package api

import (
	"bytes"
	"database/sql"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"work-queue-api/internal/db"
)

func newTestServer(t *testing.T) (*Server, *sql.DB) {
	t.Helper()
	sqliteDB, err := db.Open(t.TempDir() + "/test.db")
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	server, err := NewServer(sqliteDB)
	if err != nil {
		t.Fatalf("new server: %v", err)
	}
	return server, sqliteDB
}

func doJSON(t *testing.T, h http.Handler, method, path string, body any) *httptest.ResponseRecorder {
	t.Helper()
	var payload []byte
	if body != nil {
		var err error
		payload, err = json.Marshal(body)
		if err != nil {
			t.Fatalf("marshal body: %v", err)
		}
	}
	req := httptest.NewRequest(method, path, bytes.NewReader(payload))
	res := httptest.NewRecorder()
	h.ServeHTTP(res, req)
	return res
}

func TestProjectAndWorkLifecycle(t *testing.T) {
	server, sqliteDB := newTestServer(t)
	defer sqliteDB.Close()
	router := server.Router()

	projectRes := doJSON(t, router, http.MethodPost, "/projects", map[string]any{
		"name":         "Shopping List API",
		"external_ref": "todoist:123",
	})
	if projectRes.Code != http.StatusCreated {
		t.Fatalf("create project status = %d body=%s", projectRes.Code, projectRes.Body.String())
	}
	var project map[string]any
	if err := json.Unmarshal(projectRes.Body.Bytes(), &project); err != nil {
		t.Fatalf("decode project: %v", err)
	}

	workRes := doJSON(t, router, http.MethodPost, "/work", map[string]any{
		"project_id":     project["id"],
		"type":           "code_review",
		"description":    "Review PR #3",
		"payload":        map[string]any{"pr": 3},
		"priority":       2,
		"assigned_agent": "steve-w",
		"created_by":     "marcus-a",
	})
	if workRes.Code != http.StatusCreated {
		t.Fatalf("create work status = %d body=%s", workRes.Code, workRes.Body.String())
	}
	var work map[string]any
	if err := json.Unmarshal(workRes.Body.Bytes(), &work); err != nil {
		t.Fatalf("decode work: %v", err)
	}

	for _, step := range []map[string]any{
		{"status": "dispatched", "assigned_agent": "steve-w"},
		{"status": "in_progress"},
		{"status": "completed", "outcome": "success", "notes": "done"},
	} {
		res := doJSON(t, router, http.MethodPatch, "/work/"+work["id"].(string), step)
		if res.Code != http.StatusOK {
			t.Fatalf("patch work step=%v status = %d body=%s", step, res.Code, res.Body.String())
		}
	}

	getRes := doJSON(t, router, http.MethodGet, "/work/"+work["id"].(string), nil)
	if getRes.Code != http.StatusOK {
		t.Fatalf("get work status = %d body=%s", getRes.Code, getRes.Body.String())
	}
	var fetched map[string]any
	if err := json.Unmarshal(getRes.Body.Bytes(), &fetched); err != nil {
		t.Fatalf("decode fetched work: %v", err)
	}
	if fetched["status"] != "completed" {
		t.Fatalf("expected completed status, got %v", fetched["status"])
	}
	logs, ok := fetched["dispatch_log"].([]any)
	if !ok || len(logs) != 1 {
		t.Fatalf("expected 1 dispatch log, got %v", fetched["dispatch_log"])
	}
}

func TestOneInProgressPerAgent(t *testing.T) {
	server, sqliteDB := newTestServer(t)
	defer sqliteDB.Close()
	router := server.Router()

	create := func(desc string) string {
		res := doJSON(t, router, http.MethodPost, "/work", map[string]any{
			"type":           "bug_fix",
			"description":    desc,
			"assigned_agent": "steve-w",
		})
		if res.Code != http.StatusCreated {
			t.Fatalf("create work status = %d body=%s", res.Code, res.Body.String())
		}
		var body map[string]any
		_ = json.Unmarshal(res.Body.Bytes(), &body)
		return body["id"].(string)
	}

	first := create("first")
	second := create("second")
	for _, id := range []string{first, second} {
		res := doJSON(t, router, http.MethodPatch, "/work/"+id, map[string]any{"status": "dispatched", "assigned_agent": "steve-w"})
		if res.Code != http.StatusOK {
			t.Fatalf("dispatch status = %d body=%s", res.Code, res.Body.String())
		}
	}
	res := doJSON(t, router, http.MethodPatch, "/work/"+first, map[string]any{"status": "in_progress"})
	if res.Code != http.StatusOK {
		t.Fatalf("first in progress status = %d body=%s", res.Code, res.Body.String())
	}
	res = doJSON(t, router, http.MethodPatch, "/work/"+second, map[string]any{"status": "in_progress"})
	if res.Code != http.StatusConflict {
		t.Fatalf("expected 409, got %d body=%s", res.Code, res.Body.String())
	}
}