package slurm

import (
	"context"
	"fmt"
	"net/http"
	"net/http/httptest"
	"net/url"
	"strings"
	"testing"
)

func testMethod(t *testing.T, r *http.Request, expected string) {
	t.Helper()
	if r.Method != expected {
		t.Errorf("expected method %s, got %s", expected, r.Method)
	}
}

func TestJobsService_GetJobs(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/jobs", func(w http.ResponseWriter, r *http.Request) {
		testMethod(t, r, "GET")
		fmt.Fprint(w, `{"jobs": [], "last_backfill": {}, "last_update": {}}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	resp, _, err := client.Jobs.GetJobs(context.Background(), nil)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if resp == nil {
		t.Fatal("expected non-nil response")
	}
	if len(resp.Jobs) != 0 {
		t.Errorf("expected empty jobs, got %d", len(resp.Jobs))
	}
}

func TestJobsService_GetJobs_WithOptions(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/jobs", func(w http.ResponseWriter, r *http.Request) {
		testMethod(t, r, "GET")
		q := r.URL.Query()
		if q.Get("update_time") != "12345" {
			t.Errorf("expected update_time=12345, got %s", q.Get("update_time"))
		}
		if q.Get("flags") != JobFlagDetail {
			t.Errorf("expected flags=%s, got %s", JobFlagDetail, q.Get("flags"))
		}
		fmt.Fprint(w, `{"jobs": [], "last_update": {}}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	opts := &GetJobsOptions{
		UpdateTime: Ptr("12345"),
		Flags:      Ptr(JobFlagDetail),
	}
	resp, _, err := client.Jobs.GetJobs(context.Background(), opts)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if resp == nil {
		t.Fatal("expected non-nil response")
	}
}

func TestJobsService_GetJob(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/job/42", func(w http.ResponseWriter, r *http.Request) {
		testMethod(t, r, "GET")
		fmt.Fprint(w, `{"jobs": [{"job_id": 42, "name": "test-job"}], "last_update": {}}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	resp, _, err := client.Jobs.GetJob(context.Background(), "42", nil)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if resp == nil {
		t.Fatal("expected non-nil response")
	}
	if len(resp.Jobs) != 1 {
		t.Fatalf("expected 1 job, got %d", len(resp.Jobs))
	}
	if resp.Jobs[0].JobID == nil || *resp.Jobs[0].JobID != 42 {
		t.Errorf("expected job_id=42, got %v", resp.Jobs[0].JobID)
	}
}

func TestJobsService_PostJob(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/job/42", func(w http.ResponseWriter, r *http.Request) {
		testMethod(t, r, "POST")
		if ct := r.Header.Get("Content-Type"); ct != "application/json" {
			t.Errorf("expected Content-Type application/json, got %s", ct)
		}
		fmt.Fprint(w, `{"job_id": "42", "step_id": "0", "results": []}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	desc := &JobDescMsg{
		Name: Ptr("updated-job"),
	}
	resp, _, err := client.Jobs.PostJob(context.Background(), "42", desc)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if resp == nil {
		t.Fatal("expected non-nil response")
	}
	if resp.JobID == nil || *resp.JobID != "42" {
		t.Errorf("expected job_id=42, got %v", resp.JobID)
	}
}

func TestJobsService_DeleteJob(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/job/42", func(w http.ResponseWriter, r *http.Request) {
		testMethod(t, r, "DELETE")
		q := r.URL.Query()
		if q.Get("signal") != "SIGTERM" {
			t.Errorf("expected signal=SIGTERM, got %s", q.Get("signal"))
		}
		fmt.Fprint(w, `{}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	opts := &DeleteJobOptions{
		Signal: Ptr("SIGTERM"),
	}
	resp, _, err := client.Jobs.DeleteJob(context.Background(), "42", opts)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if resp == nil {
		t.Fatal("expected non-nil response")
	}
}

func TestJobsService_SubmitJob(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/job/submit", func(w http.ResponseWriter, r *http.Request) {
		testMethod(t, r, "POST")
		if ct := r.Header.Get("Content-Type"); ct != "application/json" {
			t.Errorf("expected Content-Type application/json, got %s", ct)
		}
		fmt.Fprint(w, `{"job_id": 100, "step_id": "0", "result": {"job_id": 100, "step_id": "0"}}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	reqBody := &JobSubmitReq{
		Script: Ptr("#!/bin/bash\necho hello"),
		Job: &JobDescMsg{
			Name: Ptr("test-submit"),
		},
	}
	resp, _, err := client.Jobs.SubmitJob(context.Background(), reqBody)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if resp == nil {
		t.Fatal("expected non-nil response")
	}
	if resp.JobID == nil || *resp.JobID != 100 {
		t.Errorf("expected job_id=100, got %v", resp.JobID)
	}
}

func TestJobsService_GetJobs_Error(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/jobs", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusInternalServerError)
		fmt.Fprint(w, `{"errors": [{"error": "internal error"}]}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	_, _, err := client.Jobs.GetJobs(context.Background(), nil)
	if err == nil {
		t.Fatal("expected error for 500 response")
	}
	if !strings.Contains(err.Error(), "500") {
		t.Errorf("expected error to contain 500, got %v", err)
	}
}

func TestJobsService_GetJob_Error(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/job/999", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNotFound)
		fmt.Fprint(w, `{"errors": [{"error": "job not found"}]}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	_, _, err := client.Jobs.GetJob(context.Background(), "999", nil)
	if err == nil {
		t.Fatal("expected error for 404 response")
	}
}

func TestJobsService_DeleteJob_NoOptions(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/job/42", func(w http.ResponseWriter, r *http.Request) {
		testMethod(t, r, "DELETE")
		q := r.URL.Query()
		if len(q) != 0 {
			t.Errorf("expected no query params, got %v", q)
		}
		fmt.Fprint(w, `{}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	resp, _, err := client.Jobs.DeleteJob(context.Background(), "42", nil)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if resp == nil {
		t.Fatal("expected non-nil response")
	}
}

func TestJobsService_GetJobPathEscaping(t *testing.T) {
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/job/", func(w http.ResponseWriter, r *http.Request) {
		testMethod(t, r, "GET")
		parts := strings.Split(r.URL.Path, "/")
		jobID := parts[len(parts)-1]
		if jobID != "123" {
			t.Errorf("expected job ID 123, got %s", jobID)
		}
		fmt.Fprint(w, `{"jobs": [{"job_id": 123}]}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	resp, _, err := client.Jobs.GetJob(context.Background(), "123", nil)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if resp == nil {
		t.Fatal("expected non-nil response")
	}
}

func TestJobsService_GetJobsWithURLQuery(t *testing.T) {
	var capturedQuery url.Values
	mux := http.NewServeMux()
	mux.HandleFunc("/slurm/v0.0.40/jobs", func(w http.ResponseWriter, r *http.Request) {
		capturedQuery = r.URL.Query()
		testMethod(t, r, "GET")
		fmt.Fprint(w, `{"jobs": []}`)
	})
	server := httptest.NewServer(mux)
	defer server.Close()

	client, _ := NewClient(server.URL, nil)
	opts := &GetJobsOptions{
		UpdateTime: Ptr("1700000000"),
	}
	_, _, err := client.Jobs.GetJobs(context.Background(), opts)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if capturedQuery.Get("update_time") != "1700000000" {
		t.Errorf("expected update_time=1700000000, got %s", capturedQuery.Get("update_time"))
	}
}