req.Nodes)
	}
	if req.Tasks != nil {
		t.Errorf("Tasks = %v, want nil", req.Tasks)
	}
	if req.Requeue != nil {
		t.Errorf("Requeue = %v, want nil", req.Requeue)
	}
	if req.KillOnNodeFail != nil {
		t.Errorf("KillOnNodeFail = %v, want nil", req.KillOnNodeFail)
	}
}

func assertString(t *testing.T, m map[string]interface{}, key, want string) {
	t.Helper()
	got, ok := m[key].(string)
	if !ok {
		t.Errorf("%s: not a string, got %T", key, m[key])
		return
	}
	if got != want {
		t.Errorf("%s = %q, want %q", key, got, want)
	}
}

func assertFloat64(t *testing.T, m map[string]interface{}, key string, want float64) {
	t.Helper()
	got, ok := m[key].(float64)
	if !ok {
		t.Errorf("%s: not a float64, got %T", key, m[key])
		return
	}
	if got != want {
		t.Errorf("%s = %v, want %v", key, got, want)
	}
}

func assertBool(t *testing.T, m map[string]interface{}, key string, want bool) {
	t.Helper()
	got, ok := m[key].(bool)
	if !ok {
		t.Errorf("%s: not a bool, got %T", key, m[key])
		return
	}
	if got != want {
		t.Errorf("%s = %v, want %v", key, got, want)
	}
}

func assertPtrString(t *testing.T, got *string, want string) {
	t.Helper()
	if got == nil {
		t.Errorf("got nil, want %q", want)
		return
	}
	if *got != want {
		t.Errorf("got %q, want %q", *got, want)
	}
}

func assertPtrInt32(t *testing.T, got *int32, want int32) {
	t.Helper()
	if got == nil {
		t.Errorf("got nil, want %d", want)
		return
	}
	if *got != want {
		t.Errorf("got %d, want %d", *got, want)
	}
}

func assertPtrInt64(t *testing.T, got *int64, want int64) {
	t.Helper()
	if got == nil {
		t.Errorf("got nil, want %d", want)
		return
	}
	if *got != want {
		t.Errorf("got %d, want %d", *got, want)
	}
}

func assertPtrBool(t *testing.T, got *bool, want bool) {
	t.Helper()
	if got == nil {
		t.Errorf("got nil, want %v", want)
		return
	}
	if *got != want {
		t.Errorf("got %v, want %v", *got, want)
	}
}